图示法乐氏四联征:1.室间隔缺损；2.主动脉骑跨；3.肺动脉狭窄；4.右心室肥大。右心室肥大引起右向左分流，导致发绀。
This diagram depicts the features of Tetralogy of Fallot:1. Ventricular septal defect; 2. Overriding aorta; 3. Pulmonic stenosis; 4. Right ventricular hypertrophy. The obstruction to right ventricular outflow creates a right-to-left shunt that leads to cyanosis.