Abstract
1. 1. The effect of electroconvulsive shock (ECS) on the extracellular concentration of dopamine (DA), dihydroxyphenylacetic acid (DOPAC), homovanillic acid (HVA) and 5-hydroxyindoleacetic acid (5-HIAA) was examined in the frontal cortex of rats with the use of in vivo microdialysis. 2. 2. The extracellular concentration of DOPAC, HVA and 5-HIAA was largely increased after the first ECS treatment. The increase after the eighth ECS treatment tended to be attenuated or was significantly attenuated as compared to that after the first ECS treatment. The baseline concentration of DOPAC and 5-HIAA was significantly increased after repeated ECS, though that of DA and HVA did not show any significant change after repeated ECS. 3. 3. These results suggest that the activating effect of repeated ECT on 5-hydroxytryptaminergic (5-HT) and DA neurotransmission, (especially on 5-HT neurotransmission), is significant in improving depression both in patients with Parkinson's disease (PD) and in those who do not suffer from PD.
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