Public Release: 

Device innovation is driving improvement in stroke treatment outcomes

Society of NeuroInterventional Surgery

SAN FRANCISCO, CA - July 27, 2015 - In the last decade, Intra-Arterial (IA) stroke therapy (a technique in which thrombolytic agents and devices are passed through the arteries directly to the clot site) has gained notable momentum as an effective and safe treatment option for patients. Two new studies released today at the Society of NeuroInterventional Surgery 12th Annual Meeting in San Francisco, further reinforce the value and progress of IA treatment with conclusions that the innovative new devices that facilitate this approach are reducing treatment times, improving outcomes and decreasing mortality rates.

Since Stent Retrievers - the latest evolution of devices for IA treatment - became available in 2012, no comparative analysis with pre-retriever devices has been conducted to determine differences in utilization or clinical outcomes. In the Trends and Outcomes of Mechanical Thrombectomy in Patients with Acute Ischemic Stroke: A Review of National In-Patient Database, joint investigators, Drs. Srikanth Boddu and Ning Lin, at New York Presbyterian Hospital and Weill Cornell Medical Center in New York, New York, used the Nationwide Inpatient Sample (NIS) database provided by the Agency for Healthcare Research and Quality (AHRQ) to analyze outcomes across three generations of devices: 2006-2007 (Post-MERCI); 2008-2011 (Post-Penumbra); and 2012 (Stent Retrievers).

Results showed that while the number of stroke cases climbed across these three time periods, from 723,327 to 738,490, the rate of deaths decreased with newer devices. In 2012, Stent Retrievers were associated with a mortality rate of 17.1 percent vs. pre-retriever devices in both 2008-2011 (19.3 percent) and 2006-2007 (25 percent). Additionally, the age-specific mortality following stroke intervention decreased with newer devices for patients ? 80 and 65-79 years of age: 2012 (20 and 14.9 percent, respectively) compared to 2008-2011 (25.8 and 20.5 percent, respectively) and 2006-2007 (26.3 and 30.2 percent, respectively). These findings are significant as they prove that older patients can in fact benefit from IA therapy and that age, alone, is not an exclusion criteria for interventional treatment.

"It is clear that the introduction of Stent Retrievers for stroke treatment has been a significant game changer. Not only have these tools provided practitioners with new approaches to treatment," said Dr. Srikanth Boddu, lead investigator and interventional neuroradiologist at the Weill Cornell Brain and Spine Center in New York, New York, "but we have also proven that innovation is worth the investment. With treatment advances, we are seeing increasing numbers of patients survive stroke."

In a second study, Implementation of New Technological Advances of Endovascular Treatment in Acute Ischemic Stroke Provides Overall Improvement in Procedural Times conducted at the Swedish Medical Center in Englewood, Colorado, the usefulness and performance afforded by evolving devices were again the focus as investigators sought to understand if newer tools were associated with better outcomes and shorter procedural times. A data analysis was conducted across 6 prospective and retrospective endovascular treatment trials, with various evolutions of the Penumbra Aspiration System being used as the primary therapy. Out of a pool of 932 subjects, study results showed that the newer and larger Penumbra catheters provided a faster and more efficient method for treating acute ischemic stroke. In turn, when considering variables including age, baseline National Institutes of Health Stroke Scale (NIHSS) score (which assesses stroke severity), and post-treatment status of restoration of blood flow, shorter procedural times were a significant predictor of better clinical outcomes at 90 days, as measured by the modified Rankin Scale (mRS), a standard tool used to indicate level of independence following a stroke.

Dr. Donald Frei, lead author of the study, president of the Society of NeuroInterventional Surgery (SNIS) and neurointerventionalist at Swedish Medical Center, echoed the optimistic sentiment espoused by Dr. Boddu. "As each new generation of devices provides improved tools for our treatment arsenal, we are able to adjust our approach to maximize efficiencies and results for our patients. Time is the most important factor when treating a stroke, so it is incumbent upon all of us to use every tool at our disposal to achieve fast and effective treatment," Dr. Frei said. "Thankfully, each generation of new devices has proven to reduce procedure time, which raises the chance of a successful operation."

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About The Society of NeuroInterventional Surgery

The Society of NeuroInterventional Surgery (SNIS) is a scientific and educational association dedicated to advancing the specialty of neurointerventional surgery through research, standard-setting and education and advocacy in order to provide the highest quality of patient care in diagnosing and treating diseases of the brain, spine, head and neck. http://www.snisonline.org. Follow us on Twitter @SNISinfo.

About New York Presbyterian Hospital

NewYork-Presbyterian Hospital, based in New York City, is one of the nation's largest and most comprehensive hospitals and a leading provider of inpatient, ambulatory and preventive care in all areas of medicine. With some 2,600 beds and more than 6,700 affiliated physicians and almost 22,000 employees, NewYork-Presbyterian had more than 2 million visits in 2014, including some 14,000 infant deliveries and more than 262,000 emergency department visits. NewYork-Presbyterian comprises six campuses: NewYork-Presbyterian/Weill Cornell Medical Center, NewYork-Presbyterian/Columbia University Medical Center, NewYork-Presbyterian/Morgan Stanley Children's Hospital, NewYork-Presbyterian/The Allen Hospital, NewYork-Presbyterian/Westchester Division and NewYork-Presbyterian/Lower Manhattan Hospital. The hospital is also closely affiliated with NewYork-Presbyterian/Hudson Valley Hospital, NewYork-Presbyterian/Lawrence Hospital and NewYork-Presbyterian/Queens. NewYork-Presbyterian is the #1 hospital in the New York metropolitan area, according to U.S. News & World Report, and consistently named to the magazine's Honor Roll of best hospitals in the nation. Affiliated with two world-renowned medical schools, Weill Cornell Medical College and Columbia University College of Physicians and Surgeons, NewYork-Presbyterian is committed to excellence in patient care, research, education and community service. For more information, visit http://www.nyp.org.

About Swedish Medical Center

Swedish Medical Center serves as the Rocky Mountain Region's referral center for neurotrauma and as the region's first Joint Commission certified Comprehensive Stroke Center, a recognized leader in the most advanced stroke care. An acute care hospital with 368 licensed beds. Swedish is located in the south metro Denver area. Annually, Swedish cares for more than 200,000 patients with a team of 2,000 dedicated employees, 500 volunteers and more than 1,300 physicians.

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