Von Willebrand Disease (VWD)

Von Willebrand disease (VWD) is the most common inherited bleeding disorder that affects the blood's ability to clot.

VWD is almost always inherited. This means it is passed from parents to children. People with the disorder may have low levels of a blood protein called von Willebrand factor. It helps the platelets in blood stick together to stop bleeding. Sometimes von Willebrand factor is in the blood but not working well. VWD may also cause problems with another clotting protein in the blood known as factor VIII. VWD is a lifelong disorder.

There are three main types of VWD:

• Type 1. This is the mildest and most common form. Your child has low levels of von Willebrand factor and may have low levels of factor VIII.
• Type 2. There are four subtypes of type 2 VWD. Each is treated differently. Your child has von Willebrand factor in the blood, but it doesn't work normally.
• Type 3. This is the most severe and rarest form. Your child has no von Willebrand factor and low levels of factor VIII. This type can cause serious bleeding in your child, from infancy into childhood.

The symptoms of VWD vary, depending on the type. Type 1 and type 2 symptoms generally include:

• Frequent or long-lasting nosebleeds.
• Frequent large bruises from minor bumps or injuries.
• Blood in the stool or urine.
• Heavy bleeding from cuts, dental work, or surgery.
• Heavy menstrual bleeding.

Children with type 3 VWD also have these symptoms. Severe bleeding can occur for no reason that can be life-threatening if not treated quickly. But they may also have severe bleeding in their muscles, joints, or other areas of the body. This bleeding causes pain and swelling. Because of these episodes, babies are often diagnosed during their first year.

Your child's health care provider will check your child for signs of bruising and bleeding. They will ask many questions about your child's symptoms and your family history. Samples of your child's blood will be taken to check:

• Complete blood count.  A complete blood count checks the red and white blood cells, blood clotting cells (platelets), and, sometimes, young red blood cells (reticulocytes). It includes hemoglobin and hematocrit and details about the red blood cells.
• Prothrombin time and partial thromboplastin time. Both of these tests check for bleeding and clotting problems. 
• Von Willebrand factor antigen and activity. These tests measure the amount and activity of von Willebrand factor in your child's blood. 
• Platelet function test.  This evaluates how well blood platelets are working.
• Factor VIII clotting activity.  This test determines the amount of factor VIII in the blood.

Long-term medicine is often not needed. If your child has repeated bleeding inside their body (for instance, in the joints), long-term medicine may be needed. Medicines may be used to stop bleeding if it happens They may also be used to prevent bleeding with planned surgery or dental work.

One medicine is desmopressin. It's a hormone that causes the body to release more von Willebrand factor into the bloodstream. It is given through an IV (intravenously) into your child's vein, or into your child's nose with a nasal spray. Another treatment is von Willebrand factor replacement therapy. Certain medicines may also be prescribed to prevent blood clots from being destroyed.

Menstruating girls with VWD may be treated with birth control pills. This can help control heavy menstrual bleeding.

Possible complications of VWD include:

• Severe bleeding with pain and swelling.
• Anemia or low levels of red blood cells or hemoglobin, the part of the blood that carries oxygen.
• Heavy menstrual periods.
• Problems with pregnancy.

You can take these steps to reduce your child's risk for bleeding:

• Don't give your child medicines such as aspirin and nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen. These can cause bleeding in children with VWD. Ask your child's health care provider for a list of medicines and supplements to stay away from.
• Discourage your child from taking part in certain contact or high-risk sports. Injuries may lead to bleeding. Talk with your child's health care provider about what sports and activities are safe.
• Have your child wear a medical identification (ID) bracelet at all times.
• Make all of your child's providers, dentists, school nurses, and pharmacists aware of your child's condition.
• Educate all caregivers, from teachers to sports coaches, about the disease and treatment in case of an emergency.

Call your child's health care provider if your child has bleeding that you can't stop. If your child has pain or swelling, call the provider right away.

• VWD is an inherited bleeding disorder that affects the blood's ability to clot.
• Most people with VWD have a mild form.
• VWD is diagnosed with blood tests.
• Medicines may be used to stop bleeding or to prevent bleeding with planned procedures.
• People with VWD should not take aspirin or NSAIDs.
• All caregivers should be educated about your child's condition and what to do in an emergency.

Tips to help you get the most from a visit to your child’s health care provider:

• Know the reason for the visit and what you want to happen.
• Before your visit, write down questions you want answered.
• At the visit, write down the name of a new diagnosis and any new medicines, treatments, or tests. Also write down any new instructions your provider gives you for your child.
• Know why a new medicine or treatment is prescribed and how it will help your child. Also know what the side effects are.
• Ask if your child’s condition can be treated in other ways.
• Know why a test or procedure is recommended and what the results could mean.
• Know what to expect if your child does not take the medicine or have the test or procedure.
• If your child has a follow-up appointment, write down the date, time, and purpose for that visit.
• Know how you can contact your child’s provider after office hours. This includes weekends and holidays. This is important if your child becomes ill and you have questions or need advice.