Hi Michele,
Remember that the heart toxicity from Herceptin could be reversible. So, if your muga score indicated pulling you off the study, they would put you back on, when your heart was acting better.
My clinic says anything above 50 would be acceptable. I've never failed echos so far. I have the last echo coming up later this summer, before the expiration of my Herceptin in Aug.
Good luck! Hugs
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