THE INDIRECT determination of the blood pressure in the newborn infant is the chief subject of this report. The methods discussed include ausculation, palpation, the flush method, and, finally and most important, a method using impedance plethysmography. The problem of the proper width of the cuff is analyzed in detail. Also noted are observations on the range and variation of the normal neonatal systolic pressure.
My interest in this subject arose from a desire to explain why an occasional normal newborn infant shows a pattern of left ventricular preponderance in both the electrocardiogram and vectocardiogram.1 Usually the neonatal record shows such a degree of right preponderance that one cannot diagnose an abnormal degree of right preponderance from a single tracing in the early weeks of life. Serial tracings during the first three months are necessary. Normally they show a decreasing degree of right preponderance; only if the degree appears