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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 425 (1984), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0942-0940
    Keywords: Somatosensory evoked potentials ; EEG monitoring ; stump pressure ; carotid clamping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors have reported on the prognostic value of continuous monitoring of somatosensory evoked potentials (SEP) in a survey of 25 patients who underwent carotid surgery. SEP recordings were correlated with the EEG, stump pressure (SP) values and clinical outcome. A non-cephalic reference was used for SEP recordings to allow the analysis of both subcortical and cortical components. During surgery the conduction time between SEP peaks relating to the subcortical components remained stable or showed minimum variations in all patients. During carotid clamping, SEP variations were observed in 9 out of 25 cases (36%). The application of an intraluminal shunt was accompanied by the return to normal values in 7 out of 9 patients. In the remaining two cases SEP abnormalities continued post-operatively and were accompanied by new neurological deficits. EEG changes during carotid clamping were associated with SEP modifications in 6 out of 7 cases, although they were not always correlated. Results confirm that SEP recordings provide useful data concerning the function of the CNS in anaesthetized patients and that, being sensitive to CBF changes, SEP monitoring acts as an indicator of cerebral ischaemia.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1590-3478
    Keywords: Nitrous oxide ; contingent negative variation ; reaction time ; EEG power spectrum measures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Il protossido di azoto(N2O) è un gas anestetico largamente utilizzato, ma non è ancora ben conosciuto il suo modo di azione né la sua distribuzione nel SNC. Scopo di questa ricerca è stato quello di valutare gli effetti di tale gas a basse dosi (10 per cento) sul SNC nell'uomo. Sono state condotte registrazioni dell'onda di aspettativa (CNV) del tempo di reazione e dello spettro di potenza dell'EEG in cinque soggetti sani volontari, mentre questi respiravano aria e poi mentre respiravanoN2O al 10 per cento. È stata riscontrata una significativa riduzione dei parametri positivi post-imperativi della CNV durante l'uso diN2O mentre non venivano osservate variazioni dello spettro di potenza e del tempo di reazione. Tali risultati potrebbero essere attribuiti ad una precoce interferenza dell'N2O sui processi che sottendono la risoluzione della CNV, anche quando sono ancora integre la vigilanza e l'attenzione.
    Notes: Abstract Nitrous oxide(N2O) is a widely used inhalational anesthetic gas, but its exact mode of action and its distribution in the CNS are not yet well known. The aim of this research was to study the effects of N2O at low doses (10 percent) in the CNS of humans. Five healthy volunteers were tested. Contingent Negative Variation (CNV), Reaction time (RT) and quantified EEG recordings were taken while subjects were breathing air and thenN2O. A significant reduction of the postimperative positive CNV components during N2O inhalation was observed;no changes in EEG power spectrum and RT values were seen. These results could be consistent with an earlyN2O interference with processes underlying CNV resolution, while vigilance and attention were still maintained.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1590-3478
    Keywords: Cerebrovascular disease ; platelet aggregation ; platelet hyperaggregation ; transient ischemic attacks ; stroke
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario 148 pazienti con varie forme di malattia cerebrovascolare, sono stati studiati con analisi multiparametriche dell'aggregazione piastrinica in vitro sulla base dei seguenti sei parametri: le soglie di aggregazione primaria e secondaria e l'aggregazione massima percentuale indotta da ADP ed Epinefrina. Questi pazienti sono stati suddivisi in 4 gruppi di studio in accordo con la diagnosi clinica confortata dai dati della TAC e cioè: TIA, RIND, o rammollimento in presenza o in assenza rispettivamente di un trattamento antiaggregante nel momento dello studio. È stato trovato un aumento statisticamente significativo dell'aggregazione in vitro delle piastrine nel 44.4% dei casi TIA, RIND non trattati e nel 33,9% dei casi di rammollimento non trattati. Quest'ultimo gruppo, però, ha dimostrato una più alta percentuale di iperaggregazione molto marcata. Le differenze tra i 2 gruppi di studio trattati con antiaggreganti e i controlli non erano significative. Inoltre nessuna differenza è stata riscontrata tra i gruppi e i controlli nell'aggregazione indotta da collageno e ristocetina.
    Notes: Abstract 148 patients with various forms of cerebrovascular disease (CVD) were studied by means of a multiparametric analysis ofin vitro platelet aggregation, based on the following six parameters: ADP and epinephrine primary and secondary aggregation thresholds and percent maximum aggregation induced by optimal concentrations of ADP and epinephrine. These patients were assigned to four study groups, according to clinical diagnosis supported by CT scan, of transient ischemic attack and reversible neurological deficit (TIA-RIND), or completed stroke, in the presence or absence respectively of antiplatelet medical treatment at the time of the study. A statistically significant increase of thein vitro platelet aggregation was found in 44.4% of the untreated TIA-RIND patients and in 33.9% of the untreated stroke patients. However this last group showed a higher percentage of very marked hyperaggregation. Differences between the two treated study groups and controls were not signicant. No difference was found in collagen-and ristocetin-induced aggregation between the patient groups and the controls.
    Type of Medium: Electronic Resource
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