In view of this, it is impossible for preoperative factors that say that the doctor did not consider the patient's own physical needs.

The doctor used mechanical valves on the patient for the first time, but there was only one reason left: there was no choice.

Biological petals are relatively expensive. Patients can afford to spend money, but the patient may not be able to accept it. For example, buying a very expensive piece of clothing is not suitable for you. It is impossible to wear it. Once again, it means that the disease treats people indiscriminately.

The patient is poor and rich.

The compatibility of biological valves is much better than that of mechanical valves. The postoperative anticoagulant medication only takes half a year, which has this advantage over mechanical valves. It is more friendly to women who want to get pregnant. The problem is the production of biological valves.

The process is subject to physical limitations such as materials, and the finished products are often not as good as mechanical petals, resulting in limited use conditions.

The simplest example is that when the aortic root of the patient in front of him is too thin to less than 19 mm in diameter, to achieve such a small diameter valve, only mechanical valves can achieve the ultimate. If biological valves can achieve the same diameter ten.

There are fewer manufacturers with a size below nine millimeters, and patients and doctors want to carefully select the best product range to become smaller. Not only that, even if the size below nineteen millimeters can be just enough

To the original diameter of the mitral valve, the effective valve area of ​​the biological valve is much smaller than that of the mechanical valve.

What really plays a key role in the human heart is the effective use area of ​​this valve rather than anything else. To describe it specifically, it refers to the area of ​​the valve leaflets in addition to the opening and closing joints.

What are the benefits of a large effective area of ​​the valve? The daily work of the valve leaves is to constantly withstand the blood flow impact caused by the heart and large blood vessels.

When the leaves are closed, the blood flow of the huge waves is washed away by the huge blood flow. The large-area petal leaves are closed tightly, and can withstand huge blood flow impact like a solid large-scale dam.

The hemodynamics of the petal leaves are more important. At this moment, the blood flow rushes out from the heart to nourish other organs in the body. The best effect required should be to open the dam to release floods. The effective area of ​​the petal leaves is large and the gate is opened.

If it is big enough, the blood flow in the heart is like the stored blood in a reservoir to drain thousands of miles, avoiding the residual heart and increasing the burden on the heart, and at the same time, it will not cause the blood flow and nutrition of other organs of the body to be insufficient.

What happens if the effective area of ​​the valve is not large enough? From the above principle, it can be reversed. In clinical practice, valve insufficiency and valve stenosis are common. What are the causes of various symptoms in the body?

There are four valves in the heart of the human body.

Among them, the mitral valve and aortic valve bear the hemodynamic pressure of the systemic circulation on the left atrium and left ventricle. It can be said that the pressure is huge. Compared with the pulmonary valve and tricuspid valve of the pulmonary circulation, the task is heavier, and the status is important.

Something happened.

The mitral valve is more important than the aortic valve and is prone to problems because it is located between the left atrium and the left ventricle, located at the root of the aorta, and its location is relatively tricky. Many patients have a smaller caliber here, which is not as good as the aortic valve.

The position diameter is large, resulting in less room for selectable valve models.
Chapter completed!