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头位分娩时,胎头不论取枕横位,枕后位或枕前位通过产道,均可发生不均倾势,以枕横位中的前不均倾为多见。前不均倾势危害较大,已逐渐被人们重视,枕后位、枕前位中的胎头不均倾势较少报道。1985年下半年,我们前瞻性观察了75例头位阴道手术产,发现左右不均倾势13例,其中枕前位9例,枕后位5例。现把我们的经验及教训总结如下: (1)胎头左右不均倾势的判断标准:①胎头达S~(+3)后作阴道检查,胎头为枕前位或枕后位,但矢状缝偏向一侧。矢状缝偏向骨盆左侧者为左不均倾势;偏向骨盆右侧者为右不均倾势。②胎儿两耳不在骨盆同一平面上,如先露顶骨同侧的耳朵位置低,易触及,
Head position childbirth, regardless of fetus fetal head transverse position, occiput posterior position or anterior occipital through the birth canal, can occur unevenly pouring to the occipital transverse incision in the uneven prevalent. Uneven before the uneven tendency of great harm, has gradually been valued by people, after the pillow, pillow before the bit less evenly distributed in the first few reports. In the second half of 1985, we prospectively observed 75 cases of vaginal vaginal surgery and found that there were 13 cases of uneven vaginal discharge, of which 9 cases were anterior occipital and 5 posterior occipital. Now we sum up the lessons learned and lessons learned as follows: (1) the unevenness of the fetal head to determine the standard deviation: ① fetal head up to S ~ (+3) for vaginal examination after fetal head or occipital posterior position, However, the sagittal suture to one side. Sagittal suture to the left side of the pelvis for the left is uneven; bias to the right of the pelvis for the uneven right. ② fetal ears are not in the same plane of the pelvis, such as the exposed side of the roof of the ear ipsilateral low, easy to reach,