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A new probe for measurement of muscle pO2 and its use during cardiopulmonary bypass.

Results of recent studies have shown that skeletal muscle pO2 measurements provide an excellent index of peripheral tissue perfusion. Until recently, equipment required was large and difficult to operate. A small new disposable sensor was used upon ten patients during an open-heart bypass operation. Preliminary results clearly indicate a significant decrease in oxygen delivery to peripheral muscle tissue during nonpulsatile bypass. The miniature oxygen probe used in this study functioned well in providing continuous muscle pO2 levels. Not only can it be used to monitor muscle pO2 during total body bypass but also could be used readily in other areas, such as monitoring changes in tissue pO2 during surgical revascularization or during other clinical situations requiring critical care.