Saturday, December 24, 2022

Hysteresis

In single chamber devices, for ventricular pacing, hysteresis allows a longer cycle length after a sensed event than after a paced beat. 

It helps maintain intrinsic rhythm and preserves battery. 

In summary: Hysteresis is a programmable feature that allows the pacemaker to begin ventricular pacing only if the spontaneous rate falls below a set rate (eg, 50 bpm); then pacing continues at the programmed base rate (60 bpm) unless intrinsic ventricular activity is sensed.

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