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Human serum and myocardium digoxin.

G Härtel, K Kyllönen, E Merikallio

Clinical Pharmacology and Therapeutics

|February 1, 1976

Summary

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Serum digoxin levels correlate with heart muscle concentrations in patients. This finding supports using serum digoxin to monitor heart digitalization levels effectively.

Area of Science:

Cardiology
Pharmacology
Cardiac Surgery

Background:

Digoxin is a cardiac glycoside used to treat heart failure and arrhythmias.
Accurate monitoring of digoxin levels is crucial for therapeutic efficacy and preventing toxicity.
Myocardial tissue concentration is a direct measure of drug effect, but difficult to obtain.

Purpose of the Study:

To investigate the correlation between serum digoxin concentrations and digoxin concentrations in myocardial tissue (papillary muscle).
To determine the ratio of myocardial tissue to serum digoxin concentrations.
To evaluate the utility of serum digoxin levels as a surrogate marker for myocardial digoxin levels.

Main Methods:

Patients undergoing mitral valve surgery were included in the study.

Related Experiment Videos

Serum samples and papillary muscle tissue samples were collected.

Digoxin concentrations in both serum and tissue were measured and analyzed for linear correlation.

Main Results:

A significant linear correlation was found between serum digoxin and papillary muscle digoxin concentrations.
The mean ratio of myocardial tissue to serum digoxin concentration was determined to be 6711.
This ratio indicates a substantial accumulation of digoxin in cardiac tissue relative to serum.

Conclusions:

Serum digoxin concentration is a reliable indicator of myocardial tissue digoxin concentration under steady-state conditions.
The established ratio can aid in interpreting serum digoxin levels in the context of cardiac tissue drug levels.
These findings support the clinical use of serum digoxin measurements for guiding digoxin therapy and assessing digitalization.