{"id":68083,"date":"2026-11-10T10:11:37","date_gmt":"2026-11-10T04:41:37","guid":{"rendered":"https:\/\/johnsonfrancis.org\/professional\/?p=68083"},"modified":"2026-11-10T10:46:32","modified_gmt":"2026-11-10T05:16:32","slug":"interactive-cardiology-mcqs-34-congenital-heart-disease","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/interactive-cardiology-mcqs-34-congenital-heart-disease\/","title":{"rendered":"Interactive Cardiology MCQs 34: Congenital Heart Disease\u00a0"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<!-- Cardiology MCQs Part 34 (Full 25 Questions - Congenital Heart Disease) - WordPress Safe Custom HTML Block -->\n<script src=\"https:\/\/cdn.tailwindcss.com?plugins=forms,typography,aspect-ratio\"><\/script>\n<script>\n  tailwind.config = { corePlugins: { preflight: false } }\n<\/script>\n\n<div id=\"mcq34-quiz-wrapper\" class=\"font-sans bg-slate-950 text-slate-100 p-4 md:p-8 rounded-3xl max-w-4xl mx-auto shadow-2xl relative overflow-hidden my-8 border border-solid border-cyan-500\/20\" style=\"box-sizing: border-box;\">\n  \n  <div class=\"absolute top-0 left-0 w-full h-full pointer-events-none opacity-10 bg-[radial-gradient(ellipse_at_center,_var(--tw-gradient-stops))] from-cyan-500 via-blue-900 to-slate-950\"><\/div>\n  \n  <div class=\"relative text-center pb-6 border-b border-solid border-cyan-500\/25 mb-8\">\n    <div class=\"inline-block bg-gradient-to-r from-cyan-500 via-blue-600 to-indigo-600 text-white font-black text-xs md:text-sm px-4 py-1.5 rounded-full uppercase tracking-wider shadow-lg mb-3 animate-pulse\">\n      \u26a1 Advanced Cardiology Series &#8211; Part 34\n    <\/div>\n    <h1 class=\"text-3xl md:text-5xl font-extrabold tracking-tight text-transparent bg-clip-text bg-gradient-to-r from-cyan-300 via-blue-400 to-indigo-400 m-0\">\n      Interactive Cardiology MCQs #34\n    <\/h1>\n    <p class=\"text-sm md:text-lg text-slate-300 mt-2 max-w-2xl mx-auto font-medium\">\n      Post-Graduate Level Masterclass: Adult Congenital Heart Disease (ACHD)\n    <\/p>\n  <\/div>\n\n  <div class=\"sticky top-4 z-40 bg-slate-900\/90 backdrop-blur-md border-2 border-solid border-cyan-500\/40 rounded-2xl p-4 mb-8 shadow-xl flex flex-wrap items-center justify-between gap-4\">\n    <div class=\"flex items-center gap-3\">\n      <div class=\"text-3xl\">\ud83e\udec0<\/div>\n      <div>\n        <div class=\"text-[10px] uppercase font-extrabold tracking-widest text-cyan-300\">Live Scoreboard<\/div>\n        <div class=\"text-lg md:text-2xl font-black text-blue-300 flex items-center gap-1\">\n          <span id=\"mcq34-correct-count\">0<\/span><span class=\"text-slate-500 text-sm md:text-lg\">\/ 25 Correct<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n    <div class=\"flex items-center gap-2 bg-slate-950\/80 px-4 py-2 rounded-xl border border-solid border-slate-800\">\n      <span class=\"text-xs font-bold text-slate-400 uppercase tracking-wider\">Progress:<\/span>\n      <div class=\"w-24 md:w-36 bg-slate-800 h-3 rounded-full overflow-hidden\">\n        <div id=\"mcq34-progress-bar\" class=\"bg-gradient-to-r from-cyan-500 to-blue-500 h-full w-0 transition-all duration-300 rounded-full\"><\/div>\n      <\/div>\n      <span class=\"text-xs font-bold text-blue-300\"><span id=\"mcq34-answered-count\">0<\/span>\/25<\/span>\n    <\/div>\n  <\/div>\n\n  <div class=\"space-y-8 relative\">\n\n    <!-- Q1 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q1<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          According to ACC\/AHA guidelines for the management of adults with congenital heart disease (ACHD), what is the primary hemodynamic threshold that mandates closure of an isolated Atrial Septal Defect (ASD) secondum type in the absence of severe irreversible pulmonary hypertension?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"A Qp\/Qs of 1.0 indicates no shunt; closure is not indicated for a balanced non-shunting septum.\">A) A pulmonary-to-systemic blood flow ratio (Qp\/Qs) greater than or equal to 1.0:1.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Guideline-directed closure of an secundum ASD is indicated when there is evidence of right atrial and right ventricular volume overload (even if the patient is asymptomatic), provided the Qp\/Qs ratio is greater than or equal to 1.5:1. Significant left-to-right shunting leads over time to RV failure, tricuspid regurgitation, atrial arrhythmias, and pulmonary vascular disease. Reference: ACC\/AHA ACHD Guidelines.\">B) A pulmonary-to-systemic blood flow ratio (Qp\/Qs) greater than or equal to 1.5:1 with evidence of RV volume overload.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"A ratio of 2.0:1 represents an extremely large shunt, but closure is recommended at lower thresholds (1.5:1) once RV volume overload is present.\">C) A Qp\/Qs ratio strictly greater than 2.0:1 combined with systemic oxygen desaturation.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"An ASD should be closed prior to the development of Eisenmenger physiology; closing a shunt once severe pulmonary vascular resistance causes right-to-left reversal is contraindicated.\">D) The presence of severe Eisenmenger physiology with balanced bidirectional shunting.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q2 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q2<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          A 32-year-old female with an unrepaired secundum ASD presents with progressive dyspnea and cyanosis. Cardiac catheterization reveals pulmonary arterial pressure of 95 mmHg and pulmonary vascular resistance (PVR) of 11 Wood units, with net right-to-left shunting. What is this clinical syndrome called, and is device closure advised?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Lutembacher syndrome is the combination of mitral stenosis and an atrial septal defect.\">A) Lutembacher Syndrome; immediate surgical closure is mandatory to relieve left atrial pressure.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"This represents Eisenmenger Syndrome. Long-standing left-to-right shunting causes irreversible pulmonary vascular obstructive disease, raising PVR above systemic levels and reversing the shunt. Closure of the defect is strictly CONTRAINDICATED because the ASD acts as a 'pop-off valve' for the failing right ventricle; closing it causes acute RV failure and sudden death. Treatment relies on advanced PAH targeted medical therapies. Reference: ESC\/ACC Guidelines on ACHD.\">B) Eisenmenger Syndrome; shunt closure is strictly contraindicated as it will precipitate acute right heart failure and death.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Holt-Oram syndrome involves hand-heart anomalies, not pure pulmonary vascular reversal.\">C) Holt-Oram Syndrome; urgent device closure combined with thumb reconstruction is indicated.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"While pulmonary hypertension is present, standard vasodilator monotherapy without considering the Eisenmenger physiology is incomplete; closure is definitely contraindicated.\">D) Idiopathic Pulmonary Arterial Hypertension; treat with pulmonary vasodilator therapy and proceed with elective ASD closure.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q3 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q3<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Which anatomical type of Atrial Septal Defect is most commonly associated with a cleft mitral valve and a significant risk of early-onset mitral regurgitation?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Secundum ASD is located in the fossa ovalis and is not associated with AV valve clefts.\">A) Secundum ASD.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Primum ASD is a partial AV septal defect, but sinus venosus defects are located near the SVC\/IVC junctions.\">B) Sinus Venosus ASD (Superior type).<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"An Atrioventricular Septal Defect (AVSD), specifically partial AVSD (often historically called a 'Primum ASD'), involves abnormal endocardial cushion development. It is classically associated with a cleft in the anterior mitral valve leaflet, leading to mitral regurgitation, and a defect situated low in the atrial septum immediately above the AV valves. Reference: Moss and Adams' Heart Disease in Infants, Children, and Adolescents.\">C) Primum ASD (Partial Atrioventricular Septal Defect).<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Coronary sinus defects are rare defects involving the unroofing of the coronary sinus wall.\">D) Coronary Sinus Defect.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q4 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q4<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Which congenital cardiac anomaly is classically associated with Scimitar syndrome (hypogenetic lung syndrome)?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Tetralogy of Fallot is characterized by RVOTO, VSD, overriding aorta, and RV hypertrophy, not anomalous venous drainage.\">A) Tetralogy of Fallot with absent pulmonary valve.&#8221;>Tetralogy of Fallot.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Scimitar syndrome is a rare congenital anomaly characterized by anomalous partial or total pulmonary venous return from the right lung directly into the inferior vena cava. On chest radiography, the anomalous draining vein casts a Turkish sword ('scimitar') shaped shadow along the right cardiac border. It is frequently associated with right lung hypoplasia and dextroposition of the heart. Reference: ACC\/AHA ACHD Guidelines.\">B) Partial Anomalous Pulmonary Venous Return (PAPVR) of the right lung into the IVC.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"TAPVR involves all pulmonary veins draining into systemic venous structures, typically via a supracardiac, cardiac, or infracardiac route, but not specifically the Scimitar appearance.\">C) Total Anomalous Pulmonary Venous Return (TAPVR) to the coronary sinus.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Ebstein anomaly involves apical displacement of the tricuspid valve leaflets, leading to 'atrialized' RV.\">D) Ebstein Anomaly of the Tricuspid Valve.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q5 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q5<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          A patient presents with a continuous &#8216;machinery&#8217; murmur best heard at the left upper sternal border, bounding peripheral pulses, and a wide pulse pressure. What is the standard guideline recommendation for an isolated Patent Ductus Arteriosus (PDA) in an adult with left heart volume overload?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Leaving a PDA open when volume overload is present risks progressive LV dilation, heart failure, and pulmonary endarteritis.\">A) Conservative management with serial echocardiography, as adult PDAs rarely cause complications.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Closure of a PDA is recommended for all adult patients with left-to-right shunting who demonstrate evidence of left atrial or left ventricular volume overload, or pulmonary hypertension, provided Eisenmenger physiology is absent. Transcatheter coil or plug closure is currently the treatment of choice over open surgical ligation. Reference: ACC\/AHA Guidelines for the Management of Adults with Congenital Heart Disease.\">B) Percutaneous transcatheter closure (or surgical ligation) to prevent LV volume overload, heart failure, and endarteritis.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Indomethacin and NSAIDs promote ductal closure in premature neonates by inhibiting prostaglandins, but they are entirely ineffective for closing a patent ductus arteriosus in adults.\">C) Administration of high-dose oral Indomethacin or Ibuprofen to stimulate smooth muscle contraction.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Prophylactic antibiotics are no longer broadly recommended solely for endocarditis prevention in unrepaired PDA unless there is a prior history of endocarditis.\">D) Lifelong prophylactic antibiotics to prevent infective endocarditis without any anatomical closure.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q6 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q6<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Tetralogy of Fallot (ToF) is characterized by four hallmark anatomical features. Which of the following correctly lists all four primary components?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"ASD is not part of Tetralogy of Fallot; it is a Ventricular Septal Defect (VSD).\">A) Atrial septal defect, pulmonary stenosis, overriding aorta, and right ventricular hypertrophy.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"The four classic components of Tetralogy of Fallot, resulting from anterior-cephalad malalignment of the infundibular (conal) septum, are: 1) Ventricular Septal Defect (VSD), 2) Right Ventricular Outflow Tract Obstruction (RVOTO - infundibular\/pulmonary stenosis), 3) Overriding Aorta, and 4) Right Ventricular Hypertrophy (RVH). Reference: Braunwald's Heart Disease.\">B) Ventricular septal defect, right ventricular outflow tract obstruction, overriding aorta, and right ventricular hypertrophy.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Left ventricular hypertrophy is not a primary tetrad feature; RV hypertrophy develops as a consequence of RVOTO.\">C) Ventricular septal defect, left ventricular hypertrophy, pulmonary atresia, and persistent truncus arteriosus.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Coarctation of the aorta is distinct from ToF.\">D) Coarctation of the aorta, VSD, bicuspid aortic valve, and patent ductus arteriosus.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q7 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q7<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Long-term follow-up of surgically repaired Tetralogy of Fallot patients in adulthood frequently reveals a specific chronic hemodynamic complication resulting from prior transannular patch repair or infundibulotomy. What is this primary lesion?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"While residual RVOTO can occur, chronic free pulmonary regurgitation is the hallmark long-term consequence of transannular patching.\">A) Severe residual infundibular pulmonary stenosis with suprasystemic RV pressure.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Chronic Pulmonary Regurgitation (PR) is the most frequent long-term sequela after surgical repair of ToF, particularly when a transannular patch was used to relieve RVOTO, destroying the pulmonary valve. Chronic PR leads to progressive RV volume overload, RV dilation, tricuspid regurgitation, ventricular arrhythmias, and sudden cardiac death. Timing pulmonary valve replacement (PVR) before irreversible RV dysfunction occurs is a major clinical challenge. Reference: ACC\/AHA ACHD Guidelines.\">B) Chronic Pulmonary Regurgitation leading to progressive Right Ventricular dilation and dysfunction.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Left ventricular outflow tract obstruction is not a classic complication of repaired ToF.\">C) Left Ventricular Outflow Tract Obstruction due to hypertrophied basal septum.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Mitral valve prolapse can occur, but it is not the primary defining long-term hemodynamic lesion of repaired ToF.\">D) Myxomatous degeneration of the mitral valve leading to severe mitral stenosis.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q8 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q8<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Transposition of the Great Arteries (TGA) with concordant atrioventricular and discordant ventriculoarterial connections (D-TGA) was historically repaired using an atrial baffle operation (Mustard or Senning procedure). What is the major long-term structural complication unique to patients who underwent an atrial baffle repair?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Left ventricular failure is more typical of the arterial switch operation if coronary button transfer fails, but Mustard\/Senning patients rely on the morphologic RV.\">A) Progressive failure of the systemic Left Ventricle because it pumps against low pulmonary resistance.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"In the Mustard or Senning baffle procedures, systemic venous blood is rerouted to the mitral valve (morphologic LV to pulmonary circulation), and pulmonary venous blood is rerouted to the tricuspid valve (morphologic RV to systemic circulation). Thus, the morphologic Right Ventricle acts as the systemic ventricle. Over decades, the RV fails under systemic afterload, leading to systemic RV failure, tricuspid regurgitation, and severe arrhythmias. Reference: ACC\/AHA Guidelines for ACHD.\">B) Progressive systemic Right Ventricular failure, tricuspid regurgitation, and baffle obstruction\/leaks.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Aortic coarctation is associated with Shone's complex or hypoplastic left heart syndrome, not D-TGA baffle repair.\">C) Severe supravalvular aortic coarctation at the site of the arterial switch anastomosis.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Pulmonary stenosis can occur, but systemic RV failure is the dominant, defining long-term mortality risk.\">D) Fixed subpulmonary obstruction due to excessive baffle tissue growth.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q9 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q9<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Congenitally Corrected Transposition of the Great Arteries (L-TGA or ccTGA) involves both atrioventricular and ventriculoarterial discordance. What is the defining long-term natural history risk for patients with unoperated ccTGA?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Cyanosis is absent in isolated ccTGA because the circulations are physiologically in series (though anatomically abnormal).\">A) Severe refractory cyanosis due to obligatory right-to-left shunting at the atrial level.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"In ccTGA, the right atrium connects via a mitral-like (morphologic tricuspid) valve to a morphologic LV, which pumps to the pulmonary artery. Meanwhile, the left atrium connects via a tricuspid-like (morphologic mitral) valve to a morphologic RV, which pumps to the aorta. Thus, the morphologic RV is the systemic ventricle. Complications include progressive systemic RV failure, systemic AV valve (tricuspid) regurgitation, and a high incidence of complete heart block due to an abnormally positioned conduction system. Reference: ACC\/AHA ACHD Guidelines.\">B) Progressive systemic RV failure, systemic AV valve regurgitation, and high-grade complete heart block.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Left ventricular failure is not the primary risk since the LV is supporting the low-pressure pulmonary circulation.\">C) Left ventricular failure secondary to high pulmonary vascular resistance.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Aortic dissection is classically associated with Marfan or bicuspid aortic valve aortopathy, not ccTGA.\">D) Rapidly progressive type A aortic dissection due to intrinsic cystic medial necrosis.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q10 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q10<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Ebstein Anomaly is characterized by failure of delamination of the tricuspid valve leaflets, leading to downward displacement of the septal and posterior leaflets into the right ventricle. Which electrocardiographic finding is classically associated with Ebstein anomaly and predisposes patients to paroxysmal supraventricular tachycardias?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Epsilon waves are the classic finding in Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC).\">A) Epsilon waves in leads V1 to V3.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Ebstein anomaly is uniquely associated with accessory atrioventricular pathways (Kent bundles), most commonly on the right side, leading to Wolff-Parkinson-White (WPW) pre-excitation pattern in up to 10-25 percent of patients. Other ECG hallmarks include severe right atrial enlargement ('Himalayan P waves'), incomplete RBBB, and low voltage in right precordial leads. Reference: Moss and Adams' Heart Disease.\">B) Wolff-Parkinson-White (WPW) pre-excitation pattern due to right-sided accessory pathways.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Brugada sign (coved ST elevation in V1-V3) is a channelopathy, not associated with Ebstein anomaly.\">C) Brugada coved ST-segment elevation in leads V1-V2.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Short QT interval is a distinct channelopathy syndrome.\">D) Prominent U waves and prolonged QT intervals.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q11 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q11<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Coarctation of the aorta is classically localized near the insertion of the ligamentum arteriosum. Which clinical sign is characteristic of significant aortic coarctation on physical examination?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Water-hammer pulse is characteristic of severe aortic regurgitation.\">A) Water-hammer (Corrigan) pulses with bounding carotid upstrokes and low diastolic pressure.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Coarctation of the aorta produces radio-femoral delay and lower extremity hypertension\/pulses that are significantly weaker and delayed compared to upper extremities (brachial-femoral delay). Blood pressure in the arms is markedly higher than in the legs. Other physical signs include intercostal collateral artery murmurs and rib notching on chest X-ray. Reference: ACC\/AHA ACHD Guidelines.\">B) Radio-femoral delay and significantly higher blood pressure in the upper extremities compared to the lower extremities.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Pulsus paradoxus is seen in cardiac tamponade, severe asthma, or constrictive pericarditis.\">C) Pulsus paradoxus with an inspiratory drop in systolic blood pressure greater than 20 mmHg.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Pulsus bisferiens is seen in hypertrophic cardiomyopathy or combined aortic stenosis and regurgitation.\">D) Pulsus bisferiens with a dual systolic peak in both upper and lower limb arterial traces.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q12 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q12<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          A 24-year-old male with Turner syndrome is evaluated for cardiovascular abnormalities. Beyond bicuspid aortic valve, what is the most critical life-threatening cardiovascular aortopathy associated with Turner syndrome?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Atherosclerotic coronary artery disease typically presents in older adults with traditional risk factors, not young adults with Turner syndrome.\">A) Premature atherosclerotic coronary artery disease and multivessel myocardial infarction.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Turner syndrome (45,X) carries a dramatically increased risk of congenital cardiovascular malformations, most notably bicuspid aortic valve (up to 15-30%) and coarctation of the aorta. Furthermore, these patients have an intrinsic aortopathy predisposing them to progressive aortic root dilation and acute Type A Aortic Dissection, often occurring at younger ages and smaller aortic diameters than in Marfan syndrome. Reference: ACC\/AHA ACHD Guidelines.\">B) Progressive aortic root dilation, ascending aortic aneurysm, and acute Aortic Dissection.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Pulmonary arterial hypertension can occur in congenital heart disease with left-to-right shunts, but aortopathy\/dissection is the hallmark specific aortic risk in Turner syndrome.\">C) Severe idiopathic pulmonary arterial hypertension with plexogenic arteriopathy.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Myxomatous mitral valve prolapse is classically associated with Marfan syndrome or Ehlers-Danlos syndrome.\">D) Myxomatous degeneration of the mitral valve leading to severe flail leaflet and acute pulmonary edema.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q13 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q13<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Marfan syndrome is an autosomal dominant connective tissue disorder caused by mutations in the FBN1 gene (fibrillin-1). What is the primary cardiovascular indication for elective surgical replacement of the aortic root in Marfan syndrome?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Waiting until 6.0 cm is extremely dangerous and exceeds current guideline thresholds, risking catastrophic dissection or rupture.\">A) An absolute aortic root diameter exceeding 6.0 cm regardless of family history or rate of growth.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"According to ACC\/AHA guidelines, prophylactic surgical repair of the aortic root\/ascending aorta in Marfan syndrome is indicated when the maximal aortic diameter reaches or exceeds 5.0 cm. Surgery is also indicated at lower thresholds (greater than or equal to 4.5 cm) if there is a family history of aortic dissection, rapid aortic growth (greater than 0.3 cm\/year), or severe aortic\/mitral regurgitation. Reference: ACC\/AHA Guidelines for Aortic Disease.\">B) An aortic root diameter greater than or equal to 5.0 cm, or greater than or equal to 4.5 cm with rapid growth or family history of dissection.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Prophylactic surgery is performed before dissection occurs to prevent mortality.\">C) Occurrence of an acute uncomplicated Type B aortic dissection managed medically.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Mild aortic root enlargement (e.g., 3.8 cm) is managed medically with beta-blockers or ARBs, not immediate surgical root replacement.\">D) Documented aortic root diameter of 3.8 cm combined with mild systemic hypertension.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q14 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q14<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Patients with Cyanotic Congenital Heart Disease (e.g., unrepaired Tetralogy of Fallot or Eisenmenger syndrome) frequently develop secondary erythrocytosis (polycythemia) as a physiological adaptation to chronic hypoxemia. What is the fundamental guideline recommendation regarding routine therapeutic phlebotomy in these patients?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Routine prophylactic phlebotomy depletes iron stores, leading to microcytosis where rigid, poorly deformable red blood cells actually worsen blood viscosity and tissue oxygen delivery.\">A) Routine prophylactic phlebotomy should be performed monthly to keep hematocrit strictly below 45 percent.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Secondary erythrocytosis is a beneficial compensatory response to maintain oxygen-carrying capacity in cyanotic patients. Routine prophylactic phlebotomy is strongly discouraged because it does not reduce stroke risk, depletes iron stores (causing microcytosis and increasing whole-blood hyperviscosity), and can induce acute hypovolemia. Phlebotomy is reserved strictly for patients with severe hyperviscosity symptoms (headache, visual disturbances) and a hematocrit greater than 65 percent, accompanied by volume replacement. Reference: ACC\/AHA ACHD Guidelines.\">B) Routine phlebotomy is contraindicated; it should only be performed for severe hyperviscosity symptoms when hematocrit exceeds 65 percent.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Iron supplementation is often required in cyanotic patients who develop iron deficiency due to phlebotomy or bleeding, but routine phlebotomy itself is not standard.\">C) Phlebotomy should be combined with daily oral iron supplementation to stimulate normal erythropoiesis.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Warfarin is not routinely indicated solely for elevated hematocrit without a documented thrombotic or arrhythmic indication, due to bleeding risks.\">D) Therapeutic phlebotomy must be immediately followed by full-dose therapeutic anticoagulation with warfarin.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q15 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q15<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Pregnancy in women with congenital heart disease carries varying degrees of maternal risk, classified using the World Health Organization (WHO) risk stratification framework. Which of the following conditions is classified as WHO Risk IV (Pregnancy Contraindicated)?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Small, repaired secundum ASD without pulmonary hypertension is WHO Risk I (negligible risk).\">A) Small, successfully repaired secundum atrial septal defect with normal RV size and function.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Mild native aortic stenosis or repaired coarctation is generally WHO Risk II or II-III.\">B) Mild congenital aortic stenosis with a peak gradient less than 30 mmHg and normal LV function.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Pulmonary Arterial Hypertension (PAH) of any etiology, including Eisenmenger syndrome, carries an extremely high maternal mortality rate (30-50%), typically occurring around the peripartum period. Therefore, PAH\/Eisenmenger syndrome is classified as WHO Risk IV, meaning pregnancy is strictly contraindicated, and termination is strongly advised if pregnancy occurs. Reference: ESC Guidelines on Cardiovascular Diseases During Pregnancy.\">C) Pulmonary Arterial Hypertension of any etiology (including Eisenmenger syndrome).<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Marfan syndrome with an aortic root diameter under 40 mm without other risk factors is typically classified as WHO Risk II-III.\">D) Marfan syndrome with an aortic root diameter of 38 mm without family history of dissection.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q16 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q16<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          A 28-year-old male with a history of surgically repaired coarctation of the aorta in childhood presents for routine ACHD evaluation. His office blood pressure is 155\/90 mmHg in the right arm. What is the recommended initial diagnostic test to evaluate for recurrent (residual) coarctation or pseudoaneurysm formation at the repair site?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Routine invasive cardiac catheterization is not the initial imaging modality of choice for screening repaired coarctation due to radiation and vascular access risks.\">A) Immediate diagnostic invasive cardiac catheterization with simultaneous pressure pullback.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Cardiovascular Magnetic Resonance (CMR) imaging or CT angiography (CTA) are the gold standard imaging modalities for evaluating the thoracic aorta, aortic arch anatomy, recoarctation, and pseudoaneurysm formation at prior surgical repair sites. Transthoracic echocardiography is useful as a screening tool, but Doppler visualization of the distal arch and descending aorta can be limited in adults, making CMR\/CTA the definitive diagnostic choice. Reference: ACC\/AHA ACHD Guidelines.\">B) Cardiovascular Magnetic Resonance (CMR) imaging or CT Angiography of the thoracic aorta.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Cardiolite SPECT imaging evaluates myocardial perfusion, not aortic arch morphology or recoarctation.\">C) Technetium-99m sestamibi myocardial perfusion stress SPECT imaging.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Routine exercise treadmill testing evaluates functional capacity and exercise hypertension, but does not visualize anatomical recoarctation.\">D) Maximal symptom-limited exercise treadmill testing with ECG monitoring.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q17 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q17<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Fontan circulation is a palliative surgical procedure utilized for patients with single ventricle physiology (e.g., hypoplastic left heart syndrome, tricuspid atresia). What is the fundamental hemodynamic characteristic of a Fontan circulation?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"There is no subpulmonary ventricle in a Fontan circuit; systemic venous return flows passively directly into the pulmonary arteries.\">A) Systemic venous return is pumped directly into the pulmonary arteries by a hypoplastic subpulmonary ventricle.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"In a Fontan operation, systemic venous return is completely rerouted directly to the pulmonary arteries (via an extracardiac conduit or lateral tunnel) without passing through a subpulmonary ventricle. Consequently, pulmonary blood flow relies entirely on a passive non-pulsatile transpulmonary pressure gradient driven by central venous pressure and respiratory muscle action. This results in chronically elevated systemic venous pressure and unique long-term complications like Fontan-associated liver disease and protein-losing enteropathy. Reference: ACC\/AHA ACHD Guidelines.\">B) Systemic venous return flows passively directly into the pulmonary arteries without a subpulmonary ventricle.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"A Fontan circuit completely separates pulmonary and systemic venous blood, eliminating cyanosis.\">C) Complete mixing of oxygenated and deoxygenated blood within the single ventricle, resulting in fixed cyanosis.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Pulmonary vascular resistance must be low for a Fontan circulation to function; high PVR leads to Fontan failure.\">D) Highly pulsatile pulmonary arterial pressure exceeding systemic arterial pressure due to fixed pulmonary vascular disease.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q18 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q18<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          A patient with a Fontan circulation presents with chronic peripheral edema, severe hypoalbuminemia, ascites, and chronic diarrhea. What is this classic protein-losing enteropathy (PLE) syndrome primarily driven by?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"While liver congestion occurs, PLE is an enteric loss of lymph, not primary hepatic synthetic failure.\">A) Primary hepatocellular necrosis and cirrhosis leading to impaired synthesis of albumin and clotting factors.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Protein-Losing Enteropathy (PLE) in Fontan patients is driven by chronically elevated systemic venous and lymphatic pressures. This high pressure causes lymphangiectasia and weeping of protein-rich lymph directly into the intestinal lumen, leading to profound hypoalbuminemia, edema, and immunodeficiency. It represents a major, high-mortality complication of failing Fontan physiology. Reference: ACC\/AHA ACHD Guidelines.\">B) Chronically elevated central venous pressure causing intestinal lymphangiectasia and weeping of lymph into the bowel.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Glomerular nephrotic syndrome can occur, but PLE specifically involves enteric protein loss.\">C) Immune-complex glomerulonephritis leading to massive proteinuria and nephrotic syndrome.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Crohn's disease is an autoimmune bowel disorder, whereas Fontan PLE is purely hemodynamic.\">D) Concomitant autoimmune Crohn&#8217;s disease triggered by immunosuppression.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q19 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q19<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Sinus Valsalva Aneurysms are congenital or acquired dilations of the aortic sinuses. When a Sinus of Valsalva aneurysm ruptures, into which cardiac chamber or space does it most commonly rupture, producing a continuous murmur and acute heart failure?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Rupture into the left atrium is rare because the right and non-coronary sinuses sit adjacent to right-sided chambers.\">A) Left Atrium.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Sinus of Valsalva aneurysms most frequently arise from the right coronary sinus (followed by the non-coronary sinus). When they rupture, they typically fistulize into low-pressure right-sided heart chambers\u2014most commonly the Right Ventricle (if originating from the right coronary sinus) or the Right Atrium (if originating from the non-coronary sinus). This creates an acute left-to-right shunt characterized by a loud continuous murmur and volume overload. Reference: Braunwald's Heart Disease.\">B) Right Ventricle or Right Atrium.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Rupture into the pulmonary artery trunk is anatomically less common than into the RV\/RA.\">C) Main Pulmonary Artery trunk.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Rupture into the pericardial space causes acute cardiac tamponade rather than a continuous shunt murmur.\">D) Pericardial space, resulting in acute cardiac tamponade.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q20 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q20<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Anomalous Origin of the Left Coronary Artery from the Pulmonary Artery (ALCAPA \/ Bland-Garland-White syndrome) typically presents in infancy when pulmonary vascular resistance drops. However, some patients present in adulthood. What collateral circulation pattern allows these adult survivors to reach adulthood?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Aortopulmonary collaterals occur in pulmonary atresia, not ALCAPA.\">A) Massive aortopulmonary collateral arteries arising directly from the descending thoracic aorta.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"In ALCAPA, the left coronary artery arises from the pulmonary artery instead of the aorta. Adult survivors develop extensive intercoronary collateral vessels between the right coronary artery (RCA) and the left coronary artery (LCA). Blood flows anterograde from the aorta into the RCA, through the collaterals into the LCA, and then drains retrogradely into the low-pressure pulmonary artery (coronary steal phenomenon). Surgical reimplantation into the aorta is mandatory. Reference: ACC\/AHA ACHD Guidelines.\">B) Extensive intercoronary collaterals from a dominant Right Coronary Artery feeding the LCA with retrograde flow into the pulmonary artery.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Patent ductus arteriosus supplies the systemic circulation in duct-dependent lesions, not ALCAPA.\">C) A large Patent Ductus Arteriosus supplying systemic arterial blood directly to the left main stem.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Thebesian veins are tiny myocardial sinusoids, not the primary large collaterals sustaining adult ALCAPA patients.\">D) Hypertrophied Thebesian veins providing direct trans-myocardial sinusoids from the left ventricular cavity.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q21 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q21<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Persistent Left Superior Vena Cava (PLSVC) is the most common congenital thoracic venous anomaly. Into which cardiac structure does an isolated PLSVC typically drain?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"TAPVR can drain into the left atrium, but PLSVC has a distinct drainage site.\">A) Directly into the Left Atrium, causing a right-to-left shunt and cyanosis.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"A Persistent Left Superior Vena Cava (PLSVC) results from the failure of obliteration of the embryonic left anterior cardinal vein. In over 90 percent of cases, it drains directly into the Coronary Sinus, causing marked dilation of the coronary sinus on echocardiography. It is usually an incidental finding, but is clinically important when placing central venous catheters, pacemakers, or during cardioplegia delivery. Reference: ACC\/AHA ACHD Guidelines.\">B) Into the Coronary Sinus, resulting in a dilated coronary sinus on echocardiography.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"The inferior vena cava drains into the right atrium inferiorly; PLSVC drains superiorly.\">C) Directly into the Inferior Vena Cava just below the hepatic hiatus.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Direct drainage into the right pulmonary artery is extremely rare and atypical for PLSVC.\">D) Directly into the Right Pulmonary Artery via an anomalous vertical vein.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q22 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q22<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          According to ACC\/AHA ACHD guidelines, infective endocarditis (IE) prophylaxis is recommended prior to dental procedures for which specific high-risk category of adult congenital heart disease patients?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Prophylaxis is no longer recommended for simple repaired defects after 6 months once endothelialization is complete.\">A) All patients with a successfully repaired secundum ASD with a patch, regardless of time elapsed.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Guidelines restrict IE antibiotic prophylaxis for dental procedures to the highest-risk ACHD patients: 1) Those with a prosthetic cardiac valve or prosthetic material used for cardiac valve repair, 2) Previous history of infective endocarditis, 3) Unrepaired cyanotic congenital heart disease (including palliative shunts and conduits), and 4) Completely repaired congenital heart defects with prosthetic material during the first 6 months after the procedure. Reference: AHA\/ACC Guidelines for the Management of Valvular Heart Disease \/ ACHD.\">B) Patients with prosthetic heart valves, prior history of IE, unrepaired cyanotic CHD, or repaired CHD with residual defects adjacent to prosthetic material.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Isolated native bicuspid aortic valve without prior endocarditis or severe stenosis does not carry a routine recommendation for IE prophylaxis.\">C) All patients with a native congenital bicuspid aortic valve and mild aortic regurgitation.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Mitral valve prolapse without regurgitation or prior endocarditis does not require prophylaxis.\">D) Patients with simple mitral valve prolapse and mild systolic click.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q23 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q23<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          A 22-year-old female with a history of surgically repaired Tetralogy of Fallot presents with palpitations and sudden-onset sustained monomorphic ventricular tachycardia (VT). What is the most common electrophysiological mechanism underlying VT in repaired ToF?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Enhanced automaticity is typical of digitalis toxicity or acute ischemia, not long-term structural scar in ACHD.\">A) Enhanced Phase 4 diastolic depolarization and automaticity of ectopic Purkinje fibers.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Sustained monomorphic ventricular tachycardia in repaired Tetralogy of Fallot is most commonly due to macro-reentry circuits. The anatomical barriers and slow-conduction channels are created by surgical scars\u2014specifically the VSD patch, the RVOT incision\/patch, and the free wall of the dilated, volume-overloaded right ventricle. Radiofrequency catheter ablation targeting these specific narrow isthmuses is often curative. Reference: ACC\/AHA ACHD Guidelines.\">B) Macro-reentrant ventricular tachycardia utilizing slow-conduction channels created by surgical scars (VSD and RVOT patches).<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Triggered activity mediated by early afterdepolarizations (EADs) is the hallmark of long QT syndrome.\">C) Triggered activity secondary to early afterdepolarizations (EADs) induced by hypocalcemia.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Atrioventricular nodal reentrant tachycardia (AVNRT) is a supraventricular tachycardia, not ventricular tachycardia.\">D) Atrioventricular nodal dual-pathway micro-reentry (AVNRT).<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q24 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q24<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          Which congenital heart defect is classically associated with DiGeorge syndrome (22q11.2 microdeletion)?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Secundum ASD is not the primary cardiac defect linked to 22q11.2 deletion.\">A) Secundum Atrial Septal Defect.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"DiGeorge syndrome (CATCH-22: Cardiac anomaly, Abnormal facies, Thymic hypoplasia, Cleft palate, Hypocalcemia\/Hypoparathyroidism) is caused by a 22q11.2 microdeletion. It is classically associated with conotruncal cardiac defects, most frequently Tetralogy of Fallot, Truncus Arteriosus, and Interrupted Aortic Arch. Genetic screening for 22q11 deletion is strongly recommended in patients presenting with these specific lesions. Reference: ACC\/AHA ACHD Guidelines.\">B) Conotruncal defects such as Tetralogy of Fallot, Truncus Arteriosus, and Interrupted Aortic Arch.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Ebstein anomaly is linked to maternal lithium exposure, not 22q11 deletion.\">C) Ebstein Anomaly of the Tricuspid Valve.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"ALCAPA is a rare congenital coronary anomaly, not linked to chromosome 22q11.\">D) Anomalous Left Coronary Artery from the Pulmonary Artery (ALCAPA).<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n    <!-- Q25 -->\n    <div class=\"quiz-card bg-slate-900\/60 border border-solid border-slate-800 rounded-2xl p-5 md:p-6 shadow-lg transition-all duration-300\" data-answered=\"false\">\n      <div class=\"flex items-start gap-3 mb-4\">\n        <span class=\"bg-cyan-950 text-cyan-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-cyan-500\/30\">Q25<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">\n          A 30-year-old male with a history of a small perimembranous VSD presents with persistent fever, weight loss, and new-onset aortic regurgitation. Blood cultures grow Streptococcus viridans. What is the classic echocardiographic finding and mechanism of aortic valve involvement in perimembranous VSD complicated by infective endocarditis?\n        <\/h3>\n      <\/div>\n      <div class=\"grid grid-cols-1 md:grid-cols-2 gap-3 mb-4\">\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Myxomatous degeneration causes floppy mitral valves, not VSD-associated aortic valve prolapse.\">A) Myxomatous degeneration of the mitral valve with secondary chordal rupture.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"true\" data-explanation=\"Perimembranous VSDs are situated immediately beneath the aortic valve. The high-velocity left-to-right shunt jet can pull or suction the adjacent aortic valve cusp (most commonly the right coronary cusp) into the defect, causing 'aortic cusp prolapse' and progressive aortic regurgitation. Furthermore, turbulent flow and endothelial trauma make these prolapsing cusps highly susceptible to bacterial seeding during bacteremia, resulting in infective endocarditis (often referred to as 'endarteritis' or valvular vegetation). Reference: Braunwald's Heart Disease.\">B) Venturi effect of the VSD shunt jet pulling the adjacent aortic valve cusp into the defect, leading to cusp prolapse and vegetation formation.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Rheumatic fever causes commissural fusion and fish-mouth deformity of the mitral valve, not perimembranous VSD endocarditis.\">C) Acute rheumatic carditis causing diffuse thickening of both aortic and mitral valve leaflets.<\/button>\n        <button type=\"button\" class=\"opt-btn text-left p-4 rounded-xl border-2 border-solid border-slate-800 bg-slate-950 hover:bg-slate-900 transition-all text-sm md:text-base font-semibold text-slate-300 cursor-pointer\" data-correct=\"false\" data-explanation=\"Primary myxoma is a benign intracardiac tumor, not an infectious complication of a VSD.\">D) Primary intracardiac myxoma attached to the edges of the ventricular septal defect.<\/button>\n      <\/div>\n      <div class=\"feedback-box hidden p-4 rounded-xl text-sm md:text-base leading-relaxed\"><\/div>\n    <\/div>\n\n  <\/div>\n<\/div>\n\n<script>\n  let mcq34Correct = 0;\n  let mcq34Answered = 0;\n  const mcq34Total = 25;\n\n  document.querySelectorAll('#mcq34-quiz-wrapper .quiz-card').forEach(card => {\n    const buttons = card.querySelectorAll('.opt-btn');\n    buttons.forEach(btn => {\n      btn.addEventListener('click', function() {\n        if (card.getAttribute('data-answered') === 'true') return;\n        card.setAttribute('data-answered', 'true');\n        mcq34Answered++;\n\n        document.getElementById('mcq34-answered-count').innerText = mcq34Answered;\n        const pct = (mcq34Answered \/ mcq34Total) * 100;\n        document.getElementById('mcq34-progress-bar').style.width = pct + '%';\n\n        buttons.forEach(b => {\n          b.disabled = true;\n          b.classList.remove('hover:bg-slate-900', 'cursor-pointer');\n          b.classList.add('opacity-50', 'cursor-not-allowed');\n        });\n\n        const isCorrect = this.getAttribute('data-correct') === 'true';\n        const explanation = this.getAttribute('data-explanation');\n\n        if (isCorrect) {\n          mcq34Correct++;\n          document.getElementById('mcq34-correct-count').innerText = mcq34Correct;\n          this.classList.remove('opacity-50', 'border-slate-800', 'bg-slate-950');\n          this.classList.add('bg-teal-950\/80', 'border-teal-500', 'text-teal-200', 'opacity-100', 'border-2');\n          this.innerHTML += ' <span class=\"font-bold\">&#10004; CORRECT!<\/span>';\n        } else {\n          this.classList.remove('opacity-50', 'border-slate-800', 'bg-slate-950');\n          this.classList.add('bg-cyan-950\/80', 'border-blue-500', 'text-cyan-200', 'opacity-100', 'border-2');\n          this.innerHTML += ' <span class=\"font-bold\">&#10006; INCORRECT<\/span>';\n\n          buttons.forEach(b => {\n            if (b.getAttribute('data-correct') === 'true') {\n              b.classList.remove('opacity-50', 'border-slate-800', 'bg-slate-950');\n              b.classList.add('bg-teal-950\/40', 'border-teal-500\/55', 'text-teal-200', 'opacity-100', 'border-2');\n              b.innerHTML += ' <span class=\"font-bold\">&#10004; (Correct)<\/span>';\n            }\n          });\n        }\n\n        const feedback = card.querySelector('.feedback-box');\n        feedback.innerHTML = `\n          <div class=\"font-extrabold uppercase tracking-widest text-xs mb-2 ${isCorrect ? 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