Sinoatrial Block

Rate normal or bradycardia
P wave those present 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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