1/118. Transient hypoplastic anemia caused by primary human parvovirus B19 infection in a previously untreated patient with hemophilia transfused with a plasma-derived, monoclonal antibody-purified factor viii concentrate.BACKGROUND: Modern plasma-derived clotting factor concentrates are produced using various virus-inactivation protocols and are assumed to be safer than they were previously with regard to the risk for transmitting viral infections such as human immunodeficiency virus, hepatitis b, and hepatitis c. The risks from viruses that are relatively resistant to the current inactivation procedures remain uncertain. PATIENT: A 7-year-old with mild hemophilia a who had not been previously infused with any blood products was treated with a plasma-derived, monoclonal antibody-purified factor viii concentrate to cover orthopedic surgery after traumatic fracture of his left arm. RESULTS: A typical primary human parvovirus (HPV)-B19 infection was observed associated with transient hypoplastic anemia. retrospective studies including serologic examination and polymerase chain reaction analysis confirmed that the HPV-B19 infection was transmitted by the factor viii concentrate. CONCLUSIONS: Clotting factor concentrates for the treatment of hemophilia retain a risk for HPV-B19 contamination. HPV-B19 viral infection might induce hypoplastic anemia in these patients, particularly during enhanced hemopoiesis after acute blood loss.- - - - - - - - - - ranking = 1keywords = plasma (Clic here for more details about this article) |
2/118. Antifactor VIII antibody inhibiting allogeneic but not autologous factor viii in patients with mild hemophilia a.Two unrelated patients with the same Arg2150His mutation in the factor viii (FVIII) C1 domain, a residual FVIII activity of 0.09 IU/mL, and inhibitor titres of 300 and 6 Bethesda Units, respectively, were studied. Further analysis of patient LE, with the highest inhibitor titer, showed that (1) plasma or polyclonal IgG antibodies prepared from LE plasma inhibited the activity of allogeneic (wild-type) but not of self FVIII; (2) the presence of von Willebrand factor (vWF) increased by over 10-fold the inhibitory activity on wild-type FVIII; (3) the kinetics of FVIII inhibition followed a type II pattern, but in contrast to previously described type II inhibitors, LE IgG was potentiated by the presence of vWF instead of being in competition with it; (4) polyclonal LE IgG recognized the FVIII light chain in enzyme-linked immunosorbent assay and the recombinant A3-C1 domains in an immunoprecipitation assay, indicating that at least part of LE antibodies reacted with the FVIII domain encompassing the mutation site; and (5) LE IgG inhibited FVIII activity by decreasing the rate of FVIIIa release from vWF, but LE IgG recognized an epitope distinct from ESH8, a murine monoclonal antibody exhibiting the same property. We conclude that the present inhibitors are unique in that they clearly distinguish wild-type from self, mutated FVIII. The inhibition of wild-type FVIII by LE antibody is enhanced by vWF and is associated with an antibody-dependent reduced rate of FVIIIa release from vWF.- - - - - - - - - - ranking = 0.33333333333333keywords = plasma (Clic here for more details about this article) |
3/118. Postoperative use of rFVIIa by continuous infusion in a haemophilic boy.Continuous infusion of coagulation factor concentrates has proved to be safe and effective. Because rFVIIa (NovoSeven is a very expensive product and very frequent doses are needed, continuous infusion is expected to be highly cost-effective. The postoperative use of continuous infusion of rFVIIa in a haemophilic boy with a high titre FVIII inhibitor is reported. He presented with a large right knee haemarthrosis and was treated with intermittent doses of rFVIIa. After a transient improvement the haemarthrosis became worse and an open evacuation of the joint had to be made under treatment with bolus injections of rFVIIa for 3 days (120 microg kg(-1) every 2 h). A previous pharmacokinetic evaluation in this patient had showed that FVIIa recovery and half-life were less than expected. Continuous infusion of rFVIIa (20 microg kg(-1) h(-1)), with added low molecular heparin to prevent local thrombophlebitis, was started on the fourth postoperative day and maintained unchanged for 7 days. Four additional single bolus injections were given for early joint mobilization. The intervals between replacements of the pump syringes were progressively increased from 6 to 12 h and then up to 24 h. FVIIa plasma levels during continuous infusion ranged between 6.3 and 10.4 IU mL(-1). Although FVIIa assays seemed to show good stability, we observed the formation of precipitates inside the syringes. The precipitates seemed to contain FVIIa. We concluded that FVIIa plasma levels of 6-10 IU mL(-1) were safe and effective to prevent postoperative haemorrhage in this patient. The addition of heparin to the rFVIIa concentrates, however, may cause precipitation and should be avoided. Individual pharmacokinetic evaluation may be useful to select the appropriate initial doses, especially in young patients.- - - - - - - - - - ranking = 0.33333333333333keywords = plasma (Clic here for more details about this article) |
4/118. Orthotopic liver transplantation in a patient with severe haemophilia A and with advanced liver cirrhosis.A patient with severe haemophilia A underwent orthotopic liver transplantation because of changes correlated to end-stage liver cirrhosis due to hepatitis b, C and D infection. Replacement therapy was carried out for 4 days and the clinical course was uneventful. At the time of reporting the patient has a normal working life. FVIII plasma concentration is normal. The indirect hyperbilirubinaemia may be related to the Gilbert's anomaly of the donor.- - - - - - - - - - ranking = 0.16666666666667keywords = plasma (Clic here for more details about this article) |
5/118. Long-lasting remission and successful treatment of acquired factor viii inhibitors using cyclophosphamide in a patient with systemic lupus erythematosus.Acquired deficiency of clotting factor viii (FVIII) is a rare bleeding diathesis seldom encountered in systemic lupus erythematosus (SLE). Reduction of FVIII activity by autoantibodies can cause potentially life-threatening situations. Herein, an SLE patient with a positive lupus anticoagulant (LAC) test who abruptly developed metrorrhagia 4 yr after diagnosis is reported. Coagulation tests revealed FVIII activity reduced to 3% and a prolonged aPTT. FVIII inhibitor(s) were found to be as high as 3.0 Bethesda Units. plasmapheresis, immunoglobulins, prednisolone and FVIII plasma concentrates induced the cessation of metrorrhagia, but the clotting tests were barely improved. One month later, extensive ecchymosis appeared and worsened, despite re-administration of the previous therapy. pulse cyclophosphamide followed by oral administration was then started with normalization of coagulation parameters and long-lasting disease remission.- - - - - - - - - - ranking = 0.16666666666667keywords = plasma (Clic here for more details about this article) |
6/118. plasma exchange for acquired hemophilia: a case report.A patient with acquired hemophilia complicated with chronic renal failure and lung tuberculosis was successfully treated by consecutive plasma exchange (PE). A 71-year-old man with serious bleeding tendency showed low coagulation factor levels and a high titer of factor viii (FVIII) inhibitor, and he was diagnosed with acquired hemophilia. Because of the complication of active lung tuberculosis, instead of immunosuppressive therapy, he undertook a series of PE with fresh frozen plasma replacement for 3 months. After the start of PE, his bleeding symptoms and activated partial thromboplastin time (APTT) improved gradually according to the decrease in FVIII inhibitor levels. These results suggest that PE is an effective therapeutic tool for refractory acquired hemophilia.- - - - - - - - - - ranking = 0.33333333333333keywords = plasma (Clic here for more details about this article) |
7/118. A case of factor viii inhibitor-positive acquired hemophilia treated by plasmapheresis.We report on a case of factor viii inhibitor-positive acquired hemophilia in which combined therapy of plasma exchange (PE) and steroids was effective. The patient, a 68-year-old man, had undergone hemodialysis since April 1998, due to chronic renal failure caused by diabetic nephropathy. The hemostasis of blood access sites gradually became difficult after the initiation of dialysis and the prolongation of activated partial thromboplastin time (APTT) (74.5 s), and a decrease in factor viii (0.02%) and an abnormally high concentration of factor viii inhibitor (111 U/ml) were found. Under the diagnosis of factor viii inhibitor-positive acquired hemophilia, 3 consecutive PE were performed, followed by a large dose administration of gamma globulin. However, the effect of this therapy disappeared within 20 days. Then the PE therapy was performed again accompanied by pulse methylprednisolone therapy. After that, factor viii inhibitor was suppressed and the patient's hemostatic defect continued to improve even after the reduction of the steroid dose. These results suggest that PE is very effective in treating factor viii inhibitor-positive acquired hemophilia.- - - - - - - - - - ranking = 0.83333333333333keywords = plasma (Clic here for more details about this article) |
8/118. portal vein thrombosis in a patient with severe haemophilia A and F V G1691A mutation during continuous infusion of F VIII after intramural jejunal bleeding--successful thrombolysis under heparin therapy.We report on a 14-year-old boy with severe haemophilia A who developed a portal vein thrombosis during continuous infusion of F VIII. For treatment of a posttraumatic intramural jejunal haematoma with extension into the mesenterium the patient received continuous infusion (CI) of a high purity F VIII concentrate, starting with an initial bolus injection of 100 IU F VIII/kg bw and followed by 4-5 IU F VIII/kg bw/h i.v. F VIII plasma activity ranged between 47 and 88%. Resorption of the haematoma was proven by abdominal ultrasonic follow-ups. After 3 weeks of CI a thrombus formation in the portal vein was detected by ultrasound and confirmed by duplex ultrasound. Subsequent to diagnosis the patient was heparinised with unfractionated heparin (UFH 300-450 IU/kg/d i.v.). In order to induce further resorption of the haematoma. F VIII concentrate was given concomitantly (50 IU/kg bw twice daily) during the initial phase of treatment. After 14 days of anticoagulant therapy with UFH, the regimen was changed to low molecular weight heparin (LMWH; Fraxiparin 0.3; 2850 IU anti-X activity/d s.c.; bw 60 kg). F VIII dosage was gradually reduced with advanced resorption of the haematoma and thereafter switched to prophylaxis (40 IU/kg bw 3 times weekly). Complete lysis of the thrombus was observed after 6 months of treatment with UFH and LMWH respectively without any further complications. Thereafter LMWH was discontinued. Thrombophilic screening revealed no abnormalities except heterozygous F V G1691A. CONCLUSION: The coexistence of a common prothrombotic risk factor and haemophilia may cause severe complications, in particular if the bleeding disorder has to be corrected temporarily by administration of the concerning deficient agent.- - - - - - - - - - ranking = 0.16666666666667keywords = plasma (Clic here for more details about this article) |
9/118. Acquired hemophilia masked by warfarin therapy.People without hemophilia but with autoantibodies specifically directed against the procoagulant activity of factor viii are known to have acquired hemophilia. The bleeding diathesis in these patients is often severe and life-threatening. The definite laboratory diagnosis of this disorder includes demonstration of low factor viii levels in plasma with a high titer of factor viii inhibitors, but the initial suspicion for its presence should rise in view of a prolonged partial thromboblastin time (PTT) and a normal prothrombin time associated with an acquired bleeding disorder. Oral anticoagulant treatment is known to prolong PTT as well, and the merger of these 2 situations may cause delayed diagnosis of acquired hemophilia with devastating consequences. We describe here the first reported case of acquired hemophilia diagnosed in a patient treated with warfarin. In such patients prolonged PTT may be ascribed to warfarin therapy rather than to acquired hemophilia, thus causing a dangerous delay in diagnosis.- - - - - - - - - - ranking = 0.16666666666667keywords = plasma (Clic here for more details about this article) |
10/118. Acquired von Willebrand syndrome with inhibitors both to factor viii clotting activity and ristocetin-induced platelet aggregation.A case of acquired von Willebrand's syndrome (vWs) is described which appeared to be due to antibodies directed against factor viii clotting activity (FVIIIC), factor viii-related antigen (FVIIIRAg) and von willebrand factor. The antibodies directed against FVIIIRAg was demonstrated by the inhibitory effect of a platelet eluate on ristocetin-induced aggregation of normal platelets. This effect was not shown by the patient's platelet-poor plasma alone, nor could it be demonstrated in platelet eluates from 13 other patients who had antibodies to FVIIIC but in whom there was no evidence of an acquired vWs.- - - - - - - - - - ranking = 0.16666666666667keywords = plasma (Clic here for more details about this article) |
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