The Association of Aging With Von Willebrand Factor Levels and Bleeding Risk in Type 1 Von Willebrand Disease.

Little is known about aging in von Willebrand disease (VWD). It is uncertain whether VWD patients experience an age-related increase in von Willebrand factor (VWF) levels, and if so, it is unknown whether normalization of VWF levels with aging ameliorates bleeding risk. We aimed to determine the association of age with VWF levels and bleeding risk in patients with type 1 VWD. This is a retrospective chart review of patients with type 1 VWD presenting to the Hemophilia Clinic of Western Pennsylvania for regularly scheduled clinic visits. Data collected included VWF antigen level and condensed molecular and clinical markers for the diagnosis and management of Type 1 (MCMDM-1) VWD bleeding assessment tool (BAT) bleeding score based on bleeding symptoms during the previous 3 years. Thirty-nine patients participated in the study, and 32 were female. The average age of participants was 41.8 ± 18.0 years. The mean VWF antigen level was 0.83 ± 0.37 IU/mL, and the mean bleeding score was 2.51 ± 2.90. The bleeding score was inversely associated with age, β = -0.080 (SE = 0.023), P < .01. There was a nonsignificant association between VWF antigen levels and age. To our knowledge, this is the first report showing an association between aging and decreased bleeding symptoms in patients with type 1 VWD. Determining whether or not bleeding risk is reduced in older patients with type 1 VWD is essential for optimal clinical management. Moreover, VWF concentrate is costly, and unwarranted use represents a significant waste of health-care dollars. These findings warrant further investigation.