Farrell T A, Hertzberg B S, Kliewer M A, Harris L, Paine S S
Department of Radiology, Duke University Medical Center, Durham, NC 27710.
Radiology. 1994 Nov;193(2):409-11. doi: 10.1148/radiology.193.2.7972754.
To assess the normal range of cerebral ventricular atrial diameters during the second and third trimesters of pregnancy.
The transverse diameter of the atrium of the lateral ventricle was prospectively measured in 739 consecutive antenatal ultrasound examinations by positioning electronic calipers on the luminal margins of the ventricular wall, perpendicular to the long axis of the ventricle.
The mean ventricular atrial diameter for the combined group of all 739 studies was 5.4 mm +/- 1.2 (standard deviation). The transverse diameter of the ventricular atrium did not progressively increase with advancing gestational age. All fetuses younger than 17 menstrual weeks had ventricular atrial diameters less than 8 mm. Four fetuses had ventricular diameters of 10 mm or greater.
A reasonable upper limit of normal for transverse atrial diameter for gestational age of 25 weeks and above appears to be 10 mm. Prior to 25 weeks, diameters over 8 mm are unusual in the healthy fetus and signal the need for a detailed evaluation of fetal anatomy.
评估妊娠中晚期脑室心房直径的正常范围。
通过将电子卡尺置于室壁腔缘，垂直于心室长轴，对739例连续产前超声检查进行侧脑室心房横径的前瞻性测量。
739项研究的所有病例合并组的平均脑室心房直径为5.4毫米±1.2（标准差）。脑室心房横径并不随孕周增加而逐渐增大。所有月经周期小于17周的胎儿脑室心房直径均小于8毫米。4例胎儿脑室直径为10毫米或更大。
孕25周及以上胎龄心房横径正常的合理上限似乎为10毫米。在25周之前，健康胎儿的直径超过8毫米并不常见，这表明需要对胎儿解剖结构进行详细评估。
