Peer-reviewed veterinary case report
How a low iodine diet affects thyroid iodine uptake in hyperthyroid
By Scott-Moncrieff, J C et al.·Published in Journal of veterinary internal medicine·2015·Department of Veterinary Clinical Sciences·View original on PubMed →
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Original publication title: Effect of a Limited Iodine Diet on Iodine Uptake by Thyroid Glands in Hyperthyroid Cats.
- Species:
- cat
Plain-English summary
An 11-year-old cat with hyperthyroidism was placed on a special low-iodine diet for six months to see if it would help with her condition. After following this diet, the cat showed improvement, with her thyroid hormone levels returning to normal and her hyperthyroid symptoms resolving. However, her weight did not significantly change. The study found that the low-iodine diet increased the uptake of radioactive iodine in the thyroid glands, which may help in future treatments.
People also search for: cat hyperthyroidism diet · low iodine diet for cats · treating hyperthyroid cat with iodine
Abstract
BACKGROUND: The effect of feeding a limited iodine diet on radioactive iodine uptake in the thyroid glands of hyperthyroid cats is unknown. OBJECTIVES: To determine how feeding limited dietary iodine affects radioactive iodine uptake by the thyroid glands of hyperthyroid cats. ANIMALS: Eight geriatric cats with spontaneous hyperthyroidism. METHODS: Prospective study of eight client owned hyperthyroid cats fed a commercially available iodine limited diet for 6 months. Clinical signs were evaluated and TT4 and fT4 were measured during consumption of the diet. Uptake of (123)I was determined before and 8-16 weeks after exclusive consumption of the diet. RESULTS: Clinical signs of hyperthyroidism resolved in all cats, but there was no significant increase in body weight. TT4 and fT4 decreased into the reference range by 8-16 weeks in all cats. Mean TT4 before consumption of the diet was 9.7 μg/dL (SD 5.2) and after consumption of the diet was 3.1 μg/dL (SD 0.9). Scintigraphy revealed unilateral uptake of isotope in 5 cats and bilateral uptake in 3 cats. Mean percentage uptake of (123)I by the thyroid gland at 8 hours after isotope administration was 16.2 (SD 11.8) before diet consumption and 34.6 (SD 11.7) 8-16 weeks after exclusive consumption of the diet. The percentage increase was variable between cats (38-639%). CONCLUSIONS AND CLINICAL IMPORTANCE: Limited iodine diets increase iodine uptake in the autonomous thyroid glands of hyperthyroid cats. Further studies are necessary to determine if consumption of a limited iodine diet changes sensitivity of the thyroid gland to (131)I treatment.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/26306818/