The Effects of Pre-extubation Single Recruitment Maneuver on Perioperative Atelectasis

In Group RM (intervention group) after skin closure, mechanical ventilation settings will be set to FiO2:100%, I:E=1:1, respiratory rate: 6, and then tidal volume will be increased gradually by 150 ml until reaching a plato pressure of 30 mmHg. After 3 breaths in this state, RM will be considered accomplished. LUS evaluation will be made just before and after the RM.