Figure 16 m

A patient with atrial fibrillation and the WI pacemaker with lower rate of 70 pulses per minute (857 ms) and hysteresis rate of 50 beats output. This tracing (two leads recorded simultaneously) represents normal lower rate of 70 pulses per minute (857 ms) and hysteresis rate of 50 beats per minute (1200 ms). The square pulses in the bottom line represent pacing output. This tracing (two leads recorded simultaneously) represents normal hysteresis function. See the text for discussion.

Mitrani,R.D. and others,Cardiac Pacemakers,Hurst's The Heart,10th edition,Vol.1,pp.963-992