in contrast , both acute surgical sympathectomy ( cervical trunk division ) and alpha-receptor blockade ( 1.5 mg/kg of phenoxybenzamine ) enhanced the maintenance of cerebral blood flow in the face of hemorrhagic hypotension in that cerebral blood flow did not decrease until mean arterial blood pressure was approximately 35 % of the base-line value .
C0031441
phenoxybenzamine
C0020649
hypotension