KEITH1 reported that patent ductus arteriosus (PDA) was responsible for cardiac failure in 10% of the diagnosed instances in the first week of life. Diagnosis of this lesion may be quite difficult in the neonate since classical auscultatory and other physical findings may be absent. In patients with PDA, an electrocardiographic evaluation might be helpful if it characterized the size of the left-to-right shunt or the pulmonary artery pressure. Elevated pulmonary vascular resistance in infants with respiratory distress syndrome (RDS) is characterized by tall R waves over the right precordium and low pulmonary vascular resistance is characterized by a deep S wave over the right precordium.2 This evidence suggests that even in the newborn period, a large left-to-right shunt without pulmonary arterial hypertension produces ECG evidence of left ventricular hypertrophy. The purpose of this study was to determine if these ECG findings of high resistance in the pulmonary
Marcano B, Goldberg SJ. Patent Ductus Arteriosus: A Correlation of Electrocardiographic and Physiologic Information. Am J Dis Child. 1969;117(2):194–197. doi:10.1001/archpedi.1969.02100030196013
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