EKG: Narrow Complex Tachycardia in a neonate

Newborn transferred from another facility.
Intractable tachycardia, now on Amiodarone, Procainamide and Digoxin.
Plan is to change Digoxin to Beta-blocker.
Panel 1 (below) - Telemetry print-out of tachycardia breaking to WPW pattern (*)
Panel 2 (above): WPW pattern changing to Normal AV conduction (*)

Panel 3 (above): 12-lead EKG during tachycardia