1. Role of velamentous cord insertion in monochorionic twin pregnancies: a PRISMA-compliant systematic review and meta-analysis of observational studies.
- Author
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Lin, Dongxin, Fan, Dazhi, Wu, Shuzhen, Rao, Jiaming, Zhang, Huishan, Chen, Ting, Liu, Juan, Ye, Shaoxin, Zeng, Meng, Liu, Yan, Guo, Xiaoling, and Liu, Zhengping
- Subjects
RESEARCH ,META-analysis ,RESEARCH methodology ,SYSTEMATIC reviews ,UMBILICAL cord ,FETAL growth retardation ,FETOFETAL transfusion ,TWINS ,MEDICAL cooperation ,EVALUATION research ,COMPARATIVE studies ,BIRTH weight ,MULTIPLE pregnancy - Abstract
Background: Velamentous cord insertion (VCI) has been proposed to be associated with some specific complications among monochorionic (MC) twin pregnancies. This meta-analysis and systematic review aims to determine the role of VCI in MC twin pregnancies.Methods: The PubMed, Embase and Web of Science databases and reference lists were searched for relevant studies. Outcomes of interest included twin-to-twin transfusion syndrome (TTTS), birthweight discordance (BWD) and selective intrauterine growth restriction (sIUGR). The methodological quality of the included studies was assessed by using the Newcastle-Ottawa Scale. The pooled results were calculated by means of a random or fixed effect model to obtain odds ratio with 95% confidential interval (CI). Subgroup analyses were utilized to detect the sources of heterogeneity.Results: Twenty studies were eligible for inclusion. The pooled result suggested a significant association between VCI and TTTS (OR, 1.542; 95% CI, 1.116-2.129) with a moderate level of heterogeneity (Q test: p = .024; I2 = 50.2%). Subgroup analysis reported single-center study, methodological quality and exclusion of laser-coagulated TTTS as the sources of heterogeneity. Another analysis revealed an increased risk of BWD among twin pregnancies with VCI (OR, 2.945; 95% CI, 2.176-3.984) with a low heterogeneity (Q test: p = .347; I2 = 10.5%). None of study level characteristics was found to be an influencing factor. Three studies reporting on sIUGR suggested a significant association between VCI and sIUGR.Conclusions: The meta-analysis and systematic review suggests an association between VCI and BWD and sIUGR. However, the association between VCI and TTTS may be overestimated and high-quality studies with a representative sample are needed in further research. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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