Bronchial asthma is one of the most common respiratory disorders with significant morbidity and mortality. Patients with asthma experience declined lung function. Among patients with asthma, forced expiratory volume in 1 second (FEV1), forced vital capacity (FVC), and FEV1/FVC ratio were found to be lower than in age- and height-matched healthy individuals.1 To arrest the decline in ventilatory function is one of the major objectives of management of asthma.
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