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Thrombozyten und Gerinnung

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Pädiatrie

Zusammenfassung

An den Aufgaben der Hämostase, die Fließfähigkeit des Bluts optimal zu erhalten und gleichzeitig Blutverluste nach Verletzungen zu verhindern, sind im Wesentlichen 3 Systeme beteiligt:

  1. 1.

    das Gefäßsystem selbst, ausgekleidet mit Endothel, das den Durchtritt von Wasser, Ionen, Sauerstoff, CO2, Nährstoffen, Stoffwechselprodukten, Proteinen und zellulären Komponenten ermöglichen, auf der anderen Seite jedoch den Austritt von Blut verhindern soll,

  2. 2.

    die Blutplättchen oder Thrombozyten und

  3. 3.

    die plasmatische Gerinnung.

Gefäßwand und Thrombozyten kooperieren in der primären Hämostase. Den Vorgang der Blutgerinnung bezeichnet man als sekundäre Hämostase, an der neben den eigentlichen Gerinnungsfaktoren, deren Inhibitoren und den Faktoren der Fibrinolyse auch die Thrombozyten einen wesentlichen Anteil haben.

Das zentrale Enzym der Hämostase ist Thrombin – wie die meisten der enzymatisch aktiven Gerinnungsfaktoren eine Serinprotease. Es ist der letztlich wirksame Faktor, der aus Fibrinogen proteolytisch Fibrinmonomere als Grundsubstanz für das Fibringerüst erzeugt. Die Generation von Thrombin ist das Produkt der Gerinnungskaskade, an der neben anderen aus Zymogenen aktivierten Serinproteasen, wie FXIIa, FXIa, FIXa, FVIIa, FXa, auch Kofaktoren wie FVIIIa sowie FVa beteiligt sind (Abb. 180.1).

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Schneppenheim, R., Bergmann, F. (2014). Thrombozyten und Gerinnung. In: Hoffmann, G., Lentze, M., Spranger, J., Zepp, F. (eds) Pädiatrie. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-41866-2_180

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