THE FIRST part of this report deals with the unipolar electrocardiographic findings in 2 infants with right ventricular preponderance and 2 infants with left preponderance. The second part describes a unipolar pattern of endocardial injury in an infant.
Unipolar electrocardiography in the infant differs somewhat from that in the adult.1 If the heart is normally placed and not more than moderately enlarged, I have found that leads V6R and/or V4R represent the right side of the QRS complex whereas lead aVL represents the left side.2 Vsternum, which lies between leads V1 and V2 and which resembles them both, is of no value in defining the QRS pattern. In both normal and pathologic states it usually consists of a large biphasic curve. However, for the routine evaluation of the P wave it is the best lead.
Lead V6 is also of little