title: Vasovagal reactions in high school students: findings relative to race, risk factor synergism, female sex, and non-high school participants.
abstract: BACKGROUND
  High school (HS) students have a high incidence of vasovagal reactions and are a good population for the study of vasovagal reactions.
  
  
  METHODS
  Data from 1,076 Caucasian students, 226 African-American students, and 157 nonstudents from HS blood drives in 2001 were entered into a database. Race, high-risk-factor synergism, the phenomenon of "survivorship," and female sex were evaluated. In addition, non-HS student participants were described.
  
  
  RESULTS
  Vasovagal reactions were 84 percent lower in African-American HS students than in Caucasian HS students (3 of 226 vs. 88 of 1,076; 1.3 vs. 8.2 percent; p = 0.0001; relative risk, 6.2). In Caucasian HS students, first-time donor status increased the vasovagal reaction rate to 9.4 percent (vs. 3.6% in repeat donors, p < 0.004). Low weight (</= 130 lb) increased the reaction rate to 13.6 percent (vs. 3.3% in weight > 81.2 kg, p < 0.001). Together they increased the reaction rate to 16.0 percent (vs. 3.2%, p < 0.0001). Females had more reactions than males (11.3 vs. 4.8%, p < 0.001), but the reaction rates equalized when donors under 150 lb were excluded (5.7 vs. 4.6%, p = 0.66).
  
  
  CONCLUSIONS
  African-American HS students had a significantly lower vasovagal reaction rate than Caucasian HS students. There was synergy among high-risk factors in Caucasian HS students. Female and male vasovagal reaction rates were similar when low-weight donors were excluded.
authors.affiliation: American Red Cross Blood Services, SE Michigan, Detroit, 48201, USA. newmanb@usa.redcross.org
authors.forename: B H
authors.initials: BH
authors.lastname: Newman
mesh_terms: D000293:Adolescent; D001782:Blood Donors; D001794:Blood Pressure; D001803:Blood Transfusion; D001835:Body Weight; D005260:Female; D006801:Humans; D008297:Male; D044469:Racial Groups; D012307:Risk Factors; D012737:Sex Factors; D013334:Students; D019462:Syncope, Vasovagal / Q000453:epidemiology / Q000209:etiology*