This study aims to evaluate serial changes in the amplitude of the QRS complex on electrocardiograms during the first week of life in healthy full-term infants.
Characterizes QRS amplitude trends in healthy neonates; leaves open whether deviations aid early cardiac screening.
Most studies of the electrocardiogram in healthy full-term infants have commented on the presence of right axis deviation, a tendency to right ventricular preponderance, and changes in amplitude and direction of precordial T waves (Krumbhaar and Jenks, 1917; Schaffer et al.,1950; Ziegler, 1951, 1956). Surprisingly few serial studies have been done, despite increased interest in the neonatal period and the importance of determining individual as well as group differences Recent investigations have demonstrated significant changes in electrocardiographic intervals during the first hour as well as the first week of life (Walsh, 1963a, c). It was therefore thought to be of interest to determine whether the amplitude of the QRS complex was similarly affected.
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S. Zoe Walsh (1963) studied this question.
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