Risk appears the same for bare metal or drug-eluting devices, study found,,
SUNDAY, March 29 (HealthDay News) -- Despite initial concerns that stent thrombosis, a blood clot inside a stent, is more common with the drug-eluting device, there appears to be no difference in the clot risk for either drug-eluting or bare metal stents, a large new study found.
After a heart attack, many patients undergo a treatment called angioplasty, which opens the blocked coronary artery that caused the attack. With many of these procedures, the stent, a metallic mesh tube that props open the narrowed artery, is also inserted and left in place.
"We had a thrombosis rate of 3.3 percent over a year, which sounds high, but these are patients with acute [heart attacks] getting a stent," lead researcher Dr. George Dangas, an associate professor of medicine at Columbia University Medical Center in New York City, said during a Sunday morning teleconference at the American College of Cardiology's annual scientific sessions in Orlando, Fla. "So it's not that high after all."
"With any type of bare metal stent or drug-eluting stent, there was no difference after one year," Dangas added.
Bare metal stents -- as the name implies -- are bare tubes of metal mesh. Drug-eluting stents, in addition to keeping the artery open, slowly release a medication to prevent the build-up of scar tissue inside the stent.
A stent thrombosis can block blood flow through the stent and cause another heart attack or even death. Concerns have been raised that stent thrombosis might be more common in drug-eluting stents than bare-metal ones.
Dangas and his colleagues looked at data on 3,202 patients who participated in the HORIZONS-AMI trial; these patients received either bare metal stents or drug-eluting stents.
During the year after treatment, 107 patients (3 percent) developed stent thrombosis. The rate of stent throm
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