Table 2.

Grey matter CVR differences in the MCA territory between patients with and without an intact CoW

	Non-intervened hemisphere		Intervened hemisphere
	Pre-revascularisation	Post-revascularisation	Pre-revascularisation	Post-revascularisation
Intact CoW	0.131±0.044	0.197±0.041	0.024±0.016	0.147±0.005
No ACoA+PCoA	0.117±0.05	0.171±0.037	0.057±0.026	0.145±0.019

All values in per cent MR signal change/mm Hg, mean±SE.

No significant differences were seen between those with and without an intact CoW.

ACoA, anterior communicating artery; CoW, circle of Willis; CVR, cerebrovascular reactivity; MCA, middle cerebral artery; PCoA, posterior communicating artery.