Journal
HEART
Volume 92, Issue -, Pages 1-5Publisher
B M J PUBLISHING GROUP
DOI: 10.1136/hrt.2005.078782
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Late sodium current in cardiac cells is very small compared with the fast component, but as it flows throughout the action potential it may make a substantial contribution to sodium loading during each cardiac cycle. Late sodium current may contribute to triggering arrhythmia in two ways: by causing repolarisation failure (early afterdepolarisations); and by triggering late afterdepolarisations attributable to calcium oscillations in sodium - calcium overload conditions. Reduction of late sodium current would therefore be expected to have therapeutic benefits, particularly in disease states such as ischaemia in which sodium - calcium overload is a major feature.
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