Ventricular Refractory Period

The ventricular sense or pace refractory period is triggered after a sensed or paced ventricular event (Vs or Vp).

• the duration of the sense refractory period is 100 ms (non programmable)
• the duration of the pace refractory period is 150 ms (non programmable)

Ventricular Blanking after atrial pacing

The ventricular blanking is triggered after each atrial pulse (Ap).

• the post-atrial pacing ventricular blanking is non programmable (30 ms)

Ventricular safety window

The safety window follows ventricular blanking and lasts 95 ms minus the programmed length of the ventricular blanking.

• in DDD mode, when a ventricular signal is sensed, a ventricular pulse is emitted at the end of the safety window
• in SafeR mode, when a ventricular signal is sensed, no ventricular pulse is emitted at the end of the safety window