title: Key messages from the National Prospective Tonsillectomy Audit.
abstract: OBJECTIVE
  Investigation of the occurrence of postoperative hemorrhage after tonsillectomy and risk factors for these complications.
  
  
  METHODS
  Prospective National Audit with electronic web-based data collection from the National Health Service and independent hospitals in England and Northern Ireland.
  
  
  METHODS
  Consenting patients undergoing tonsillectomy between July 2003 and September 2004 were included. A central database of patient and surgical variables was developed for analysis of primary and secondary postoperative hemorrhage and development of risk models for tonsillectomy complications.
  
  
  RESULTS
  The Audit received data from 277 hospitals in England and Northern Ireland on 40,514 patients. Analysis was conducted on 33,921 (84%) who gave consent. Over the whole Audit 1,197 (3.5%) postoperative hemorrhages were recorded. One hundred eighty-eight (0.6%) patients sustained a primary hemorrhage and 1,033 (3%) a secondary hemorrhage (24 had both). Elevated hemorrhage rates were observed in tonsillectomies performed using diathermy for dissection and hemostasis compared with cold steel dissection and ties for hemostasis. National guidance issued midway through the Audit influenced practice and reduced hemorrhage rates. Risk models for postoperative hemorrhage were developed incorporating the effect of the guidance. For hemorrhage, compared with the cold steel group, bipolar diathermy tonsillectomy had an odds ratio of 2.47 (1.81-3.36), P < .0001, and bipolar diathermy scissors tonsillectomy an odds ratio of 3.20 (2.09-4.90), P < .0001. Use of bipolar diathermy for hemostasis only after cold steel dissection carried an intermediate risk, odds ratio 1.57 (1.16-2.13), P = .004.
  
  
  CONCLUSIONS
  The results confirm that "hot" tonsillectomy techniques carry a substantially elevated risk of postoperative hemorrhage when diathermy is used as a dissection tool in tonsillectomy.
authors.affiliation: BAO-HNS Comparative Audit Group and Clinical Effectiveness Unit of The Royal College of Surgeons of England-London School of Hygiene and Tropical Medicine, London, United Kingdom. dlowe@rcseng.ac.uk
authors.forename: David
authors.initials: D
authors.lastname: Lowe
authors.forename: Jan
authors.initials: J
authors.lastname: van der Meulen
authors.forename: David
authors.initials: D
authors.lastname: Cromwell
authors.forename: James
authors.initials: J
authors.lastname: Lewsey
authors.forename: Lynn
authors.initials: L
authors.lastname: Copley
authors.forename: John
authors.initials: J
authors.lastname: Browne
authors.forename: Matthew
authors.initials: M
authors.lastname: Yung
authors.forename: Peter
authors.initials: P
authors.lastname: Brown
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D004564:Electrocoagulation / Q000706:statistics & numerical data; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008485:Medical Audit; D011182:Postoperative Care; D019106:Postoperative Hemorrhage / Q000453:epidemiology*; D017410:Practice Guidelines as Topic; D015995:Prevalence; D011446:Prospective Studies; D012307:Risk Factors; D014068:Tonsillectomy / Q000295:instrumentation* / Q000706:statistics & numerical data*