Results of treatment of 13 patients fulfilling the criteria for TTP are pre
sented. Thrombocytopenia was present in all patients (100%). Eleven of 13 p
atients (84.6%) had conciousness disorder, and seven of 13 patients (53.8%)
had renal impairment. Immunosuppressive therapy with plasmapheresis and re
placement of removed volume with fresh frozen plasma in a dosage of 25 ml/k
g body weight resulted in statistically significant increase of platelet co
unt (p = 0.0033). and significant improvement of consciousness as defined b
y increased Glasgow Coma Score (GCS) (p = 0.0524). In two patients, renal f
unction recovered and, in one patient, hemodialysis was no longer needed. T
his improvement in a small patient group has no statistical significance.