title: Association between pre-PTCA blood haemoglobin concentration and the risk of symptomatic restenosis after successful PTCA of primary coronary stenoses.
abstract: BACKGROUND
  Thrombus formation at the dilation site has been suggested to initiate the restenosis process after percutaneous transluminal coronary angioplasty (PTCA). High haemoglobin concentrations may predispose to thrombus formation by increasing blood viscosity, slowing coronary blood flow and increasing thrombocyte adhesion.
  
  
  METHODS
  Pre-PTCA blood haemoglobin concentrations (Hb) in 44 patients with symptomatic restenosis > or = 50% of the vessel diameter (Group A) were compared with Hb in the remaining 215 patients in a consecutive study population (Group B).
  
  
  RESULTS
  Median Hb (range) was 149 (119-164) g/l in Group A and 142 (117-164) g/l in Group B, P = 0.004. Odds ratio (95% CI) for symptomatic restenosis was 3.22 (1.62-6.42) when Hb was dichotomised according to the median in the entire material. Hb, but not sex was a significant risk factor in multivariate analysis.
  
  
  CONCLUSIONS
  Hb is a hitherto not recognized factor associated with the risk of symptomatic restenosis after PTCA and may be a link coupling male sex with increased risk of restenosis.
authors.affiliation: Department of Cardiology, University Hospital, Lund, Sweden.
authors.forename: C G
authors.initials: CG
authors.lastname: Gustavsson
authors.forename: S
authors.initials: S
authors.lastname: Persson
authors.forename: B O
authors.initials: BO
authors.lastname: Thorvinger
authors.forename: P
authors.initials: P
authors.lastname: Hedner
mesh_terms: D000328:Adult; D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D001809:Blood Viscosity; D016022:Case-Control Studies; D003327:Coronary Disease / Q000097:blood* / Q000453:epidemiology / Q000628:therapy*; D003328:Coronary Thrombosis / Q000097:blood* / Q000453:epidemiology; D005260:Female; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D012307:Risk Factors; D012737:Sex Factors
chemical_list: D006454:Hemoglobins