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Basilar artery diameter (mean ± SD) before SAH (baseline) and after SAH for animals with mild and moderate-severe VSPdelayed. In the mild VSPdelayed group, arterial diameter was significantly less than baseline on days 2 and 4 (number sign, P < .01 compared with baseline). In the moderate-severe VSPdelayed group, arterial diameter was significantly less than baseline 2, 4, and 7 days after SAH (asterisk, P < .01 compared with baseline).
