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Departments of Pathology (Neuropathology) and Neurology, Cleveland Metropolitan General Hospital and Case Western Reserve University School of Medicine, Cleveland, OH.
The rapid correction or over-correction of hyponatremia is believed by many to be the crucial factor in the causation of central pontine myelinolysis (CPM). Over a 17-year period we found CPM in 10 (7%) of the 139 burn patients examined postmortem but in only 10 (0.28%) of the 3,528 patients in the general autopsy population (p < 0.001). Each of the burn patients with CPM had suffered a prolonged, nonterminal episode of extreme serum hyperosmolality, whereas most burn patients without CPM had not suffered such an episode. The histologic age of the lesions correlated with the duration of time between the hyperosmolar episode and death. Hypernatremia, hyperglycemia, and azotemia, alone or combined, accounted for the hyperosmolality. No single electrolyte or metabolic derangement was essential, as in at least one burn patient with CPM the serum sodium, glucose, or blood urea nitrogen was normal during the hyperosmolar episode. Hyponatremia was not present in any burn patient with CPM. We conclude that severely burned patients, like alcoholics, are especially susceptible to CPM, and that in burn patients with CPM there is a striking association with serum hyperosmolality. The data also suggest that the rapid correction of hyponatremia exerts its effects by causing an osmotic shift and not because of any specific property of the sodium ion.
Address correspondence and reprint requests to Dr. McKee, Department of Neuropathology, Massachusetts General Hospital, Boston, MA 02114.
Received July 17, 1987. Accepted for publication in final form December 22, 1987.
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