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Adrenergic and cardiac dysfunction in primary hyperparathyroidism

Mats Birgander1, Steen Juul-Möller, Anne-Greth Bondeson

  • 1Department of Clinical Sciences, Cardiology, Lund University, Skåne University Hospital, Malmö, Sweden. mats.birgander@skane.se

Clinical Endocrinology
|July 12, 2011
PubMed

Insights

Primary hyperparathyroidism (PHPT) impairs catecholamine response to stress and affects heart rate variability (HRV). These findings suggest adrenergic dysfunction contributes to cardiovascular risks in PHPT patients.

Area of Science:

  • Endocrinology
  • Cardiovascular Medicine
  • Autonomic Nervous System Research

Background:

  • Primary hyperparathyroidism (PHPT) is linked to increased cardiovascular morbidity and mortality.
  • The exact mechanisms underlying these cardiovascular complications remain unclear.
  • Adrenergic dysfunction is hypothesized as a potential contributing factor.

Purpose of the Study:

  • To investigate adrenergic dysfunction in patients with mild PHPT.
  • To assess catecholamine response to physical stress and heart rate variability (HRV) in PHPT.
  • To evaluate the impact of parathyroidectomy (PTX) on these parameters.

Main Methods:

  • Compared 49 mild PHPT patients (serum calcium 2·7 ± 0·1 mM) with 48 age- and sex-matched controls.
  • Analyzed 24-h electrocardiograms for HRV.
  • Measured plasma epinephrine and norepinephrine at rest and after standardized physical tests.
  • Assessed patients pre-PTX and 6 months post-PTX.

Main Results:

  • PHPT patients exhibited reduced stress-induced epinephrine and norepinephrine levels compared to controls.
  • No significant changes in catecholamine response were noted 6 months post-PTX.
  • While baseline HRV and heart rate showed no differences, 6 months post-PTX, patients had significantly reduced HRV and decreased heart rate.
  • Higher preoperative parathyroid hormone levels correlated with greater postoperative changes in heart rate and HRV.

Conclusions:

  • PHPT is associated with impaired catecholamine response to physical stress, indicating adrenergic dysfunction.
  • Postoperative analysis revealed significant changes in heart rate and HRV after curative PTX.
  • Adrenergic dysfunction and HRV alterations should be considered in managing mild PHPT.
Abstract

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