Sinus Arrest

Rate normal
P wave those that are present are normal
QRS normal
Conduction normal
Rhythm The basic rhythm is regular. The length of the pause is not a multiple of the sinus interval.

This may occur in individuals with healthy hearts. It may also occur with increased vagal tone, myocarditis, MI, and digitalis toxicity.

If the pause is prolonged, escape beats may occur.

The treatment of this dysrhythmia depends on the underlying cause.

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Atropine should never be used to treat sinus arrest.

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