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orthodeoxia

Pronunciation: or'tho-de-oks'e-a

Definition: Fall in arterial blood oxygen on assuming the upright posture. Usually caused by right-to-left cardiac or vascular shunting with a posturally induced fall in left-sided pressure permitting a corresponding gradient across the shunt.

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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