About Alpha-1 Antitrypsin (AAT) Deficiency
AATD is caused by genetic changes in the SERPINA1 gene. These genetic changes result in decreased or abnormal alpha-1 antitrypsin protein (AAT) being produced. When there are low levels of AAT or no AAT, the lungs can become damaged.
Since AATD is an inherited condition, meaning it is passed down from parents to their children, genetics can be considered a non-modifiable risk factor. AATD is inherited in a codominant manner, meaning that if one or both parents have AATD or carry the mutated gene, their children have a higher risk of developing the condition.
The modifiable risk factors for AATD are factors that can be influenced or changed. These include:
- Smoking: This is a major risk factor for developing lung diseases, including COPD, which is commonly associated with AATD. If you have AATD and smoke, your lungs are more likely to be damaged and you may experience more severe symptoms.
- Environmental exposure: Exposure to certain environmental factors, such as air pollution and occupational dust or fumes, can increase the risk of developing lung diseases in individuals with AATD.
It's important to note that while modifiable risk factors can increase the likelihood of developing lung diseases associated with AATD, not all individuals with these risk factors will develop the condition. Additionally, some individuals with AATD may develop lung diseases even without exposure to these risk factors.
Understanding the causes and risk factors of alpha-1 antitrypsin deficiency can help individuals make informed decisions about their health and take steps to minimize their risk of developing complications associated with this condition.
People with alpha-1 antitrypsin deficiency may experience different signs and symptoms depending on the stage, progression, or severity of the condition. Here are the most common early symptoms and other common symptoms that may occur with later stages of alpha-1 antitrypsin deficiency:
Most common early symptoms include:
- Shortness of breath following mild activity
- Reduced ability to exercise
- Wheezing
Other common symptoms that may occur with later stages, progression, or higher severity include:
- Unintentional weight loss
- Recurring respiratory infections
- Fatigue
- Emphysema: This is a lung disease caused by damage to the small air sacs in the lungs. It can lead to difficulty breathing, a hacking cough, and a barrel-shaped chest.
- Liver disease: This may present as yellowing of the skin and whites of the eyes, dark urine, pain in the upper right abdomen, swelling of the lower limbs, and fluid in the abdomen.
- Panniculitis: This condition is characterized by hardened skin with painful lumps or patches.
To diagnose AATD, doctors commonly perform the following examinations, tests, and procedures:
- Nephelometry: This test measures the amount of certain proteins in blood.
- Spirometry: This test measures how well your lungs are working by having you breathe into a tube connected to a machine. It helps diagnose chronic obstructive pulmonary disease (COPD) caused by AATD.
- Genetic blood test: A doctor can tell if you have AATD by performing a genetic blood test. This test looks for specific genetic variations associated with AATD.
In addition to these common diagnostic tests, there are additional examinations, tests, and procedures that can help determine the stage or severity of AATD, including:
- Chest X-ray: This imaging test provides a picture of your lungs and can help detect any abnormalities or signs of lung damage associated with AATD.
- CT scan: Computed tomography (CT) scans provide detailed cross-sectional images of your lungs. They can help identify progressive disease during follow-up and assist in decision-making about specific therapies or surgical procedures.
- Arterial blood gas analysis: This test measures the levels of oxygen and carbon dioxide in your blood. It helps evaluate how well your lungs are functioning and can provide information about the severity of AATD-related lung disease.
- Liver biopsy (in some cases): While not always required for diagnosis, a liver biopsy may be used in difficult diagnostic situations or to estimate the outlook for AATD-related liver disease.
It's important to note that these examinations, tests, and procedures may be recommended based on individual circumstances and symptoms. Your doctor will determine which tests are appropriate for your specific situation.
The goals of treatment for AATD are to manage symptoms, slow down the progression of lung and liver damage, and improve the overall quality of life for individuals with this condition.
Common treatments recommended for AATD include:
- Alpha-1 Antitrypsin (AAT) Replacement Therapy:
- This is the main therapy for AATD. It involves infusing purified Alpha-1 antitrypsin protein into the bloodstream on a regular basis. The goal of this therapy is to restore the levels of AAT in the body, which helps to protect the lungs and prevent further damage.
- Medications for Chronic Obstructive Pulmonary Disease (COPD): People with AATD who also have COPD may benefit from bronchodilator inhalers, steroid inhalers, steroid tablets, mucolytics (which help thin mucus in the airways), and antibiotics for respiratory infections. These medications work by opening the airways, reducing inflammation, and preventing or treating infections.
- Lifestyle Behavior Changes: Making certain lifestyle changes can also help manage AATD. These changes include:
- Limiting alcohol consumption
- Exercising regularly
- Maintaining a moderate weight
- Avoiding smoking and secondhand smoke
- Eating a balanced diet
- Getting vaccinations for hepatitis A and B
- Avoiding medications or dietary supplements that stress the liver
It's important to note that treatment plans may vary depending on an individual's specific symptoms, severity of disease, and other factors. It's best to work closely with a healthcare provider to determine the most appropriate treatment approach for each person with alpha-1 antitrypsin deficiency.
Alpha-1 antitrypsin deficiency is a genetic condition that can cause lung and liver disease. The natural progression of this condition can vary among individuals, but the first signs and symptoms of lung disease typically appear between the ages of 25 and 50.
Complications commonly associated with alpha-1 antitrypsin deficiency include:
- Emphysema: This is a progressive lung disease where the air sacs in the lungs become damaged, making it difficult to breathe. Symptoms of emphysema can include difficulty breathing, a persistent cough, and a barrel-shaped chest.
- Liver Disease: In some cases, alpha-1 antitrypsin deficiency can lead to liver disease. This can manifest as jaundice, which causes yellowing of the skin and whites of the eyes. In more severe cases, liver damage can occur due to the formation of scar tissue.