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Clinical hypothyroidism in the elderly--a preventable disorder?

R L Rosenbaum, U S Barzel

    Journal of the American Geriatrics Society
    |May 1, 1981
    PubMed
    Summary
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    Elderly patients with hypothyroidism require lower thyroxine dosages. Identifying "failing thyroid syndrome" (FTS) early prevents clinical hypothyroidism and guides appropriate thyroid hormone replacement therapy.

    Area of Science:

    • Geriatric Endocrinology
    • Thyroidology
    • Internal Medicine

    Background:

    • Hypothyroidism is common in the elderly, often requiring thyroxine replacement therapy.
    • Age-related physiological changes can alter thyroid hormone metabolism and requirements.
    • Subtle thyroid dysfunction, like "failing thyroid syndrome" (FTS), may present asymptomatically in older adults.

    Purpose of the Study:

    • To investigate the characteristics of hypothyroidism and thyroxine replacement in ambulatory aged patients.
    • To identify asymptomatic patients with subnormal thyroid function (FTS) and assess their treatment needs.
    • To determine age- and weight-adjusted thyroxine dosages to prevent toxicity in the elderly.

    Main Methods:

    • Retrospective analysis of 27 ambulatory elderly patients on thyroxine therapy.

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  • Categorization into 'failing thyroid syndrome' (FTS) and frank clinical hypothyroidism.
  • Evaluation of serum thyroid-stimulating hormone (TSH) and thyroid hormone levels.

    • Main Results:

    • Four patients (15%) presented with asymptomatic FTS, characterized by high TSH and normal thyroid hormones.
    • FTS patients and those with clinical hypothyroidism required lower initial thyroxine dosages compared to younger adults.
    • A reduced thyroxine dosage is necessary for complete replacement in the elderly due to age-related metabolic changes.

    Conclusions:

    • Routine TSH screening in at-risk elderly patients (e.g., history of Graves' or Hashimoto's) can detect incipient hypothyroidism.
    • Early identification of FTS allows for timely intervention, potentially preventing overt clinical hypothyroidism.
    • Thyroxine dosage must be individualized based on age and body weight to avoid toxicity in the sensitive elderly population.