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Bleeding predictors in factor-XI-deficient patients.

Bleeding in factor-XI-deficient patients is mainly injury-related. Parameters influencing bleeding particularly in patients with minor factor XI deficiency have not been defined. We utilized a logistic regression model to analyze parameters influencing bleeding tendency in subjects from 45 families with factor XI deficiency. Bleeding manifestations were documented in 58% of 26 homozygous or doubly heterozygous factor-XI-deficient patients, in 20% of 46 heterozygous factor-XI-deficient patients and in 9% of 47 family members with a normal factor XI genotype. Odds ratios for bleeding in homozygotes or double heterozygotes were 13 and in heterozygotes 2.6 with 95% confidence intervals of 3.8-45 and 0.8-9.0, respectively. Bleeding correlated negatively with factor XI level (r = -0.36, P = 0.0001) with major factor XI deficiency being a strong predictor of bleeding (P = 0.011). Minor factor XI deficiency and blood group O slightly contributed to bleeding. Although factor VIII and factor XI levels were correlated (r = 0.48, P = 0.0001), levels of factor VIII and von Willebrand factor were not predictors of bleeding. Bleeding was more common following operative procedure involving mucosal membranes (P < 0.01). The designed model enabled prediction of bleeding manifestations with an overall accuracy of 78% and 82% in heterozygotes.

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