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  • Title: Endogenous digoxin-like substance(s) associated with uneventful and high-risk pregnancies.
    Author: Koren G, Farine D, Grundmann H, Heyes J, Soldin S, Taylor J, MacLeod SM.
    Journal: Dev Pharmacol Ther; 1988; 11(2):82-7. PubMed ID: 3371149.
    Abstract:
    We assessed the existence of endogenous digoxin-like substance(s) (EDLS) in mother-neonate pairs using a routine radioimmunoassay for digoxin. None of those studied had been treated with cardiac glycosides during or before pregnancy. In uneventful pregnancies, cord EDLS levels (0.31 +/- 0.02 ng/ml mean +/- SEM) were significantly higher (p less than 0.001) than both antepartum and postpartum maternal levels (0.14 +/- 0.02 and 0.17 +/- 0.02 mg/ml, respectively). This observation was in contrast with findings in high-risk pregnancies. In general, EDLS levels in the high-risk group were significantly higher than in normal pregnancies (cord 0.94 +/- 0.38 ng/ml; antepartum 1.63 +/- 0.54 ng/ml; postpartum 0.89 +/- 0.73 ng/ml). In the high-risk group there was a remarkably wide range of maternal and cord EDLS concentrations. The present studies suggest that following pregnancies of high risk for a variety of reasons, EDLS determination may be commonly high in the perinatal period and may affect the determination of 'true' digoxin. Consequently, digoxin dosing based on monitoring drug concentration may be futile.
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