Electrocardiographic Studies in the Healthy Newborn

Abstract

Summary An electrocardiographic study was performed on 56 healthy children during their first week of life. Recordings were made repeatedly on every child using a long recording time. Leads I, II, III, aVR, aVL, aVF, VI, V2, V3, V4, V5, V6 were recorded. Extreme fluctuations of the heart rate, a high frequency of sinus arrhythmia and supraventricular arrhythmia, signs of right ventricular hypertrophy, extremely low T waves with significant T wave changes during the first week and in some cases prolonged Q‐T intervals were observed. My thanks are due to Å. Gyllensward, M. D., for advice and criticism.