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Background: The initial days following CABG is a crucial period as it imposes a high risk of pulmonary complications and morbidity. In an effort to increase lung volume following surgery, various deep breathing manoeuvres have been implemented as a main component in the care of the postoperative patient. The rationale for Deep Breathing Exercises with PEP and Incentive Spirometry is that they prevent postoperative complications (PPC), thereby improving cardiorespiratory function. Various studies to substantiate the effectiveness of Deep Breathing Exercises with PEP devices and Incentive Spirometry on preventing pulmonary complications following CABG surgery have been done. The need to study immediate effects of both techniques is yet to be studied. Methodology: 30 subjects undergoing CABG and fulfilling the inclusion criteria were selected for the study. They were randomly assigned into two groups …