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The paradox of declining fertility but increasing twinning rates with advancing maternal age

  1. S.N. Beemsterboer,
  2. R. Homburg 1 ,
  3. N.A. Gorter,
  4. R. Schats,
  5. P.G.A. Hompes and
  6. C.B. Lambalk
  1. Division of Reproductive Medicine, Department of Obstetrics & Gynaecology, Vrije University Medical Centre, Amsterdam, The Netherlands
  1. 1To whom correspondence should be addressed at: Division of Reproductive Medicine, Department of Obstetrics & Gynaecology, Vrije University Medical Centre, PO Box 7057, 1007 MB Amsterdam, The Netherlands. E-mail: r.homburg{at}vumc.nl
  • Received June 1, 2005.
  • Revision received January 1, 2006.
  • Accepted January 9, 2006.

Abstract

BACKGROUND: Advancing female age is associated with declining fertility potential due to decreasing numbers and quality of oocytes but also with a distinct increase in dizygotic twinning rates, a phenomenon that has never been explained. METHOD: An analysis of follicle development was made in 959 spontaneous ovulatory cycles of 507 women. RESULTS: Multiple ovarian follicular development (>1 follicle >14 mm) and, by implication, multiple rather than single ovulations occurred in 105 women whose mean age (36.1 versus 34.6 years) and mean basal FSH concentrations (10.3 versus 7.7 IU/l) were significantly greater than those with monofollicular development (P < 0.01). The prevalence of multifollicular development increased with age. CONCLUSIONS: Dizygotic twinning must be associated with the development of >1 large follicle, which we found to be a significantly more frequent occurrence in older women. It is hypothesized that the response of pituitary release of FSH to the decreased negative feedback induced by impending ovarian failure often ‘overshoots’, causing multiple follicular development. In the presence of two good-quality oocytes, a twin pregnancy may result.

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    1. Hum. Reprod. (June 2006) 21 (6): 1531-1532. doi: 10.1093/humrep/del009 First published online: February 23, 2006
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