From the Department of Medicine, Taleghani Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran.
Abstract: (6493 Views)
The response to methimazole [1-methyl-2-mercapto-imidazole (MMI)]
therapy, 10 mg twice daily in 15 patients and propylthiouracil (P TU) therapy,
100mg twice daily in 10 patients with diffuse toxic goiter was evaluated in an
area of iodine deficiency (Tehran).
The mean free T4 index (FT4I) decreased from 22.7± 6.8 (± SD) to
10.8± 2.8 In MMI-treated, and from 25.1± 6.8 to 13.2± 2.1 in PTU-treated
patients, two weeks after treatment. The FT4I further decreased to 6.8± 4.3
and 8.5± 2.1 after four weeks of MMI and PTU administration, respectively.
The mean free T3 index (FT3I) was 415± 90, 162± 44 and 117± 46 in MMI
treated and 430± 80, 210± 45 and 140± 53 in PTU treated patients before
and two and four weeks after treatment, respectively. The mean FT4I and
FT 31 had decreased more in the MMI treated groups as compared to the PTU
treated patients, two weeks after treatment. In patients treated with MMI or
PTU, 11 of 25 (44 %) had subnormal FT 41 after four weeks of treatment, of
whom one had increased serum TSH.
These results indicate that treatment with less than the recommended
doses of thionamide compounds causes a rapid decline of thyroid hormone
indices in patients residing iI). Tehran. The dosage of thionamide compounds
as well as the duration of therapy with the initial doses necessary to induce
euthyroidism, should be evaluated in various parts of the world.