Thrombotic thrombocytopenic purpura: experience in 18 cases and literature review

Thrombotic thrombocytopenic purpura (TTP) is characterized by anemia, thrombocytopenia, neurological and renal involvement of variable severity and it has a dismal prognosis. Platelet-derived von Willebrand Factor-cleaving metalloprotease ADAMTS-13 activity may orient the diagnosis, but normal level...

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Bibliographic Details
Published in:Revista medíca de Chile 2008-12, Vol.136 (12), p.1518-1527
Main Authors: Eymin, Gonzalo, Andrade, Maricarmen, Andresen, Max, Pereira, Jaime
Format: Article
Language:Spanish
Subjects:
ADAM Proteins - blood
ADAMTS13 Protein
Adolescent
Adult
Aged
Aged, 80 and over
Female
Humans
Male
Middle Aged
Plasmapheresis
Prospective Studies
Purpura, Thrombotic Thrombocytopenic - diagnosis
Purpura, Thrombotic Thrombocytopenic - enzymology
Purpura, Thrombotic Thrombocytopenic - therapy
Retrospective Studies
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Summary:Thrombotic thrombocytopenic purpura (TTP) is characterized by anemia, thrombocytopenia, neurological and renal involvement of variable severity and it has a dismal prognosis. Platelet-derived von Willebrand Factor-cleaving metalloprotease ADAMTS-13 activity may orient the diagnosis, but normal levels do not discard it. The most effective therapy thus known is plasmapheresis. To report the experience in 18 patients with TTP. Retrospective assessment of 11 patients and prospective assessment of seven subjects with TTP, aged 15 to 81 years. All presented with anemia, thrombocytopenia and LDH elevation. Sixteen had neurological symptoms, five had fever, four had macroscopic urinary excretion of pigments, four had petechiae, and two had nosebleeds. Haptoglobin was low in 10 of 11 patients in whom it was measured. ADAMTS-13 had low activity in 15 of 17 patients (in 11, the inhibitor was found). Seventeen patients were treated with plasmapheresis and nine received steroids also. Seven patients died due to shock with respiratory involvement or multiple organic failure. TTP has heterogeneous modes of presentation. If the diagnosis is strongly suspected, plasmapheresis can be started without laboratory confirmation. An ADAMTS-13 activity below 6% is almost exclusive of TTP .
ISSN:0034-9887