1 4.1 Introduction
The cardiac electrical impulse is initiated in the sinoatrial node and spreads rapidly over the atria, slowly through the atrioventricular node, and rapidly over the specific ventricular conduction system and myocardium of both ventricles. These excitable tissues are able to generate an action potential in response to a suprathreshold current stimulus. The voltage difference between excited and resting tissue drives local current circuits that excite the resting tissue thereby causing spread of excitation in a wave-like manner. The main factors that determine propagation are (1) the properties of the ionic channels in the cell membrane, (2) the passive electrical properties of the tissue, and (3) in two- or three-dimensional media the curvature of the excitation wave. In atrial and ventricular myocardium, and in the specific ventricular conduction system, the current responsible for the action potential upstroke and for delivering local current for propagation is...
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Janse, M.J. (2010). Activation of the Heart. In: Macfarlane, P.W., van Oosterom, A., Pahlm, O., Kligfield, P., Janse, M., Camm, J. (eds) Comprehensive Electrocardiology. Springer, London. https://doi.org/10.1007/978-1-84882-046-3_4
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