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Neuropsychologic deficits associated with primary hyperparathyroidism.

P J Numann, A J Torppa, A E Blumetti

    Surgery
    |December 1, 1984
    PubMed
    Summary

    Primary hyperparathyroidism impairs memory and cognition. Parathyroidectomy significantly improved these functions, suggesting surgery may benefit even asymptomatic patients with subtle deficits.

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    Area of Science:

    • Endocrinology
    • Neuropsychology
    • Neurosurgery

    Background:

    • Neuropsychological dysfunction is a recognized symptom of primary hyperparathyroidism.
    • The specific nature of memory, learning, and cognitive deficits remains poorly defined.

    Purpose of the Study:

    • To assess the nature and extent of neuropsychological deficits in patients with primary hyperparathyroidism.
    • To evaluate the impact of parathyroidectomy on these deficits.

    Main Methods:

    • A battery of psychologic tests was administered to 10 patients with hyperparathyroidism and 10 normocalcemic controls before and after surgery.
    • Tests included Wechsler Logical Memory, Associate Learning, Digit Span, and Similarities subtest.

    Main Results:

    • Patients with hyperparathyroidism showed statistically significant improvement in short-term verbal memory and cognition post-surgery.
    • The Wechsler Memory Quotient improved by an average of 17% in hyperparathyroid patients.
    • No changes were observed in tests of conceptual tracking, short-term visual memory, graphic skills, or fine motor coordination.

    Conclusions:

    • Hyperparathyroidism appears to disrupt dominant hemispheric functions, particularly verbal memory and cognition.
    • Parathyroidectomy leads to improved neuropsychological function.
    • The improvement suggests parathyroidectomy may be indicated even in asymptomatic patients due to subtle, difficult-to-assess deficits.

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