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The serum digoxin concentration: ten questions to ask

J S Cauffield1, J G Gums, K Grauer

  • 1University of Florida, Gainesville, USA.

American Family Physician
|August 1, 1997
PubMed

Insights

Interpreting serum digoxin concentrations requires careful consideration of individual patient factors. Renal function and drug interactions significantly impact digoxin levels, affecting treatment efficacy and safety.

Area of Science:

  • Cardiology
  • Clinical Pharmacology

Background:

  • Digoxin is a widely used medication for heart failure and arrhythmias.
  • Serum digoxin concentrations are crucial for monitoring treatment effectiveness and toxicity.
  • Digoxin pharmacokinetics are complex and influenced by various patient-specific factors.

Purpose of the Study:

  • To highlight the complexities in interpreting serum digoxin concentrations.
  • To emphasize the importance of considering multiple variables for accurate digoxin level assessment.

Main Methods:

  • Review of existing literature on digoxin pharmacokinetics and therapeutic ranges.
  • Analysis of factors influencing digoxin serum concentrations, including renal function and drug interactions.

Main Results:

  • The therapeutic range for serum digoxin is generally accepted as 0.8 to 2.0 ng/mL.
  • Renal function significantly impacts digoxin elimination and dosing.
  • Concomitant medications like quinidine, amiodarone, and verapamil can substantially increase digoxin levels.

Conclusions:

  • Accurate interpretation of serum digoxin concentrations necessitates a comprehensive evaluation of the patient's clinical status.
  • Consideration of renal function, potential drug interactions, and assay timing is essential for safe and effective digoxin therapy.

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