von Willebrand Disease Management
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Direct answer
Desmopressin remains first-line for type 1 von Willebrand disease — the commonest inherited bleeding disorder — given as 0.3 micrograms/kg with a documented test-dose response, supplemented by tranexamic acid for mucosal bleeding. Type 3 disease, and type 2 variants that respond poorly or worsen with desmopressin, require plasma-derived von Willebrand factor concentrate for surgical cover and significant bleeds. Classification drives therapy: type 1 is a partial quantitative deficiency, type 2 (subtypes 2A, 2B, 2M, 2N) is qualitative, and type 3 is near-complete absence with an autosomal recessive, severe phenotype. Diagnosis rests on the mucocutaneous bleeding history with prolonged bleeding time or PFA-100, reduced von Willebrand factor antigen and ristocetin cofactor activity, and ristocetin-induced platelet agglutination to sort the subtypes.
What you must remember
- Prevalence claim: the commonest inherited bleeding disorder, with type 1 accounting for the large majority of cases; inheritance is autosomal (dominant for types 1 and 2, recessive for type 3) — the contrast with X-linked haemophilia is a one-mark certainty.
- Bleeding phenotype: mucocutaneous — menorrhagia, epistaxis, dental extraction bleeding, postoperative oozing — rather than the deep joint and muscle haematomas of haemophilia.
- Laboratory panel: platelet count normal (except the thrombocytopenia of type 2B), prolonged PFA-100 or bleeding time, reduced factor VIII (von Willebrand factor carries it), low vWF antigen, low ristocetin cofactor activity, and ristocetin-induced platelet agglutination to discriminate.
- Subtype logic: 2A — reduced high-molecular-weight multimers with poor platelet adhesion; 2B — abnormal binding that spontaneously aggregates platelets, causing thrombocytopenia and hyperresponse to low-dose ristocetin; 2M — poor platelet binding without multimer loss; 2N — defective factor VIII binding that mimics mild haemophilia A.
- Treatment by type: type 1 (and some 2A) — desmopressin with a prior test response; type 2B, type 3 and non-responders — vWF-containing concentrate; tranexamic acid as near-universal adjunct for dental, nasal and menstrual bleeding.
- Avoidance list: antiplatelet drugs, and desmopressin in type 2B where it can worsen thrombocytopenia; watch hyponatraemia from repeated desmopressin doses (tachyphylaxis limits re-dosing to about every 24-48 hours).
- Acquired von Willebrand syndrome: from aortic stenosis (shear-mediated cleavage — Heyde syndrome with gastrointestinal angiodysplasia bleeding), hypothyroidism, monoclonal gammopathies and lymphoproliferative disease — treat the driver.
A typical exam case
A 16-year-old girl presents with menorrhagia and iron deficiency; her mother reports postpartum haemorrhage and lifelong easy bruising. The sequence: recognise the mucocutaneous pattern with a family history suggesting autosomal dominant transmission, then panel testing — PFA-100 prolonged, factor VIII mildly reduced, vWF antigen low, ristocetin cofactor low, ristocetin-induced platelet agglutination proportionate — concluding type 1. Management is layered: iron repletion, hormonal control of menstruation, tranexamic acid during menses, a documented desmopressin response for dental work and future childbirth, and a written avoidance of non-steroidal anti-inflammatory drugs. If the platelet count had been low with hyperresponse to low-concentration ristocetin, the answer flips to type 2B: no desmopressin, concentrate cover instead. The exam point is that one ristocetin result rewrites the entire prescription.
The exam pattern and the Indian setting
The MCQ machinery clusters on three discriminators: von Willebrand disease versus haemophilia (girl, mucosal bleeding, autosomal transmission, reduced factor VIII with low vWF), subtype 2B (thrombocytopenia plus ristocetin hyperresponse — the single most tested detail), and 2N masquerading as haemophilia A in a girl with a family history that does not fit X-linkage. The viva favourite is why blood group O lowers vWF levels and can mislabel normals as deficient — interpret antigen levels against blood-group-specific ranges. In the Indian setting, the disease is genuinely under-diagnosed in women: heavy menstrual bleeding is systematically labelled "dysfunctional uterine bleeding" in gynaecology clinics and treated hormonally while the underlying vWD stays unnamed, so the postgraduate asked to evaluate refractory menorrhagia should include a vWF panel. Access realities are stark but manageable: desmopressin is inexpensive and available, tranexamic acid costs a few rupees, and the diagnostic panel is achievable in teaching hospitals — it is vWF concentrate that is scarce, reserved for type 3 patients and major surgery in tertiary centres.
Frequently asked questions
Which is the commonest inherited bleeding disorder and its commonest type?
von Willebrand disease, with type 1 partial quantitative deficiency responsible for the majority of cases.
Which subtype shows thrombocytopenia and why is desmopressin avoided in it?
Type 2B — the abnormal vWF spontaneously binds platelets, and desmopressin can aggravate the thrombocytopenia; concentrate is used instead.
What distinguishes type 2N from mild haemophilia A?
Type 2N has defective factor VIII binding due to a vWF mutation, transmitted autosomally — suspected when a "haemophilia A" pattern appears in a girl or fails X-linked logic.
Which adjunct covers dental and menstrual bleeding in all types?
Tranexamic acid — oral or local — used alongside desmopressin or concentrate therapy.
What is Heyde syndrome?
Acquired von Willebrand disease from aortic stenosis, where high shear cleaves large multimers and unmasks gastrointestinal angiodysplasia bleeding; valve replacement resolves it.