Continuous Endotracheal Tube Cuff Pressure Monitoring and Postoperative Airway Complications in Laparoscopic Surgery

Endotracheal tube cuff pressure should be maintained between 20 and 30 cmH₂O to ensure adequate ventilation while preventing tracheal mucosal ischemia. Excessive cuff pressure may compromise tracheal mucosal perfusion and lead to postoperative airway complications such as sore throat, cough, hoarseness, dysphagia, and hemoptysis. In laparoscopic surgery, factors such as pneumoperitoneum, patient positioning, and the use of nitrous oxide may contribute to progressive increases in cuff pressure during anesthesia.

This prospective randomized controlled trial was conducted to evaluate the impact of different cuff pressure monitoring strategies on postoperative airway complications and tracheal mucosal injury in adult patients undergoing elective laparoscopic abdominal surgery. After obtaining ethical approval and written informed consent, patients were randomized into three groups according to the cuff pressure monitoring method used intraoperatively: cuff inflation using the cuff-leak technique (control group), intermittent cuff pressure monitoring with a manual manometer every 30 minutes, or continuous cuff pressure monitoring using a pressure transducer connected to the pilot balloon.

Cuff pressure in the monitored groups was maintained at approximately 25 cmH₂O throughout surgery. Postoperative laryngopharyngeal symptoms, including sore throat, cough, dysphagia, hoarseness, and hemoptysis, were assessed at postoperative hours 2 and 24 by a blinded observer. Tracheal mucosal changes were evaluated using fiberoptic bronchoscopy before extubation and graded according to established criteria.

The aim of the study was to determine whether continuous cuff pressure monitoring provides better control of cuff pressure and reduces postoperative airway complications and tracheal mucosal injury compared with intermittent monitoring and the cuff-leak technique.

Inclusion criteria

• Patients aged 18-65 years
• ASA physical status I-II
• Scheduled for elective laparoscopic abdominal surgery under general anesthesia
• Expected surgery duration longer than 90 minutes

Exclusion criteria

• Predicted difficult airway
• Recent upper respiratory tract infection
• Preoperative laryngopharyngeal symptoms
• Recent endotracheal intubation
• Body mass index > 40 kg/m²
• Substance abuse
• History of bronchospasm
• Tracheostomy
• History of laryngeal disease or laryngeal surgery
• ASA physical status ≥ III