Effect of Different Body Positions on Hypoxemia During Recovery in Patients Undergoing Painless Gastroscopy and Colonoscopy

Summary

Through a multicenter, three-arm randomized controlled trial design, this study aimed to compare the effects of three positioning strategies-side-lying with elevated head position, supine with elevated head position, and standard side-lying position-on the incidence of hypoxemia during the recovery phase in patients undergoing painless gastroscopy and colonoscopy. The goal was to provide clinicians with a simple, non-invasive, and cost-effective optimization strategy.

Conditions

• Postoperative Hypoxemia

Interventions

PROCEDURE

lateral decubitus head-up position (LH group)

An angle measuring device is placed beside the head of the examination bed to facilitate precise adjustment of the head position. Upon admission to the recovery room, the patient's Ramsay Sedation Scale score is assessed by an independent investigator (the attending anesthesiologist): 1 = agitated; 2 = fully awake, calm and cooperative; 3 = drowsy but responsive to verbal commands; 4 = drowsy but responsive to touch or pain; 5 = asleep but slow to respond to touch or pain; 6 = deep sleep with no response. Patients scoring 2-4 are immediately randomized into the study group, while those below this range are randomized after achieving the required score. Prior to enrollment, all patients remain in the left lateral position (bed head elevated 0°, consistent with the examination position). Patients assigned to the lateral supine head-elevated group (LH group) maintain their pre-assigned lateral position with the head elevated 30°.

PROCEDURE

supine head-up position (SH group)

An angle measuring device is placed beside the head of the examination bed to facilitate precise adjustment of the head position. Upon admission to the recovery room, the patient's Ramsay Sedation Scale score is assessed by an independent investigator (the attending anesthesiologist): 1 = agitated; 2 = fully awake, calm and cooperative; 3 = drowsy but responsive to verbal commands; 4 = drowsy but responsive to tactile or pain stimuli; 5 = asleep but slow to tactile or pain responses; 6 = deep sleep with no response. Patients scoring 2-4 are immediately randomized into the study group, while those below this range are randomized after achieving the required score. All patients are initially positioned in the left lateral decubitus position (head elevated at 0°, the same as during examination). Patients assigned to the supine head-elevated group (SH group) are transitioned from the lateral position to supine without a headrest, with the head elevated at 30°.

PROCEDURE

standard lateral decubitus position group (SL group)

An angle measuring device was placed beside the head of the examination bed to facilitate precise adjustment of the head position. Upon admission to the recovery room, the patient's Ramsay Sedation Scale was assessed by an independent investigator (the attending anesthesiologist): 1 = agitated; 2 = fully awake, calm and cooperative; 3 = drowsy but responsive to verbal commands; 4 = drowsy but responsive to touch or pain; 5 = asleep but slow to respond to touch or pain; 6 = deep sleep with no response. Patients scoring 2-4 were immediately randomized into the study group, while those below this range were randomized after achieving the required score. All patients were initially positioned in the left lateral decubitus position (head elevated at 0°, the same as during examination). Patients in the Standard Lateral Position Group (SL group) maintained their original left lateral position with the head elevated at 0°.

Sponsors & Collaborators

• Yinchuan Traditional Chinese Medicine Hospital

  collaborator UNKNOWN

• Guyuan Municipal People's Hospital

  collaborator UNKNOWN

• Wuzhong City People's Hospital

  collaborator UNKNOWN

• Zhongwei City People's Hospital

  collaborator UNKNOWN

• Shizuishan City People's Hospital

  collaborator UNKNOWN

• Zhongwei City Traditional Chinese Medicine Hospital

  collaborator UNKNOWN

• Pingluo County People's Hospital

  collaborator UNKNOWN

• Tongxin County People's Hospital

  collaborator UNKNOWN

• Yanchi County People's Hospital

  collaborator UNKNOWN

• Zhongning County People's Hospital

  collaborator UNKNOWN

• Lingwu City People's Hospital

  collaborator UNKNOWN

• Qingtongxia City People's Hospital

  collaborator UNKNOWN

• General Hospital of Ningxia Medical University

  lead OTHER

Principal Investigators

• Xinli Ni, Doctoral · 86-951-674-3252

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

SINGLE

Model

PARALLEL

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2026-05-12

Primary Completion

2026-12-31

Completion

2027-01-31

Countries

• China

Study Locations