Our aim in this study is to compare fixed and individualized PEEP (driving pressure guided ) application for intraoperative lung protective ventilation in patients undergoing on-pump CABG surgery. Researcher aimed to compare the effects of two different PEEP application methods on intraoperative hemodynamics, respiratory mechanics, and gas exchange, as well as postoperative extubation times, respiratory complications (atelectasis, need for non invasive mechanical ventilatıon, need for re-entubatıon) length of stay in the intensive care unit, and discharge times.