HYPONATREMIA is a widely recognized complication of several central nervous system (CNS) disorders. Recent reports of hyponatremia in subarachnoid hemorrhage1 and herpes simplex encephalitis2 have added to a long list which includes meningitis,3 head injuries,4 brain tumors,5 and a variety of other CNS illnesses.6-8 The recognition of this complication is clinically important since hyponatremia per se may cause delirium, tremor, and convulsions, and thus create a problem in diagnosis or additionally insult an already damaged nervous system. It is less widely recognized that hyponatremia complicates "acute para-infectious" polyneuropathy, an illness usually considered to be restricted to the peripheral nervous system.9 To our knowledge, only three such cases have been reported;10-12 and in all, the lowered serum sodium produced no symptoms. This paper reports four cases of severe hyponatremia associated with, and complicating the course of, pareinfectious polyneuropathy. The evidence suggests that
Posner JB, Ertel NH, Kossmann RJ, Scheinberg LC. Hyponatremia in Acute Polyneuropathy: Four Cases With the Syndrome of Inappropriate Secretion of Antidiuretic Hormone. Arch Neurol. 1967;17(5):530–541. doi:10.1001/archneur.1967.00470290084011
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