Future easy and physiological cardiac pacing

Figure 1 Spontaneous and Hisian paced ECGs. A: Surface electrocardiogram (ECG; peripheral derivations and V1-V5) and endocardial electrogram (EGM; His bundle site) during chronic atrial fibrillation: the QRS is narrow (90 ms) (registration speed 25 mm/s); B: His bundle registration: HV 56 ms (registration speed 50 mm/s); C: Spike-V during direct Hisian pacing equal to the basal HV (58 ms) (registration speed 100 mm/s); D: Surface ECG (peripheral derivations and V1-V5) and endocardial EGM (His bundle site) during direct Hisian pacing: the QRS is equal to the native QRS (registration speed 25 mm/s).