[Narcosis, platelet aggregation and arousing drugs].

During pentobarbital (25 mg/kg i.v. in 2 min), pentothal (15 mg/kg i.v. in 2 min) and ketamine (10 mg/kg i.v. in 2 min) narcosis, rabbits showed reduced platelet reactivity ot the direct aggregating effect of ADP (2 X 10(-5) M) and the indirect effect of thrombin (0.1 U/ml). Certain arousal drugs, specifically those of metabolic type such as SAMe (20 mg/kg i.v. in 2 min) and Thiola (166 mg/kg i.v. in 2 min) and of haemodynamic type such as nicergoline (6.66 mg/kg i.v. in 2 min) and hexobendine (5 mg/kg i.v. in 2 min) administered 31 min after narcosis induction, impede the depression brought on by narcosis on on platelet reactivity.