Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons
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J. Oral Maxillofac. Surg. · Jan 1992
Utility of capnography in predicting venous carbon dioxide partial pressure in sedated patients during outpatient oral surgery.
Twelve ASA class I patients scheduled for removal of third molars under intravenous sedation were included in the study. Samples for venous blood gas analysis were drawn every 5 minutes and the venous partial pressure of carbon dioxide was compared to the end-tidal CO2 recorded from a modified nasal cannula at the same time the samples were drawn. ⋯ The overall correlation between end-tidal CO2 and PVCO2 was .54 (P = .0001). The results of the investigation indicate that through simple modifications of the end-tidal CO2 monitoring device, the correlation between end-tidal CO2 and serum PCO2 in a nonintubated patient can be improved.