|Rate||normal or bradycardia|
|P wave||those present are 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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