Comparing Endotracheal Tube Cuff Pressure in Laparoscopic Abdominal Surgery: Saline vs. Air Inflation

In this study, the investigators aim to compare the incidence of cuff pressure increase between endotracheal tubes inflated with air or saline during elective laparoscopic abdominal surgery under general anesthesia with N2O. This prospective observational study will be conducted on 60 patients aged 18-65 with ASA physical status I-II undergoing elective laparoscopic abdominal surgery under general anesthesia. Patients are randomly assigned to two groups: one group has tubes inflated with air (Group H, n=30), while the other group has tubes inflated with saline (Group S, n=30). The cuff pressure is continuously monitored using a pressure transducer attached to the cuff via a three-way tap. Anesthesia maintenance is achieved with sevoflurane and oxygen/N2O (%40/%60) in both groups. The intervention is performed whenever the cuff pressure exceeds 20 mmHg for \>30 seconds during the CO2 insufflation of the abdomen, and the pressure is reduced. The number of interventions is recorded as the primary outcome of the study. The cuff pressure is measured before and after insufflation and after the patients are placed in Trendelenburg and reverse Trendelenburg positions.