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Pathophysiologie des Katabolismus bei unterernährten alten Patienten*

Physiopathology of the catabolism associated with malnutrition in the elderly

  • PATHOPHYSIOLOGIE DER MALNUTRITION
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Zeitschrift für Gerontologie und Geriatrie Aims and scope Submit manuscript

Summary

Malnutrition is a common finding amongst our elders. The causes of malnutrition are multifactorial and although they have been extensively studied, they are not entirely understood. Both physiological and pathological processes of aging put this population at a higher risk of being undernourished. These may be related to social, financial, psychological and/or physiological changes directly or indirectly associated to growing old.

Age associated changes increase the risk of malnutrition in older individuals. These alterations range from problems in taste and smell perception, which were previously thought to be the main cause of anorexia in this population, to alterations in either the concentration or efficacy of the previously mentioned feeding modulators.

Increased intestinal malabsorption together with an altered pancreatic exocrine response to different diets, further contributing to subclinical malabsorption in the elderly population aged and may account in part for the malnutrition observed in this group.

Although not directly caused by the aging process, several conditions such as anorexia nervosa, cancer, infectious conditions, and inflammatory processes are associated with decreased food intake and weight loss. These conditions present with elevated levels of immunoregulatory substances known as cytokines. Each of these cytokines has multiple effects and play a leading role in the pathophysiology and maintainance of malnutrition in these situations.

Zusammenfassung

Unterernährung ist bei älteren kranken Personen ein häufiger Befund. Die Ursachen der Unterernährung sind multifaktoriell. Obwohl sie intensiv erforscht wurden, sind sie nicht restlos geklärt. Aufgrund physiologischer als auch pathologischer Prozesse, die mit dem Altern einhergehen, ist diese Bevölkerungsgruppe einem höheren Risiko der Unterernährung unterworfen. Diese Vorgänge sind hauptsächlich auf soziale, finanzielle, psychologische und physiologische alternsbedingte Veränderungen zurückzuführen.

Altersbedingte Ursachen mit erhöhtem Risiko für Malnutrition reichen von Problemen mit der Geschmacks- und Geruchswahrnehmung, die früher als Hauptgrund für die Anorexie bei Betagten angesehen wurden, bis zu Veränderungen der Konzentration oder der Wirksamkeit von appetitmodulierenden Hormonen und Neurotransmittern.

Wichtig scheint auch eine verstärkte intestinale Malabsorption und eine beeinträchtigte exokrine Pankreasfunktion bei der älteren Bevölkerung, die sicher teilweise für die in dieser Gruppe zu beobachtende Malabsorption verantwortlich ist. Man spricht auch von einer subklinischen Malabsorption Betagter.

Bei kranken Betagten spielen auch verschiedene Zustände, die nicht direkt durch den Alterungsprozeß bedingt sind, eine wichtige Rolle bei der Entstehung und Aufrechterhaltung der Malnutrition. Dazu gehören Entzündungen, Verletzungen, Neoplasmen und chronische Krankheiten. In diesen Situationen spielen Cytokine wie IL-1 und Cachektin in der Pathophysiologie der Unterernährung eine dominierende Rolle.

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*Aus dem Englischen übersetzt von Ernst Grell, lic. phil., Maiengasse 25, CH-4056 Basel, Schweiz

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Baez-Franceschi, D., Morley, J.E. Pathophysiologie des Katabolismus bei unterernährten alten Patienten*. Z Gerontol Geriat 32 (Suppl 1), S12–S19 (1999). https://doi.org/10.1007/s003910050175

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