Study aims to prospectively evaluate if the pressures normally applied during mechanical ventilation in laparoscopic surgery induce stress on the pulmonary wall. To do this is used measure the variation of esophageal pressure, as indirect index of the pleural pressure and therefore of the transpulmonary pressure, in response to changes in airway pressures in a group of patients undergoing robotic assisted radical prostatectomy or videolaparoscopy.

Inclusion Criteria:

• ASA (american society of anesthesiologists) score ≤ III
• Patients underwent laparoscopic prostatectomy

Exclusion Criteria:

• BMI (body mass index) ≥ 30
• Impossibility to insert nasogastric tube
• Anatomic rib cage alterations

Patients underwent laparoscopic or robotic assisted radical prostatectomy