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Radioactive iodine therapy in cats with hyperthyroidism.

J M Turrel, E C Feldman, M Hays

    Journal of the American Veterinary Medical Association
    |March 1, 1984
    PubMed
    Summary

    Radioactive iodine (131I) therapy offers a viable treatment for feline hyperthyroidism, successfully normalizing thyroid function in most cats. While dosimetry requires further refinement, 131I ablation presents a promising alternative to other treatments.

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    Area of Science:

    • Veterinary Medicine
    • Endocrinology
    • Nuclear Medicine

    Background:

    • Hyperthyroidism is a common endocrine disorder in cats.
    • Previous treatments like hemithyroidectomy and antithyroid drugs have shown variable success.
    • Radioactive iodine (131I) therapy is an established treatment for hyperthyroidism.

    Purpose of the Study:

    • To evaluate the efficacy and outcomes of radioactive iodine (131I) treatment in cats with hyperthyroidism.
    • To assess the delivered radiation dose and its correlation with treatment success.
    • To determine if 131I ablation is a suitable alternative for managing feline hyperthyroidism.

    Main Methods:

    • Eleven cats with hyperthyroidism received radioactive iodine (131I) therapy.
    • Thyroid scans using technetium 99m were performed to assess gland size and radionuclide uptake.

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  • Serum thyroxine levels were measured to confirm hyperthyroidism.
  • Radioactive iodine uptake (RAIU) and half-lives were determined to calculate administered 131I activity.
  • Dosimetry calculations aimed for 20,000 rad, with actual doses retrospectively determined.

    • Main Results:

    • Complete resolution of hyperthyroidism (euthyroidism) was achieved in 7 out of 11 cats.
    • Two cats showed partial response, and two cats developed hypothyroidism post-treatment.
    • Actual radiation doses ranged significantly from 7,100 to 64,900 rad.
    • Thyroid scans indicated thyroid lobe enlargement and increased radionuclide accumulation in most cats.

    Conclusions:

    • Radioactive iodine (131I) ablation is a reasonable alternative for treating feline hyperthyroidism.
    • The treatment effectively normalized thyroid function in a majority of treated cats.
    • Further research is needed to optimize dosimetry calculations for 131I therapy in cats.