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Receptor radioligand system for measuring digoxin activity.

E L Manchester, E Giesbrecht, S J Soldin

Therapeutic Drug Monitoring

|January 1, 1987

Summary

This summary is machine-generated.

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A new receptor radioligand assay (RRA) was developed to measure digoxin and its metabolites. The RRA showed higher digoxin levels compared to fluorescence polarization immunoassay (FPIA) in patients.

Area of Science:

Pharmacology
Analytical Chemistry
Biochemistry

Background:

Digoxin is a critical medication for heart conditions.
Accurate measurement of digoxin levels is essential for therapeutic drug monitoring.
Existing assays may have limitations in sensitivity or specificity.

Purpose of the Study:

To develop and validate a receptor radioligand assay (RRA) for digoxin, its metabolites, and endoxin.
To compare RRA digoxin measurements with a fluorescence polarization immunoassay (FPIA).

Main Methods:

Development of a novel receptor radioligand assay (RRA).
Assay validation using serum samples from healthy volunteers and digoxin-treated patients.
Comparison of RRA results with a commercial fluorescence polarization immunoassay (FPIA).

Related Experiment Videos

Evaluation of potential interferences from other steroids and digoxin metabolites.

Main Results:

The RRA demonstrated within-run coefficients of variation of 21% and 10% at 2.0 and 5.0 nmol/L digoxin, respectively.
Healthy volunteers had digoxin equivalent levels below the assay's lower limit of sensitivity (<1.23 nmol/L).
Digoxin-treated patients showed a mean of 3.39 nmol/L digoxin equivalents by RRA versus 1.75 nmol/L by FPIA.
Potential interferences from specific steroids and digoxin metabolites were assessed.

Conclusions:

The developed RRA is a viable method for measuring digoxin and related compounds.
The RRA consistently yielded higher digoxin concentrations than FPIA in therapeutic drug monitoring.
Further studies are warranted to elucidate the discrepancies between RRA and FPIA results.