Effects of Respiratory Muscle Training on Postoperative Pulmonary Complications of Cardiac Surgery

Inclusion Criteria: * High-risk patients underwent primary elective CABG (Coronary artery bypass graft), High-risk will be defined as 2 or more the following: age\>70 years; cough and expectoration; diabetes; smoker; COPD (Chronic Obstructive Pulmonary Disease) Exclusion Criteria: * Uncontrolled arrhythmia, * Decompensated heart failure, * Unstable angina upon selection or during the inspiratory muscle training (IMT), * Need for reoperation and association of another procedure during surgery (e.g. valve correction associated with CABG) * Severe orthopedic or neurological conditions.