Serum thyroxine concentrations after radioactive iodine therapy in cats with hyperthyroidism

Journal Article · Thu May 01 04:00:00 EDT 1986 · J. Am. Vet. Med. Assoc.; (United States)

OSTI ID:5204818

Meric, S M; Hawkins, E C; Washabau, R J; Turrel, J M; Feldman, E C

Thirty-one cats with hyperthyroidism were given one dose of radioactive iodine (131I) IV. Serum thyroxine (T4) concentrations were measured before treatment in all cats, at 12-hour intervals after treatment in 10 cats, and at 48-hour intervals after treatment in 21 cats. Serum T4 concentrations also were measured one month after /sup 131/I therapy in 29 cats. Activity of 131I administered was 1.5 to 6.13 mCi, resulting in a dose of 20,000 rads to the thyroid. Serum T4 concentrations before /sup 131/I administration were 5.3 to 51.0 micrograms/dl, with a median T4 concentration of 11.0 micrograms/dl. Serum T4 decreased most rapidly during the first 3 to 6 days after treatment. Sixteen cats (55%) had normal serum thyroxine concentrations by day 4 after 131I administration, and 23 cats (74%) were euthyroxinemic by day 8 after treatment. One month after administration of 131I, the 29 cats evaluated were clinically improved, and 24 (83%) of the 29 cats evaluated had normal serum T4 concentrations, 3 cats (10%) remained hyperthyroxinemic, and 2 cats (7%) were hypothyroxinemic. Therefore, administration of 131I was a safe and effective method to quickly decrease serum T4 concentrations in hyperthyroid cats.

• Research Organization: Univ. of California, Davis
• OSTI ID: 5204818
• Journal Information: J. Am. Vet. Med. Assoc.; (United States), Journal Name: J. Am. Vet. Med. Assoc.; (United States) Vol. 9; ISSN JAVMA
• Country of Publication: United States
• Language: English

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550604* -- Medicine-- Unsealed Radionuclides in Therapy-- (1980-)
560162 -- Radionuclide Effects
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& Toxicology-- Animals
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62 RADIOLOGY AND NUCLEAR MEDICINE
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AMINO ACIDS
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL MODELS
BLOOD CHEMISTRY
BLOOD SERUM
BODY
CARBOXYLIC ACIDS
CATS
DAYS LIVING RADIOISOTOPES
DISEASES
DOSES
ENDOCRINE DISEASES
ENDOCRINE GLANDS
GLANDS
HORMONES
HYPERTHYROIDISM
INTERMEDIATE MASS NUCLEI
IODINE 131
IODINE ISOTOPES
ISOTOPES
MAMMALS
MEDICINE
NUCLEAR MEDICINE
NUCLEI
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
ORGANS
PEPTIDE HORMONES
RADIATION DOSES
RADIOISOTOPES
RADIOLOGY
RADIOTHERAPY
THERAPY
THYROID
THYROID HORMONES
THYROXINE
VERTEBRATES