| orthodeoxia | Fall in arterial blood oxygen upon assuming the upright posture. Usually due to right-to-left cardiac or vascular shunting with a posturally induced fall in left sided pressure permitting a corresponding gradient across the shunt. (05 Mar 2000) |
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| orthodeoxia |
accentuation of arterial hypoxemia in the erect position, improved by assumption of a recumbent position.
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