Although every effort is made to calculate the correct
dose of radioiodine for each patient, not every treatment will successfully correct the hyperthyroidism, particularly if the goiter is quite large and a second dose of radioactive iodine is occasionally needed.
The availability
of radioiodine for cats is limited to hospitals with radioisotope permits.
The antithyroid medications may increase the
uptake of radioiodine inito the normal thyroid tissue and increase the possibility of hypothyroidism after therapy.
The Saul Hertz, MD Award SNMMI has established The Dr. Saul Hertz Lifetime Achievement Award in honor of the professional achievements of Dr. Hertz as the pioneer
of Radioiodine Therapy.
The only way to determine the proper dose
of radioiodine in these cats is to calculate the tumor volume by thyroid scanning.
We've been told that he is otherwise healthy, and our veterinarian has told us about the
possibility of radioiodine therapy, but we're concerned about the effects of the radiation on him and our family.
This is an ultra-low dose, compared to the higher doses
of radioiodine of 3.5 - 5 mCi generally administered to all cats by treatment facilities that do not do thyroid scans to measure the tumor volume.
A single
injection of Radioiodine (I - 131) cures 98 - 99 % of Feline Hyperthyroidism cases without any adverse side effects
Our Tacoma office was established to treat cats in the Tacoma region that require low
doses of radioiodine, i.e. a T4 level of less than 14.
Therefore, most endocrinologists strive to completely destroy the diseased thyroid gland with a single dose
of radioiodine.
The doses
of radioiodine are supplied in.5 ml quantity.
After the one - time injection
of radioiodine, it can take one to three months for your cat's thyroid to heal and return to normal.
Our Tacoma office was established to treat cats that require low doses
of radioiodine, i.e. a T4 level of less than 14.
Medical management for any length of time can make therapy with radioiodine more difficult by allowing the abnormal thyroid tissue to continue to grow which then requires higher doses
of radioiodine and therefore a longer hospital stay for the cat.
This is simple, it is a safe, and is a single subcutaneous injection
of Radioiodine (I - 131).
Peterson ME, Broome MR. Ultra-low doses
of radioiodine are highly effective in restoring euthyroidism without inducing hypothyroidism in most cats with milder forms of hyperthyroidism: 131 cases.
Most recently diagnosed hyperthyroid cats that we treat will require very low doses
of radioiodine (< 2 mCi).