原本
Tetralogy of Fallot involves four heart defects:
A large ventricular septal defect (VSD)
Pulmonary stenosis
Right ventricular hypertrophy
An overriding aorta
Tetralogy of Fallot is a rare, complex heart defect. It occurs in about 5 out of every 10,000 babies. The defect affects boys and girls equally.