title: Severe outcomes of allogeneic and autologous blood donation: frequency and characterization.
abstract: BACKGROUND
  There are few published data on severe outcomes of the donation of blood for allogeneic or autologous use. It would be helpful if blood collectors could better characterize and/or predict the likelihood of significant complications of blood donation.
  
  
  METHODS
  Very severe outcome (VSO) was defined as an event requiring hospitalization. Approximately 4.1 million American Red Cross whole-blood donation records (July 1993-March 1994) were reviewed for the incidence and type of VSO.
  
  
  RESULTS
  A total of 33 VSOs occurred for all donations. The incidence of VSOs for allogeneic donation was 1 (0.0005%) in 198,119 and that for autologous donation was 1 (0.006%) in 16,783 (p < 0.001). First-time donors were three times as likely to have a VSO. Donors > 40 years old had 87.9 percent of the VSOs, and donors > 60 years old had 48.5 percent. Vasovagal (66.7%) and anginal (12.1%) episodes were the most frequent complications, and 66.7 percent of reactions occurred at the blood collection site. The mean hospital stay was 1.9 days.
  
  
  CONCLUSIONS
  VSO is an infrequent complication of all types of blood donation, but its occurrence may be associated with significant morbidity and cost. VSO is nearly 12 times as likely in autologous blood donors.
authors.affiliation: American Red Cross Blood Services, Dedham, Massachusetts, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: Popovsky
authors.forename: B
authors.initials: B
authors.lastname: Whitaker
authors.forename: N L
authors.initials: NL
authors.lastname: Arnold
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001782:Blood Donors / Q000523:psychology; D001804:Blood Transfusion, Autologous; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012011:Red Cross; D012307:Risk Factors; D012449:Safety; D014184:Transplantation, Homologous; D014481:United States