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subsidiary atrial pacemaker

[ səb-sĭdē-ĕr′ē ]
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n.

A secondary source for rhythmic control of the heart, available for controlling cardiac activity if the sinoatrial pacemaker fails.

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

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