An initial evaluation of the safety of a disposable oscillating positive expiratory pressure device in patients with chronic obstructive pulmonary disease: A short-term pilot study

Handheld oscillating positive expiratory pressure (OPEP) devices have been a mainstay of treatment for patients with hypersecretory conditions such as cystic fbrosis (CF) and chronic obstructive pulmonary disease (COPD) since the 1970s.