How dangerous is dilated cardiomyopathy?

Depends. Depends on how severe it is. Milder forms can be controlled with medications, which is the majority of patients, and a normal lifestyle is quite possible. The most severe cases may be eligible for heart transplantation, talk to your doctor.
Depends. Dilated cardiomyopathy (dcm) prognosis depends on many things. The degree of dysfunction affects the prognosis. The degree of symptoms affects the prognosis; additionally the cause affects the prognosis as well. If the cause can be reversed by revascularization, if it is a viral etiology or a type from which recovery is possible (valve replacement, cessation of alcohol) the prognosis may by better.