الفهرس 
Assessment of high risk patients for placenta previa using abdominal ultrasound and color doppler during the third trimester as regarding frequency of occurrence and maternal morbidity
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Abstract
Objective: To determine the frequency of placenta previa and its association with maternal morbidity in high risk patients for placenta previa (previous miscariages (D&C), previous cesarean section, previous placenta previa). Methods:This study included 400 patients divided into two groups .The first group included 200 patients with history of: cesarean section, curettage for miscarriages(D&C),placenta previa .2nd group included 200 patients without history of the risk factors. trandabdominal ultrasound was done for all patients while color Doppler was done in cases of placenta previa only. Differences between women with placenta previa major and minor in the two groups regarding age, parity, gravidity, antepartum hemorrhage, preterm deliveries, emergency cesarean section, abnormal placental adhesions, cesarean hysterectomy, urinary tract injuries, blood transfusion intraoperativelly,ICU admission,maternal mortality were collected and tabulated for comparison. Results: We found that there was a significant difference between the two groups in preterm delivery with p value = 0.046, emergency cesarean section with p- value = 0.002,intraoperative blood transfusion with P-value=0.023. Our study showed a significantly higher frequency of placenta previa in high risk patients10% than the low risk patients3.5% with p-value 0.010 denoting a statistically significant effect. Conclusion: Pregnant women with history of cesarean section, curettage for miscarriage (D&C),previous placenta previa are at high-risk for placenta previa in subsequent pregnancies .Placenta previa in turn increases the risk of maternal morbidity