title: Clopidogrel loading doses and outcomes of patients undergoing percutaneous coronary intervention for acute coronary syndromes.
abstract: BACKGROUND
  In clinical practice, the use of clopidogrel loading doses higher than the standard 300 mg dose is becoming more common in percutaneous coronary intervention (PCI) despite a paucity of clinical evidence to support such a strategy.
  
  
  OBJECTIVE
  This study sought to assess whether patients with acute coronary syndromes (ACS) undergoing PCI would receive additional benefit from higher-than-standard (300 mg) loading doses of clopidogrel.
  
  
  METHODS
  We performed a retrospective analysis of outcomes in 2,484 patients with ACS undergoing PCI who received either standard dose (300 mg, n = 1,199) or high-dose (> 300 mg, n = 1,285) clopidogrel loading at 1 of 14 study hospitals between January 2003 and September 2004.
  
  
  RESULTS
  At 60 days after discharge, the rate of the combined endpoint of myocardial infarction (MI), stroke, coronary revascularization or death was higher in the high-dose group (37.1< vs. 20.5%; p < 0.0001), primarily because of a higher rate of MI in the high-dose group (34.7% vs. 17.3%; p < 0.0001). Bleeding event rates did not differ between the high-dose and standard-dose groups. Propensity scoring was used to compare event frequencies between patients with similar clinical risk, and this analysis also showed no additional clinical benefit associated with higher clopidogrel loading doses.
  
  
  CONCLUSIONS
  Based on this retrospective study, the use of higher (> 300 mg) clopidogrel loading doses is not associated with additional clinical benefit in patients with ACS undergoing PCI in clinical practice.
authors: Solucient Inc. Thomson Healthcare, Montvale, New Jersey 07645, USA. brian.griffin@thomson.com
authors: Cheng
authors: C
authors: Wang
authors: Dean J
authors: DJ
authors: Kereiakes
authors: Jay P
authors: JP
authors: Bae
authors: Patrick
authors: P
authors: McCollam
authors: Jianming
authors: J
authors: He
authors: Brian
authors: B
authors: Griffin
mesh_terms: D054058:Acute Coronary Syndrome / Q000188:drug therapy*; D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D000077144:Clopidogrel; D003131:Combined Modality Therapy; D016208:Databases, Factual; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D008297:Male; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage* / Q000009:adverse effects; D012189:Retrospective Studies; D013988:Ticlopidine / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives*; D016896:Treatment Outcome
chemical_list: D010975:Platelet Aggregation Inhibitors; D000077144:Clopidogrel; D013988:Ticlopidine