Congenital heart diseases are defects of the heart and/or great arteries that are present at birth. They may be manifested at birth or hidden until later in life. Cyanosis is an important sign to diagnose and differentiate between types of congenital heart disease. What is the most common congenital heart disease? A- Atrial septal defect B- Ventricular septal defect C- Patent ductus arteriosus D- Transposition of the great arteries E- Tetralogy of Fallot Answer: http://medical-usmle.com/?p=773
