Waldenström U, Axelsson O, Nilsson S
Department of Obstetrics and Gynecology, Falu Hospital, Falun, Sweden.
Obstet Gynecol. 1990 Sep;76(3 Pt 1):336-8.
To study whether the estimated date of confinement (EDC) for women with optimal menstrual histories is predicted best from the last menstrual period (LMP) or biparietal diameter (BPD), 2320 women had the EDC estimated by both LMP and BPD measured sonographically in the second trimester. Those who delivered after the spontaneous onset of labor are reported here. Compared with the EDC calculated from the LMP, the EDC calculated from the BPD was postponed more than 1 week for 406 women (17.5%) and advanced more than 1 week for 56 (2.4%). For these women, the BPD estimate of EDC turned out to be closer to the day of delivery in 264 cases, whereas the LMP estimate was closer in 125 (P less than .001). For 73 women, the estimates were equally good. For 80.1% of the women, the two estimates of EDC differed by 1 week or less; in these cases, the estimates were equally good in predicting the day of delivery. We conclude that the BPD is a better predictor of the spontaneous onset of labor than is the LMP.
为研究对于月经史正常的女性，根据末次月经日期（LMP）还是双顶径（BPD）能更好地预测预产期（EDC），对2320名女性在孕中期通过超声测量LMP和BPD来估算EDC。本文报告那些自然发动分娩后的情况。与根据LMP计算的EDC相比，根据BPD计算的EDC有406名女性（17.5%）推迟超过1周，56名女性（2.4%）提前超过1周。对于这些女性，BPD估算的EDC在264例中更接近分娩日期，而LMP估算的EDC在125例中更接近（P小于0.001）。对于73名女性，两种估算同样准确。对于80.1%的女性，两种EDC估算相差1周或更少；在这些情况下，两种估算在预测分娩日期方面同样准确。我们得出结论，与LMP相比，BPD是自然发动分娩更好的预测指标。
