Circulation, Vol 84, 1568-1580, Copyright © 1991 by American Heart Association
PW Serruys, W Rutsch, GR Heyndrickx, N Danchin, EG Mast, W Wijns, BJ Rensing, J Vos and J Stibbe
BACKGROUND. GR32191B is a novel thromboxane A2-receptor antagonist with
potent antiagregational and antivasoconstrictive properties. We have
conducted a randomized, double-blind placebo-controlled trial to study its
usefulness in restenosis prevention. METHODS AND RESULTS. Patients received
either GR32191B (80 mg orally before angioplasty and 80 mg/day orally for 6
months) or 250 mg i.v. aspirin before angioplasty and placebo for 6 months.
Coronary angiograms before angioplasty, after angioplasty, and at 6-month
follow-up were quantitatively analyzed. Angioplasty was attempted in 697
patients. For efficacy analysis, quantitative angiography at follow-up was
available in 522 compliant patients (261 in each group). Baseline clinical
and angiographic parameters did not differ between the two treatment
groups. The mean difference in coronary diameter between postangioplasty
and follow-up angiogram (primary end point) was -0.31 +/- 0.54 mm in the
control group and -0.31 +/- 0.55 mm in the GR32191B group. Clinical events
during 6-month follow-up, analyzed on intention-to-treat basis, were ranked
according to the highest category on a scale ranging from death (control,
six; GR32191B, four) to nonfatal infarction (control, 22; GR32191B, 18),
bypass grafting (control, 19; GR32191B, 22) and repeat angioplasty
(control, 52; GR32191B, 48). No significant difference in ranking was
detected. Six months after angioplasty, 75% of patients in the GR32191B
group and 72% of patients in the control group were symptom free.
CONCLUSIONS. Long-term thromboxane A2-receptor blockade with GR32191B does
not prevent restenosis and does not favorably influence the clinical course
after angioplasty.
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Prevention of restenosis after percutaneous transluminal coronary angioplasty with thromboxane A2-receptor blockade. A randomized, double- blind, placebo-controlled trial. Coronary Artery Restenosis Prevention on Repeated Thromboxane-Antagonism Study (CARPORT)
Thoraxcenter Erasmus University, Rotterdam, The Netherlands.
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