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Development and validation of a predictive model for death in acquired severe ADAMTS13 deficiency-associated idiopathic thrombotic thrombocytopenic purpura: the French TMA Reference Center experience.
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Edité par CCSD ; Ferrata Storti Foundation -
International audience. Background. Acquired thrombotic thrombocytopenic purpura is still associated with a 10-20% death rate. So far, early prognostic factors of death could not be clearly identified. To identify prognostic factors associated with 1-month death in thrombotic thrombocytopenic purpura patients with acquired severe (< 10% of normal activity) ADAMTS13 deficiency.Design and Methods. Prospective cohort of patients included between October, 2000, and August, 2010. A validation cohort of patients was set up from September, 2010 to August, 2011. 281 (analysis cohort) and 66 (validation cohort) consecutive adult thrombotic thrombocytopenic purpura patients with acquired severe ADAMTS13 deficiency. 30-day mortality after treatment initiation according to characteristics at inclusion.Results. Non-survivors (11%) were older (P=10-6) and presented more frequently arterial hypertension (P=5.10-4) and ischemic heart disease (P=0.013). Prognosis was increasingly poor with age (p=0.004). On presentation, cerebral manifestations were more frequent in non-survivors(P=0.018) and serum creatinine level was higher (P=0.008). The most significant independent variables for determining death were age, severe cerebral involvement and LDH level >=10N. A 3-level risk score for early death was defined and confirmed in the validation cohort using these variables, with higher values corresponding to increased risk of early death.Conclusions. A risk score for early death was defined in patients with thrombotic thrombocytopenic purpura and validated on an independent cohort. This score should help to stratify early treatment and intensify patients with a worse prognosis.
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