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Department of Anesthesiology, Nagasaki University School of Medicine, Nagasaki, Japan
Address correspondence and reprint requests to Sungsam Cho, MD, Department of Anesthesiology, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan. Address e-mail to chos{at}net.nagasaki-u.ac.jp
We performed this study to assess the accuracy of transcutaneous CO2 (PTCCO2) monitoring compared with end-tidal CO2 (PETCO2) in thoracic anesthesia. Twenty-six patients undergoing pneumonectomy with thoracotomy for which a long period of one-lung ventilation (OLV) was required were studied. The lungs were mechanically ventilated in the lateral decubitus position. PTCCO2, PETCO2, and arterial CO2 (PaCO2) were simultaneously measured during two-lung ventilation (TLV) and during OLV at intervals of 15 min. All patients completed the study protocol. Bland-Altman analysis revealed a bias of -0.4 mm Hg with a precision of ±2.5 mm Hg during OLV and 1.4 mm Hg with ±4.3 mm Hg during TLV when PTCCO2 and PaCO2 were compared and revealed a bias of -5.8 mm Hg with a precision of ±4.1 mm Hg during OLV and -7.1 mm Hg with ±4.6 mm Hg during TLV when PETCO2 and PaCO2 were compared. We conclude that PTCCO2 monitoring is accurate for evaluating CO2 levels during thoracic anesthesia.
IMPLICATIONS: Our study indicates that transcutaneous CO2 is more accurate than end-tidal CO2 during either two- or one-lung ventilation in thoracic anesthesia.
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