(the PR interval gets longer and longer until a beat is finally dropped, or skipped).

Some patients are asymptomatic; those who have symptoms respond to treatment effectively. There is a low risk of a Mobitz I AV block leading to complete heart block or cardiac arrest.

Mobitz II

Mobitz II is caused by a sudden, unexpected failure of the His-Purkinje cells to conduct the electrical impulse. On ECG, the PR interval is unchanged from beat to beat, but there is a sudden failure to conduct the signal to the ventricles, and

1.Previous
3.Next