When a cesarean section scar is more than an innocent bystander in a subsequent pregnancy: Ultrasound to the rescue

Early first-trimester transvaginal ultrasound screening for cesarean scar pregnancy in patients with previous cesarean delivery: analysis of the evidence

Obstetric hemorrhage is a leading cause of maternal morbidity and mortality. An important etiology of obstetric hemorrhage is placenta accreta spectrum. In the last 2 decades, there has been increased clinical experience of the devastating effect of undiagnosed, as well as late diagnosed, cases of cesarean scar pregnancy. There is a growing body of evidence suggesting that cesarean scar pregnancy is an early precursor of second- and third-trimester placenta accreta spectrum. As such, cesarean scar pregnancy should be diagnosed in the early first trimester. This early diagnosis could be achieved by introducing regimented sonographic screening in pregnancies of patients with previous cesarean delivery. This opinion article evaluates the scientific and clinical basis of whether cesarean scar pregnancy, with special focus on its early first-trimester discovery, complies with the accepted requirements of a screening test. Each of the 10 classical screening criteria of Wilson and Jungner were systematically applied to evaluate if the criteria were met by cesarean scar pregnancy, to analyze if it is possible and realistic to carry out screening in a population-wide fashion.

Cesarean scar pregnancy: Reproductive outcome after robotic laparoscopic removal with simultaneous repair of the uterine defect

OBJECTIVE

To describe perioperative adverse events, fertility and obstetric outcome, following a robot assisted laparoscopic approach for treating Cesarean scar pregnancies (CSP).

STUDY DESIGN

A retrospective case series of 14 consecutive women with a CSP and a wish for and attempts towards subsequent pregnancies, having undergone minimal invasive surgical treatment at two tertiary referral Swedish centers (Dep's of Obstetrics and Gynecology Skåne University Hospital, Lund, and Södersjukhuset, Stockholm) between 2008 and 2019. The surgery was performed by temporary intraoperative occlusion of the uterine blood supply, removal of the CSP and repair of the niche, by the use of robot assisted laparoscopy (Da Vinci surgical robot, Intuitive Surgical, Sunnyvale, CA).

RESULTS

All surgeries were uneventful with a median bleeding of 75 mL. One woman had a postoperative Clavien-Dindo complication grade IIIa (hysteroscopic resection of an isthmic synechiae). During follow up nine women (64 %) conceived naturally; eight of these had an uneventful pregnancy and a full-term Cesarean delivery and one had recurrent CSP and Cesarean with simultaneous hysterectomy in gestational week 33.

CONCLUSION

A robotic removal of a CSP with simultaneous repair of the defect is a feasible option with acceptable reproductive outcome and should be considered when counseling women with a wish for future childbirth in cases of a live CSP and a thin, or absent, myometrium in the niche. A temporary intraoperative occlusion of the uterine blood supply may be useful in cases of live pregnancies and/or high serum β-hCG levels.

Prediction of Delivery Complications by First-Trimester Ultrasound Measurement of the Gestational Sac's Distance From a Previous Cesarean Section Scar

OBJECTIVES

This study was designed to investigate the clinical relationship between labor complications in the second and third trimesters and the distance from the gestational sac to a previous cesarean section (CS) scar.

METHODS

We conducted a retrospective review of the electronic medical records and included all 7- to 9-week transvaginal ultrasound examination reports from pregnancies with a history of a single cesarean delivery in our hospital between January 2015 and December 2017. Women were divided into 6 groups according to the distance of the gestational sac to the CS scar (groups A-F). A composite of pregnancy outcomes (gestational age at birth, delivery mode, placental abnormality, blood loss, uterine rupture, and hysterectomy) and other maternal and neonatal outcomes were assessed.

RESULTS

A total of 699 cases were included in our study. The median gestational age was 39.0 (range, 38.1-39.9) weeks. The median intrapartum blood loss volume was 400 (range, 300-500) mL. The results showed no statistically significant difference in blood loss (P = .297) or birth weight of the neonate (P = .318) among the distance subgroups. Overall, the fetuses were stillborn in 9 of 699 cases (1.29%). There was a statistically significant difference in a morbidly adherent placenta, placenta previa, and preterm labor, and their incidence increased with decreasing distance (P < .001; P for trend < .05). There was no statistically significant difference in uterine rupture (P = .597) or the delivery mode (P = .187) among the subgroups.

CONCLUSIONS

The relative positions of a CS scar and the gestational sac in the first trimester are associated with the incidence of placental abnormalities. As the distance decreases, the extent of a morbidly adherent placenta increases.

Cesarean Scar Pregnancies: Incidence and Factors Associated with Conversion to Surgery from Medical Management

STUDY OBJECTIVE

To describe the incidence, management, and complications of cesarean scar pregnancy (CSP) and define risk factors for conversion from medical to surgical treatment of CSP.

DESIGN

Retrospective clinical study (Canadian Task Force classification II-3).

SETTING

Tertiary medical center.

PATIENTS

All patients who were admitted and treated for CSP between 2008 and 2016.

INTERVENTIONS

The cohort was divided according to management, and demographic, clinical, and sonographic data were collected. Rates of conversion were compared between groups, and risk factors necessitating conversion were sought.

MEASUREMENTS AND MAIN RESULTS

Forty-six cases of CSP were identified. The incidence of CSP has increased from 0.05% to 0.09% of all deliveries. A regression model for absolute numbers of CSP predicted an additional 0.47 CSP each year (p = .03). The most common treatment modalities were systemic treatment with methotrexate (28.2%) and ultrasound-guided intrasac injection of KCl with systemic treatment of methotrexate (58.7%). The mean sac diameter (MSD) of cases that were converted was 11.2 mm larger than in cases that were not converted (p < .001). No patients with an MSD <10 mm or a trophoblastic mass <20 mm³ were converted to surgical management. Maximal levels of beta human chorionic gonadotropin (β-hCG) were significantly associated with the risk of conversion. Only 6.3% of patients with a β-hCG level <10,000 IU at presentation were converted from medical to surgical management. There was no significant association between fetal cardiac activity and conversion from medical to surgical management.

CONCLUSIONS

CSP has emerged as an important phenomenon in modern obstetrics and gynecology, and its frequency appears to be on the rise. The preferred method of treatment remains unclear; however, it is possible that a large MSD and trophoblastic mass at presentation should prompt surgical treatment.