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Electrophysiological and hemodynamic effects of vernakalant and flecainide during cardiac resynchronization in dyssynchronous canine hearts


van Middendorp, Lars B; Strik, Marc; Houthuizen, Patrick; Kuiper, Marion; Maessen, Jos G; Auricchio, Angelo; Prinzen, Frits W (2014). Electrophysiological and hemodynamic effects of vernakalant and flecainide during cardiac resynchronization in dyssynchronous canine hearts. Journal of cardiovascular pharmacology, 63(1):25-32.

Abstract

INTRODUCTION: Patients with heart failure and left bundle branch block (LBBB) are frequently treated with biventricular pacing (BiVP). Approximately one-third of them suffer from atrial fibrillation. Pharmacological conversion of atrial fibrillation is performed with drugs that slow ventricular conduction, but the effects of these drugs on the benefit of BiVP are poorly understood.
METHODS: Experiments were performed in dogs with chronic LBBB, investigating the effects of Vernakalant and Flecainide (n = 6 each) on hemodynamics and electrophysiology during epicardial (EPI) and endocardial BiVP. The degree of dyssynchrony and conduction slowing was quantified using QRS width and EPI electrical mapping.
RESULTS: Compared with LBBB, EPI and endocardial BiVP reduced QRS duration by 7% ± 9% (P < 0.05 compared with LBBB) and 20% ± 13% (P < 0.05 compared with LBBB, P < 0.05 between modes), respectively. During BiVP, the administration of Vernakalant and Flecainide increased QRS duration by 20% ± 14% (P < 0.05 compared with predrug BiVP) and 34% ± 10% (P < 0.05 compared with predrug BiVP, P < 0.05 between drugs). left ventricular (LV) dP/dtmax decreased by 16% ± 8% (P < 0.05 compared with predrug BiVP) during Vernakalant and by 14% ± 15% (P < 0.05 compared with predrug BiVP) during Flecainide. The drugs did not affect the relative changes in QRS width and LV dP/dtmax induced by BiVP.
CONCLUSIONS: Vernakalant and Flecainide decrease contractility, slow myocardial conduction velocity, and increase activation time. The electrical and hemodynamic benefits of BiVP are not altered by the drugs.

Abstract

INTRODUCTION: Patients with heart failure and left bundle branch block (LBBB) are frequently treated with biventricular pacing (BiVP). Approximately one-third of them suffer from atrial fibrillation. Pharmacological conversion of atrial fibrillation is performed with drugs that slow ventricular conduction, but the effects of these drugs on the benefit of BiVP are poorly understood.
METHODS: Experiments were performed in dogs with chronic LBBB, investigating the effects of Vernakalant and Flecainide (n = 6 each) on hemodynamics and electrophysiology during epicardial (EPI) and endocardial BiVP. The degree of dyssynchrony and conduction slowing was quantified using QRS width and EPI electrical mapping.
RESULTS: Compared with LBBB, EPI and endocardial BiVP reduced QRS duration by 7% ± 9% (P < 0.05 compared with LBBB) and 20% ± 13% (P < 0.05 compared with LBBB, P < 0.05 between modes), respectively. During BiVP, the administration of Vernakalant and Flecainide increased QRS duration by 20% ± 14% (P < 0.05 compared with predrug BiVP) and 34% ± 10% (P < 0.05 compared with predrug BiVP, P < 0.05 between drugs). left ventricular (LV) dP/dtmax decreased by 16% ± 8% (P < 0.05 compared with predrug BiVP) during Vernakalant and by 14% ± 15% (P < 0.05 compared with predrug BiVP) during Flecainide. The drugs did not affect the relative changes in QRS width and LV dP/dtmax induced by BiVP.
CONCLUSIONS: Vernakalant and Flecainide decrease contractility, slow myocardial conduction velocity, and increase activation time. The electrical and hemodynamic benefits of BiVP are not altered by the drugs.

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Additional indexing

Item Type:Journal Article, refereed, further contribution
Communities & Collections:04 Faculty of Medicine > Cardiocentro Ticino
Dewey Decimal Classification:610 Medicine & health
Date:2014
Deposited On:24 Feb 2014 15:50
Last Modified:07 Dec 2017 08:38
Publisher:Lippincott, Williams & Wilkins
ISSN:0160-2446
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1097/FJC.0000000000000020
PubMed ID:24084224

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