Rapid plasma digoxin assay in outpatients--a useful routine technique?

Area of Science:

• Cardiology
• Clinical Pharmacology

Background:

• Digoxin is a common treatment for chronic atrial fibrillation.
• Plasma digoxin assays offer rapid results.
• Clinical assessment is the traditional method for digoxin dose selection.

Purpose of the Study:

• To evaluate the impact of rapid plasma digoxin assay results on dose selection in outpatients with atrial fibrillation.
• To determine if advanced assays improve upon clinical assessment for digoxin dosing.

Main Methods:

• Prospective study of 25 outpatients with chronic atrial fibrillation.
• Dose selection based on clinical assessment.
• Comparison with results from rapid plasma digoxin assays.

Main Results:

• Only one case out of 25 showed a dose alteration due to rapid assay results.
• No patients exhibited digoxin toxicity, even with renal impairment.
• Larger digoxin doses for uncontrolled ventricular rates were manageable via clinical assessment alone.

Conclusions:

• Simple clinical monitoring is adequate for selecting digoxin doses in most atrial fibrillation patients.
• Rapid digoxin assays have limited impact on outpatient dose adjustments.
• Clinical assessment remains a reliable method for digoxin management in atrial fibrillation.