Have you ever heard of a "hole in the heart"? Perhaps your own child, or someone you know, has been told by a doctor that this is a condition. It's normal to feel a little scared and shocked when you hear these words. However, if you are properly informed about this, this is a condition that can often be successfully managed. Today we are going to talk about this "hole in the heart", which in medical science we call Atrial Septal Defect , or ASD for short.
What is atrial septal defect (ASD)? Let's understand it very simply.
Simply put, an atrial septal defect (ASD) is a small hole in the wall (septum) between the two upper chambers of our heart, the atria. This is a congenital heart defect . This means that a baby can have this condition at birth. It happens when that wall doesn't form completely as it should. Many people also call it a "hole in the heart."
Now, look, what happens because of this hole? Some of the oxygen-rich, clean blood in the left atrium of our heart starts to leak through this hole into the right atrium. The right atrium normally has less oxygen-rich blood, which needs to be sent to the lungs to be cleaned. Then the extra oxygen-rich blood that comes in collects and goes back to the lungs. It's like blood just going back and forth.
Normally, oxygen-rich blood flows from the left atrium to the left ventricle, where it is pumped throughout the body. However, when you have an ASD, this process is a little different.
If this hole is small, it may not be a big problem. Sometimes it can be treated without any treatment. But if the hole is large, it can affect the heart and lungs. That's when symptoms appear and treatment is needed.
It's important to note that Atrial Septal Defect (ASD) is different from a condition called Patent Foramen Ovale (PFO) . It's best not to confuse the two, right?
What are the main types of ASD?
Four main types of ASD can be identified depending on where the hole is located in the wall between the atria of the heart.
1. Secundum Atrial Septal Defect: This is the most common type. About eight out of ten people with ASD have this type. It is located in the middle of the wall between the atria.
2. Primum Atrial Septal Defect: In this type, the hole is in the lower part of the atrial wall. Babies with this type of ASD can sometimes have holes in the wall between the lower chambers of the heart (ventricular septal defect - VSD), or defects in the heart valves, especially the tricuspid valve or mitral valve .
3. Sinus Venosus Atrial Septal Defect: This is located in the upper or lower posterior part of the atrial wall. This type may be associated with defects in the right pulmonary vein or the superior vena cava or inferior vena cava, the two main veins that carry blood to the heart.
4. Unroofed Coronary Sinus: This is the rarest type of ASD. It is characterized by the absence or incompleteness of the wall between the coronary sinus , a group of veins that connect the heart, and the left atrium. This is often associated with other complex congenital heart diseases.
What symptoms does someone with ASD show?
Surprisingly, although ASD is a condition that is present at birth, many people do not show any symptoms until years later, sometimes into adulthood. If the hole is small, less than 5 millimeters, it may not cause any symptoms because it does not significantly affect the heart or lungs.
The most common (and perhaps only) symptom is a heart murmur. This is heard when a doctor puts a stethoscope to your child's heart.
If children show other symptoms, including:
- Underweight for age
- Growth retardation
- Frequent respiratory infections (e.g. pneumonia)
- Rarely, fatigue, shortness of breath, and heart rhythm irregularities (arrhythmias) may occur while playing, running, or jumping.
If your child has any of these symptoms, it is very important to tell the doctor about them. The doctor will then be able to perform the necessary tests to check the structure and function of the child's heart.
Adults with ASD may begin to experience symptoms around the age of 40. These symptoms depend on how much the heart and lungs are affected. They include:
- Fatigue
- Shortness of breath when exercising or walking
- Heart palpitations
- Rapid heartbeat (Tachycardia)
- Swelling of the hands and feet (Edema)
- Perhaps blue skin (cyanosis) - this is a slightly more severe case.
If you have any of these symptoms, see a doctor immediately. These could be signs of an untreated ASD, or they could be signs of another heart condition. If you have chest pain , go to the nearest hospital immediately.
Why does ASD occur? What are the causes?
The exact cause of ASD is not yet fully understood. However, most congenital heart defects are caused by genetic changes that occur during pregnancy. Some of the genetic mutations associated with ASD have been found to occur in the genes NKX2.5/CSX, GATA4, and TBX5 .
Some babies born with ASD may also have other heart defects or genetic conditions. For example:
- Mitral or pulmonary valve disease
- Ventricular septal defect (VSD) - This is a hole in the wall between the lower chambers of the heart.
- Holt-Oram syndrome
- Down syndrome
- Williams syndrome
Are there risk factors?
If you are pregnant, there are some factors that increase the risk of your baby having a congenital heart defect. These are:
- Diabetes that existed before pregnancy
- Flu- like infections during pregnancy
- Alcohol use
- Use of tobacco products
- Certain prescription medications (therefore, do not take any medication during pregnancy without consulting a doctor)
- Recreational drug use, especially cocaine.
What are the possible complications of an ASD?
Imagine, a small ASD doesn't have much effect on the body. But if the hole is large, it puts a lot of strain on the right side of the heart. Do you know why? With that extra blood coming in, the right side has to pump more blood to the lungs. This extra blood flow can damage the blood vessels in the lungs over time.
The main problems that can occur due to large ASD are:
- Right heart enlargement: If left untreated for a long time, this can lead to heart failure .
- Heart rhythm irregularities (Arrhythmia): At least half of people with ASD over the age of 40 develop irregularities such as atrial fibrillation or atrial flutter .
- Stroke: A condition caused by reduced blood flow to the brain. This can happen if a blood clot breaks through the hole and becomes lodged in a blood vessel in the brain.
- Pulmonary hypertension: Increased blood pressure in the arteries that supply blood to the lungs.
- Eisenmenger syndrome: This is a serious condition that occurs when both ASD and severe pulmonary hypertension occur together.
How do doctors diagnose ASD?
A doctor diagnoses ASD with a physical exam and several special tests that examine the structure and function of the heart. One or more of these tests may be done to find out exactly how an ASD has affected the heart.
- Electrocardiogram (EKG/ECG): This measures the electrical activity of the heart. It can detect any irregular heartbeats or other problems with the heart's electrical system.
- Chest X-ray: This can check to see if the right side of the heart is enlarged and if the ASD has affected the blood vessels in the lungs.
- Transthoracic echocardiogram (TTE): This is like an ultrasound scan of the heart. It can look at how the heart is affected by the flow of blood from the left side to the right side, and can provide details about pulmonary hypertension. It can also measure the size of the hole.
- Transesophageal echocardiogram (TEE): This involves passing a small camera-equipped tube down the throat and into the heart. This allows the size, shape, and location of the ASD, as well as the condition of the heart valves, to be clearly seen.
- Intracardiac echocardiogram (ICE): This also involves passing a small camera through a vein into the heart to look at the size, shape, and direction of blood flow through the ASD.
In some cases, a doctor may also use a cardiac CT scan or a heart MRI . These are most useful for people with additional defects or rare types of ASD.
How is ASD treated?
A doctor can prescribe medications to control some of the symptoms of an ASD. However, medications alone cannot close the hole. To close the hole, you need to do either surgery or a non-surgical procedure called a percutaneous procedure.
If the hole is small, you can live with it. A small ASD hole that does not close on its own usually does not need treatment. In the case of a child, if the ASD has not closed by the age of 2 or 3 and it is causing problems, doctors may recommend closing the hole (ASD closure).
However, if it is a large ASD, it is best to treat it even if there are no symptoms. If treated now, serious complications that may occur in the future can be prevented. This also applies to adults.
If there are signs of damage to the heart or lungs, it is essential to close the ASD. A doctor will recommend treatment, especially:
- If the right side of the heart is larger than normal.
- If a significant amount of blood is flowing through the ASD hole.
After the hole is closed, you may need to take anticoagulant or antiplatelet medications for about 6 to 12 months. These prevent blood clots from forming on the closure device (a rare complication).
Also, you will need to take antibiotics for at least 6 months after the hole is closed. This can help prevent endocarditis, an infection of the inner lining of the heart.
When should I see a doctor?
If you have an ASD, it's important to keep your doctor's appointments and follow his or her instructions. ASD is often treated with "watchful waiting." This means that a doctor will monitor your condition and treat you as needed. Your doctor will tell you how often to come back for follow-up appointments.
If you have an ASD, go for follow-ups as your doctor recommends. You will probably need to go in a month, three months, six months, and a year. Then about once a year.
If your child has an ASD, the doctor will tell you what to do next and when treatment is needed. Usually, "watchful waiting" is the treatment for minor ASDs. For major ASDs, procedures may need to be done early on to prevent future problems.
You can ask the doctor questions like:
- Does my child need surgery?
- How often should I see my child for "monitoring"?
- Should I get my siblings tested for ASD? (Because ASD can run in some families)
- Should I have surgery as an adult?
What should I expect if my child has this condition?
After an ASD is closed, the child will need to limit activities for a while until they recover. After that, they should be able to run, play, and be physically active without any restrictions.
The prognosis for a child who has had an ASD closed is very good. No further treatment is usually needed.
How is the lifespan?
A person with an ASD may have a slightly shorter life expectancy than the average person. But life expectancy depends on many factors, such as the size of the ASD and whether it was treated or not.
The timing of treatment is also important. People who are treated for ASD early in life have a better outcome. This may be because early treatment can catch the problem before it causes serious damage to the heart or lungs. People who develop complications may have a slightly worse outcome.
Finally, things to keep in mind (Take-Home Message)
It's normal to feel a great burden when you find out you have a "hole in the heart." And if it's your own child, the fear is even greater. But there's good news. With advances in medical science today, a condition called atrial septal defect can be treated much more successfully than in the past. Some ASDs are so small that they cause no problems and don't even need treatment.
The most important thing is to talk to your doctor or your child's doctor to get a clear idea of what to do next. If possible, seek advice and treatment from a hospital with a congenital heart disease specialist who has extensive experience. Such specialists can manage you using the latest treatments and techniques tailored to your condition.
Remember, you can live well with this condition by not being afraid, knowing the correct information, and following your doctor's advice.
` Hole in the heart, atrial septal defect, ASD, congenital heart disease, pediatric heart disease, heart surgery, heart disease symptoms
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