Arrhythmogenic right ventricular dysplasia (ARVD), also called arrhythmogenic right ventricular cardiomyopathy (ARVC), is a rare form of cardiomyopathy, where the heart muscle of the right ventricle (RV) is replaced by fat and/or fibrous tissue.

In ARVD, the bottom right chamber of the heart (called the right ventricle) may become enlarged and develop problems contracting. As a result, the heart is not able to pump blood as well. Patients with ARVD often have abnormal heart rhythms (arrhythmias), which can increase the risk of sudden cardiac arrest or death.