Forty COPD patients were admitted with an acute exacerbation and the patients were divided randomly into 2 equal groups: the first used the incentive spirometer together with medical treatment (according to GOLD guidelines) for 2 months and the second received only medical treatment for 2 months. All participants, on admission, underwent assessment of mMRC dyspnea scale, spirometry, arterial blood gases, and diaphragmatic ultrasound. Then, a follow-up of the participants was done after 2 months with the same parameters and a comparison between both groups was done.
