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 condition characterized by an abnormal heart rhythm (arrhythmia). As the heart rate increases in response to physical activity or emotional stress, it can trigger an abnormally fast and irregular heartbeat called ventricular tachycardia.
    