Evaluation of an Auditory Feedback Equipped Metered Dose Inhaler

BACKGROUND: Although metered dose inhalers are one of the most frequently prescribed drug delivery systems for pulmonary disease, patients usually do not employ ideal technique when using these systems. We studied the effect of a new teaching device, the MDI Tutor (MDI Tutor Inc., Palatine, IL), on patients with unsatisfactory inhalation technique. METHODS: Twelve patients with an average of 10 years' experience with metered dose inhalers (mean age, 41 years) were evaluated by two observers. All patients had deficits in their inspiratory technique such as actuation of inhaler coordinating with the beginning of inhalation cycle, uninterrupted inhalation, and incorrect length of inspiration. Following evaluation, the patients were given metered dose inhalers equipped with a MDI Tutor prototype as well as written instructions on how to use the device most effectively. RESULTS: All patients corrected their inspiratory technique deficits. CONCLUSIONS: Equipping a metered dose inhaler with a MDI Tutor allows patients to rapidly recognize correct the errors in their inspiratory technique.