Behandling av hypertyreoidism hos katt med radioaktivt jod
en uppföljning av 46 fall
Hyperthyroidism has become the most commonly diagnosed endocrine disorder in
cats. The recommended treatment of choice in the literature is administration of
radioactive iodine. This treatment has been available at a few veterinary clinics in
Sweden since 1999. Forty-six cats treated with a standard dose (80 MBq) of
radioactive iodine (131I) at the Swedish University of Agricultural Sciences in the
period 2000-2004 were followed for a median of 13 months (range 3-42 months)
by means of a retrospective cohort study design. Tables predicting time of survival
after treatment were made.
At final follow-up thirty-nine cats (85%) were euthyroid, six cats (13%) remained
hyperthyroid and one cat (2%) was hypothyroid. The seven cats which were
hyperthyroid at the six-weeks follow-up had significantly higher serum thyroxin
values before treatment than the cats that became euthyroid (p=0,015). Seventy-five
per cent of the cats (median age 13 years) are estimated to survive 13 months posttreatment,
which is comparable to other similar studies.
Possible improvements of the handling of these cases such as the calculation of
acquired dose of radioactive iodine is discussed in this article.