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AV Reentry Tachycardia AV Rentrant Tachycardia (Example) AV reentrant tachycardia (AVRT) occurs when a reentrant circuit occurs outside of the AV node through an abnormal conduction pathway that connects the atrium to the ventricles. This pathway is termed an "accessory pathway" or a "bypass tract". The presence of this congenitally abnormal pathway is called Wolf-Parkinson-White syndrome (WPW). If an action potential is able to traverse the accessory pathway and then return retrograde through the AV node (or vise versa), a reentrant circuit can be created resulting in AVRT. Findings on ECG include: 1) A narrow complex tachycardia 2) Variable findings depending on the direction of the circuit and the location of the accessory conduction pathway (See WPW section). |
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