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Intraventricular Conduction

1 byte added, 04:02, 18 January 2010
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===Phase 4 Aberration===
Phase 4 aberration only occurs after prolonged pause. During such a pause (e.g. in second degree AV block) the Purkinje fibers can 'hyper'-depolarize spontaneously. As their membrane potential becomes more and more negative , the conduction velocity decreases and can even be blocked altogether. This also requires an upward shift of the threshold membrane potential and a change in membrane responsiveness, so it is rarely seen in normal hearts.
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