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Methods Find Exp Clin Pharmacol. 2000 Sep;22(7):585-94.

Double-blind, randomized, placebo-controlled pilot study with anapsos in senile dementia: effects on cognition, brain bioelectrical activity and cerebral hemodynamics.

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  • 1EuroEspes Biomedical Research Center, A Coruña, Spain.


The aim of this study was to evaluate the effects of two doses of anapsos in comparison with placebo on cognitive performance, brain bioelectrical activity pattern and cerebral hemodynamic parameters in patients with mild to moderate senile dementia of vascular type and Alzheimer type. Forty-five patients (age 73.8 +/- 7.6 years; range 56-89 years) with mild to moderate senile dementia (Global Deterioration Scale: stages 3-5) of the vascular (VD; n = 22) or the Alzheimer type (AD; n = 23) were included in a double-blind randomized placebo-controlled clinical trial. After a 2-week period of drug washout, patients were treated with placebo (n = 15; age 72.7 +/- 7.5 years), 360 mg/day of anapsos (n = 15; age 75.5 +/- 7.2 years), or 720 mg/day of anapsos (n = 15; age 73 +/- 7.7 years) for 4 weeks (28 days). At baseline and after the 4-week period of double-blind treatment, cognitive performance, brain bioelectrical activity power and blood flow hemodynamics in the middle cerebral arteries were evaluated with ADAScog, brain mapping and transcranial Doppler ultrasonography, respectively. Patients receiving 360 mg/day of anapsos showed a significant improvement in cognitive performance after treatment (ADAScog scores: p < 0.05) that was not observed in patients treated with placebo or 720 mg/day of anapsos. As compared to placebo, anapsos (360 mg/day) induced a significant improvement in ADAScog scores in mild senile dementia patients (p < 0.01) and in the subset of patients with AD (p < 0.05). Anapsos (360 mg/day) also increased cerebral blood flow velocities in left and right middle cerebral arteries in the subgroup of AD patients, whereas with the dose of 720 mg/kg this increase was only observed in the left side. Patients treated with anapsos (360 mg/day) showed a decrease in relative delta power and an increase in relative theta and alpha brain bioelectrical activity frequencies, indicating an acceleration of the EEG pattern. The present results show that anapsos (360 mg/day) improves cognitive performance, cerebral blood perfusion and brain bioelectrical activity in patients with senile dementia. These effects of anapsos were more marked in demented patients with mild mental deterioration and/or with dementia of the Alzheimer type.

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