Clot-busters, caught on tape

Clot-busters, caught on tape

Previous work on this technique, which is called sonothrombolysis, has focused on indirect indications of its effectiveness, including how much a blood clot shrinks or how well blood flow is restored following the procedure. The Toronto team, which included researchers from the University of Toronto and the Sunnybrook Research Institute, tried to catch the clot-killing process in action. Using high-speed photography and a 3-D microscopy technique, researchers discovered that stimulating the microbubbles with ultrasonic pulses pushes the bubbles toward the clots. The bubbles deform the clots' boundaries then begin to burrow into them, creating fluid-filled tunnels that break the clots up from the inside out.

These improvements in the understanding of how sonothrombolysis works will help researchers develop more sophisticated methods of breaking up blood clots, said lead author Christopher Acconcia.

Efforts so far "may only be scratching the surface with respect to effectiveness," said Acconcia. "Our findings provide a tool that can be used to develop more sophisticated sonothrombolysis techniques, which may lead to new tools to safely and efficiently dissolve clots in a clinical setting."

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