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• W1480476611 abstract "Computer modelling has emerged as a particularly useful tool in understanding the physiology and pathophysiology of cardiac tissues. Models of ventricular, atrial and nodal tissue have evolved and include detailed ion channel kinetics and intercellular Ca(2+) handling. Purkinje fibre cells play a central role in the electrophysiology of the heart and in the genesis of cardiac arrhythmias. In this study, a new computational model has been constructed that incorporates the major membrane currents that have been isolated in recent experiments using Purkinje fibre cells. The model, which integrates mathematical models of human ion channels based on detailed biophysical studies of their kinetic and voltage-dependent properties, recapitulates distinct electrophysiological characteristics unique to Purkinje fibre cells compared to neighbouring ventricular myocytes. These characteristics include automaticity, hyperpolarized voltage range of the action potential plateau potential, and prolonged action potential duration. Simulations of selective ion channel blockade reproduce responses to pharmacological challenges characteristic of isolated Purkinje fibres in vitro, and importantly, the model predicts that Purkinje fibre cells are prone to severe arrhythmogenic activity in patients harbouring long QT syndrome 3 but much less so for other common forms of long QT. This new Purkinje cellular model can be a useful tool to study tissue-specific drug interactions and the effects of disease-related ion channel dysfunction on the cardiac conduction system." @default.
• W1480476611 created "2016-06-24" @default.
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• W1480476611 date "2010-07-15" @default.
• W1480476611 modified "2023-09-23" @default.
• W1480476611 title "A computational model of Purkinje fibre single cell electrophysiology: implications for the long QT syndrome" @default.
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• W1480476611 doi "https://doi.org/10.1113/jphysiol.2010.187328" @default.
• W1480476611 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2916994" @default.
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• W1480476611 hasPublicationYear "2010" @default.
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