[Heart insufficiency as first manifestation of familial primary hypothyroidism].

Heart failure is not a common manifestation of hypothyroidism if there is no underlying heart disease. We report a case of familial primary hypothyroidism in a young male, that clinically onset with dyspnea, hemoptysis and serum CPK elevation, and in which further explorations revealed a dilated cardiomyopathy due to hypothyroidism. Because of its bad prognosis, we underline the need to identify those cases of dilated cardiomyopathy that can be treated with the appropriate therapy.