We studied arterial oxygen desaturation, using a pulse oximeter, in 132 patients undergoing diagnostic upper gastrointestinal endoscopy to obtain predictive factors of the change. The baseline arterial oxygen saturation (SaO2) level was
98.8±1.2%.
During the procedure, oxygen desaturation (SaO2>95%) was found in 90.2% of the patients. Mild oxygen desaturation (95>SaO2>90%) was found in 9.8% of the patients, and there was no severe oxygen desaturation(SaO2<90%). Age(P=0.52), gender(P=0.48),
smoking(P=0.71), body mass index(P=0.32), and endoscopy time(P=0.68) was not related to the degree of oxygen desaturation. These results suggest that oxygen desaturation, which may rarely induce serious cardiopulmonary events, is not frequently
observed
during non-sedated diagnostic upper endoscopy. (Kor J Gastrointest Endosc 16::25~29, 1996)
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