An emergency (rescue) cervical cerclage can be offered to pregnant women presenting with dilatation and prolapsed membranes in the second trimester of pregnancy because of cervical insufficiency. This study aimed to investigate the effectiveness of an emergency cerclage in both singleton and twin pregnancies in the prevention of extreme premature birth.
We performed a systematic literature search in PubMed and Embase from inception to June 2022 for transvaginal cervical emergency cerclages.
All studies on transvaginal cervical emergency cerclages with at least 5 patients and reporting survival were included.
Included studies were assessed for quality and risk of bias with an adjusted Quality In Prognosis Studies tool. Random-effects meta-analyses and meta-regressions were performed for the primary outcome: survival.
Our search yielded 96 studies, incorporating 3239 women, including 14 studies with an expectant management control group, incorporating 746 women. Overall survival after cervical emergency cerclage was 74%, with a fetal survival of 88% and neonatal survival of 90%. Singleton and twin pregnancies showed similar survival, with a pregnancy prolongation of 52 and 37 days and a gestational age at delivery of 30 and 28 weeks, respectively. Meta-regression analyses indicated a significant inverse association between mean gestational age at diagnosis and pregnancy prolongation and no association between dilatation or gestational age at diagnosis and gestational age at delivery. Compared with expectant management, emergency cerclage significantly increased overall survival by 43%, fetal survival by 17% and neonatal survival by 22%, along with a significant pregnancy prolongation of 37 days and reduction in delivery at <28 weeks of gestation of 55%. These effects were more profound in singleton pregnancies than in twin pregnancies.
This systematic review indicates that, in pregnancies threatened by extreme premature birth because of cervical insufficiency, emergency cerclage leads to significantly higher survival, accompanied by significant pregnancy prolongation and reduction in delivery at <28 weeks of gestation, compared with expectant management. The mean gestational age at delivery was 30 weeks, independent of dilatation or gestational age at diagnosis. Survival was similar for singleton and twin pregnancies, implying that emergency cerclage should be considered in both.

A history of abortion is associated with cervical dysfunction during pregnancy, but there remains uncertainty about whether risk can be stratified by the abortion type, the abortion procedure, or number of previous abortions. The objective of this study was to verify the relationship between cervical dysfunction measures in pregnancies with and without a history of termination. Embase and Medline databases were searched from 01 January 1960 to 01 March 2022 resulting in a full-text review of 28 studies. The Newcastle-Ottawa Scale (NOS) was used to assess the quality and risk of bias for non-randomized studies. The meta-analysis consisted of 6 studies that met all inclusion and exclusion criteria and included a combined total of 2,513,044 pregnancies. Cervical dysfunction was defined as either cervical insufficiency/incompetence in 4 of the studies and as short cervix in the others. Results from a random-effects model using reported adjusted odds ratios (aOR) estimated an increase in the odds of 2.71 (95% CI 1.76, 4.16) for cervical dysfunction in the current pregnancy related to a history of induced or spontaneous abortion. Subgroup analyses with only induced abortions (surgical/medical) estimated an aOR of 2.54 (95% CI 1.41, 4.57), while studies limited to surgical abortions had an aOR of 4.08 (95% CI 2.84, 5.86). The risk of cervical dysfunction in the current pregnancy was also found to be dependent on the number of previous abortions. In this meta-analysis, a prior history of abortion, and specifically induced abortions, was associated with cervical dysfunction. The protocol was registered in PROSPERO (CRD42020209723).

Failure or technical impossibility to place a prophylactic transvaginal cerclage in women with cervical insufficiency justifies the need for an abdominal cerclage. In this systematic review and meta-analysis, we studied the obstetrical and surgical outcomes of laparoscopic and open laparotomy abdominal cerclage approaches performed before (interval) or during pregnancy.
We performed a systematic literature search in PubMed, Embase, and the Cochrane Library for studies on laparoscopic and open laparotomy abdominal cerclage placement in February 2022.
All studies on laparoscopic or open laparotomy placement of an abdominal cerclage with at least 2 patients that reported on our primary outcomes were included.
All included studies were assessed for quality and risk of bias with an adjusted Quality in Prognosis Study tool. Random effects meta-analyses were performed for the primary outcomes, namely fetal survival and gestational age at delivery.
Our search yielded 83 studies with a total of 3398 patients; 1869 of those underwent laparoscopic cerclage placement and 1529 underwent open laparotomy placements. No studies directly compared the 2 cerclage approaches. The survival (overall, 91.2%) and gestational age at delivery (overall, 36.6 weeks) were not statistically different between the approaches. For the procedure during pregnancy, the laparoscopic group showed significantly less blood loss >400 mL (0% vs 3%), a slightly lower procedure-related fetal loss (0% vs 1%), a shorter hospital stay but a longer operation duration than the open laparotomy group. For the interval cerclages, the laparoscopic group showed significantly fewer wound infections (0% vs 3%) and a shorter hospital stay than the open laparotomy group, but showed comparable offspring preterm birth and survival rates.
Based on indirect comparisons, the laparoscopic and open laparotomy abdominal cerclage placements at interval or during pregnancy produced similar outcomes in terms of survival and gestational age at delivery. There are some small differences in perioperative care, surgical complications, interventions, and complications during pregnancy. This implies that both methods of abdominal cerclage placement have high success rates and thus we cannot conclude that one of the methods is superior for the placement of an abdominal cerclage.

BACKGROUND: Cervical insufficiency (CI) may result in preterm delivery. We sought out to perform this review and analysis to compare the efficacy of laparoscopic and open transabdominal cerclage (TAC) in patients suffering with CI.
METHODS: Our search included PubMed, Scopus, MEDLINE, ClinicalTrials.Gov, Cochrane and Web of Science. We analyzed the data with Open Meta-Analyst Software as well as Review Manager Software. We included observational and randomized controlled trials that included patients with CI that underwent laparoscopic cerclage or TAC.
RESULTS: We included a total of 43 studies. Laparoscopic and TAC had a positive effect by increasing gestational age (GA); for the laparoscopic group (mean deviation (MD)) = 14.86 weeks (W), 95% CI [10.67, 19.05], P < 0.001) and TAC (MD = 12.79 W, 95% CI [10.97, 14.61], P < 0.001). Furthermore, improvements in all outcomes assessed (total fetal survival rate, neonatal weight, and prevention of delivery at a gestational age of<24 weeks) were all significant with the exception of the prevention of all preterm deliveries<37 weeks; for both laparoscopic at (RR = 0.116, 95% CI [-0.006, 0.238], P = 0.063) and TAC at (MD = 1, 95% CI [0.45, 2.24], P = 1), and for prevention of deliveries<34 weeks for the laparoscopic group (RR = 0.446, 95% CI [-0.323, 1.215], P = 0.256) only.
CONCLUSIONS: Although limited data prevented pregnancy and prepregnancy subgroups as well as a head-to-head comparison, we still found that in patients suffering from CI, both TAC and laparoscopic approaches to cerclage revealed a positive effect in preserving the pregnancy.

Cervical insufficiency is a recognised cause of third trimester miscarriage and spontaneous preterm births. It is one of the leading causes of neonatal morbidity and mortality. Miscarriage and preterm deliveries due to cervical insufficiency can be prevented by cervical cerclage insertion. The study aimed to determine the time interval between elective cervical cerclage removal at term and spontaneous onset of labour in Enugu, south-east Nigeria. A ten year retrospective review of all women who had cervical cerclage inserted for suspected cervical insufficiency at the two tertiary health institutions in Enugu state was done. Their case files were retrieved and relevant data extracted. The mean time interval from cerclage removal at term to spontaneous onset of labour was 12 days. The majority of patients (45.6%) had spontaneous onset of labour at the 2nd week of cerclage removal. There was no significant difference in the mean time interval from cerclage removal to spontaneous onset of labour between ultrasound indicated group and history indicated group. These findings hopefully may assist in proper counselling and management of women who had cervical cerclage removed at term.Impact StatementWhat is already known on this subject? Cervical insufficiency is a known cause of mid trimester pregnancy loss and preterm delivery. Preterm babies are at risk of several complications, with high neonatal morbidity and mortality especially in developing world. Cervical cerclage insertion is a recognised surgical treatment for cervical incompetence aimed at preventing preterm births.What do the results of this study add? The study shows that removal of cervical cerclage at term does not result in immediate onset of spontaneous labour in women diagnosed to have cervical insufficiency. Notably, a majority of the women had spontaneous onset of labour at the 2nd weeks of cerclage removal. Only 5.3% of them had spontaneous onset of labour within 48 hours of cerclage removal. This is contrary to the general belief in the region that once cervical cerclage is removed, spontaneous onset of labour results.What are the implications of these findings for clinical practice and/or further research? This finding suggests that there is no compelling need for admission into hospital after removal of cerclage as very few of them will have spontaneous onset of labour within 48 hours of cervical cerclage removal.

Several studies acknowledge that the presence of amniotic fluid sludge (AFS) is an independent predictive factor for preterm birth. In the present systematic review, we summarize research that focuses on the comparison of pregnancy outcomes among women with and without AFS.
Medline, Scopus, Clinicaltrials.gov, EMBASE, Cochrane Central Register of Controlled Trials (CENTRAL), and Google Scholar databases were systematically searched from inception. Both observational and randomized controlled studies were considered eligible provided that they reported data on pregnancy outcomes among women with and without AFS. Outcomes were not meta-analyzed because of the high heterogeneity in terms of selected population and outcome reporting.
Seventeen studies of 2432 women were included in this review. Six studies evaluated women at high risk for preterm birth. Pregnancies complicated by AFS had a lower gestational age at delivery and increased incidence of preterm delivery at <37 weeks. Neonatal death rates and admission to the Neonatal Intensive Care Unit were also increased. Evidence in low-risk women, those with signs of preterm labor, in those carrying twins, and in women with cervical cerclage or Arabin pessary was extremely limited.
Women with AFS seem to deliver at an earlier gestational age, and preterm birth rates are also increased. Limited data seem to point to neonatal morbidity and mortality being increased. However, the presence of a direct association should not be assumed because the evidence is not adjusted for the presence of confounders.

BACKGROUND: The gold standard in the management of cervical incompetence is cerclage via vaginal approach. Minimally invasive techniques, such as robotic, have been also described.
METHODS: A systematic search was performed in PubMed and Scopus, searching evidence on robotic assisted laparoscopic cerclage in both pregnant and non pregnant women.
RESULTS: Sixty-four patients were included in this study. Cervical insufficiency, failure of transvaginal cerclage, and short cervix were the most frequent indications for robotic assisted cerclage. Mean operative time was 107.3 minutes. Mean estimated blood loss was 62.8 mL. Four patients converted to laparotomy. No postoperative complications were reported. Pregnancy after robotic cerclage was reported in 59 patients with mean gestational age at delivery of 36.4 weeks. The majority of pregnant women who underwent robotic assisted cerclage gave birth to live neonates.
CONCLUSIONS: Till now, evidence does not show a clear advantage of robotic over laparoscopic approach, under the evaluation of the current literature. However, further comparative studies might be essential to clarify the possible role of da Vinci robot in this field; this might be quite difficult even in the near future based on the fact that only five cases per year are described in the current literature.

We report a robotic-assisted, ultrasound-guided abdominal cerclage placement during pregnancy that resulted in term delivery, and review the current literature with respect to the efficacy of robotic-assisted transabdominal cerclage (RoboTAC) placement. The patient was a 25-year-old gravida 5 para 0-0-4-0 with cervical insufficiency who failed McDonald cerclage placement in two prior pregnancies, and presented at 13 weeks with a shortened (1.66 cm) cervical length. Placement of abdominal cerclage with robotic assistance under ultrasound guidance was performed at a teaching hospital. The main outcome measure was feasibility of RoboTAC placement in a gravid uterus under ultrasound guidance, and delivery of an infant ≥34 weeks of gestation with neonatal survival. Abdominal cerclage was safely and successfully placed at 13 weeks with robotic assistance. The patient had an otherwise uncomplicated antenatal course and was delivered via primary cesarean section at 38 weeks. Robotic-assisted abdominal cerclage can be considered for patients who require abdominal cerclage placement by skilled robotic surgeons.

Amniotic fluid sludge (AFS) is defined as the presence of particulate matter in the amniotic fluid in close proximity to the cervix. Although its prevalence is known to correlate with the risk of preterm delivery, initial reports describe a strong association between AFS and microbial invasion of the amniotic cavity (MIAC) and histological chorioamnionitis. However, AFS is also present in uncomplicated pregnancies, and its prevalence appears to increase with gestational age. Recent evidence debates the usefulness of AFS as a marker of early preterm delivery risk. We present four cases with AFS diagnosed by transvaginal ultrasound at admission for cervical insufficiency between 20 and 24 weeks of gestation, with confirmed lower genital tract and intra-amniotic infections by amniocentesis and histological chorioamnionitis and funisitis. Our findings reinforce the presence of AFS as a useful marker of MIAC, chorioamnionitis and funisitis that increase the likelihood of preterm delivery at an extreme gestational age.