What is the meaning of the length of the top buttock of B ultrasound?
summary
What is the meaning of the length of the top buttock of B ultrasound? Breech position is one of the common abnormal fetal positions. Breech position before 30 weeks of gestation should not be regarded as abnormal; After 30 weeks, most of them could turn to head position naturally, and about 3-4% of them were in breech position continuously. Breech delivery is more dangerous to the fetus, prone to umbilical cord prolapse, fetal arm up, after the emergence of difficulties. It is easy to cause stillbirth, neonatal asphyxia, intracranial hemorrhage and birth injury when the breech position is not handled properly. The perinatal mortality is 3-8 times higher than that of occipital anterior position. The hip position takes the sacrum as the indicator point, and is divided into six positions: left anterior sacral, left transverse sacral, left posterior sacral, right anterior sacral, right transverse sacral and right posterior sacral. According to the types of presentation, it can be divided into single breech position (also known as leg straight breech position), complete breech position (also known as mixed breech position or compound breech presentation) and incomplete breech position.
What is the meaning of the length of the top buttock of B ultrasound?
In all parts of the fetal body, the fetal head is the largest, the fetal shoulder is smaller than the fetal head, and the fetal buttock is the smallest. In cephalic delivery, once the largest fetal head is delivered, the shoulder and buttock smaller than the fetal head will be delivered smoothly without any difficulty. The situation of breech delivery is different. The smallest breech in the fetal body is delivered first, and the largest fetal head is delivered last. Therefore, it is often difficult to deliver the fetal head after the breech and shoulder are delivered. The fetal body has been delivered, the fetal head is still stuck in the vagina, and the fetal "lifeline" from the placenta to the fetal umbilical cord, the umbilical cord, is just squeezed between the fetal head and the vaginal wall. If the fetal head is not delivered within 5-6 minutes after the delivery of the fetal body, it may be due to the long time of umbilical blood flow obstruction and fetal hypoxia, resulting in severe hypoxia and death of the fetus. In the process of pulling out the fetal head, the brachial plexus may be injured by squeezing and pulling, or the excessive shaping of the fetal head may lead to excessive overlap and dislocation of the skull, which may lead to intracranial hemorrhage and other serious consequences.
Breech pregnancy on mother and child what adverse effects? Because of the fetal buttocks, especially incomplete buttocks, the first part of the shape is irregular, can not be as close to the lower uterine segment and cervical orifice as the fetal head, often leaving a gap, prone to premature rupture of membranes; Postpartum uterine atony can occur, so that the process of labor is prolonged, postpartum prone to postpartum hemorrhage. Breech premature rupture of membranes is easy to be complicated with umbilical cord prolapse, the incidence of which is about 10 times of that of head presentation. Premature rupture of membranes can also lead to premature birth and increase neonatal mortality. In the process of breech delivery, the last delivery of the fetal head is often difficult to deliver, resulting in neonatal asphyxia, brachial plexus injury and intracranial hemorrhage, and even stillbirth due to the long delivery time of the fetal head.
Signs: the uterus is oval in shape, the longitudinal axis of the fetus is consistent with that of the mother, the round and hard floating fetal head can be touched at the bottom of the uterus, one side of the abdomen is the fetal back, and the other side is the fetal limbs; If it is anterior sacral position, the fetal back is clear; In the posterior sacral position, the fetal limbs are in the front and the fetal back cannot be clearly touched. Fetal heart sounds are the loudest in the flat or slightly upper part of the umbilicus. If the fetal head is in line with the fetal body and the fetal head is in the middle of the bottom of the uterus, the possibility of single breech position is high.
matters needing attention
The difference between fetal foot and fetal hand is as follows: (1) the toes are short and even, the opening between the toes is small, and the two ends of the toes are not easy to fit together; The fingers are long and open, and the two ends of the fingers are easy to put together; ② The end of each toe can be connected into a straight line, and the connecting line of the finger end can be curved; ③ The heel protrudes, and the heel is perpendicular to the joint (leg).
