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Ultrasound helps stroke treatment

nd is safe when used in this way," he said. Dr. Gregory del Zoppo, of Scripps Research Institute in La Jolla, Calif., and a member of the American Stroke Association's executive committee told UPI ultrasound "has been looked at by a number of investigators. There is no doubt that sound waves can (break-up) clots, but safety is a concern."

While Alexandrov's study, which was designed as a safety trial, found no safety problems using the diagnostic ultrasound devices, del Zoppo said he doubts such low power devices actually improve the recanalization rate of clot-busting drugs. The temptation, he said, will be to use more powerful devices "and that's where safety becomes an issue."

He noted researchers in Germany and in Oregon tried putting ultrasound clot-busting probes on catheters that were guided to the clot site but those studies were halted when the sound waves not only dissolved the clots but also damaged artery walls.

Moreover, del Zoppo said the recanalization rates cited by Alexandrov are not especially high. But Alexandrov said his early results are so promising a new phase II study aimed at determining the most effective frequency has already begun. So far 30 patients have been treated and the goal is to enroll 120 patients.


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