The aim of this study is to prospectively evaluate the effect of surgical position on the development of postoperative atelectasis in patients undergoing surgery in supine, prone, lateral decubitus, and lithotomy positions using lung ultrasonography (LUS), and to investigate whether there is a difference between these positions.
Who can participate
Age range
18 Years – 65 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria:
* Being between 18-65 years of age
* Having ASA I-III status
* Planning elective surgery under general anesthesia
* Agreeing to participate in the study and signing the consent form
Exclusion Criteria:
* Patients requiring emergency surgery
* Patients with ASA IV or higher
* Presence of a known serious preoperative lung disease (COPD, Asthma, Pneumonia, Pleural effusion, Pneumothorax, Interstitial lung disease, Bronchiectasis, etc.)
* History of neuromuscular disease
* Body Mass Index (BMI) \> 35 kg/m² (Morbid obesity)
* Presence of chest wall deformity or skin lesions that would obstruct LUS imaging
* Cases with an operative duration of less than 60 minutes or more than 300 minutes
* Patients with a history of thoracotomy, sternotomy, or prior open thoracic surgery
* Patients with alcohol or drug dependence
* Patients with significant anemia
* Patients who are pregnant or lactating
* Patients who develop laryngospasm following extubation
* Refusal to provide consent or inability to cooperate
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Modified Lung Ultrasound Score
Timeframe: 1. (T0):Immediately before anesthesia induction, in the supine position 2.(T1): Immediately before the patient is awakened, in the supine posit 3.(T2):Twenty minutes after the patient was admitted to the PACU (Post-Anesthesia Care Unit)