Peer-reviewed veterinary case report
Feline hyperthyroidism rates and risks in South Africa cats
By McLean, Joanne L et al.·Published in Journal of feline medicine and surgery·2017·1 Department of Companion Animal Clinical Studies·View original on PubMed →
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Original publication title: Prevalence of and risk factors for feline hyperthyroidism in South Africa.
- Species:
- cat
Plain-English summary
A study found that about 7% of older cats in South Africa have hyperthyroidism, a condition that can cause symptoms like weight loss and a fast heart rate. Cats aged 12 years and older and those that eat canned food were more likely to be diagnosed with this disorder. Interestingly, the study showed no significant links between hyperthyroidism and factors like vaccinations or living indoors. If your older cat is losing weight or seems more active than usual, it might be worth discussing hyperthyroidism with your veterinarian.
People also search for: cat weight loss symptoms · hyperthyroidism in older cats · canned food and cat health · fast heart rate in cats
Abstract
Objectives Hyperthyroidism is a disorder of older cats that may have a geographical variation in prevalence. Prevalence studies have not yet been performed in South Africa, a geographical area where hyperthyroidism in cats has recently been observed and where, reportedly, the incidence appears to be increasing. The purpose of this study was to determine the prevalence of feline hyperthyroidism in South Africa and to identify any potential risk factors. Further information on the worldwide prevalence and possible causative factors would increase our understanding of the aetiology of this disease and help identify any preventive measures. Methods Serum total thyroxine (tT4) and canine thyroid-stimulating hormone (cTSH) were measured in 302 cats aged 9 years and older that were presented at various veterinary clinics throughout South Africa. In cats with equivocal tT4 and undetectable cTSH values, serum free thyroxine (fT4) was also measured. At the time of blood sampling a questionnaire was completed regarding vaccination history, internal and external parasite control, diet and environment. Results Prevalence of hyperthyroidism (tT4 >50 nmol/l or tT4 between 30 and 50 nmol/l with TSH <0.03 ng/ml and fT4 >50 pmol/l) was 7% (95% confidence interval 4.4-10.4), with no significant difference between healthy (5%) and sick (8%) cats. Cats ⩾12 years of age (odds ratio [OR] 4.3, P = 0.02) and cats eating canned food (OR 2.1, P = 0.1) were more likely to be diagnosed with hyperthyroidism. No significant relationship between vaccinations, parasite control or indoor environment and hyperthyroidism was observed. Hyperthyroid cats were more likely to present with weight loss (OR 3.2, P = 0.01) and with a heart rate ⩾200 beats per min (OR 5, P = 0.01) than cats without the disease. Conclusions and relevance Hyperthyroidism does not appear to be uncommon in the South African cat population. Risk factors for hyperthyroidism, specifically older age and eating canned food, were present in this as in other reported populations.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/28826266/