Background: Coronary Artery Disease (CAD) leads to significant respiratory, medical, and physical complications, adversely affecting the Quality Of Life (QoL). The Quake device, a member of the Oscillatory Positive Expiratory Pressure (OPEP) family, may offer health benefits for patients with CAD; however, further research is required.

Aim of the Study: This study aimed to examine the effects of intrathoracic oscillations on arterial blood gases following Coronary Artery Bypass Graft (CABG) surgery. Patients and Methods: The study included 60 male patients aged 55–65 years who underwent CABG surgery at 6 October Hospital. Participants were randomly divided into two equal groups: Group A received therapy using the Quake OPEP device in addition to conventional physiotherapy and standard medical treatment. Group B received only traditional physiotherapy and prescribed medical care. Both groups received their respective treatments once daily from the first to the seventh postoperative day. Patients were evaluated using Arterial Blood Gas (ABG) analysis, the sit-to-stand test, and the SF-36 Quality of Life questionnaire.

Results: Both groups showed significant improvement in ABG parameters (pH, PaO₂, PaCO₂, and HCO₃), sit-to-stand performance, and SF-36 scores when comparing pre- and post-treatment results. However, Group A demonstrated statistically superior improvements in all post-treatment measures compared to Group B.

Conclusion: Early rehabilitation following CABG surgery using the Quake device may enhance ABG values and functional capacity, ultimately contributing to an improved quality of life.

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