52 MCQs in Medicine for NEET PG
In second-degree AV block Mobitz type I (Wenckebach), which of the following best describes the ECG finding?
A 72-year-old Indian man with chronic hypertension and diabetes presents with progressive dyspnea and syncope. ECG shows second-degree AV block type II (Mobitz II). Which is the most common cause of Mobitz II AV block in the chronic setting?
A 68-year-old man with acute inferior wall myocardial infarction presents with progressive bradycardia and hypotension. ECG shows a regular ventricular rhythm of 40 bpm with P waves marching through the QRS complexes at a rate of 100 bpm. Which of the following is NOT a characteristic feature of complete heart block (third-degree AV block)?
Which ECG finding best distinguishes second-degree AV block type I (Wenckebach) from second-degree AV block type II (Mobitz II)?
A 72-year-old woman with a history of hypertension and diabetes presents with syncope. ECG shows complete heart block (third-degree AV block) with a ventricular escape rate of 35 bpm. After initial stabilization with temporary pacing, what is the drug of choice for long-term management while awaiting permanent pacemaker insertion?
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