2:1 AV block - A subtype of Second degree AV block

Figure 1

This is sinus rhythm, second degree AV block 2:1. This is often read as Mobitz II. However, 2:1 AV block is a subtype of second degree AV  block. A 2:1 AV block can either be due to a Mobitz I or Mobitz II mechanism. A longer strip is needed to capture the mechanism.

 

Figure 2

Scrolling back telemetry data reveled the mechanism as Mobitz II.

Other cases of 2:1 AV block - http://learningecg.blogspot.com/search/label/2%3A1%20AV%20block

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