Fig. 2From: Electrocardiogram: his bundle potentials can be recorded noninvasively beat by beat on surface electrocardiogramAccording to the micro-wavelets before QRS complex, PR interval is the summation of three intervals: PAs interval (the time interval from the initiation of the P wave to the first notch of the P wave), AHs interval (the time interval from the first notch of the P wave to the initiation of the second wavelet closed to the QRS complex) and HVs interval (the time interval from the initiation of the second wavelet closed to the QRS complex to the start of the QRS complex). PAs indicates that PA interval recorded on surface electrocardiogram; AHs indicates that AH interval recorded on surface electrocardiogram; HVs indicates that HV interval recorded on surface electrocardiogramBack to article page