Figure 3
From: Relationship between anthropometric measures and early electrocardiographic changes in obese rats
Normal human and rat ECGs showing the waves and time intervals. The rat ECG compared to the human ECG has both positive and negative deflections. These deflections, just like in humans, are as a result of action potentials in the myocardial cells. The positive deflections include the P, R and T waves. The negative deflections include the Q and S waves. The difference from the human ECG is the lack of an ST segment.