Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) familial restrictive cardiomyopathy ?
    ### Response:
    Familial restrictive cardiomyopathy is a genetic form of heart disease. For the heart to beat normally, the heart (cardiac) muscle must contract and relax in a coordinated way. Oxygen-rich blood from the lungs travels first through the upper chambers of the heart (the atria), and then to the lower chambers of the heart (the ventricles).
    