Dantrolene suppresses ventricular ectopy and arrhythmogenicity with acute myocardial infarction in a Langendorff-perfused pacing-induced heart failure rabbit model

Chung Chuan Chou*, Ming Shien Wen, Hui Ling Lee, Po Cheng Chang, Hung Ta Wo, San Jou Yeh, Delon Wu

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

14 Scopus citations

Abstract

Dantrolene in Failing Hearts with AMI Introduction Dantrolene prevents arrhythmogenic Ca2+ release during heart failure (HF). However, direct evidence to support its antiarrhythmic effects in failing hearts with acute myocardial infarction (AMI) is lacking. Methods and Results HF was induced by right ventricular pacing (312 beats/min, 4 weeks) in 19 rabbits. AMI was induced by coronary artery ligation in rabbits surviving chronic pacing (n = 17). The hearts were quickly excised and Langendorff-perfused for simultaneous membrane potential and intracellular Ca2+ (Cai) optical mapping when ventricular fibrillation (VF) occurred or 4 hours after AMI. The VF inducibility was defined as the ability to provoke sustained VF (>2 minutes) by pacing. Dantrolene (10 μM) was administered after baseline studies. Spontaneous VF occurred in 5 rabbits (SVF group). The ventricular premature beat (VPB) burden was significantly higher in the SVF group than the non-SVF group (P < 0.05). Dantrolene suppressed VPB burden (P = 0.03) and prolonged action potential duration (APD; P < 0.05) to reduce VF inducibility (P < 0.05). However, dantrolene shortened immediate postshock APD50 even if VF storm was suppressed. Conclusion In failing hearts with AMI, VPB burden plays a pivotal role in SVF occurrence. Dantrolene suppresses VPBs and/or prolongs repolarization to inhibit spontaneous VF and reduce VF inducibility.

Original languageEnglish
Pages (from-to)431-439
Number of pages9
JournalJournal of Cardiovascular Electrophysiology
Volume25
Issue number4
DOIs
StatePublished - 04 2014

Keywords

  • calcium
  • dantrolene
  • heart failure
  • myocardial infarction
  • optical mapping
  • pharmacology
  • ventricular fibrillation

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