title: Effect of clopidogrel on midterm graft patency following off-pump coronary revascularization surgery.
abstract: OBJECTIVE
  The aim of the study was to evaluate the effect of clopidogrel on midterm graft patency following off-pump coronary revascularization surgery.
  
  
  METHODS
  Ninety-four consecutive patients who underwent off-pump coronary artery bypass grafting between 1997 and 2002 were studied (58 men, 36 women; 61.7 +/- 9.8 years). The initial 36 patients (control group) received 75 to 160 mg acetyl salicylic acid (ASA) as an antiplatelet agent, whereas the consecutive 58 patients (clopidogrel group) received 75 mg clopidogrel postoperatively in addition to ASA. Intraoperatively, graft flow was assessed with transit-time flowmetry in all patients and the peripheral anastomoses were assessed with epicardial ultrasound in 28 patients. Sixty-two patients underwent angiography after a mean of 185 +/- 92 days. A total of 82 grafts were evaluated angiographically. Grafts with TIMI flow 2 and 3 were assessed as patent.
  
  
  RESULTS
  At angiographic follow-up, the overall graft patency rate was 84% (31/37) in the control group and 93% (42/45) in the clopidogrel group (P value was not significant [ns]). Graft patency rates for left internal mammary artery (LIMA) grafts were 92% (23/25) versus 96% (28/29) (ns), and for saphenous vein grafts were 66% (7/11) versus 87% (14/16) (ns), respectively.
  
  
  CONCLUSIONS
  The observed trend toward higher patency rates in patients treated with clopidogrel did not reach statistical significance. Further larger studies are necessary to confirm these preliminary results.
authors.affiliation: Institute of Circulation and Imaging Techniques, Norwegian University of Science and Technology, Trondheim, Norway.
authors.forename: Khalid
authors.initials: K
authors.lastname: Ibrahim
authors.forename: Ole
authors.initials: O
authors.lastname: Tjomsland
authors.forename: Dag
authors.initials: D
authors.lastname: Halvorsen
authors.forename: Rune
authors.initials: R
authors.lastname: Wiseth
authors.forename: Alexander
authors.initials: A
authors.lastname: Wahba
authors.forename: Asbjørn
authors.initials: A
authors.lastname: Karevold
authors.forename: Rune
authors.initials: R
authors.lastname: Haaverstad
mesh_terms: D000077144:Clopidogrel; D015331:Cohort Studies; D047549:Coronary Artery Bypass, Off-Pump / Q000009:adverse effects*; D005260:Female; D006083:Graft Occlusion, Vascular / Q000209:etiology* / Q000517:prevention & control*; D006085:Graft Survival / Q000187:drug effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage; D012189:Retrospective Studies; D013988:Ticlopidine / Q000008:administration & dosage / Q000031:analogs & derivatives*; D016896:Treatment Outcome; D014654:Vascular Patency / Q000187:drug effects*
chemical_list: D010975:Platelet Aggregation Inhibitors; D000077144:Clopidogrel; D013988:Ticlopidine