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Radioactive iodine (I-131) therapy
For most cats with hyperthyroidism, radioactive iodine is the gold standard treatment. It is available at Auckland Veterinary Hospital in Glen Eden, for cats from any of our clinics and by referral from other vets.
About the condition
Hyperthyroidism is a common hormone disease in older cats, usually from around 9 to 10 years of age, although it can appear from 5 years. In most cases a non-cancerous growth of thyroid cells produces too much thyroid hormone.
Left untreated, it can cause major weight loss, a big appetite (or sometimes a poor one), muscle weakness, heart disease and intolerance to stress.
How it works
The thyroid is the only tissue in the body that actively absorbs iodine. The overactive thyroid tissue takes up the radioactive iodine, which treats it, while normal thyroid tissue is largely left alone.
At Auckland Veterinary Hospital the dose is given as an injection under the skin, usually with light sedation to keep your cat and our team safe.
What to expect
Please talk to your local clinic about I-131 for your cat. They can check suitability and arrange the referral.
It depends on the dose your cat needs. Most cats stay 7 days, and a longer stay can be arranged if required.
A veterinary nurse sees your cat every day for feeding, water, litter and cleaning. Bring your cat's usual food to avoid tummy upsets. A familiar blanket helps them settle, but it can't be returned because of radiation safety.
For 2 weeks your cat must stay indoors, avoid close contact with children and pregnant people, and not sleep in the same room as anyone. Wash your hands after handling them, and bag used litter separately. If this isn't possible, an extra cattery stay can be arranged.
Thyroid levels and kidney values are checked at 1 month and 3 months. Around 5% of cats need a second treatment. I-131 does not cause kidney disease, but treating hyperthyroidism can reveal existing kidney issues.
For veterinarians
I-131 therapy is available at Auckland Veterinary Hospital only. To refer a patient or discuss suitability, please email our Auckland team.
Email auckland@vethospital.co.nzVets please use the form below to refer a case.
For further information or to discuss case suitability please email auckland@vethospital.co.nz