Evaluation of the Effectiveness and Safety of Vibro-acoustic Pulmonary Therapy (VAPT) in Complex Therapy for Acute Respiratory Failure of Mixed Type I-II Stages in Comparison With Percussion Massage in Cardiac Surgical Patients in the Early Postoperative Period

This study compares two chest physiotherapy techniques — vibro-acoustic pulmonary therapy (VAPT) versus traditional percussion massage — for clearing mucus from the lungs in patients who develop breathing problems after open-heart surgery. **You may be eligible if...** - You are between 18 and 80 years old - Your BMI is between 18.5 and 35 - You underwent planned cardiac (heart) surgery under general anesthesia using a heart-lung machine (lasting more than 3 hours) - You developed a moderate breathing problem after surgery (oxygen levels below 95% while breathing normal air) - Your heart's pumping function before surgery was above 40% - Your vital signs are stable after surgery **You may NOT be eligible if...** - Your breathing problem was severe before or during surgery - You have had a recent heart attack or severe bleeding - You required emergency surgery or have other serious post-operative complications Talk to your doctor to see if this trial is right for you.