The word myasthenia means weakness of muscle. I think it is just another application of the term to another body muscle-- the heart. Someone correct me if I am mistaken.
Sometimes there are duplications in medical terminology.
Charcot foot, is not related to Charcot-Marie Tooth disorder, for example.
There are many causes of cardiomyopathy.
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Weezie looking at petunias 8.25.2017
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