A patient with a genetic mutation has dysfunctional von Willebrand factor (vWF). Why does this compromise the initial stages of hemostasis in small blood vessel injuries?

💡 Explanation

vWF acts as a bridge between platelets and collagen in the subendothelial matrix, promoting initial platelet adhesion and aggregation. Without functional vWF, the platelet aggregation is impaired at the site of injury because vWF-mediated adhesion is compromised; therefore, the initial hemostatic plug cannot form effectively, rather than thrombin activation or fibrinogen crosslinking being directly affected.

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