TRANSVAGINAL SONOGRAPHIC EVALUATION OF FIRST-TRIMESTER PLACENTA PREVIA

被引:10
作者
HILL, LM
DINOFRIO, DM
CHENEVEY, P
机构
[1] Magee-Women's Hospital, Department of Obstetrics, Division of Ultrasound, University of Pittsburgh School of Medicine, Pittsburgh
关键词
TRANSVAGINAL SONOGRAPHY; FIRST TRIMESTER; PLACENTA; INTERNAL CERVICAL OS;
D O I
10.1046/j.1469-0705.1995.05050301.x
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Our objective was to determine the relationship between the placenta and the internal cervical os in the first trimester. This study included ultrasound examinations performed between 9 and 13 weeks' gestation over a 28-month period. The position of the lower edge of the placenta with respect to the internal cervical os was recorded for each transvaginal ultrasound examination. A total of 77 out of 1252 (6.2%) patients had first-trimester placenta previa;four cases persisted until term. There were no false-negative diagnoses. Our conclusion is that approximately 6.2% of patients will have a placenta previa in the first trimester. Transvaginal sonography can exclude a diagnosis of placenta previa after 9 weeks' gestation. The likelihood that a placenta previa will persist until term increases if the placenta covers the internal cervical os by greater than or equal to 1.6 cm.
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页码:301 / 303
页数:3
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