瘢痕子宫再次妊娠分娩时机和分娩方式选择的影响因素分析

目的:探讨瘢痕子宫再次妊娠分娩时机和分娩方式选择的影响因素。方法:选取2015年1月—2017年12月于深圳市龙华区人民医院妇产科待产并选择阴道试产的瘢痕子宫再次妊娠孕妇228例为研究对象,根据最终分娩方式分为再次剖宫产组(121例)及阴道分娩组(107例),收集并比较2组孕妇的临床资料。结果:228例孕妇中,107例顺利完成阴道分娩,成功率为46.93%,且所有孕妇均无子宫破裂发生;单因素分析发现,2组孕妇在年龄、文化程度、产前体质量指数(BMI)、距离上次剖宫产时间、阴道分娩史、定期产前检查、使用催产素、瘢痕厚度、现孕周、新生儿体质量等因素间差异有统计学意义(P0.05);多因素分析发现,年龄、产前BMI、距离上次剖宫产时间、阴道分娩史、定期产前检查、瘢痕厚度、新生儿体质量是分娩方式选择的影响因素。结论:瘢痕子宫再次妊娠阴道分娩较为安全,对于35岁以下、BMI30 kg/m~2、距离上次剖宫产时间超过2年、瘢痕厚度≥3 mm、预计新生儿体质量2 500 g且行定期产前检查的瘢痕子宫再次妊娠孕妇可选择阴道分娩。     

瘢痕子宫患者再次妊娠分娩方式的选择与母婴结局分析

目的比较瘢痕子宫患者再次妊娠不同分娩方式对产妇及新生儿的影响,分析自然分娩的风险及注意事项。方法回顾性分析中国人民解放军海军总医院2010年6月至2015年6月收治的瘢痕子宫再次妊娠孕妇436例的资料,根据分娩方式的不同分为瘢痕子宫阴道分娩组172例、瘢痕子宫剖宫产组264例,比较两种分娩方式对产妇及新生儿的影响,按1:1比例选择同期非瘢痕子宫阴道分娩172例及非瘢痕子宫剖宫产产妇264例,分析瘢痕与非瘢痕子宫阴道分娩、瘢痕与非瘢痕子宫剖宫产对产妇及新生儿结局的影响。结果 (1)436例瘢痕子宫产妇,208例行阴道试产,172例试产成功行阴道分娩,成功率为78.6%,228例患者行剖宫产分娩;(2)瘢痕子宫剖宫产组产后24 h出血量、产后发热、新生儿窒息、住院时间明显多于瘢痕子宫阴道分娩组(P0.05);(3)瘢痕子宫阴道分娩组潜伏期、活跃期、总产程、产时出血量、新生儿Apgar评分、新生儿窒息发生率与非瘢痕子宫阴道分娩组差异无统计学意义(P0.05);(4)瘢痕子宫剖宫产组手术时间、住院时间、产后出血量、新生儿窒息、切口愈合不良、产褥感染、盆腹腔粘连发生率明显高于非瘢痕子宫剖宫产组(P0.05)。结论瘢痕子宫剖宫产会明显增加母婴并发症,临床应尽量避免瘢痕子宫无指征剖宫产,排除禁忌证的情况下,鼓励阴道试产,加强产程管理,提高产科质量。     

剖宫产术后瘢痕子宫再次妊娠93例分娩方式探讨

目的:探讨剖宫产术后瘢痕子宫再次妊娠分娩方式的选择.方法:回顾性分析2007年1月1日至2011年10月31日我院收治的剖宫产术后瘢痕子宫再次足月妊娠93例的临床资料,分析瘢痕子宫足月分娩方式的选择.结果:93例孕妇中有38例行阴道试产,试产率为40.86％,试产成功率84.21％ (32/38),再次剖宫产率65.59％(61/93),子宫破裂发生率1.08％(1/93).阴道分娩组的产后24小时出血量及新生儿体重明显低于剖宫产组,差异有统计学意义(P＜0.05);两组孕妇在年龄、孕周、新生儿窒息发生率、产褥病率方面相比较,差异无统计学意义(P＞0.05).结论:对符合阴道分娩条件的剖宫产术后瘢痕子宫再次妊娠孕妇给予阴道试产机会是可行的.     

剖宫产术后再次妊娠分娩方式的探讨

目的:探讨剖宫产术后再次妊娠合理的分娩方式,以期降低再次剖宫产率.方法:收集我院产科2007 ～ 2010年收治的342例剖宫产术后再次妊娠孕妇的临床资料进行回顾性分析,根据妊娠合并的高危因素(胎盘位置异常或子宫切口异常等),分为“高危”瘢痕子宫妊娠组和“普通”瘢痕子宫妊娠组,同时将“普通”瘢痕子宫妊娠组孕妇按照分娩方式分为经阴道分娩组(VBAC组)和再次剖宫产组(RCS组),并对两组的分娩结局、母婴并发症及医疗费用等进行分析.结果:342例孕妇中,“高危”瘢痕子宫妊娠组86例,“普通”瘢痕子宫妊娠组256例,其中VBAC组12例,RCS组244例.RCS组中因社会因素手术者117例,占47.95％;VBAC组孕妇平均出血量、住院时间和住院费用均低于RCS组(P＜0.05).RCS组新生儿因RDS转NICU的发生率、NICU住院时间和平均住院费用均高于VBAC组(P＜0.05).结论:对剖宫产术后再次妊娠者孕期应行详尽检查,筛选出胎盘位置异常或子宫切口异常等“高危”瘢痕子宫妊娠孕妇;其余应合理选择阴道试产,降低因社会因素导致的再次剖宫产率.     

剖宫产后瘢痕子宫再次妊娠阴道分娩孕妇的妊娠结局分析

目的分析剖宫产后瘢痕子宫再次妊娠行阴道分娩(VBAC)的可行性及对孕妇妊娠结局的影响。方法选择江苏省淮安市妇幼保健院2015年3月至2017年12月行剖宫产术后再次妊娠阴道试产(TOLAC)孕妇159例为研究组,分为VBAC组(106例)和TOLAC失败组(53例),并选择同期非瘢痕子宫经阴道分娩孕妇120例为对照组,分析各组分娩结局的差异。结果本组VBAC成功106例,成功率66.67%;和对照组相比,VBAC组孕前BMI指数、引产比例增高、总产程缩短、新生儿出生体重略低(P 0.05);其他指标差异均无统计学意义(P0.05);与对照组、VBAC组相比,TOLAC失败组孕妇的年龄、孕周及孕前BMI指数均显著增高,总产程延长、引产比例、产后出血比例、产后发热比例增高,产后出血量增多、新生儿出生体重较重、住院时间明显延加(P 0.05),但新生儿其他相关指标与VBAC组及对照组相比差异均无统计学意义(P0.05)。结论剖宫产术后再次妊娠产妇经阴道分娩可行,VBAC可减少围产期并发症,降低剖宫产率,缩短住院时间,改善母婴结局。     

闭环式管理对子宫下段横切口再次妊娠孕妇妊娠结局的影响

目的 探讨对剖宫产术后瘢痕子宫再次妊娠阴道试产的孕妇实施孕产期闭环式管理对其分娩结局的影响。方法 选取产检的150例子宫下段横切口剖宫产再次妊娠的孕妇,按照随机数字表法分为对照组与观察组,每组75例。对照组孕妇进行规范孕期保健和产检,观察组孕妇在对照组基础上给予闭环式管理模式。比较两组孕妇产前情况、妊娠结局及新生儿结局。结果 观察组孕期增重、产前体质量指数（BMI）及产前胎儿体重评估明显小于对照组,孕期并发症发生率低于对照组,差异有统计学意义（P<0.05）。观察组产妇剖宫产后阴道试产率、剖宫产后阴道分娩率明显高于对照组,产钳助产术率、中转剖宫产术率、产后24 h出血率、产后住院时间低于对照组（P<0.05）;两组产妇先兆子宫破裂发生率比较,差异无统计学意义（P>0.05）。观察组胎儿窘迫率2.67%、巨大儿发生率0低于对照组的12.00%、5.33%,观察组新生儿出生体重明显小于对照组,差异均有统计学意义（P<0.05）;两组新生儿窒息发生率比较,差异无统计学意义（P>0.05）。结论 对剖宫产术后瘢痕子宫再次妊娠阴道试产的孕妇实施孕产期闭环式管理,有效...     

剖宫产术后瘢痕子宫再次妊娠分娩方式探讨

目的:剖宫产术后瘢痕子宫再次妊娠分娩方式探讨。方法:对我院从2006年1月至2010年12月的剖宫产后瘢痕子宫再次妊娠的孕妇分娩方式、分娩结局及母婴并发症进行分析。将其中再次剖宫产的83例与同期随机抽取首次剖宫产的83例进行对比,将剖宫产后阴道试产成功的48例与同期随机抽取非瘢痕子宫试产成功的48例也进行比较。结果:146例中有63例选择了阴道试产,48例试产成功。剖宫产后阴道试产成功组产程出血、产程时间、新生儿并发症差异无统计学意义P>0.05;再次剖宫产组与首次剖宫产组的产程出血、产程时间及腹腔粘连情况相比差异有统计学意义P<0.05;剖宫产组与阴道分娩组相比产程出血差异有统计学意义P<0.05。结论:剖宫产术后再妊娠分娩不是剖宫产的绝对指征,符合试产条件者,在严密监护下阴道试产也是安全的。     

剖宫产术后瘢痕子宫再次妊娠分娩方式的研究

目的研究剖宫产术后瘢痕子宫再次妊娠分娩的方式。方法选取我院2014年6月~2015年6月收治的剖宫产术后子宫瘢痕妊娠患者100例作为研究对象,将其随机分为观察组与对照组,各50例。观察组患者再次分娩时采用阴道试产,对照组患者继续采用剖宫产,对比两组患者的分娩情况,以及并发症发生情况。结果两组患者均顺利生产,未出现孕妇和胎儿死亡的情况。对比两组分娩后并发症发生率、住院时间和分娩出血量,观察组均明显低于对照组,差异有统计学意义(P0.05),对比两组新生儿Apgar评分,差异无统计学意义(P0.05)。结论对剖宫产术后瘢痕子宫孕妇再次妊娠分娩时选择阴道顺产,疗效显著,并发症发生率较低,值得推广应用。     

剖宫产后再次妊娠经阴道分娩成功的相关因素分析

目的:探讨剖宫产后再次妊娠经阴道分娩成功的相关因素。方法:选取2010年10月至2013年11月在我院住院分娩的剖宫产后再次妊娠且有阴道分娩条件的164例孕妇,分析孕妇的意愿、子宫下段厚度及距前次剖宫产时间等因素。结果:164例中选择经阴试产者96例,其中经阴分娩成功72例,试产成功率75%;二次剖宫产分娩92例。选择经阴分娩的96例孕妇中,子宫下段厚度2.0~2.9mm和≥3.0mm者的经阴分娩成功率显著高于1.0~1.9mm者(79.48%、75.55%vs 58.33%)。距前次剖宫产1~2年、2~3年、3~5年、5~9年及9年以上者分别有1例、46例、35例、12例和2例,其中经阴分娩成功者分别有1例、35例、30例、4例和0例。结论:剖宫产后孕产妇再次分娩方式与孕妇分娩意愿、距前次剖宫产时间、超声测量子宫下段厚度等因素相关,综合因素分析决定无高危因素的剖宫产后再次妊娠经阴道分娩方式是可行和安全的。     

既往分娩史对剖宫产后阴道试产结局的影响

目的:探讨既往分娩史对剖宫产后阴道试产(TOLAC)患者成功率的影响。方法:回顾性分析2013年7月至2016年3月尝试TOLAC的瘢痕子宫孕妇的资料(妊娠≥28周),共506例,其中阴道分娩成功414例(TOLAC成功组),中转剖宫产92例(TOLAC中转剖宫产组)。比较两组前次剖宫产时间、剖宫产指征、阴道分娩史、新生儿存活情况等。结果:TOLAC中转剖宫产组的孕前体质量指数(BMI)及新生儿出生体质量大于TOLAC成功组(P0.05),两组平均妊娠间隔时间比较差异无统计学意义(P0.05),两组在妊娠间隔1年、1~2年、2~3年、3年的比例分别比较,差异无统计学意义(P0.05)。两组的前次剖宫产指征分别比较,差异均无统计学意义(P0.05)。TOLAC成功组有阴道分娩史患者比例明显高于TOLAC中转剖宫产组(P0.05),新生儿未存活的比较差异无统计学意义(P0.05)。结论:既往有阴道分娩史是TOLAC成功的有利因素,而既往分娩史的其他因素对TOLAC的成功率影响较小。     

椎管内分娩镇痛对瘢痕子宫阴道分娩的影响

目的 探讨实施椎管内分娩镇痛对瘢痕子宫阴道分娩产程以及母儿结局的影响.方法 回顾性分析2017年1月至2020年6月在我院定期产检并住院分娩的221例瘢痕子宫患者的临床资料,其中行椎管内分娩镇痛110例,未行椎管内分娩镇痛111例.统计研究对象的一般情况,比较椎管内分娩镇痛对瘢痕子宫阴道分娩的产程及母儿结局影响.结果 ...     

剖宫产术后再次妊娠阴道试产的研究进展

随着生育政策的转变,剖宫产术后再次妊娠孕妇逐渐增多.如何选择分娩方式引起了产科学界的广泛思考与讨论.既往此类孕妇推荐选择性重复剖宫产术作为终止方式,虽可规避子宫破裂风险,但其造成的母体二次损伤及较高的产后出血风险仍不可忽视.近年逐渐推广的剖宫产术后再次妊娠阴道试产及分娩在母儿预后方面展现出更高的价值.通过转变围生保健模...     

Effect of previous vaginal delivery on the risk of uterine rupture during a subsequent trial of labor

OBJECTIVE: We examined the effect of prior vaginal delivery on the risk of uterine rupture in pregnant women undergoing a trial of labor after prior cesarean delivery. STUDY DESIGN: The medical records of all pregnant women with a history of cesarean delivery who attempted a trial of labor during a 12-year period at a single center were reviewed. For the current analysis, the study population was limited to term pregnancies. The effect of previous vaginal delivery on the risk of uterine rupture during a subsequent trial of labor was evaluated. Separate analyses were performed for women with a single previous cesarean delivery and for those with >1 prior cesarean delivery. For each of these subgroups, the rate of uterine rupture among women who had > or =1 prior vaginal delivery was compared with the rate among women with no prior vaginal delivery. Logistic regression analysis was used to examine the associations with control for confounding factors. RESULTS: Of 3783 women with 1 prior scar, 1021 (27.0%) also had > or =1 prior vaginal delivery. During a subsequent trial of labor, the rate of uterine rupture was 1.1% among pregnant women without prior vaginal delivery and 0.2% among pregnant women with prior vaginal delivery (P =.01). Logistic regression analysis controlling for duration of labor, induction, birth weight, maternal age, year of birth, epidural analgesia, and oxytocin augmentation indicated that, among women with a single scar, those with a prior vaginal delivery had a risk of uterine rupture that was one fifth that of women without a previous vaginal delivery (odds ratio, 0.2; 95% confidence interval, 0.04-0.8). In the group of 143 pregnant women with >1 previous cesarean delivery, women with a prior vaginal delivery had a somewhat lower risk of uterine rupture (3.9% vs 2.5%; adjusted odds ratio, 0.6; 95% confidence interval, 0.01-6.7). This difference was not statistically significant. CONCLUSION: Among women with 1 prior cesarean delivery undergoing a subsequent trial of labor, those with a prior vaginal delivery were at substantially lower risk of uterine rupture than women without a previous vaginal delivery.     

瘢痕子宫妊娠早产经阴道分娩的可行性与安全性

目的:探讨瘢痕子宫妊娠早产经阴道分娩的可行性与安全性。方法:选择2012年1月至2016年12月在广州医科大学附属第三医院产科经阴道分娩的瘢痕子宫妊娠早产患者137例为研究组,同时期的瘢痕子宫妊娠早产行剖宫产患者454例为对照组,对两组的分娩结局、母婴并发症及住院时间等进行分析。结果:研究组产后24小时出血量(302.3±173.3 ml)和住院时间(5.01±3.60天)明显少于对照组(358.9±223.6 ml,9.80±6.20天),差异有统计学意义(P<0.05)。研究组与对照组在新生儿死亡、新生儿窒息率、新生儿黄疸、心肌损害、新生儿肺炎、代谢性酸中毒、新生儿呼吸窘迫综合征、入住NICU方面比较,差异无统计学意义(P>0.05)。结论:瘢痕子宫妊娠早产患者经阴道分娩未增加新生儿并发症,母儿获得较好妊娠结局。严格把握剖宫产指征,充分评估病情,瘢痕子宫妊娠早产经阴道分娩是安全可行的,并能减少产后出血量及住院时间。     

剖宫产后再次妊娠自然临产分娩方式的探讨

【摘 要】 目的：探讨剖宫产后再次妊娠孕妇自然临产分娩方式的选择。方法：回顾性研究2015年1月-2016年4月在苏州母子医疗保健中心入院分娩且曾有1次剖宫产史的孕妇共230例。所有孕妇均为足月单胎,头位,自然临产,根据孕妇意愿分为阴道试产（trial of labor after cesarean,TOLAC）组（98例）和拒绝TOLAC组（132例）,TOLAC组根据最终分娩方式分为TOLAC成功组（87例）和TOLAC失败组（11例）。对孕妇的产程管理根据现有规范进行。比较3组的一般人口学特征、前次剖宫产相关因素、母婴结局和社会经济效益。结果：TOLAC成功率为88.78%（87/98）,11例因产时胎心异常或产程停滞中转剖宫产终止妊娠。3组体质量指数（BMI）比较,差异有统计学意义,且TOLAC失败组高于TOLAC成功组和拒绝TOLAC组（均P＜0.05）;其他人口学特征及前次剖宫产相关因素比较,差异均无统计学意义。TOLAC组子宫破裂率与拒绝TOLAC组比较,差异无统计学意义（2.04% vs. 1.52%, χ2=0.091,P=0.767）。3组产时出血量比较差异有统计学意义,且TOLAC成功组明显低于TOLAC失败组和拒绝TOLAC组（均P＜0.05）;3组输血率比较差异有统计学意义,TOLAC成功组输血率明显低于TOLAC失败组,差异有统计学意义（P＜0.05）;TOLAC失败组与拒绝TOLAC组在产时出血量和输血率方面差异无统计学意义（P分别为0.434和0.092）;3组间新生儿入新生儿重症监护病房（NICU）率差异无统计学意义（P=0.23）。3组均未发生子宫切除和母儿死亡等严重并发症。结论：对于前次剖宫产后再次妊娠的孕妇,只要进行充分评估,在合理的监管模式下,TOLAC是一种合理安全的分娩方式,尤其当这些孕妇临产后,阴道分娩可能是比急诊剖宫产更为安全可靠的分娩方式。     

瘢痕子宫再次妊娠不同分娩方式近远期并发症比较

目的:探讨瘢痕子宫再次妊娠不同分娩方式的近远期并发症。方法:选择2002年2月至2017年12月苏州大学附属第一医院妇产科收治的瘢痕子宫孕妇2617例,其中择期再次剖宫产2246例(ERCD组),阴道试产成功334例(VBAC组),阴道试产失败转急诊剖宫产37例(TOLAC失败组)。对3组患者的妊娠结局及产后近远期并发症进行比较分析。结果:3组患者中,TOLAC失败组剖宫产患者并发症发生率最高(18.92%),其次是ERCD组患者(6.99%),而VBAC组患者并发症发生率最低(3.29%)。VBAC组出现输血、产后发热和尿潴留的比例明显低于ERCD组(分别为0 vs 1.65%、1.20%vs 4.14%、0.30%vs 2.98%,P<0.05);发生子宫破裂、输血、尿潴留、肠梗阻的比例低于TOLAC失败组(分别为0 vs 10.81%、0 vs 8.11%、0.30%vs 5.41%、0 vs 5.41%,P<0.05);TOLAC失败组发生子宫破裂、输血、肠梗阻的比例显著高于ERCD组(分别为10.81%vs 0.31%、8.11%vs 1.65%、5.41%vs 0.40%,P<0.05);VBAC组的产妇发生腰痛、肠粘连、贫血、切口部位子宫内膜异位症的比例显著低于ERCD组(分别为0 vs 5.25%、0 vs 4.69%、2.80%vs 7.93%、0 vs 3.91%,P<0.05);3组均无新生儿重度窒息发生,TOLAC失败组轻度窒息发生率(8.11%)明显高于ERCD组(1.02%)和VBAC组(1.20%),差异有统计学意义(P<0.05)。TOLAC失败组1分钟及5分钟Apgar评分均低于ERCD组及VBAC组(1分钟:9.43±1.65分,9.92±0.38分,9.96±0.39分;5分钟:9.64±1.34分,9.98±0.28分,9.99±0.10分),差异有统计学意义(P<0.05),且随访发现,TOLAC失败组1例轻度窒息新生儿发生脑损伤,预后不佳。结论:瘢痕子宫再次妊娠患者,阴道试产成功的母儿并发症最小,择期再次剖宫产次之,试产失败转急诊手术者母儿并发症最高。瘢痕子宫患者在有条件的情况下可以在严密监护下试产,但是需要重视对试产失败患者的处理,以改善母儿结局。     

Sonographic appearance of the uterus in the early puerperium in vaginal versus cesarean deliveries: a prospective study

Purpose: The purpose of this study is to compare uterine sonographic characteristics in early puerperium, following vaginal versus cesarean deliveries; and in women with abnormal third stage of labor, compared to uncomplicated vaginal delivery.

Materials and methods: This is a prospective study of women after delivery of singleton, appropriate-for-gestational-age weight, term neonates; 66 women delivered vaginally and 33 delivered by cesarean section. Sonographic uterine dimensions (height, length, and width), intracavitary thickness and its echogenicity (at level of fundus, midcavity and cervix) were recorded at less than and after 24?h from delivery, and compared between women delivered vaginally and by cesarean section. Among women delivered vaginally, data were further analyzed according to whether women underwent manual revision of the uterine cavity.

Results: Sonographic evaluations were taken at 15.4 (4.3–24.0) and 39.5 (28.8–108.8) hours after delivery (median, range). We found no clinically significant differences in uterine characteristics according to mode of delivery or according to manual revision of the uterine cavity. The sonographic appearance of the uterus was similar when performed at less than or after 24?h from delivery.

Conclusions: Postpartum sonographic evaluation of the uterus appears similar after vaginal and cesarean deliveries.     

Rupture of the scarred uterus

OBJECTIVE: To assess the risk of uterine rupture of the scarred uterus according to mode of delivery in subsequent births recorded as spontaneous labour, labour induced by oxytocin, labour after ripening with prostaglandin E2, and planned cesarean section. METHODS: Retrospective study of 2,128 births with a low transversal scar after a previous cesarean section. The study population was realised in a level III university hospital from 1995 to 2003. The association between mode of delivery and uterine rupture was studied in a multivariate logistic regression model, and adjusted for specific antenatal confounding factors. RESULTS: Over 9 years, we collected 22 cases (1%), including 11 asymptomatic ruptures in a population of 2,128 scarred uteri out of 28,248 deliveries. Uterine rupture occurred at a rate of 0.3 per 100 among women with repeated cesarean delivery without labour, 1 per 100 among women with spontaneous onset of labour, 1.4 per 100 among women with oxytocin-induced labour, and 2.2 per 100 among women with prostaglandin cervical ripening. Compared to women with a planned cesarean section, women with spontaneous onset of labour were more likely to have uterine rupture (OR: 4.0; 95% CI: 0.8-42.0). A greater relative risk was observed among women with oxytocin-induced labour (OR: 4.3; 95% CI: 0.3-60.0), and particularly those with prostaglandin-induced labour (OR: 8.7; 95% CI: 1.5-97.3, p=0.01). CONCLUSION: In women with a scarred uterus, prostaglandin E2 induction of labour is a risk factor for uterine rupture. The practice of a systematic cesarean section in cases with Bishop score<3, appropriate induction procedure, and rigorous monitoring of the labour, could make for a safer delivery.     

Ultrasonographic evaluation of lower uterine segment thickness in patients of previous cesarean section.

OBJECTIVE: To evaluate by ultrasonography, the lower uterine segment thickness of women with a previous cesarean delivery and determine a critical thickness above which safe vaginal delivery is predictable. METHODS: A prospective observational study of 71 antenatal women with previous cesarean delivery and 50 controls was carried out. Transabdominal and transvaginal ultrasonography were used in both groups to evaluate lower uterine segment thickness. The obstetric outcome in patients with successful vaginal birth and intraoperative findings in women undergoing cesarean delivery were correlated with lower segment thickness. RESULTS: The overall vaginal birth after cesarean section (VBAC) was 46.5% and VBAC success rate was 63.5%, the incidence of dehiscence was 2.82%, and there were no uterine ruptures. There was a 96% correlation between transabdominal ultrasonography with magnification and transvaginal ultrasonography. The critical cutoff value for safe lower segment thickness, derived from the receiver operator characteristic curve, was 2.5 mm. CONCLUSION: Ultrasonographic evaluation permits better assessment of the risk of scar complication intrapartum, and could allow for safer management of delivery.