Peer-reviewed veterinary case report
Thyroid size does not affect radioiodine success in hyperthyroid cats
By Volckaert, Veerle et al.·Published in Journal of feline medicine and surgery·2016·Faculty of Veterinary Medicine·View original on PubMed →
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Original publication title: Effect of thyroid volume on radioiodine therapy outcome in hyperthyroid cats.
- Species:
- cat
Plain-English summary
A group of hyperthyroid cats undergoing radioiodine therapy was studied to see how their thyroid size affected treatment success. The results showed that while thyroid volume alone didn't significantly predict whether the treatment would lower thyroid hormone levels, having multiple affected areas in the thyroid did improve the chances of a successful outcome. This means that if a cat has several problem areas in its thyroid, it might respond better to the therapy. Overall, radioiodine therapy remains a highly effective option for treating hyperthyroid cats, with success rates between 85-95%.
People also search for: hyperthyroid cat treatment · radioiodine therapy for cats · cat thyroid problems symptoms
Abstract
Radioiodine therapy is commonly used in hyperthyroid cats and has a high success rate, ranging from 85-95%. As in humans, thyroid volume has been reported to influence radioiodine therapy outcome in hyperthyroid cats. The purpose of this study was to relate total thyroid volume, calculated by a newly constructed formula for feline patients (0.438 × length × width²), to the outcome of radioiodine therapy. To search for a correlation between total thyroid volume and therapy outcome, 167 hyperthyroid cats were included. Patients were categorised according to the administered radioiodine dose and therapy outcome. Our analysis did not show a significant relationship between an increasing total thyroid volume and the odds for a final low total thyroxine concentration (TT4; P = 0.3930) or a final hyperthyroid outcome (P = 0.0901). A significant relationship was found for an increase in the odds for a final low TT4 outcome with an increase in the number of foci detected on the pertechnetate thyroid scan (P = 0.0238). This was not true for a final hyperthyroid outcome (P = 0.7435). The number of detected foci was also significantly associated with the total thyroid volume (P = 0.0006). Findings indicated that the presence of multiple affected foci influences therapy outcome towards a low TT4 outcome. Bilateral hyperthyroidism and its potential effect on a final low TT4 outcome should therefore be addressed when informing owners of the possible outcomes of radioiodine therapy for their cat.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/25769623/