The principal objective is to show noninferiority of nebulized salbutamol through the high flow nasal system moistened AIRVO â„¢ 2 in terms of reversibility of airflow obstruction compared to nebulization by the usual method (spray mask).
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Increased expiratory volume in one second ( FEV )
Timeframe: measured before and after nebulization of salbutamol at 0 minute and 15 minutes after nebulization of salbutamol