Clinical Research Directory

Inclusion Criteria: * Patients scheduled for elective on-pump coronary artery bypass graft surgery via median sternotomy * Patients between the ages of 18 and 70 * ASA (American Society of Anesthesiologists) physical status classification II-III Exclusion Criteria: * Patients with an ejection fraction below 35% * Patients who did not consent to participate in the study * Patients undergoing emergency surgery * Patients who are allergic to the anesthetic drugs used * Patients who have undergone lung resection * Those with a history of mechanical ventilation in the 2 months before surgery * Patients who have undergone total circulatory arrest and deep hypothermia * Patients with obstructive sleep apnea syndrome requiring long-term ventilation assistance * Morbid obesity (Body Mass Index\>35kg/m2) * Patients with refractory hypoxemia (arterial oxygen saturation below 88% despite 100% oxygen inhalation) * COPD (FEV1\<70%) * Patients with chronic renal failure (serum creatine\>1.8 mg/dl) * Anemia (Hg\<10 gr/dl) * Patients who have had an intraaortic balloon pump placed.