⚡ Advanced Cardiology Series – Part 22
Interactive Cardiology MCQs #22
Post-Graduate Level Masterclass: Electrocardiography II
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Q1
During an episode of Atrial Fibrillation, an ECG displays occasional wide QRS complexes. You suspect the Ashman Phenomenon rather than premature ventricular contractions (PVCs). Which classic sequence of R-R intervals reliably triggers aberrant conduction in the Ashman Phenomenon?
Q2
When interpreting a wide complex tachycardia, the presence of Capture Beats and Fusion Beats is highly specific for which of the following arrhythmias?
Q3
An ECG reveals a regular narrow-complex tachycardia at a rate of 150 bpm. In lead V1, there is a distinct positive deflection at the very end of the QRS complex, resembling a ‘pseudo r-prime’ (r’) wave, which is absent on the patient’s baseline sinus rhythm ECG. What is the most likely diagnosis?
Q4
A patient recovering from a massive subarachnoid hemorrhage exhibits profound ECG changes, including deep, wide, and symmetrically inverted T waves across the precordium (the ‘Niagara Waterfall’ T waves) with significant QT prolongation. Which pathophysiological mechanism drives these specific ECG changes?
Q5
During ECG review, you note an isolated, pathological Q wave in lead III, while leads II and aVF are entirely normal. To determine if this isolated Q wave in lead III is a normal variant or a sign of an old inferior infarction, what simple clinical maneuver should be performed while running a rhythm strip?
Q6
A patient’s ECG shows regular sinus rhythm interrupted by sudden pauses. During the pause, an entire P-QRS-T complex is missing. Careful caliper measurement reveals that the duration of the pause is an EXACT mathematical multiple (e.g., exactly 2x) of the patient’s basic P-P interval. What is the diagnosis?
Q7
A patient receives thrombolytic therapy for an Acute Anterior STEMI. Thirty minutes later, the bedside monitor shows a wide-complex rhythm with no visible P waves at a rate of 75 bpm. The patient is asymptomatic and hemodynamically stable. What is this rhythm, and what does it indicate?
Q8
A 68-year-old patient with severe Chronic Obstructive Pulmonary Disease (COPD) presents with palpitations. The ECG shows an irregularly irregular narrow-complex tachycardia at 130 bpm. Crucially, there are distinct P waves before every QRS, but you observe at least three distinct P-wave morphologies in the same lead. What is the diagnosis?
Q9
A patient develops a wide-complex tachycardia where the QRS axis dramatically alternates by 180 degrees back and forth on every consecutive beat. This highly characteristic ‘Bidirectional Ventricular Tachycardia’ is considered pathognomonic for which specific toxicity or genetic disorder?
Q10
During an interpretation of an ECG from a patient with profound metabolic derangements, you note a significantly prolonged QT interval. However, careful inspection reveals that the T wave width is entirely normal; the prolongation is exclusively due to an abnormally lengthened, flat ST segment. Which electrolyte imbalance specifically causes this morphology?
Q11
When examining the ECG of a patient with suspected Pericarditis, you look for ‘Spodick’s Sign’ to help differentiate it from Acute Coronary Syndrome. What is the definition of Spodick’s Sign?
Q12
A patient recently had a permanent ventricular pacemaker explanted. For several weeks afterward, their native ECG shows profound, deep, symmetrical T wave inversions in the leads that previously showed wide paced QRS complexes, despite normal coronary angiograms. What is this electrophysiological phenomenon?
Q13
An ECG reveals a tachycardia at 150 bpm. You are struggling to determine if P waves are present. You apply the ‘Bix Rule’ to evaluate the rhythm. What does the Bix Rule state?
Q14
The Osborn wave (J wave) is a distinct positive deflection at the J point, classically seen in severe hypothermia. At the cellular electrophysiological level, what causes the Osborn wave to appear?
Q15
In evaluating a patient with recurrent palpitations, you identify ‘Lown-Ganong-Levine (LGL) Syndrome’. How does the classical ECG presentation of LGL differ from Wolff-Parkinson-White (WPW) Syndrome?
Q16
A patient presenting with very early-stage acute STEMI has ECG changes predating ST-segment elevation. Which of the following describes the absolute EARLIEST electrocardiographic sign of acute transmural myocardial ischemia?
Q17
The presence of a ‘P-pulmonale’ pattern on an ECG indicates Right Atrial Enlargement (RAE). What is the strict electrocardiographic definition of P-pulmonale in the limb leads?
Q18
A 40-year-old patient with severe, untreated pulmonary hypertension is evaluated. To diagnose Right Ventricular Hypertrophy (RVH) on an adult ECG, what finding in the right precordial leads (V1) is considered diagnostic?
Q19
In differentiating ventricular arrhythmias, Idiopathic Right Ventricular Outflow Tract (RVOT) Ventricular Tachycardia is a common, often benign, adenosine-sensitive VT. What is its classic morphological presentation on a 12-lead ECG?
Q20
A patient with a dual-chamber permanent pacemaker has an ECG showing pacing spikes. If the pacemaker is functioning in a standard VVI mode (ventricular pacing, ventricular sensing, inhibited response), what relationship should the pacing spikes have with the native P waves?
Q21
During a sports physical, a healthy 18-year-old is diagnosed with Short QT Syndrome (SQTS). This highly lethal genetic channelopathy carries a high risk of sudden cardiac death. What QTc measurement cutoff conventionally defines SQTS in the presence of a normal heart rate?
Q22
An ECG artifact known as ‘Parkinsonian Tremor’ or ‘Toothbrush Artifact’ creates rapid, chaotic baseline oscillations that can perfectly mimic Ventricular Fibrillation or Atrial Flutter. How can you most reliably prove this is an artifact and not a lethal arrhythmia?
Q23
‘Commotio Cordis’ is a lethal cause of sudden cardiac death in young athletes. It occurs when a blunt, non-penetrating blow to the chest wall (e.g., a baseball strike) triggers Ventricular Fibrillation. For this to occur, the physical impact must strike exactly during which vulnerable phase of the cardiac cycle on the ECG?
Q24
When differentiating between Left Bundle Branch Block (LBBB) and Right Bundle Branch Block (RBBB) using lead V1, you observe a wide QRS complex with a distinct terminal deflection. According to the principle of appropriate discordance, how should the ST segment and T wave behave in relation to the terminal QRS deflection in an uncomplicated bundle branch block?
Q25