Below is an instruction from Human. Write a response.
    ### Instruction:
    What is the outlook for Electrocardiogram ?
    ### Response:
    An electrocardiogram (EKG) is painless and harmless. A nurse or technician will attach soft, sticky patches called electrodes to the skin of your chest, arms, and legs. The patches are about the size of a quarter.
                
Often, 12 patches are attached to your body.
    