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In May 2011, Acusphere reached an agreement with the FDA, under a Special Protocol Assessment (SPA), on the design of a placebo controlled trial to demonstrate that stress ultrasound with Imagify has superior efficacy to stress ultrasound without Imagify.
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O novo contraste de microbolhas americano ainda tenta convencer o FDA das vantagens do uso.
Enquanto isso, desistiu de pedir a aprovação na Europa.
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