[Thrombotic thrombocytopenic purpura: experience in 18 cases and literature review].
BACKGROUND
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.


OBJECTIVE
To report the experience in 18 patients with TTP.


METHODS
Retrospective assessment of 11 patients and prospective assessment of seven subjects with TTP, aged 15 to 81 years.


RESULTS
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.


CONCLUSIONS
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 .
Departamento de Hematología y Oncología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Chile. geymin@med.puc.cl
Gonzalo
G
Eymin
Maricarmen
M
Andrade
Max
M
Andresen
Jaime
J
Pereira
D051722:ADAM Proteins / Q000097:blood; D000071120:ADAMTS13 Protein; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010956:Plasmapheresis; D011446:Prospective Studies; D011697:Purpura, Thrombotic Thrombocytopenic / Q000175:diagnosis / Q000201:enzymology / Q000628:therapy; D012189:Retrospective Studies
D051722:ADAM Proteins; D000071120:ADAMTS13 Protein; C099604:ADAMTS13 protein, human