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The ability of patients with severe airflow limitation (forced expiratory volume in one second less than 1.0 l or peak expiratory flow rate less than 200 l.min.1) to use a new breath-actuated inhaler (BAI) was assessed. One hundred and fifty six patients attending two respiratory units entered and completed the study. Subjects were instructed how to use the device and after attempting to trigger the BAI had flow-volume loops measured. One hundred and fifty one (97%) were able to actuate the inhaler on their first (146) or second (5) attempt. The five unsuccessful patients did not have the most severe airways obstruction. It is concluded that this new device, which is actuated at low inspiratory flow rates, can be used by patients with severe airflow limitation and represents an important advance in inhaler technology.
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