Figure 2: An ECG obtained from a beagle dog 21 days later, showing six rhythm strips simultaneously (leads I, II, III, aVR, aVL and aVF). VPCs are the most frequent type of abnormal rhythm in dogs ...

The PR segment is the portion of the ECG from the end of the P wave to the ... PR segment elevation occurs in lead aVR in the setting of pericarditis.