Use of end-tidalPco
2 and transcutaneousPco
2 as noninvasive measurement of arterialPco
2 in extubated patients recovering from general anesthesia |
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| Authors: | B P Kavanagh MB BSc Dr A N Sandler MB MSc K E Turner MD V Wick BScN S Lawson |
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| Institution: | 1. From the Department of Anaesthesia, University of Toronto, The Toronto Hospital, Toronto General Division, Toronto, Ontario, Canada
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| Abstract: | This study was designed to assess the accuracy of end-tidalPco 2 and transcutaneousPco 2 as measurements of arterialPco 2 in extubated, spontaneously breathing patients recovering from general anesthesia. In 30 patients, measurement of arterial transcutaneous, and end-tidalPco 2 were taken simultaneously with body temperature approximately every 15 minutes over a 2-hour period. ArterialPco 2 values were corrected for body temperature. Values for Paco 2 were compared with those forPetCO2 and Psco 2 by linear regression analysis and by calculation of bias ± precision. Thirty-six percent of the capnogram tracings obtained did not develop a plateau phase. We found poor correlation between end-tidal and arterialPco 2 regardless of the shape of the capnogram tracing, as well as poor correlation between transcutaneous and arterialPco 2. Although the measurements of bias and precision of noninvasivePco 2 monitors in this population are comparable to studies in other populations, we advise caution in relying on the routine use ofPetCO2 or Psco 2 for the noninvasive assessment of respiratory depression in extubated, spontaneously breathing patients recovering from general anesthesia. |
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