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Related Experiment Videos

Multiple targets for flecainide action: implications for cardiac arrhythmogenesis.

Samantha C Salvage1,2, Karthik H Chandrasekharan2, Kamalan Jeevaratnam3,4

  • 1Department of Biochemistry, University of Cambridge, Cambridge, UK.

British Journal of Pharmacology
|April 4, 2017
PubMed
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Flecainide treats cardiac arrhythmias by blocking sodium channels, but can worsen them in conditions like Brugada syndrome. Its effects depend on interactions with sodium channels and calcium release, influencing action potential propagation and cardiac rhythm.

Area of Science:

  • Cardiovascular Pharmacology
  • Cardiac Electrophysiology
  • Molecular Cardiology

Background:

  • Flecainide is a Class Ic antiarrhythmic drug used for various tachyarrhythmias.
  • It exhibits both antiarrhythmic and proarrhythmic effects, particularly in myocardial infarction and Brugada syndrome.
  • These effects are linked to its actions on cardiac ion channels, specifically Nav1.5 sodium channels and RyR2 calcium channels.

Purpose of the Study:

  • To elucidate the complex mechanisms underlying flecainide's dual actions (antiarrhythmic and proarrhythmic).
  • To investigate the role of Nav1.5 channel states and RyR2-mediated calcium release in flecainide's effects.
  • To analyze flecainide's impact on action potential propagation and arrhythmogenesis in different cardiac conditions.

Main Methods:

Related Experiment Videos

  • Utilized murine genetic models with modified Nav1.5 or RyR2 channel function.
  • Examined flecainide's interaction with Nav1.5 channels in open states, including trapping mechanisms.
  • Assessed flecainide's influence on sodium currents (INa, INaL), intracellular calcium levels ([Ca2+]i), and action potential (AP) propagation.

Main Results:

  • Flecainide acts as a use-dependent antagonist of Nav1.5 channels, with effects modulated by channel gating.
  • Proarrhythmic effects in Brugada syndrome are linked to Nav1.5 loss-of-function, exacerbated by flecainide.
  • Flecainide reduces proarrhythmic effects in LQTS3 (gain-of-function Nav1.5) and CPVT (aberrant RyR2 function), potentially via indirect calcium modulation.
  • Flecainide's impact on arrhythmogenesis is complex, depending on interactions with both Nav1.5 and RyR2 function.

Conclusions:

  • Flecainide's therapeutic and adverse effects stem from intricate interactions with Nav1.5 and RyR2 channels.
  • Understanding these molecular interactions is crucial for predicting flecainide's response in various cardiac arrhythmias.
  • Flecainide's modulation of ion channel function and intracellular calcium dynamics underlies its paradoxical effects on cardiac rhythm.