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A Study of Twin Placentation in Tokyo

Published online by Cambridge University Press:  01 August 2014

K. Yoshida  and
H. Soma
K. Yoshida*
Affiliation:
Department of Obstetrics and Gynecology, Tokyo Medical College
H. Soma
Affiliation:
Department of Obstetrics and Gynecology, Tokyo Medical College
*
Department of Obstetrics and Gynecology, Tokyo Medical College, 6-7-1 Nishi-shinjuku, Shinjuku-ku, Tokyo 160, Japan

Abstract

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A total of 178 placentas of twins born in Tokyo in 1961-1982 were examined. Only just over one third were dichorionic, 110 being monochorionic and DZ twins were estimated to account for 24.7% of the pairs. The lower frequency of DZ twinning in Japan is attributed to lower gonadotropin values in Japanese women as compared to European, American, or African women. High fetal morbidity was found in monochorionic twins and this is attributed to a frequent occurrence of vascular anastomoses.

Keywords

Twin placentationTwinning ratesGonadotropinsVascular anastomosesTwin transfusion syndromeAcardiusFetus papyraceus
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 33 , Issue 1 , January 1984 , pp. 115 - 120
Copyright
Copyright © The International Society for Twin Studies 1984

References

REFERENCES

1.Akamatsu, H, Shimano, S (1981): Management of abnormal pregnancy. Fetal outcome in multiple pregnancy. Obstet Gynecol Pract 30:33–44.Google Scholar
2.Benirschke, K (1961): Accurate recording of twin placentation. A plea to the obstetrician. Obstet Gynecol 18:334–347.Google Scholar
3.Cameron, AH (1968): The Birmingham twin survey. Proc Roy Soc Med 61:229–234.Google Scholar
4.Milham, S Jr (1964): Pituitary gonadotropin and dizygotic twinning. Lancet 2:556.Google ScholarPubMed
5.Nylander, PPS (1970): Placental forms and zygosity determination of twins in Ibadan, West Nigeria. Acta Genet Med Gemellol 19:49–54.CrossRefGoogle Scholar
6.Nylander, PPS (1973): Serum levels of gonadotropins in relation to multiple pregnancy in Nigeria. J Obstet Gynaecol Br Commonw 80:651–653.CrossRefGoogle ScholarPubMed
7.Nylander, PPS (1978): Causes of high twinning frequencies in Nigeria. In Nance, WE, Allen, G, Parisi, P (eds): “Twin Research: Part B, Biology and Epidemiology”. New York: Alan R Liss, p. 35–43.Google Scholar
8.Potter, EL (1963): Twin zygosity and placental form in relation to outcome of pregnancy. Am J Obstet Gynecol 87:566–577.Google Scholar
9.Soma, H, Takayama, M, Kiyokawa, T (1975): Serum gonadotropin levels in Japanese women. Obstet Gynecol 46:311–312.Google ScholarPubMed
10.Strong, SJ, Corney, G (1967): The frequency of twinning and zygosity. In: The Placenta in Twin Pregnancy. Oxford: Pergamon Press, p 26–32.Google Scholar
11.Yen, SSC, Vela, P, Rankin, J.Littell, AS (1970): Hormonal relationship during the menstrual cycle. J Am Med Assoc 211:1513–1517.Google Scholar