Sinus Pause
Let’s talk about sinus pause.
Sinus pause or arrest is characterized by a pause ≥2.0 seconds. It is due to transient failure of of impulse formation at the SA node.
Criteria
- Pause (P-P interval) ≥2.0 sec.
Note the regular PP interval with sinus P waves which is interrupted by a sinus pause with a duration of >2 seconds.
NOTE: Consider sinoatrial exit block if the pause is a “multiple” (2x, 3x, etc.) of the PP interval.
Possible causes:
- During sleep in normals
- Sinus node dysfunction
- Organic heart disease
- MI
- Hyperkalemia
- Drugs such as quinidine, digitalis, propafenone, etc.
- Others.
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