Journal of the Medical Association of Thailand Vol 95, No 5:MAY 2012 (SUPPL. 5) 0125-2208 95 5 2012 May Prevalence of Tonsillectomy and Adenoidectomy Complication at Phramongkutklao Hospital 69 EN Tarit Muninnobpamasa Kanyarat Khamproh Greetha Moungthong Original Article To determine the prevalence of complications and related risk factors in patients who underwent adenotonsillectomy in Phramongkutklao Hospital. The patients who had undergone adenotonsillectomy from January 2003 to December 2006 in the department of Otolaryngology, Phramongkutklao Hospital was retrospectively and prospectively reviewed. Information extracted included age, tonsillar size, indication for surgery, the post operative complications (anesthetic complication, primary bleeding, secondary bleeding, airway obstruction, dysphagia, wound pain, dehydration, length of stay in hospital and re-admission. Four hundred and eighty-one patients were enrolled, of which 36.8% were younger than 12 years-old and 63.2% were over 12 years-old; 39.3% male and 60.7% female. Indication for surgery provided by chronic hypertrophic tonsillitis 73%, obstructive sleep apnea 23.5%, peritonsillar abscess and others 3.5%. The prevalence of complications was anesthetic complication 1.6%, primary bleeding 4.1%, secondary bleeding 3.9%, dysphagia 29.0%, dehydration 4.6%, wound pain 48.1%. The average length of hospital stay was 3.6 days and re-admission 3.7%. The prevalence of post operative complication after tonsillectomy and adenoidectomy was low but higher than other previous studies included the primary bleeding and secondary bleeding. Tonsillectomy Adenoidectomy Complication