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sick sinus syndrome

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n.
Chaotic atrial activity characterized by an abnormally slow heartbeat punctuated by recurring ectopic beats and periods of an abnormally rapid heartbeat.
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Which of the following nouns has an irregular plural form?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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