A 63-year-old man with chronic hypertensive atherosclerotic heart disease and stable anginal syndrome had complained of intermittent palpitations for the past 2 weeks. The palpitations were unrelated to activity or food intake. He was compensated and not on any routine cardiac drug therapy. Sublingual nitroglycerin promptly relieved his anginal episodes. The tracings in Figure 1 were recorded when he was seen initially.

  • 1. Which of the following interpretation(s) is/are correct?

    • upper tracing: sinus rhythm with complete left bundle branch block (LBBB) and ventricular premature beats causing retrograde atrial activation

    • lower tracing: Mobitz II second degree atrioventricular (AV) block

    • upper tracing: sinus rhythm with complete LBBB and His extrasystoles with slight aberrancy; blocked premature atrial beats

    • lower tracing: Mobitz II second degree AV block

    • upper tracing: sinus rhythm with complete LBBB; His extrasystoles with slight aberrancy; blocked sinus P wave...

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