Senin, 24 Desember 2012

Atrial septal defect (ASD)

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Atrial septal defect (ASD)

Definition  :
Atrial septal defect (ASD)

An atrial septal defect (ASD) is a hole in the wall between the two upper chambers of your heart. The condition is present from birth (congenital). Smaller atrial septal defects may close on their own during infancy or early childhood.

Large and long-standing atrial septal defects can damage your heart and lungs. An adult who has had an undetected atrial septal defect for decades may have a shortened life span from heart failure or high blood pressure in the lungs. Surgery is often necessary to repair atrial septal defects to prevent complications.

Symptoms:

Many babies born with atrial septal defects don't have associated signs or symptoms. In adults, signs or symptoms usually begin by age 30, but in some cases signs and symptoms may not occur until decades later.

Atrial septal defect symptoms may include:
  • Heart murmur, a whooshing sound that can be heard through a stethoscope
  • Shortness of breath, especially when exercising
  • Fatigue
  • Swelling of legs, feet or abdomen
  • Heart palpitations or skipped beats
  • Frequent lung infections
  • Stroke
  • Bluish skin color
When to see a doctor
Contact your doctor if you or your child has any of these signs or symptoms:
  • Bluish discoloration of the skin
  • Shortness of breath
  • Tires easily, especially after activity
  • Swelling of legs, feet or abdomen
  • Heart palpitations or skipped beats
These could be symptoms of heart failure or another complication of congenital heart disease.

Causes:

Doctors know that heart defects present at birth (congenital) arise from errors early in the heart's development, but there's often no clear cause. Genetics and environmental factors may play a role.
An atrial septal defect allows freshly oxygenated blood to flow from the left upper chamber of the heart (left atrium) into the right upper chamber of the heart (right atrium).

There, it mixes with deoxygenated blood and is pumped to the lungs, even though it's already refreshed with oxygen. If the atrial septal defect is large, this extra blood volume can overfill the lungs and overwork the heart. If not treated, the right side of the heart eventually enlarges and weakens. In some cases, the blood pressure in your lungs increases as well, leading to pulmonary hypertension.

Complications:

A small atrial septal defect may never cause any problems. Small atrial septal defects often close during infancy.

Larger defects can cause mild to life-threatening problems, including:
  • Right-sided heart failure
  • Heart rhythm abnormalities
  • Shortened life expectancy
  • Increased risk of a stroke
Less common serious complications may include:
  • Pulmonary hypertension. If a large atrial septal defect goes untreated, increased blood flow to your lungs increases the blood pressure in the lung arteries (pulmonary hypertension).
  • Eisenmenger syndrome. In rare cases, pulmonary hypertension can cause permanent lung damage, and it becomes irreversible. This complication, called Eisenmenger syndrome, usually develops over many years and occurs only in a small percentage of people with large atrial septal defects.
Treatment can prevent or help manage many of these complications.

Atrial septal defect and pregnancy
Most women with an atrial septal defect can tolerate pregnancy without any problems. However, having a larger defect or having complications such as heart failure, arrhythmias or pulmonary hypertension can increase your risk of complications during pregnancy. Doctors strongly advise women with Eisenmenger syndrome not to become pregnant because it can endanger the woman's life.

The risk of congenital heart disease is higher for children of parents with congenital heart disease, whether in the father or the mother. Anyone with a congenital heart defect, repaired or not, who is considering starting a family should carefully discuss it beforehand with a doctor. Some medications may need to be stopped or adjusted before you become pregnant because they can cause serious problems for a developing fetus.


Treatments and drugs:


If your child has an atrial septal defect, your doctor may recommend monitoring it for a period of time to see if it closes on its own, while treating any symptoms with medications. Many atrial septal defects close on their own during childhood. For those that don't close, some small atrial septal defects don't cause any problems and may not require any treatment. But many persistent atrial septal defects eventually require surgery to be corrected.

If your child needs treatment, the timing of it depends on your child's condition and whether your child has any other congenital heart defects.

Medications
Medications won't repair the hole, but they may be used to reduce some of the signs and symptoms that can accompany an atrial septal defect. Drugs may also be used to reduce the risk of complications after surgery. Medications may include those to:
  • Keep the heartbeat regular. Examples include beta blockers (Lopressor, Inderal) and digoxin (Lanoxin).
  • Reduce the risk of blood clots. Anticoagulants, often called blood thinners, can help reduce the chances of developing a blood clot and having a stroke. Anticoagulants include warfarin (Coumadin) and anti-platelet agents, such as aspirin.
Surgery
Many doctors recommend repairing an atrial septal defect diagnosed during childhood to prevent complications as an adult. For adults and children, surgery involves plugging or patching the abnormal opening between the atria. Doctors can do this through two methods:
  • Cardiac catheterization. A thin tube (catheter) is inserted into a blood vessel in the groin and guided to the heart. Through the catheter, a mesh patch or plug is put into place to close the hole. The heart tissue grows around the mesh, permanently sealing the hole.
  • Open-heart surgery. This type of surgery is done under general anesthesia and requires the use of a heart-lung machine. Through an incision in the chest, surgeons use patches or stitches to close the hole.
Medical monitoring
Follow-up care depends on the type of defect and whether other defects are present. For simple atrial septal defects closed during childhood, only occasional follow-up care is needed. For adults, follow-up care may depend on any resulting complications.

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