Around 20 weeks of pregnancy, the expectant mother will face a major test during pregnancy - ultrasonography of the fetal structure. This is often referred to as large row of teratology ultrasound. Today we will talk in detail about what kind of examination is macrodialogic, fetal structure.
Ultrasonography is an important test in the second trimester and usually requires an experienced doctor to do it with a high-grade ultrasound instrument, which can be observed in detail from head to toe to exclude the fetal structure of severe structural malformations. Ultrasound can detect most of the baby's structural malformations, including severe anencephaly developed, severe brain bulge, severe open spina bifida, chest and abdominal wall defects with visceral valgus, and single-cavity cardiac lethal cartilage dysplasia.
These six conditions are something that doctors must check and rule out. The odds of other structural malformations being detected are inconsistent. For example, only about half of heart abnormalities are detected, so why do you have to do this test when you are 20 to 24 weeks pregnant? Because at this stage, the baby's parts are basically developed and formed, but they do not grow too big to form a shield. At the same time, the amount of amniotic water is appropriate at this time, which can form a good contrast, which is the use of ultrasound to obtain high-quality images. It is clear that the baby's growth and development is less than 18 weeks or more than 28 weeks, which is not conducive to observation. Grasp the structure, and after the examination, you may also miss the appropriate prenatal diagnosis time, delaying timely intervention.
Many expectant mothers regard terativation ultrasound as the ultimate artifact, thinking that as long as the orthodontic ultrasound is passed, the baby will be foolproof. But in fact, only about 50% to 60% of the babies in question can be detected by ultrasound. There are two reasons for easy missed tests, on the one hand, because some abnormalities, such as deafness, do not have typical ultrasound performance.
On the other hand, some diseases have only subtle manifestations, and ultrasound may not be able to catch them. Moreover, the amount of amniotic fluid in the baby's position and the weight of the expectant mother will also have an impact on the quality of the inspection image. In addition, ultrasonography is also very subjective, and the experience of ultrasound doctors will also have an impact on the results of the examination, so not all serious deformities will be detected.
Therefore, the big test is not once and for all, even if it passes, it is necessary to do a good job of obstetric examination on time, and carry out other later B ultrasound examinations as needed.
Some expectant mothers will ask, since they may not be able to check it out, is it the same as if they do not do it? First of all, we must have such a concept, the probability of the baby having problems is about 2% to 3.5%, which means that the vast majority of fetuses born will be healthy.
Second, structural ultrasonography, while important, is based on a voluntary basis, as with other tests during pregnancy, and everyone can choose whether to do it or not. If some expectant mothers think that since the baby is healthy and the ultrasound can find half of the problems, then I choose not to do large-row teratology ultrasound.
If your baby is abnormal, I choose to accept it. For this type of expectant mother, it is optional not to do it. But I need to remind everyone to carefully assess the risks and possible outcomes before making a decision. If you can't take the corresponding risk, it is still recommended that you have a large row of deformities.
At present, domestic fetal structure ultrasonography can be divided into secondary prenatal ultrasonography and tertiary prenatal ultrasonography according to different examination contents. The content of the latter inspection is more extensive, and it should be emphasized that the three levels here do not refer to the three-dimensional ultrasound that everyone usually hears, and the several levels of ultrasound refer to the content of the inspection. Several-dimensional ultrasound is about the method of examination, fetal structure, ultrasonography to select tertiary prenatal ultrasonography, the use of two-dimensional ultrasound is sufficient. The two-dimensional ultrasound image is a local facet, that is to say, the images examined are all flat, so that the doctor can correctly understand and interpret.
In order to make the quasi without medical background, the father and mother-to-be can clearly see the baby's appearance. The computer can synthesize a series of two-dimensional images into a three-dimensional image, that is, to make the flat diagram into a three-dimensional diagram. In essence, there is no difference between the two, and the so-called four-dimensional ultrasound that is now very hot is only added to the timeline on the basis of the three-dimensional diagram, so that the image moves.
But in fact, compared to the most basic two-dimensional ultrasound, three-dimensional or four-dimensional ultrasound does not have much medical use value. Fetal structural ultrasound using two-dimensional ultrasound is sufficient. Let's talk about how this test is done. Expectant mothers usually lie flat, and if the doctor needs to cooperate, they may also ask you to turn around and measure the sugar to find a more suitable angle for examination.
There is no need for an empty stomach before ultrasound, nor is there a need to deliberately hold urine or empty the bladder. During the examination, the doctor will apply some gel-like couplant to your stomach, touch your stomach with an ultrasound probe, and move on it to find a suitable fetus. There will occasionally be a hard push in front of you, so rest assured that your baby won't get any harm.
The examination will measure the length of the baby's head, stomach and thigh bones, assess the size of the baby, from head to toe, and observe each part of the baby in detail, including the head, face, spine, limbs and thoracic and abdominal organs, etc., to rule out serious structural deformities. Observe the amount of amniotic water and placenta position, and if necessary, measure the length of the cervix, assess the risk of preterm birth, etc. Sometimes doctors also use Doppler ultrasound, which is a color ultrasound to measure the blood flow of a baby or expectant mother, and the whole process usually takes 30 to 40 minutes.
Finally, what if the results show abnormalities? An obstetrician should first be consulted to evaluate and diagnose some serious structural abnormalities. If the situation after the birth of the baby during pregnancy is considered acceptable by the family, and the expectant mother also hopes to be treated after birth, it can be recommended to be referred to a medical center with conditions to give birth.
If the situation is not expected to be good after the birth of the baby, the expectant mother may consider terminating the pregnancy if she is willing and the conditions are suitable. For some non-specific minor abnormalities, such as the baby's size does not match the gestational age, bilateral renal pelvis is mildly dilated, bilateral lateral ventricular critical widening, etc., it can be reviewed after 2 to 4 weeks and checked regularly according to the specific situation, pay close attention.
Well, today's article is shared here, I hope that we can have the opportunity to become a better self because of the arrival of our children, be better parents, learn to think, learn to judge, learn to analyze, and accompany our children to grow up with him.
This article is original by the little man at home, welcome to pay attention, take you along with long knowledge!