Congenital heart disease

特許 権利維持 Congenital heart defect (CHD) or congenital heart anomaly[2] is a defect in the structure of the heart and great vessels that is present at birth. Many types of heart defects exist, most of which either obstruct blood flow in the heart or vessels near it, or cause blood to flow through the heart in an abnormal pattern. Other defects, such as long QT syndrome, affect the heart's rhythm.