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Updated: Jun 23, 2026

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
Published on: December 6, 2016
Effects of sedation during upper gastrointestinal endoscopy on arterial oxygen saturation
Ramin Talaie1, Mehdi Haydari Monfared, Homayoun Zojaji
1Research Center for Gastroenterology and Liver Disease, Shahid Beheshti University of Medical Sciences, Tehran, Iran. swt_f@yahoo.com
Background/Aims:
Determination of optimal administered sedatives during endoscopy is vital and necessary for the minimization of their side effects. This study was designed to see the effect of sedation on endoscopy induced arterial oxygen desaturation and determination of sedatives safety during gastrointestinal endoscopy.
Methodology:
In this controlled clinical trial, 90 consecutive patients scheduled for diagnostic upper gastrointestinal endoscopy were categorized into 2 groups (45 in each group). The patients in the first group were sedated with midazolam 0.1 mg/kg, propofol 1 mg/kg and fentanyl 1 microg/kg intravenously, while the patients in the second group received saline as a placebo. In both groups, blood pressure, heart rate, and arterial oxygen saturation were measured before and one minute after endoscopy, and compared.
Results:
No significant differences were found in arterial O2 saturation (p = 0.142) and heart rate (p = 0.154) between the two groups, one minute after endoscopy. Both systolic and diastolic blood pressures were higher in non-sedated group (p < 0.001).
Conclusion:
Concomitant administration of midazolam, propofol, and fentanyl do not cause arterial desaturation, however, it can lead to blood pressure changes one minute after the beginning of endoscopy.
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