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Seasonality in Early Loss of One Fetus Among Twin Pregnancies

Published online by Cambridge University Press:  01 August 2014

I. Nakamura ,
M. Uno ,
Y. Io ,
I. Ikeshita ,
K. Nonaka  and
T. Miura
I. Nakamura*
Affiliation:
Department of Hygiene, Teikyo University School of Medicine, Tokyo, Japan
M. Uno
Affiliation:
Department of Hygiene, Teikyo University School of Medicine, Tokyo, Japan
Y. Io
Affiliation:
Department of Hygiene, Teikyo University School of Medicine, Tokyo, Japan
I. Ikeshita
Affiliation:
Obstetrics and Gynecology, Metropolitan Tsukiji Maternity Hospital, Tokyo, Japan
K. Nonaka
Affiliation:
Department of Hygiene, Teikyo University School of Medicine, Tokyo, Japan
T. Miura
Affiliation:
Department of Hygiene, Teikyo University School of Medicine, Tokyo, Japan
*
Department of Hygiene, Teikyo University School of Medicine, Kaga, Itabashi-ku, Tokyo 173, Japan

Abstract

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Ultrasonographic examinations were performed on 519 pregnant women in the first trimester at three hospitals in Tokyo from August 1985 to March 1987. Among 519 women, two fetal heart movements (FHMs) were comfirmed in six cases. In two of these six cases, one of two FHMs disappeared two weeks later, and these were considered the “vanishing twin”. In eight cases among those with ultrasonographic image of echo-free-space (EFS) in the uterus, the observed EFS was considered to be a probable empty gestational sac (GS-like-EFS-image). Seven of eight GS-like-EFS-images were observed in October-December (p < 0.01) and two “vanishing twin” cases were also observed in the same season. Spontaneous abortion occurred in 11 cases and these were also more frequently observed in October-November (p < 0.05). Some abortive factor is supposed to have prevailed in October-December. All six women having twin fetuses (including the “vanishing twin” cases) were born in January-May (p < 0.05) and those having GS-like-EFS-images or terminating their pregnancy in spontaneous abortion were also born more frequently in the same season. Twin-prone and abortion-prone characteristics of the women born in this season are considered.

Keywords

Vanishing twinSeasonality
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 39 , Issue 3 , July 1990 , pp. 339 - 344
Copyright
Copyright © The International Society for Twin Studies 1990

References

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