Capsular warning syndrome preceding pontine infarction.

groups after the induction of either hemodilution or hypoxic hypoxia. Although it would be inappropriate to interpolate results obtained under normal conditions to those that may be applicable under ischemic conditions, we must agree that the magnitude of hypoxic insult caused by hemodilution or hypoxia may be different between the two groups. However, this does not imply that the blood flow augmentation recorded in the hemodilution group was caused by hypoxic stimulation. If this were true, blood flow in the hypoxic hypoxia group should have increased after the induction of hypoxia. On the contrary, we observed a decrease in blood flow after the induction of hypoxic hypoxia. Therefore, it seems quite appropriate to speculate that the blood flow augmentation observed only in the hemodilution group was caused by a mechanism other than hypoxia.