SUMÁRIOA paralisia periódica hipocalêmica tireotóxica (PPHT) é uma urgência endocrinológica carac terizada por ataques recorrentes de fraqueza muscular, associados à hipocalemia e à tireotoxi cose. Essa patologia ocorre mais frequentemente em pacientes do sexo masculino, de origem asiática, sendo rara sua apresentação em pessoas de ascendência africana. O caso descrito mostra um paciente afrodescendente que apresentou tetraparesia associada à hipocalemia. Durante esse episódio foi realizado o diagnóstico de hipertireoidismo. A PPHT, embora rara, é potencialmente letal. Portanto, em casos de crises de paresias flácidas, essa hipótese diagnósti ca deve ser sempre considerada, principalmente se associada à hipocalemia. Nessa situação, se não houver diagnóstico prévio de hipertireoidismo, este também deve ser considerado. Arq Bras Endocrinol Metab. 2014;58(7):779-81 SUMMARYThyrotoxic hypokalemic periodic paralysis (THPP) is an endocrine emergency marked by recur rent attacks of muscle weakness associated with hypokalemia and thyrotoxicosis. Asiatic male patients are most often affected. On the other hand, African descents rarely present this disea se. The case described shows an afrodescendant patient with hypokalemia and tetraparesis, whose diagnosis of hyperthyroidism was considered during this crisis. The THPP, although rare, is potentially lethal. Therefore, in cases of flaccid paresis crisis this diagnosis should always be considered, especially if associated with hypokalemia. In this situation, if no previous diagnosis of hyperthyroidism, this should also be regarded. Arq Bras Endocrinol Metab. 2014;58(7):779-81
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