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Abstract Objective: To compare the characteristics of prenatal ultrasound for diagnozing placenta implantation in different pregnant stages, and to analyze its clinical value. Methods: The data of 149 pregnant women with placenta implantation in Weihai municipal hospital were collected from Jan 2010 to Dec 2016. All the included women were divided into early pregnant group (22 cases) and middle or late pregnant group (127 cases). The characteristics of prenatal ultrasound and rate of placenta implantation were compared between the two groups. And the related factors affecting the prognosis of placenta implantation were analyzed. Results: The characteristics of prenatal ultrasonography of placenta implantation in different pregnant stage were different. For early pregnant women, the anterior wall muscle layer was thinner and the gestational sac position was lower, and boundaries of placental and myometrial or cervical tissue was unclear in the middle or late pregnant women. The coincidence rate and accuracy rate of antenatal ultrasonography diagnosing early pregnant placenta increta were 22.7% and 72.7%, respectively, that significantly lower than those of ultrasonography diagnosing middle or late pregnant women, which were 86.6% and 94.5%, respectively. The location of placenta effected the results of ultrasonography diagnosis, and central placenta previa and uterine anterior wall placenta could improve the detection rate of prenatal ultrasound. The rate of postpartum hemorrhage of women with prenatal hemorrhage and central placenta previa were 77.5% and 76.9%, respectively, and the rate of hysterectomy were 37.5% and 26.9%, respectively, which all were the risk factors effected the maternal prognosis. Conclusion: The characteristics of prenatal ultrasonography of placenta implantation in different pregnant stage are very different. The accuracy of diagnosis on placenta implantation for middle and late pregnancy is better than that of early pregnancy. The location of placenta has an effect on the accuracy of ultrasound examination, and it affects maternal prognosis together with prenatal hemorrhage.
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