Analysis of the causes of immediate unanticipated bleeding after pediatric adenotonsillectomy

Objectives: To assess the incidence of unexpected postoperative bleeding in children undergoing adenoidectomy and/or tonsillectomy (T&A), and to investigate its possible undetected haematological causes. Methods: We prospectively collected all patients under 14 years of age with a normal preoperative haematologic work-up (activated partial thromboplastic time, prothrombin time, fibrinogen, and platelet count), who underwent surgery of adenoids and/or tonsils at our institution between January 1997 and November 2000. Results: There were 1516 cases that accomplished the inclusion criteria in the period of survey. Thirteen patients bled after surgery. This represents an incidence of 0.8% of immediate postoperative haemorrhage among the 1516 procedures analyzed. No statistical differences were found between bleeding and non-bleeding patients according to age, sex, and type of procedure (P>0.05). In 6 of the 13 bleeding patients (46.1%) an alteration of the coagulation system was subsequently found: 5 von Willebrand's disease, and 1 releasing thrombopathy. Conclusions: The incidence of bleeding after adeno and/or tonsillectomy at our institution is comparable with series previously reported in the current medical literature. In nearly one half of the cases, undetected coagulation diseases (mainly von Willebrand's disease) are diagnosed after surgery in the haematological study.