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Journal of Perinatal Medicine

Official Journal of the World Association of Perinatal Medicine

Editor-in-Chief: Dudenhausen, Joachim W.

Editorial Board Member: / Bancalari, Eduardo / Milner, Anne / Genc, Mehmet R. / Chervenak, Frank A. / Chappelle, Joseph / Bergmann, Renate L. / Bernardes, J.F. / Bevilacqua, G. / Blickstein, Isaac / Cabero Roura, Luis / Carbonell-Estrany, Xavier / Carrera, Jose M. / D`Addario, Vincenzo / D'Alton, MD, Mary E. / Dimitrou, G. / Grunebaum, Amos / Hentschel, Roland / Köpcke, W. / Kawabata, Ichiro / Keirse, Marc J.N.C. / Kurjak M.D., Asim / Lee, Ben H. / Levene, Malcolm / Lockwood, Charles J. / Marsal, Karel / Makatsariya, Alexander / Nishida, Hiroshi / Ogata, Edward / Papp, Zoltán / Pejaver, Ranjan Kumar / Pooh, Ritsuko K. / Romero, Roberto / Saugstad, Ola D. / Schenker, Joseph G. / Sen, Cihat / Seri, Istvan / Vetter, Klaus / Winn, Hung N. / Young, Bruce K. / Zimmermann, Roland

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Online
ISSN
1619-3997
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Volume 34, Issue 2 (Apr 2006)

Issues

The Northwestern twin chorionicity study: testing the ‘placental crowding’ hypothesis

Isaac Blickstein
  • Kaplan Medical Center, Rehovot, Israel
/ Saar Mincha
  • Department of Obstetrics and Gynecology, Kaplan Medical Center, Rehovot and The Hadassah-Hebrew University School of Medicine, Jerusalem, Israel
/ Ran D. Goldman
  • Division of Emergency Services, Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
/ Geoffry A. Machin
  • Cherrilee Crescent, Victoria, British Columbia, Canada
/ Louis G. Keith
  • Department of Obstetrics and Gynecology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
Published Online: 2006-03-07 | DOI: https://doi.org/10.1515/JPM.2006.028

Abstract

Objective: To evaluate the relation between placental proximity and frequency of birth weight discordance and small-for-gestational age (SGA) infants.

Study design: Retrospective three-tier chorionicity analysis of 1155 twin placentas comparing birth weight characteristics of the twins in different placental types.

Results: Dichorionic-separate, but not dichorionic-fused twins, are heavier than monochorionic-diamniotic and monoamniotic twins (2376±721 vs. 2274±770, P<0.006, and 2376±721 vs. 2166±782, P<0.04). SGA twins are less frequent among dichorionic twins (OR 0.4; 95% CI 0.3, 0.6). Fewer sets with two SGA infants are present among dichorionic-separate compared to monochorionic-diamniotic pairs (OR 0.3; 95% CI 0.1, 0.8). The same trends are found when comparing all dichorionic to all monochorionic twins. Twins of all placental types have similar gestational ages and discordance values.

Conclusions: Dichorionic-separate placentas are least likely to experience ‘placental crowding’ and thus are associated with heavier twins and fewer sets with one or two SGA infants.

Keywords: Birth weight; chorionicity; discordance; placenta; twins

References

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About the article

Corresponding author: Dr. Isaac Blickstein Kaplan Medical Center Department of Obstetrics and Gynecology 76100 Rehovot/Israel Tel.: +972-8-944 1930 Fax: +972-8-941 1944


Received: August 9, 2005

Revised: November 6, 2005

Accepted: November 24, 2005

Published Online: 2006-03-07

Published in Print: 2006-04-01


Citation Information: Journal of Perinatal Medicine, ISSN (Online) 1619-3997, ISSN (Print) 0300-5577, DOI: https://doi.org/10.1515/JPM.2006.028. Export Citation

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