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• W2006013913 abstract "Amiodarone (2-n-butyl-3,4'-diethylaminoethoxy-3', 5'-diiodobenzoyl-benzofurane) is an antiarrhythmic drug which increases serum T4 and rT3 levels in patients and lowers serum T3 levels. To investigate its effects on T4 metabolism and its cardiac action, we fed amiodarone to male Fisher rats at doses of 5, 15, and 45 mg/kg BW X day; controls received potassium iodide for 4-7 weeks, and another group received sodium ipodate. At 4 weeks, amiodarone caused a dose-dependent increase in the serum T4 concentration and a slight reduction of serum TSH without a change in the serum T3 concentration. These changes were not present at 7 weeks. Sodium ipodate raised serum T4 concentrations at both times. Rats treated with T4 (150 micrograms/kg BW X day) to suppress thyroidal secretion of hormone and with amiodarone (15 mg/kg) had marked reduction of serum T3 concentrations compared with controls receiving T4 without amiodarone. Liver homogenates from rats treated with amiodarone showed marked reduction on T4 5'-monodeiodinase activity in a dose-related manner. Amiodarone added to liver homogenates in vitro at concentrations of 0.001-1 mM did not inhibit T3 production from T4, whereas ipodate added in vitro (0.01-1 mM) did inhibit T3 production. Rats treated with amiodarone showed a lowering of the resting heart rate and a reduction of the increment in heart rate after iv isoproterenol administration. The cardiac Ca++ myosin ATPase activity was reduced in rats receiving amiodarone (45 mg/kg) compared with that in controls. The data indicate that rats treated with amiodarone have reduced peripheral conversion of T4 to T3 owing to impaired hepatic T4 5'-monodeiodinase activity. In addition, these rats have slowing of heart rate and reduction of cardiac Ca++ myosin ATPase activity. These findings are consistent with the hypothesis that amiodarone blocks some effects of thyroid hormone on the heart, but additional studies are needed to test this hypothesis." @default.
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• W2006013913 date "1983-10-01" @default.
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• W2006013913 title "The Effects of Amiodarone on Serum Thyroid Hormones and Hepatic Thyroxine 5′-Monodeiodination in Rats*" @default.
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• W2006013913 doi "https://doi.org/10.1210/endo-113-4-1464" @default.
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