Behandling av hypertyreoidism hos katt med radioaktivt jod : en uppföljning av 46 fall

Abstract: 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.