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孕期超声筛选价值多有争议,回顾性研究认为筛选有益,而随机预测试验的结论正相反。有人评论随机研究试验不能证明B超对所有孕妇行筛选检查的效果。作者做了大规模随机试验以评价无明显指征的中期妊娠妇女Ⅰ期筛选的效果。如能减少过期儿(>294天)引产率(由4至2%)或增加500gm双胎平均体重或延长双胎孕期(25天),则认为筛选有价值。将孕满11周首次检查的4,997例,随机分两组:筛选组(n=2,482)孕15周左右,行B超扫描;对照组(n=2,515)孕19周前未行B超检查,孕19周后未用超声估计孕龄。两组间特征相似,除B超检查不同外均行同样产前检查。筛选组扫描共3,068次
Ultrasound screening during pregnancy more controversial, retrospective study that screening useful, but the results of random prediction test is the opposite. It was commented that randomized studies failed to demonstrate the effect of B-screening screening on all pregnant women. The authors conducted a large-scale randomized trial to evaluate the effect of stage I screening in midterm pregnant women without any significant indication. Screening is considered valuable if the rate of missed labor (> 294 days) can be reduced (from 4 to 2%) or the average weight of twins increased by 500gm or the gestation period of twins increased (25 days). A total of 4,997 pregnant women who were checked for first 11 weeks of pregnancy were randomly divided into two groups: the screening group (n = 2,482) was given ultrasound scan for about 15 weeks; the control group (n = 2,515) Pregnancy was not estimated by ultrasound after 19 weeks of gestation. Similar characteristics between the two groups, with the exception of B-test are the same outside the same prenatal examination. Screening group scans total 3,068