Zusammenfassung
Wundheilung ist ein komplexes Geschehen, das die morphologische und funktionelle Wiederherstellung von zerstörtem Gewebe zum Ziel hat. Die physiologische Wundheilung umfasst verschiedene, sich überlappende und teilweise parallel ablaufende Phasen. Die Regulation der fein aufeinander abgestimmten Schritte erfolgt durch Zytokine und Wachstumsfaktoren aus Zellen der Wundumgebung und der Wunde selbst.
Nach einer Verletzung wird zunächst die Wunde durch ein Fibrinkoagulum provisorisch verschlossen. Entzündungszellen werden rekrutiert und wandern ein: neutrophile Granulozyten und Monozyten/Makrophagen eliminieren Keime und Debris. Makrophagen stimulieren schließlich die Einwanderung und Proliferation von Fibroblasten und die Angiogenese. Das Granulationsgewebe füllt den Gewebedefekt auf und bildet eine neue extrazelluläre Matrix, Wundkontraktion beschleunigt den Wundverschluss. Parallel dazu erfolgt die Reepithelisierung des Defektes.
Der Wundheilungsprozess kann durch vielfältige lokale Störungen und systemische Grundkrankheiten gebremst werden. Der Heilungsprozess bleibt in diesem Fall meist in der Entzündungsphase, seltener in der Granulationsphase stecken. Die Folge ist eine chronische Wunde, die dann trotz aller therapeutischen Bemühungen nicht in einer angemessenen Zeitspanne abheilt. Entzündung, Gewebeschädigung durch überschießende Proteaseaktivität und freie Sauerstoffradikale sowie Proliferationsschwäche der Fibroblasten (Seneszenz) sind pathogenetische Merkmale dieser Heilungsstörung (Ausführliche Übersichtsarbeiten zur Biologie der Wundheilung
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Auböck, J. (2007). Biologie der Wundheilung. In: Wild, T., Auböck, J. (eds) Manual der Wundheilung. Springer, Vienna. https://doi.org/10.1007/978-3-211-69454-1_1
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