The state of bronchial hyperreactivity in relation to adenotonsillectomy in asthmatic and non asthmatic children * * ** ** *** Yousef,A.A., Omar M.M ., Elwan,S.A.,Amer,E.A and El-Hamshary ,A.M Chest* ,Pediatrics** and Oto-Rhino-Laryngology *** Departments ,Banha Faculty of Medicine Abstract This study was conducted on 90 children with chronic tonsillitis and adenoid hypertrophy scheduled to undergo adenotonsilectomy.They were divided into 3 groups Group 1 (30cases) :those without any chest diseases .Group 2 (30cases):those with only increase in their bronchial hyperreactivity (BHR).Group 3 (30 cases):included children with bronchial asthma.All cases were subjected toventilatory function tests,bronchial provocation test using methacoline,estimation of the total blood eosinophilic count and total serum immunoglobuline E.These tests were done befor and 3 months after adenotonsillectomy .There was a significant increase in ventilatory function parameters in group 2 and 3 after surgery . The PD20FEV1 significantly increased and the blood eosinophilic count and total serum IgE significantly decreased in group 2 and 3 after adenotonsillectomy . Conclusion : Adenotonsillectomy for chronic tonsillitis and adenoid hypertrophy usually improves the ventilatory functions and BHR in asthmatic and non asthmatic children .