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  • Title: Thyrotoxic periodic paralysis, an unusual cause of hypokalemic periodic paralysis.
    Author: Berwaerts J, Verhelst J, Vandenbroucke M, Abs R, Martin JJ, Mahler C.
    Journal: Acta Neurol Belg; 1996 Dec; 96(4):301-6. PubMed ID: 9008779.
    Abstract:
    Over a two-year period two patients were admitted to the hospital with episodes of paralysis and hypokalemia. In the first patient, familial hypokalemic periodic paralysis was initially suspected. Only several months later was Graves' disease diagnosed and this diagnosis linked to thyrotoxic periodic paralysis. The second patient came to notice after treatment with thyreostatic drugs was stopped prematurely and paralysis together with hypokalemia developed. Thyrotoxic periodic paralysis, being rare outside Asia, closely mimics the clinical presentation of familial hypokalemic periodic paralysis. Mainly men in the third decade with a negative family history are affected. Graves' disease is the most common cause of hyperthyroidism. This disorder is not always clinically apparent since signs of hyperthyroidism may be easily missed. Therefore thyroid function tests are part of the diagnostic workup of hypokalemic periodic paralysis. Correction of thyroid function is essential to treatment. The pathophysiology is still controversial.
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