This observational study investigates the relationship between the duration of single-lung ventilation (SLV) and the incidence of postoperative pulmonary complications (PPCs) such as pneumonia, pneumothorax, hemothorax, acute lung injury, and acute respiratory distress syndrome (ARDS) in adult patients undergoing thoracic surgery. A total of 134 patients aged 18-85 years, scheduled for thoracic surgery requiring SLV, will be monitored. Data including SLV duration, perioperative parameters, and postoperative pulmonary outcomes will be analyzed.

Inclusion Criteria:

Age ≥18 years Undergoing thoracic surgery OLV planned during the procedure

Exclusion Criteria:

Pediatric patients Patients not requiring OLV Previous thoracic surgery

The study population will consist of adult patients aged 18 to 85 years who are scheduled to undergo thoracic surgery at Etlik City Hospital and require OLV during the procedure. Patients will be included if they meet the eligibility criteria of being over 18 years old, undergoing thoracic surgery, receiving intraoperative OLV, and providing informed consent to participate in the study. Patients will be excluded if they are part of the pediatric age group, do not require OLV, or decline participation. A total of 134 eligible patients will be prospectively enrolled and followed for seven days postoperatively to assess the occurrence of pulmonary complications.