1 MCQs in Medicine for NEET PG
A 72-year-old man with acute anterior ST-elevation myocardial infarction (STEMI) due to proximal LAD occlusion presents with syncope, hypotension (96/58 mmHg), and bradycardia (42 bpm). His 12-lead ECG shows ST elevation in V1–V4 with new left bundle branch block. The rhythm strip marked **B** demonstrates P waves occurring at a regular atrial rate of 88/min, but intermittently a P wave is followed by NO QRS complex. The PR interval on all conducted beats is constant at 180 ms, and the QRS complexes are wide (140 ms) with LBBB morphology. There is NO progressive PR prolongation before the dropped beats. What is the underlying pathophysiological mechanism of the conduction disturbance shown in rhythm strip **B**?
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