Supraventricular tachycardia due to Reentry

Posted by e-Medical PPT Thursday, May 23, 2013
This accounts about 80-90% of all sustained SVT in the general population .Reentrant SVT results from abnormal propagation of electrical impulse becz of presence of two separate pathways with different electrophysiological properties ,
There are four type of SVT from reentry .

1-atrioventricular nodal reentrant tachycardia (AVNRT)
2- Atrioventricular reciprocating ( or reentrant ) tachycardia ( AVRT)
3- sinoatrial reentrant tachycardica ( SART)
4- intra-atrial tachycardia ( IART) .

Atrioventricular nodal reentrant tachycardia
The most common SVT , young and healthy without structural heart , twice more in women than men .
AVNRT is type of reentrant SVT with two separate pathways , these two pathways have different EP properties and are both location within or around AV node.
- Slow pathway
-  Fast pathway 

ECG findings
Narrow QRS tachycardia with regular R-R interval
And no visible Pwave
In 2,3,avf the P wave are inerted but not visible in ECG because the atria and ventricle is activated simultaneously this is in 66% OF CASES .
Its not perfectly synchronous , if the retrograde P wave occurs immediately after the QRS complex . The Pseudo-Q , pseudo-S , and pseudo-r’ wave should resolve on conversion of the tachycardia to normal sinus rhythm .

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