Electrophysiological Defects
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Wolff-Parkinson-White What Are They?

In those cases where the electrical impulse does not travel along the normal pathway or at the normal rate or rhythm, the pumping of the heart is disrupted.

An example (diagram at left) is known as the Wolfe-Parkinson-White Accessory Connection. In this defect, the electrical impulse enters the right ventricle in two places rather than one, causing the ventricular contractions to be out of synch.

Electrophysiological defects that affect the heart include various forms of arrhythmia, or abnormal rates or rhythms of the beating of the heart. Examples include Tachycardia (the heart beats faster than normal), and Fibrillation (the rapid, chaotic beating of individual heart muscle fibers). Flutter, another form of arrhythmia, is a less severe form of fibrillation.