Changes of Placental Site Diagnosed by Repeated Ultrasonic Examination

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Abstract
Over 2 yr, 7137 localizations of placenta were performed. In 67 patients on the 1st examination the lower margin of placenta reached the internal os of the uterus. All these patients were followed up by examinations every 2-4 wk. In 63 of the 67 patients, placental migration was found involving a change in the level of the lower placental edge from the cervix towards the fundus. The change in this position varied from 3-9 cm. All 4 cases where the placenta extended from anterior to posterior wall ended as placenta praevia. Ultrasonic proof of placental migration showed the necessity for ultrasonic examination shortly before the birth, as only then is the final diagnosis of placenta praevia possible.