1. Kenneth Peirce, MD

    I have seen time and time again in clinic patients on antipsychotic medications, and in the hospital patients in sepsis and shock or alcoholics with myopathy or myelopathy, that the prolonged QTC interval immediately reverses with IV magnesium.
    We know that the serum level of magnesium is frequently at the low end of normal in such situations, and intracellular Mg levels are not readily available. It has been frequently documented in the general older populations for IC Mg to be low while serum Mg is normal.

    I suggest that every patient with a long QTC in outpatient and inpatient settings, be given Mg by appropriate route and measure the QTC after enough Mg has been given. You will be surprised how often and quickly corrects. Then prescribe Mg as a chronic necessary “supplement.”


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