Ventilation Mode and Atelectasis After Prone-Position Surgery: A Lung Ultrasound Study

This prospective single-centre observational study compared two intraoperative mechanical ventilation modes, volume-controlled ventilation (VCV) and VCV with AutoFlow/AF, in adults undergoing elective surgery in the prone position. The ventilation mode was selected by the attending anaesthesiologist as part of routine clinical care; the investigators did not assign it. Perioperative atelectasis was assessed using a modified bilateral 12-zone lung ultrasound score obtained before induction of anaesthesia and after extubation, and oxygenation was assessed using the alveolar-arterial oxygen gradient calculated from an intraoperative arterial blood gas sample. The study also examined whether the effect of ventilation mode on atelectasis differed according to obesity.

NCT Number	NCT07680881
Lead Sponsor	Prof. Dr. Cemil Tascıoglu Education and Research Hospital Organization
Conditions	Pulmonary Atelectasis, Postoperative, Postoperative Pulmonary Complications
Enrollment	90 participants
Start Date	2024-03-01
Primary Completion	2024-10-30 (estimated)
Study Completion	2024-10-30 (estimated)
Updated on ClinicalTrials.gov	2026-07-29