ABSTRACT
Thrombotic thrombocytopenic purpura (TTP) is a life-threatening disorder characterized
by microangiopathic hemolytic anemia and thrombocytopenia often accompanied by microvascular
ischemia, which may manifest as sensorimotor signs, visual changes, renal impairment,
cardiac ischemia, and abdominal pain, depending on the organs affected. Until a few
decades ago, TTP remained an almost universally fatal disorder. The introduction of
plasma exchange therapy (PE) with replacement of fresh frozen plasma has improved
the survival of patients with acute TTP dramatically from less than 10% to approximately
80 to 90% and is now considered the therapy of choice. During the last decade, the
understanding of the pathophysiology of thrombotic microangiopathies, especially TTP,
has increased considerably. The clinical features of thrombotic sequelae in TTP are
diverse and usually secondary to microvascular thrombosis. Clinical and laboratory
evidence for disruption of primary and secondary hemostasis, the role of endothelial
integrity and fibrinolysis, the relevance of large vessel thrombosis, and the prevalence
of thrombophilic states in TTP are discussed in this review. In summary, although
the syndrome of TTP can sometimes be confused with other thrombotic diatheses, it
is clear that the phenomenon of thrombosis in TTP appears to be distinctly different,
both biologically and clinically, from other causes of microangiopathy and/or antibody-mediated
thrombosis. Traditional anticoagulant and antiplatelet strategies are generally not
effective in patients with TTP, despite the predominance of thrombotic manifestations,
and common prothrombotic polymorphisms detected in patients with venous thromboembolism
are seldom present.
KEYWORDS
Thrombophilia - hypercoagulable state - thrombosis - thrombotic thrombocytopenic purpura
(TTP) - microangiopathy
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Thomas OrtelM.D. Ph.D.
Associate Professor, Hemostasis & Thrombosis Center, Duke University Health System,
Box 3422, Room 0563 Stead Building, Durham, NC 27710
eMail: thomas.ortel@duke.edu