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  • 1
    Electronic Resource
    Electronic Resource
    USA/Oxford, UK : Blackwell Science Ltd
    Cephalalgia 15 (1995), S. 0 
    ISSN: 1468-2982
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The possible interaction of sumatriptan, a selective 5HT1-receptor agonist, with platelet responsiveness has been investigated. Stimulation of platelet rich plasma with sumatriptan (1–100 μM) did not induce shape change, aggregation or modification of intraplatelet cytosolic calcium levels. Total inhibition of aggregation induced by 20 μM 5HT was observed in platelets preincubated for 20 min with 100 μM sumatriptan. In the same model, platelet stimulation with 4 μM adenosine 5′-diphosphate (ADP), concentration known to induce an irreversible single-phase curve, determined a decrease of aggregatory response. Concentrations from I μM to 50 μM of sumatriptan did not influence the aggregatory response induced by 5HT and ADP. These effects appear not to be determined by modifications of platelet calcium homeostasis. The possibility to modulate platelet responsiveness by sumatriptan offers a further approach for evaluating the probable link between platelet behaviour and pathophysiology of migraine.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 70 (1981), S. 775-778 
    ISSN: 0305-0491
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 36 (1980), S. 449-450 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using Planaria motor performance as model, the authors confirm that Mn++ basically inhibits dopaminergic release with transitory hyper-release.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 236 (1989), S. 493-494 
    ISSN: 1432-1459
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1590-3478
    Keywords: Hyperglycemia ; cerebral blood flow ; cerebral plasma volume ; stroke
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Il flusso ematico cerebrale (CBF) e il volume plasmatico cerebrale (CPV) sono stati misurati in corso di iperglicemia costante negli emisferi e nel tronco-cervelletto di ratti. Sono stati studiati tre gruppi di ratti, ciascuno con un diverso livello glicemico, 25, 33.3, 44.4 mml/L e un gruppo normoglicemico di controlo (8–9 ml/L). CBF è risultato immodificato ai livelli iperglicemici di 25 e 33.3 mml/L. Al livello iperglicemico più alto, i valori medi emisferici e del tronco-cervelletto sono risultati più bassi che nel controllo, benché le differenze non fossero statisticamente significative. CPV è stato trovato immodificato alla iperglicemia di 25 mml/L, mentre era aumentato ai livelli di 33.3 e 44.4 mml/L. I risultati dello studio non sono consistenti coll'ipotesi che l'iperglicemia favorisca il danno ischemico attraverso una riduzione del CBF.
    Notes: Abstract Cerebral blood flow (CBF) and cerebral plasma volume (CPV) were measured under steady-state hyperglycemic conditions in the hemispheres and brainstem-cerebellum of conscious rats. There groups of hyperglycemic animals each having a different level of plasma glucose concentration, 25,33.3, 44.4 mmol/l, and a normoglycemic control group were studied. CBF was not affected at the hyperglycemic levels of 25 and 33.3 mmol/l. Mean hemispheric and brainstem-cerebellum CBF values appeared lower than in controls at the highest glycemic level althoug the differences were not statistically significant. CPV was found to be unchanged at the hyperglycemic level of 25 mmol/l, while it was found to be increased in the hemispheres of the animals whose plasma glucose concentration had been elevated to 33.3 and 44.4 mmol/l. The results of the study do not support the claim that hyperglycemia may enhance ischemic brain injury by reducing CBF.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1590-3478
    Keywords: Transient ischemic attacks ; brain protection ; stroke ; risk factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Abbiamo studiato una serie consecutiva di soggetti (812) a rischio di “stroke”; nell'ambito di questa serie abbiano selezionato 100 pazienti che sembravano costituire un sottogruppo ad alto rischio (excessive risk of stroke=ESR). Le caratteristiche di inclusione nel gruppo ESR erano le seguenti: a) attacchi ischemici reversibili multipli in un territorio carotideo; b) lesioni steno-occlusive monolaterali multiple o bilaterali. Il gruppo a) era trattato con terapia medica, il gruppo b) con terapia chirurgica. Tutti i pazienti ESR sono stati seguiti per 12 mesi. Durante il follow-up si sono verificati episodi cerebrovascolari focali in 29 soggetti (17 strokes e 12 ischemie reversibili). Nel gruppo chirurgico gli episodi cerebrovascolari si sono presentati soprattutto nel periodo peri-operatorio (entro la 7a giornata) e solo in pochi casi a distanza di tempo (da 1 a 6 mesi). Nel gruppo medico gli end-points si sono distribuiti durante tutto il periodo di follow-up (12 mesi). Il presente studio suggerisce che è possibile individuare a priori sottogruppi di pazienti a rischio eccessivo di stroke, facilitando l'attuazione di trials clinici di “brain protection”. Infatti, arruolando tali pazienti, è sufficiente condurre lo studio in un numero minore di soggetti piuttosto che non prendendo in esame una popolazione non selezionata, dove la frequenza di nuovi eventi è molto inferiore.
    Notes: Abstract From a consecutive series of 812 patients at risk of stroke we selected 100 who seemed to be at high risk (excessive stroke risk—ESR) on the following clinical criteria: either multiple reversible ischemic attacks in one carotid territory or multiple (or bilateral) severe stenotic carotid lesions. The patients of the first subgroup received medical therapy and those of the second were referred for surgery. The 100 patients were followed up for 12 months, during which 29 patients had cerebral ischemic events: 17 having stroke and 12 TIA. This study suggests that it is possible to identify beforehand subgroups of ESR patients, thereby facilitating the selection of patients for brain protection and avoiding huge trials of unselected cerebrovascular patients.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0878
    Keywords: Photosensitization ; Nervous system ; Planaria ; Eosin ; Hematoporphyrin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Photosensitization phenomena may be induced in planarias by eosin and hematoporphyrin, and as a result, dopamine agonistic behavior (“screw-like” hyperkinesia) is set up in the animal. Histochemical, ultrastructural and pharmacological investigations have shown that this hyperkinesia is of postsynaptic origin in eosin photosensitization, and of pre-synaptic origin in hematoporphyrin photosensitization. The authors suggest an hypothesis to explain the different activity of the two photosensitizers, and discuss the validity of the experiment with regard to human porphyria.
    Type of Medium: Electronic Resource
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