The chest (precordial) leads of three patients whose limb leads were shown on the previous pages (pages 2.3.28, 30 and 32) are shown here. Note that in each, there is a small R wave in V1, but that in each, the dominant wave form in V1 is negative. The transition from the negative QRS complexes seen in leads V1 and V2 to the positive QRS complexes in V5 and V6 occurs in the mid precordiaal leads (leads V3 and V4), but is somewhat variable.