The PVC conducts back to the atrium though the slow AV nodal pathway and then results in conduction back down the AV node to create the narrow-complex "echo beat". The P wave preceding the echo ...

The following is a summary of “Predicting factors for unresolved premature ventricular complexes in healthy children,” ...

Looking closely at the last part of the QRS complex in leads V1 and V2, P waves can be seen ... will be created. See the ECG strip below which shows a PVC initiating AVNRT: ...