The human heart is a four-chambered heart, of which the left and right ventricles play the most important role. The vast majority of congenital heart diseases can be treated with what is called “biventricular correction,” which means that the heart can be cured and have the same structure as a normal human. However, a significant number of congenital heart diseases are “univentricular,” meaning that these poor children’s hearts, like those of frogs, have only one working ventricle. In other cases, there is a large septal defect or an imbalance in the position of the heart valves, so that the heart can only work with a mixture of right and left ventricles, which is called “functional univentricular”. The ideal treatment for a single ventricle is, of course, to separate the ventricles into right and left halves, which is called a single ventricle division. However, this type of surgery is first of all only indicated for a very small number of patients with functional single ventricle, and in addition, the postoperative huge septal patch will swing from side to side, severely affecting cardiac function. Therefore, single ventricle seperations are rarely performed in clinical practice. A group of clever cardiac surgeons came up with a brilliant idea, because the whole body blood is divided into two major parts: venous blood and arterial blood, if we leave the single ventricle for pumping out arterial blood and direct the whole body venous blood around the ventricle to the lungs, then it is possible to at least physiologically correct the single ventricle. These clever surgeons include GLEEN, FONTAN, etc. They started with animal tests on dogs and validated their theories, thus creating the so-called bi-directional GLEEN surgery, total cavopulmonary artery anastomosis (FONTAN surgery) and so on. This week, I performed three bidirectional Greene surgeries in one breath, and I was very pleased to see my children turn from purple dolls to rosy babies, and I was deeply impressed by the wisdom of my predecessors. The next article will introduce you to some of the concerns of parents about single ventricle surgery. Zhang Hao, Department of Pediatric Cardiac Surgery, Beijing Fu Wai Hospital