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PDA:
Pediatric Closure Device, Pediatric Surgery India, Pediatric Closure Device Surgery, Pediatric Surgery
Cardiology
Patent Ductus Arteriosus treatment and surgery India offers information on Patent Ductus Arteriosus Doctor India, Patent Ductus Arteriosus treatment and surgery Hospital India, Patent Ductus Arteriosus treatment and surgery Abroad, Patent Ductus Arteriosus causes, symptoms, Risk factors, treatment and surgery.

Patent Ductus Arteriosus – Closure Device


What Is Patent Ductus Arteriosus?

Patent ductus arteriosus (PDA) is a heart problem that occurs soon after birth in some babies. In PDA, there is an abnormal circulation of blood between two of the major arteries near the heart. Before birth, the two major arteries—the aorta and the pulmonary artery—are normally connected by a blood vessel called the ductus arteriosus, which is an essential part of the fetal circulation. After birth, the vessel is supposed to close within a few days as part of the normal changes occurring in the baby's circulation. In some babies, however, the ductus arteriosus remains open (patent). This opening allows blood to flow directly from the aorta into the pulmonary artery, which can put a strain on the heart and increase the blood pressure in the lung arteries.

Figure A shows the normal anatomy and blood flow of the interior of the heart. Figure B shows a heart with a patent ductus arteriosus. The defect connects the aorta with the pulmonary artery, allowing oxygen-rich blood from the aorta to mix with oxygen-poor blood in the pulmonary artery. A PDA is a type of congenital heart defect. A congenital heart defect is any type of heart problem that is present at birth. If your baby has a PDA, but has an otherwise normal heart, the PDA may shrink and go away completely, or it may need to be treated to close it. But, if your baby is born with certain types of heart defects that decrease blood flow from the heart to the lungs or the body, medicine may be given to keep the ductus arteriosus open to maintain blood flow and oxygen levels until corrective surgery for the heart defect(s) can be performed. About 3,000 infants are diagnosed with PDA each year in the United States. It is more common in premature infants (babies born too early) but does occur in full-term infants. Premature babies with PDA are more vulnerable to its effects. PDA is twice as common in girls as in boys. The next section, How the Heart Works, provides a more detailed description of a heart with a PDA compared to a normal heart. See that section for a more detailed description of the anatomy and circulation of a normal heart.



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How the Heart Works

Your child’s heart is a muscle about the size of his or her fist. It works like a pump and beats 100,000 times a day.

The heart has two sides, separated by an inner wall called the septum. The right side of the heart pumps blood to the lungs to pick up oxygen. Then, oxygen-rich blood returns from the lungs to the left side of the heart, and the left side pumps it to the body.

The heart has four chambers and four valves and is connected to various blood vessels. Veins are the blood vessels that carry blood from the body to the heart. Arteries are the blood vessels that carry blood away from the heart to the body.


A Healthy Heart Cross-Section

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The illustration shows a cross-section of a healthy heart and its inside structures. The blue arrow shows the direction in which oxygen-poor blood flows from the body to the lungs. The red arrow shows the direction in which oxygen-rich blood flows from the lungs to the rest of the body.


Heart Chambers

The heart has four chambers or "rooms."


Heart Valves

Four valves control the flow of blood from the atria to the ventricles and from the ventricles into the two large arteries connected to the heart.

Arteries

The arteries are major blood vessels connected to your heart.

Veins

The veins are also major blood vessels connected to your heart.
For more information on how a healthy heart works, see the Diseases and Conditions Index article on How the Heart Works. This article contains animations that show how your heart pumps blood and how your heart’s electrical system works.


The Heart With Patent Ductus Arteriosus

The ductus arteriosus is a blood vessel that connects a baby's aorta and pulmonary artery while the baby is in the womb. This connection allows blood to be pumped from the right side of the heart straight to the aorta without stopping at the lungs for oxygen. In the womb, only a small amount of a baby's blood needs to go to the lungs because the baby gets oxygen from the mother's bloodstream. The baby's pulmonary artery, which carries blood to the lungs, is not needed at this time.

After birth, the baby is no longer connected to the mother's bloodstream. The baby's blood must now go to his or her own lungs to get oxygen. Normally, as the baby begins to breathe on his or her own, the pulmonary artery opens to allow blood into the lungs, and the ductus arteriosus closes. Once the ductus arteriosus closes, blood leaving the right side of the heart no longer goes straight to the aorta. First, it goes through the pulmonary arteries and stops at the lungs to pick up oxygen. Then, blood carrying oxygen returns to the left side of the heart and is pumped out to the rest of the body.

If the ductus arteriosus does not close after birth as it should, it is called a patent ductus arteriosus (PDA). A PDA allows blood to flow directly from the aorta into the pulmonary artery and from there to the lungs. This extra amount of blood flowing into the lungs strains the heart and increases the blood pressure in the arteries of the lungs.


Effects of patent ductus arteriosus

Normal birth-weight infants. The larger a PDA is, the greater the amount of extra blood that passes through the lungs. A small PDA might not cause any problems, whereas a larger PDA is likely to cause problems.

PDA can increase the risk of bacterial endocarditis. Bacterial endocarditis is an infection of the lining of the heart, valves, or arteries. In the case of PDA, the increased flow of blood can irritate the lining of the pulmonary artery where the PDA connects. This irritation makes it easier for bacteria in the bloodstream to collect and grow there.

A large PDA that is allowed to remain open for an extended period of time can cause the heart to enlarge and to have to work harder. Also, fluid can build up in the lungs.

Premature infants. For premature infants (babies born too early), PDA can be more serious than in normal-weight babies. Preemies with PDA are more likely to have damage to their lungs from the extra blood flowing through the PDA. Preemies with PDA may need to be on a ventilator to help them with their breathing.

The increased flow of blood through the lungs also can reduce blood flow to the rest of the body. This can damage other organs, especially the intestines and kidneys.


What Causes Patent Ductus Arteriosus?

The cause of patent ductus arteriosus (PDA) is not known.

Genetics may play a role : A defect in one or more genes could prevent the ductus arteriosus from closing normally after birth.

PDA is more common in:


What Are the Signs and Symptoms of Patent Ductus Arteriosus?

A heart murmur may be the only sign that a baby has patent ductus arteriosus (PDA). A heart murmur is an extra or unusual sound heard during the heartbeat.

Some infants may develop signs or symptoms of volume overload on the heart and excess blood flow in the lungs. Signs and symptoms may include:




How Is Patent Ductus Arteriosus Diagnosed?

In full-term infants, a patent ductus arteriosus (PDA) usually is first suspected when the baby's doctor hears a heart murmur during a regular checkup. If a PDA is large, the infant may also develop symptoms of volume overload and increased blood flow to the lungs. When a PDA is small, it may not be diagnosed until later in childhood. Once a PDA is suspected, a consultation with a pediatric cardiologist will be arranged. A pediatric cardiologist is a doctor who specializes in diagnosing and treating heart problems in children.

In premature babies (babies born too early) with PDA, the physical signs that are seen in full-term babies, such as heart murmur, may not be present. Doctors may suspect a PDA in premature babies who develop breathing difficulties soon after birth. Doctors use tests such as echocardiography to look for PDA in premature babies with breathing problems.


Tests

Two painless tests are used to diagnose a PDA.

   Enlargement of the heart chambers
   Other subtle changes that can suggest the presence of a PDA


How Is Patent Ductus Arteriosus Treated?

The goal of treatment is to close the patent ductus arteriosus (PDA) to prevent complications and reverse the effects of increased blood volume.

Small PDAs often close without treatment. For full-term infants, treatment is needed if the child's PDA:


For premature infants (babies born too early), treatment is needed if the PDA is causing increased respiratory distress and heart problems.


Specific Types of Treatment

Treatments for PDA include:

Your child's doctor will discuss the treatment options and your family's preferences regarding treatment decisions.

Medicines

Medicines can be given to help close a PDA.

If a PDA is small and the decision is made not to treat it right away, antibiotics may be prescribed to prevent endocarditis.

Catheter-based procedures

Catheters are thin, flexible tubes used in a procedure called cardiac catheterization (KATH-e-ter-i-ZA-shun). Catheter-based procedures are often used to close PDAs in infants or children who are large enough to have the procedure. Your child's doctor may refer to the procedure as "transcatheter device closure." The procedure is sometimes done on small PDAs to prevent the risk of bacterial endocarditis.

During the procedure, your child will be sedated or given general anesthesia so he or she will sleep and not feel any discomfort. The doctor will place a catheter in a large blood vessel in the upper thigh (groin) and guide it to your child's heart.

A small metal coil or other blocking device is passed up through the catheter and placed in the ductus arteriosus to block blood flow through the vessel.

Catheter-based procedures:


Closing a PDA using a catheter is often done on an outpatient basis. You will most likely be able to take your child home the same day the procedure is done.

Complications of catheter-based procedures are rare and short term. They can include bleeding, infection, and movement of the blocking device from where it was placed.


Surgery

Surgery for PDA may be performed when:

Surgery often is not performed until after 6 months of age in infants who do not have health problems from the PDA. Doctors sometime perform surgery on small PDAs to prevent the risk of bacterial endocarditis.

The operation is done under general anesthesia so that your child will sleep and not feel any pain.

The surgeon will:

Complications of the surgery are rare and usually short term. They can include hoarseness, a paralyzed diaphragm, infection, bleeding, or fluid buildup around the lungs.


After surgery

After surgery, your child will spend a few days in the hospital. Most children go home 2 days after surgery. While in the hospital, your child will be given medicines to reduce pain or anxiety. The doctors and nurses at the hospital will teach you how to care for your child at home.

They will talk to you about:



When your child goes home after surgery, you can expect that he or she will feel fairly comfortable, although there may be some pain temporarily.

Your child should begin to eat better and gain weight quickly. Within a few weeks, your child should be fully recovered and able to participate in normal activities.

Long-term complications from surgical treatment are rare. They can include narrowing of the aorta, incomplete closure of the ductus arteriosus, and reopening of the ductus arteriosus.

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