Postoperative Atelectasis
Conditions
Keywords
Lung Ultrasound, Atelectasis, Supine Position, Prone Position, General Anesthesia, Perioperative Care
Brief summary
Atelectasis frequently develops during and after general anesthesia due to factors such as anesthesia-induced diaphragmatic dysfunction, reduced functional residual capacity, altered ventilation-perfusion matching, and surgical positioning. The development of atelectasis has been associated with postoperative hypoxemia and other pulmonary complications. Lung ultrasound (LUS) has emerged as a reliable, radiation-free bedside imaging modality for the detection and monitoring of atelectasis. LUS allows assessment of lung aeration through standardized ultrasound patterns and scoring systems, enabling dynamic evaluation in the perioperative period. This is a prospective, observational cohort study designed to compare the incidence and severity of atelectasis in patients undergoing surgery in the supine position versus the prone position under general anesthesia. Adult patients undergoing elective surgical procedures will be enrolled. No experimental intervention will be applied, and all anesthetic and surgical management will follow routine clinical practice. Lung ultrasound examinations will be performed at predefined time points after induction of anesthesia and before extubation. A standardized lung ultrasound protocol and scoring system will be used to assess lung aeration loss and detect the presence of atelectasis. The primary outcome of the study is the difference in atelectasis detected by lung ultrasound between supine and prone surgical positions. The secondary outcome is the change in lung ultrasound scores over time. This study aims to clarify the effects of supine and prone positions on perioperative atelectasis and to support the clinical use of lung ultrasound as a noninvasive monitoring tool in perioperative and anesthetic practice..
Interventions
None listed
Sponsors
Istanbul University - Cerrahpasa
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 80 Years
Healthy volunteers
Yes
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.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Difference in lung ultrasound-detected atelectasis between supine and prone surgical positions | Perioperative (After induction of general anesthesia and before extubation) | Lung aeration will be evaluated using the Lung Ultrasound Score (LUS), a semiquantitative scoring system assessing aeration loss in 12 lung regions. In the supine position, lung ultrasound assessment will be performed along: the parasternal line (intercostal spaces 1-4 and 4-8), the anterior axillary line (intercostal spaces 1-6 and 6-12), and the posterior axillary line (intercostal spaces 1-6 and 6-12). In the prone position, lung ultrasound assessment will be performed along: the paravertebral line (intercostal spaces 1-6 and 6-12), the posterior axillary line (intercostal spaces 1-6 and 6-12), and the anterior axillary line (intercostal spaces 1-6 and 6-12). Each lung region will be scored from 0 to 3, resulting in a total LUS ranging from 0 to 36, where higher scores indicate greater loss of aeration and more severe atelectasis. Assessments will be performed after induction of general anesthesia and before extubation. |
Countries
Turkey (Türkiye)
Contacts
PRINCIPAL_INVESTIGATORÖZLEM KORKMAZ DİLMEN, PROFESSOR
Istanbul University - Cerrahpasa
Outcome results
None listed