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Hyperthyroidism in the cat: ten cases

J Holzworth, P Theran, J L Carpenter

    Journal of the American Veterinary Medical Association
    |February 15, 1980
    PubMed
    Summary
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    Hyperthyroidism in older cats causes weight loss and hyperactivity. Surgical thyroidectomy is an effective treatment, though some cats may need lifelong thyroid hormone replacement therapy.

    Area of Science:

    • Veterinary Medicine
    • Endocrinology

    Background:

    • Hyperthyroidism is a common endocrine disorder in older cats.
    • Clinical signs include weight loss, increased appetite, and cardiac abnormalities.

    Observation:

    • Ten senior cats (10-14 years) presented with classic hyperthyroid signs.
    • Physical examination revealed enlarged thyroid lobes in most cats.
    • Serum thyroxine (T4) and triiodothyronine (T3) levels were elevated, confirming the diagnosis.

    Findings:

    • Microscopic examination revealed adenomatous goiter in all affected thyroid lobes.
    • Two cats had concurrent adenocarcinoma foci, and two others had suspicious lesions.
    • Surgical thyroidectomy was performed in seven cats, with most recovering well.
    • Transient hypoparathyroidism occurred in two cats post-bilateral thyroidectomy, managed with calcium and vitamin D2.

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  • Cats undergoing bilateral thyroidectomy required long-term thyroid hormone supplementation (l-thyroxine or liothyronine).

    • Implications:

    • Surgical thyroidectomy is a viable treatment for feline hyperthyroidism.
    • Careful parathyroid gland preservation and postoperative monitoring are crucial.
    • Lifelong hormone replacement therapy is often necessary after total thyroidectomy.