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About: Quatrefoil reentry     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : dbo:Disease, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: disease New Facet based on Instances of this Class

Quatrefoil reentry is a type of cardiac arrhythmia that consists of two adjacent figure-of-eight reentrant circuits. Quatrefoil reentry was predicted by bidomain simulations in 1991and observed experimentally in 1999.Quatrefoil reentry can be induced by stimulating the heart through a single electrode twice, with the second stimulus timed near the end of the refractory period of the first action potential. If the second stimulus is a cathode, the wave fronts propagate initially parallel to the myocardial fibers; if it is an anode, the wave fronts propagate initially perpendicular to the fibers. Quatrefoil reentry can be understood qualitatively using a simple cellular automaton.