Diamond Blackfan Anemia (DBA)
Diamond Blackfan Anemia (DBA)
What is DBA?
Diamond Blackfan anemia (DBA) is a rare blood disorder. Children with DBA do not make enough red blood cells. These are the cells that carry oxygen to all other cells in the body.
Blood cells are made in the bone marrow, the spongy insides of long bones. In children with DBA, many of the cells that would have become red blood cells die before they develop.
What causes DBA?
DBA may be passed down through families. In about half the children with the disorder, an abnormal gene has been identified. In the other half of children with DBA, no abnormal genes are found and the cause is not known.
What are the symptoms of DBA?
Most of the time, signs or symptoms of anemia appear by 2 months of age. Symptoms may range from mild to severe. They include:
Signs and symptoms of anemia:
Other signs of DBA include:
- Pale skin
- Rapid heartbeat
- Heart murmur
- Physical defects of the face, head, neck, hands and arms, kidneys, heart, and penis in males
- Low birth weight
How is DBA diagnosed?
The diagnosis of DBA is usually made in the first year of life. It is diagnosed based on the presence of signs and symptoms and results of blood and bone marrow testing.
Anemia is diagnosed with:
Hemoglobin and hematocrit. This measures the amount of hemoglobin and red blood cells in the blood.
Complete blood count (CBC). A complete blood count checks the red blood cells, white blood cells, blood clotting cells (platelets), and sometimes, young red blood cells (reticulocytes). It includes hemoglobin and hematocrit and more details about the red blood cells.
Peripheral smear. A small sample of blood is examined under a microscope. Blood cells are checked to see if they look normal or not.
Bone marrow analysis is also done. A sample of bone marrow cells is taken and examined.
Diagnosis of DBA is based on these 4 findings from a complete blood count (CBC) and bone marrow biopsy.
- Anemia before 1 year of age
- Macrocytic anemia, which means red blood cells are larger than normal
- Low reticulocyte count, which are new red blood cells
- Normal bone marrow sample, with only a few cells that will develop into red blood cells
Other lab tests may also be abnormal. Genetic testing may show gene defects or changes.
How is DBA treated?
Treatment may include medications, blood transfusions, and bone marrow transplantation. DBA was once thought of as a disease only of children. With more successful treatments, however, many children survive well into adulthood, and many more adults now are living with the disease.
Specialists treat children with DBA. Your child's health care provider may recommend a hematologist, a blood specialist or a geneticist, a gene specialist or other experts. DBA is treated with:
Corticosteroid or s
teroid medications. Steroids improve red blood cell counts in about 80% of people with DBA. Steroids are strong medications with some serious side effects. Your child's provider will watch for side effects and use as low a dose as possible.
Blood transfusions. Donor blood may be given every 4 to 6 weeks to increase red blood cells counts.
Stem cell transplant. Stem cells are cells in the bone marrow that can become all types of blood cells. A matched donor's stem cells, usually a close family member, are given to the person with DBA. Stem cell transplant may cure DBA, but rejection or infection is possible. Because these risks are serious, stem cell transplant is usually not used unless steroids or blood transfusions do not help.
About 20% of people with DBA go into remission after treatment. Remission means that the signs and symptoms of anemia have disappeared for more than 6 months without any treatment. Remission can last for many years and can even be permanent. If symptoms come back after remission, it is called relapse.
What are the complications of DBA?
Complications of DBA include:
- Slow or delayed growth
- Problems with pregnancy
- Problems related to physical defects (for example, heart problems)
- Leukemias and other cancers
Some complications from the treatment of DBA include:
- Osteoporosis or softened bones, weight gain, high blood pressure, and diabetes are complications of long-term steroid use.
- Iron overload, which can affect the heart and liver, is a complication of transfusions.
How is DBA managed?
Your child will be monitored very closely. He or she will have:
- Frequent physical exams and lab and other diagnostic tests
- More frequent screenings for cancer
- Genetic counseling, for you, your child, and other brothers and sisters. This is very important before any pregnancy.
Severe anemia in a child affects the whole family. You should:
- Learn as much as possible about DBA.
- Work closely with your child's health care provider.
- Help your child take part in school, social, and physical activities.
- Work closely with your child’s school to make sure he or she gets what is needed. Your child may also qualify for special programs under Section 504 of the Rehabilitation Act of 1973.
- Try to keep your child's life as normal as possible.
- Remember to also pay attention to other children in the family.
When should I call the health care provider?
You know your child better than anyone else. If you are in doubt or if you have questions or concerns, it is best to contact his or her provider.
And, work closely with your child's health care providers to know what to report. It depends on your child's age, treatment and other factors. For example, your child's provider will tell you what to watch for if your child has had a stem cell transplant. Or if your child is taking a certain medication, the provider will tell you what side effects may occur.
- DBA is a rare blood disorder in which children do not make enough red blood cells–the cells that carry oxygen to all other cells in the body.
- About 50% of children with DBA have a genetic mutation. Genetic counseling is recommended.
- It is usually diagnosed during the first year of life with blood and bone marrow tests.
- DBA is treated with corticosteroids and blood transfusions.
- Stem cell transplants offer a cure for DBA.
Tips to help you get the most from a visit to your health care provider:
- Before your visit, write down questions you want answered.
- Bring someone with you to help you ask questions and remember what your provider tells you.
- At the visit, write down the names of new medicines, treatments, or tests, and any new instructions your provider gives you.
- If you have a follow-up appointment, write down the date, time, and purpose for that visit.
- Know how you can contact your provider if you have questions.