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Heart Failure

What is heart failure?

Heart failure, also called congestive heart failure, is a condition in which the heart cannot pump enough oxygenated blood to meet the needs of the body's other organs. The heart keeps pumping, but not as efficiently as a healthy heart. Usually, the loss in the heart's pumping action is a symptom of an underlying heart problem.

What causes heart failure?

Heart failure often occurs in children with congenital (present at birth) heart defects. Other medical problems that can cause heart failure include, but are not limited to, the following:

  • systemic right ventricle (right ventricle is the only ventricle or the right and left ventricles are transposed so that the right ventricle pumps blood out to the body rather than the lungs) that is unable to meet demand
  • inefficient pumping of the ventricles due to enlargement of the heart and/or too much volume in the circulatory system
  • heart valve disease caused by past rheumatic fever or other infections
  • infections of the heart valves and/or heart muscle (i.e., endocarditis)
  • heart valve malfunctions such as regurgitation (improper valve closure) or stenosis (narrowed valve opening)
  • cardiac arrhythmias (irregular heartbeats)
  • cardiomyopathy, or another primary disease of the heart muscle
  • chronic lung disease
  • anemia
  • high blood pressure (hypertension)
  • hemorrhage (excessive bleeding)
  • post-operative complications over time, following repair or palliation procedure(s)

Many congenital heart defects have the potential to lead to heart failure over time, whether or not the defect was treated surgically. Congenital heart defects that more often develop heart failure include, but are not limited to, the following:

  • transposition of the great arteries
  • congenitally corrected transposition of the great arteries
  • tetralogy of Fallot
  • pulmonary stenosis
  • Ebstein's anomaly of the tricuspid valve
  • single ventricle
  • aortic or mitral valve disease

How does heart failure affect the body?

Heart failure can affect the right side of the heart, the left side of the heart, or both sides.

When the right side of the heart begins to function less efficiently, it is unable to pump much blood forward into the vessels of the lungs. Because of the congestion in the right side of the heart, blood flow begins to back up into the veins. Eventually, swelling is noticed in the feet, ankles, eyelids, and abdomen due to fluid retention.

When the left side of the heart fails, it is unable to pump blood forward to the body efficiently. Blood begins to back up into the vessels in the lungs, and the lungs become stressed. Breathing becomes faster and more difficult. Also, the body does not receive enough blood to meet its needs, resulting in fatigue and poor growth.

What are the symptoms of heart failure?

The following are the most common symptoms of heart failure. However, each child may experience symptoms differently. Symptoms may include:

  • visible swelling of the legs, ankles, eyelids, face, and (occasionally) abdomen
  • fast breathing during rest or exercise
  • shortness of breath or labored breathing
  • fatigue
  • a child needing to take frequent rest breaks while playing with friends
  • nausea
  • falling asleep when feeding or becoming too tired to eat
  • lack of appetite
  • weight gain over a short period of time, even when the appetite is poor
  • cough and congestion in the lungs
  • sweating while feeding, playing, or exercising
  • breathing difficulty with activity, especially while feeding, walking, or climbing stairs)
  • loss of interest in feeding (poor appetite, loss of muscle mass, overall weight loss)
  • failure to gain weight
  • swelling around the eyes or over the flanks (between the ribs and the upper border of the hip bone)
  • abdominal distension (enlargement) and/or pain over the right side (liver area)
  • change in skin temperature and color (cold and clammy, or sweaty, flushed, and warm)

The severity of the condition and symptoms depends on how much of the heart's pumping capacity has been affected.

The symptoms of heart failure may resemble other conditions or medical problems. Always consult your child's physician for a diagnosis.

How is heart failure diagnosed?

Your child's physician will obtain a complete medical history and physical examination, asking questions about your child's appetite, breathing patterns, and energy level. Other diagnostic procedures for heart failure may include:

  • blood and urine tests
  • chest x-ray - a diagnostic test which uses invisible electromagnetic energy beams to produce images of internal tissues, bones, and organs onto film.
  • electrocardiogram (ECG or EKG) - a test that records the electrical activity of the heart, shows abnormal rhythms (arrhythmias or dysrhythmias), and detects problems with the heart muscle.
  • echocardiogram (echo) - a noninvasive test that uses sound waves to produce a study of the motion of the heart's chambers and valves. The echo sound waves create an image on the monitor as an ultrasound transducer is passed over the heart.

Treatment of heart failure:

Specific treatment for heart failure will be determined by your child's physician based on:

  • your child's age, overall health, and medical history
  • extent of the disease
  • your child's tolerance for specific medications, procedures, or therapies
  • expectations for the course of the disease
  • your opinion or preference

If heart failure is caused by a congenital (present at birth) heart defect or an acquired heart problem such as rheumatic valve disease, surgical repair of the problem may be necessary. Medications are often helpful in treating heart failure initially. Eventually, medications may lose their effectiveness and many congenital heart defects will need to be repaired surgically. Medications may also be used after surgery to help the heart function during the healing period.

Medications that are commonly prescribed to treat heart failure in children include the following:

  • digoxin - a medication that helps strengthen the heart muscle, enabling it to pump more efficiently.
  • diuretics - helps the kidneys remove excess fluid from the body.
  • potassium-sparing diuretics - helps the body retain potassium, an important mineral that is often lost when taking diuretics.
  • potassium supplements - replaces the potassium lost when taking diuretics.
  • ACE (angiotensin-converting enzyme) inhibitors - dilates the blood vessels, making it easier for the heart to pump blood forward into the body.
  • beta blockers - decrease the heart rate and blood pressure, and improve heart function by blocking the stress hormone adrenalin.

Cardiac resynchronization therapy, or device therapy, is a newer treatment for heart failure. Device therapy uses a type of pacemaker that paces both sides of the heart simultaneously to coordinate contractions and improve pumping ability.

For more specific information regarding heart failure treatment, consult your child's physician.

Click here to view the
Online Resources of Cardiovascular Disorders

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