DCM can be caused by a variety of disorders including autoimmune dieases, viral infections, inflammatory conditions like lupus, and medication side effects. Both hyperthyroidism and hypothyroidism could cause DCM, but I don't think either condition could be causing a misdiagnosis here. If it is not, then I don't understand how he would have been given a diagnosis of cardiomyopathy. For information regarding prognosis and treatment, I suggest that you speak with his cardiologist. I hope you find this information useful.
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