title: Blood transfusion for caesarean delivery complicated by placenta praevia.
abstract: OBJECTIVE
  This study was undertaken to determine if the need for red cell blood transfusion in placenta praevia could be predicted.
  
  
  METHODS
  Data from a retrospective observational study of 246 obstetric patients, with placenta praevia, from 1999 to 2005 were analysed to generate a model to predict requirement for transfusion.
  
  
  RESULTS
  Seventy-one patients were transfused. Independent risk factors for transfusion were gestational age at delivery of 32-35 weeks [odds ratio (OR): 2.6; 95% confidence interval (CI): 1.1-6.4] and caesarean combined with hysterectomy (OR: 29.4; 95% CI: 5.9-145.9; P < 0.001). No independent risk of transfusion was associated with maternal age, race, parity, smoking status, type of anaesthesia, caesarean combined with arterial balloon occlusion, grade of placenta, accreta and previous uterine surgery.
  
  
  CONCLUSIONS
  Gestational age at delivery and type of surgery required are predictors of transfusion during caesarean for placenta praevia. Arterial balloon occlusion does not appear to increase transfusion risk and may be considered as one of the techniques in management.
authors.affiliation: Department of Obstetric Anaesthesia, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia. rhonda_boyle@health.qld.gov.au
authors.forename: R K
authors.initials: RK
authors.lastname: Boyle
authors.forename: B A
authors.initials: BA
authors.lastname: Waters
authors.forename: P K
authors.initials: PK
authors.lastname: O'Rourke
mesh_terms: D000328:Adult; D002585:Cesarean Section / Q000009:adverse effects; D015331:Cohort Studies; D017707:Erythrocyte Transfusion; D005260:Female; D005865:Gestational Age; D006489:Hemostatic Techniques; D006801:Humans; D007044:Hysterectomy; D020380:Needs Assessment; D010923:Placenta Previa / Q000175:diagnosis / Q000209:etiology / Q000601:surgery*; D006473:Postpartum Hemorrhage / Q000175:diagnosis / Q000453:epidemiology* / Q000628:therapy*; D011247:Pregnancy; D012189:Retrospective Studies; D012307:Risk Factors