VETERNINARY NUCLEAR MEDICINE - RAYMOND J. MORDANDI - FELINE HYPERTHYROIDISM


THE TREATMENT OF CHOICE FOR FELINE HYPERTHYROIDISM

     The treatment is a single injection of Radioisotope (I-131). The iodine is absorbed by the thyroid tumor and the tumor is destroyed in almost all cats treated. The cat does not require anesthesia or any other invasive procedure besides the one injection. There are usually no harmful side effects. Healthy thyroid tissue and the associated parathyroids are not destroyed. Within one to three months thyroid function should return to normal. No thyroid supplementation is normally required. We suggest that your cat be taken to your veterinarian for re-evaluation one month after treatment.

     A complete physical exam of your cat is required by your veterinarian with T3 and T4 values taken within 2 weeks of treatment. Also, your veterinarian must x-ray the heart and lungs to evaluate heart size and any possible lung malignancy. The cat must be in condition to withstand the stress of being away from the home and isolation for 3 days. If the cat is on tapazole treatment, it must be withheld for 7 to 14 days before the I-131 can be administered.

     The state has very rigid requirements on the exposure of humans to any radioisotope. Therefore, after the I-131 is administered to your cat, attendants and veterinarians can only feed the animal, clean the cage and evaluate the cat's physical condition. The long exposure needed for any special treatment would be prohibitive. We adjust room temperature accordingly, leave the lights on and play soft music in the isolation area.

     The cat must remain in isolation until the level of radiation is safe. After the cat is released, a few precautionary measures should be taken for the next 2 weeks. We suggest that litter pan liners be used in the litter box and disposable gloves be worn when cleaning the box. It is best not to let your cat sleep with you or snuggle up too long for this 2 week period. After any close contact, it is wise to wash hands. It is best for pregnant women and children not to care for the cat during this 2 week period. The regulation for using I-131 on animals is much more rigid than when used on people.

For information on feline hyperthyroidism or to make an appointment, please contact us.



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