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openheart surgery

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open-heart surgery

[oh-puhn-hahrt]
–noun
surgery performed on the exposed heart while a heart-lung machine pumps and oxygenates the blood and diverts it from the heart.

Origin:
1975–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Science Dictionary
open-heart surgery  
Surgery in which the thoracic cavity is opened to expose the heart and the blood is recirculated and oxygenated by a heart-lung machine.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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