Chapter 2580 【2580】The Defective Wall

Another important reason is that the physical examination items in this era are too simple. In the physical examination that children do in school every year according to the national requirements, the heart examination will at most give you an electrocardiogram and a chest X-ray, and some of them can't even arrange an electrocardiogram. In the absence of detection equipment, let the doctor use a simple stethoscope to listen to the subtle problems in the heart: Well, the doctor who can do this is a fairy.

Besides, the heart disease that can be determined solely by electrocardiogram and chest X-ray is very limited.

To give the simplest example, a 16-year-old girl in bed 12 suffered from atrial septal defect.

This disease can be regarded as a big or small disease. It is very interesting that it is a congenital disease, which means that it is born with abnormalities starting from embryonic development. Next, the strange flower is in adulthood when many cases of this congenital disease are diagnosed, and it becomes a common heart malformation disease in adulthood. Explain what? Explain that it is very difficult to find it, without accurate medical detection equipment. To be precise, a color ultrasound of the heart is needed.

Why can't the electrocardiogram and chest X-ray of this disease be detected in time? To talk about its pathogenesis.

The interatrial septum is like a wall, and it is located between the left atrium and the right atrium. The job of the wall is to block, and what the room divides is the blood of the left atrium and the blood of the right atrium, so that the blood of the two atria cannot communicate.

The disease name of atrial septal defect is more vivid, describing the characteristics of this disease: the wall is defective. The defective wall is manifested as a hole, a number of one, two, or three, or it is directly missing, and the entire wall is missing a piece for you.

Since the cause of this disease is congenital, we should start with how the interatrial septum grows.

In the process of building the wall of the room partition, it is necessary to build an initial wall first, which is called the original wall. If an abnormal missing block occurs during the completion of the primary partition, the gap left is called the primary hole. The original hair hole has been unable to fill, which is called the original hair hole atrial septal defect. This is one type of atrial septal defect.

According to the above statement, the primary diaphragm needs to be completely built, so that the disease will not occur. The problem is that the process of building walls between rooms is built during the fetal period of the baby in the mother's womb.

There is a big problem with building walls during the fetal period: the oxygen and other nutrients that the baby absorbs during the fetal period are obtained through the placenta, not through the lung circulation. Therefore, the right atrium and left atrium of the fetus need to be connected, so that the blood rich in blood oxygen and other nutrients in the placenta can directly flow into the left atrium and left ventricle of the baby, and then go to the whole systemic circulation to nourish the whole body.

In this way, the room partition wall cannot block the entire wall, what should I do?

We had to degenerate a hole in the original wall that was built. This hole grew out later, so it is called a secondary hole.

The secundum is useful to the baby during the fetal period, but it is useless after the baby is born, and problems will arise if it continues to be kept. For this reason, the human body is prepared in advance to block the hole, so another wall called a secondary diaphragm grows on the original wall, which is equivalent to a patch for blocking the hole. At this time, the secondary foramen has another name. Many mothers have heard of this name: it is the famous foramen ovale.

To sum up, in order to maintain the communication between the left atrium and the right atrium during the fetal period, the secondary diaphragm and the primary diaphragm are not fused. In this way, blood can enter the foramen ovale of the right atrium, and then enter the left atrium through the gap between the primary diaphragm and the secondary diaphragm.