AI Article Synopsis

  • The patient, a 30-year-old woman, developed inhibitors after starting prophylaxis for bleeding, with genetic testing revealing two new mutations linked to her condition.
  • For the surgery, a combination of traditional and recombinant factor replacement therapies was used, effectively controlling bleeding without allergic reactions, but more research is needed for optimization.

Article Abstract

Type 3 von Willebrand disease (VWD), a rare and severe subtype, can produce inhibitors in roughly 5% to 10% of cases. We present a case of type 3 VWD with inhibitors in late pregnancy, which was successfully managed with a combination of neutralization and factor (F)VIII replacement during cesarean delivery. The patient, a 30-year-old woman, had no history of inhibitors despite over 100 exposures to VWF/FVIII. She developed inhibitors after 28 weeks of weekly pd VWF/FVIII prophylaxis for recurrent urolithiasis-associated hematuria during pregnancy. Genetic analysis detected two novel frameshift mutations: VWF Exon7 c.777_784dup and Exon14 c.1625_1646del. Titers of inhibitors to factors VIII and VWF using the Bethesda assay were 1.2 and 1.1 BU/mL, respectively. Pharmacokinetics revealed significantly low in vivo recovery of FVIII:C and VWF:Rcof and shortened half-life. During cesarean delivery, a combination of bolus pd VWF/FVIII once daily for neutralizing inhibitors plus continuous infusion of recombinant FVIII Fc fusion protein resulted in minimal bleeding without allergic reactions. Both VWF:Rcof and FVIII:C levels increased transiently during the 7-h of combination therapy without thrombotic events. In conclusion, combination therapy with neutralization and continuous FVIII replacement was effective for hemostasis with a low VWD inhibitor titer, though further optimization is required.

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http://dx.doi.org/10.1007/s12185-022-03372-2DOI Listing

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