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Study Results Show That Minimally Invasive Therapy is Successful for Over Two-Thirds of Stroke Patients Treated Outside the Standard Eight-Hour Window
Date:7/30/2009

ion to pursue our hypothesis," said Nogueira. "Traditionally, these patients had been deemed untreatable. But if the therapeutic window could be expanded, these findings could make a significant impact on the future of stroke treatment."

The study included a consecutive case series of 237 patients whose first angiography (a diagnostic test that infuses the blood vessels with dye in order to clearly visualize the vessel structures) confirming a clot in the brain was performed later than eight hours from the last time the patient was seen well. All patients were identified from prospectively acquire databases at 10 high volume academic stroke centers across the United States.

Of the 237 study participants, 49 percent were males and 51 percent were females, with a mean (or average) age of 64 years and whose mean time from last seen well to t reatment was 15 hours. On the standard National Institute of Health Stroke Scale (NIHSS) -- a test that uses baseline data to determine severity of a stroke and projected outcome -- participants registered a mean score of 15 (any score over 10 is associated with a serious stroke). Various endovascular treatments were used, including: clot-dissolving drugs in 46 percent of the cases; the MERCI Retriever, a clot-removal device, in 62 percent of cases; and other mechanical instruments, including the recently FDA-approved Penumbra Device, in 36 percent of cases.

Beyond the immediate results that showed an overwhelming success in restoring blood flow, follow-up at 90 days in 198 patients indicate that 93 (47 percent) patients registered good outcomes (meaning patients could be functionally independent) and 123 (62 percent) patients reflected acceptable outcomes. Approximately nine percent suffered a symptomatic brain hemorrhage and the overall mortality rate was 22 percent. When analyzing what factors were most closely associated with favorable outcomes, succ
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SOURCE Society of NeuroInterventional Surgery
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