Figure legends:
Fig 1: Short HV (26 ms) after ablation of the manifest atrioventricular AP. The small signal in front of the ventricular electrogram in His catheter was validated as ‘H’ during decremental atrial pacing in the last beat. The fixed HV on surface ECG confirmed a FVP.
Fig 2: Para-Hisian pacing showing the first 2 beats were Vc and last one was H+Vc. There is a paradoxical SA prolongation in the narrower last beat.
Fig 3: Another protocol of PHP revealed a pure Hc in the first beat. The CS catheter was out, hence no assessment of VA was made.