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The replacement therapy problem in hypothyroidism.

P J Leslie, A D Toft

    Bailliere'S Clinical Endocrinology and Metabolism
    |August 1, 1988
    PubMed
    Summary
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    Standard thyroxine replacement therapy, even at doses suppressing TSH, may cause subtle changes in organ function. Long-term risks of undertreating subclinical hypothyroidism or slight overtreatment with thyroxine remain unclear.

    Area of Science:

    • Endocrinology
    • Thyroidology

    Background:

    • Standard thyroxine replacement therapy doses can suppress TSH.
    • Subtle changes in target organ function may occur with suppressed TSH levels, resembling mild hyperthyroidism.

    Purpose of the Study:

    • To evaluate the effects of thyroxine replacement therapy on target organ function.
    • To assess the implications of TSH suppression in patients receiving thyroxine.

    Main Methods:

    • Review of studies examining heart rate, liver enzyme activity, bone density, and urinary sodium excretion.
    • Analysis of evidence regarding pituitary thyrotroph recognition of reduced serum thyroid hormone levels.

    Main Results:

    • Thyroxine doses suppressing TSH are associated with target organ function changes, less marked than overt hyperthyroidism.

    Related Experiment Videos

  • Evidence suggests the pituitary thyrotroph detects minor reductions in serum thyroid hormone levels within the normal range.

    • Conclusions:

    • Long-term detrimental effects of slight thyroxine overtreatment or undertreatment of subclinical hypothyroidism are not proven.
    • Good clinical practice suggests treating all thyroid failure grades and adjusting thyroxine to maintain normal, detectable TSH levels using sensitive assays.
    • Patient adherence to medication poses a greater morbidity risk than minor thyroxine dose adjustments by clinicians.