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Feline hyperthyroidism
/content/chapter/10.22233/9781910443866.chap19
Feline hyperthyroidism
- Authors: Carmel T. Mooney and Mark E. Peterson
- From: BSAVA Manual of Canine and Feline Endocrinology
- Item: Chapter 19, pp 151 - 168
- DOI: 10.22233/9781910443866.19
- Copyright: © 2023 British Small Animal Veterinary Association
- Publication Date: August 2023
Abstract
Hyperthyroidism is a common endocrine disorder in cats, characterized by excessive levels of the active thyroid hormones triiodothyronine (T3) and/or thyroxine (T4). The aetiology of this condition is obscure and it is difficult to discern the cause of hyperthyroidism from its effects in diseased cats. This chapter provides a comprehensive guide to feline hyperthyroidism, including its prevalence, causes, clinical features, diagnosis and treatment options. The chapter also highlights the importance of monitoring and managing the condition, as well as the potential complications and side effects associated with different treatment modalities.
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/content/chapter/10.22233/9781910443866.chap19
Figures
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19.2
A hyperthyroid 11-year-old Domestic Shorthaired cat showing evidence of (a) weight loss and muscle atrophy and (b) an anxious facial expression.
(Reproduced with permission from
Thoday and Mooney, 1992
) © 2023 British Small Animal Veterinary Association
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19.2
A hyperthyroid 11-year-old Domestic Shorthaired cat showing evidence of (a) weight loss and muscle atrophy and (b) an anxious facial expression.
(Reproduced with permission from
Thoday and Mooney, 1992
)
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19.3
Coat changes in hyperthyroid cats. (a) A 13-year-old Russian Blue cat with extensive matting. (b) A 14-year-old pedigree cat with evidence of alopecia. © 2023 British Small Animal Veterinary Association
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19.3
Coat changes in hyperthyroid cats. (a) A 13-year-old Russian Blue cat with extensive matting. (b) A 14-year-old pedigree cat with evidence of alopecia.
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19.6
Diagnostic algorithm for investigating hyperthyroidism in cats. NTI = non-thyroidal illness; T4 = thyroxine; TSH = thyroid-stimulating hormone. © 2023 British Small Animal Veterinary Association
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19.6
Diagnostic algorithm for investigating hyperthyroidism in cats. NTI = non-thyroidal illness; T4 = thyroxine; TSH = thyroid-stimulating hormone.
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19.10
The progressive decline in serum alanine aminotransferase (ALT) activities in a series of hyperthyroid cats that became euthyroid with carbimazole at a dose of 5 mg q8h.
(Reproduced and modified with permission from
Mooney et al., 1992
). © 2023 British Small Animal Veterinary Association
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19.10
The progressive decline in serum alanine aminotransferase (ALT) activities in a series of hyperthyroid cats that became euthyroid with carbimazole at a dose of 5 mg q8h.
(Reproduced and modified with permission from
Mooney et al., 1992
).
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19.11
Appearance of bilateral thyroid lobe enlargement at the time of surgery. The external parathyroid glands are easily visualized as small spherical pale glands at the cranial pole of each thyroid lobe (cranial is to the right of the image). © 2023 British Small Animal Veterinary Association
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19.11
Appearance of bilateral thyroid lobe enlargement at the time of surgery. The external parathyroid glands are easily visualized as small spherical pale glands at the cranial pole of each thyroid lobe (cranial is to the right of the image).
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19.12
Pertechnetate scans demonstrating (a) unilateral and (b) bilateral thyroid lobe involvement. © 2023 British Small Animal Veterinary Association
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19.12
Pertechnetate scans demonstrating (a) unilateral and (b) bilateral thyroid lobe involvement.
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19.13
Intracapsular thyroidectomy: the thyroid capsule is incised and the thyroid lobe is removed. For the modified intracapsular technique, the capsule is subsequently excised. Drawn by S.J. Elmhurst BA Hons (www.livingart.org.uk) and reproduced with her permission. © 2023 British Small Animal Veterinary Association
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19.13
Intracapsular thyroidectomy: the thyroid capsule is incised and the thyroid lobe is removed. For the modified intracapsular technique, the capsule is subsequently excised. Drawn by S.J. Elmhurst BA Hons (www.livingart.org.uk) and reproduced with her permission.
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19.14
Extracapsular thyroidectomy: the thyroid lobe and capsule are removed whilst preserving vascular supply to the external parathyroid glands. For the modified technique, the thyroid capsule deep to the cranial parathyroid gland is retained. Drawn by S.J. Elmhurst BA Hons (www.livingart.org.uk) and reproduced with her permission. © 2023 British Small Animal Veterinary Association
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19.14
Extracapsular thyroidectomy: the thyroid lobe and capsule are removed whilst preserving vascular supply to the external parathyroid glands. For the modified technique, the thyroid capsule deep to the cranial parathyroid gland is retained. Drawn by S.J. Elmhurst BA Hons (www.livingart.org.uk) and reproduced with her permission.
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19.15
(a) Appearance of a pertechnetate scan in a case of thyroid carcinoma with multiple areas of uptake in the cervical and thoracic regions. (b) Appearance of a large multilobulated thyroid carcinoma as visualized at the time of surgery. © 2023 British Small Animal Veterinary Association
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19.15
(a) Appearance of a pertechnetate scan in a case of thyroid carcinoma with multiple areas of uptake in the cervical and thoracic regions. (b) Appearance of a large multilobulated thyroid carcinoma as visualized at the time of surgery.