Effect of beta-blockers on ventilatory function in smokers and non smokers.

Twenty healthy nonsmokers, 20 asymptomatic mild smokers and 20 asymptomatic moderate smokers were assessed for ventilatory functions, before and after equipotent dosages of atenolol, propranolol and oxprenolol in a single blind longitudinal study. The basal spirometric values were significantly lower in smokers than non smokers. After propranolol significant reduction was seen from basal values in FEV1, FEF 75%, MMFR, FEF 200-1200 in all the three groups.