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Related Experiment Video

Updated: May 24, 2025

Screening of Axonal Degeneration in Carpal Tunnel Syndrome Using Ultrasonography and Nerve Conduction Studies
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The causal relationship between thyroid dysfunction and carpal tunnel syndrome: A Mendelian randomization study.

Fan Zhang1, Rongrong Cui1, Liang Yin1

  • 1Shandong Traditional Chinese Medicine University, Jinan, China.

Medicine
|February 28, 2025
PubMed
Summary

Thyroid dysfunction, including hypothyroidism and hyperthyroidism, causally increases carpal tunnel syndrome risk. This genetic study confirms a link between thyroid conditions and carpal tunnel syndrome.

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Area of Science:

  • Endocrinology and Neurology
  • Genetic Epidemiology

Background:

  • Carpal tunnel syndrome (CTS) is a common condition potentially linked to systemic diseases.
  • Thyroid dysfunction, encompassing hypothyroidism and hyperthyroidism, affects numerous bodily functions.

Purpose of the Study:

  • To investigate the potential causal relationship between thyroid dysfunction and carpal tunnel syndrome using a robust genetic approach.
  • To determine if genetic predispositions to hypothyroidism or hyperthyroidism increase CTS risk.

Main Methods:

  • Mendelian randomization (MR) analysis was employed, utilizing genetic variants associated with hypothyroidism and hyperthyroidism as instrumental variables.
  • Inverse variance weighting (IVW) was the primary analysis method, supported by weighted median and MR-Egger regression.
  • Sensitivity analyses, including heterogeneity and pleiotropy tests, were performed to ensure result validity.

Main Results:

  • Both hypothyroidism and hyperthyroidism showed a statistically significant causal association with an increased risk of carpal tunnel syndrome.
  • Hypothyroidism OR = 1.04 (95% CI = 1.01-1.08, P = .017); Hyperthyroidism OR = 1.08 (95% CI = 1.05-1.12, P = 9.218E-06).
  • No significant pleiotropy was detected, supporting the reliability of the MR findings.

Conclusions:

  • The study provides strong evidence for a causal link between thyroid dysfunction (both hypo- and hyperthyroidism) and an elevated risk of carpal tunnel syndrome.
  • These findings highlight the importance of considering thyroid health in the management and prevention of carpal tunnel syndrome.