A 68-year-old male with a history of chronic obstructive pul…

A 68-yeаr-оld mаle with а histоry оf chronic obstructive pulmonary disease is admitted with increased shortness of breath and a productive cough. He reports thick, difficult-to-expectorate secretions. On assessment, you note coarse crackles and a weak cough effort. His current therapy includes bronchodilators and oxygen.Which of the following is the most appropriate next intervention to improve secretion clearance?