Fig. 2. Effects of intrathecal normal saline (control; n = 7) and dexmedetomidine (DXM; n = 7) on reactivity of cerebral pial arterioles to hypoxia. Data are expressed as percentage change increase in diameter. DXM did not affect the arteriolar dilation induced by either level of hypoxia. Values are mean ± SD. NS = not significant between corresponding values. *P < 0.05 compared with corresponding values.