Experimental studies on the effect of Aligeron on the cerebral circulation

In acute experiments on cats under urethan anaesthesia and on dogs under chloralose-urethan narcosis the effect of the cinnarizine analogue Aligeron on local cortical cerebral blood flow (local CBF) and internal carotid blood flow was studied. The local CBF was recorded by means of a thermoclearance method using thermistor transducers. In addition the cortical pH and the arterial blood pressure were registered. For determination of internal carotid flow the flowmetric method was used accompanied by a simultaneous registering of heart rate and arterial blood pressure. Cinnarizine and papaverine were used as reference compounds. The results obtained show that Aligeron increases both the internal carotid flow (with 64% in a dose of 5 mg/kg) and the local CBF (with 30% in a dose of 1 mg/kg and 40% at 5 mg/kg). This effect is higher and longer-lasting than those of cinnarizine and papaverine.