When should von Willebrand disease be suspected in a patient with intracerebral hemorrhage?

When to Suspect von Willebrand Disease in Intracerebral Hemorrhage

Suspect von Willebrand disease (VWD) in patients with intracerebral hemorrhage (ICH) when there is a personal or family history of mucocutaneous bleeding, particularly in children with trauma-related ICH or adults with spontaneous ICH, especially if routine coagulation screening shows a prolonged aPTT.

Clinical Scenarios Warranting VWD Suspicion

High-Risk Presentations

Type 3 VWD is the primary concern in ICH cases, as it carries the highest risk among VWD subtypes 1, 2. However, ICH can occur across the VWD spectrum:

• Type 3 VWD: Most susceptible to ICH 1
• Type 1 VWD: Can present with ICH, though less common 2
• Type 2 variants: Rare but documented cases, including type 2N 2

Age-Specific Patterns

• Children: Predominantly trauma-related ICH 3, 2
• Adults: More likely spontaneous ICH 3

Key Clinical Indicators

Bleeding History Assessment

Use structured bleeding assessment tools (BATs) to quantify bleeding symptoms 4:

• ISTH-BAT abnormal scores: ≥6 in adult females, ≥4 in adult males, ≥3 in children 4
• Mucocutaneous bleeding patterns: Easy bruising, epistaxis, menorrhagia, prolonged bleeding from minor cuts
• BATs distinguish VWD from no bleeding disorder but cannot differentiate VWD from other platelet function defects 4

Neurological Symptoms in ICH with VWD

In the pediatric VWD cohort with confirmed ICH, all six children demonstrated 2:

• Vomiting (100% of cases)
• Headache, irritability, lethargy, or altered consciousness

Critical pitfall: Two of six ICH cases were only confirmed on a second CT scan 2, emphasizing the need for repeat imaging if clinical suspicion persists despite initial negative imaging.

Family History Red Flags

• Type 1 VWD: Autosomal dominant inheritance—expect one affected parent, though de novo variants occur 4
• Type 3 VWD: Autosomal recessive—parents may be asymptomatic carriers or have low VWF with mild bleeding 4
• Incomplete penetrance complicates family history in type 1 VWD 4

Laboratory Screening Approach

Initial Coagulation Screen

Perform baseline testing within 72 hours of presentation 5:

• Complete blood count
• PT, aPTT, fibrinogen

Key finding: In a cohort of children with intracranial hemorrhage, all three patients with inherited bleeding disorders (including one with VWD) had prolonged aPTT on initial testing 5. However, routine screening tests can be entirely normal in mild VWD 4.

When Screening is Normal but Suspicion Remains

If all screening tests are normal and VWD is suspected, proceed directly to specific factor assays 4. Do not rely on:

• Bleeding time: Poor reproducibility, low sensitivity 4
• PFA-100/200: Useful for severe VWD but insensitive for mild cases 4

Definitive VWD Testing

No single test diagnoses VWD—require multiple assays 4:

1. VWF antigen (VWF:Ag): Quantifies total VWF protein
2. VWF activity assay: Measures platelet-binding function
   • Prefer newer assays (VWF:GPIbM or VWF:GPIbR) over VWF:RCo 4
   • VWF:RCo has poor reproducibility and false-low results in African Americans (D1472H variant in ~63%) 4

Risk Stratification for ICH in VWD

Severity-Based Risk

More severe VWD = higher ICH risk 1:

• Type 3 VWD: Highest risk
• Afibrinogenemia, FXIII, FX, FVII deficiencies: High risk
• Type 1 VWD: Lower but documented risk

Trauma and Activity Considerations

• Stressful delivery (prolonged labor, vacuum extraction): Avoid in known VWD 1
• Contact sports: Increase ICH risk 1, 3
• Head trauma in known VWD: Lower threshold for CT imaging 2

Diagnostic Algorithm for ICH Patients

1. Obtain bleeding history using ISTH-BAT if time permits
2. Check family history of bleeding disorders
3. Initial labs: CBC, PT, aPTT, fibrinogen within 72 hours
4. If aPTT prolonged OR strong clinical suspicion: Proceed to VWF-specific testing (VWF:Ag, VWF activity)
5. If initial CT negative but symptoms persist: Repeat imaging 2
6. Consider VWD even with normal screening tests in patients with suggestive bleeding history

Management Implications

Once VWD is diagnosed in the context of ICH:

• Type 3 VWD with ICH: Consider long-term prophylaxis 2
• Perioperative management: Factor VIII/VWF concentrate administration 6, 7
• Avoid antiplatelet therapy when possible in endovascular procedures 7

Common Pitfalls

• Assuming normal screening tests exclude VWD: Mild VWD frequently has normal PT, aPTT, and platelet counts 4
• Single CT scan ruling out ICH: Repeat imaging if clinical symptoms persist 2
• Overlooking type 1 VWD: While less common than type 3, it can still cause ICH 2
• Using VWF:RCo assay: Inferior to newer VWF:GPIbM/GPIbR assays, particularly in African American patients 4