Abstract:

Objective: This study aimed to investigate the effect of different bed angles (0° vs. 15°) on the incidence of intraoperative hypoxemia in patients undergoing gastroscopy and colonoscopy. A prospective randomized controlled trial was conducted to evaluate the impact of patient positioning on respiratory safety, providing evidence for individualized anesthesia management.

Background:

With the increasing popularity of painless gastrointestinal endoscopy, hypoxemia has become a major safety concern in anesthesia management, particularly in elderly and obese patients. Studies have shown that the incidence of hypoxemia can exceed 26%, highlighting the importance of optimizing respiratory safety during anesthesia.

Methods:

A total of 400 patients scheduled for painless gastrointestinal endoscopy were recruited and randomly assigned to a control group (0° left lateral position) or an experimental group (15° left lateral position). Baseline data were recorded preoperatively. Intraoperative vital signs were monitored, and the occurrence of hypoxemia and other complications was documented. Data were collected and processed in a blinded manner, followed by statistical analysis using SPSS 26.0.

Inclusion Criteria:

1. Age ≥ 18 years
2. Planned to undergo painless (sedated) gastrointestinal endoscopy
3. Signed informed consent form
4. American Society of Anesthesiologists (ASA) Physical Status classification I to III

Exclusion Criteria:

1. Pregnancy
2. Emergency examination or inadequate bowel preparation
3. Baseline peripheral oxygen saturation (SpO₂) < 95%
4. Patient or family members refuse to participate in the study

We currently have no plan to share individual participant data (IPD). The data belong to the institution as proprietary resources and are exclusively reserved for internal use. Access to the data can only be considered under specific institutional agreements and with proper authorization.