title: Bivalirudin compared with heparin during coronary angioplasty for thrombus-containing lesions.
abstract: OBJECTIVE
  We investigated whether bivalirudin is more effective than heparin in preventing ischemic complications in high risk patients undergoing coronary angioplasty for thrombus-containing lesions detected by angiography.
  
  
  BACKGROUND
  Heparin is administered during coronary angioplasty to prevent closure of the dilated vessel. Bivalirudin (Hirulog) is a direct thrombin inhibitor that can be safely substituted for heparin during angioplasty. Bivalirudin has several theoretic advantages over heparin as an anticoagulant agent.
  
  
  METHODS
  We performed an observational analysis of the Hirulog Angioplasty Study in which 4,098 patients with unstable or postinfarction angina were randomized to receive either bivalirudin or heparin during coronary angioplasty. The study group for this analysis consisted of 567 patients who had thrombus-containing lesions on angiography. The primary end point was death, myocardial infarction, emergency coronary artery bypass graft surgery or abrupt vessel closure before hospital discharge.
  
  
  RESULTS
  Patients with thrombus-containing lesions had a higher incidence of myocardial infarction (5.1% vs. 3.2%, p = 0.03) and abrupt vessel closure (13.6% vs. 8.3%, p < 0.001) than those without thrombus. In patients with thrombus-containing lesions, however, the incidence of the primary end point was not different between the bivalirudin and heparin treatment groups. Furthermore, no difference in the incidence of ischemic events at 6 months was seen between the treatment groups.
  
  
  CONCLUSIONS
  Bivalirudin is not more effective than heparin in preventing ischemic complications in patients undergoing coronary angioplasty for thrombus-containing lesions detected by angiography. Other approaches, perhaps involving potent anti-platelet agents, should be considered for patients with thrombus-containing lesions.
authors.affiliation: Department of Internal Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.
authors.forename: P B
authors.initials: PB
authors.lastname: Shah
authors.forename: W H
authors.initials: WH
authors.lastname: Ahmed
authors.forename: P
authors.initials: P
authors.lastname: Ganz
authors.forename: J A
authors.initials: JA
authors.lastname: Bittl
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D000925:Anticoagulants / Q000627:therapeutic use*; D000991:Antithrombins / Q000627:therapeutic use*; D003328:Coronary Thrombosis / Q000628:therapy*; D004311:Double-Blind Method; D005260:Female; D006493:Heparin / Q000627:therapeutic use*; D024764:Hirudin Therapy; D006629:Hirudins / Q000031:analogs & derivatives*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015337:Multicenter Studies as Topic; D017202:Myocardial Ischemia / Q000209:etiology / Q000517:prevention & control; D010446:Peptide Fragments / Q000627:therapeutic use*; D016032:Randomized Controlled Trials as Topic; D011994:Recombinant Proteins / Q000627:therapeutic use; D016896:Treatment Outcome
chemical_list: D000925:Anticoagulants; D000991:Antithrombins; D006629:Hirudins; D010446:Peptide Fragments; D011994:Recombinant Proteins; D006493:Heparin; C074619:bivalirudin