Public Release: 

2 carotid artery stenting studies show results comparable to AHA guidelines

EXACT and CAPTURE 2 studies presented at TCT 2007; results comparable to AHA guidelines for patients treated with surgery

Columbia University Medical Center

Washington D.C., October 23, 2007 - Two carotid stenting trials examining patient outcomes demonstrated results that are comparable to guidelines established by the American Heart Association (AHA) for patients treated with carotid artery surgery. The results of these studies were presented today at the Cardiovascular Research Foundation's 19th annual Transcatheter Cardiovascular Therapeutics (TCT) scientific symposium by William A. Gray, M.D., FACC, associate professor of clinical medicine at Columbia University College of Physicians and Surgeons and director of Endovascular Services at the Center for Interventional Vascular Therapy at NewYork-Presbyterian Hospital/Columbia University Medical Center in New York. Dr. Gray is the director of Endovascular Services at the Cardiovascular Research Foundation.

An interim analysis of patients treated with carotid stents in Abbott's CAPTURE 2 (Carotid ACCULINK/ACCUNET Post Approval Trial to Uncover Rare Events) and EXACT (Emboshield and Xact Post Approval Carotid Stent Trial) post-marketing trials, which enrolled 4,111 patients in over 150 sites, demonstrated 30 day patient outcome results consistent with longstanding AHA guidelines for patients with a severe carotid stenosis but who do not have symptoms. These guidelines recommend that rates of complications for carotid artery surgery to prevent stroke be less than 3 percent for patients without symptoms of stroke (asymptomatic) and 6 percent for patients with symptoms of stroke (symptomatic).

"In these two well-conducted carotid artery stenting studies, carotid stenting has achieved outcomes comparable guidelines established for patients who undergo carotid surgery, and has done so in a population of patients who are at high risk for experiencing adverse events from surgery," said Dr. Gray. "This is a significant report because this is the first time that these guidelines have been achieved by any revascularization therapy in a large, multi-center examination of such patients, and although the guidelines were established for surgery (before stenting was practiced), there are no comparable surgical results in this group of patients."

In 1998, the American Heart Association published its 30 day outcome guidelines in Circulation for patients treated with carotid artery surgery. These guidelines were based on the observed stroke and death rates in patients with carotid artery disease who had undergone surgery, called carotid endarterectomy, to treat their condition. The guidelines were based on studies of surgery in patients who did not have excessive risks for anesthesia, etc., but left unanswered what the best therapy is for patients for whom surgery was risky. These two studies are the first demonstration of a therapy providing stroke prevention (carotid artery stenting) in these patients and they provide an option to those facing difficult decisions regarding the risks of surgery.

The CAPTURE 2 study included 1,987 patients and utilized Abbott's ACCULINK(tm) Carotid Stent System and ACCUNET(tm) Embolic Protection System. The EXACT study included 2,124 patients and utilized Abbott's Xact(r) Rapid Exchange Carotid Stent System and Emboshield BareWire(tm) Rapid Exchange Embolic Protection System. The key objective of both trials was to determine whether carotid stenting could be performed safely in the real-world clinical setting by physicians with varying levels of experience. The primary endpoints were death, stroke and MI at 30 days. The demographics of patients in both trials were similar.

The 30-day composite endpoints of stroke and death for patients in the CAPTURE 2 and EXACT studies were:

  • 3.1 percent and 3.0 percent combined stroke and death in CAPTURE 2 and EXACT patients without symptoms under age 80
  • 6.0 percent and 7.3 percent combined stroke and death in CAPTURE 2 and EXACT patients with symptoms under age 80
  • 3.8 percent and 4.0 percent stroke and death within 30-days of treatment for the combined patient populations

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Patient enrollment for the CAPTURE 2 trial is ongoing. The EXACT trial is closed and 30-day follow up has been completed. For information about clinical trials at Columbia University Medical Center, call 212-342-4747.

Dr. Gray's clinical research focuses on new, non-surgical modalities for stroke prevention, the non-surgical treatment of abdominal aortic aneurysm, and research into preventing the reoccurrence of disease following successful angioplasty or stenting.

Columbia University Medical Center provides international leadership in pre-clinical and clinical research, in medical and health sciences education, and in patient care. The medical center trains future leaders and includes the dedicated work of many physicians, scientists, nurses, dentists, and public health professionals at the College of Physicians and Surgeons, the Mailman School of Public Health, the College of Dental Medicine, the School of Nursing, the biomedical departments of the Graduate School of Arts and Sciences, and allied research centers and institutions. For more information, visit www.cumc.columbia.edu.

NewYork-Presbyterian Hospital--based in New York City--is the nation's largest not-for-profit, non-sectarian hospital, with 2,242 beds. It provides state-of-the-art inpatient, ambulatory and preventive care in all areas of medicine at five major centers: NewYork-Presbyterian Hospital/Weill Cornell Medical Center, NewYork-Presbyterian Hospital/Columbia University Medical Center, Morgan Stanley Children's Hospital of NewYork-Presbyterian, NewYork-Presbyterian Hospital/Allen Pavilion and NewYork-Presbyterian Hospital/Westchester Division. One of the largest and most comprehensive health-care institutions in the world, the Hospital is committed to excellence in patient care, research, education and community service. It ranks sixth in U.S. News & World Report's guide to "America's Best Hospitals," ranks first on New York magazine's "Best Hospitals" survey, has the greatest number of physicians listed in New York magazine's "Best Doctors" issue, and is included among Solucient's top 15 major teaching hospitals. The Hospital is ranked with among the lowest mortality rates for heart attack and heart failure in the country, according to a 2007 U.S. Department of Health and Human Services (HHS) report card. The Hospital has academic affiliations with two of the nation's leading medical colleges: Weill Cornell Medical College and Columbia University College of Physicians and Surgeons. For more information, visit www.nyp.org.

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