subsidiary atrial pacemaker

Medical Dictionary

subsidiary atrial pacemaker sub·sid·i·ar·y atrial pacemaker (səb-sĭd'ē-ěr'ē)
A secondary source for rhythmic control of the heart, available for controlling cardiac activity if the sinoatrial pacemaker fails.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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