Analysis of b-ultrasound in pregnancy full

B-contribution of

In the medical field, b-ultrasound for the diagnosis of the disease has made distinguished achievements. Especially in obstetric, it to intuitive to display embryo in Palace within development of full process, since stopped by v Monday until entire clinical pregnancy period, are available Ultrasonic explicit like made effective of diagnosis, get fetal heart, and FM of information early Yu other check, not only is confirmed pregnancy of pursuant to, and can identification embryo is survival, in the advanced pregnancy can provides growth development of information, on some fetal malformation and the placenta of form and location exception,, ultrasonic diagnosis can made diagnosis, color more general Doppler ultrasonic can by detection fetal umbilical artery, fetal body renal artery, brain artery, large vascular of blood flow parameter, can assessment placenta of function, fetal is has Palace within hypoxia asphyxia,. Development of Interventional ultrasound, makes early pregnancy villi of lessons learned, and amniotic fluid of umbilical cord puncture location is more safe and reliable. Ultrasonography has become indispensable in obstetric clinical means. Almost every pregnant woman has experienced b-ultrasonography.

Questioned on the b-

However, as the aristogenesis concept, medical, social, family, and those waiting for MOM and Dad\'s parents, of obstetrics in the b-this the most widely used means of checking security questioned. B-ultrasound on fetus secure? B-conclusion reliable? Doctors sometimes does not completely so that prospective parents satisfied with the explanation, on the specious argument on some media, prospective parents \' concerns cannot feel relieved, some prospective parents in contradictions: don\'t do it, for fear of a problem with the baby in the belly; do it, fear of injury in abdominal baby. To this end, I would like to more comprehensive information as possible about the knowledge, mainly of the mother during pregnancy may experience practical problems do tell, academia on the safety of b-ultrasound research.

B-ultrasound on fetus actually had no injuries, no authoritative findings in the medical field, can be described as controversial, most scholars believe that b-ultrasonography on fetal harm not sure. Principle analysis on b-, b-scan ultrasonic conduction is, there is no ionizing radiation and electromagnetic radiation, is a sound wave transmission, this Sonic organization no harm to the human body. But if Sonic density in a fixed place, and gathered a lot of time, there will be heating effect, when this heat effect up to a certain extent, might have an adverse effect on human tissue, affecting intracellular substances, including chromosome. Theory of high intensity ultrasonic through its high temperature and its effect on organizations of cavity, damage to organizations. But in fact, the medical use of b-ultrasound is of low intensity, less than 94 MW/cm, is no harm to the fetus, yet no b-ultrasonography of fetal abnormalities caused by reporting. At present, the hospital use of b-ultrasonography in obstetrics to the fetus is safe.

However, this does not mean that the entire b-ultrasonography during pregnancy can feel free to do, without limits of time and frequency. There are scholars have done the experiment, on 11-12 weeks of fetal eye lens and cornea of b-ultrasound irradiation, have found no radiation, no impact, exposure, five minutes, mild edema in the cornea or lens, exposure, ten minutes, edema than exposure to some five minutes, but reversible, stop after exposure to return to normal. If the exposure time of more than 20 minutes, change is not reversible. Therefore, scholars suggested that time should not exceed five minutes of a b-.

Scientists also study found that, at least within three months of pregnancy on fetal ultrasound examination is harmful. In 1994, Canada medical scientists of the large number of language developmental disorder children study found that child\'s speech development retardation with prenatal b-relevant. 1997 Germany medical studies suggest that bones of the fetus of pregnant three months more sensitive to high temperature, ultrasonic prenatal checks can cause fetal bone damage. If a high fever for ultrasonic examination of pregnant women, more dangerous.

Sweden scientists said there is evidence, for b-ultrasonography during pregnancy may affect fetal brain development. Their conclusion is based on: received ultrasonic irradiation of baby boy, a high proportion of left-handed. They believe that baby ultrasonic perspective in the process of the central nervous system is likely to be affected. However, kaluolinsika a Professor of the Institute of the Stockholm hopes don\'t study and refused to accept the ultrasonic examination of pregnant women. He said there has been no evidence that the infant brain damage.

Who proposed, in using ultrasound only when necessary, without good reason, should not be subject to exposure of fetus. United States ultrasonic body: not as a means of early pregnancy diagnosis of b-.

Effectiveness of b-ultrasonography

Monitor fetal growth: people familiar with the more familiar is the measurement of fetal parts, such as determination of fetal head to the length of the fetal buttocks, commonly used in the early weeks of pregnancy to determine fetal, determination of fetal head the biparietal diameter, head circumference, abdominal circumference and fetus femur length to determine fetal growth and development of the situation. Actual measured values of a fetus, if less than 1000th, No. 9000 or higher, is clearly not normal. In addition, behind normal fetal growth and development of, and sometimes also need to measure the proportion of body parts, such as the proportion of head circumference and abdominal circumference, better have a good understanding of fetal growth.

Observation fetal of physiological activities: obstetric doctor only from abdominal wall outside by touch diagnosis of method, to feeling fetal of size and the fetal position, by virtue of stethoscope to heard fetal of heartbeat, using fetal heart guardianship instrument records fetal heart rate of changes, above observation fetal of physiological phenomenon is does not intuitive of, b Super makes we to intuitive to see fetal in maternal within of activities status, as: respiratory situation, fetal of movement, including entire body large of movement, limb of movement, fetal of swallowing action,, fetal of tension is good, dang fetal in Palace within hypoxia was damage Shi, these activities on will obvious to reduced or disappeared, currently these fetal physiological activities of observation has widely to for clinical, to forecast fetal of safety.

Measurement of amniotic fluid: b-

More accurately measure amniotic fluid. Amniotic fluid is very important for fetal growth, too much or too little amniotic fluid, may indicate fetal abnormality, in each ultrasound reporting form, doctors will record numeric value of amniotic fluid, exceeded this number 2~8 cm is within the normal range.

Understand the situation the placenta: structure of placenta, placental maturity, there is no separation between the placenta and uterine wall, bleeding, it is very important. B-mode ultrasound can clearly understand the position of the placenta is normal, placental vascular tumor-free existence of placental maturity, placenta is consistent with the relationship between gestational age, there is no presence of bleeding between the placenta and uterine wall, you can explicitly diagnosed with placenta previa, Abruptio placenta and other dangerous situations exist, for clinicians to make the correct diagnosis is very important.

Found that fetal malformations: b-ultrasonography is to discover an important means of fetal malformations, General in the 18-20 pregnancy week is free to do b-ultrasound screening for fetal malformations, because the various organs of the fetus has been set, b-easy to see that there are no anomalies. If found during fetal abnormalities, easy termination of pregnancy, so this time b-ultrasonography is very important, such as gastrointestinal malformations, neural tube defects, such as no brains, such as spina bifida. Use resolution clear of b-ultrasonic devices, more small limbs that can be diagnosed with fetal malformations, cleft lip and palate.

What should be done under b-ultrasound

· Early pregnancy there is vaginal bleeding, exclude ectopic pregnancy, threatened abortion, hydatidiform mole.

· When does not match the number of weeks of pregnancy and abdominal size, understanding fetal development situation, do you have embryonic diapause.

· Understanding fetal malformations, should do in the 18-20 pregnancy week.

· Understanding of fetal growth, fetal intrauterine growth retardation, late in the pregnancy.

· Before labor estimating fetal size, determines whether to vaginal delivery.

· If suspected fetal position not being detected, and when there is no determined, by b-ultrasonography to help diagnose.

· Pregnancy than expected date, through b-ultrasound fetal and amniotic fluid, placenta.

How many times do during pregnancy b-suitable

How many times do b-fit during pregnancy? Women at this according to the case may be.

If everything works, then the entire pregnancy during pregnancy do 1-2 b-check on it. So, when is the first b-for more would be good? This is also the concern of many pregnant women, to health of the fetus, if there are no special circumstances, the best in the 18-20 pregnancy week ultrasound examination for the first time, during this period, various organs of the fetus has been fully, b-check carefully, you can see every important organs are no exception. Early detection of fetal malformations, termination of pregnancy in a timely manner, less effects on the body of the mother. Later, if there are no exceptions, you can wait until the final weeks of pregnancy and then the second b-ultrasonography, estimation of fetal size, understand the position of the placenta and amniotic fluid.

If suspected intrauterine growth retardation, through a number of b-ultrasonography can be well clear of treatment effect, late pregnancy if the amniotic fluid reduces, you need multiple b-ultrasonography, because less amniotic fluid, fetal hypoxia, birth asphyxia occurs when the greater the possibility.

At present most countries favour of b-ultrasonography in normal pregnancy do 1-2. Exactly how many b-needs to be done during pregnancy should be based on the case may be, if it is not necessary, don\'t do frequent b-ultrasonography, especially not to b-to identify foetal gender, because identification of fetal sex needs a relatively long time irradiation part, this may be due to the thermal effect of b-ultrasound, bring harm to the fetus. Legally speaking, if there is no medical indication, to do it by b-ultrasound of fetal gender identification and artificially selecting a gender of fetuses was illegal.