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.