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- W3122676832 abstract "Summary Acquired factor V inhibitor (AFVI) is an extremely rare disorder that may cause severe bleeding. To identify factors associated with bleeding risk in AFVI patients, a national, multicentre, retrospective study was made including all AFVI patients followed in 21 centres in France between 1988 and 2015. All patients had an isolated factor V (FV) deficiency <50% associated with inhibitor activity. Patients with constitutional FV deficiency and other causes of acquired coagulation FV deficiencies were excluded. The primary outcome was incident bleeding and factors associated with the primary outcome were identified. Thirty‐eight (74 [36–100] years, 42·1% females) patients with AFVI were analysed. Bleeding was reported in 18 (47·4%) patients at diagnosis and in three (7·9%) during follow‐up (7 [0·2–48.7] months). At diagnosis, FV was <10% in 31 (81·6%) patients. Bleeding at diagnosis was associated with a prolonged prothrombin time that strongly correlated with the AFVI level measured in plasma { r = 0·63, 95% confidence interval (CI) [0·36–0·80], P < 0·05}. Bleeding onset during follow‐up was associated with a slow AFVI clearance ( P < 0·001). The corresponding receiver operating characteristics curve showed that AFVI clearance was predictive of bleeding onset with an AFVI clearance of seven months with a sensitivity of 100% (95% CI: 29–100) and a specificity of 86% (95% CI: 57–98, P = 0·02). Kaplan–Meier analysis showed that AFVI clearance >7 months increased the risk of bleeding by 8 (95% CI: [0·67–97], P = 0·075). Prothrombin time at diagnosis and time for clearance of FV inhibitor during follow‐up are both associated with bleeding in patients with AFVI." @default.
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- W3122676832 date "2021-01-20" @default.
- W3122676832 modified "2023-10-03" @default.
- W3122676832 title "Acquired factor V inhibitor: a nation‐wide study of 38 patients" @default.
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- W3122676832 doi "https://doi.org/10.1111/bjh.17308" @default.
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