Transcutaneous oxygen monitoring of critically ill adults, with and without low flow shock

Critical Care Medicine
K K Tremper, W C Shoemaker


One hundred and six critically ill adult patients were monitored continuously with a transcutaneous oxygen sensor (PtcO2); they also were intermittently monitored with conventional invasive hemodynamic and oxygen transport variables. A total of 1073 data sets were taken on 41 patients in the ICU and 65 patients in the operating room. The patients were divided into three groups by cardiac index (CI): relatively normal flow, CI greater than 2.2 L/min x M2; moderate low flow shock, 2.2 greater than CI greater than 1.5 L/min x M2; and severe low flow shock, CI less than 1.5 L/min x M2 x PtcO2 and arterial oxygen tension (PaO2) were compared in two ways: first by linear regression and second by a more simple clinical guide by indexing each transcutaneous value by its respective arterial value (PtcO2 index = PtcO2/PaO2). For 934 data sets taken on 92 patients not in shock, there was a correlation coefficient (r) of 0.89 and a PtcO2 index 0.79 +/- 0.12 (SD). In 5 patients with moderate shock, the r was 0.78 and the PtcO2 index was 0.48 +/- 0.07. In 9 patients with severe shock, there was no correlation between PtcO2 and PaO2 and the PtcO2 index was 0.12 +/- 0.12. In all cases of severe shock, the PtcO2 value responded quickly to chang...Continue Reading


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Blood Flow Velocity
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