For the analysis of any clinical trial on asthma inhalers, your efficacy parameters are most probably going to be related to the spirometry measures and will almost always include the following FEV1 - Forced expiratory volume in 1 second The FEV1 is the volume exhaled during the first second of a forced expiratory maneuver started from the level of total lung capacity.
PEF - Peak expiratory flow Expiratory peak flow (PEF) is the maximum flow generated during expiration performed with maximal force and started after a full inspiration .
FVC - Forced expiratory vital capacity The volume change of the lung between a full inspiration to total lung capacity and a maximal expiration to residual volume. Here are more details on Spirometry. Also check out GINA for more Asthma information
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