Wladimiroff J W, Bloemsma C A, Wallenburg H C
Am J Obstet Gynecol. 1978 Aug 15;131(8):857-60. doi: 10.1016/s0002-9378(16)33131-3.
Data on consecutive ultrasonic measurements of fetal biparietal diameter (B.P.D.) and fetal chest area in 303 normal and 84 small-for-dates fetuses are presented. Duration of pregnancy varied from 24 to 41 weeks. A normal curve of the fetal B.P.D., chest area, and head-to-chest ratio was constructed. At 24 weeks mean fetal B.P.D. was 6.29 cm., mean fetal chest area was 24.9 sq. cm., and mean head-to-chest ratio was 1.59. At 41 weeks the mean values were 9.81 cm., 92.4 sq. cm., and 1.05, respectively. In the group of small-for-dates fetuses, a normal head-to-chest ratio was almost always associated with early onset of fetal growth retardation whereas in the majority of fetuses with increased head-to-chest ratios, growth retardation appeared to have started only in the third trimester of pregnancy.
本文呈现了303例正常胎儿和84例小于孕周胎儿的胎儿双顶径（B.P.D.）及胎儿胸部面积的连续超声测量数据。孕周从24周变化至41周。构建了胎儿双顶径、胸部面积及头胸比的正态曲线。在24周时，胎儿平均双顶径为6.29厘米，胎儿平均胸部面积为24.9平方厘米，平均头胸比为1.59。在41周时，平均值分别为9.81厘米、92.4平方厘米和1.05。在小于孕周胎儿组中，正常头胸比几乎总是与胎儿生长迟缓的早期发生相关，而在大多数头胸比增加的胎儿中，生长迟缓似乎仅在妊娠晚期开始。
