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[The influence of primidone on thyroid function (author's transl)]
Insights
Primidone treatment in children may lower thyroxine (T4) levels and increase the T3/T4 ratio, but thyroid-stimulating hormone (TSH) levels remain normal, indicating a euthyroid state. This suggests primidone might enhance T4 breakdown in the liver.
Area of Science:
- Endocrinology
- Pharmacology
- Pediatrics
Context:
- Long-term primidone treatment is used in children.
- Thyroid hormone levels and function require careful monitoring during such treatments.
- The impact of primidone on thyroid hormone dynamics is not fully understood.
Purpose:
- To investigate the effects of long-term primidone treatment on thyroid hormone levels in children.
- To assess thyroid function using TSH stimulation tests in children on primidone.
- To compare thyroid hormone profiles of primidone-treated children with a normal control group.
Summary:
- Primidone treatment in 30 children led to decreased thyroxine (T4) and free thyroxine (FT4) index levels.
- An increased triiodothyronine (T3) RIA/T4 RIA quotient was observed, while T3 levels and T3 index remained unchanged.
- Basal and stimulated TSH levels were not significantly different from controls, suggesting a euthyroid state despite altered T4 levels.
Impact:
- Primidone may stimulate hepatocellular thyroxine breakdown, affecting peripheral thyroid hormone metabolism.
- Children on long-term primidone therapy appear to maintain euthyroid status as indicated by TRH testing.
- Findings contribute to understanding the pharmacological effects of primidone on the thyroid axis in pediatric populations.
Abstract:
The influence of primidone on thyroxine level, T3 index, FT4 index, triiodothyronine level, T3 (RIA)/T4 (RIA) quotient as well as on the TSH basal and stimulated values was investigated in 30 children on long-term treatment. The values obtained were compared statistically with those of a normal group. During primidone treatment a drop in T4 level and in FT4 index as well as an increase in T3 (RIA)/T4 (RIA) quotient was observed. On the other hand the triiodothyronine level and the T3 index were not influenced. The TSH basal and stimulated values were not statistically different from the control group. Thus the primidone-treated children are euthyroid according to the TRH test. Primidone probably stimulates hepatocellular thyroxine breakdown.