Table 1

Theoretically possible measurements and the most probable consequences for vessel diameter, provided the mean arterial blood pressure and end tidal carbon dioxide concentration remain unchanged

MeasurementVessel diameterInterpretation
Cerebral blood-flow velocityCerebral oxygen saturationMiddle cerebral arteryArteriolar
↑↓↓↔Vasospasm increase
↑↑↔↑Arteriolar dilatation
↓↑↑↔Vasospasm decrease
↓↓↔↓Arteriolar constriction