Correlation Between Cerebral Circulation and
Intellectual lmpairment in Patients With "Aging Brain" and the Effect of Vinpocetine on Cerebral Circulation
Manabu Miyazaki
Department of Internal Medicine,
Bell-land Hospital, Sakai City, Osaka, Japan
Drug Develop Res 1988; 14: 199-204
Abstract
The Doppler ultrasonic technique is useful for the examination of cerebral circulation as well as for the evaluation of cerebral circulation-improving drugs. This study deals with a correlation of cerebral circulation with
intellectual impairment in subjects with aging brain syndrome and with measuring the effect of
vinpocetine on cerebral circulation, using the Doppler technique.
The correlation between cerebral circulation and intellectual impairment was first studied in 48 patients with aging brain and intellectual impairment. As a parameter for cerebral circulation, the Continuous
Index (CI), as calculated from the blood flow pattern recorded at the internal carotid artery, was used together with Hasegawa's Dementia Scale (HDS) for intellectual
impairment.
Second, blood flow change of the internal carotid and vertebral artery was measured after a single oral dose of 5 mg
vinpocetine and after
multiple oral doses of 5 mg vinpocetine three times daily for 7 days in six patients with aging brain.
The mean correlation coefficient (r) between CI and HDS was 0.391 (P < 0.01) in 48 patients. It was 0.612 (Fl < 0.01) in 27 patients with moderate to severe
intellectual impairment, 0.735 (P < 0.01) in 14 patients with vascular type impairment, and 0.443 (not significant) in 10 patients with the Alzheimer type. The results suggest some correlation between cerebral circulation and
intellectual impairment in the aging brain, especially in patients with the vascular type.
An increase of blood flow was recognizable after a single oral dose of 5 mg
vinpocetine.