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Related Experiment Videos

Thyroid dysfunction and serum lipids: a community-based study.

John P Walsh1, Alexandra P Bremner, Max K Bulsara

  • 1Department of Endocrinology and Diabetes, Sir Charles Gairdner Hospital, Perth, Western Australia, Australia. john.walsh@health.wa.gov.au

Clinical Endocrinology
|December 14, 2005
PubMed
Summary

Subclinical hypothyroidism (SCH) is linked to higher LDL cholesterol levels. This association remains significant even after adjusting for age and sex, indicating a potential cardiovascular risk factor.

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Area of Science:

  • Endocrinology
  • Cardiovascular Health
  • Clinical Biochemistry

Background:

  • Subclinical hypothyroidism (SCH) is a condition characterized by elevated thyroid-stimulating hormone (TSH) levels with normal circulating thyroid hormone concentrations.
  • The relationship between SCH and hypercholesterolemia, particularly in cases with TSH levels at or below 10 mU/l, requires further clarification.

Purpose of the Study:

  • To investigate the association between subclinical hypothyroidism (SCH) and hypercholesterolemia.
  • To determine if this association is present in subjects with SCH and serum TSH levels less than or equal to 10 mU/l.

Main Methods:

  • A cross-sectional study involving 2108 participants from a 1981 community health survey.
  • Serum lipid profiles (total cholesterol, triglycerides, HDL-C, and calculated LDL-C) were measured.

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  • TSH and free T4 concentrations were measured in 2001 from archived sera.
  • Linear regression models were used to compare lipid concentrations between subjects with and without thyroid dysfunction.

    • Main Results:

    • Subjects with SCH exhibited higher serum total cholesterol compared to euthyroid subjects (P < 0.001 unadjusted).
    • In a subgroup analysis, subjects with SCH showed significantly elevated LDL-C levels compared to euthyroid individuals (P = 0.024 adjusted).
    • This elevation in LDL-C was also significant in subjects with SCH and TSH < or = 10 mU/l (P = 0.002 adjusted).

    Conclusions:

    • Subclinical hypothyroidism is associated with increased serum LDL-C concentrations.
    • The association between SCH and elevated LDL-C is statistically significant after adjusting for age, age squared, and sex.
    • These findings suggest a potential link between SCH and dyslipidemia, warranting further investigation into cardiovascular risk.