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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.

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.

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

In most cases of congenital heart defect, the cause is thought to be a combination of genetics and environment.

Hypoplastic left heart syndrome (HLHS) is a group of defects of the heart and large blood vessels. A child is born with this condition (congenital heart defect). It occurs when part of the heart doesn't develop as it should during the first eight weeks of pregnancy.

MRI is a procedure that uses a large magnet, radio waves, and a computer to create detailed images of organs and tissues in the body. It’s used to diagnose problems in many areas of the body. Read on to learn about what it means for your child to have an MRI.

A detailed look at STIs and teens, from protection and treatment to different types of STIs.

Information on teen driving, including safety tips.

Adolescence is a stressful time of life even for physically healthy teens. Chronic illness further complicates adolescent development. Read on to learn more.