1 The Bridge Centre, 1 St Thomas Street, London, SE1 9RY and 2 Department of Obstetrics and Gynaecology, St Bartholomew's and The Royal London School of Medicine and Dentistry, St Bartholomew's Hospital, West Smithfield, London EC1A 7BE, UK
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Abstract |
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Key words: age/donor sperm/IUI/ovulation induction
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Introduction |
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The need to prevent transmission of sexually transmitted diseases has led to the mandatory quarantine of donor semen prior to use and, unfortunately, post-thaw sperm survival, motility and pregnancy rates are affected adversely by both the cryopreservation technique and cryoprotective medium used, with fecundability rates falling from 18.9% to as low as 5% with fresh and frozenthawed sperm respectively (Ritcher et al., 1984).
Assuming that the women requiring DI are fertile, the success of IUIDI may be influenced by many variables, such as timing of insemination (Awonuga and Govindbhai, 1999), frequency of insemination, (Khalifa et al., 1995
) number of treatment cycles and use of ovarian stimulation (OS) with clomiphene citrate (CC) or gonadotrophins (hMG) (Brzechffa et al., 1998
). Although these and other variables have been extensively investigated, there are still limited and controversial data on the effect of women's age and OS.
Since we considered that the choice of fertility treatment would be related to the age of the woman, we retrospectively reviewed 1056 cycles of IUIDI in 261 women in order to determine the influence of patient's age, therapeutic regime and number of treatment cycles on the cycle fecundity of women undergoing IUIDI treatment with respect to the cumulative pregnancy rate.
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Materials and methods |
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Patients (n = 10) with ovulatory dysfunction were treated with CC (daily for 5 days, 50100 mg) or hMG (typically 75150 units on alternate days). OS was used (n = 106) empirically to increase the number of oocytes available, with both CC or hMG until 23 follicles, diameter 1620 mm, were seen. The use of OS in the first eight cycles compared with spontaneous ovulation is shown in Table I. In women undergoing OS, transvaginal ultrasonography and serum estradiol (E2) measurements were performed to assess follicular development and reduce the risk of ovarian hyperstimulation syndrome and the insemination was withheld if four or more follicles of 1620 mm were seen, to reduce the risk of multiple pregnancy.
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Frozen donor sperm samples were thawed, centrifuged and prepared using discontinuous Percoll gradients (Pharmacia AB, Uppsala, Sweden) until January 1996, after which the samples were prepared with IxaPrep (Medicut-Lerso Parkalle 4Z, DK-2100, Copenhagen, Denmark). Clinical pregnancy was defined as the presence of an embryonic or fetal heart ultrasonically at 68 weeks gestation or the identification of trophoblastic tissue histologically as in the case of ectopic pregnancy. Selective fetal reduction was not performed in any patients in this study.
Statistical analysis
Comparison between variables was performed by the 2-test. The mean values among groups were compared using a standard analysis of variance, P < 0.05 being considered statistically significant. The Bonferroni correction for multiple comparisons was used to adjust the
level for statistical significance (Abt, 1981
). Data for life table analysis were performed by previously described methods (Cramer et al., 1979
). Log rank test was used to show differences between the curves (Glanz, 1981
).
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Results |
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The average cycle fecundity for all attempts was 10.6%. Of the 112 pregnancies (107 singleton, five twins), 78 (70%) led to a delivery, 34 (30%) resulted in miscarriage and two (1.9%) were ectopic pregnancies.
Single versus lesbian women
These data include 212 single women and 49 lesbians with a mean age 41.0 ± 4.0 and 35.0 ± 5.1 years respectively, who underwent 864 and 192 cycles of IUIDI respectively with pregnancy rates of 9.6 and 13.5% per cycle and 39 and 53% per patient treated. These differences were not statistically significant when corrected for age and due to the smaller number of lesbian women included in the study. Consequently, the results of both groups were pooled for the analysis which follows.
Pregnancy rate in relation to age
The overall pregnancy rate per cycle was 18.5% for women <35 years of age, 11.9% if 3540 years of age, and 5.4% if >40 years old (P < 0.05; Table II). There was a statistically significant difference (P = 0.0002) between the mean age of the patients who became pregnant (35.6 ± 4.5 years) and those who did not (37.8 ± 4.4 years). The cumulative pregnancy rate (CPR) after eight cycles for women
34 years was 86%, compared with 51 and 32% in women 3540 and >40 years old respectively (Figure 1
).
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The pregnancy rate in relation to the number of mature follicles was 9.3, 11.2 and 11.5% respectively when one, two or three mature follicles were seen (not significant).
Characteristics of the semen analysis and number of follicles prior to insemination
There was no correlation seen between the number of follicles prior to IUIDI (1.6 ± 0.8 in the pregnant patients and 1.5 ± 0.8 in non-pregnant women) and the pregnancy rate.
The association between conception and sperm characteristics was examined. The mean number (±SD) of motile sperm inseminated in conception cycles (10.9 ± 7.1x106) was not different from the number inseminated for non-conception cycles (11.5 ± 10.2x106).
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Discussion |
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Recently, the treatment of older single women (heterosexuals or lesbians) with DI has became a major challenge due to an increase in delayed childbearing (Cook and Golombok, 1995; Ferrara et al., 2000
).
The effect of fertility treatments in the general population may be better understood from studying single women undergoing DI. Since these women are typically fertile, we are more likely to avoid confounding variables such as the aetiology of infertility. Though pelvic pathology has been reported in the literature ranging from 2 to 72% of women who failed to conceive during DI (Aiman, 1982), we have assumed that women requesting DI do not have the same risk features as a woman who may also have an oligospermic partner (Emperaire et al., 1980
).
The results of this large retrospective study demonstrate a decline in both pregnancy rate and CPR with increasing patient age, the vast majority of pregnancies occurring in the first five treatment cycles.
The lowest rates of pregnancy per cycle were seen among the patients >35 (11.9%) and 40 years old (4.5%; P < 0.016; Table II), which is in accord with other reports (respectively 12.4 and 5.6%) (Kang and Wu, 1996
). A likely explanation is that both oocyte quality and uterine receptivity decline with age (Meldrum, 1993
).
In our study, the CPR analysed according to age after eight cycles was 0.86 in women <35 and 0.51 in women 3540 years. In older patients, a plateau was evident after six cycles, when the CPR was only 0.32. The younger patients (<35 years old) had a significantly better result than older patients (P < 0.05). Analysis of the CPR in relation to the patient's stimulation regime did not reveal a statistically significant difference (Figure 2).
The use of OS either with CC or hMG failed to show any statistically significant improvement on fecundity in comparison with spontaneously ovulating women. The use of CC was associated with the lowest fecundity rate when considering age (Table III; Figure 2
), these differences not being statistically significant.
The use of CC has not been found to enhance the success rate of IUIDI (Depypere et al., 1994) and IUI with partner sperm (Huges, 1997
), but, in contrast with our results, the use of hMG has been reported to have a favourable effect (Guzick et al., 1999
; Lashen et al., 1999
). However, only the pregnancy rate per patient was statistically significantly different and not the pregnancy rate per cycle [5 and 18% in natural cycles and 9 and 33% with superovulation in one study (Guzick et al., 1999
), and 13 and 32% in natural cycles, 21 and 53% with superovulation in the other (Lashen et al., 1999
)]. The pregnancy rate per cycle and the CPR are better measures than the pregnancy rate per patient to determine the likelihood of a patient achieving pregnancy. When counselling a patient who is nearly or >40 years old, it is important to explain the low possibility of pregnancy, as well as the time and the number of treatment cycles needed. A patient aged 3540 years has a 57% chance of pregnancy, but only after nearly 1 year (Table II
).
The fact that different therapeutic regimens failed to effect the pregnancy rate in an IUIDI programme makes this therapeutic approach for such patients questionable and possibly not beneficial.
Multiple pregnancy is an important aspect of OS that needs to be taken into account, an incidence of 6.525% being reported (Chaffkin et al., 1991; Nulsen et al., 1993
; Nuojua-Huttunen et al., 1999
). In this study, the multiple pregnancy rate was only 4.5% in total (3.6% in spontaneous ovulatory cycles; 3.4 and 7.4% respectively in CC and gonadotrophin cycles; not significant), and 42% of treatment cycles followed spontaneous ovulation. We also did not inseminate patients who produced more than four mature follicles (
14 mm diameter, 19.5% of the cancelled cycles).
Our results show that there is a very low live birth rate (3%) per cycle in women >40 years of age; however, it is higher than the 1.4% reported in infertile couples of the same age from other centres (Frederick et al., 1994).
In contrast to Kang and Wu who described a slight though statistically significant higher pregnancy rate in relation to the number of motile sperm inseminated (Kang and Wu, 1996), in our study there was no evidence of a significant correlation between number of sperm or number of follicles and pregnancy rate. Others have also failed to find differences (Nuojua-Huttunen et al., 1999
).
Our results indicate that IUIDI is a poor treatment option for women >40 years of age and confirm that the woman's age is a major determinant of the success of any fertility therapy. The success rates of IVF have also been reported to decrease with advancing female age (Hull et al., 1996), indicating that the negative impact of age can only be partly overcome by assisted reproductive technology. Despite this, the cumulative pregnancy rate after three cycles of IVF in women >40 years is 57.8% (Engmann et al., 1999
), which makes it reasonable to limit the number of IUIDI treatment cycles performed in older patients and advise them to consider a more aggressive treatment.
Our data suggest that if pregnancy has not occurred following spontaneous ovulation, the resort to OS either with CC or hMG in women with no proof of ovulation dysfunction does not seems to improve the pregnancy rate in IUIDI and that the only factor limiting the success of the treatment is age.
Our findings may be biased as this is a retrospective study. Nevertheless, the results are interesting in that they highlight the limitations of OS in improving the effectiveness of IUIDI. A further prospective randomized study comparing the performance of hMG on IUI versus no treatment showing the results as a life table analysis, may verify or refute our results.
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Acknowledgements |
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Notes |
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References |
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Submitted on December 15, 2001; accepted on May 3, 2002.