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And scientists at Beth Israel Deaconess Medical Center have begun enrolment for a clinical trial to evaluate an even more powerful clot-busting medication called tissue plasminogen activator, or tPA.

In New York, Poor was going a step further with a drug called tissue plasminogen activator, or tPA, which doesn’t prevent clots — it breaks them up.

Physicians have effective methods of clearing these occlusions: clot-busting proteins called tissue plasminogen activators and thrombectomy, a surgical technique.

Until recently the only treatment available for ischemic stroke was tissue plasminogen activator, or tPA, a protein that can dissolve blood clots if injected up to four and a half hours after stroke onset.

One treatment is the clot buster tPA — a tissue plasminogen activator — which requires an IV and must be administered within 4½ hours of the stroke occurring.