Placental implantation at 18 weeks and migration throughout pregnancy

被引:19
作者
Magann, EF
Evans, SF
Newnham, JP
机构
[1] Univ Mississippi, Med Ctr, Dept Obstet & Gynecol, Ob Gyn Publicat Off, Jackson, MS 39216 USA
[2] Univ Western Australia, King Edward Mem Hosp, Women & Infants Fdn, Subiaco, WA, Australia
关键词
D O I
10.1097/00007611-199811000-00006
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Background. We wanted to find the most frequent site of placental implantation at 18 weeks' gestation and placental migration during gestation. Methods. Placental location was identified in 2,526 singleton pregnancies at 18 weeks' gestation and characterized into nine groups. Placental migration in 1,336 of these pregnancies was assessed by serial ultrasonography. Results. At 18 weeks' gestation, posterior, high placental implantation was more common (45.1%) than anterior, high implantation (42.1%). Relocation of posterior, high placentas farther fundally (16.9%) was three times more likely than farther fundal migration of anterior, high placentas (4%). Conclusions. Posterior fundal placental implantation is more common at 18 weeks' gestation than anterior implantation. Posteriorly implanted placentas are more likely than anterior placentas to migrate farther fundally during gestation. The greater relocation of posterior placentas farther fundally suggests a greater growth of posterior versus anterior uterine wall smooth muscle.
引用
收藏
页码:1025 / 1027
页数:3
相关论文
共 3 条
[1]   SIGNIFICANCE OF SITE OF PLACENTAL ATTACHMENT IN UTERUS [J].
BOOTH, RT ;
PINKERTON, JHM ;
BEARD, RW ;
WOOD, C ;
GIBSON, JRM .
BRITISH MEDICAL JOURNAL, 1962, (5294) :1732-&
[3]   EFFECTS OF FREQUENT ULTRASOUND DURING PREGNANCY - A RANDOMIZED CONTROLLED TRIAL [J].
NEWNHAM, JP ;
EVANS, SF ;
MICHAEL, CA ;
STANLEY, FJ ;
LANDAU, LI .
LANCET, 1993, 342 (8876) :887-891