HypoxemiaNCT07594951
Effect of Different Bed Head Angles on Intraoperative Hypoxemia in Patients Undergoing Painless Gastroenteroscopy: A Prospective Randomized Controlled Study
A study testing Elevating the head of the bed to 15 degrees in people with Hypoxemia, run by Xiangya Hospital of Central South University at 1 site in China.
Trial 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. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Hypoxemia
- What is being tested?
- Elevating the head of the bed to 15 degrees
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 400 participants
- Where
- 1 siteChina
- Study dates
- 15 Mar 2026to 1 Jun 2026
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- 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
Who cannot join
- Pregnancy
- Emergency examination or inadequate bowel preparation
- Baseline peripheral oxygen saturation (SpO₂) < 95%
- Patient or family members refuse to participate in the study
Trial locations and contacts
1 site in 1 country.
China1 site
Xiangya Hospital of Central South University
Changsha, Hunan, 410000
About this study
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.
Read more
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
- Being tested
- Elevating the head of the bed to 15 degrees
- Medical subject headings
- Hypoxia
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Elevating the head of the bed to 15 degreesOther
Elevating the head of the bed to 15 degrees
| Study group | Role | What they receive |
|---|---|---|
| Group 15° | Other | Elevating the head of the bed to 15 degrees Receives: Other: Elevating the head of the bed to 15 degrees |
| Group 0° | No intervention | Not described |
What is being measured
The primary outcome is the main question the study is designed to answer.
Hypoxemia
Hypoxemia (75% < SpO₂ < 90% lasting > 10 seconds and < 60 seconds)
Measured: During the procedure
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted19 May 2026
- Study start15 Mar 2026
- Primary completion1 Jun 2026
- Study completion1 Jun 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for HypoxemiaStudies of the same condition, open and under way.
- More trials run by Xiangya Hospital of Central South UniversityThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind
- Who is masked
- Investigator, Outcomes assessor
- Enrolment
- 400 participants (actual)
Sponsor and investigators
- Lead sponsor
- Xiangya Hospital of Central South University
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07594951
- Sponsor's protocol ID
- 2026030569
- Status last verified
- Mar 2026
- First submitted
- 11 May 2026
- Last updated
- 26 Oct 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: 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.
Study at a glance
From the registry record, last updated by the sponsor on 26 Oct 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effect of Different Bed Head Angles on Intraoperative Hypoxemia in Patients Undergoing Painless Gastroenteroscopy: A Prospective Randomized Controlled Study
- ClinicalTrials.gov ID
- NCT07594951
- Acronym / sponsor ID
- 2026030569
- Conditions
- Hypoxemia
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 400 participants (actual)
- Lead sponsor
- Xiangya Hospital of Central South UniversityUniversity, hospital or other
- Study start
- 15 Mar 2026 (actual)
- Primary completion
- 1 Jun 2026 (actual)
- Study completion
- 1 Jun 2026 (actual)
- First posted
- 19 May 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind (investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Group 15° | Other | Other: Elevating the head of the bed to 15 degreesElevating the head of the bed to 15 degrees |
| Group 0° | No intervention | – |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- 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
Key exclusion criteria (4 listed)
- Pregnancy
- Emergency examination or inadequate bowel preparation
- Baseline peripheral oxygen saturation (SpO₂) < 95%
- Patient or family members refuse to participate in the study
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Elevating the head of the bed to 15 degreesElevating the head of the bed to 15 degrees | Other | Group 15° |
Primary outcome
Hypoxemia
Time frame: During the procedure
Hypoxemia (75% < SpO₂ < 90% lasting > 10 seconds and < 60 seconds)
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 26 Oct 2026.
- Individual participant dataSharing planned: No. 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.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Elevating the head of the bed to 15 degrees in people with Hypoxemia, run by Xiangya Hospital of Central South University at 1 site in China.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 26 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Hypoxemia (time frame: During the procedure). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 26 Oct 2026.