three independent interventions have been shown to prevent the initiation of ventricular fibrillation after acute coronary artery occlusion in the psychologically stressed pig : 1 ) learned behavioral adaptation to the stressor , 2 ) cryogenic blockade of the frontocortical-brainstem pathway , and 3 ) intracerebral ( but not intravenous ) injection of a beta-receptor blocking agent ( levo-propranolol ) .
C0042510
ventricular fibrillation
C0033497
propranolol