Researchers evaluated one thousand and four hundred hyperthyroid cats treated with Radioiodine 131I.

Cats with persistent hyperthyroidism had many predictive factors that directly contrasted those of cats that developed 131I-induced hypothyroidism.

Cats that developed iatrogenic hypothyroidism were more likely to be older, female. They also were more likely to have detectable serum thyroid-stimulating hormone (TSH) concentrations, and have bilateral thyroid nodules.

In contrast, cats remaining persistently hyperthyroid were more likely to be younger, have higher severity score, and have lower 131I uptake.

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Predicting outcomes in hyperthyroid cats treated with radioiodine