Fast and regular rhythm strip without P waves

This is simply called an SVT.

You can conceptualize the types by visualizing the area around the AV node.

Thus, the types are:

- AV node dependent

• AVNRT, this being a nodal reentry
  

• Accessory Pathway (aka AVRT/AV reciprocating tachycardia)

- AV node independent = Atrial tachycardia, this being either automatic or atrial reentry/AF/AFlutter

- Sinus tachycardia

• physiologic
• sinus node reentry/inappropriate sinus tachycardia

So, you can summarize it as Reentry, Accessory, Automatic, Physiologic, Flutter...like the 5 fingers.

If you're a betting man then you'd put your money on Nodal Reentry, followed by Accessory pathway.