Second degree AV block natural history, complications and prognosis
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Raviteja Guddeti, M.B.B.S. [2]
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Natural History
- Mobitz I second degree AV block, usually most of the times, involves the Av node (70%). In about 30% of the cases the site of block is infranodal. It is usually benign and rarely progresses to complete heart block.
- Mobitz II second degree Av block is due to block inferior to the AV node (infra-Hisian structures) and it progresses to complete heart block.
Complications
Prognosis
Mobitz type I second degree AV block is usually benign and has a good prognosis compared to Mobitz type II. But Mobitz type I in the setting of an acute MI causes a significant rise in mortality. Mobitz II carries the risk of progression to complete heart block and carries an unfavorable prognosis.