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Introduction: Coronary artery bypass graft (CABG) is the primary surgical process to reduce mortality in patients with coronary artery disease. Atelectasis, as the most important pulmonary complication, postpones the recovery period. One of the most innovative methods for preventing atelectasis is continuous positive airway pressure (CPAP). 
Objective: The present study evaluated the effect of adding CPAP to the cardiac rehabilitation program after CABG on exercise and respiratory parameters.
Materials and Methods: This research was a randomized clinical trial conducted on 40 patients of two intervention groups (20 patients) and control (20 patients) after CABG. They were randomly assigned with four block randomizations to receive CPAP mask besides incentive spirometry (IS) in the intervention group or only IS in the control group. Data collection tools were demographic information, modified Borg scale 10, exercise, and respiratory parameters. Participants were assessed from the first to the fourth days of the study. The repeated measures analysis of covariance, t-test, Mann-Whitney test, and multivariate analysis of covariance were used for data analysis.
Results: There were 17 men and 3 women in the intervention group and 12 men and 8 women in the control group. Their Mean±SD age was 59.80±9.54 years in the intervention and 54.45±11.32 years in the control group. From the first to the third day, the values of dyspnea (P=0.001), leg effort (P=0.001(, walking time (P=0.001), and peripheral oxygen saturation before and after walking (P=0.001) were statistically significant in both groups. Considering the group effect, dyspnea (P=0.002), leg effort (P=0.001), walking time (P=0.001), and peripheral oxygen saturation before and after walking (P=0.001) were significant between the two groups. Considering the group and time effect, the tidal volume (P=0.001), minute ventilation (P=0.006), forced vital capacity (P=0.001), forced expiratory volume in one second (P=0.001), and peak expiratory flow (P=0.001) were significant. 
Conclusion: Adding a ventilation assist gadget featuring CPAP to cardiac rehabilitation programs may improve the exercise and respiratory parameters after CABG.

Keywords: Coronary artery bypasses graft (CABG), Atelectasis, Incentive spirometry, Continuous positive airway pressure

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