BACKGROUND: Little is known about the influence of high exposure to bisphenol A on recurrent miscarriage and immunoendocrine abnormalities. METHODS: Serum bisphenol A, antiphospholipid antibodies (aPLs), antinuclear antibodies (ANAs), natural killer cell (NK) activity, prolactin, progesterone, thyroid-stimulating hormone (TSH) and free T4 were examined in 45 patients with a history of three or more (3–11) consecutive first-trimester miscarriages and 32 healthy women with no history of live birth and infertility. Subsequent pregnancy outcome and embryonic karyotype of abortuses were examined prospectively. RESULTS: The mean±SD values for bisphenol A in patients were 2.59±5.23ng/ml, significantly higher than the 0.77±0.38ng/ml found for control women (P=0.024). High exposure to bisphenol A was associated with the presence of ANAs but not hypothyroidism, hyperprolactinaemia, luteal phase defects, NK cell activity or aPLs. A high level of bisphenol A in itself did not predict subsequent miscarriage. CONCLUSION: Exposure to bisphenol A is associated with recurrent miscarriage.

We previously found that a normal karyotype in a previous miscarriage is a predictor of subsequent miscarriage. However, the prevalence of recurrent miscarriage caused by an abnormal embryonic karyotype has not yet been reported, since embryonic karyotype is not typically analyzed during conventional examinations. A total of 482 patients who underwent both embryonic karyotype determination and conventional examinations for recurrent miscarriage were enrolled in this study. The distribution of the causes and the live birth rate for each cause were examined. The total percentage of subjects in whom conventional causes of recurrent miscarriage could be detected was 29.5%. The prevalence of the abnormal embryonic karyotype was 41.1% in the subjects in whom no conventional causes of miscarriage could be identified. The prevalence of recurrent miscarriage of truly unexplained cause, that is, of subjects without conventional causes in whom the embryonic karyotype was ascertained to be normal, was 24.5%. Among the patients in whom the first determination revealed an abnormal embryonic karyotype, 76.2% (32/42) showed an abnormal embryonic karyotype in the repeat determination as well. The cumulative live birth rate (71.9%) in women with recurrent miscarriages caused by the abnormal embryonic karyotype was significantly higher than that (44.7%) in women with recurrent miscarriages associated with the embryonal euploidy. An abnormal embryonic karyotype was found to represent the commonest cause of recurrent miscarriage, and the percentage of cases with recurrent miscarriage of truly unexplained cause was limited to 24.5%.The two groups should be distinguished for both clinical and research purposes.

BACKGROUND: Unexplained miscarriage is speculated to be due to a Th1/Th2 cytokine imbalance at the feto–maternal interface and immunological functions are known to be under the influence of various psychological factors. Indeed, the psycho–neuro–immuno–endocrine network has been proposed to contribute to miscarriage. To assess whether psychological disorders might induce spontaneous abortion we carried out a prospective study to determine if any psychological parameter influenced risk in those patients with a history of recurrent miscarriages. METHODS: A prospective study was carried out on 61 patients with a history of two consecutive first-trimester miscarriages. A battery of self-report questionnaires including Symptom Checklist-90 Revised and the NEO Five Factor Index and semi-structured interviews were conducted before a subsequent pregnancy. We investigated whether or not these parameters predicted subsequent miscarriages. RESULTS: Ten (22.2%) of the 45 patients who conceived miscarried again. Baseline depressive symptoms influenced subsequent miscarriage (P = 0.004). This statistically significant effect remained when we corrected with Bonfferoni adjustment (P = 0.036). CONCLUSIONS: A high depression scale is associated with a high miscarriage rate in those patients suffering recurrent miscarriage.

Background: The work patterns of pregnant women may be related to adverse obstetric and perinatal outcomes. This study aimed to clarify the effects of weekly working time according to frequencies of night shifts during pregnancy on adverse outcomes in Japan.Methods: The Japan Environment and Children's Study, a prospective cohort study, was conducted in 15 regions nationwide in Japan. The study population included pregnant women with singleton pregnancies (n = 99 744). The mothers’ working hours and frequencies of night shifts during the first and the second/third trimesters were assessed using a self‐administered questionnaire. Outcome data were collected from medical transcripts.Results: Compared with nonworking women, women who worked during pregnancy had significantly increased adjusted odds ratios (aORs) of threatened miscarriage (maximum aOR: 1.47, 95% confidence interval [95% CI]: 1.26‐1.73) and of threatened preterm labor (maximum aOR: 1.63, 95% CI: 1.41‐1.87). Increased aORs were observed for hypertensive disorders of pregnancy (maximum aOR: 2.02, 95% CI: 1.39‐2.93) in women working ≥36 hours per week with night shifts, for vacuum/forceps delivery (maximum aOR: 1.34, 95% CI: 1.22‐1.48) at ≥36 hours with or without night shifts, and for small‐for‐gestational‐age babies (aOR: 1.32, 95% CI: 1.10‐1.59) at ≥46 hours with night shifts. In contrast, lower aORs were observed for gestational diabetes and meconium‐stained amniotic fluid in women working without night shifts.Conclusions: Work during pregnancy slightly increased the risks of threatened miscarriage and threatened preterm labor. Long working hours increased the risks of hypertensive disorders of pregnancy, vacuum/forceps delivery, and small‐for‐gestational‐age babies.