Thalassemia is a disease of blood disorders caused by genetic factors and causes the proteins present in red blood cells ( hemoglobin ) doesn't function normally. The iron obtained by the body from food is used by the bone marrow to produce hemoglobin. Hemoglobin contained in red blood cells serves to deliver oxygen from the lungs to all members of the body. Thalassemia patients have low hemoglobin levels, therefore oxygen levels in the body of thalassemia sufferers are also lower.
There are two types of thalassemia that occur, namely alpha and beta, where these two types have a gene link that determines the severity of this inherited disease. Thalassemia beta is a more common type.
Thalassemia can sometimes interfere with the activities of the patient due to the weak oxygen levels in the body. Some things that can be experienced by the patient is tired, easily drowsy, unconscious, to difficulty breathing. In addition, untreated thalassemia can also lead to complications such as heart failure, stunted growth, organ damage, liver disorders, and death.
Symptoms of Thalassemia
The symptoms of thalassemia experienced by each person vary, depending on the severity and type of thalassemia suffered. To work normally, hemoglobin requires 2 alpha proteins and 2 beta proteins. Abnormalities in alpha proteins are called alpha thalassemia, and abnormalities in beta proteins are called beta thalassemia.
If there are many mutations in the genetic material that makes hemoglobin, then the thalassemia suffered will be severe. However, if the mutations that occur little or limited, then the symptoms can be lighter. For severe cases, blood transfusions will often be needed.
Some examples of thalassemia symptoms are low weight, shortness of breath, fatigue, and jaundice.
Causes of Thalassemia
Mutations in DNA that produce oxygen-carrying hemoglobin throughout the body are the cause of a person suffering from thalassemia. Not yet known exactly why such mutations can occur.
Diagnosis of Thalassemia
Blood tests can be performed to diagnose thalassemia. But to know the type of thalassemia suffered, the patient must do a DNA test.
Blood tests can be used to evaluate hemoglobin and measure the amount of iron contained in the blood. In addition, this method can also be done to analyze DNA to determine whether a person has a mutated hemoglobin gene.
Examination of infants performed during pregnancy (antenatal examination) is useful to provide information that parents need to prepare themselves. In addition, early examination also aims to determine the presence of other genetic diseases (eg sickle cell anemia).
Treatment of Thalassemia
Thalassemia may be treated with cord blood transfusion and bone marrow transplantation. However, these two methods of treatment are not suitable for all thalassemia sufferers and may result in a number of complications.
Regular blood transfusion is necessary for beta thalassemia patients, but this can result in the accumulation of iron in the body and cause serious health problems. Treatment to get rid of excess iron in the body can be done with chelation therapy.
Complications of Thalassemia
The risk of thalassemia complications can be reduced by routine medical examinations. Some possible complications of thalassemia that can occur are hepatitis, osteoporosis, late puberty, and heart rhythm disorders.
Symptoms Of Thalassemia
Symptoms of thalassemia experienced by each person may vary, depending on the severity and type of thalassemia suffered. Here are some common thalassemia symptoms:
- Urine is cloudy.
- The face looks pale.
- Deformity of facial bone.
- The skin and parts of the white eye become yellow (jaundice / jaundice).
- Inhibition of body growth.
- The stomach becomes swollen (caused by enlarged spleen or liver).
- Deficiency of red blood cells or anemia (causing the breath to feel tight, the body easily tired, and lethargic).
Lack of hemoglobin in children with severe thalassemia will make the body produce more bone marrow than usual. This is the way the body seeks to overcome the shortage of hemoglobin. This can lead to unnatural bone growth or bone skeletal deformities.
In addition, to produce more hemoglobin, the body will absorb more iron from food consumed or through blood transfusions that can result in accumulation of iron in the body. This could potentially cause some problems as follows:
- Body growth at puberty will be delayed or not occur at all due to disruption of the hormone system in the body.
- More susceptible to infection due to soft tissue damage, especially the spleen and liver
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Causes Of Thalassemia
Mutations in the DNA that produce oxygen-carrying hemoglobin throughout the body are the cause of a person suffering from thalassemia. It is not known exactly what caused the mutation to occur. However, this is thought to be related to genetic factors.
Cases of genetic diseases (such as thalassemia and sickle cell anemia) are more common in Asian, African-American or Middle Eastern countries, as well as some countries such as Cyprus, Italy, or Greece.
Types of Thalassemia
The portion of the hemoglobin affected by the mutation and the number of inherited mutations from the elderly determine the type of thalassemia suffered. Mutations can affect hemoglobin consisting of 2 alpha proteins and 2 beta proteins. Thalassemia suffered will be more severe if the genes that have mutations more and more.
The alpha hemoglobin protein consists of four genes from both parents, each inheriting two genes. The following is an explanation of the severity of symptoms based on alpha thalassemia gene mutations:
- Symptoms of thalassemia do not appear if a mutated gene, but the person can reduce the disease to his child because he is a host or carrier of thalassemia disease.
- Symptoms of thalassemia appear only mild if two genes mutate, and this condition is called thalassemia alfa minor.
- Symptoms of thalassemia appear to be moderate to severe if three genes mutate. This condition is also called hemoglobin H disease.
- The fetus will die or the newborn will die shortly after birth if the four genes mutate. This condition is called thalassemia alfa major.
The beta hemoglobin protein comprises two genes from the elderly, each inheriting one gene. The following is an explanation of the severity of symptoms based on thalassemia beta gene mutations:
- Symptoms of thalassemia that appear only mild if only one gene that mutated, and called thalassemia beta minor.
- Symptoms of thalassemia appear to be moderate to severe if two genes mutate, and are called thalassemia beta major or Cooley anemia. Two mutated genes can also be called thalassemia beta intermedia if symptoms are milder. Usually babies who experience this condition look healthy at birth. But after the age of two, new symptoms will appear.
Diagnosis Of Thalassemia
Blood tests can be performed to diagnose thalassemia. But to know the type of thalassemia suffered, must do a DNA test. A person may be suspected of having thalassemia if his blood test results show:
- Pale red blood cells.
- Low levels of red blood cells.
- The shape and size of red blood cells are diverse.
- Red blood cells are smaller than normal.
Blood tests can also be used to evaluate hemoglobin and measure the amount of iron contained in the blood. In addition, blood tests can also be applied to analyze DNA to check the type of thalassemia suffered.
Examination conducted during pregnancy or called antenatal examination is useful to provide information that parents need to prepare themselves, as well as to detect the presence of other genetic diseases (eg sickle cell anemia).
An antenatal examination consists of two methods. The first method is a cell examination of a sample of amniotic fluid that is usually performed when the womb is 15-20 weeks old, or called amniocentesis . The second method is cell examination of placental samples or chorionic villus sampling , and is usually performed when the womb is 11-14 weeks old.
There is one method that can be done by couples who want to have offspring, but have a tendency to pass on genetic diseases to the baby. The method is called the preimplantation genetic diagnosis, which removes the egg from the female ovary and fertilizes it with male sperm in the laboratory. The examination is performed on a fertilized embryo to ensure the absence of thalassemia, then a healthy embryo can be implanted into a woman's uterus.
Treatment Of Thalassemia
The type and severity of thalassemia will determine which treatments can be performed. Usually thalassemia minor patients experience only mild symptoms and do not require special care, but blood transfusions are usually needed to help overcome thalassemia complications, after childbirth, or after surgery.
Most thalassemia beta intermedia patients do not require blood transfusions. While patients with major thalassemia beta generally require regular blood transfusions (usually once a month or less) to get the hemoglobin needed by the body. Frequency will be determined according to the condition of thalassemia experienced by the patient.
Treatment to overcome the excess iron in the blood can be done with chelation therapy. It aims to prevent extensive organ damage (eg to the liver, body hormone glands, or heart) due to accumulation of iron in the blood. Usually children who have received a blood transfusion about 10 times require chelation therapy. The frequency of chelation therapy will be assessed regularly and may change, but usually this treatment lasts a lifetime. There are currently three chelation agents or drugs used in chelation therapy, namely deferiprone, deferasirox, and desferrioxamine.
Tests to measure iron levels can be done with blood tests, liver organ biopsy, echocryography, electrocardiogram and MRI scans . To monitor whether chelation therapy is effective, checking levels of iron in the blood is done routinely.
Bone Marrow Transplant
Treatment to cure thalassemia is possible with bone marrow transplantation. Bone marrow donated from a proven and healthy donor is used to replace bone marrow affected by thalassemia and is useful for producing healthy blood cells.
Unfortunately bone marrow transplantation is not always suitable and beneficial for every patient. Someone has to find the right donor, and the risk of this procedure is quite serious. That is why thalassemia treatment with bone marrow transplant is only done if the condition suffered is severe and should be discussed with the family. In addition, there is a risk that the donor bone marrow does not match the body of the thalassemia patient who receives it causing the following reaction:
- The rash then blisters
- Abdominal pain, diarrhea, and blood in the stool
- Shortness of breath to tightness
- Blood clots until infection
It is very difficult to find a suitable bone marrow type from a person who has no blood relationship with the patient.
Risk factors that determine the success rate of bone marrow transplantation are severe liver damage, high body iron levels, and size of the liver. The following is the likelihood of success in children under 16 who receive suitable bone marrow donors:
- If he does not have the risk factors mentioned above, then the chances of success are 90 percent and the chance of survival is 95 percent.
- If he has fewer than three risk factors, then the chances of success are more than 80 percent and the chances of survival are over 85 percent.
- If he has three risk factors, then the chances of success are more than 55 percent and the probability of survival is less than 80 percent.
Complications Of Thalassemia
Patients with thalassemia beta major and some patients with thalassemia beta intermedia at risk of complications. Below will be explained one by one about the complications associated with thalassemia.
Heart damage due to high levels of iron can lead to decreased cardiac pump strength, heart failure, arrhythmia (irregular heartbeat), and accumulation of fluid in the heart tissue.
There are two types of routine examinations that should be undertaken by patients with thalassemia beta major, namely the examination of heart function every 6 months and a thorough examination by using electrocardiogram once every 1 year to measure the conduction of heart electrical flow. Both of these tests are performed by a cardiologist.
Treatment to improve cardiac function can be done with more thorough chelation therapy and consumption of angiotensin converting enzyme inhibitors.
Bone marrow will develop and affect bone due to the body lack of healthy red blood cells. Bone problems at risk include:
Bone marrow will develop and affect bone due to the body lack of healthy red blood cells. Bone problems at risk include:
- Painful joints and bones
- Bone deformity
The risk of fractures increases if the bone density becomes low. This risk can even happen to people who get blood transfusions regularly. That's why people with beta thalassemia major are advised to take vitamin D and calcium supplements, and eat foods rich in vitamin D and calcium as follows:
- Orange juice
There are several types of exercise that can be done to help strengthen bones and prevent osteoporosis, including:
Bisphosphonates can be consumed to maintain bone density and reduce the risk of fractures, but this drug can affect normal bone growth. Therefore bisphosphonates are not recommended for children and adolescents.
Enlarged Spleen (Splenomegali)
Splenic enlargement occurs because the organ is difficult to recycle blood cells that have abnormal forms. This results in an increase in the amount of blood present in the spleen, thus making the size larger.
Blood transfusion aimed at increasing the number of healthy blood cells would be ineffective if the spleen had enlarged. The spleen will become overactive and begin to destroy healthy blood cells. Splenectomy or surgical removal of the spleen is the only way to overcome this problem.
Vaccinations to treat the potential for serious infections, such as flu and meningitis, should be done if your child has had surgical removal of the spleen. Immediately see a doctor if your child has symptoms of infection, such as muscle aches and fever, because it can be fatal.
Problems on the Heart
Damage to the liver due to high iron levels can lead to several problems, such as hepatitis, fibrosis or liver enlargement, as well as cirrhosis (chronic degenerative disease in which normal liver cells become damaged and replaced by scar tissue). Therefore, patients with thalassemia are recommended to perform liver function tests every three months.
Prevention of liver infection can be done by taking antiviral drugs, while the prevention of liver damage is more severe can be done with chelation therapy.
Problems with the Hormone Gland
The hormone system is regulated by the highly sensitive pituitary gland of iron. Thalassemia major beta patients, despite chelation therapy, may experience hormonal system disorders.
Treatment with hormone replacement therapy may be necessary to overcome delayed growth and puberty due to damaged pituitary gland. There are several complications in the hormone gland that can occur after puberty as follows:
- Thyroid gland - hyperthyroidism or hypothyroidism
- Pancreas - diabetes
Height and height examination should be followed by children with thalassemia every six months for the growth rate to be known. Meanwhile, the growth check on teenagers who have entered puberty should be undertaken once a year.