Related Experiment Videos
[Experimental models of torsades de pointes]
J M Davy1, J Weissenburger, F Chezalviel
1Laboratoire de pharmacologie, CHU Saint-Antoine, Paris.
Archives Des Maladies Du Coeur Et Des Vaisseaux
|December 1, 1992
Summary
Experimental models for torsades de pointes (a type of irregular heart rhythm) have advanced our understanding. These models clarify the roles of early afterdepolarizations and reentry in arrhythmia initiation and progression.
Area of Science:
- Cardiology
- Pharmacology
- Electrophysiology
Context:
- Torsades de pointes (TdP) is a life-threatening ventricular arrhythmia.
- Existing experimental models for TdP have limitations.
- Understanding TdP mechanisms is crucial for drug safety.
Purpose:
- To review and classify existing experimental models of TdP.
- To highlight advancements in understanding TdP electrophysiology and pharmacology.
- To assess the utility of these models for evaluating drug-induced arrhythmogenic risk.
Summary:
- Experimental TdP models fall into two categories: morphological (ECG simulation) and pharmacological (inducing early afterdepolarizations).
- Pharmacological models utilize agents like cesium chloride or new drugs.
- These models have elucidated the roles of early afterdepolarizations in TdP initiation and reentry in subsequent beats.
Impact:
- Improved understanding of TdP electrophysiologic mechanisms.
- Recognition of the interplay between early afterdepolarizations and reentry.
- Potential for more accurate assessment of drug-induced arrhythmogenic risk.