Zusammenfassung
Als Folge der chronischen Lungenüberblähung kommt es bei COPD-Patienten zu einer Verkürzung der Atemmuskeln. Diese hat eine Absenkung und Abflachung des Zwerchfells zur Folge. Smith et al. weisen darauf hin, dass die resultierende Kraftentwicklung bei Verkürzung der Muskulatur vermindert ist [39]. Bei chronischer Verkürzung werden die seriell verknüpften Sarkomere zur Anpassung an die erhöhte Belastung zurückgebildet. Die Adaptation der Sarkomere kann die Verkürzung der Zwerchfellmuskulatur nur teilweise kompensieren, da die Veränderung der Geometrie und der Interaktion zwischen Zwerchfell und Thorax nur unzureichend ausgeglichen wird. Die Atemarbeit wird durch erhöhte Atemwegswiderstände, erhöhte Atemfrequenz und ungünstige Faserlänge der Atemmuskulatur, bedingt durch die Überblähung mit Abflachung des Zwerchfells und Verkürzung der Muskelfasern, negativ beeinflusst [40]. Die zusätzliche Rekrutierung der Atemmuskeln ist bei COPD-Patienten durch eine vermehrte Totraumventilation, Malnutrition, steroidinduzierte Muskelatrophie, erhöhte Atemwegswiderstände, reduzierte Elastizität des Lungenparenchyms (Compliance) und Retraktionskraft des Thorax mit hoher Atemarbeit und hohem Energieaufwand verbunden.
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van Gestel, A.J.R., Steier, J., Teschler, H. (2010). Primäre und sekundäre Atemmuskeln. In: Physiotherapie bei chronischen Atemwegs- und Lungenerkrankungen. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-01435-2_7
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