<prompt> What will be reversible damage?Fev1 decrease by 50 by SABAFev1 increase by 12 by SABAFev1 decrease by 25 by SABAFev1 decrease by 5 by SABA  <response>: In this question primarily we talking about asthma We give salbutamol FEV1 becomes Normal Change of FEV1 before after giving salbutamol SABA should be at least 12 to call it Bronchial Asthma. 