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arrhythmias

what is extra systole and how tachycardia occurs in extra systole?
1807132_tn?1318747197
An extra systole is an extra heart beat either arising from the Atria (pac) or ventricles (pvc).  The disruption of the extra beat in the normal beat cycle can trigger a tachycardia event especially in cases of avnrt which is an extra pathway (muscle fiber) leading into the avnode that causes the signal to get stuck in a loop.  Most of the time it is a pac that will trigger an svt (supraventricular tahcycardia) event but for some people like myself it was a pvc that would trigger my avnrt.  
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