| acapnia | Less than the normal level of carbon dioxide in the blood. The opposite of hypercapnia. (12 Dec 1998) |
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| acapnial alkalosis | The alkalosis resulting from abnormal loss of CO2 produced by hyperventilation, either active or passive, with concomitant reduction in arterial plasma bicarbonate concentration. See: compensated alkalosis. Synonym: acapnial alkalosis. (05 Mar 2000) |