ABSTRACT
Paroxysmal nocturnal hemoglobinuria is a disorder associated with hemolysis, pancytopenia,
and thrombosis due to the loss of the glycosylphosphatidylinositol (GPI) anchored
complement regulatory proteins. The mechanism of thrombosis is multifactorial. Although
intravascular hemolysis has been implicated as the etiology, the effect of complement
on GPI anchor-deficient platelets, granulocytes, monocytes, and endothelial cells
contributes significantly to the risk of thrombosis. Moreover, there appears to be
an underlying inflammatory state that is linked to hemostatic activation that may
induce thrombosis through a pathway independent of hemolysis.
KEYWORDS
PNH - hemolysis - thrombosis
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Ilene Ceil WeitzM.D.
Associate Clinical Professor of Medicine, Jane Anne Nohl Division of Hematology, Keck-USC
School of Medicine
Los Angeles, CA
Email: iweitz@usc.edu