Future easy and physiological cardiac pacing

Figure 4 Spontaneous and para-Hisian paced ECGs. A: Surface ECG (peripheral derivations and V1-V5) during complete AV block with narrow QRS (90 ms) (registration speed 25 mm/s); B: Surface ECG (peripheral derivations and V1-V5) during para-Hisian pacing: the QRS is larger respect to the native QRS (registration speed 25 mm/s); C: Passage from to the native QRS to the para-Hisian paced QRS: the electrical axis is exactly the same (registration speed 25 mm/s). DDD: Dual-chamber atrio-ventricular cardiac pacing.