“…Previously reported preoperative risk factors for SD are obesity [2][3][4][5][6][7][8], Diabetes mellitus (DM) [9], chronic obstructive pulmoner disease (COPD) [2][3][4][5][6][7][8][9], chronic cough [10], smoking [2,3], New York Heart Association (NYHA) functional class [11] , osteoporosis [1,2], use of acetylcholinesterase (ACE) inhibitors [10],use of ß-adrenergic drugs for respiratory problems [11], immunosuppression [2][3][4][5][6][7][8][9], and previous sternotomy [9] . Operative risk factors are bilateral internal mammary artery (IMA) harvest [9], excessive amounts of blood transfusion [11], off-midline sternotomy [12], and prolonged cardiopulmonary bypass (CPB) time [3].…”