The difficulty in hearing Korotkow sounds and in palpating the pulse in the newborn has led to the development of several alternative methods of determining systolic blood pressure. Woodbury1 and Haselhorst2 have obtained intra-arterial pressures through the umbilical artery. The flush method3,4 depends on the flush of the blanched limb as the end-point and gives values a little lower than actual systolic blood pressure. A number of methods for determining systolic pressure employ oscillometers of various types to detect arterial pulsation. Ashworth et al.5 used a second forearm cuff connected to xylol beads to indicate the onset of the pulse. Rice and Posener6 use a second forearm cuff to transmit pulsation to a diaphragm which deflects a light beam which may be photographed. Schaffer7 used impedance plethysmography to detect pulsation. Morse8 has reported a method which uses a small, sensitive microphone imbedded in
GOODMAN HG, CUMMING GR, RABER MB. Photocell Oscillometer for Measuring Systolic Pressure in Newborn: Normal Values and Clinical Application. Am J Dis Child. 1962;103(2):152–159. doi:10.1001/archpedi.1962.02080020158008
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