P. AngchaisuksiriV. AtichartakarnK. PathepchotiwongS. JootarA. UngkanontS. ChuncharuneeMahidol University2018-08-102018-08-101993-12-01The Southeast Asian journal of tropical medicine and public health. Vol.24 Suppl 1, (1993), 152-158012515622-s2.0-0027901572https://repository.li.mahidol.ac.th/handle/20.500.14594/22642Eleven cases of acquired inhibitors against factor VIII: C and von Willebrand's factor (vWF) seen at the Department of Medicine, Ramathibodi Hospital from 1979 to 1991 were reviewed. Factor VIII: C inhibitor was found in 6 of 36 patients (17%) with hemophilia A (median age 18 years). Three patients each were weak (titer < 10 Bethesda units/ml), and strong antibody producers. Two cases of weak antibody producers had spontaneous disappearance of inhibitor, while all 3 strong antibody producers required specific treatment (corticosteroids, immunosuppressive drugs, and plasmapheresis). The inhibitor level temporarily declined in 2 patients, and disappeared in one. Spontaneous acquired inhibitor to factor VIII: C was seen in 3 patients. One each respectively had pemphigus vulgaris and bullous pemphigoid, autoimmune disease, and NIDDM. They were characterized by older age (median age 54 years), frequent skin and soft-tissue hematoma, but less hemarthroses. Inhibitor titer ranged from 15-280 Bethesda units/ml. Disappearance of the inhibitor after treatment with corticosteroids and immunosuppressive drugs were observed in all patients. Acquired von Willebrand's disease developed in 2 previously healthy patients. One patient was in the postpartum period, while the other had simultaneous acute viral hepatitis A infection. Both presented with the recent onset of spontaneous severe gingival bleeding, and demonstrated a prolonged bleeding time, reduced vWF:Ag (F VIIIR:Ag), and ristocetin cofactor (F VIIIR:vWF). Treatment with cryoprecipitate and corticosteroid resulted in remission of bleeding symptoms. Despite the rarity of these disorders, the recognition and proper management are of importance.Mahidol UniversityMedicineArticleSCOPUS