Abstract
Purpose
It has been demonstrated that variation in thyroid hormone levels even within normal range was associated with increased cardiovascular risk. However, available data are still insufficient on association between left ventricular hypertrophy (LVH) and thyroid hormone levels within euthyroid state.
Methods
In 69,298 Koreans with euthyroid function, we evaluated association between echocardiographically detected LVH and thyroid hormone levels within the normal range. Study participants were categorized into elderly (age ≥ 40) and younger (age < 40) groups, where subjects were divided into four groups according to quartile levels of thyroxine (FT4), triiodothyronine (FT3), and thyroid-stimulating hormone (TSH). Multivariable adjusted logistic regression analysis was used to calculate odds ratios (ORs) and 95% confidence interval (CI) for LVH (adjusted ORs [95% CI]) across quartile levels of thyroid hormones.
Results
In elderly group, adjusted ORs for LVH generally higher in the first quartile group than other quartile groups, despite no statistical significance in some cases (first quartile: reference, second quartile: 0.86 [0.67–1.11] in TSH, 0.75 [0.58–0.95] in FT4 and 0.63 [0.49–0.81] in FT3, third quartile: 0.70 [0.54–0.92] in TSH, 0.79 [0.61–1.02] in FT4 and 0.72 [0.55–0.93] in FT3, fourth quartile: 0.81 [0.65–1.04] in TSH, 0.85 [0.65–1.10] in FT4 and 0.58 [0.44–0.77] in FT3). This finding was similarly found in the younger group, despite discrepancy in some cases.
Conclusion
In euthyroid state, low normal levels in FT4, FT3 and TSH were more strongly associated with LVH.
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Acknowledgement
This study was based on medical data collected and arranged by Kangbuk Samsung Cohort Study (KSCS). Therefore, this study could be done by virtue of the labor of all staffs working in KSCS and Total Healthcare Center, Kangbuk Samsung Hospital.
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SKP coordinated the study, analyzed the data and wrote the manuscript as a first author. JGK verified the data on echocardiographic parameters as a cardiologist. J-HR played role in analyzing data and editing English grammar. JYY is the guarantor of this work and, as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
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Ethics approvals for the study protocol and analysis of the data were obtained from institutional review board of Kangbuk Samsung Hospital.
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Informed consent was not required because we only assessed retrospective data without presonal identifying information.
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Park, S.K., Ryoo, JH., Kang, J.G. et al. Association of left ventricular hypertrophy with the level of thyroid hormone in euthyroid state. J Endocrinol Invest 44, 111–117 (2021). https://doi.org/10.1007/s40618-020-01277-7
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DOI: https://doi.org/10.1007/s40618-020-01277-7