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  • Brain involutional process  (1)
  • Contingent negative variation  (1)
  • Hyperammonaemia  (1)
  • Key words Presenile primary dementia  (1)
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Years
Keywords
  • 1
    ISSN: 0167-8760
    Keywords: Bit color mapping ; Brain involutional process ; CNV ; Cognitive potential ; Presenium
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1126-5442
    Keywords: Key words Presenile primary dementia ; Clinical/neuropsychological examinations ; Differential diagnosis ; Seven-year follow-up
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Early diagnosis of presenile Alzheimer's disease (AD), which would serve for prognosis and for guiding choices of treatment, is still an important, difficult task for the clinical neurologist. We studied 24 patients, 12 of whom had minor cognitive impairment or questionable dementia (PICD) and 12 who met NINCDS-ADRDA criteria for presenile AD (PAD). Using clinical, neuropsychological, neurophysiological and neuroradiological methods, we followed the patients up to two disease end-points. All PAD patients evolved into clinically evident Alzheimer-type dementia, became untestable within 60 months and died within 72 months. Only 3 of the PICD patients became demented; 2 of them died during the follow-up and 1 died eight months later. The other 9 PICD patients showed only moderate cognitive decline, compatible with normal aging processes. Neurophysiological and neuroradiological findings might be an important tool for arriving at a correct early diagnosis, when they are assessed with clinical neuropsychological data.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 232 (1985), S. 167-168 
    ISSN: 1432-1459
    Keywords: Valproic acid ; Hyperammonaemia ; Adverse effects ; Identical twins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cases of two epileptic identical twins are described, one of whom had presented an episode of valproate (VPA)-induced stupor associated with very high blood ammonia (NH3) concentrations. Both twins showed a similar marked increase of venous NH3 concentrations after the administration of a single loading dose of VPA (800 mg).
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1590-3478
    Keywords: Contingent negative variation ; RT ; presenile cognitive decline ; presenile Alzheimer dementia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Scopo della presente ricerca è lo studio mediante metodiche standard di averaging, delle modificazione dell'onda d'aspettativa, sue principali componenti (complesso CNV) e tempo di reazione (RT) delle risposte motorie in pazienti affetti da forme iniziali più o meno gravi di decadimento mentale presenile idiopatico. Sono stati esaminati 19 pazienti (età media: 59.5) e 10 soggetti sani di controllo di pari età (media: 59.6). Otto pazienti presentavano un quadro clinico di demenza presenile di tipo Alzheimer (PAD), mentre in 11 soggetti era stata formulata una diagnosi di possibile forma iniziale presenile di demenza primaria (PICD) poiché non raggiungevano i criteri clinici del DSM-III e del NINCDS-ADRDA Report. Tutti i pazienti sono stati sottoposti preliminarmente and esami clinici, TAC, NMR, EEG con analisi spettrale ed a test psicodiagnostici. Per evocare il complesso CNV-RT si è adottato un parametro di stimolazione molto semplice ed idoneo anche per malati con deterioramento mentale. Oltre all'EOG ed agli RT, l'attività di tipo CNV è stata registrata da regioni frontali, centrali e parietali con referenza bimastoidea. Si sono osservate differenze significative di alcuni componenti fra i gruppi di soggetti esaminati e nella maggioranza dei dementi mancava una vera attività di tipo CNV, gli RT erano enormemente prolungati e sovente si sono registrati caratteristici “post-imperative negative variations” (PINV). I risultati ottenuti confermano l'utilità di queste metodiche nella diagnosi precoce delle demenze primarie presenili.
    Notes: Abstract The so-called contingent negative variation (CNV) is a slow brain potential representing a complex of variously overlapped “endogenous” components of behavior related to different reasonably well-known neurocognitive processes. CNV complex evoked with a standard paradigm (S1-2 sec-S2-motor response) and reaction time (RT) to imperative signal (S2) were recorded and measured in 11 patients with initial presenile idiopathic cognitive decline (PICD), 8 with presenile Alzheimer-type dementia (PAD) and 10 healthy age-matched controls. Significant group differences were obtained for measures of some CNV components, particularly of the late pre-S2 CNV. No significant CNV activity, very prolonged RTs and sometimes characteristic post-imperative negative variation (PINV) were observed in the majority of patients with PAD. These results suggest that CNV complex and RT changes similar to those observed in our patients may constitute a valuable clue for the study of pathophysiological brain functioning in the early stages of presenile idiopathic mental deterioration.
    Type of Medium: Electronic Resource
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