The chest leads from the same patient are shown here. The tracing on the left was recorded with the leads placed normally on the left side of the chest. Note that the R wave becomes progressively smaller from leads V1 to V6. The tracing on the right was recorded with the chest leads placed in the same relative positions, but on the right side of the chest. This restores the normal relationship between the heart and the chest leads and the ECG now appears normal.