Why the study?
Can His bundle electrography localize the site of block in patients with Mobitz type II AV block and narrow QRS?
Can His bundle electrography localize the site of block in patients with Mobitz type II AV block and narrow QRS?
His bundle electrography can localize Mobitz type II AV block with narrow QRS to the distal His bundle segment.
His bundle electrography may localize narrow-QRS Mobitz II block to distal His; hypothesis-generating and should not yet change practice.
Two patients with second-degree A V block and narrow QRS were studied by His bundle electro- graphy. The first patient had Mobitz type II A V block on the standard electrocardiogram but showed 2:i AV conduction when His bundle electrograms were recorded. Intravenous atropine increased the atrial rate but 2: i A V conduction persisted. The block was localized distal to His bundle activity and was thought to be in the distal His bundle segment.
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Gupta et al. (1972) studied this question.
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