[Therapeutic tactics in placenta praevia].

Ultrasonic screening of pregnant females revealed 299 cases with placental presentation and the patterns of placenta migrations were established and studied. The area of placental presentation in various periods of pregnancy was estimated, anamnestic risk factors for abnormal progression of the pregnancy were identified, three patterns of placental migration were distinguished: rapid, moderate and slow. A model of placental migration was developed and the pregnancy management was pathogenetically substantiated and defined.