Chen JO, et al. - Whether the effectiveness of pulmonary rehabilitation program (PRP) after coronary artery bypass graft (CABG) surgery differs between patients with and without COPD, was determined by retrospectively comparing demographics, muscle strength, degree of dyspnea, pulmonary function and postoperative complications between both the patient groups. Patients who underwent emergency surgery, had an unstable hemodynamic status, were ventilator dependent or did not complete the PRP were excluded. A significant improvement in respiratory muscle strength and lung function was evident following PRP in patients with and without COPD who underwent CABG surgery. However, PRP was found to be more effective in improving peak expiratory flow and forced expiratory flow between 25% and 75% of vital capacity (FEF_25–75) in COPD patients.