Another important reason is that the physical examination items in this era were too simple. Every year, children will get an electrocardiogram and a chest x-ray for their heart examinations. Some of them cannot even arrange an electrocardiogram.

.In the absence of instrumentation testing, doctors use simple stethoscopes to try to hear subtle problems in the heart: Well, doctors who can do this are immortals.

Besides, heart disease that can be determined by electrocardiograms and chest x-rays alone is very limited.

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

This disease is considered a disease that can be big or small. What is interesting is that it is a congenital disease, which means it is born with abnormalities starting from embryonic development. Next, there are many cases of this congenital disease.

The diagnosis is in adulthood, which becomes a common heart malformation disease in adulthood. What does it mean? It means it is difficult to find it, and it is not possible to do without accurate medical detection instruments. To be precise, a cardiac ultrasound is required.

Why can't this disease be detected in time by electrocardiogram and chest X-ray? Let's talk about its pathogenesis.

The room septum is similar to a wall. I know that it is located between the left atrium and the right atrium. The work of the wall is blocking, and the room septum blocks the blood of the left atrium and the blood of the right atrium, making the blood of these two atriums

Not connected.

The disease name of the atrial septal defect is more vivid, describing the characteristics of the disease: the wall is defective. The defective wall is either a hole, one, two, three, or directly missing. The entire wall is given.

You're missing a piece.

Since the cause of this disease is congenital, it starts with how the atrial septum grows.

During the process of building the room partition, an initial wall needs to be built first, called the primary wall. If an abnormal block occurs during the process of building the primary partition, the gap left behind is called the primary hole.

If it cannot be filled in, it is called the primary hole of the atrial septal defect. This is one of the types of diseases of atrial septal defect.

According to the above statement, the primary diaphragm needs to be built intact so that it will not cause illness. The problem is that the process of building a room septum wall is built in the mother's uterus during the fetal period.

There is a big problem with building walls during the fetus: the oxygen and other nutrients absorbed by the baby during the fetus are obtained through the placenta, not through the pulmonary circulation of the lungs. Therefore, the right atrium and left atrium of the fetus need to be connected so that the placenta is rich in blood oxygen and other nutrients.

It can flow directly into the baby's left atrium and left ventricle, and then go to the entire circulation to nourish the whole body.

In this way, the entire wall cannot be blocked from being blocked by building a room partition. What should I do?

I had to degenerate a hole in the original wall built. This hole grew from behind, so it was called a secondary hole.

Secondary holes are useful to the baby during the fetal period, but are useless after the child is born, and they will continue to be kept for problems. The human body has prepared to block the hole in advance, so another wall grows on the original wall.

Secondary diaphragm, this secondary diaphragm is equivalent to a patch tablet that blocks the hole. At this time, the secondary diaphragm has another name. Many mothers have heard of this name: it is the famous foramen ovale.

To sum up, in order to maintain the connection between the left atrium and the right atrium during the fetus, the secondary diaphragm and the primary diaphragm are not integrated. In this way, blood can enter the foramen ova in the right atrium and then go through the gap between the primary diaphragm and the secondary diaphragm.
Chapter completed!