Figure 5. Time evolution of ΔAPD_LV-RV due to LV/RV differences in APD adaptation, after a sustained (solid) or a gradual (dashed) change in pacing rate (750 to 400 ms). A:

Transient patterns of small ΔAPD_LV-RV develop under average conditions of slow APD adaptation. B: Conditions of protracted slow APD adaptation increase maximum amplitude and time window of the transient ΔAPD_LV-RV pattern. C: Conditions of larger ΔAPD_LV-RV at normal rate translate into a vertical shift of the transient pattern. Insets show LV/RV APD adaptation in each of the cases, for both stimulation protocols.