University Obstetrics and Gynecology Unit, De Soyza Hospital for Women, Colombo, Sri Lanka.
Int J Gynaecol Obstet. 2009 Nov;107(2):140-2. doi: 10.1016/j.ijgo.2009.05.022. Epub 2009 Aug 13.
To compare the accuracy of transvaginal (TVS) versus transabdominal (TAS) ultrasound to assess the thickness of the lower uterine segment (LUS).
Eighty-three pregnant women admitted for an elective cesarean delivery were enrolled. LUS thickness was measured using both TVS and TAS prior to the cesarean. The actual thickness of the LUS was measured using a sterile metal ruler after the neonate had been delivered.
Seventeen women had unscarred uteri (20.1%); 41 had had one previous cesarean (49.4%); and 25 had had two previous cesareans (30.1%). Mean thickness of the LUS measured after delivery was 7.58+/-1.3 mm in unscarred uteri; 5.09+/-1.4 mm for one cesarean; and 3.92+/-1.1 mm for two cesareans (P<0.01). Actual thickness of the LUS showed a significant correlation with TVS among the total (r(s)=0.89); with unscarred uteri (r(s)=0.68); with 1 cesarean (r(s)=0.89); and 2 cesareans (r(s)=0.68), while with TAS the correlations were significant only with the total (r(s)=0.53) and 2 previous cesareans (r(s)=0.63) (P<0.01).
TVS is a more accurate method of assessing the thickness of the LUS compared with TAS.
比较经阴道超声（TVS）与经腹部超声（TAS）评估子宫下段厚度的准确性。
纳入 83 例因选择性剖宫产而入院的孕妇。在剖宫产前，使用 TVS 和 TAS 测量子宫下段厚度。在新生儿娩出后，使用无菌金属标尺实际测量子宫下段厚度。
17 例为无瘢痕子宫（20.1%）；41 例有 1 次剖宫产史（49.4%）；25 例有 2 次剖宫产史（30.1%）。产后测量的子宫下段平均厚度分别为无瘢痕子宫 7.58+/-1.3mm；1 次剖宫产为 5.09+/-1.4mm；2 次剖宫产为 3.92+/-1.1mm（P<0.01）。总子宫下段实际厚度与 TVS 具有显著相关性（r(s)=0.89）；与无瘢痕子宫（r(s)=0.68）；与 1 次剖宫产（r(s)=0.89）；与 2 次剖宫产（r(s)=0.68），而与 TAS 仅在总子宫下段（r(s)=0.53）和 2 次剖宫产史（r(s)=0.63）有显著相关性（P<0.01）。
与 TAS 相比，TVS 是一种评估子宫下段厚度更准确的方法。
