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Stroke news tips for Thursday, Feb. 5, 2004

y stenting. A new technology called multi-frequency transcranial Doppler (TCD) ultrasound has shown it can tell doctors whether microscopic particles created during carotid artery procedures are merely gas bubbles or dangerous tiny clots that can reach the brain, causing small but damaging strokes. Houston researchers tested the ability of TCD, which uses both high and low frequency sound waves, to differentiate between solid and gaseous emboli during carotid artery stenting and angiography. "Microembolization" frequently occurs during stenting even with deployment of a distal protection device, the researchers found. More solid emboli (clots) were seen during manipulations that crossed artery lesions. "In this pilot study, multi-frequency TCD for automated emboli detection registered a high number of events," the researchers reported. They said further evaluation is needed to determine the true nature, size and number of emboli seen.


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Contact: Carole Bullock
carole.bullock@heart.org
214-706-1279
American Heart Association
5-Feb-2004


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