What question did this study set out to answer?

The study aims to explore how acute ventricular dilatation affects the electrophysiologic characteristics of d,l-sotalol and flecainide.

April 1, 1998Journal of Cardiovascular Electrophysiology

Divergent Effect of Acute Ventricular Dilatation on the Electrophysiologic Characteristics of d,I‐Sotalol and Flecainide in the Isolated Rebbit heart

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Why the study?

Does acute ventricular dilatation alter the electrophysiologic effects of d,l-sotalol and flecainide in an isolated rabbit heart model?

Population

Isolated rabbit heart model of acute ventricular dilatation (AVD)

Comparison

d,l-sotalol and flecainide during acute… vs Control group with the same extent of acute…

Design

Preclinical

Authors

LELars EckardtElectrophysiology WHWilhelm HaverkampElectrophysiology UGULRICH GOTTKER

Discussion

Member takes

Implication

May inform flecainide caution in ventricular dysfunction; leaves open translation from this rabbit model.

Key Points

The study aims to explore how acute ventricular dilatation affects the electrophysiologic characteristics of d,l-sotalol and flecainide.
Utilized isolated rabbit heart model to simulate acute ventricular dilatation.
Modified ventricular size through rapid fluid volume changes.
Pacing was performed with monophasic action potential catheters at varying cycle lengths.
d,l-sotalol led to a 13.5% increase in refractoriness and a 15.5% increase in QT interval (P < 0.05).
Flecainide showed a 47.6% increase in pacing thresholds and a 48.8% increase in QRS duration, both with significant rate-dependence.
During acute ventricular dilatation, d,l-sotalol's effect was relatively preserved, while flecainide's slowing effect was exacerbated.

Structured PICO

Does acute ventricular dilatation alter the electrophysiologic effects of d,l-sotalol and flecainide in an isolated rabbit heart model?

Population

Isolated rabbit heart model of acute ventricular dilatation (AVD)

Intervention

d,l-sotalol (10 microM) and flecainide (2 microM) during acute ventricular dilatation

Comparator

Control group with the same extent of acute ventricular dilatation

Outcome

Electrophysiologic properties including refractoriness, monophasic action potential (MAP) duration, QT interval, pacing thresholds, QRS duration, and conduction timesurrogate

Acute ventricular dilatation preserves the repolarization-prolonging effects of sotalol but exaggerates the conduction-slowing effects of flecainide, potentially explaining flecainide-related proarrhythmia in ventricular dysfunction.

Cite This Study

Eckardt et al. (1998) studied this question.

synapsesocial.com/papers/6a209138de5eb88fb83024d4 https://doi.org/10.1111/j.1540-8167.1998.tb00925.x

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Divergent Effect of Acute Ventricular Dilatation on the Electrophysiologic Characteristics of d,I‐Sotalol and Flecainide in the Isolated Rebbit heart

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Divergent Effect of Acute Ventricular Dilatation on the Electrophysiologic Characteristics of d,I‐Sotalol and Flecainide in the Isolated Rebbit heart

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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