Effect of Different Bed Head Angles on Intraoperative Hypoxemia in Patients Undergoing Painless Gastroenteroscopy: A Prospective Randomized Controlled Study

NCT07594951 | Not Yet Recruiting

• 1 other identifier: 2026030569
• Study Type: interventional
• Target: 400
• Locations: 0 countries
• Sites: N/A

Brief Summary

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.

Conditions

Hypoxemia

Outcome Measures

Primary Outcomes (1)

• Hypoxemia

  Hypoxemia (75% \< SpO₂ \< 90% lasting \> 10 seconds and \< 60 seconds)

  During the procedure

Study Arms (2)

Group 15°

OTHER

Elevating the head of the bed to 15 degrees

Other: Elevating the head of the bed to 15 degrees

Group 0°

NO INTERVENTION

Interventions

Elevating the head of the bed to 15 degrees OTHER

Elevating the head of the bed to 15 degrees

Group 15°

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

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

You may not qualify if:

• Pregnancy
• Emergency examination or inadequate bowel preparation
• Baseline peripheral oxygen saturation (SpO₂) \< 95%
• Patient or family members refuse to participate in the study

Sponsors & Collaborators

• Xiangya Hospital of Central South University: lead

MeSH Terms

Conditions

Hypoxia

Condition Hierarchy (Ancestors)

Signs and Symptoms, Respiratory; Signs and Symptoms; Pathological Conditions, Signs and Symptoms

Central Study Contacts

XuZiHang ZiHangXu

CONTACT

15660571037; 995294055@qq.com

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: INVESTIGATOR, OUTCOMES ASSESSOR
• Purpose: PREVENTION
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: May 11, 2026
• First Posted: May 19, 2026
• Study Start: May 1, 2026
• Primary Completion (Estimated): July 1, 2026
• Study Completion (Estimated): July 1, 2026
• Last Updated: May 19, 2026

Record last verified: 2026-03

Data Sharing

• IPD Sharing: Will not share