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

Status

Not yet recruiting

Phases

Unknown

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT07594951

Enrollment

400

Registered

2026-05-19

Start date

2026-05-01

Completion date

2026-07-01

Last updated

2026-05-19

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Hypoxemia

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.

Interventions

OTHERElevating the head of the bed to 15 degrees

Elevating the head of the bed to 15 degrees

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

PREVENTION

Masking

DOUBLE (Investigator, Outcomes Assessor)

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

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

Design outcomes

Primary

Measure	Time frame	Description
Hypoxemia	During the procedure	Hypoxemia (75% \< SpO₂ \< 90% lasting \> 10 seconds and \< 60 seconds)

Contacts

CONTACTXuZiHang ZiHangXu

995294055@qq.com15660571037

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: May 20, 2026