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The atrial septum is the wall between the two upper chambers of the heart (right and left atria). An atrial septal defect (ASD) is an abnormal hole in this wall. ASD is a heart problem that is present at birth (congenital). Read on for details about symptoms, diagnosis, and treatment.

An atrioventricular (AV) canal defect is a congenital heart defect. This means that your child is born with it. These defects may range from partial to complete. These conditions cause oxygen-rich (red) blood and oxygen-poor (blue) blood to mix. This sends extra blood to the child's lungs.

Bacterial endocarditis is an infection of the lining of the heart (endocardium), and the heart valves. It does not happen very often, but when it does, it can cause serious heart damage.

Detailed information on blood tests used to diagnosis heart disease.

Coarctation of the aorta is a heart defect that's present at birth (congenital). It means that the aorta is narrower than it should be. Read on to learn details about the condition.

Cardiac catheterization is a procedure in which a long, flexible tube (catheter) is put into a blood vessel. The doctor then guides the catheter into the heart to find and treat heart problems.

Heart failure is when the heart can't pump enough blood to the body. In children, it is often caused by a congenital heart defect.

Cardiomyopathy is any disease of the heart muscle in which the heart loses its ability to pump blood effectively.

Electrocardiography (ECG) is a simple, fast test to check the electrical activity of your child's heart as blood moves through it.