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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 47 (1986), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: We have studied changes of cerebral monoamine metabolism and water content, during recirculation following global transient ischemia (20 min) using the four-vessel occlusion model in rats. Levels of monoamines and their metabolites were determined in cortex, striatum, hippocampus, and hypothalamus. Water content was evaluated by weight and by the analysis of Tl and T2 relaxation times in 1H-nuclear magnetic resonance. Norepinephine levels decreased; 3,4-dihydroxyphenylethylamine, 3,4-dihydroxyphenylacetic acid, and 5-hydroxytryptamine levels oscillated and levels of the end products homovanillic acid and 5-hydroxyindole-3-acetic acid increased. The regional changes were qualitatively similar but quantitatively different, and were greatest in the hippocampus, illustrating the concept of neuronal selective vulnerability. The changes suggest an initial monoarhine depletion and catabolism due to massive release from stores followed by autoregulatory processes. The water content increased moderately, with a maximum at 1 h. The variations of Tl were similar, positively correlated with water content and more pronounced in the cortex than in the white matter. T2 was markedly altered over the entire 24-h period. Those latter parameters are positively correlated with 5-hydroxytryptamine concentration in the hypothalamus consistent with a relationship between 5-hydroxytryptamine and cerebral edema.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    CNS drug reviews 2 (1996), S. 0 
    ISSN: 1527-3458
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1106
    Keywords: Calcium entry blockers ; Transient cerebral ischaemia ; Aminergic neurotransmitters ; Microdialysis ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cerebral ischaemia induces considerable neurotransmitter exocytosis, mediated by calcium entry in neurones, essentially via the N-type, voltage-dependent channels, which are insensitive to calcium blockers. Nonetheless, these blockers, by unclear mechanisms, exert a neuroprotective effect when used in experimental ischaemic models. On the other hand, the existence of L-type, voltage-dependent channels, the only ones responding to the action of calcium blockers on synapses, argues in favour of their possible concomitant action in certain highly pathological situations. We studied the action of three calcium blockers, nimodipine, diltiazem and verapamil (administered at a concentration of 100 μM directly into the striatum of rats), on the extracellular release of dopamine and serotonin, and on the level of their main metabolites, in a model of transient global cerebral ischaemia (four-vessel occlusion). The total absence of effect of these molecules on neurotransmitter release induced by ischaemia proves the non-involvement of this mechanism in the protective action of calcium entry blockers on ischaemic lesions, and the absence or very weak action of L-type, voltage-dependent presynaptic channels in the striatum of rats.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1106
    Keywords: Seizures ; Ischemia ; Aminergic Neurotransmitters ; Microdialysis ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The temporal profiles of aminergic neurotransmitter levels and of their acid metabolites after transient global cerebral ischemia in awake rats with and without subsequent seizures were compared using a microdialysis approach. In seizure animals, the post-ischemic levels of dopamine and serotonin were higher than the levels observed in the non-seizure controls. Inversely, the levels of the three neurotransmitter metabolites increased rapidly in the controls but not in seizure animals, where they remained at the low levels observed during and immediately after ischemia. This particular pattern is similar to that observed in rats submitted to prolonged ischemia or pretreated with monoamine oxidase inhibitors. In the seizure animals, neurotransmitter metabolites remained at low levels, as if the hypoxia had continued after the period of ischemia, inhibiting monoamine oxidase activity and, perhaps, neurotransmitter recapture.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2072
    Keywords: Key words Agitation ; Aggressiveness ; Dementia ; Antipsychotic ; Tiapride ; Elderly
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective: The aim of the present study was to compare the efficacy and safety of tiapride versus haloperidol and placebo in the treatment of agitation and aggressiveness in elderly patients with mild or moderate mental impairment. Method: This international, multicentre, randomized, double blind, three parallel groups study compared efficacy and safety of a 21-day regimen of tiapride 100–300 mg/day versus haloperidol 2– 6 mg/day and placebo in 306 elderly patients with mild or moderate dementia according to DSM III R and behavioural troubles with the Multidimensional Observation Scale for the Elderly Subjects (MOSES) irritability/aggressiveness subscore ranging from 16 to 30. Results: The percentage of responders (defined as patients with at least a 25% MOSES irritability/aggressiveness subscore decrease between the inclusion and the end of the treatment) was significantly greater in the tiapride (63%, P=0.04) and haloperidol (69%, P=0.004) groups than in the placebo group (49%), with no significant difference between the active drugs. Similar results were observed for the mean MOSES irritability/aggressiveness subscores on D7, D21 and at Dend which were significantly smaller in the tiapride and haloperidol groups than in the placebo group. The decrease between D0 and Dend was significantly greater in the tiapride (6.57, P=0.009) and haloperidol groups (6.75, P=0.005) than in the placebo group (4.71). The global improvement CGI was significantly better in the tiapride and haloperidol groups than in the placebo group (P=0.03 and P=0.02). No significant difference was observed between the two active drugs or among the three treatment groups for the Folstein’s Mini Mental Status scale (MMS) total score, and there was no notable change during treatment. The number of patients with adverse events, assessed on the Udvalg Kliniske Undersogelser scale (UKU), and the number of UKU symptoms were smaller in the tiapride group (62 patients, 61%, 212 events) than in the haloperidol group (77 patients, 76%, 305 events) and identical to that observed in the placebo group (69 patients, 67%, 234 events). Of interest, the number of patients with at least one extrapyramidal symptom was significantly lower (P=0.003) in the tiapride group (16 patients, 16%) than in the haloperidol group (34 patients, 34%) and similar to that of the placebo group (18 patients, 17%); the difference observed between the haloperidol and placebo groups was significant (P=0.008). Conclusion: Tiapride is not different from haloperidol in the treatment of agitation and aggressiveness in elderly patients and better tolerated, in particular with significantly fewer extrapyramidal symptoms.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-2072
    Keywords: Plasmatic renin activity ; Parkinson's disease ; l-Dopa ; Arterial blood pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Plasmatic renin activity (PRA) was studied in patients receiving l-dopa, together with a decarboxylase inhibitor, at rest times and after periods of physical exertion. Although we can superimpose the results from untreated Parkinson's disease patients on those of the control group, the results are inversed in stabilized patients (lowered PRA) and dyskinetic patients (increased PRA). There is a definite correlation between the increase in PRA and intensity of the dyskinesia. Dosage is the only other factor differentiating the two groups of Parkinsonians treated. The figures relative to arterial pressure are studied in the various groups.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-2072
    Keywords: Cognition ; Memory ; Depression ; Antidepressants ; Psychometry ; MAOI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The respective effects of three antidepressant drugs (moclobemide, 450 mg/j; viloxazine, 300 mg/j; maprotiline, 150 mg/j) on vigilance, attention, and memory were compared. Young depressed outpatients (n=46) entered a double-blind, randomised, monocentre clinical trial lasting for 6 weeks. Drug actions were assessed through the regular determination of critical flicker fusion point (CFF), reaction times (SRT), and a battery to measure memory components. None of the three drugs caused deterioration in cognitive functions. On the other hand, moclobemide improved both vigilance and attention (CFF, SRT) and some crucial components of memory (general memory scores, delayed word recall, recognition of familiar faces). This effect was rapid, stable, and superior to those of viloxazine and maprotiline. It may be explained by moclobemide's selective and reversible inhibition of monoamine oxidase A, as well as by the lack of any anticholinergic action.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-2072
    Keywords: Bromocriptine ; Dopaminergic mechanisms ; Plasma renin activity ; Blood pressure ; Extrapyramidal symptoms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A single oral intake of 10 mg of Bromocriptine can modify both plasma renin activity (PRA) and arterial blood pressure (BP). The changes in both variables depend on the integrity of the central dopaminergic systems. The parkinsonians whose extrapyramidal symptoms are markedly improved by l-Dopa in association with a decarboxylase inhibitor (IDC) and the untreated parkinsonians are the only patients whose PRA and BP are lowered 1 h after Bromocriptine ingestion. The results obtained in the l-dopainduced dyskinetic parkinsonians are similar to those obtained in the group of l-Dopa-resistant patients. This points to the paradoxical hypothesis of dopaminergic hyposensitivity in the dyskinetic patients. In spite of the absence of correlation between PRA and BP, it is possible that lowering of BP by Bromocriptine is linked to the parallel decrease of PRA. An increase of the BP may be obtained in the dyskinetic and l-Dopa-resistant groups. These data point to a possible involvement of central dopaminergic systems in some aspects of hypertension.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Four baboons receiving intramuscular iron for 15 months were compared with two control baboons. From the overall two-year observation period the following data emerge: (1) The baboon is a suitable animal for obtaining a massive and chronic iron overload. Liver iron concentrations reached very high levels (ranging from 41.3 to 180.6 μmol/100 mg dry weight vs 1.7±0.5, mean±sem, in controls), and a major liver iron overload (ie, with concentration values ≥ 18) was present in all four animals for an average period of 16.5 months (range 14–19). (2) When compared with human hepatic iron-overload disorders, iron distribution was similar to that observed in secondary (transfusional) hepatic siderosis since iron deposits were found primarily in sinusoidal cells. However, a marked parenchymal siderosis was also obtained close to that observed in primary (genetic) siderosis. Iron toxicity was present biologically as indicated by an increase in serum transaminases. Histologically, a slight fibrosis was observed in the most heavily ironoverloaded baboon. On the whole, this study of subhuman primates brings new evidence that ironper se has only a minor hepatic damaging effect. It also suggests that the ironoverloaded baboon liver provides a promising tool for the study of liver cell disturbances in human iron overload.
    Type of Medium: Electronic Resource
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