Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Isaacs' Syndrome ?
    ### Response:
    Issacs' syndrome (also known as neuromyotonia, Isaacs-Mertens syndrome, continuous muscle fiber activity syndrome, and quantal squander syndrome) is a rare neuromuscular disorder caused by hyperexcitability and continuous firing of the peripheral nerve axons that activate muscle fibers.
    