Belfrage P, Fernström I, Hallenberg G
Obstet Gynecol. 1987 May;69(5):747-50.
Two thousand fifty-four women were routinely screened with ultrasound in the tenth to 14th week of pregnancy. The clinical outcome was compared with a group of 1358 gravidas examined selectively with ultrasound. In the test group, 95% of all women had an ultrasound examination early in pregnancy; the corresponding figure in the control group was 50%. Neonatal outcome was similar, but the frequency of labor inductions decreased in the group routinely screened with ultrasound. Induction of labor for suspected postdatism increased the risk for emergency cesarean section in comparison with spontaneous onset of labor. In about 20% of all cases, prediction of the time of delivery was altered according to the ultrasound examination, and analysis of the patients with spontaneous onset of labor showed that ultrasound was a better predictor of the time of delivery than was the last menstrual period.
2054名女性在妊娠第10至14周时接受了常规超声检查。将其临床结局与1358名选择性接受超声检查的孕妇组成的对照组进行比较。在试验组中，95%的女性在妊娠早期接受了超声检查；对照组的相应比例为50%。两组新生儿结局相似，但常规接受超声检查的组引产频率有所降低。与自然发动分娩相比，因怀疑过期妊娠引产会增加急诊剖宫产的风险。在所有病例中，约20%的分娩时间预测根据超声检查结果发生了改变，对自然发动分娩的患者进行分析显示，超声对分娩时间的预测比末次月经更为准确。
