The Effect of Airway and Chest Wall Oscillation on Respiratory Functions in COPD Patients in Acute Exacerbation

Inclusion Criteria: * Being classified as GOLD stage 3 or 4 based on spirometric evaluation in the medical history. * Having a hospital admission within the specified time frame, evaluated by a pulmonary specialist, and admitted to the pulmonary diseases service with a diagnosis of COPD exacerbation. * Being 40 years of age or older. * Voluntarily agreeing to participate in the study. Exclusion Criteria: * Having a hospital admission with a diagnosis of asthma attack in the last 5 years. * Monitoring suspicious focal points for pneumonia on lung radiology. * Hospitalization due to reasons other than exacerbation despite having a diagnosis of COPD. * Presence of pulmonary fibrosis or suspicious findings of fibrosis on radiology. * Systemic fungal infections. * Having cognitive impairment affecting the decision to participate in the study, such as confusion, orientation disorder, or dementia. * Patients with lung cancer or metastasis in the lungs. * Diagnosis of conditions provoking shortness of breath other than COPD exacerbation, such as pneumonia, pneumothorax, heart failure, and pulmonary embolism. * Presence of a new-onset rhythm disorder or ischemic changes requiring intervention on the EKG, excluding sinus tachycardia and multifocal atrial tachycardia. * Chronic kidney failure requiring hemodialysis. * Patients with conditions causing weakness in the lower extremities, such as arthritis, neurological disease, deep vein thrombosis, peripheral artery disease, muscle wea…