Data from the BRIGHT trial suggest bivalirudin may be more suitable than heparin alone or heparin plus tirofiban as anticoagulant therapy for patients with acute myocardial infarction (AMI) who are undergoing percutaneous coronary intervention (PCI).
At 30 days and 1 year after PCI, patients who received bivalirudin had a lower rate of net adverse clinical events (NACE)—death, reinfarction, bleeding, and
other events—than patients who received heparin.
Complete results from this study were published in JAMA alongside a related editorial.
Research has yet to reveal the optimal anticoagulant strategy for patients with AMI. Previous multicenter trials, such as HORIZONS-AMI and EUROMAX, have suggested that bivalirudin is superior to heparin plus glycoprotein IIb/IIIa inhibitors. But a recent single-center trial, HEAT-PPCI, indicated that heparin monotherapy was superior to bivalirudin alone.
So Gregg W. Stone, MD, of Columbia University Medical Center in New York, New York, and his colleagues conducted the BRIGHT trial to gain some insight into the issue.
The team analyzed 2194 patients with AMI who underwent emergency PCI at 82 Chinese sites. The patients were randomized to receive bivalirudin with a post-PCI infusion (n=735), heparin alone (n=729), or heparin plus tirofiban with a post-PCI infusion (n=730).
The primary endpoint was 30-day NACE, a composite of major adverse cardiac and cerebral events (MACCE) and bleeding. The secondary endpoints were NACE at 1 year, as well as MACCE and bleeding at 30 days and 1 year.
MACCE includes all-cause death, reinfarction, ischemia-driven target vessel revascularization, and stroke. Bleeding was defined by the Bleeding Academic Research Consortium (BARC) definition.
At 30 days, NACE had occurred in 8.8% of bivalirudin-treated patients, 13.2% of heparin-treated patients, and 17.0% of patients who received heparin plus tirofiban. The relative risk (RR) for bivalirudin vs heparin was 0.67 (P=0.008), and the RR for bivalirudin vs heparin plus tirofiban was 0.52 (P<0.001).
Patients who received bivalirudin had a lower rate of bleeding at 30 days than patients who received heparin or heparin plus tirofiban—4.1%, 7.5%, and 12.3% respectively (P<0.001).
There were no significant differences between treatments in the 30-day rates of MACCE (5.0%, 5.8%, and 4.9% respectively, P=0.74) and stent thrombosis (0.6%, 0.9%, and 0.7%, respectively, P=0.77). And there was no significant difference in acute (<24 hour) stent thrombosis (0.3% in each group).
At 1 year, patients in the bivalirudin arm still had a lower rate of NACE compared to patients in the heparin arm (12.8% vs 16.5%, RR=0.78, P=0.048) or patients who received heparin plus tirofiban (12.8% vs 20.5%, RR=0.62, P<0.001), due to lower rates of bleeding.
Rates of MACCE and stent thrombosis at 1 year were not significantly different between the treatment arms.
“By reducing bleeding with comparable rates of MACCE and stent thrombosis, bivalirudin significantly improved overall 30-day and 1-year outcomes, compared with both heparin alone and heparin plus tirofiban in patients with AMI undergoing primary PCI,” Dr Stone concluded.
The BRIGHT trial was funded, in part, by Salubris Pharmaceutical Co., makers of bivalirudin. Other funding came from the General Hospital of Shenyang Military Region and the Chinese Government National Key R&D project for the 12th five-year plan.
