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afterdepolarization |
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afterdepolarization /af·ter·de·po·lar·iza·tion/ (af″ter-de-po″lar-ĭ-za´shun) a depolarizing afterpotential, frequently one of a series, sometimes occurring in tissues not normally excitable. It may occur before (early a.) or after (delayed a.) full repolarization. afterdepolarization [-dēpō′lərizā′shən] a membrane potential depolarization that follows an action potential. In cardiac muscles, it may be early (during phases 2 and 3 of the action potential) or delayed (during phase 4), and it is thought to cause atrial and ventricular tachycardia, especially in the setting of a long Q-T interval or digitalis poisoning. Also called afterpotential. afterdepolarization in myocardial activity a polarization, sufficient to trigger a cardiac cycle, which results from a preceding impulse or series of impulses. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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