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breath-holding test

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n.
A test used as a rough index of cardiopulmonary reserve, measured by the length of time a person can hold his or her breath. Diminished cardiac or pulmonary reserve is indicated if one's breath is held for less than 20 seconds.
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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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