View source for McGill Case 288

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[[File:E288.jpg|thumb|600px|left|A 73 year old woman with dizziness.

2 to 1 AV block (every other P wave is conducted to the ventricles) 2 to 1 AV block starts after the 5th QRS in this 3 channel recording. The first non-conducted P wave is indicated with an arrow.
Note the long PR interval of conducted P waves is constant and the left bundle branch block
2 to 1 AV block cannot be classified into Mobitz type I or II as we do not know if the 2nd P wave would be conducted with the same or longer PR interval. 

with permision from the site of Dr. Dean Jenkins
 
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