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Circadian cardiac autonomic nerve dysfunction in primary hyperparathyroidism improves after parathyroidectomy
Inga-Lena Nilsson1, Jan Aberg, Jonas Rastad
1Department of Surgery, Sundsvall Hospital, S-851 86 Sundsvall, Sweden.
Surgery
|December 12, 2003
Summary
Primary hyperparathyroidism impairs autonomic nervous system function, increasing cardiovascular risk. Parathyroidectomy can improve this dysfunction, suggesting a reversible link between hyperparathyroidism and cardiovascular disease.
Area of Science:
- Endocrinology
- Cardiovascular Medicine
- Autonomic Neuroscience
Background:
- Primary hyperparathyroidism is linked to premature cardiovascular death, but the underlying mechanisms and reversibility are unclear.
- Autonomic nervous system dysfunction is implicated in cardiovascular morbidity and may play a role in hyperparathyroidism.
Purpose of the Study:
- To investigate autonomic nervous function in patients with primary hyperparathyroidism.
- To assess the impact of parathyroidectomy on autonomic function and blood pressure.
Main Methods:
- 24-hour ambulatory blood pressure (ABP) monitoring and electrocardiographic recordings were performed in 21 hyperparathyroidism patients and 23 controls.
- Heart rate variability (HRV) was analyzed using time and frequency domain measures.
- Patients were reassessed one year after parathyroidectomy at normocalcemia.
Main Results:
- Patients with hyperparathyroidism exhibited blunted nocturnal increases in low-frequency HRV compared to controls.
- Nighttime very low-frequency HRV correlated inversely with serum parathormone levels and improved post-surgery.
- Both daytime and nighttime ABP were elevated in patients, with systolic ABP correlating with parathormone levels; ABP remained elevated post-surgery.
Conclusions:
- Primary hyperparathyroidism is associated with altered circadian autonomic function, which may improve after parathyroidectomy.
- Despite elevated blood pressure, the diurnal rhythm of ABP is preserved, suggesting distinct pathophysiologic mechanisms contributing to cardiovascular risk in hyperparathyroidism.