Supine versus prone positioning during surgery and its effect on lung collapse (atelectasis)
Comparison of the Incidence of Atelectasis Assessed by Lung Ultrasound in Patients Undergoing Surgery in Supine and Prone Positions
Using lung ultrasound, researchers will see if adults having elective surgery under general anesthesia develop more or worse atelectasis when positioned on their back (supine) versus on their stomach (prone).
Quick facts
| Study type | Observational |
|---|---|
| Enrollment | 80 (estimated) |
| Ages | 18 Years to 80 Years |
| Sex | All |
| Sponsor | Istanbul University - Cerrahpasa Academic / other |
| Drugs / interventions | radiation |
| Locations | 1 site (Istanbul, Istanbul) |
| Trial ID | NCT07320092 on ClinicalTrials.gov |
What this trial studies
This is a prospective observational cohort comparing incidence and severity of perioperative atelectasis by lung ultrasound in adults undergoing elective surgery in either the supine or prone position under general anesthesia. Participants will receive bedside lung ultrasound examinations using standardized scoring before, during, and after surgery to document patterns of aeration loss. No experimental treatments are given; positioning is determined by the planned surgical procedure. Patients with emergency surgeries or severe pre-existing lung disease are excluded to avoid confounding ultrasound interpretation.
Who should consider this trial
Good fit: Adults aged 18 or older scheduled for elective surgery under general anesthesia in either the supine or prone position who can give informed consent and do not have severe baseline lung disease.
Not a fit: Patients having emergency operations, those with severe pre-existing pulmonary disease that affects ultrasound interpretation, or those not undergoing supine/prone procedures are unlikely to benefit from the study findings directly.
Why it matters
Potential benefit: If successful, results could help clinicians adjust positioning or perioperative care to reduce postoperative atelectasis and related breathing problems.
How similar studies have performed: Lung ultrasound is already validated as a reliable, radiation-free tool to detect and monitor atelectasis, but direct prospective comparisons of supine versus prone positioning under general anesthesia are limited.
Eligibility criteria
Show full inclusion / exclusion criteria
Inclusion Criteria: * Adult patients aged 18 years or older. * Patients scheduled for elective surgery under general anesthesia. * Patients undergoing surgery in the supine or prone position. * Patients able to provide informed consent. Exclusion Criteria: * Emergency surgical procedures. * Pre-existing severe pulmonary disease affecting lung ultrasound assessment. * Hemodynamic instability requiring urgent intervention. * Contraindications to lung ultrasound examination.
Where this trial is running
Istanbul, Istanbul
- Istanbul University-Cerrahpasa, Cerrahpasa Faculty of Medicine — Istanbul, Istanbul, Turkey (Türkiye) (Recruiting)
Study contacts
- Principal investigator: Özlem Korkmaz Di̇lmen, Professor — Istanbul University - Cerrahpasa
- Study coordinator: CHINARA NAMAZOVA, MD, Research Assistant
- Email: chinara.namazova@iuc.edu.tr
- Phone: +90 554 174 87 91
How to participate
- Review the eligibility criteria above with your treating physician.
- Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
- Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.