Diagnostic criteria

  Sinus node cannot depolarize the atrium at the expected time. This results in a long isoelectric line between the last QRS complex before exit block and the first P wave coming after the exit block.

  The next sinus P wave comes at a
multiple of the previous PP intervals. This feature differentiates sinoatrial exit block from sinus arrest.


  Excessive vagal stimulation

  Myocardial infarction


  Drugs: Digoxin, Procainamide, Quinidine, Propafenone


  Bratisl Lek Listy 2004;105:14-17.

ECG 1. Sinoatrial exit block.

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

Click here for a more detailed ECG

ECG 2. Sinoatrial exit block.

Click here for a more detailed ECG