cerebral and cerebellar blood flows measured by a hydrogen clearance method were evaluated under stepwise hemorrhagic hypotension before and 30 minutes after ligation and after a 30-minute recirculation period following 1 hour of ligation . alpha-adrenergic blockade with phenoxybenzamine , beta-adrenergic blockade with propranolol , and muscarinic cholinergic blockade with atropine were selectively administered before ligation for inhibition of sympathetic and parasympathetic tone .
C0020649
hypotension
C0033497
propranolol