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A randomized, double-blind trial on the effects of GM₁ ganglioside in cerebrovascular diseases was done on 40 patients; the treatment (40 mg/day i.m. injection) began after the acute phase and lasted 6 weeks. 18 cases took the drug and 16 the placebo. The evaluation of the cases was made by graduating the severity of the clinical signs, and some neurophysiological and morphological parameters, i.e., EEGs, flash-evoked potentials and computer tomography scans. We found that the drug, in comparison with the placebo treatment, improved the clinical signs and also the neurophysiological parameters, whereas it was ineffective for the morphological damage. These data seem of some interest in relation to the action of GM₁ ganglioside in the processes of neurotransmission and neuronal plasticity as described in the experimental animal.

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