Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Arrhythmia ?
    ### Response:
    An arrhythmia is a problem with the rate or rhythm of your heartbeat. It means that your heart beats too quickly, too slowly, or with an irregular pattern. When the heart beats faster than normal, it is called tachycardia. When the heart beats too slowly, it is called bradycardia.
    