Effect of Preoxygenation Position and Examination Position on Hypoxemia During Painless Gastrointestinal Endoscopy

Starting soon · Not applicable

Conditions studied: Hypoxemia During Surgery

In brief

To investigate the independent effects and interaction of pre-oxygenation position (left lateral vs left lateral with 30° head-up tilt) and examination position (left lateral vs left lateral with 30° head-up tilt) on hypoxemia during painless gastroscopy and colonoscopy using a 2×2 factorial design.

Key facts

Study ID

NCT07673042

Run by

General Hospital of Ningxia Medical University

People needed

208

Starts

2026-06-23

Expected to finish

2026-08-31

Last updated by the study team

2026-06-29

Who can join

Age: 18 and older, up to 75. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Aged 18 to 75 years, regardless of gender
• Body mass index (BMI): 18.5 - 35 kg/m²
• ASA physical status class I, II or III
• Scheduled for painless gastroscopy, painless colonoscopy, or combined painless gastroenteroscopy
• Able to understand the study procedure and provide written informed consent

You may not qualify if…

• Severe cardiopulmonary diseases, including severe COPD, heart failure, severe arrhythmia and pulmonary hypertension
• Difficult airway identified before anesthesia
• Severe obstructive sleep apnea (OSA)
• Spinal or thoracic deformity
• Preoperative baseline hypoxemia
• Known allergy to any anesthetic drugs used in this study
• Pregnant females
• Unable to cooperate with required intraoperative body position

Where it is running

• General hospital of Ningxia medical university — Yinchuan, Ningxia, China

Full record on ClinicalTrials.gov

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