Hemophilia C with Mild von Willebrand Disease or Low-Normal VWF Levels
In partial factor XI deficiency, a concurrent diagnosis of mild von Willebrand disease — or von Willebrand factor levels at the lower end of the normal range — can be a significant driver of bleeding and directly shapes which treatment is appropriate.
Clinical scenario
Partial factor XI (FXI) deficiency co-occurring with mild von Willebrand disease or with VWF levels towards the low-normal margin. This dual haemostatic impairment may explain a bleeding tendency that FXI levels alone do not fully account for.
Treatment approach (partial)
An infusion-based agent that can simultaneously raise FXI activity and improve VWF-related parameters may be applicable in this setting. The complete protocol — including selection criteria, regimen specifics, and monitoring — is available in full below.
Clinical goals: A meaningful rise in factor XI activity level (FXI:C) alongside a corresponding increase in FVIII:C and von Willebrand factor levels, confirming adequate haemostatic correction.
References
If some patients with partial FXI deficiency bleed because they have mild VWD or have VWF levels towards the lower end of the normal range, then DDAVP might be effective.
One group has reported success in two patients with previous bleeding histories who received DDAVP infusions before carpal tunnel surgery (baseline FXI:C levels of 34 and 39 U/dL, normal FVIII:C and VWF levels, and normal bleeding times).
The FXI:C levels rose by 15 to 20 U/dL and the FVIII:C and VWF levels rose considerably.
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