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CEREBRAL ARTERIAL AND VENOUS FLOW‐VELOCITY MEASUREMENTS IN POST‐HAEMORRHAGIC VENTRICULAR DILATATION AND HYDROCEPHALUS

Simultaneous anterior cerebral artery (ACA) and internal cerebral vein (ICV) flow‐velocities were measured in 18 babies with post‐haemorrhagic ventricular dilatation (PHVD) and hydrocephalus (PHH). Compared with a control group matched for post‐conceptional age, the resistance index of the ACA was increased. This was shown to occur at an early stage of PHVD in a longitudinal study of seven of the babies. There were no significant changes in ACA or ICV time‐averaged velocities. Eight babies with PHH had ventricular taps on 18 occasions to relieve raised intracranial pressure. There was a significant decrease in the resistance index of the ACA, accompanied by an increase in the ACA time‐averaged velocity, but no change in the ICV time‐averaged velocity.