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Differential diagnosis of abnormal fetal position
1. Fetal position is not correct
The correct order of normal output should come out first from the head. If the lower body comes out first, even the shoulders, arms and other parts come out first, it is called "abnormal fetal position". The most common is the so-called breech position, that is, the buttocks face the cervical orifice and the birth canal. Other positions such as oblique or transverse positions (shoulders or trunk parts face the birth canal) are rare, but their risks are not small. This is only the most rough classification. In fact, when giving birth, only the person who gives birth first to the back of the head is the easiest way to give birth, and other ways are easy to cause more or less danger or prolonged labor process in the production process.
2. Incomplete hip presentation of fetus
Incomplete hip presentation takes one foot or two feet, one knee or two knees or one foot and one knee as presentation. Knee exposure is temporary, and it turns into foot exposure after the start of labor. Rare.
3. Buttock delivery
When normal pregnancy is close to full-term delivery, most fetuses are upside down, and this so-called "cephalic delivery" accounts for 96%; And 3% are buttocks down, which is called "buttock birth".
4. The fetus is exposed with one arm
The fetus with single hip first exposed or straight leg first exposed has both hip joints flexed and both knee joints extended straight, with buttocks as the first exposed. Most. Hip presentation is the most common abnormal fetal position, accounting for 3% ~ 4% of the total full-term delivery. Because the fetal head is larger than the fetal hip, and there is no obvious deformation of the fetal head after delivery, it is often difficult to deliver, and umbilical cord prolapse is more common, which increases the perinatal mortality rate, which is 3 ~ 8 times that of occipital presentation. Sacrum is the indicator point of hip presentation, and there are six fetal positions: left anterior sacral, left transverse sacral, left and right sacral, right anterior sacral, right transverse sacral and right posterior sacral.
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