|Haemophilia, A Bleeding Disorder|
Causes of Haemophilia
Haemophilia is caused by a mutation or change, in one of the genes, that provides instructions for making the clotting factor proteins needed to form a blood clot. This change or mutation can prevent the clotting protein from working properly or to be missing altogether. These genes are located on the X chromosome. Males have one X and one Y chromosome (XY) and females have two X chromosomes (XX). Males inherit the X chromosome from their mothers and the Y chromosome from their fathers. Females inherit one X chromosome from each parent.
The X chromosome contains many genes that are not present on the Y chromosome. This means that males only have one copy of most of the genes on the X chromosome, whereas females have 2 copies. Thus, males can have a disease like haemophilia if they inherit an affected X chromosome that has a mutation in either the factor VIII or factor IX gene. Females can also have haemophilia, but this is much rarer. In such cases both X chromosomes are affected or one is affected and the other is missing or inactive. In these females, bleeding symptoms may be similar to males with haemophilia.
|Haemophilia Inheritance Illustration|
Even though haemophilia runs in families, some families have no prior history of family members with haemophilia. Sometimes, there are carrier females in the family, but no affected boys, just by chance. However, about one-third of the time, the baby with haemophilia is the first one in the family to be affected with a mutation in the gene for the clotting factor.
Haemophilia can result in:
• Bleeding within joints that can lead to chronic joint disease and pain
• Bleeding in the head and sometimes in the brain which can cause long term problems, such as seizures and paralysis
• Death can occur if the bleeding cannot be stopped or if it occurs in a vital organ such as the brain.
Key prevention messages from the National Haemophilia Foundation’s National Prevention Program
Do the 5 Tips for Healthy Living
1. Get an annual comprehensive checkup at a haemophilia treatment center.Types of Haemophilia
2. Get vaccinated-Hepatitis A and B are preventable.
3. Treat bleeds early and adequately.
4. Exercise and maintain a healthy weight to protect your joints.
5. Get tested regularly for blood-borne infections.
There are several different types of haemophilia. The following two are the most common:
• Haemophilia A (Classic Haemophilia)
This type is caused by a lack or decrease of clotting factor VIII.
• Haemophilia B (Christmas Disease)
This type is caused by a lack or decrease of clotting factor IX.
Signs and Symptoms of Haemophilia
Common signs of haemophilia include:
|An Illustration of Haemophilia Bleeds in a Child|
• Bleeding of the mouth and gums, and bleeding that is hard to stop after losing a tooth.
• Bleeding after circumcision (surgery performed on male babies to remove the hood of skin, called the foreskin, covering the head of the penis).
• Bleeding after having shots, such as vaccinations.
• Bleeding in the head of an infant after a difficult delivery.
• Blood in the urine or stool.
• Frequent and hard-to-stop nosebleeds.
Who is Affected?
Haemophilia occurs in about 1 of every 5,000 male births. Currently, about 20,000 males in the United States are living with the disorder. Haemophilia A is about four times as common as haemophilia B, and about half of those affected have the severe form. Haemophilia affects people from all racial and ethnic groups.
Diagnosis of Haemophilia
Many people who have or have had family members with haemophilia will ask that their baby boys get tested soon after birth.
About one-third of babies who are diagnosed with haemophilia have a new mutation not present in other family members. In these cases, a doctor might check for haemophilia if a newborn is showing certain signs of haemophilia.
To make a diagnosis, doctors would perform certain blood tests to show if the blood is clotting properly. If it does not, then they would do clotting factor tests, also called factor assays, to diagnose the cause of the bleeding disorder. These blood tests would show the type of haemophilia and the severity.
A Computer Generated Movie on Haemophilia
Treatment of Haemophilia
The best way to treat haemophilia is to replace the missing blood clotting factor so that the blood can clot properly. This is done by infusing (administering through a vein) commercially prepared factor concentrates. People with haemophilia can learn how to perform these infusions themselves so that they can stop bleeding episodes and, by performing the infusions on a regular basis (called prophylaxis), can even prevent most bleeding episodes.
Good quality medical care from doctors and nurses who know a lot about the disorder can help prevent some serious problems. Often the best choice for care is to visit a comprehensive Haemophilia Treatment Center (HTC). An HTC not only provides care to address all issues related to the disorder, but also provides health education that helps people with haemophilia stay healthy.
About 15-20 percent of people with haemophilia develop an antibody (called an inhibitor) that stops the clotting factors from being able to clot the blood and stop bleeding. Treatment of bleeding episodes becomes extremely difficult, and the cost of care for a person with an inhibitor can skyrocket because more clotting factor or a different type of clotting factor is needed. People with inhibitors often experience more joint disease and other problems from bleeding that result in a reduced quality of life.