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Bleeding Disorders

Health NewsBleeding disorders have been around for thousands of years. According to the National Hemophilia Foundation (NHF), they were mentioned as early as the second century AD in the Talmud, a collection of Jewish Rabbinical writings. When someone has a bleeding disorder, NHF says they usually have a defect in their blood vessels, or abnormalities in the blood itself. For most of us, tiny cells in our blood, called platelets, work together around an injury to help form a clot over the wound. This, according to NHF, happens within seconds of the injury. In people with bleeding disorders, problems with the platelets and/or the lack of certain clotting factors can cause sufferers to bleed for a longer period of time. The cause can be the result of inherited factors, as is the case with hemophilia or von Willebrand Disease (see below) but there can be non-genetic causes too. (Read about "Genetics")

Non-genetic causes

For example, hemolytic uremic syndrome (HUS) is characterized by destruction of red blood cells, damage to the lining of blood vessel walls, low platelet count and, in severe cases, kidney failure. (Read about "Kidney Disease") Most cases of HUS occur after an infection in the digestive system caused by the Escherichia coli bacterium found on contaminated food like meat, dairy products and juice. (Read about "E. Coli" "Food Safety") The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) says 90 percent of children with HUS who receive careful supportive care survive past the initial stages of the condition, and most of those will have no long-term effects. Immune Thrombocytopenic Purpura (ITP) is another disorder of the blood. Antibodies, part of the immune system (Read about "The Immune System"), attach to blood platelets and cause their destruction. Thrombocytopenia refers to the condition in which there are not enough platelets, leading to easy bruising and excessive bleeding. Purpura refers to the purplish- looking areas of the skin and mucous membranes (such as the lining of the mouth) where bleeding has occurred as a result of decreased platelets. NIDDK says some cases of ITP are caused by drugs and others are associated with infection, pregnancy or immune disorders such as systemic lupus erythematosus. (Read about "Lupus") About half of all cases are classified as "idiopathic," meaning the cause is unknown.

Other non-genetic factors listed by NHF include some of the following as reasons for bleeding disorders:

Bleeding problems can range from mild to severe, depending upon the reason and how soon treatment begins.

Genetic causes

The three main types of bleeding disorders with a genetic connection are:

Hemophilia, according to NHF, is a bleeding disorder caused by a lack of one of the blood clotting factors. Hemophilia has often been called the "Royal Disease". It is genetic in nature, being passed to sons by a mother who is a carrier of the defective gene. Queen Victoria, who ruled England from 1837 to 1901, passed the gene on to her daughters who then married into various European royal families.

One of Victoria's sons had hemophilia and died of a brain hemorrhage (Read about "Stroke") at the age of 31. Through a granddaughter of Victoria, the only son of the last Russian Czar was hemophilic.

The National Heart Lung and Blood Institute (NHLBI) estimates that there are about 20,000 hemophiliacs in the United States. It is thought that about 400 children are born each year with the condition.

Hemophilia A

Hemophilia A is a hereditary disorder with a deficiency in the clotting factor VIII. The end result is excessive and prolonged bleeding.

NHF says hemophilia A is the most common form of hemophilia:

Genetics

Hemophilia A, according to NHF, is caused by a defective gene. Mothers are the carriers of the disease. About half of the male children of female carriers have the disease and half of the female children of female carriers will be carriers. All female children of fathers with the disease are carriers of the trait, according to NHF. People with no family history (Read about "Family Health History") can also develop hemophilia A. NHF says this accounts for a third of all cases. It usually happens after a new or spontaneous gene mutation.

Symptoms

The severity of hemophilia A symptoms depends on the type of gene abnormalities and how it affects the activity of factor VIII. People whose clotting activity is 5 percent of normal may have mild hemophilia. While they may rarely have bleeding episodes, NHF says surgery or injury may lead to uncontrolled bleeding which can be deadly.

NHF says symptoms of hemophilia A include:

NHF says recurring bleeding into joints and muscles can cause crippling deformities. Bleeding can also swell the base of the tongue and block the airway. Even a slight bump on the head can trigger substantial bleeding causing brain damage and even death. (Read about "Head Injury")

Diagnosis

According to NHF, people with hemophilia A will usually experience their first bleeding episode before they are 18 months old. A doctor may suspect the disease in a child with unusual bleeding. Often, the diagnosis is made when an infant bleeds excessively following his circumcision. (Read about "Circumcision") Blood tests can determine whether clotting is slow. The severity of the disease can be determined by measuring the percentage of factor VIII activity in the blood. (Read about "Laboratory Testing")

Treatment

Thanks to advances over the last 35 years, NHLBI says people with hemophilia can lead a somewhat normal lifestyle with a normal life span. Hemophilia can now be treated by infusing the missing clotting factor. In the 1970's factor VIII concentrate products allowed people with hemophilia A to have home treatment, according to NHLBI. The introduction of these products also largely put an end to the need for transfusion of whole blood or plasma in the hospital.

NHF recommends hepatitis B vaccine (Read about "Hepatitis B") because of the increase risk of exposure to hepatitis from frequent infusions of blood products. (Read about "Infusion Therapy") The threat of being infected with HIV (Read about HIV in "HIV / AIDS") has also diminished over the last two decades according to NHF, thanks to better screening of donated blood. (Read about "Blood Donation Guidelines") In the past, NHF says mild hemophilia A could also be treated with an infusion of cryoprecipitate or desmopressin acetate (DDAVAP). The drugs would release the factor VIII that the body has stored in the lining of its blood vessels. Today experts may recommend desmopressin injection or nasal spray.

Hemophilia B

Hemophilia B, according to NHF, is caused by the deficiency of a blood clotting factor known as factor IX. The disease is also known as Christmas disease; named after Stephen Christmas, a British boy first diagnosed with the disorder. According to NHF, hemophilia B is:

Small wounds and injuries are not usually a problem for sufferers of hemophilia B. However, uncontrolled internal bleeding can lead to permanent damage to joints and muscles, according to NHF.

Genetics

Just like hemophilia A, hemophilia B is transmitted through the mother who is the carrier of an inherited sex-linked recessive trait with the defective gene on the X chromosome. (Read about "Genetics") Half of the male children of women who carry the trait will have the disease, and half of the female offspring of female carriers will be carriers, according to NHF. All female children of a father with hemophilia B will be carriers. Male children of a father with hemophilia B will be completely unaffected.

Symptoms

The severity of the symptoms of hemophilia B depends on how the activity of factor IX is affected, according to NHF. Severe forms of the disease will usually be evident early. Prolonged bleeding typically is noticed when an infant is circumcised. Mild cases, NHF says, may go unnoticed until later in life, perhaps after a surgery or trauma. Symptoms according to NHF include:

Diagnosis

A child whose bleeding is unusual can undergo blood tests to find out if their clotting ability is unusually slow (Read about "Laboratory Testing"), according to NHF. If that is the case, a doctor can determine whether the disease is hemophilia B and how the activity of factor IX is affected.

Treatment

Infusing the missing clotting factor is the key to treating people with hemophilia B, according to NHF. The amount depends on a number of factors including:

NHF says the hepatitis B vaccine is recommended for people with hemophilia B because of exposure to blood products. However, advances over the last 20 years in screening blood donors have increased the safety of blood products used to treat hemophilia, according to NHLBI.

Plasma and plasma concentrates contain clotting factors and many can be used by patients in their own homes. To prevent any crisis, NHF says factor IX concentrates can be used at home at the first signs of bleeding. People with severe forms of the disease may need as many as three infusions a week. (Read about "Infusion Therapy")

Cautions

NHF recommends that people with hemophilia avoid situations that might provoke bleeding. They also need to avoid certain drugs that can aggravate bleeding such as:

von Willebrand Disease

Named for the Finnish physician who first described the bleeding disorder, von Willebrand disease is a hereditary deficiency of the von Willebrand factor in the blood. The factor, according to NHF, is a protein that affects platelet function. Platelets are tiny particles in the blood that join together at an injury to prepare for a blood clot, according to NHF. When there is too little von Willebrand factor or the factor is abnormal, the platelets don't gather properly. The end result is bleeding that doesn't stop as quickly as it should, although it usually stops at some point. According to NHF, von Willebrand disease:

Variations of von Willebrand Disease

According to NHF there are many variations of von Willebrand disease including:

Symptoms

NHF says von Willebrand disease can be traced through a family's history. (Read about "Family Health History") Some members of a family will have symptoms while others may just be carriers of the gene. Symptoms are as follows according to NHF:

Diagnosis

NHF says diagnosing von Willebrand disease can be somewhat challenging. Usually someone who has the disease has a parent who had bleeding problems. When a physician hears of the symptoms of von Willebrand disease, like nosebleeds, and easy bruising, NHF recommends that testing be done to determine whether it's von Willebrand disease. Testing may help discover if the number of platelets is normal but bleeding time is prolonged.

Treatment

People with von Willebrand disease have many choices when it comes to treating their disorder, according to NHF. Some people may never need any treatment. Others can turn to infusions (Read about "Infusion Therapy") or even a nasal spray to deal with symptoms and prevention.

The National Hemophilia Foundation's Medical and Scientific Advisory Council (MASAC) recommends the following:

NHF says surgery is always a risk for people with the disease, as is menstruation, pregnancy and childbirth for women diagnosed with von Willebrand disease. (Read about "Childbirth" "Healthy Pregnancy") Hemorrhage could occur. Using aspirin and any nonsteroidal anti-inflammatory can make matters worse, according to NHF.

Future for bleeding disorders

While treatments for bleeding disorders have become safer over the last 30 years, there is still no cure for disorders like hemophilia and von Willebrand disease. According to NHLBI, gene therapy would be the next major advance in treating bleeding disorders. Studies continue on different viral and non-viral gene transfer methods for the delivery of the factor VIII and factor IX gene. (Read about "Clinical Studies") NHLBI says work is ongoing with animal studies, but the promise of making the leap from animals to humans could take time. Nevertheless, NHLBI says progress continues in hopes of finding a cure.

Related Information:

    Birth Defects

    Blood Disorders Glossary

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