Key Points
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Ventricular arrhythmias are the most common cause of sudden death, and individual risk prediction is a major medical challenge
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The His–Purkinje system constitutes a tiny fraction of the ventricular mass, but is specialized for rapid synchronous activation of both ventricles
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The pathogenic role of the Purkinje system is disproportionately high; discrete excitations act as main triggers of ventricular fibrillation in individuals with structurally normal hearts and in patients with diseased hearts
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Purkinje cells are known to have a unique electrophysiology involving complex intracellular Ca2+ cycling
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Further characterization of arrhythmia mechanisms is needed to enable the development of targeted therapy
Abstract
Ventricular arrhythmias are a major cause of sudden death, which accounts for approximately half of cardiac mortality. The His–Purkinje system is composed of specialized cells responsible for the synchronous activation of the ventricles. However, experimental studies show that the Purkinje system can be arrhythmogenic during electrolyte imbalance, after exposure to various drugs, and in myocardial ischaemia, during which Purkinje cells can survive in anaerobic conditions. Purkinje cells can generate both automatic and triggered focal rhythms, and their network configuration can accommodate re-entrant circuits. In humans, a variety of monomorphic ventricular tachycardias can be sustained within the architecture of the Purkinje branches. Furthermore, discrete Purkinje sources can serve as critical triggers of ventricular fibrillation in a wide spectrum of patients with structural heart disease or with an apparently normal heart. In drug-resistant cases of monomorphic and polymorphic Purkinje-related ventricular tachycardias, catheter ablation is a very effective treatment. The specific transcriptional signatures and functional properties of Purkinje cells, including their intracellular calcium dynamics, underlie their extreme arrhythmogenicity. However, the identification of vulnerable individuals remains challenging, and the molecular mechanisms of Purkinje-related arrhythmias have to be characterized further to enable the development of interventions to prevent lethal cardiac arrhythmias.
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M. Haissaguerre, E.V., B.S., M. Hocini, and O.B. researched data for the article. M. Haissaguerre, E.V., B.S., and O.B. wrote the article. M. Haissaguerre and O.B. reviewed and edited the manuscript before submission.
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Haissaguerre, M., Vigmond, E., Stuyvers, B. et al. Ventricular arrhythmias and the His–Purkinje system. Nat Rev Cardiol 13, 155–166 (2016). https://doi.org/10.1038/nrcardio.2015.193
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DOI: https://doi.org/10.1038/nrcardio.2015.193
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