[Cerebral blood flow velocities in the anterior cerebral arteries and basilar artery. II. Investigation in very low birth weight infants].
We studied the values of the Pourcelot's index of resistance in the anterior cerebral artery (RI-ACA) and basilar artery (RI-BA) in very low birth weight infants weighing less than 1,500 g at birth. At the time of measurements, their postconceptional ages were 32, 34, 36, 38, 40 and 42 weeks. The mean value of RI-ACA (0.744 +/- 0.026, +/- SD) was significantly lower than that of RI-BA (0.766 +/- 0.026) (p less than 0.001), and they were higher than those in normal term infants. However, the mean value of RI-ACA and RI-BA, averaged from the measurements of postconceptional ages at 38, 40 and 42 weeks, showed no significant difference from those of normal term infants. In contrast, the mean value of RI ratio (= RI-ACA/RI-BA) in very low birth weight infants showed no significant difference from that of normal term infants.
Department of Neonatology, Japanese Red Cross Medical Center, Tokyo.
S
S
Nishimaki
T
T
Kawakami
H
H
Akamatsu
Y
Y
Iwasaki
D000704:Analysis of Variance; D001488:Basilar Artery / Q000502:physiology*; D001783:Blood Flow Velocity; D002536:Cerebral Arteries / Q000502:physiology*; D006801:Humans; D007230:Infant, Low Birth Weight / Q000502:physiology*; D007231:Infant, Newborn