- Research Article
- 10.1093/humrep/deaf097.057
O-057 Does the correction of the cesarean section scar defect improve the outcomes of IVF/ICSI?-A Retrospective Observational Study
- Jun 01, 2025
- Human Reproduction
- D Ramineedi + 2 more +2
Abstract Study question Is the cumulative live birth rate (CLBR) improved by the correction of Cesarean section scar defect (uterine isthmocele) in cases of secondary infertility? Summary answer CLBR in women with isthmocele is not affected by presence of intra-uterine fluid or correction of the defect, in FET cycles. What is known already The recent metanalysis by Busnelli et al 2024 says that LBR is improved following isthmocele repair (either hysteroscopic or laparoscopic)- But CLBR has not been considered in this study and it has a very low quality of evidence. The recent meta-analysis by Vitagliano 2024 and Busnelli 2024 says that isthmocele with intrauterine fluid negatively affects the live birth outcomes in IVF. However CLBR has not been considered in this studies. The retrospective study by Diao et al 2021 says that isthmocele impairs the chances of subsequent pregnancy but the outcomes are unaffected by the presence or absence of intrauterine fluid. Study design, size, duration Retrospective observational single centre study from 2018 to 2024 with a study population of 172. Women with secondary infertility undergoing IVF with uterine isthmocele (n = 72) were the test group and women with previous LSCS without isthmocele undergoing IVF (n = 100) were the control group. Exclusion criteria- Fresh embryo transfer Hydrosalpinx Uterine anamolies Fibroid uterus Endometriosis Previous hysterotomy <22weeks of gestation Patients with no blastocysts available for transfer Participants/materials, setting, methods Controlled ovarian stimulation was done according to hospital’s SOP and freeze all policy adopted. Isthmocele was defined as triangular defect in lower uterine segment of about>/=0.2cm at the site of previous cesarean section scar on transvaginal ultrasonography. When there was persistent intrauterine fluid despite aspiration, isthmocele repair was done. If there was no fluid following aspiration, Frozen embryo transfer (FET) was done. Main results and the role of chance Baseline variables were comparable between both the arms. Endometrial thickness at the time of embryo transfer was more in the control group (9.42+/-1.81 vs 10.55+/-2.20, p = <0.01). The number, grade and day of blastocyst transferred was similar in both groups. Implantation Rate (IR), Clinical Pregnancy Rate (CPR), Miscarriage Rate (MR), Multiple Pregnancy Rate (MPR), Cumulative Live Birth Rate (CLBR) were assessed. Outcomes between Isthmocele(n = 72) and Previous LSCS(n = 100) IR 52(71.2%) VS 67(68.4%)p=0.34 CPR 52(71.2%) VS 67(67.7%)P=0.61 MR 4(5.4%) VS 5(5.1%)P=0.91 MPR 12(16.2%) VS 10(10.1%)P=0.23 CLBR 50(72.5%) VS 63(70.8%) P = 0.07 In women with isthmocele compared to previous LSCS without isthmocele, CLBR was comparable. Outcomes between isthmocele repair done(n = 23) vs not done(n = 49) Intrauterine-fluid– 13(56.4%) VS 22(44.9%)p=0.71 IR-17(73.9%) VS 35(71.4%)p=0.74 CPR-17(73.9%) VS 35(71.4%)p=0.82 MR-1(4.3%) VS 3(6%)p=0.77 MPR-2(8.7%) VS 10(20%)p=0.22 CLBR-16(72.7%) VS 34(72.3%)p=0.97 Therefore, correction of isthmocele did not significantly affect the CLBR and intrauterine-fluid was seen in 56.4% women following repair. Outcomes between isthmocele repair done(n = 23) vs previous LSCS(n = 100) CLBR- 16(72.7%) VS 63(70.8%) P = 0.85 Outcome between isthmocele repair not done(n = 49) vs previous LSCS(n = 100) CLBR-34(72.3%) VS 63(70.8%) P = 0.84 CLBR was not affected whether isthmocele repair has been carried out or not, when compared to women with previous LSCS without isthmocele. Limitations, reasons for caution 1. Relatively smaller sample size. 2. Retrospective design. 3. Details of the cesarean section are not considered. 4. Outcomes were not compared to those with previous normal vaginal delivery but earlier meta-analysis by Vitagliano 2023 says IVF outcomes were unaffected by LSCS when compared to Normal vaginal delivery Wider implications of the findings It is reassuring that isthmocele does not affect the IVF outcomes including CLBR regardless of the presence or absence of intrauterine fluid and correction or non-correction of isthmocele. Further RCTs with larger sample size are warranted to study outcomes of intrauterine fluid in FET cycles with isthmocele. Trial registration number No
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