Ylikorkala O, Hartikainen-Sorri A L
Acta Obstet Gynecol Scand. 1977;56(1):63-7. doi: 10.3109/00016347709158342.
During 1969--1974 six hundred and forty-nine external versions were attempted during the last trimester on 491 mothers with fetal malpresentation. The procedure was monitored with ultrasound in 1969--1974. Most of attempts (70.0%) were made during the 32nd-36th weeks. The final version rate after one or more attempt was 76.2%, being lower (67.0%) in nulliparous than parous women (84.6%). The incidence of breech presentation at birth decreased from 4.5 to 2.9% (p less than 0.001). The most serious complication was one premature labor but the infant survived. The perinatal mortality was 2.0% and, after excluding abnormal infants, 0.8%. The combination of external version and the use of ultrasound is a safe method which avoids hazardous vaginal breech delivery and is recommended in obstetric practice.
1969年至1974年期间，对491例胎位异常的母亲在妊娠晚期进行了649次外倒转术。1969年至1974年期间，该操作采用超声监测。大多数尝试（70.0%）在第32至36周进行。一次或多次尝试后的最终倒转成功率为76.2%，初产妇（67.0%）低于经产妇（84.6%）。出生时臀位发生率从4.5%降至2.9%（p<0.001）。最严重的并发症是一例早产，但婴儿存活。围产儿死亡率为2.0%，排除异常婴儿后为0.8%。外倒转术与超声联合应用是一种安全的方法，可避免危险的阴道臀位分娩，建议在产科实践中应用。
