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Junctional escape beat
A junctional escape beat is a delayed heartbeat originating not from the atrium but from an ectopic focus somewhere in the AV junction. It occurs when the rate of depolarization of the sinoatrial node falls below the rate of the atrioventricular node. This dysrhythmia also may occur when the electrical impulses from the SA node fail to reach the AV node because of SA or AV block. It is a protective mechanism for the heart, to compensate for the SA node no longer handling the pacemaking activity, and is one of a series of backup sites that can take over pacemaker function when the SA node fails to do so.
==Etiology==
A junctional escape complex is a normal response that may result from excessive vagal tone on the SA node, a pathological slowing of the SA discharge, or a complete AV block.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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