Abstract | BACKGROUND: METHODS AND RESULTS: In 12 female rabbits, HF was induced with the use of 4 weeks of rapid ventricular pacing. Twelve rabbits were sham operated. Isolated hearts demonstrated a significant prolongation of myocardial repolarization after induction of HF. Vernakalant caused a concentration-dependent (10 μmol/L and 30 μmol/L) increase of action potential duration (APD90) and QT interval without affecting spatial and temporal dispersion of repolarization. The increase in APD90 was accompanied by a greater increase in refractory period resulting in a significant increase in post-repolarization refractoriness. In control conditions, programmed ventricular stimulation and burst pacing led to ventricular fibrillation (VF) in 2 of the 12 sham (4 episodes) and in 3 of the 12 HF (24 episodes) subjects. In the presence of 30 μmol/L vernakalant, VF was no longer inducible in both groups (0 episodes). In the presence of low K+ concentration, neither sham nor HF vernakalant-treated subjects developed early after-depolarizations or ventricular tachyarrhythmias. CONCLUSION: In the present study, application of vernakalant led to a significant prolongation of myocardial repolarization and increased post-repolarization refractoriness but did not induce early after-depolarization and therefore did not cause proarrhythmia in failing hearts.
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Authors | Gerrit Frommeyer, Jochen Schulze Grotthoff, Christina Fischer, Harilaos Bogossian, Florian Reinke, Simon Kochhäuser, Dirk G Dechering, Michael Fehr, Peter Milberg, Lars Eckardt |
Journal | Journal of cardiac failure
(J Card Fail)
Vol. 20
Issue 10
Pg. 786-792
(Oct 2014)
ISSN: 1532-8414 [Electronic] United States |
PMID | 25084217
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | Copyright © 2014 Elsevier Inc. All rights reserved. |
Chemical References |
- Anisoles
- Anti-Arrhythmia Agents
- Pyrrolidines
- vernakalant
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Topics |
- Animals
- Anisoles
(pharmacology)
- Anti-Arrhythmia Agents
(pharmacology)
- Atrial Fibrillation
(diagnosis, drug therapy, etiology)
- Cardiac Resynchronization Therapy
(adverse effects)
- Disease Models, Animal
- Electrocardiography
- Female
- Heart Conduction System
(drug effects)
- Heart Failure
(etiology, physiopathology)
- Heart Ventricles
(pathology, physiopathology)
- Models, Cardiovascular
- Pyrrolidines
(pharmacology)
- Rabbits
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