Selective acidosis in venous blood during human cardiopulmonary resuscitation

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Abstract
During experimental CPR, a marked venoarterial gradient in PCO2 has been reported. This is accompanied by a disproportionate decrease in venous pH and a simultaneous increase in arterial pH. This study includes a case report of human CPR in which simultaneous arterial and mixed venous blood gases were obtained before and after cardiac arrest. Similar venoarterial PCO2 gradients were observed subsequently in six additional patients during arrest. These clinical data indicate that arterial blood gases fail to reflect striking increases in venous PCO2 and decreases in pH due to respiratory acidosis on the venous side of the circulation.

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