In this episode, we explore the comprehensive 2021 clinical practice guidelines for Von Willebrand disease (VWD), the most common inherited bleeding disorder, developed by the American Society of Hematology (ASH), the International Society on Thrombosis and Haemostasis (ISTH), the National Hemophilia Foundation (NHF), and the World Federation of Hemophilia (WFH). We examine the shift in diagnostic protocols, specifically the recommendation to use newer platelet-binding assays (such as VWF:GPIbM or VWF:GPIbR) over the traditional ristocetin cofactor assay (VWF:RCo) to reduce variability and diagnostic error.
We discuss critical diagnostic thresholds, noting that while a VWF level of <0.30 IU/mL confirms VWD, patients with levels between 0.30 and 0.50 IU/mL are classified as having VWD only if they present with abnormal bleeding; otherwise, they are designated as having 'Low VWF'. The episode details the pathophysiology of the three main VWD types—partial quantitative deficiency (Type 1), qualitative defects (Type 2A, 2B, 2M, 2N), and total deficiency (Type 3)—and the role of genetic testing in differentiating subtypes.
Turning to management, we review the guidelines’ conditional recommendation for long-term prophylaxis in patients with severe, frequent bleeding and the use of desmopressin trials for Type 1 VWD, while noting desmopressin is generally contraindicated for Type 2B and ineffective for Type 3. We highlight specific care pathways for women, who face unique challenges such as heavy menstrual bleeding and postpartum haemorrhage, including the suggested use of tranexamic acid and hormonal therapies. Finally, we touch upon the psychosocial burden of the disease and emerging therapies, such as the expanded approval of recombinant VWF (Vonvendi) and the investigational subcutaneous therapy VGA039.