title: Relationship between postoperative clopidogrel use and subsequent angiographic and clinical outcomes following coronary artery bypass grafting.
abstract: Dual antiplatelet therapy with both aspirin and clopidogrel is increasingly used after coronary artery bypass grafting (CABG); however, little is known about the safety or efficacy. We sought to determine the relationship between postoperative clopidogrel and clinical and angiographic outcomes following CABG. We evaluated 3,014 patients from PREVENT IV who underwent CABG at 107 US sites. Postoperative antiplatelet therapy was left to physician discretion. Risk-adjusted angiographic and clinical outcomes were compared in patients taking and not taking clopidogrel 30 days post-CABG. At 30 days, 633 (21%) patients were taking clopidogrel. Clopidogrel users were more likely to have peripheral vascular (15 vs. 11%) and cerebrovascular disease (17 vs. 11%), prior myocardial infarction (MI) (46 vs. 41%), and off-pump surgery (33 vs. 18%). Clopidogrel use was associated with statistically insignificant higher graft failure (adjusted odds ratio 1.3; 95% confidence interval [CI] [1.0, 1.7]; P = 0.05). At 5-year follow-up, clopidogrel use was associated with similar composite rates of death, MI, or revascularization (27 vs. 24%; adjusted hazard ratio 1.1; 95% CI [0.9, 1.4]; P = 0.38) compared with those not using clopidogrel. There was an interaction between use of cardiopulmonary bypass and clopidogrel with a trend toward lower 5-year clinical events with clopidogrel in patients undergoing off-pump CABG. In this observational analysis, clopidogrel use was not associated with better 5-year outcomes following CABG. There may be better outcomes with clopidogrel among patients having off-pump surgery. Adequately powered randomized clinical trials are needed to determine the role of dual antiplatelet therapy after CABG.
authors.affiliation: Duke Clinical Research Institute, Durham, NC, USA.
authors.forename: Judson B
authors.initials: JB
authors.lastname: Williams
authors.forename: Renato D
authors.initials: RD
authors.lastname: Lopes
authors.forename: Gail E
authors.initials: GE
authors.lastname: Hafley
authors.forename: T Bruce
authors.initials: TB
authors.lastname: Ferguson
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Mack
authors.forename: C Michael
authors.initials: CM
authors.lastname: Gibson
authors.forename: Robert A
authors.initials: RA
authors.lastname: Harrington
authors.forename: Eric D
authors.initials: ED
authors.lastname: Peterson
authors.forename: Peter K
authors.initials: PK
authors.lastname: Smith
authors.forename: Rajendra H
authors.initials: RH
authors.lastname: Mehta
authors.forename: John H
authors.initials: JH
authors.lastname: Alexander
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001241:Aspirin / Q000008:administration & dosage / Q000009:adverse effects; D000077144:Clopidogrel; D017023:Coronary Angiography; D001026:Coronary Artery Bypass; D004311:Double-Blind Method; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000000981:diagnostic imaging* / Q000401:mortality / Q000628:therapy*; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage* / Q000009:adverse effects; D011182:Postoperative Care; D013988:Ticlopidine / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives*
chemical_list: D010975:Platelet Aggregation Inhibitors; D000077144:Clopidogrel; D013988:Ticlopidine; D001241:Aspirin
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