Timor-Tritsch I E, Farine D, Rosen M G
Department of Obstetrics and Gynecology, Columbia College of Physicians and Surgeons, New York, NY.
Am J Obstet Gynecol. 1988 Sep;159(3):676-81. doi: 10.1016/s0002-9378(88)80033-4.
Transabdominal sonography has been, for the past two decades, used as an effective diagnostic and research tool in obstetrics. It is predominantly used in the second and third trimesters of gestation. Its use in the first trimester is relatively limited and mostly diagnostic in nature. The introduction of the higher frequency transvaginal transducer probe, with its higher resolution of the images, opens new possibilities to study early gestation. We studied embryonic development in 38 well-dated and normal pregnancies. A well-defined intrauterine gestational sac could be seen at 4 weeks and 1 to 4 days of menstrual age. The beta-subunit of human chorionic gonadotropin level at this time was 450 to 750 mlU/ml. Structures such as the yolk sac, membranes, ventricular system in the brain, musculoskeletal system, and cord were described and illustrated. Textbooks and atlases were used for comparative purposes. High-resolution transvaginal sonography will facilitate first-trimester perinatology.
在过去二十年里，经腹超声检查一直被用作产科有效的诊断和研究工具。它主要用于妊娠中期和晚期。其在妊娠早期的应用相对有限，且大多具有诊断性质。高频经阴道探头的引入，因其图像分辨率更高，为研究早期妊娠开辟了新的可能性。我们研究了38例孕周明确且正常的妊娠中的胚胎发育情况。在月经龄4周零1至4天时，可以看到一个界限清晰的宫内妊娠囊。此时人绒毛膜促性腺激素β亚基水平为450至750 mIU/ml。对诸如卵黄囊、胎膜、脑室内系统、肌肉骨骼系统和脐带等结构进行了描述和图示。使用教科书和图谱进行对比。高分辨率经阴道超声检查将有助于早期围产医学。
