Patent Ductus Arteriosus (PDA): Know the Symptoms, Treatment, and Prevention

Imagine your heart as a pump that sends blood throughout the body. During pregnancy, there is a small blood vessel called the ductus arteriosus that connects the lung artery to the aorta (the main blood vessel leaving the heart). This blood vessel is important because while the fetus is still in the womb, its lungs are not yet fully functioning. The ductus arteriosus diverts some of the blood away from the lungs to prevent overload.

01 / Heart Disease

What Is Patent Ductus Arteriosus (PDA)?

Patent Ductus Arteriosus (PDA) is a medical condition that occurs when the ductus arteriosus, a blood vessel connecting the pulmonary artery and the aorta, does not close after birth. During fetal development, the ductus arteriosus carries blood from the heart to the fetus’s body, bypassing the lungs, which are not yet functioning. However, after the baby is born and the lungs start working, the ductus arteriosus usually closes naturally. When this ductus stays open, blood can flow back into the lungs, putting extra strain on the heart and lungs.

Prevalence of PDA

PDA is more common in babies born prematurely, with about 60% of very premature babies (birth weight under 1,500 grams) having this condition. The incidence of PDA in babies born at term (full-term) is much lower, only about 0.1% to 0.2%. Although PDA is more common in babies, it can also be found in children and adults, although its frequency decreases with age. Based on data from the American Heart Association, PDA can still be diagnosed in people of all ages, but it is less common in adults. (Source: Patent Ductus Arteriosus: A Contemporary Perspective for the Pediatric and Adult Cardiac Care Provider)

Risk Factors

Several factors can increase a baby’s risk of PDA. Premature birth is one of the main factors, as babies born before 37 weeks of pregnancy are more prone to PDA. In addition, certain infections during pregnancy, such as cytomegalovirus (CMV) infection, may also contribute to PDA. A family history of congenital heart conditions can also increase the likelihood of a baby having PDA. In some cases, the baby’s sex also plays a role; PDA is more common in baby girls than in baby boys.

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Symptoms of Patent Ductus Arteriosus (PDA)

PDA symptoms vary widely, depending on the size of the PDA and how much blood leaks through the open ductus arteriosus.

Symptoms in Babies

Symptoms of Patent Ductus Arteriosus (PDA) in babies can often be seen from birth or within a few weeks afterward. Some common symptoms in babies include:

• Shortness of Breath: Many babies with PDA have trouble breathing, which may show up as a faster breathing rate or breathing that sounds like wheezing.
• Tiring Easily During Feeding: Babies may seem to tire quickly while feeding, making it hard for them to finish a feeding session. They may need to rest more often because of fatigue.
• Poor Weight Gain: If the ductus stays open, the abnormal blood flow can interfere with the baby’s growth and weight gain. In some cases, the baby’s weight may stall or even drop.

The symptoms a baby has can vary depending on the severity of the PDA. In milder cases, the symptoms may not be very noticeable, while in more severe cases, the symptoms can be more obvious and affect the baby’s overall health.

Symptoms in Children and Adults

PDA may not be detected in children or adults until they develop further problems. Some symptoms that may appear include:

• Shortness of Breath: As in babies, children and adults with PDA can also experience shortness of breath, especially during physical activity or after exercise.
• Chest Pain: In some people, chest pain may indicate that the heart is working harder because of the PDA.
• Swelling in the Legs and Ankles: This swelling can be caused by fluid buildup, which can happen when the heart cannot pump blood effectively.
• Extreme Fatigue: People with PDA often feel tired even after light activity, because their bodies do not get enough oxygen-rich blood.

These symptoms can differ from person to person, depending on age, the severity of the condition, and any other health factors that may be present.

When to See a Doctor

Parents and individuals should seek medical care if they notice the following symptoms:

• In babies, if there is significant shortness of breath, difficulty feeding, or if the baby does not gain weight over several days.
• In children or adults, if there is persistent shortness of breath, chest pain, or abnormal swelling in the legs.
• If fatigue becomes excessive or interferes with daily activities, this may be a sign that medical care is needed.

Getting a proper and prompt medical evaluation is very important to determine whether PDA is present and the right way to treat it.

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Diagnosis of PDA

Diagnosing PDA usually involves a combination of a physical examination and imaging tests.

1. Physical Examination

A physical examination is the first step in diagnosing PDA. The doctor will listen to the patient’s heartbeat using a stethoscope. PDA is often marked by a heart murmur, which is a whooshing or extra sound heard because of abnormal blood flow through the open ductus arteriosus.

The location and characteristics of this murmur can help the doctor determine whether PDA is likely. In addition to listening for a murmur, the doctor will also check for other signs such as shortness of breath, an increased workload on the heart, or swelling in the legs and arms. However, a physical examination alone is not enough to confirm a diagnosis of PDA.

2. Imaging Tests

Imaging tests are used to confirm the diagnosis and assess the severity of PDA. These tests include:

• Echocardiography (Echo): Echocardiography is the ultrasound imaging test most commonly used to diagnose PDA. High-frequency sound waves are used to create moving images of the heart. An echo allows the doctor to see blood flow through the ductus arteriosus directly, measure its size, and assess how severe the leak is. The procedure does not cause pain and is relatively quick.
• Chest X-Ray: A chest X-ray (thorax photo) can show enlargement of the heart or of the lung blood vessels, which are signs of PDA. However, a chest X-ray alone is not enough to diagnose PDA, although it can help with the overall assessment. This procedure involves minimal radiation exposure.
• Cardiac MRI (Magnetic Resonance Imaging): A cardiac MRI provides more detailed images of the heart than a chest X-ray. A cardiac MRI can help assess the heart’s anatomy comprehensively and detect other heart abnormalities that may be related to PDA. This procedure does not involve radiation, but it takes longer and the patient must lie still inside the MRI machine. A cardiac MRI is usually used when more detailed information is needed.

3. Other Tests

In addition to a physical examination and imaging tests, other tests may be needed to assess the severity of PDA and other health conditions, such as:

• Electrocardiogram (ECG): An ECG measures the heart’s electrical activity and can help detect heart rhythm abnormalities that may be related to PDA.
• Blood Oxygen Level (Oxygen Saturation): Measuring the oxygen level in arterial blood can show how much oxygen the blood is carrying, which can help assess the severity of PDA.
• Cardiac catheterization: This invasive procedure may be needed in complex cases to assess blood flow in more detail and to carry out treatment, such as closing the PDA via a catheter.

The choice of diagnostic tests will be tailored to the patient’s age, symptoms, and the doctor’s assessment. A combination of a physical examination and imaging tests is generally enough to diagnose PDA.

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Treatment of PDA

Treatment options for PDA depend on several factors, including the patient’s age, the size of the PDA, the severity of symptoms, and the patient’s general health.

1. Medical Treatment

For some cases of Patent Ductus Arteriosus (PDA), especially in premature babies, medications can be used to try to close the ductus arteriosus. COX inhibitors such as ibuprofen or indomethacin are commonly given because they can help stimulate closure of the ductus by reducing the production of prostaglandins, which help keep the ductus open.

However, these medications also carry a risk of side effects that need attention, such as digestive problems, bleeding, and reduced kidney function. Close monitoring by medical staff is needed during and after treatment.

2. Surgical Procedure

If medication is not effective or if PDA is detected at an older age, surgery may be needed to close the PDA. This procedure is usually done as open surgery, by making a small incision between the ribs to reach the ductus arteriosus.

The advantage of this surgery is that PDA closure is generally permanent, which can help reduce symptoms and improve heart function. However, as with other surgical procedures, there are risks such as infection, bleeding, and anesthesia complications. Although rare, serious risks should be weighed carefully before undergoing surgery.

3. Cardiac Catheterization

Another option for closing a PDA is cardiac catheterization, a procedure that is less invasive than open surgery. In this procedure, the doctor uses a catheter, a thin tube inserted through a large blood vessel in the groin, to reach the heart and close the PDA with a special device, such as a coil or an occluder device.

The advantages of cardiac catheterization include a faster recovery and a lower risk of the complications that usually come with surgery. However, there are small risks related to this procedure, such as damage to blood vessels, allergy to contrast dye, and the possibility that the PDA is not completely closed.

4. Treatment Options Based on Age and Severity

The choice of PDA treatment depends greatly on the patient’s age and how severe the condition is. In premature babies, medical treatment is often the first choice. For children and adults with a larger PDA or one that could cause serious complications, surgery or cardiac catheterization is often considered.

In cases where the PDA is small and does not cause symptoms or complications, the doctor may choose to monitor the condition without immediate intervention. This decision is based on a careful analysis of risks and benefits that takes into account each patient’s health and specific circumstances.

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Complications of PDA

If PDA is not treated or not managed properly, several complications can occur, both short term and long term.

Short-Term Complications

Short-term complications that can occur, especially in babies, include:

• Infection: Because of the abnormal blood flow, babies with PDA may be more prone to lung infections or other infections. This is because poorly oxygenated blood can reduce the body’s resistance to infection.
• Bleeding: In some cases, surgery or cardiac catheterization to close a PDA can cause bleeding. Although rare, significant bleeding can occur and require immediate treatment.
• Heart Failure (in Severe Cases): A large, uncontrolled PDA can make the heart work too hard to pump blood, which can eventually lead to heart failure. This is a serious condition that requires immediate care.
• Pneumonia: Abnormal blood flow to the lungs increases the risk of pneumonia.

Long-Term Complications

If PDA is not treated, several long-term complications can occur:

• Heart Failure: The excess workload on the heart from an uncontrolled PDA can lead to heart fatigue and heart failure over time.
• Pulmonary Hypertension (High Blood Pressure in the Lungs): Excessive blood flow to the lungs can cause high blood pressure in the pulmonary arteries, called pulmonary hypertension. This condition can cause permanent damage to the blood vessels of the lungs.
• Endocarditis (Heart Valve Infection): Untreated PDA can increase the risk of endocarditis, an infection of the inner lining of the heart and the heart valves.
• Anemia: In some cases, untreated PDA can lead to anemia, a condition in which there are not enough red blood cells.

The severity of complications depends on the size of the PDA, how quickly it is diagnosed and treated, and the patient’s general health. Early treatment of PDA is very important to prevent serious long-term complications.

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Prevention of PDA

Although Patent Ductus Arteriosus (PDA) is difficult to prevent completely because many of its risk factors cannot be controlled, there are several steps that can be taken to reduce the chance of this condition. These steps mainly focus on the mother’s health during pregnancy and proper medical attention.

• Good Prenatal Care: Comprehensive prenatal care during pregnancy is very important. Regular visits to an obstetrician, monitoring of the health of the mother and fetus, and periodic ultrasound scans can help detect potential problems early, including heart abnormalities in the fetus. Following the doctor’s advice on nutrition, rest, and avoiding unhealthy habits during pregnancy is also very important.
• Treating Infections During Pregnancy: Infections during pregnancy, especially certain infections, can increase the risk of PDA in the baby. Therefore, proper and prompt treatment of infections during pregnancy is very important. Consult your doctor if you develop an infection during pregnancy so you can get the right treatment.
• Managing Existing Medical Conditions: Pregnant women with certain medical conditions, such as diabetes or autoimmune diseases, should work with their doctors to manage these conditions well during pregnancy. Proper management can help reduce the risk of pregnancy complications, including the risk of PDA in the baby.

It is important to remember that in many cases of PDA, the cause is still not fully understood. Although the steps above can help reduce the risk, they do not ensure complete prevention. Early detection of PDA through routine checkups after the baby is born remains the key to proper management and the prevention of complications.

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Conclusion

Patent Ductus Arteriosus (PDA) is a condition in which the blood vessel connecting the aorta and the pulmonary artery in the fetus stays open after birth. This condition can cause abnormal blood flow, straining the heart and lungs. PDA symptoms vary, from no symptoms at all to shortness of breath, fatigue, and growth problems in babies. In children and adults, the symptoms may be more subtle and only appear later in life.

Diagnosing PDA involves a physical examination (listening for a heart murmur), imaging tests (echocardiogram, chest X-ray, cardiac MRI), and possibly other additional tests. PDA treatment depends on the patient’s age, the size of the PDA, and the severity of symptoms. Treatment options include medical treatment (for example, ibuprofen), cardiac catheterization, or surgery. The goal of treatment is to close the ductus arteriosus and restore normal blood flow.

Although there is no sure way to prevent PDA, good prenatal care, treating infections during pregnancy, and managing existing medical conditions in pregnant women can help reduce the risk. Early detection and treatment of PDA are very important to prevent serious short-term and long-term complications, such as heart failure, pulmonary hypertension, and endocarditis. If you have concerns about PDA, consult a doctor promptly to get the right diagnosis and treatment.

If you, your children, or your relatives have symptoms of PDA or have risk factors for heart disease, it is important to consult a doctor or visit Heartology Cardiovascular Hospital to get the proper evaluation and care.

At Heartology Cardiovascular Hospital, the team of cardiologists can explain the condition, the procedures, and the risks and benefits of treatment, and discuss your questions about heart health.