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学习笔记 | 前置胎盘

  • 2026-02-24 22:18:30
学习笔记 | 前置胎盘

前置胎盘(placenta previa)是一种严重的产科疾病,无痛性阴道流血是其最典型的警示信号。一旦出现孕晚期阴道流血,必须立即就医。产前经阴道超声检查是诊断前置胎盘的首选方法,关键是观察胎盘下缘与宫颈内口的关系。早期发现、精准诊断和合理管理对于保障母婴安全至关重要。

正常情况下,孕中期胎盘附着于子宫前壁或后壁,两侧达子宫侧壁,向上可覆盖宫底,最下缘不低于子宫下段。

妊娠早期宫腔较小,胎盘绒毛可以附着在子宫下段或宫颈口上方,至孕中期胎盘可随着子宫增大而逐渐向上移动,称为胎盘迁移,孕中期可迁移到正常位置。

如果妊娠28周以后胎盘附着在子宫下段,仍低于胎先露部,下缘达到或者覆盖宫颈内口,则称为前置胎盘。

高危因素包括多次流产史、宫腔操作史、产褥感染史、剖宫产史、多孕产次、双胎妊娠、辅助生殖技术受孕以及子宫形态异常等。

临床上根据胎盘下缘与宫颈内口的关系,将前置胎盘分为四类:

  1. 完全性前置胎盘:胎盘组织完全覆盖宫颈内口。

  2. 部分性前置胎盘:胎盘组织覆盖部分宫颈内口,此为宫颈口张开至3cm时,阴道检查诊断。

  3. 边缘性前置胎盘:胎盘下缘达到但未超越宫颈内口。

  4. 低置胎盘:胎盘最下缘距宫颈内口小于2cm,但未达到宫颈内口。

孕晚期由于子宫下段形成,宫颈管消失,宫口扩张等因素,胎盘边缘与宫颈内口的关系随着孕周可发生改变,因此超声检查的分类与临床分类有所不同,分为前置胎盘和低置胎盘两大类。

  1. 前置胎盘:胎盘覆盖宫颈内口。

  2. 低置胎盘:胎盘最下缘距宫颈内口≤20mm。

【超声扫查方法】可以经腹部、经阴道和经会阴扫查。

  • 经腹扫查,简便安全,但需膀胱适度充盈。膀胱充盈不够时,宫颈显示不清,容易漏诊;过度充盈,则子宫下段受压易误诊为宫颈,导致假阳性。另外,妊娠晚期胎儿先露部下降,影响后壁胎盘与宫颈内口关系的观察,常常漏诊。

  • 经阴道扫查,能够清晰显示宫颈内口与胎盘的位置关系,准确测量胎盘跨过宫颈内口的距离,任何时候怀疑胎盘前置,都建议选择经阴道超声检查。

  • 经会阴扫查,适用于阴道大量出血者。但因扫查深度有限,对低置胎盘和正常位置胎盘观察有限。

【图例】

💡提醒超声医生注意

①在孕早、中期超声检查中发现的胎盘位置低,甚至覆盖宫颈内口。多数病例会发生胎盘迁移,到晚期迁移至正常位置,不宜过早诊断前置胎盘。孕中期发现时,可提示“前置/低置胎盘状态”。

②发现前置胎盘时,应特别注意有无合并胎盘植入。

③发现胎盘位置异常时,应测量胎盘边缘距宫颈内口距离。

④孕中期低置胎盘状态,胎盘边缘距宫颈内口大于10mm时,无需特别复查;胎盘边缘跨过宫颈内口小于25mm时,则应在28周复查,再次明确有无低置胎盘;若跨过宫颈内口部分大于25mm,到了妊娠晚期,基本上仍然是前置胎盘。

References:

《妇产超声诊断学(第2版)》 谢红宁 主编

点亮 ❤一起提升超声诊断能力!👇

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  1. CONNECT:[ UseTime:0.000540s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000877s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000312s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000274s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000665s ]
  6. SELECT * FROM `set` [ RunTime:0.000254s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000778s ]
  8. SELECT * FROM `article` WHERE `id` = 470159 LIMIT 1 [ RunTime:0.000429s ]
  9. UPDATE `article` SET `lasttime` = 1771977388 WHERE `id` = 470159 [ RunTime:0.015157s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000305s ]
  11. SELECT * FROM `article` WHERE `id` < 470159 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000542s ]
  12. SELECT * FROM `article` WHERE `id` > 470159 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004173s ]
  13. SELECT * FROM `article` WHERE `id` < 470159 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013066s ]
  14. SELECT * FROM `article` WHERE `id` < 470159 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004483s ]
  15. SELECT * FROM `article` WHERE `id` < 470159 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001231s ]
0.114183s