People with the condition will have difficulty forming blood clots. For example, if they cut themselves, it will take longer to stop bleeding.
It occurs in up to 1 percent of people in the United States. No cure is available, but treatment can help people with the condition lead otherwise healthy lives.
In this article, we look at the different types of von Willebrand’s disease, their symptoms, and ways to manage them.
Types
There are four main types of von Willebrand’s disease.Type 1
Type 1 is the most common. About 60–80 percent of people with von Willebrand’s disease have type 1.
Type 1 is characterized by low levels of vWF. Clotting factor VIII, another essential blood-clotting protein, may also be affected. The severity of type 1 can range from mild to severe, but it mostly presents as mild.
Type 2
Several subtypes might occur in type 2 von Willebrand’s disease, but a doctor will generally diagnose type 2 when the vWF does not work properly, rather than there being a lack of it.
Different gene mutations can cause type 2, and each will require different treatment. Knowing the type 2 subtype can help a doctor shape treatment in a way that works best for the individual.
Type 2 is present in around 15–30 percent of people who have von Willebrand’s disease.
Type 3
In type 3, the individual typically has little to no vWF at all. This is the rarest and most severe form of von Willebrand’s disease.
Around 5–10 percent of people with the condition have type 3.
Acquired
While the more common types of von Willebrand’s disease are inherited, it is also possible to develop the condition from an autoimmune disease such as lupus or cancer, or as a result of taking some medications.
This is called acquired von Willebrand’s disease.
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Symptoms
Signs and symptoms may be mild and difficult to observe, or they may occur in a range of ways. It is difficult for doctors to diagnose milder forms of von Willebrand’s disease.When symptoms do appear, they tend to include bruising and extended or excessive bleeding. Bleeding might occur around the mucous membranes, including the gastrointestinal tract.
Symptoms of bleeding include:
- nosebleeds, which may be prolonged, recurring, or both
- bleeding from the gums
- longer, heavier menstrual bleeding
- excessive bleeding from a cut
- excessive bleeding after a tooth extraction or other dental work
- bruising, sometimes with lumps forming under the skin
Women may notice the following signs when menstruating:
- blood clots that are at least 1 inch in diameter
- soaking through at least two tampons or pads in 2 hours
- a need for double sanitary protection to control bleeding
- menstruation that continues for over a week
- symptoms of anemia, including fatigue, pallor, and drowsiness
Risk factors and causes
When injury occurs in a blood vessel, small fragments inside a type of blood cell called platelets normally clump together to plug the wound and stem the bleeding.vWF, which carries clotting factor VIII, helps platelets stick together to form a clot. Clotting factor VIII is either missing or faulty in people with the most common form of hemophilia.
Family history is the most common risk factor for von Willebrand’s disease. That said, the genetic content needed for each type to develop will differ.
For example, in types 1 and 2, only one gene is necessary to cause the condition. Also, the biological parents will likely have von Willebrand’s disease themselves.
In type 3, both parents need to pass on genes, and they will most likely be carrying the disease without actually having it.
Acquired von Willebrand’s disease can happen later in life, so advanced age is a factor.
Diagnosis
blood testBlood tests can give a clear picture of how the blood clots.
Early diagnosis and treatment significantly increase the chances of living a normal and active life with von Willebrand’s disease.
Some people with type 1 or type 2 may not experience major bleeding problems. Therefore, they may not receive a diagnosis until they have surgery or a serious injury.
The diagnosis of type 3 usually occurs at an early age, because major bleeding will probably occur at some time during infancy or childhood.
A doctor will look at the person’s medical history, carry out a physical exam, and run some diagnostic tests.
When assessing medical history, the doctor may ask whether the person has ever experienced the following symptoms:
- excessive bleeding after surgery or a dental procedure
- unexpected or easy bruising, or bruising with a lump underneath
- blood in the feces
- bleeding in the joints or muscles
- bleeding after taking medications, such as aspirin, nonsteroidal anti-inflammatory drugs (NSAIDs), or blood thinners
- abnormal blood platelet counts
- unexplainable nosebleeds that last for longer than 10 minutes, even after placing pressure on the nose
- frequent nosebleeds
- heavy menstrual bleeding for longer than a week, with clots
- kidney, liver, blood, or bone marrow disease
Blood tests can assess:
vWF levels
the structure of vWF and its multimers, or protein complexes, as well as how its molecules break down, to determine the type of von Willebrand’s disease
ristocetin cofactor activity, to reveal how well vWF works and whether it is adequately clotting the blood
factor VIII clotting activity, to establish levels of factor VIII
platelet function
bleeding time, to see how long it takes for a small wound to stop bleeding
It may take 2–3 weeks for the test results to come back, and some tests may need repeating to confirm a diagnosis. The doctor may refer the individual to a hematologist, a doctor who specializes in diseases of the blood.
Treatment
No cure is currently available for von Willebrand’s disease, but some options can prevent or stop bleeding episodes. Treatment tends to take the form of medication.Symptoms are normally mild, and treatment for people with milder symptoms is only necessary during surgery, dental work, or after an accident or injury.
Management methods depend on the type and severity of the condition, as well as the person’s response to therapy.
Medications can:
- release more vWF and factor VIII into the bloodstream
- control heavy menstruation
- prevent the breakdown of blood clots
- replace missing vWF
A doctor will usually prescribe this for those with types 1 and 2. They may use the nasal spray at the beginning of a menstrual period or before minor surgery.
If DDAVP is not sufficient, the doctor might prescribe doses of concentrated blood-clotting factors containing vWF and factor VIII for all three types of von Willebrand’s disease.
Oral contraceptives, specifically birth control pills containing estrogen, can help women with heavy periods.
Clot-stabilizing medications delay the breakdown of clotting factors. A doctor may call these antifibrinolytic drugs. They help keep a clot in place once it forms, especially during surgery or dental work.
A doctor may also apply fibrin sealant to a wound to stop the bleeding. This is a glue-like substance
Complications
vWF and factor VIII levels tend to rise during pregnancy, but bleeding complications might occur during delivery. Bleeding may be heavier and last longer after giving birth.Women who have a type of von Willebrand’s disease should consult a hematologist and specialized obstetrician when they become pregnant.
They will likely carry out blood tests during the final trimester of pregnancy.
Q:
What is the difference between von Willebrand’s disease and hemophilia?
A:
While von Willebrand’s disease and hemophilia are both genetic and cause problems with blood clotting, they are distinctly different conditions.
Von Willebrand’s disease is usually milder than hemophilia and is more common. It affects males and females equally, while hemophilia almost always affects males.
Hemophilia causes low levels of clotting factors that are different than the vWF involved in von Willebrand’s disease.
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