title: Prevalence of and risk factors for aspirin resistance in elderly patients with coronary artery disease.
abstract: OBJECTIVE
  To assess the prevalence of and related risk factors for aspirin resistance in elderly patients with coronary artery disease (CAD).
  
  
  METHODS
  Two hundred and forty-six elderly patients (75.9 ± 7.4 years) with CAD who received daily aspirin therapy (≥ 75 mg) over one month were recruited. The effect of aspirin was assessed using light transmission aggregometry (LTA) and thrombelastography platelet mapping assay (TEG). Aspirin resistance was defined as ≥ 20% arachidonic acid (AA)-induced aggregation and ≥ 70% adenosine diphosphate (ADP)-induced aggregation in the LTA assay. An aspirin semi-responder was defined as meeting one (but not both) of the criteria described above. Based on the results of TEG, aspirin resistance was defined as ≥ 50% aggregation induced by AA.
  
  
  RESULTS
  As determined by LTA, 23 (9.3%) of the elderly CAD patients were resistant to aspirin therapy; 91 (37.0%) were semi-responders. As determined by TEG, 61 patients (24.8%) were aspirin resistant. Of the 61 patients who were aspirin resistant by TEG, 19 were aspirin resistant according to LTA results. Twenty-four of 91 semi-responders by LTA were aspirin resistant by TEG. Multivariate logistic regression analysis revealed that elevated fasting serum glucose level (Odds ratio: 1.517; 95% CI: 1.176-1.957; P = 0.001) was a significant risk factor for aspirin resistance as determined by TEG.
  
  
  CONCLUSIONS
  A significant number of elderly patients with CAD are resistant to aspirin therapy. Fasting blood glucose level is closely associated with aspirin resistance in elderly CAD patients.
authors.affiliation: First Geriatric Cardiology Division of South Building, Chinese PLA General Hospital, 28 Fuxing Road, Beijing 100853, China.
authors.forename: Xian-Feng
authors.initials: XF
authors.lastname: Liu
authors.forename: Jian
authors.initials: J
authors.lastname: Cao
authors.forename: Li
authors.initials: L
authors.lastname: Fan
authors.forename: Lin
authors.initials: L
authors.lastname: Liu
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.forename: Guo-Liang
authors.initials: GL
authors.lastname: Hu
authors.forename: Yi-Xin
authors.initials: YX
authors.lastname: Hu
authors.forename: Xiao-Li
authors.initials: XL
authors.lastname: Li
keywords: Aspirin resistance; Coronary artery disease; Risk factors