Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Catecholaminergic polymorphic ventricular tachycardia ?
    ### Response:
    Catecholaminergic polymorphic ventricular tachycardia (CPVT) is a genetic disorder that causes an abnormally fast and irregular heart rhythm in response to physical activity or emotional stress. Signs and symptoms include light-headedness, dizziness, and fainting.
    