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  • Title: [Serum level of digoxin and digitoxin and glomerular filtration rate in hyper- and hypothyroidism].
    Author: Juhl-Johnsen C, Kokenge F, Kolenda KD.
    Journal: Dtsch Med Wochenschr; 1983 Mar 11; 108(10):378-83. PubMed ID: 6825578.
    Abstract:
    In a comparative prospective study the serum levels of digoxin and digitoxin and the glomerular filtration of the kidneys were determined radioimmunologically in thyroid function disorders using the endogenous creatinine clearance and the 51Cr-EDTA clearance. Compared to a euthyroid control group 17 patients with hyperthyroidism showed a decreased and 5 patients with hypothyroidism showed a largely toxic digoxin level, both groups being on a maintenance therapy of 0.25 mg digoxin b. i. d. During an oral maintenance therapy of daily 0.1 mg digitoxin unchanged therapeutic serum levels were found in 35 hyperthyroid and 18 hypothyroid patients when compared to a euthyroid control group. Assessment of clearances showed that glomerular filtration rates were clearly increased in the hyperthyroid and lowered in the hypothyroid patients. Renewed assessment of the clearance in four hyperthyroid patients and three with hypothyroidism after thyroid recompensation showed a marked decrease of clearance values in hyperthyroidism and an increase in hypothyroidism. Increased clearance values in hyperthyroidism were associated with lowered digoxin serum levels. In contrast, lowered clearance values in hypothyroidism were accompanied by increased serum digoxin levels. There was no such association detectable for digitoxin.
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