About Hemophilias
Hemophilia is a blood clotting disorder that can be classified into different types. The main types of hemophilia include:
- Hemophilia A: Also known as classic hemophilia, this is the most common type of hemophilia. It is caused by a deficiency in factor VIII, a clotting factor in the blood.
- Hemophilia B: Also known as Christmas disease, this type of hemophilia occurs due to a missing or severely deficient clotting factor IX.
- Hemophilia C: This is a rare form of hemophilia, also known as factor XI deficiency. It was first discovered in 1953 and is characterized by severe bleeding after dental extractions.
In addition to these inherited forms of hemophilia, there is also a type called acquired hemophilia. Unlike congenital (inherited at birth) hemophilia , acquired hemophilia can develop without any personal or family history of the condition. It is a rare autoimmune disorder where the immune system produces antibodies that attack clotting factors, usually factor VIII. Acquired hemophilia develops later in life (not at birth).
It's important to note that while most cases of hemophilia are genetic in nature, acquired hemophilia is an exception and occurs due to autoimmune factors rather than genetic variations.
The pathophysiologic causes of hemophilia are related to these genetic mutations. In hemophilia A, there is a deficiency or absence of clotting factor VIII, while in hemophilia B, there is a deficiency or absence of clotting factor IX. These clotting factors are necessary for the formation of blood clots, which help stop bleeding.
Risk factors for hemophilia include:
- Genetics/Family History: Most cases of hemophilia are inherited in an autosomal recessive manner. There is a mutation in the gene responsible for producing clotting factors.
- Male assigned at birth: Congenital hemophilia primarily affects males, although it can occur in females.
- Underlying autoimmune conditions such as lupus, rheumatoid arthritis, and multiple sclerosis can increase the risk of developing acquired hemophilia.
- Health conditions such as inflammatory bowel disease, diabetes, hepatitis, and certain infections may also be risk factors for acquired hemophilia.
- Reactions to medications such as penicillin and interferon have been associated with acquired hemophilia.
- Pregnancy or giving birth can increase the risk of developing acquired hemophilia.
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Hemophilia is a bleeding disorder that affects the body's ability to form blood clots.
The most common early symptoms of hemophilias include:
- Easy bruising: People with hemophilia may experience bruising underneath their skin. This can happen even from minor bumps or injuries.
- Bleeding from the mouth and gums: Hemophilia can cause bleeding from the mouth and gums, which may occur after brushing teeth or eating hard foods.
- Nosebleeds: Frequent and difficult-to-stop nosebleeds are another common symptom of hemophilia.
- Bleeding after vaccinations: People with hemophilia may experience bleeding at the site of vaccination.
As hemophilia progresses or becomes more severe, additional symptoms may occur. These symptoms can include:
- Bleeding into joints: Hemophilias can cause bleeding into the joints, leading to pain, swelling, and limited mobility. This is one of the hallmark symptoms of severe cases.
- Bleeding into muscles: In more severe cases, bleeding can occur into the muscles, causing bruising or hematomas (pockets of blood).
- Bleeding in other organs: People with hemophilia may experience bleeding in other organs such as the digestive organs, urinary and genital organs, or even in the brain. This can lead to serious complications if not treated promptly.
- Blood in urine or stool: People with hemophilia may notice blood in their urine or stool, which should be evaluated by a healthcare professional.
- Heavy genital bleeding after giving birth: In some cases, people with hemophilia may experience heavy bleeding after giving birth.
To diagnose hemophilia, doctors typically perform a series of examinations, tests, and procedures. These help to identify the presence of bleeding problems and determine the type and severity of hemophilia.
Hematologists (doctors who specialize in diseases of the blood) and pathologists (doctors who specialize in examining samples of tissues and body fluids for presence of disease or abnormalities) are often involved in diagnosing hemophilia.
Here are the commonly performed examinations, tests, and procedures for diagnosing hemophilia:
- Review of symptoms: Doctors will ask about the individual's symptoms, such as frequent or prolonged bleeding, easy bruising, or excessive bleeding after injury or surgery.
- Review of personal medical history: Doctors will inquire about the individual's personal medical history, including any previous episodes of bleeding or family history of hemophilia or other bleeding disorders.
- Clinical evaluation: A physical examination will be conducted to look for physical signs of bleeding.
- Blood tests: Blood tests are crucial for diagnosing hemophilia. They provide valuable information about how long it takes for blood to clot and the levels of clotting factors present in the blood. The specific blood tests used include:
- Complete blood count (CBC): This test measures different components of blood, including red blood cells, white blood cells, and platelets.
- Partial thromboplastin time (APTT) test: This test evaluates how well the blood clots by measuring the time it takes for a clot to form.
- Prothrombin time (PT) test: This test assesses the ability of blood to clot by measuring the time it takes for a clot to form using specific reagents.
- Fibrinogen test: This test measures the levels of fibrinogen in the blood. Fibrinogen is a protein involved in clot formation.
- Clotting factor tests: These tests determine which specific clotting factors are present in lower amounts or missing altogether. They can help identify the type and severity of hemophilia.
- Genetic testing: Genetic tests involve analyzing samples of blood, saliva, or other tissues to identify Factor VIII or Factor IX genetic mutations associated with hemophilia. This testing can confirm or rule out suspected genetic diseases and determine an individual's chance of developing or passing on a genetic disease. Genetic counselors help explain results of genetic counseling. Genetic testing may be done to:
- Identify people who may be carriers of hemophilia genes to make decisions about pregnancy.
- Test a fetus (unborn baby) for the genetic mutation associated with hemophilia.
- Test a newborn for the genetic mutation associated with hemophilia.
Other examinations and tests may be recommended based on initial findings and individual factors.
The main treatment goals for hemophilia are to prevent bleeding (prophylactic care) and to stop bleeding episodes if they occur (episodic care) to minimize blood loss and other complications.
Here are the primary categories of hemophilia treatments and medications:
- Clotting Factor Replacement: Clotting factors may be given to people with hemophilia on an on-going basis to replace the clotting factor that is missing or not functioning properly. Clotting factors helps them form clots and prevent or stop bleeding. The specific type of hemophilia will determine the type of clotting factor replacement therapy prescribed. Some clotting factors are made from human plasma from blood donors and others are recombinant (genetically engineered, not made from human plasma).
- Concentrated Factor VIII (FVIII): These are infused medications for treating Hemophilia A.
- Concentrated Factor IX (FIX): These are infused medications for treating Hemophilia B.
- Non-clotting Factor Treatments:
- Emicizumab: This is a newer, non-factor treatment for Hemophilia A. It is a monoclonal antibody that acts like Factor VIII to enable clotting.
- Marstacimab: This is a newer, non-factor treatment for Hemophilia A and Hemophilia B. It is a monoclonal antibody that prevents inhibition of Factor Xa, which enables clotting by bypassing Factor VIII or Factor IX in the normal clotting cascade.
- Desmopressin acetate: This medication is similar to a natural hormone in the body that causes Factor VIII to release from where it is stored in the body. It is used for people who have mild Hemophilia A and are able to make some Factor VIII.
- Anti-fibrinolytics: These medications help prevent clots from breaking down, which can help control bleeding. Aminocaproic acid is an example of an anti-fibrinolytic drug. It may be prescribed prior to dental or other procedures to help prevent bleeding after the procedure.
- Gene Therapy: Gene therapies are one of the newest treatments for hemophilia. Gene therapy involves infusing a medication with the gene needed to produce clotting factor. Currently available gene therapies for hemophilia are:
- Valoctogene roxaparvovec-rvox: This gene therapy is approved for adults with Hemophilia A.
- Etranacogene dezaparvovec: This gene therapy is approved for adults with Hemophilia B.
- Fidanacogene elaparvovec: This gene therapy is approved for adults with Hemophilia B.
Other Therapies
- Fibrin sealants: These are medicines applied directly to cuts and wounds to help clotting.
- First aid: Pressure bandages and ice packs are recommended to manage minor cuts and small areas of bleeding.
- Physical therapy: In more severe cases where hemophilia has damaged joints, physical therapy may be recommended for rehabilitation. This can help improve joint function and manage pain.
Lifestyle and Self-Care
In addition to medication and therapeutic procedures, there are certain lifestyle behavior changes that can help manage hemophilias:
- Avoid medications that may increase risk of bleeding: This includes blood thinning medications, aspirin, and non-steroidal anti-inflammatory drugs (NSAIDs). Consult a healthcare professional before starting new medications.
- Avoid activities that may cause injury or bleeding: Individuals with hemophilias should avoid activities that have a high risk of injury or bleeding, such as contact sports or activities that involve sharp objects.
- Regular check-ups: Regular check-ups with healthcare providers are important for monitoring the condition and adjusting treatment as needed.
- Dental care: Dental procedures should be performed with caution, and specific measures may be taken to ensure minimal bleeding during dental treatments.
- Get vaccinations: The Centers for Disease Control and Prevention (CDC) recommends that people with hemophilia receive recommended vaccines. Be sure the healthcare professional administering the vaccine is aware you have hemophilia and uses the smallest gauge needle possible. Apply pressure or ice for 3-5 minutes after injection to reduce risk of bleeding.
Overall, the goal of treatment for hemophilias is to prevent bleeding episodes, manage pain, and improve overall quality of life for individuals living with these conditions. Treatment plans will vary depending on the specific type and severity of hemophilia, and should be discussed with a healthcare provider.
Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Side effects can occur. Check with your health care professional or read the information provided with your medication for side effect information.
Hemophilia is currently not curable and considered to be a lifelong condition that tends to persist throughout a person's life. It is important to note that the severity of symptoms can vary widely among individuals with hemophilia. More research is needed to determine the long-term impact of gene therapy on the hemophilia.
Complications of hemophilia include:
- Bleeding: People with hemophilia have a reduced ability to form blood clots, which can lead to prolonged bleeding episodes. This can occur after injuries, surgeries, or even spontaneously.
- Joint damage: Recurrent bleeding into joints can cause damage and lead to chronic pain and limited mobility. This is especially common in weight-bearing joints like the knees and ankles.
- Muscle and soft tissue bleeding: Bleeding can also occur in muscles and other soft tissues, leading to swelling, pain, and reduced function.
- Organ bleeding: In severe cases, bleeding can occur in internal organs, such as the brain or gastrointestinal tract. This can be life-threatening and requires immediate medical attention.
Complications from treatment of hemophilia include:
- Inhibitor development: Some people with hemophilia develop antibodies against clotting factors used to treat hemophilia. These antibodies are called inhibitors and make clotting factors less effective over time.
- Infections from transfusions: Blood tranfusions in the United States are tested and generally safe, but may have a risk of transmitting infections such as HIV.
Prevention of bleeding and rapid attention to bleeding episodes are crucial to reducing the risk of long-term complications. Multi-disciplinary teams available at Hemophilia Treatment Centers and other specialized clinic can assist people with hemophilia learn the self-care approaches to preventing bleeding and managing bleeding episodes.