To investigate the accuracy and usefulness of combined transcutaneous carbon dioxide (PtcCO
2) and oxygen (PtcO
2) measurement compared with arterial blood gas analysis (PaCO
2 and PaO
2), 10 patients undergoing laryngomicrosurgery under total intravenous anesthesia were studied. The PtcCO
2 values revealed a high degree of correlation with PaCO
2 during anesthesia (r=0.96) and after anesthesia (r=0.93). The PaO
2 values revealed a generally good correlation with PaO
2 during anesthesia (r=0.81), but not after anesthesia (r=0.23). Capnography values are invalid after anesthesia, and an arterial catheter is not always indicated and feasible in microlaryngoscopy. Transcutaneous devices provide an effective method for the non-invasive monitoring of PCO
2 during and after anesthesia, in situations whereas continuous, precise control of CO
2 levels is desired such as laryngomicrosurgery.
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