This study aims to evaluate peak airway pressure and respiratory mechanics during pressure-regulated volume control (PRVC) ventilation in patients undergoing elective laparoscopic abdominal surgery. Pneumoperitoneum and patient positioning during laparoscopic procedures can significantly affect respiratory mechanics, including airway pressures and lung compliance.

The study will assess changes in peak airway pressure, dynamic compliance, and other ventilatory parameters during different intraoperative phases. The findings are expected to provide insights into optimizing ventilatory strategies to improve patient safety and minimize ventilator-associated complications during laparoscopic surgery.

Laparoscopic abdominal surgery requires the creation of pneumoperitoneum, which increases intra-abdominal pressure and affects respiratory system mechanics. These changes can lead to increased peak airway pressure and reduced lung compliance, potentially increasing the risk of ventilator-induced lung injury.

Pressure-regulated volume control (PRVC) ventilation is designed to deliver a set tidal volume with the lowest possible airway pressure by adjusting inspiratory pressure dynamically. However, its performance during laparoscopic procedures and its effect on respiratory mechanics require further evaluation.

This prospective observational study will be conducted on adult patients undergoing elective laparoscopic abdominal surgery under general anesthesia. Standardized anesthesia and ventilation protocols will be applied. Respiratory parameters including peak airway pressure, tidal volume, respiratory rate, and dynamic compliance will be recorded at predefined time points: after induction, after pneumoperitoneum, and at steady-state intraoperative conditions.

The primary outcome will be peak airway pressure. Secondary outcomes include dynamic compliance and other ventilatory parameters. The study aims to enhance understanding of respiratory mechanics during PRVC ventilation and support evidence-based optimization of intraoperative ventilation strategies.

Inclusion Criteria:

• Adult patients aged 18-65 years
• Scheduled for elective laparoscopic abdominal surgery under general anesthesia
• ASA physical status I-II
• Patients requiring mechanical ventilation using PRVC mode
• Provided informed consent

Exclusion Criteria:

• Patients with significant cardiopulmonary disease
• Chronic obstructive pulmonary disease or restrictive lung disease
• Morbid obesity (BMI > 35 kg/m²)
• Pregnancy
• Emergency surgeries
• Patients with anticipated difficult airway
• Refusal to participate

Adult patients undergoing elective laparoscopic abdominal surgery under general anesthesia at a tertiary care center.

No, individual participant data (IPD) will not be shared.