Ziad F. Issa on Twitter: "8/8 Apparent Mobitz type II AV block can also be caused by concealed junctional extrasystoles (confined to the specialized conduction system and not propagated to the myocardium)
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391. What determines QRS width in 3rd degree AV block? / Congenital vs. acquired 3rd degree AV block / Most common cause of a pause on ECG – emupdates
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