Hyperthyroidism is characterized by both increased sympathetic and decreased vagal modulation of heart rate: Evidence from spectral analysis of heart rate variability

Jin Long Chen, Hung Wen Chiu, Yin Jiun Tseng, Woei Chyn Chu

研究成果: 雜誌貢獻文章同行評審

66 引文 斯高帕斯(Scopus)

摘要

Objective: The clinical manifestations of hyperthyroidism resemble those of the hyperadrenergic state. This study was designed to evaluate the impact of hyperthyroidism on the autonomic nervous system (ANS) and to investigate the relationship between serum thyroid hormone concentrations and parameters of spectral heart rate variability (HRV) analysis in hyperthyroidism. Design and patients: Thirty-two hyperthyroid Graves' disease patients (mean age 31 years) and 32 sex-, age-, and body mass index (BMI)-matched normal control subjects were recruited to receive one-channel electrocardiogram (ECG) recording. Measurements: The cardiac autonomic nervous function was evaluated by the spectral analysis of HRV, which indicates the autonomic modulation of the sinus node. The correlation coefficients between serum thyroid hormone concentrations and parameters of the spectral HRV analysis were also computed. Results: The hyperthyroid patients revealed significant differences (P <0.001) compared with the controls in the following HRV parameters: a decrease in total power (TP), very low frequency power (VLF), low frequency power (LF), high frequency power (HF), and HF in normalized units (HF%); and an increase in LF in normalized units (LF%) and in the ratio of LF to HF (LF/HF). After correction of hyperthyroidism in 28 patients, all of the above parameters were restored to levels comparable to those of the controls. In addition, serum thyroid hormone concentrations showed significant correlations with spectral HRV parameters. Conclusions: Hyperthyroidism is in a sympathovagal imbalanced state, characterized by both increased sympathetic and decreased vagal modulation of the heart rate. These autonomic dysfunctions can be detected simultaneously by spectral analysis of HRV, and the spectral HRV parameters could reflect the disease severity in hyperthyroid patients.
原文英語
頁(從 - 到)611-616
頁數6
期刊Clinical Endocrinology
64
發行號6
DOIs
出版狀態已發佈 - 6月 2006

ASJC Scopus subject areas

  • 內分泌
  • 內分泌學、糖尿病和代謝

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