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[Effect of 1-[(1-pyrrolidynylcarbonyl) methyl]-4-(3, 4, 5-trimethoxycinnamoyl)piperazine maleate (cinepazide) on cerebral and peripheral circulation in cats (author's transl)].

Effects of cinepazide, a vasoactive agent, on regional circulations in various sites of brain and other organs in curarized, artificially respirated cats were studied using a thermoelectrical method. The mechanism of the vascular effect was also investigated. Cinepazide produced a marked increase in blood flow in the cerebellar cortex and an apparent increase in blood flow in the cerebral cortex. Effects of the drug on blood flow in the thalamus, hypothalamus and amygdala were inconsistent. Cinepazide produced the most significant increase in myocardial blood flow and also an apparent increase in muscular blood flow, whereas the drug did not consistently alter hepatic blood flow, and decreased renal and dermal blood flow. Cinepazide produced a mild and sustained fall in blood pressure, however, a transient slight rise in blood pressure was noted when the drug was given into the vertebral artery. It seems possible that the action of cinepazide might involve a mild stimulation of beta adrenergic receptors and slight stimulation of alpha adrenergic receptors but not cholinergic receptors, in the cerebral and peripheral vascular systems. Increase in blood flow induced by cinepazide seems to be mainly due to the smooth muscle relaxant effect and may be mediated via a metabolic mechanism.