Grannum P A, Berkowitz R L, Hobbins J C
Am J Obstet Gynecol. 1979 Apr 15;133(8):915-22. doi: 10.1016/0002-9378(79)90312-0.
A practical classification of placental maturity changes has been developed based on a review of multiple ultrasound evaluations of placental texture over a 4 year period. This classification grades placentas from 0 to 3 according to specific ultrasonic findings at the basal and chorionic plates as well as within the substance of the organ itself. The placentas of 129 patients were graded according to this system at the time of ultrasound evaluation. Eighty-six patients had placentas classified as Grade 1 or greater and all of these had lecithin-sphingomyelin (L/S) ratio determinations performed. Mature L/S ratios (2.0) were found in 68% of Grade I (21/31), 88% of Grade II (28/32), and 100% of Grade III placentas (23/23). These results suggest a correlation between maturational changes of the placenta as seen by ultrasound and fetal pulmonic maturity as indicated by L/S ratio.
基于对4年期间胎盘质地的多次超声评估结果回顾，已制定出一种实用的胎盘成熟度变化分类方法。该分类根据胎盘基底板和绒毛膜板以及胎盘实质内的特定超声表现，将胎盘分为0至3级。在超声评估时，根据该系统对129例患者的胎盘进行了分级。86例患者的胎盘分级为1级或更高，所有这些患者均进行了卵磷脂鞘磷脂（L/S）比值测定。在I级胎盘（21/31）中，68%的L/S比值成熟（≥2.0）；在II级胎盘（28/32）中，88%的L/S比值成熟；在III级胎盘（23/23）中，100%的L/S比值成熟。这些结果表明，超声所见的胎盘成熟变化与L/S比值所表明的胎儿肺成熟之间存在相关性。
