McGill Reproductive Center, Royal Victoria Hospital, Department of Obstetrics and Gynecology, McGill University, 687 Pine Avenue West, Montreal, Quebec H3A 1A1, Canada
1 To whom correspondence should be addressed at: Oxford Fertility Unit, Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Womens Centre, Level 4, John Radcliffe Hospital, Oxford OX3 9DU, UK. e-mail: timothychild{at}yahoo.com
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Abstract |
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Key words: assisted reproductive treatment/complications/counselling/infertility/multiple pregnancy
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Introduction |
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Contrary to prevailing medical opinion, many infertility patients appear to consider multiple pregnancy an ideal treatment outcome. Assisted reproductive treatment may be expensive, invasive and stressful, and with per cycle pregnancy rates generally well below 50%, most couples require more than one treatment cycle to achieve success. A desire for an instant family would not therefore be surprising. We performed a prospective study to quantify fertility patients desire for multiple birth and the extent to which demographic variables such as sex, age, duration of infertility, previous children, history of assisted reproductive treatment, and recognition of the increased risks of multiple pregnancy affect this desire.
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Materials and methods |
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We asked whether patients considered that babies of a multiple pregnancy are at increased risk compared with singletons. For the outcome variable, patients were asked to state the desired number of babies with their next fertility treatment. A 1 after twins, triplets or quadruplets was considered a positive response. Using multiple logistic regression analysis (SPSS release 9.0) we identified independent variables significantly associated with a positive response (i.e. stated desire for multiple pregnancy). A second logistic regression analysis was performed with recognition of the increased fetal risks in multiple pregnancy as the dependent variable.
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Results |
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Discussion |
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Patients recognizing the increased fetal risks of multiple pregnancy were significantly less likely to want this outcome [odds ratio (OR) 0.30, 95% confidence interval (CI) 0.200.46] (Table II ). We did not investigate the means through which knowledge of the increased risks was acquired. However, the sole significant variable associated with recognition of the increased fetal risks was previous assisted reproductive treatment (OR 1.70, 95% CI 1.112.60) (Table III). Patients in our centre are informed of the increased risks of multiple pregnancy during clinic appointments and counselling sessions at each stage of treatment. These findings suggest that patient education may play an important role in reducing desire for multiple birth.
Reduced patient desire for multiple birth may assist physicians in minimizing the chance of a multiple gestation following treatment. Patients may conceivably be more willing to have fewer embryos transferred to the uterus in IVF treatment or a lower threshold for cycle cancellation following excessive follicular development during ovulation induction and timed intercourse/insemination therapy. Some groups are advocating single embryo transfer in good prognosis patients to reduce the risk of multiple pregnancy (Martikainen et al., 2001). Our data suggest that 41% of patients would actually prefer multiple embryo transfer in order to achieve multiple pregnancy. It is notable that history of assisted reproductive treatment was associated with heightened awareness of the increased risks but also increased desire for multiple birth. This could imply that whilst risk awareness increased following assisted reproductive treatment, treatment failure resulted in increasing desperation for a complete family. This suggests that counselling on multiple pregnancy risks is continued throughout a couples course of assisted reproductive treatment, and that the increasing desire or desperation for multiple birth after previous failure is considered when making treatment decisions.
Previous studies have examined infertility patients attitudes to multiple birth (Leiblum et al., 1990; Gleicher et al., 1995
; Goldfarb et al., 1996
; Murdoch, 1997
; Pinborg et al., 2003
). One study included 77 couples (Goldfarb et al., 1996
) and another 154 couples undergoing infertility treatment (plus a control group of 72 female students of unproven fertility) (Leiblum et al., 1990
). Gleicher et al. (1995
) reported a much larger survey of 582 couples, though the responses of men and women were not considered separately. They mailed a questionnaire to 3800 unselected couples with infertility problems achieving a 15% response rate. In a postal survey of an undisclosed number of UK patients, Murdoch (1997
) received 150 replies to a question asking the ideal outcome of IVF treatment; one, two or three babies?. Forty-five per cent of respondents considered multiple pregnancy an ideal outcome, whilst 31% desired a single child and 24% either one or two babies. A Danish postal survey of the mothers of all 34 year old twins (whether from IVF or spontaneous conceptions) and IVF singletons born during 1997 (n = 1769) showed a high desirability for multiple birth (Pinborg et al., 2003
). More IVF twin mothers (85%) preferred twins as their first child compared with IVF singleton mothers (62%) or non-IVF twin mothers (60%). These studies generally show a positive attitude towards multiple pregnancy by infertile patients.
The findings of the current study of 801 patients support and extend these observations. In particular we invited the opinions of male partners and utilized logistic regression analysis to control for confounding variables. Our response rate of 50%, though significantly higher than the 15% of Gleicher et al. (1995
), was not as high as desired. We did not ask non-responders why they did not answer. The response rate may have been higher if patients had been interviewed in person, though this technique would have reduced the sample size significantly due to time limitations. However, the number of responses, 801, is greater than reported in previous similar studies.
We chose to ask the opinions of male partners since they are also part of the assisted reproductive treatment cycle, and would be expected to have some input into the decision on numbers of embryos to transfer during IVF. If we had found that men had a lower level of recognition of the increased risks of multiple birth and were significantly more likely to desire this outcome, then close examination of the pretreatment counselling offered would be required. As it was, we did not find a significant difference in responses between men and women. This probably indicates that the counselling imparted to patients before and during treatment is getting through to both partners. We did not analyse responses within and between couples. It may have been that the partners in a couple tended to answer similarly. This would not be surprising since they would tend to have similar demographics and to have undergone treatment and counselling together. Overall, however, the desire for multiple birth or the recognition of the increased risks does not differ between the sexes.
The aim of assisted reproductive treatment should be the birth of a healthy child. A singleton conception is most consistent with this outcome. The desire for multiple birth expressed by 41% of our Canadian patients is not consistent with prevailing medical opinion regarding the risks of multiple pregnancy. Recognition of the increased fetal risks of multiple gestation markedly reduces this desire. Patient education may play an important role in assisting physicians in the quest to reduce the contribution of assisted reproductive treatment to multiple births and their attending complications.
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Appendix |
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MALE
How old are you? ____ years old
For how long have you and your partner been having unprotected intercourse? ____ years and ____ months
How many children have you had (including with previous partners)? No. of children ____
Which of the following fertility treatments have you had? (circle all relevant answers).
Yes/No IVF (in-vitro/test-tube baby treatment)
Yes/No IUI (drug stimulation of ovaries and insemination of sperm into the uterus)
Yes/No Surgery to open blocked tubes
Yes/No Other______________________
Put into order what you would consider to be the ideal number of babies to have in one pregnancy with your next fertility treatment, e.g. if you think the ideal outcome is quadruplets, and the second best outcome triplets, then put a 1 by quads, a 2 by triplets and so on until all 4 lines are filled.
___ Single baby (1 baby)
___ Twins (2 babies)
___ Triplets (3 babies)
___ Quadruplets (4 babies)
Do you think there are more dangers for the babies in a multiple pregnancy compared to a singleton pregnancy? YES NO
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References |
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Collins JA (2000) Too much of a good thing. J Soc Obstet Gynecol Can 23,177180.
Gleicher N, Campbell DP, Chan CL, Karande V, Rao R, Balin M and Pratt D (1995) The desire for multiple births in couples with infertility problems contradicts present practice patterns. Hum Reprod 10,10791084.[Abstract]
Goldfarb J, Kinzer DJ, Boyle M and Kurit D (1996) Attitudes of in vitro fertilization and intrauterine insemination couples toward multiple gestation pregnancy and multifetal pregnancy reduction. Fertil Steril 65,815820.[ISI][Medline]
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Leiblum SR, Kemmann E and Taska L (1990) Attitudes toward multiple births and pregnancy concerns in infertile and non-infertile women. J Psychosom Obstet Gynecol 11,197210.[ISI]
Martikainen H, Tiitinen A, Tomas C, Tapanainen J, Orava M, Tuomivaara L, Vilska S, Hyden-Granskog C and Hovatta O (2001) One versus two embryo transfer after IVF and ICSI: a randomized study. Hum Reprod 16,19001903.
Murdoch A (1997) Triplets and embryo transfer policy. Hum Reprod 12,8892.[Abstract]
Pinborg A, Loft A, Schmidt L and Andersen AN (2003) Attitudes of IVF/ICSI-twin mothers towards twins and single embryo transfer. Hum Reprod 18,621627.
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Submitted on March 25, 2003; resubmitted on September 24, 2003; accepted on October 28, 2003.