{"id":67990,"date":"2026-10-26T11:14:57","date_gmt":"2026-10-26T05:44:57","guid":{"rendered":"https:\/\/johnsonfrancis.org\/professional\/?p=67990"},"modified":"2026-10-26T11:15:00","modified_gmt":"2026-10-26T05:45:00","slug":"new-series-of-interactive-cardiology-mcqs-14","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/new-series-of-interactive-cardiology-mcqs-14\/","title":{"rendered":"New Series of Interactive Cardiology MCQs 14"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n\n\n<!-- Cardiology MCQs Part 14 (Full 25 Questions) - WordPress Safe Custom HTML Block -->\n<script src=\"https:\/\/cdn.tailwindcss.com?plugins=forms,typography,aspect-ratio\"><\/script>\n<script>\n  tailwind.config = {\n    corePlugins: { preflight: false }\n  }\n<\/script>\n\n<div id=\"mcq14-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-emerald-500\/20\" style=\"box-sizing: border-box;\">\n  \n  <!-- Background Accents -->\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-teal-500 via-emerald-900 to-slate-950\"><\/div>\n  \n  <!-- Header Banner -->\n  <div class=\"relative text-center pb-6 border-b border-solid border-emerald-500\/25 mb-8\">\n    <div class=\"inline-block bg-gradient-to-r from-emerald-600 via-teal-600 to-cyan-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      \u2764\ufe0f Advanced Cardiology Series &#8211; Part 14\n    <\/div>\n    <h1 class=\"text-3xl md:text-5xl font-extrabold tracking-tight text-transparent bg-clip-text bg-gradient-to-r from-emerald-300 via-teal-400 to-cyan-400 m-0\">\n      Interactive Cardiology MCQs #14\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 Clinical, ECG &#038; Hemodynamic Masterclass\n    <\/p>\n  <\/div>\n\n  <!-- Real-Time Floating Scoreboard -->\n  <div class=\"sticky top-4 z-40 bg-slate-900\/90 backdrop-blur-md border-2 border-solid border-teal-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\">\ud83c\udfc6<\/div>\n      <div>\n        <div class=\"text-[10px] uppercase font-extrabold tracking-widest text-teal-300\">Live Scoreboard<\/div>\n        <div class=\"text-lg md:text-2xl font-black text-emerald-300 flex items-center gap-1\">\n          <span id=\"mcq14-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=\"mcq14-progress-bar\" class=\"bg-gradient-to-r from-teal-500 to-emerald-400 h-full w-0 transition-all duration-300 rounded-full\"><\/div>\n      <\/div>\n      <span class=\"text-xs font-bold text-emerald-300\"><span id=\"mcq14-answered-count\">0<\/span>\/25<\/span>\n    <\/div>\n  <\/div>\n\n  <!-- Quiz Questions Container -->\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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q1<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">A 68-year-old patient with classical low-flow, low-gradient aortic stenosis (aortic valve area 0.8 cm&sup2;, mean gradient 28 mmHg, LVEF 30%) undergoes dobutamine stress echocardiography. Which finding confirms true severe aortic stenosis rather than pseudosevere AS?<\/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=\"This describes pseudosevere aortic stenosis, where the valve can open further once flow increases.\">A. The aortic valve area increases to 1.3 cm&sup2; with a mean gradient of 32 mmHg.<\/button><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=\"True severe AS is confirmed if stroke volume increases by &gt;= 20% (flow reserve), the mean gradient increases to &gt;= 40 mmHg, but the valve area remains essentially fixed (&lt; 1.0 cm&sup2;).\">B. The mean gradient increases to 42 mmHg while the aortic valve area remains 0.8 cm&sup2;.<\/button><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=\"This represents a lack of contractile (flow) reserve, meaning the study is indeterminate for severity based on gradients alone.\">C. The stroke volume does not increase by at least 20%, and the gradient remains unchanged.<\/button><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=\"Increasing LVEF without a corresponding gradient increase &gt;= 40 mmHg does not confirm true severe AS.\">D. The LVEF increases to 50% while the mean gradient remains 30 mmHg.<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q2<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">When transitioning a patient with heart failure with reduced ejection fraction (HFrEF) from an ACE inhibitor (e.g., enalapril) to an ARNI (sacubitril\/valsartan), what is the mandatory washout period and the primary reason for it?<\/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=\"This is incorrect for both duration and rationale.\">A. 24 hours to prevent profound hypotensive shock<\/button><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 strict 36-hour washout period is required when switching from an ACE inhibitor to an ARNI to minimize the risk of severe angioedema, due to the overlapping mechanisms of bradykinin degradation inhibition.\">B. 36 hours to prevent severe angioedema<\/button><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=\"No washout is required when switching from an ARB to an ARNI, only from an ACE inhibitor.\">C. 48 hours to prevent acute hyperkalemia<\/button><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=\"This is factually incorrect.\">D. No washout period is necessary if renal function is normal<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q3<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">In tissue Doppler imaging (TDI) of the mitral annulus, what is the significance of &#8220;annulus reversus&#8221;?<\/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=\"true\" data-explanation=\"Normally, lateral e' velocity is higher than septal e' velocity. In constrictive pericarditis, the tethering of the lateral free wall by the rigid pericardium causes the lateral e' to be lower than the septal e' (annulus reversus).\">A. It is a hallmark of constrictive pericarditis where the septal e&#8217; velocity is greater than the lateral e&#8217; velocity.<\/button><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=\"Restrictive cardiomyopathy classically preserves the normal relationship (lateral e' &gt; septal e'), though both are reduced.\">B. It is a hallmark of restrictive cardiomyopathy where the lateral e&#8217; velocity remains higher than the septal e&#8217; velocity.<\/button><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=\"This describes a manifestation of severe MR or poor atrial compliance, not annulus reversus.\">C. It indicates severe mitral regurgitation due to systolic flow reversal into the pulmonary veins.<\/button><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=\"This defines a pseudonormal filling pattern, not annulus reversus.\">D. It reflects a pseudo-normal transmitral flow pattern reversible with Valsalva maneuver.<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q4<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">A patient presents with classical chest pain. An ECG demonstrates upright, symmetrical, and prominent T waves in the precordial leads (V1-V6) with a > 1 mm J-point ST depression. What does this &#8220;de Winter&#8221; ECG pattern indicate?<\/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=\"This describes Brugada pattern Type 1.\">A. A channelopathy involving a mutation in the SCN5A gene<\/button><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 vasospasm typically presents with transient ST elevations (Prinzmetal angina).\">B. Severe multi-vessel coronary vasospasm<\/button><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 de Winter pattern (upsloping ST depression leading into tall, symmetrical T waves in precordial leads) is an anterior STEMI equivalent indicating acute proximal LAD occlusion. It requires emergent reperfusion therapy.\">C. Acute, complete occlusion of the proximal Left Anterior Descending (LAD) artery<\/button><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=\"This describes Wellens syndrome (Type A or B), which occurs in a pain-free state.\">D. Critical LAD stenosis in a patient who is currently pain-free<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q5<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">In invasive coronary physiology, what is the primary difference between Fractional Flow Reserve (FFR) and instantaneous wave-free ratio (iFR)?<\/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=\"true\" data-explanation=\"FFR calculates the pressure ratio across a stenosis during maximal hyperemia (requiring adenosine). iFR measures the ratio during a specific period of diastole when microvascular resistance is naturally minimized, requiring no vasodilator.\">A. FFR requires the administration of a hyperemic agent (e.g., adenosine), whereas iFR is measured at rest during a specific phase of diastole.<\/button><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=\"Both are pressure-derived indices. Flow velocity requires a Doppler wire (CFR).\">B. FFR is a pressure-derived index, while iFR relies exclusively on flow velocity measurements.<\/button><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 ischemic threshold for FFR is &lt;= 0.80, and for iFR is &lt;= 0.89.\">C. The ischemic cutoff for FFR is &lt;= 0.90, whereas the cutoff for iFR is &lt;= 0.80.<\/button><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=\"Both correlate well, though they measure slightly different physiological states.\">D. iFR is primarily validated for venous bypass grafts, while FFR is restricted to native arteries.<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q6<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">A 72-year-old patient with suspected transthyretin cardiac amyloidosis (ATTR-CA) undergoes a Technetium-99m pyrophosphate (Tc-99m PYP) scan. The scan yields a Grade 3 uptake. What does this grade signify?<\/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=\"Grade 3 specifically denotes bone uptake, not lung.\">A. Intense myocardial uptake that is less than rib uptake<\/button><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 Tc-99m PYP imaging for ATTR amyloidosis, Grade 3 uptake means the myocardial tracer uptake is greater than the uptake in the ribs (bone). Grades 2 or 3 are highly specific for ATTR-CA if a monoclonal protein screen is negative.\">B. Myocardial tracer uptake that is visually greater than rib uptake<\/button><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=\"This represents Grade 0.\">C. No visible myocardial tracer uptake<\/button><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=\"AL amyloidosis typically yields Grade 0 or 1, not Grade 3.\">D. High probability of AL (light chain) amyloidosis<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q7<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">In the evaluation of a jugular venous pulse (JVP) tracing, the presence of irregular &#8220;cannon a-waves&#8221; is pathognomonic for which of the following?<\/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=\"Tricuspid stenosis causes prominent, regular a-waves, not irregular cannon a-waves.\">A. Severe tricuspid stenosis<\/button><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=\"Cannon a-waves occur when the right atrium contracts against a closed tricuspid valve during right ventricular systole. Irregular cannon a-waves are a hallmark of atrioventricular (AV) dissociation, such as in complete heart block or ventricular tachycardia.\">B. Atrioventricular (AV) dissociation<\/button><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=\"Tricuspid regurgitation abolishes the x-descent and causes a large fused c-v wave (Lancisi sign).\">C. Severe tricuspid regurgitation<\/button><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=\"In atrial fibrillation, the a-wave is completely absent.\">D. Atrial fibrillation<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q8<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">What is the long-term complication most universally expected in adult patients who underwent complete surgical repair of Tetralogy of Fallot involving a transannular patch during childhood?<\/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=\"Aortic dissection is rare in TOF compared to conditions like Marfan syndrome.\">A. Aortic root dilation leading to type A dissection<\/button><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 some obstruction may recur, severe PR is far more common due to the destruction of the valve annulus by the patch.\">B. Rapidly progressive, severe right ventricular outflow tract obstruction<\/button><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 transannular patch disrupts the integrity of the pulmonary valve. Over decades, this almost inevitably leads to severe, free pulmonary regurgitation, right ventricular dilation, and increased risk of ventricular arrhythmias.\">C. Severe pulmonary regurgitation resulting in right ventricular volume overload<\/button><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=\"Recurrent VSD is uncommon if the initial patch repair was successful.\">D. Recurrence of a large 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    <!-- 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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q9<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">Amiodarone is unique among Class III antiarrhythmics. Which of the following best describes its distinct properties and side effect profile?<\/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=\"true\" data-explanation=\"Amiodarone possesses Class I, II, III, and IV properties. It contains approximately 37% iodine by weight, structurally resembling thyroxine, which leads to both hypo- and hyperthyroidism as prominent side effects.\">A. It blocks multiple ion channels (I, II, III, IV) and contains a high concentration of iodine, predisposing to thyroid dysfunction.<\/button><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=\"Amiodarone actually has a very low rate of inducing Torsades de Pointes despite prolonging the QT interval.\">B. It is a pure potassium channel blocker with a remarkably high risk of Torsades de Pointes.<\/button><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=\"Amiodarone has a very long half-life (often months) due to extensive lipophilic tissue binding.\">C. It has an extremely short half-life of 2-4 hours, necessitating continuous infusion.<\/button><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=\"It reduces renal clearance of digoxin, raising digoxin levels. It is also hepatically metabolized.\">D. It significantly increases the renal clearance of digoxin, requiring higher digoxin doses.<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q10<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">In a patient with Wolff-Parkinson-White (WPW) syndrome who presents with pre-excited Atrial Fibrillation (AFib) and a heart rate of 190 bpm, but maintains stable blood pressure, which pharmacological agent is recommended?<\/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=\"Verapamil is strictly contraindicated as AV nodal block will force all impulses down the accessory pathway, potentially causing VF.\">A. Intravenous Verapamil<\/button><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=\"Digoxin is contraindicated for the same AV nodal blocking reasons.\">B. Intravenous Digoxin<\/button><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 hemodynamically stable pre-excited AFib, the goal is to block the accessory pathway. Procainamide (or ibutilide) is the drug of choice. AV nodal blockers (beta-blockers, CCBs, adenosine) are absolutely contraindicated.\">C. Intravenous Procainamide<\/button><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=\"Adenosine blocks the AV node and can precipitate VF in this specific scenario.\">D. Intravenous Adenosine<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q11<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">According to current guidelines, what is the target &#8220;door-to-balloon&#8221; time for primary percutaneous coronary intervention (PCI) in a patient presenting to a PCI-capable hospital with a STEMI?<\/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=\"60 minutes is the optimal goal often achieved, but the guideline mandate is &lt;= 90 minutes.\">A. &lt;= 60 minutes<\/button><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 established standard of care for a STEMI presenting to a PCI-capable facility is a door-to-balloon time (or door-to-device time) of &lt;= 90 minutes.\">B. &lt;= 90 minutes<\/button><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=\"120 minutes is the target for transfers from a non-PCI center to a PCI center.\">C. &lt;= 120 minutes<\/button><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=\"30 minutes is the 'door-to-needle' goal for thrombolytics, not PCI.\">D. &lt;= 30 minutes<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q12<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">Which physical exam finding differentiates severe tricuspid regurgitation (TR) from severe mitral regurgitation (MR)?<\/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=\"Both are holosystolic murmurs.\">A. The TR murmur is holosystolic, while MR is mid-systolic.<\/button><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=\"Radiating to the axilla is classic for MR, not TR.\">B. The TR murmur radiates widely to the axilla and back.<\/button><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=\"Carvallo's sign is an increase in the intensity of a right-sided murmur (like TR) during inspiration due to increased venous return. Left-sided murmurs (like MR) do not increase, and often decrease, during inspiration.\">C. The intensity of the TR murmur increases during inspiration (Carvallo&#8217;s sign).<\/button><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=\"TR is associated with prominent v waves in the JVP, not prominent a waves.\">D. TR is associated with giant &#8216;a&#8217; waves in the jugular venous pulse.<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q13<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">In echocardiography, the Pressure Half-Time (PHT) method is commonly used to estimate Mitral Valve Area (MVA) in mitral stenosis. What is the empirical constant used in the formula MVA = Constant \/ PHT?<\/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=\"190 is not the standard constant.\">A. 190<\/button><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 empirical formula for calculating MVA using Pressure Half-Time is MVA = 220 \/ PHT. A PHT of &gt;= 150 ms corresponds to severe mitral stenosis (MVA &lt;= 1.5 cm&sup2;).\">B. 220<\/button><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=\"380 is not the correct constant.\">C. 380<\/button><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=\"400 is associated with calculating aortic valve area via continuity equation in some specific simplified rules, not PHT for MS.\">D. 400<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q14<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">Which statement accurately describes the mechanism of action of PCSK9 inhibitors (e.g., evolocumab, alirocumab)?<\/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=\"This describes statins.\">A. They directly inhibit HMG-CoA reductase in the liver.<\/button><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=\"PCSK9 is an enzyme that binds to LDL receptors and promotes their lysosomal degradation. By inhibiting PCSK9, these drugs prevent LDL receptor breakdown, dramatically increasing their density on the hepatocyte surface and accelerating LDL clearance from the blood.\">B. They prevent the degradation of LDL receptors on hepatocytes, increasing LDL clearance.<\/button><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=\"This describes ezetimibe.\">C. They block the absorption of cholesterol in the small intestine via the NPC1L1 transporter.<\/button><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=\"This describes fibrates (PPAR-alpha agonists).\">D. They activate PPAR-alpha to increase lipoprotein lipase activity.<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q15<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">Following a Transcatheter Aortic Valve Replacement (TAVR), which conduction abnormality is the most common reason for requiring a permanent pacemaker implant?<\/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=\"RBBB is far less common than LBBB post-TAVR.\">A. New-onset Right Bundle Branch Block (RBBB)<\/button><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 left bundle branch runs superficially just below the aortic valve annulus. Radial force from the TAVR bioprosthesis frequently causes injury here, making new-onset Left Bundle Branch Block (LBBB) progressing to complete heart block the primary reason for pacemaker placement.\">B. New-onset Left Bundle Branch Block (LBBB)<\/button><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=\"Wenckebach block is an AV nodal issue; TAVR primarily affects the infra-Nodal His-Purkinje system.\">C. Second-degree AV Block Type I (Wenckebach)<\/button><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 AFib occurs, it does not mandate a permanent pacemaker unless accompanied by severe bradycardia.\">D. New-onset Atrial Fibrillation with rapid ventricular response<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q16<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">Which clinical presentation distinguishes Long QT Syndrome Type 3 (LQT3) from Types 1 and 2?<\/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=\"Swimming is a classic trigger for LQT1.\">A. Arrhythmias are most commonly triggered by swimming and exercise.<\/button><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=\"Sudden loud noises (like an alarm clock) are the classic trigger for LQT2.\">B. Arrhythmias are primarily triggered by sudden loud noises or acoustic startle.<\/button><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=\"LQT3 (a sodium channel SCN5A mutation) typically triggers lethal arrhythmias during rest, sleep, or bradycardic states, unlike LQT1 (exercise) or LQT2 (auditory stimuli).\">C. Arrhythmias most frequently occur during rest or sleep (bradycardic states).<\/button><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=\"LQT3 does not characteristically present with deafness (that is Jervell and Lange-Nielsen syndrome).\">D. It is inherited autosomally recessively and presents with profound sensorineural deafness.<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q17<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">In patients with Hypertrophic Obstructive Cardiomyopathy (HOCM), Systolic Anterior Motion (SAM) of the mitral valve results in dynamic Left Ventricular Outflow Tract (LVOT) obstruction. What concurrent valvular issue almost always accompanies SAM?<\/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=\"Aortic regurgitation is not a direct consequence of SAM.\">A. Acute severe aortic regurgitation<\/button><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=\"As the anterior mitral leaflet is pulled into the LVOT during systole (SAM), it fails to coapt with the posterior leaflet, resulting in a posteriorly directed jet of eccentric mitral regurgitation.\">B. Eccentric, posteriorly directed mitral regurgitation<\/button><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 jet is typically directed posteriorly, not centrally.\">C. Central, severe mitral stenosis<\/button><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=\"Tricuspid involvement is independent of left-sided SAM.\">D. Concomitant tricuspid valve prolapse<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q18<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">When performing a right heart catheterization, which parameter specifically defines pre-capillary Pulmonary Arterial Hypertension (WHO Group 1) as opposed to post-capillary pulmonary hypertension (WHO Group 2)?<\/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=\"An elevated mPAP applies to all groups of pulmonary hypertension.\">A. A mean Pulmonary Arterial Pressure (mPAP) &gt; 20 mmHg<\/button><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=\"Group 1 PAH is a pre-capillary problem. It requires a Pulmonary Capillary Wedge Pressure (PCWP) &lt;= 15 mmHg. If the PCWP is &gt; 15 mmHg, the pulmonary hypertension is post-capillary (Group 2), driven by left heart disease.\">B. A Pulmonary Capillary Wedge Pressure (PCWP) &lt;= 15 mmHg<\/button><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=\"PVR &gt; 2 Wood Units is required for pre-capillary, but post-capillary (combined) can also have elevated PVR. The definitive differentiating factor is the wedge pressure.\">C. A Pulmonary Vascular Resistance (PVR) &lt; 2 Wood Units<\/button><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=\"Thermodilution cardiac output values alone do not define the WHO grouping.\">D. A severely reduced Cardiac Index (&lt; 2.0 L\/min\/m&sup2;)<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q19<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">In cardio-oncology, how does anthracycline-induced cardiotoxicity (e.g., Doxorubicin) primarily differ clinically from trastuzumab-induced cardiotoxicity?<\/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=\"true\" data-explanation=\"Anthracycline toxicity causes cumulative, dose-dependent myocardial necrosis\/apoptosis (Type I) which is typically irreversible. Trastuzumab causes cellular dysfunction (Type II) without necrosis, making the LV dysfunction largely reversible upon drug cessation.\">A. Anthracycline toxicity causes cumulative, dose-dependent, irreversible myocyte necrosis, while trastuzumab causes largely reversible cellular dysfunction without necrosis.<\/button><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=\"Anthracycline toxicity is generally irreversible; trastuzumab is reversible.\">B. Anthracycline toxicity is reversible upon drug withdrawal, whereas trastuzumab toxicity is permanent.<\/button><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=\"Neither drug primarily causes massive pericardial effusions as their classic presentation.\">C. Anthracycline toxicity primarily manifests as a massive hemorrhagic pericardial effusion.<\/button><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=\"Both are associated with significant incidence of HF.\">D. Trastuzumab has no known effect on left ventricular ejection fraction.<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q20<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">When evaluating a wide-complex tachycardia on an ECG, which feature definitively establishes the diagnosis as Ventricular Tachycardia (VT) rather than SVT with aberrancy?<\/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 suggesting VT, extreme left axis deviation can occur with some aberrancies.\">A. An extreme left axis deviation (-60 degrees)<\/button><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 heart rate of 220 bpm does not distinguish between the two.\">B. A heart rate exceeding 220 bpm<\/button><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=\"SVT with bundle branch block often has typical RBBB morphology.\">C. A typical Right Bundle Branch Block (RBBB) morphology in V1<\/button><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=\"AV dissociation (P waves marching through the QRS complexes independently) is the hallmark, definitive criterion for Ventricular Tachycardia, proving the ventricles are beating independently of the atria.\">D. The presence of atrioventricular (AV) dissociation<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q21<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">In intracoronary imaging, what is the principal advantage of Optical Coherence Tomography (OCT) compared to Intravascular Ultrasound (IVUS)?<\/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=\"true\" data-explanation=\"OCT uses near-infrared light providing roughly 10x higher spatial resolution (10-20 microns) than IVUS (100-200 microns). This allows detailed visualization of thin-cap fibroatheromas, thrombi, and stent struts.\">A. OCT provides significantly higher spatial resolution, allowing detailed visualization of thin-cap fibroatheromas and stent strut apposition.<\/button><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=\"This is the advantage of IVUS. OCT has poor tissue penetration depth (1-2 mm).\">B. OCT provides much deeper tissue penetration, allowing assessment of total plaque burden behind heavy calcifications.<\/button><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=\"OCT strictly requires a bloodless field, usually achieved by a vigorous contrast flush.\">C. OCT does not require contrast flushes because it can easily image through dense red blood cells.<\/button><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=\"IVUS is excellent for aorto-ostial lesions where clearing blood with contrast for OCT is very difficult.\">D. OCT is the superior modality for evaluating aorto-ostial left main disease due to ease of positioning.<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q22<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">A patient with a mechanical mitral valve presents with acute pulmonary edema. Fluoroscopy reveals severely restricted leaflet motion. An echocardiogram confirms obstructive valve thrombosis. She is hemodynamically unstable. According to guidelines, what is the preferred first-line therapy?<\/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=\"Heparin alone is insufficient for massive, obstructive, hemodynamically unstable valve thrombosis.\">A. Initiate continuous high-dose intravenous unfractionated heparin<\/button><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=\"For obstructive mechanical valve thrombosis presenting with cardiogenic shock or severe heart failure, emergency surgical valve replacement\/thrombectomy is a Class 1 recommendation. Fibrinolysis is reserved for right-sided valves or if surgery is contraindicated\/unavailable.\">B. Emergency surgical valve replacement or thrombectomy<\/button><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=\"Fibrinolysis (tPA) is a Class IIa\/IIb alternative for left-sided valves due to high systemic embolic risk, only preferred if surgery is inaccessible.\">C. Immediate administration of systemic tissue plasminogen activator (tPA)<\/button><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=\"This is appropriate for DVT\/PE, but completely inadequate for catastrophic mechanical valve thrombosis.\">D. Administer a loading dose of a direct oral anticoagulant (e.g., apixaban)<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q23<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">In right heart catheterization, which hemodynamic profile is classic for isolated acute right ventricular myocardial infarction?<\/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=\"true\" data-explanation=\"Right ventricular infarction paralyzes the RV. This causes right atrial pressure (RAP) to spike, but because the left ventricle is underfilled, the pulmonary capillary wedge pressure (PCWP) remains low\/normal.\">A. Elevated Right Atrial Pressure (RAP), low-to-normal PCWP, and depressed cardiac output<\/button><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=\"This represents biventricular failure or severe left-sided failure causing secondary right-sided failure.\">B. Elevated Right Atrial Pressure (RAP) and symmetrically elevated PCWP (&gt;25 mmHg)<\/button><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=\"This indicates hypovolemia.\">C. Low Right Atrial Pressure (RAP), low PCWP, and low cardiac output<\/button><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=\"High PCWP characterizes left-sided failure. Isolated RV infarct drops left-sided filling pressures.\">D. Normal Right Atrial Pressure (RAP) but extremely elevated PCWP<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q24<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">A patient&#8217;s ECG shows a &#8220;Type 1&#8221; Brugada pattern (coved ST-segment elevation &gt;2 mm followed by a negative T wave in V1-V2). To unmask or provoke a Brugada ECG pattern in suspected patients, which class of drugs is infused during testing?<\/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=\"Beta-blockers can slow the heart but are not standard provocations for Brugada.\">A. Beta-blockers (e.g., Esmolol)<\/button><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=\"Brugada syndrome involves a loss-of-function in sodium channels. Administering a sodium channel blocker (Class Ic antiarrhythmic like Ajmaline, Flecainide, or Procainamide) exacerbates the defect and provokes the diagnostic ECG pattern.\">B. Sodium channel blockers (e.g., Ajmaline or Flecainide)<\/button><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=\"Calcium channel blockers are used to provoke coronary vasospasm (ergonovine\/acetylcholine) but not Brugada.\">C. Calcium channel blockers (e.g., Verapamil)<\/button><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=\"Isoproterenol is actually used to treat electrical storms in Brugada syndrome; it diminishes the ST elevation.\">D. Beta-agonists (e.g., Isoproterenol)<\/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-teal-950 text-emerald-300 font-extrabold px-3 py-1.5 rounded-lg text-sm border border-solid border-teal-500\/30\">Q25<\/span>\n        <h3 class=\"text-lg md:text-xl font-bold text-slate-100 m-0 leading-snug\">What is the &#8220;Gorlin Formula&#8221; used for in the cardiac catheterization laboratory?<\/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=\"true\" data-explanation=\"The Gorlin equation uses cardiac output, heart rate, and the mean pressure gradient across a valve to accurately calculate the cross-sectional area of stenotic valves (primarily aortic and mitral).\">A. To calculate native valvular orifice area using cardiac output and transvalvular pressure gradients.<\/button><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=\"This is calculated using Fick's principle or Thermodilution, not the Gorlin formula.\">B. To measure true continuous cardiac output using mixed venous oxygen saturation.<\/button><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 flow reserve uses distal pressure over aortic pressure ratios (FFR formula).\">C. To calculate coronary flow reserve during maximal hyperemia.<\/button><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 is calculated as (mPAP - PCWP) \/ Cardiac Output.\">D. 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