Related Experiment Videos
Digoxin and its related endogenous factors
1Department of Pathology, University of Louisville School of Medicine, KY 40292, USA.
Critical Reviews in Clinical Laboratory Sciences
|June 1, 1997
Summary
Digitalis drugs, like digoxin, affect the heart by inhibiting the sodium pump. Naturally occurring digitalis-like factors (DLF) in humans may influence sodium pump activity and interfere with digoxin measurements.
Area of Science:
- Pharmacology
- Cardiovascular Physiology
- Biochemistry
Background:
- Digitalis drugs, plant-derived cardenolides, have been used for centuries to treat heart conditions.
- Their primary mechanism involves inhibiting the Na, K-ATPase (sodium pump), affecting cardiac function.
- Recent research suggests endogenous digitalis-like factors (DLF) in mammals may act as hormones regulating the sodium pump.
Purpose of the Study:
- To review the clinical applications of digoxin.
- To examine factors impacting the accuracy of serum digoxin measurements.
- To discuss the measurement of active digoxin metabolites and the interference from DLF.
Main Methods:
- Literature review of digitalis pharmacology and Na, K-ATPase inhibition.
- Analysis of factors affecting digoxin immunoassay accuracy.
- Discussion of endogenous digitalis-like factors (DLF) and their impact.
Main Results:
- Digoxin's inotropic and chronotropic effects are mediated by sodium pump inhibition.
- Naturally occurring DLF, including digoxin-like immunoreactive factor (DLIF) in humans, are increasingly recognized.
- Accurate digoxin measurement for therapeutic drug monitoring (TDM) is challenging due to interfering substances like DLIF.
Conclusions:
- Understanding DLF is crucial for interpreting digoxin levels and optimizing TDM.
- Further research is needed to elucidate the role of endogenous digitalis-like factors.
- Accurate measurement of digoxin requires consideration of its active forms and potential interferents.