Abstract
To investigate the accuracy and usefulness of combined transcutaneous carbon dioxide (PtcCO2) and oxygen (PtcO2) measurement compared with arterial blood gas analysis (PaCO2 and PaO2), 10 patients undergoing laryngomicrosurgery under total intravenous anesthesia were studied. The PtcCO2 values revealed a high degree of correlation with PaCO2 during anesthesia (r=0.96) and after anesthesia (r=0.93). The PaO2 values revealed a generally good correlation with PaO2 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 PCO2 during and after anesthesia, in situations whereas continuous, precise control of CO2 levels is desired such as laryngomicrosurgery.
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