Research Communications of the 27(th) ECVIM-CA Congress: Intercontinental, Saint Julian's, Malta, 14th to 16th September 2017

Twenty-seven cats were recruited into the study with 21 completing the 12-months follow-up; two were lost at one-month and four at 12-months. Two cats (8%) remained persistently hyperthyroid, of which one underwent repeat radioiodine treatment. Five cats (20%) remained hyperthyroid at one-month but were euthyroid by 6-months. Seven cats (28%) developed overt hypothyroidism over the 12-months (2/7 at one-month, 4/7 at 6months and 1/7 at 12-months) of which two were preceded by subclinical hypothyroidism and none of these cats regained normal thyroid function by 12-months. One cat had subclinical hypothyroidism at 12-months with no further follow-up available. No cats developed transient overt or subclinical hypothyroidism. Of the cats that developed overt hypothyroidism, 4/7 (57%) developed decreased renal function by 12-months. Decreased GFR preceded azotemia development in 2/4 (50%) of these cats.