New Series of Interactive Cardiology MCQs 23: ECG

Q1

According to the original Sgarbossa Criteria used to diagnose acute myocardial infarction in the presence of a Left Bundle Branch Block (LBBB), which of the following findings carries the highest positive predictive value (assigned 5 points)?

Q2

A patient presenting with acute chest pain has an ECG showing upsloping ST-segment depression at the J point in leads V1 to V6, continuing into tall, positive, symmetrical T waves. There is also a 1 to 2 mm ST elevation in lead aVR. What is this specific ECG pattern called, and what does it signify?

Q3

When examining a patient for Wellens Syndrome (indicating critical proximal LAD stenosis during a pain-free period), which morphology accurately describes the Type A pattern?

Q4

A definitive diagnosis of Brugada Syndrome relies on identifying the Type 1 ECG pattern. What is the strict morphological requirement for a Type 1 Brugada pattern in leads V1 or V2?

Q5

Congenital Long QT Syndrome (LQTS) has multiple genotypes that present with distinct T wave morphologies and clinical triggers. Which genotype is classically characterized by low amplitude, NOTCHED (bifid) T waves and is frequently triggered by sudden auditory stimuli (like an alarm clock)?

Q6

A patient with an acute Inferior STEMI (ST elevation in II, III, and aVF) becomes profoundly hypotensive after being administered sublingual nitroglycerin. To definitively diagnose the expected complication using an ECG, which specialized lead should be examined for ST-segment elevation?

Q7

When reviewing the ECG of a young adult with a history of syncope during exercise, you suspect Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC). Which distinctive ECG finding, occurring just after the QRS complex in leads V1-V3, is considered a major diagnostic criterion for ARVC?

Q8

In a patient with Wolff-Parkinson-White (WPW) syndrome, Atrioventricular Reentrant Tachycardia (AVRT) can occur in two main forms based on the direction of the reentrant circuit. How does the ECG morphologically distinguish Orthodromic AVRT from Antidromic AVRT?

Q9

Typical Atrial Flutter involves a macro-reentrant circuit within the right atrium. What specific anatomical structure forms the crucial slow-conduction zone of this circuit and serves as the primary target for curative radiofrequency catheter ablation?

Q10

An ECG showing widespread, generalized T wave flattening accompanied by prominent U waves merging into the T waves (creating a falsely prolonged QT interval) is the classic electrocardiographic hallmark of which severe electrolyte abnormality?

Q11

In the progressive electrocardiographic evolution of severe Hyperkalemia, what is the final, pre-terminal morphology observed immediately before the onset of ventricular fibrillation or asystole?

Q12

To diagnose a Left Anterior Fascicular Block (LAFB), the QRS duration is typically normal or only slightly prolonged. Which pair of findings in the limb leads is absolutely essential to confirm isolated LAFB?

Q13

In a patient with known acquired Long QT Syndrome, which specific sequence of RR intervals on the telemetry monitor is the most classic and potent trigger for the immediate initiation of Torsades de Pointes?

Q14

A patient taking Digoxin has an ECG that displays ‘scooped’ ST-segment depression in leads V5 and V6, resembling Salvador Dali’s mustache. The patient is completely asymptomatic. How should this isolated finding be clinically interpreted?

Q15

While the ‘S1Q3T3’ pattern is the most famously taught ECG sign of acute pulmonary embolism (PE), it is relatively rare and lacks sensitivity. Among patients with a massive acute PE, what is the most frequently observed diagnostic ECG abnormality aside from sinus tachycardia?

Q16

When applying the Brugada Algorithm to differentiate Ventricular Tachycardia (VT) from SVT with aberrancy, what is the very first question/step applied to the precordial leads (V1-V6)?

Q17

The Vereckei Algorithm simplifies wide complex tachycardia differentiation by exclusively analyzing a single lead. According to this algorithm, what finding in lead aVR is highly predictive of Ventricular Tachycardia?

Q18

In Wolff-Parkinson-White (WPW) syndrome, the location of the accessory pathway can be estimated using the 12-lead ECG during sinus rhythm. What does a Type A WPW pattern (characterized by a tall, positive R wave and positive delta wave in lead V1) indicate about the pathway’s location?

Q19

To differentiate the ST-segment elevation of Acute Pericarditis from Benign Early Repolarization (BER), one can calculate the ratio of the ST-segment elevation height to the T-wave amplitude (ST/T ratio) in lead V6. Which ratio strongly suggests Acute Pericarditis?

Q20

A healthy 22-year-old Afro-Caribbean male athlete undergoes a routine screening ECG. The strip shows convex ST-segment elevation followed by symmetric T wave inversions in leads V1 to V4. He is entirely asymptomatic. What is the most appropriate interpretation?

Q21

When diagnosing Left Ventricular Hypertrophy (LVH), the Cornell Voltage Criteria provide improved accuracy by adjusting for gender differences in QRS amplitude. What specific voltage calculation defines LVH in men using the Cornell criteria?

Q22

You observe an ECG showing an underlying sinus rhythm interrupted by sudden pauses. During these pauses, there is no QRS complex or T wave. However, careful inspection reveals a deformed, early T wave immediately preceding the pause. What is the most common cause of this finding?

Q23

An ECG from a patient with a permanent pacemaker reveals pacing spikes occurring precisely on schedule, regardless of the patient’s underlying native rhythm. Several spikes land directly on top of native T waves. Which type of pacemaker malfunction does this represent?

Q24

An elderly patient presents with recurrent syncope. The ECG reveals a classic ‘Trifascicular Block’. Which combination of findings formally defines an incomplete trifascicular block?

Q25

You are analyzing a 12-lead ECG and immediately notice that the P wave, QRS complex, and T wave are completely, universally inverted (negative) in Lead I, while Lead aVR shows completely upright complexes. What is the most reliable clinical step to differentiate true Dextrocardia from accidental Right/Left Arm lead reversal?

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Interactive Cardiology MCQs #23

According to the original Sgarbossa Criteria used to diagnose acute myocardial infarction in the presence of a Left Bundle Branch Block (LBBB), which of the following findings carries the highest positive predictive value (assigned 5 points)?

A patient presenting with acute chest pain has an ECG showing upsloping ST-segment depression at the J point in leads V1 to V6, continuing into tall, positive, symmetrical T waves. There is also a 1 to 2 mm ST elevation in lead aVR. What is this specific ECG pattern called, and what does it signify?

When examining a patient for Wellens Syndrome (indicating critical proximal LAD stenosis during a pain-free period), which morphology accurately describes the Type A pattern?

A definitive diagnosis of Brugada Syndrome relies on identifying the Type 1 ECG pattern. What is the strict morphological requirement for a Type 1 Brugada pattern in leads V1 or V2?

Congenital Long QT Syndrome (LQTS) has multiple genotypes that present with distinct T wave morphologies and clinical triggers. Which genotype is classically characterized by low amplitude, NOTCHED (bifid) T waves and is frequently triggered by sudden auditory stimuli (like an alarm clock)?

A patient with an acute Inferior STEMI (ST elevation in II, III, and aVF) becomes profoundly hypotensive after being administered sublingual nitroglycerin. To definitively diagnose the expected complication using an ECG, which specialized lead should be examined for ST-segment elevation?

When reviewing the ECG of a young adult with a history of syncope during exercise, you suspect Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC). Which distinctive ECG finding, occurring just after the QRS complex in leads V1-V3, is considered a major diagnostic criterion for ARVC?

In a patient with Wolff-Parkinson-White (WPW) syndrome, Atrioventricular Reentrant Tachycardia (AVRT) can occur in two main forms based on the direction of the reentrant circuit. How does the ECG morphologically distinguish Orthodromic AVRT from Antidromic AVRT?

Typical Atrial Flutter involves a macro-reentrant circuit within the right atrium. What specific anatomical structure forms the crucial slow-conduction zone of this circuit and serves as the primary target for curative radiofrequency catheter ablation?

An ECG showing widespread, generalized T wave flattening accompanied by prominent U waves merging into the T waves (creating a falsely prolonged QT interval) is the classic electrocardiographic hallmark of which severe electrolyte abnormality?

In the progressive electrocardiographic evolution of severe Hyperkalemia, what is the final, pre-terminal morphology observed immediately before the onset of ventricular fibrillation or asystole?

To diagnose a Left Anterior Fascicular Block (LAFB), the QRS duration is typically normal or only slightly prolonged. Which pair of findings in the limb leads is absolutely essential to confirm isolated LAFB?

In a patient with known acquired Long QT Syndrome, which specific sequence of RR intervals on the telemetry monitor is the most classic and potent trigger for the immediate initiation of Torsades de Pointes?

A patient taking Digoxin has an ECG that displays ‘scooped’ ST-segment depression in leads V5 and V6, resembling Salvador Dali’s mustache. The patient is completely asymptomatic. How should this isolated finding be clinically interpreted?

While the ‘S1Q3T3’ pattern is the most famously taught ECG sign of acute pulmonary embolism (PE), it is relatively rare and lacks sensitivity. Among patients with a massive acute PE, what is the most frequently observed diagnostic ECG abnormality aside from sinus tachycardia?

When applying the Brugada Algorithm to differentiate Ventricular Tachycardia (VT) from SVT with aberrancy, what is the very first question/step applied to the precordial leads (V1-V6)?

The Vereckei Algorithm simplifies wide complex tachycardia differentiation by exclusively analyzing a single lead. According to this algorithm, what finding in lead aVR is highly predictive of Ventricular Tachycardia?

In Wolff-Parkinson-White (WPW) syndrome, the location of the accessory pathway can be estimated using the 12-lead ECG during sinus rhythm. What does a Type A WPW pattern (characterized by a tall, positive R wave and positive delta wave in lead V1) indicate about the pathway’s location?

To differentiate the ST-segment elevation of Acute Pericarditis from Benign Early Repolarization (BER), one can calculate the ratio of the ST-segment elevation height to the T-wave amplitude (ST/T ratio) in lead V6. Which ratio strongly suggests Acute Pericarditis?

A healthy 22-year-old Afro-Caribbean male athlete undergoes a routine screening ECG. The strip shows convex ST-segment elevation followed by symmetric T wave inversions in leads V1 to V4. He is entirely asymptomatic. What is the most appropriate interpretation?

When diagnosing Left Ventricular Hypertrophy (LVH), the Cornell Voltage Criteria provide improved accuracy by adjusting for gender differences in QRS amplitude. What specific voltage calculation defines LVH in men using the Cornell criteria?

You observe an ECG showing an underlying sinus rhythm interrupted by sudden pauses. During these pauses, there is no QRS complex or T wave. However, careful inspection reveals a deformed, early T wave immediately preceding the pause. What is the most common cause of this finding?

An ECG from a patient with a permanent pacemaker reveals pacing spikes occurring precisely on schedule, regardless of the patient’s underlying native rhythm. Several spikes land directly on top of native T waves. Which type of pacemaker malfunction does this represent?

An elderly patient presents with recurrent syncope. The ECG reveals a classic ‘Trifascicular Block’. Which combination of findings formally defines an incomplete trifascicular block?

About The Author

Johnson Francis

Interactive Cardiology MCQs #23

According to the original Sgarbossa Criteria used to diagnose acute myocardial infarction in the presence of a Left Bundle Branch Block (LBBB), which of the following findings carries the highest positive predictive value (assigned 5 points)?

When examining a patient for Wellens Syndrome (indicating critical proximal LAD stenosis during a pain-free period), which morphology accurately describes the Type A pattern?

A definitive diagnosis of Brugada Syndrome relies on identifying the Type 1 ECG pattern. What is the strict morphological requirement for a Type 1 Brugada pattern in leads V1 or V2?

Congenital Long QT Syndrome (LQTS) has multiple genotypes that present with distinct T wave morphologies and clinical triggers. Which genotype is classically characterized by low amplitude, NOTCHED (bifid) T waves and is frequently triggered by sudden auditory stimuli (like an alarm clock)?

A patient with an acute Inferior STEMI (ST elevation in II, III, and aVF) becomes profoundly hypotensive after being administered sublingual nitroglycerin. To definitively diagnose the expected complication using an ECG, which specialized lead should be examined for ST-segment elevation?

When reviewing the ECG of a young adult with a history of syncope during exercise, you suspect Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC). Which distinctive ECG finding, occurring just after the QRS complex in leads V1-V3, is considered a major diagnostic criterion for ARVC?

In a patient with Wolff-Parkinson-White (WPW) syndrome, Atrioventricular Reentrant Tachycardia (AVRT) can occur in two main forms based on the direction of the reentrant circuit. How does the ECG morphologically distinguish Orthodromic AVRT from Antidromic AVRT?

Typical Atrial Flutter involves a macro-reentrant circuit within the right atrium. What specific anatomical structure forms the crucial slow-conduction zone of this circuit and serves as the primary target for curative radiofrequency catheter ablation?

An ECG showing widespread, generalized T wave flattening accompanied by prominent U waves merging into the T waves (creating a falsely prolonged QT interval) is the classic electrocardiographic hallmark of which severe electrolyte abnormality?

In the progressive electrocardiographic evolution of severe Hyperkalemia, what is the final, pre-terminal morphology observed immediately before the onset of ventricular fibrillation or asystole?

To diagnose a Left Anterior Fascicular Block (LAFB), the QRS duration is typically normal or only slightly prolonged. Which pair of findings in the limb leads is absolutely essential to confirm isolated LAFB?

In a patient with known acquired Long QT Syndrome, which specific sequence of RR intervals on the telemetry monitor is the most classic and potent trigger for the immediate initiation of Torsades de Pointes?

A patient taking Digoxin has an ECG that displays ‘scooped’ ST-segment depression in leads V5 and V6, resembling Salvador Dali’s mustache. The patient is completely asymptomatic. How should this isolated finding be clinically interpreted?

While the ‘S1Q3T3’ pattern is the most famously taught ECG sign of acute pulmonary embolism (PE), it is relatively rare and lacks sensitivity. Among patients with a massive acute PE, what is the most frequently observed diagnostic ECG abnormality aside from sinus tachycardia?

When applying the Brugada Algorithm to differentiate Ventricular Tachycardia (VT) from SVT with aberrancy, what is the very first question/step applied to the precordial leads (V1-V6)?

The Vereckei Algorithm simplifies wide complex tachycardia differentiation by exclusively analyzing a single lead. According to this algorithm, what finding in lead aVR is highly predictive of Ventricular Tachycardia?

In Wolff-Parkinson-White (WPW) syndrome, the location of the accessory pathway can be estimated using the 12-lead ECG during sinus rhythm. What does a Type A WPW pattern (characterized by a tall, positive R wave and positive delta wave in lead V1) indicate about the pathway’s location?

To differentiate the ST-segment elevation of Acute Pericarditis from Benign Early Repolarization (BER), one can calculate the ratio of the ST-segment elevation height to the T-wave amplitude (ST/T ratio) in lead V6. Which ratio strongly suggests Acute Pericarditis?

A healthy 22-year-old Afro-Caribbean male athlete undergoes a routine screening ECG. The strip shows convex ST-segment elevation followed by symmetric T wave inversions in leads V1 to V4. He is entirely asymptomatic. What is the most appropriate interpretation?

When diagnosing Left Ventricular Hypertrophy (LVH), the Cornell Voltage Criteria provide improved accuracy by adjusting for gender differences in QRS amplitude. What specific voltage calculation defines LVH in men using the Cornell criteria?

You observe an ECG showing an underlying sinus rhythm interrupted by sudden pauses. During these pauses, there is no QRS complex or T wave. However, careful inspection reveals a deformed, early T wave immediately preceding the pause. What is the most common cause of this finding?

An ECG from a patient with a permanent pacemaker reveals pacing spikes occurring precisely on schedule, regardless of the patient’s underlying native rhythm. Several spikes land directly on top of native T waves. Which type of pacemaker malfunction does this represent?

An elderly patient presents with recurrent syncope. The ECG reveals a classic ‘Trifascicular Block’. Which combination of findings formally defines an incomplete trifascicular block?

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About The Author

Johnson Francis