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Related Experiment Videos

Amiloride-quinidine interaction: adverse outcomes

L Wang1, R S Sheldon, L B Mitchell

  • 1Cardiovascular Research Group, University of Calgary, Alberta, Canada.

Clinical Pharmacology and Therapeutics
|December 1, 1994
PubMed
Summary
This summary is machine-generated.

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Combining amiloride and quinidine for antiarrhythmic therapy led to adverse effects in most patients. This drug combination may increase proarrhythmic risks due to enhanced sodium channel blockade.

Area of Science:

  • Cardiology
  • Pharmacology

Background:

  • Drug combinations can yield beneficial antiarrhythmic effects.
  • The interaction between amiloride and quinidine for antiarrhythmic purposes requires investigation.

Purpose of the Study:

  • To assess the potential for a favorable interaction between amiloride and quinidine.

Main Methods:

  • Evaluated antiarrhythmic and electrophysiologic effects of quinidine alone and with amiloride in 10 patients with inducible sustained ventricular tachycardia.
  • Conducted parallel electrophysiologic studies in guinea pig papillary muscle.

Main Results:

  • Seven of 10 patients experienced adverse responses to the combination therapy, including induced ventricular tachycardia and somatic side effects.
  • Combination therapy significantly prolonged surface QRS duration compared to quinidine monotherapy.

Related Experiment Videos

  • In vitro studies showed amiloride and quinidine synergistically decreased Vmax due to increased sodium channel blockade.

    • Conclusions:

    • Amiloride potentiates quinidine's effects on QRS duration and Vmax.
    • The proarrhythmic potential of the amiloride-quinidine combination may stem from synergistic sodium channel blockade.