A fatal hyperthermic syndrome occurred in a patient with myokymia. The patient suffered acute circulatory collapse and severe rhabdomyolysis associated with hyperthermia. Although these symptoms, were similar to neuroleptic malignant syndrome or malignant hyperthermia, he did not have a history of antipsychotic medication or anesthesia. Continuous muscular contraction due to myokymia likely led to the development of hyperthermic syndrome.
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