title: ABO-Rh blood groups distribution in cardiac syndrome X patients.
abstract: BACKGROUND
  Data on frequency distribution of ABO-Rh blood groups in cardiac syndrome X (CSX) patients are not available. We aimed to investigate the distribution of ABO-Rh blood groups in these patients.
  
  
  METHODS
  A total of 247 CSX patients' records were reviewed in a cross-sectional study from 2006 to 2010. One hundred forty six patients (59.1%) were female, and the mean patient age was 52 ± 11 years. The frequency of ABO-Rh blood groups was compared to the frequency of these blood groups in the West-Azerbaijan province, Iran; general population.
  
  
  RESULTS
  Blood groups distribution among CSX patients showed phenotypes A, B, AB, O and Rh negative as 33.1%, 21.9%, 9.3%, 35.8%, and 7.9%, respectively. According to our results, there were no differences in ABO-Rh blood groups distribution between CSX patients and normal population.
  
  
  CONCLUSIONS
  These data suggest that ABO-Rh blood groups might be unassociated with CSX.
authors.affiliation: Department of Biochemistry, Urmia University of Medical Sciences, Urmia, Iran.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Kheradmand
authors.forename: Yousef
authors.initials: Y
authors.lastname: Rasmi
authors.forename: Mohaddeseh
authors.initials: M
authors.lastname: Nemati
authors.forename: Mir Hossein Seyed
authors.initials: MH
authors.lastname: Mohammadzad