Umbilical cord coiling index for the prediction of adverse pregnancy outcomes: a meta-analysis and sequential analysis

References

• Ma’ayeh M, McClennen E, Chamchad D, et al. Hypercoiling of the umbilical cord in uncomplicated singleton pregnancies. J Perinat Med. 2017;46:593–598.
   Web of Science ®Google Scholar
• Strong TH, Jr., Jarles DL, Vega JS, et al. The umbilical coiling index. Am J Obstet Gynecol. 1994;170:29–32.
   PubMed Web of Science ®Google Scholar
• Steinl GK, Gandelman JS, Katzman PJ, et al. Umbilical cord coiling in high-risk pregnancies: associations with determinants of adverse birth outcomes and iron status. Pediatr Dev Pathol. 2018;21:537–547.
   PubMed Web of Science ®Google Scholar
• Jessop FA, Lees CC, Pathak S, et al. Umbilical cord coiling: clinical outcomes in an unselected population and systematic review. Virchows Arch. 2014;464:105–112.
   PubMed Web of Science ®Google Scholar
• Liberati A, Altman DG, Tetzlaff J, et al. The PRISMA statement for reporting systematic reviews and meta-analyses of studies that evaluate health care interventions: explanation and elaboration. J Clin Epidemiol. 2009;62:e1–e34.
   PubMed Web of Science ®Google Scholar
• Wells GA, Shea B, O’Connel D, et al. The Newcastle-Ottawa Scale (NOS) for assessing the quality of nonrandomized studies in meta-analysis. 2011; Available from: www.ohri.ca/programs/clinical_epidemiology/oxford.asp.
   Google Scholar
• Wallace BC, Dahabreh IJ, Trikalinos TA, et al. Closing the gap between methodologists and end-users: R as a computational back-end. J Stat Soft. 2012;49:5.
   Web of Science ®Google Scholar
• Rana J, Ebert GA, Kappy KA. Adverse perinatal outcome in patients with an abnormal umbilical coiling index. Obstet Gynecol. 1995;85:573–577.
   PubMed Web of Science ®Google Scholar
• Ezimokhai M, Rizk DE, Thomas L. Maternal risk factors for abnormal vascular coiling of the umbilical cord. Am J Perinatol. 2000;17:441–445.
   PubMed Web of Science ®Google Scholar
• Machin GA, Ackerman J, Gilbert-Barness E. Abnormal umbilical cord coiling is associated with adverse perinatal outcomes. Pediatr Dev Pathol. 2000;3:462–471.
   PubMed Web of Science ®Google Scholar
• Predanic M, Perni SC, Chervenak FA. Antenatal umbilical coiling index and Doppler flow characteristics. Ultrasound Obstet Gynecol. 2006;28:699–703.
   PubMed Web of Science ®Google Scholar
• de Laat MW, Franx A, Bots ML, et al. Umbilical coiling index in normal and complicated pregnancies. Obstet Gynecol. 2006;107:1049–1055.
   PubMed Web of Science ®Google Scholar
• Kashanian M, Akbarian A, Kouhpayehzadeh J. The umbilical coiling index and adverse perinatal outcome. Int J Gynecol Obstet. 2006;95:8–13.
   PubMed Web of Science ®Google Scholar
• Gupta S, Faridi MMA, Krishnan J. Umbilical coiling index. J Obstet Gynecol India. 2006;45:315–319.
   Google Scholar
• de Laat MW, van Alderen ED, Franx A, et al. The umbilical coiling index in complicated pregnancy. Eur J Obstet Gynecol Reprod Biol. 2007;130:66–72.
   PubMed Web of Science ®Google Scholar
• El Behery MM, Nouh AA, Alanwar AM, et al. Effect of umbilical vein blood flow on perinatal outcome of fetuses with lean and/or hypo-coiled umbilical cord. Arch Gynecol Obstet. 2011;283:53–58.
   PubMed Web of Science ®Google Scholar
• Jo YS, Jang DK, Lee G. The sonographic umbilical cord coiling in late second trimester of gestation and perinatal outcomes. Int J Med Sci. 2011;8:594–598.
   PubMed Web of Science ®Google Scholar
• Chitra T, Sushanth YS, Raghavan S. Umbilical coiling index as a marker of perinatal outcome: an analytical study. Obstet Gynecol Int. 2012;2012:1.
   Google Scholar
• Devaru D, Thusoo M. Umbilical coiling index & the perinatal outcome. J Obstet Gynecol India. 2012;62:43–46.
   PubMedGoogle Scholar
• Patil NS, Kulkarni SR, Lohitashwa R. Umbilical cord coiling index and perinatal outcome. J Clin Diagn Res. 2013;7:1675–1677.
   PubMedGoogle Scholar
• Abdulrasul E. Umbilical coiling index as a predictor of adverse perinatal outcome. Int J Adv Res. 2014;2:101–107.
   Google Scholar
• Mittal A, Nanda S, Sen J. Antenatal umbilical coiling index as a predictor of perinatal outcome. Arch Gynecol Obstet. 2015;291:763–768.
   PubMed Web of Science ®Google Scholar
• Tripathy S. Umbilical coiling index and its relationship with perinatal outcomes. Indian J Neonat Med Res. 2014;2:1–4.
   Google Scholar
• Sahoo K, Mahajan A, Shana P, et al. Evaluation of umbilical coiling index as a predictor of pregnancy outcome. Int J Health Sci Res. 2015;5:92–100.
   Google Scholar
• Gaikwad P, Patole K. Umbilical coiling index and perinatal outcome. Mvpjms. 2016;3:118–121.
   Google Scholar
• Ohno Y, Terauchi M, Tamakoshi K. Perinatal outcomes of abnormal umbilical coiling according to a modified umbilical coiling index. J Obstet Gynaecol Res. 2016;42:1457–1463.
   PubMed Web of Science ®Google Scholar
• Adesina KT, Ogunlaja OA, Olarinoye AO, et al. An observation of umbilical coiling index in a low risk population in Nigeria. J Perinat Med. 2018;46:341–345.
   Web of Science ®Google Scholar
• Chholak D, Gupta P, Khajotia S. Study to evaluate association of umbilical coiling index and perinatal outcome. Int J Reprod Contracept Obstet Gynecol. 2017;6:408–412.
   Google Scholar
• Peres LC, Taylor D. Overestimation of umbilical cord coiling index with segmental versus total length assessment. Pediatr Dev Pathol. 2012;15:303–305.
   PubMed Web of Science ®Google Scholar
• Blickstein I, Varon Y, Varon E. Implications of differences in coiling indices at different segments of the umbilical cord. Gynecol Obstet Invest. 2001;52:203–206.
   PubMed Web of Science ®Google Scholar
• Cromi A, Raio L, Ghezzi F, et al. P261: sonographic assessment of the umbilical cord coiling index during the entire gestation. Ultrasound Obstet Gynecol. 2003;22:140.
   Google Scholar
• de Laat MW, van der Meij JJ, Visser GH, et al. Hypercoiling of the umbilical cord and placental maturation defect: associated pathology? Pediatr Dev Pathol. 2007;10:293–299.
   PubMed Web of Science ®Google Scholar
• Ernst LM, Minturn L, Huang MH, et al. Gross patterns of umbilical cord coiling: correlations with placental histology and stillbirth. Placenta 2013;34:583–588.
   PubMed Web of Science ®Google Scholar