generally for AVNRT there is no precipitating factor, but in some cases stress
or alcohol leads to AVNRT.
diffrance between sinus
tacy and AVNRT -
1) in AVNRT heart rate
will be classical 150, in sinus tacy it will be high but varying
2) in AVNRT ABRUPTLY increase or decrease of heart rate , in sinus tacy it will increase or decrease slowly.
3)in AVNRT, R'. This is a small secondary R wave. It resembles a right bundle branch block
4) in AVNRT , Onset after a premature atrial beat with delayed conduction to the ventricles.