For many affected individuals, dilated cardiomyopathy
is a condition which will not limit the quality of life. A minority, however, experience significant symptoms and there is sometimes a risk of sudden death. Evaluation by a cardiologist is recommended to confirm the diagnosis and to assess the outlook and particularly the risk of complications. In some patients, symptoms of left- and right-sided congestive heart failure
develop gradually. Left ventricular dilatation may be present for months or even years before the patient becomes symptomatic.
Vague chest pain may be present, but typical angina pectoris
is unusual and suggests the presence of ischemic heart disease
as well. Syncope due to arrhythmias and systemic embolism may occur.