Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) arrhythmogenic right ventricular cardiomyopathy ?
    ### Response:
    Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a form of heart disease that usually appears in adulthood. ARVC is a disorder of the myocardium, which is the muscular wall of the heart. This condition causes part of the myocardium to break down over time, increasing the risk of an abnormal heartbeat (arrhythmia) and sudden death.
    