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Muscle structure and function before and after surgery for primary hyperparathyroidism.

S Jansson1, G Grimby, I Hagne

  • 1Department of Surgery, Sahlgren's Hospital, University of Gothenburg, Sweden.

The European Journal of Surgery = Acta Chirurgica
|January 1, 1991
PubMed
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Primary hyperparathyroidism (pHPT) did not significantly impact muscle strength or morphology in most patients. Post-surgery, glycolytic enzyme activity increased, suggesting early effects on specific muscle fiber types.

Area of Science:

  • Endocrinology
  • Neurology
  • Muscle Physiology

Background:

  • Primary hyperparathyroidism (pHPT) is a common endocrine disorder often associated with hypercalcemia.
  • The effects of mild to moderate pHPT on skeletal muscle function and structure remain incompletely understood.
  • Previous research suggests potential involvement of type II muscle fibers in pHPT.

Purpose of the Study:

  • To investigate the impact of primary hyperparathyroidism (pHPT) on muscle strength, morphology, and enzymatic activity.
  • To evaluate changes in muscle function and biochemistry following surgical correction of pHPT.
  • To explore potential correlations between pHPT, muscle characteristics, and electromyography (EMG) findings.

Main Methods:

  • Studied 23 patients with primary hyperparathyroidism (pHPT) before and 6 months after surgery.

Related Experiment Videos

  • Assessed muscle strength, morphology, and enzymatic activities.
  • Performed electromyography (EMG) on patients.
  • Utilized healthy individuals and thyroid surgery patients as controls for muscle strength and morphology/enzymes, respectively.

    • Main Results:

    • Most pHPT patients had mild or moderate hypercalcemia; only three reported preoperative muscle weakness.
    • No significant differences in muscle strength or morphology were found between pHPT patients and controls.
    • Post-surgery, both pHPT patients and controls showed improved isokinetic muscle strength at higher velocities.
    • pHPT patients exhibited increased glycolytic but not oxidative muscle enzymes post-surgery, indicating potential effects on type II fibers.

    Conclusions:

    • Mild to moderate primary hyperparathyroidism (pHPT) does not appear to cause significant measurable deficits in muscle strength or morphology.
    • Post-surgical correction of pHPT may lead to improved muscle enzyme profiles, particularly glycolytic enzymes.
    • Findings suggest an early, subtle effect of pHPT on specific muscle fiber types (type II) rather than widespread muscle dysfunction.