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.