AVNRT occurs when a reentrant circuit is present ... the action potential will conduct through the fast AV nodal pathway with the shorter refractory period instead. After this action potential ...

This response can help differentiate between fast-slow AVNRT and atrial tachycardia. The findings indicated that certain measurements related to this response could serve as diagnostic indicators ...

This is a narrow-complex QRS rhythm which is quite fast. Looking closely ... circuit will be created. See the ECG strip below which shows a PVC initiating AVNRT: ...