Fig. 2.

Flow in the MCA is reduced as the severity of the ICA vasospasm increases; however, the effects are minimised by the presence of a complete CoW. Hypertension increases blood flow, but does not restore flow to 100% of baseline. CoW, circle of Willis; d, distributed spasm; f, focal spasm; Hype, hypertension; ICA, internal carotid artery; L, left vessel; MCA, middle cerebral artery.