The prognosis of an enlarged heart usually depends on the primary condition and the extent of the enlarged heart, which is related to the extent of the lesion (e.g. area of stenosis) and the presence of complications such as heart failure and arrhythmias. Patients with few complications, early detection of cardiac enlargement and effective control of risk factors generally have a better prognosis with aggressive treatment. Patients with dilated cardiomyopathy or those with severe heart failure or arrhythmias, especially in the elderly, infants and children with low resistance, generally have a poorer prognosis.