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. · Sep 1997
Randomized Controlled Trial Comparative Study Clinical TrialCapnography and ventilatory assessment during ambulatory dentoalveolar surgery.
The purpose of this study was to determine whether capnography is a more sensitive monitor than auscultation of breath sounds in detecting ventilatory changes consistent with hypoventilation, obstruction, or apnea and in detecting ventilatory changes that can be associated with oxygen desaturation. ⋯ Patients with nasal ventilatory exchange maintain this exchange throughout the anesthesia so that sampling of nasal PETCO2 is an effective way to monitor ventilatory status. Respiratory depression or obstructive ventilatory changes detected by capnography showed a high sensitivity and low positive predictive value in detecting oxygen desaturation. The current technology does not show a clinically satisfactory correlation between PETCO2 and oxygen saturation. However, a combined increase in PETCO2 and decrease in RR suggested a trend of decreasing oxygen saturation.