Figure4 Demonstrations of the special function, A pace on PVC of
the pacemaker.
When PVC occurs, 480-ms PVARP happens thereafter during which the
absolute refractory period is 150ms and the relative refractory period
is 330ms. If the P wave occurs during the relative refractory period,
the P wave is called retrograde P wave and AP will be released at 330ms
after the retrograde P wave.
Figure 5. ECG of the patient after turning off the special function of A
pace on PVC and taking medicine.