Pediatric Electrocardiography by Ra-id Abdulla William Bonney Omar Khalid & Sawsan Awad

Author:Ra-id Abdulla, William Bonney, Omar Khalid & Sawsan Awad
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Paroxysmal SVT: Atrioventricular Nodal Reentrant Tachycardia (AVNRT)

AVNRT is a reentrant arrhythmia that circles within the AV node or peri-AV nodal tissue. This arrhythmia is thought to occur when there are two extensions on the AV node (often referred to as “dual AV node pathways” or “dual AV node physiology”). The two AV nodal extensions generally have distinct conduction velocities and are referred to as the “fast pathway” and “slow pathway.” The reentrant loop usually travels down the slow pathway and then turns up the fast pathway to complete the loop. The electrical signal branches off to the ventricle at the same time that the retrograde fast pathway is activated. Since the atrium and ventricle are activated simultaneously, the P waves and QRS complexes overlap. Thus, the retrograde P waves are inverted and buried within or “married” to the back of the preceding QRS complex with no separation between the two.

PSVT recognition clues:Classically presents as palpitations that start and stop abruptly.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.