What are the signs and symptoms of thrombosis in paroxysmal nocturnal hemoglobinuria (PNH)?

Updated: May 20, 2021
  • Author: Emmanuel C Besa, MD; Chief Editor: Sara J Grethlein, MD, FACP  more...
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Thrombosis involves the venous system, and it typically occurs in unusual veins, namely the hepatic, abdominal, cerebral, and subdermal veins. The tendency of patients with PNH to suffer thrombosis has been recognized as a major part of the syndrome and interpreted as a very bad prognostic sign and the most common cause of death in PNH. About 30-40% of patients of European origin have serious thrombosis at some time; for unexplained reasons, only 5-10% of patients of East Asian (Chinese, Japanese, and Thai) or Mexican origin develop this complication. [20, 21]

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