I. Bifascicular Block and Second Degree AV Block
II. Second Degree AV Block with Narrow QRS complexes
· The block is located within the AV node or the His bundle
· The vast majority is in the AV node and is usually benign
· Type I AV block (Wenckebach periodicity) confirms AV nodal block
· Even if the AV block appears to be type II, it is most likely localized within the AV node and is usually benign (“pseudo-type II AV block”)
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