OBJECTIVE: Von Willebrand disease (vWD) was thought to be a rare disorder until a recent survey reported a prevalence of 0.8% in an ethnically homogenous community in northern Italy. The purpose of this study was to determine the prevalence of vWD in an ethnically heterogenous population. METHODS: Von Willebrand factor (vWF) was measured by the ristocetin cofactor method in 600 healthy children, aged 2 to 18 years, seen for routine school physical examinations in a three-state region. Personal and family bleeding symptoms were determined by questionnaire. The diagnosis of vWD required a personal history of bleeding symptoms, an abnormal vWF activity concentration, and a family history of at least one immediate family member with bleeding symptoms. RESULTS: A total of 315 subjects were white, 212 were black, 16 were Hispanic, 10 were from other groups, and 47 were biracial. Eight subjects (four black, four white) met the criteria for vWD, for a prevalence of 1.3%. Seven subjects with vWD had blood group O (mean vWF = 32 U/dl; range, 10 to 42 U/dl), and one had blood group A (vWF = 41 U/dl). Children who had blood group O had significantly (p < 0.001) lower vWF activities (median, 83 U/dl, range, 43 to 162 U/dl) than those from non-O blood groups (median, 98 U/dl; range, 51 to 190 U/dl). There were no significant differences in vWF activity by ethnicity. The vWF activity was significantly (p < 0.02) greater for boys than girls in both blood groups. CONCLUSION: Von Willebrand disease is the most common congenital hemostatic disorder; its high prevalence is not limited to one ethnic group.
OBJECTIVE:Von Willebrand disease (vWD) was thought to be a rare disorder until a recent survey reported a prevalence of 0.8% in an ethnically homogenous community in northern Italy. The purpose of this study was to determine the prevalence of vWD in an ethnically heterogenous population. METHODS:Von Willebrand factor (vWF) was measured by the ristocetin cofactor method in 600 healthy children, aged 2 to 18 years, seen for routine school physical examinations in a three-state region. Personal and family bleeding symptoms were determined by questionnaire. The diagnosis of vWD required a personal history of bleeding symptoms, an abnormal vWF activity concentration, and a family history of at least one immediate family member with bleeding symptoms. RESULTS: A total of 315 subjects were white, 212 were black, 16 were Hispanic, 10 were from other groups, and 47 were biracial. Eight subjects (four black, four white) met the criteria for vWD, for a prevalence of 1.3%. Seven subjects with vWD had blood group O (mean vWF = 32 U/dl; range, 10 to 42 U/dl), and one had blood group A (vWF = 41 U/dl). Children who had blood group O had significantly (p < 0.001) lower vWF activities (median, 83 U/dl, range, 43 to 162 U/dl) than those from non-O blood groups (median, 98 U/dl; range, 51 to 190 U/dl). There were no significant differences in vWF activity by ethnicity. The vWF activity was significantly (p < 0.02) greater for boys than girls in both blood groups. CONCLUSION:Von Willebrand disease is the most common congenital hemostatic disorder; its high prevalence is not limited to one ethnic group.
Authors: Robert G Pergolizzi; Guangchun Jin; Diane Chan; Lorraine Pierre; James Bussel; Barbara Ferris; Philip L Leopold; Ronald G Crystal Journal: Blood Date: 2006-04-25 Impact factor: 22.113
Authors: Daniel B Bellissimo; Pamela A Christopherson; Veronica H Flood; Joan Cox Gill; Kenneth D Friedman; Sandra L Haberichter; Amy D Shapiro; Thomas C Abshire; Cindy Leissinger; W Keith Hoots; Jeanne M Lusher; Margaret V Ragni; Robert R Montgomery Journal: Blood Date: 2011-12-23 Impact factor: 22.113
Authors: Veronica H Flood; Joan Cox Gill; Kenneth D Friedman; Daniel B Bellissimo; Sandra L Haberichter; Robert R Montgomery Journal: Semin Thromb Hemost Date: 2011-11-18 Impact factor: 4.180
Authors: Mohamad A Kalot; Mohammed Al-Khatib; Nathan T Connell; Veronica Flood; Romina Brignardello-Petersen; Paula James; Reem A Mustafa Journal: Haemophilia Date: 2019-11-26 Impact factor: 4.287
Authors: Veronica H Flood; Pamela A Christopherson; Joan Cox Gill; Kenneth D Friedman; Sandra L Haberichter; Daniel B Bellissimo; Rupa A Udani; Mahua Dasgupta; Raymond G Hoffmann; Margaret V Ragni; Amy D Shapiro; Jeanne M Lusher; Steven R Lentz; Thomas C Abshire; Cindy Leissinger; W Keith Hoots; Marilyn J Manco-Johnson; Ralph A Gruppo; Lisa N Boggio; Kate T Montgomery; Anne C Goodeve; Paula D James; David Lillicrap; Ian R Peake; Robert R Montgomery Journal: Blood Date: 2016-02-09 Impact factor: 22.113
Authors: Jonathan C Roberts; Patti A Morateck; Pamela A Christopherson; Ke Yan; Raymond G Hoffmann; Joan Cox Gill; Robert R Montgomery Journal: Blood Date: 2016-02-25 Impact factor: 22.113
Authors: Heidi L Lemmerhirt; Jordan A Shavit; Gallia G Levy; Suzanne M Cole; Jeffrey C Long; David Ginsburg Journal: Blood Date: 2006-07-27 Impact factor: 22.113