TY - JOUR T1 - Continuous wave Doppler ultrasound in evaluation of cerebral blood flow in neonates. JF - Archives of Disease in Childhood JO - Arch Dis Child SP - 677 LP - 681 DO - 10.1136/adc.58.9.677 VL - 58 IS - 9 AU - P H Gray AU - E A Griffin AU - J E Drumm AU - D E Fitzgerald AU - N M Duignan Y1 - 1983/09/01 UR - http://adc.bmj.com/content/58/9/677.abstract N2 - The cerebral circulation of 25 normal term infants was investigated using continuous wave Doppler ultrasound. Serial blood flow velocity signals were obtained from the common carotid and anterior cerebral arteries during the first week of life. The records were processed using a frequency spectrum analyser to provide cerebral blood velocity waveforms. The pulsatility index (PI), A/B ratio, and rise and fall slope of the waveforms were calculated. The results indicated that cerebrovascular resistance was raised appreciably on day 1 of life compared with later in the first week. In 18 of 25 infants (72%) there was no continuous carotid blood flow in the first hours of life. We suggest that the human cerebral circulation adapts to the process of birth in a similar fashion to that of animal models. ER -