Rheumatology 2001; 40: 940-942
© 2001 British Society for Rheumatology
Paediatric Rheumatology |
Acquired deficiency of von Willebrand factor-cleaving protease in a patient suffering from acute systemic lupus erythematosus
Paediatric Rheumatology/Series Editor: P. WooLetters to the Editor
University Children's Hospital, Division of Paediatric Immunology/Haematology, Zürich, and
1 Central Haematology Laboratory, University Hospital, Inselspital, Bern, Switzerland
SIR, Thrombotic thrombocytopenic purpura (TTP) is a well-known complication in established rheumatic diseases, especially in patients with systemic lupus erythematosus (SLE) (estimated incidence 14%). Post-mortem examination of SLE patients suggests that this association may be present in a significantly higher percentage of SLE patients succumbing to multi-organ system failure [1, 2].
TTP is a syndrome characterized by the pentad of thrombocytopenia, haemolytic microangiopathy, fluctuating neurological deficits, renal dysfunction and fever [3]. However, it has been observed that many patients with TTP may lack one or more of these criteria. The complete clinical pentad, characteristic of TTP, is entirely present in only about 3040% of patients [4]. TTP may precede the onset of
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