Störungen des autobiographischen Gedächtnisses bei Alzheimer-Demenz
Abstract
Zusammenfassung: Störungen der Gedächtnisfunktionen bilden das Achsensymptom demenzieller Erkrankungen, insbesondere der Alzheimer-Demenz (AD) als ihrer häufigsten Form. Gerade Defizite des autobiographischen Gedächtnisses entstehen schon in den Anfangsstadien der Erkrankung und betreffen primär Erinnerungen an selbst Erfahrenes einschließlich prägender Lebensereignisse, während äußere Lebensdaten noch lange abrufbar bleiben. Autobiographische Gedächtnisdefizite wurden nur selten untersucht, vor allem da derartige Studien besondere methodische Anforderungen stellen, die sich aus der Individualität des erinnerten Materials und dem Charakter demenzieller Erkrankungen ergeben. Wir haben deshalb autobiographische Gedächtnisdefizite differenziert nach semantischen und episodischen Qualitäten mit dem “Bielefelder Autobiographischen Gedächtnisinventar” (BAGI) in einer modifizierten Version bei 230 Heimbewohnern (24 kognitiv Gesunde; 28 mit leichter kognitiver Beeinträchtigung; 178 mit manifester AD) untersucht. Eine nachhaltige Beeinträchtigung des autobiographischen Gedächtnisses zeigte sich dabei schon in frühen Phasen der AD. Bereits Bewohner mit leichter kognitiver Beeinträchtigung wiesen ausgeprägte Defizite des episodischen Gedächtnisses auf, die bei mittelgradiger oder schwerer AD fortbestanden. Demgegenüber gingen semantische autobiographische Gedächtnisinhalte graduell verloren, sodass weitreichende Defizite erst bei stark Eingeschränkten entstanden. Die Kenntnis dieser Zusammenhänge vertieft nicht nur unser Verständnis der Alzheimer- Demenz, sondern erweitert auch das verfügbare diagnostische Instrumentarium.
Abstract: Memory decline in general and autobiographical memory deficits in particular are the core symptoms of Alzheimer's disease (AD). The respective deficits can be observed even in the early stages of the disease, and mainly involve personal experiences including important lifetime events, rather than semantic biographical data. To investigate this observation in a large clinical sample and to standardize its examination, the respective deficits were documented on a modified version of the “Bielefeld Autobiographical Memory Inventory” (BAGI) in 230 nursing home residents (24 without cognitive deficits, 28 with mild cognitive impairment and 178 with AD). Even residents with mild cognitive impairment or early AD showed marked deficits of episodic autobiographic memory, which were even more pronounced in moderate and severe dementia. In contrast, semantic memory contents declined gradually with pronounced deficits only in severe dementia. These findings confirm and extend our understanding of autobiographical memory decline in AD and indicate that the respective deficits can be used as an early marker of the disease.
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