Physiologic Effects of CPAP After Vascular Surgery

Inclusion Criteria: * Open or endovascular surgery on the abdominal aorta * Surgical procedure requiring general anaesthesia and invasive intraoperative mechanical ventilation * Intermediate-high risk of postoperative pulmonary complications (ARISCAT score ≥ 26) Exclusion Criteria: * Prolonged post-operative invasive ventilation * Invasive or non-invasive ventilation or oxygen therapy in the last month * ASA class IV or V * Emergency procedures * Pneumothorax or active pulmonary infection * Any contraindication to CPAP * Prolonged bed rest * Patient refusal to participate or to receive preventive CPAP