|
KMID : 1011920110120010014
|
|
International Journal of Arrhythmia
2011 Volume.12 No. 1 p.14 ~ p.17
|
|
|
Mechanism of atrioventricular reentrant tachycardia
|
|
Choi In-Suck
|
|
|
Abstract
|
|
|
|
The circuit of atrioventricular reentrant tachycardias (AVRTs) includes the atria, AV node, His-Purkinje system, the ventricles, and an accessory pathway (AP). So an AV block cannot occur during AVRTs without terminating tachycardia. Accessory pathways conduct anterogradely and result in a delta wave on ECG (manifest AP) or are capable of conduction only in the retrograde direction (concealed AP). AVRTs are divided into orthodromic and antidromic varieties. In orthodromic AVRT, anterograde conduction occurs via the normal AV node and the His-Purkinje system (AVCS) and retrograde conduction is via AP. In antidromic AVRT, AV conduction is via AP and VA conduction is via the normal His-Purkinje and the AV nodal system (VACS). There are several variants of AVRTs. Permanent junctional reciprocating tachycardia (PJRT) is an incessant form of AVRT using AP which has decremental conduction property and is capable of retrograde conduction. In some AVRT, APs connect atria and right bundle branches (atriofascicular fibers). These fibers have decremental conduction properties and only conduct anterogradely. Some AVRTs use two accessory pathways, one for anterograde conduction and the other for retrograde conduction.
|
|
|
KEYWORD
|
|
|
tachycardia, paroxysmal, supraventricular, reciprocating, mechanism
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|
|
|