Diagnostic criteria

  PR interval is fixed.

  Some P waves are not folllowed by a QRS complex.

  QRS complexes are generally wide (>120ms).

  The block is generally at the level of the bundle branches.


  Click here to go to 2:1 AV block.





ECG 1. Mobitz Type 2 second degree AV block. This is a 2:1 block and the presence of wide QRS complex supports the
diagnosis of Mobitz type 2 block. Of every 2 P wave s, only 1 is conducted to the ventricles.

Dr. Peter Kukla has donated this ECG to our website.

Click here for a more detailed ECG




ECG 2. Mobitz Type 2 second degree AV block. Some P waves are not conducted to the ventricles.

Dr. Andrew Krahn has donated this ECG to our website.

Click here for a more detailed ECG