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Atrioventricular Nodal Reentrant Tachycardia (AVNRT) ECG

Atrioventricular Nodal Reentrant Tachycardia (AVNRT) ECG

The arrow denotes the pseudo-R' deflection at the end of the QRS complex in lead V1 that is actually the reentrant P-wave.

Image courtesy of L. Brent Mitchell, MD.