Abstract

In a retrospective analysis to determine whether secondary hyperparathyroidism in uremia has a role in uremic peripheral neuropathy, we simultaneously measured motor-nerve conduction velocity and serum parathormone level in 42 uremic patients. We compared age-matched groups of nondiabetic uremic patients, divided into three groups according to serum parathyroid hormone, for degree of impairment of motor-nerve conduction velocity, and 12 diabetic patients with uremia. The group with highest levels had a significantly (P less than 0.01) lower conduction velocity (25.3 +/- 4.9 m per second) than the group with normal or slightly elevated parathyroid hormone, who had only mild depression of nerve conduction (45.1 +/- 1.3 m per second). Mean serum calcium and creatinine were not significantly different between groups. Nerve conduction velocity was similarly depressed in 17 patients on additional dialysis studied prospectively and divided into groups according to parathyroid hormone levels. These results suggest a relation between high parathormone levels and uremic neuropathy and implicate parathyroid hormone as a uremic toxin.

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