Is this narrow complex narrow complex tachycardia with short RP interval likely to be AVRT or AVNRT?

 

 

 

 

We can see a retrograde P wave well away from the QRS, in the ST segment. This is more likely to be AVRT. In AVNRT, P is either not seen as it is buried in the QRS or it is seen at the end of the QRS causing a pseudo R’ or S.