Sinoatrial Block


 

Rate

Normal or bradycardia

P wave

When present P-waves are normal

QRS

Normal

Conduction

Normal

Rhythm

Basic rhythm is regular*.

*In a type I SA block, the P-P interval shortens until one P wave is dropped.

*In a type II SA block, the P-P intervals are an exact multiple of the sinus cycle, and are regular before and after the dropped P wave.

This usually occurs transiently and produces no symptoms. It may occur in healthy patients with increased vagal tone. It may also be found with CAD, inferior MI, and digitalis toxicity.


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