Efficacy Study of an Iodine-Restricted Diet for Hyperthyroidism
A study was performed to determine the efficacy of a therapeutic iodine-restricted diet during a 12 -month interval in cats with moderately to severely increased total thyroxine (TT4) concentrations.
Eight confirmed hyperthyroid cats were monitored. Each cat underwent an initial physical examination, complete blood count, serum chemistry panel, thyroid profile, thyroid scintigraphy, and echocardiogram. Physical examination and all blood samplings were repeated at 1, 2, 3, 6, and 12 months after enrollment. Clients were instructed to feed only the therapeutic iodine-restricted diet throughout the entire study. Six out of eight cats had normal serum TT4 after 4 weeks of feeding the therapeutic diet. The two cats that did not achieve normalization of TT4 at 4 weeks had the highest initial TT4 concentrations. Three cats were withdrawn from the study due to emergence of chronic kidney disease.
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