Hemorrhage into the decidua basalis, formed retroplacental hematoma, lead to the separation of the placenta.
出血进入蜕膜基底，形成胎盘后血肿，导致胎盘分离。
The placenta separation was categorized during the third stage labor with ultrasonographic imaging, and quantity of bleeding measured.
结果不同方式胎盘剥离的超声图像显示第三产程的时间和出血量有明显差异。
Methods All 135 patients had spontaneous delivery at term. The placenta separation was categorized during the third stage labor with ultrasonographic imaging, and quantity of bleeding measured.
方法对135例单胎自然分娩的胎盘剥离声像图进行分类，并采用称重法测量第三产程出血量。
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