wandering atrial pacemaker
- wandering atrial pacemaker
- a condition in which the site of origin of the impulses controlling the heart rate shifts from one point to another within the atria, including the sinus node, changing with almost every beat. P waves and PR intervals vary, and the rate of impulse formation is somewhat irregular. It occurs when the rate of sinus impulses falls below a critical level or fails.
Medical dictionary.
2011.
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