To study the relationship between suboptimal maternal thyroid function during gestation and breech presentation at term.
Design
Prospective follow-up study during three trimesters of gestation.
Patients
A total of 1058 Dutch Caucasian healthy pregnant women were prospectively followed from 12 weeks gestation until term (>or=37 weeks) delivery.
MEASUREMENTS: Maternal thyroid parameters [TSH, free T4 (FT4) and auto-antibodies to thyroid peroxidase] were assessed at 12, 24 and 36 weeks gestation as well as foetal presentation at term.
Results
At term, 58 women (5.5%) presented in breech. Compared with women with foetuses in the cephalic position, those women who presented in breech at term had significantly higher TSH concentrations, but only at 36 weeks gestation (P = 0.007). No between group differences were obtained for FT4 level at any assessment. The prevalence of breech presentation in the subgroup of women with TSH >or= 2.5 mIU/l (90th percentile) at 36 weeks gestation was 11%, compared with 4.8% in the women with TSH < 2.50 mIU/l (P = 0.006). Women with TSH below the 5th percentile had no breech presentations. Breech position was significantly and independently related to high maternal TSH concentration (>or=2.5 mIU/l) at 36 weeks gestation (O.R.: 2.23, 95% CI: 1.14-4.39), but not at 12 and 24 weeks gestation.
Conclusions
Women with TSH levels above 2.5 mIU/l during end gestation are at risk for breech presentation, and as such for obstetric complications.
PMID 19832853 19832853 DOI 10.1111/j.1365-2265.2009.03729.x 10.1111/j.1365-2265.2009.03729.x Kuppens et al. 2009, Kuppens 2009
Cite this article
Kuppens, S. M. I., Kooistra, L., Wijnen, H. A., Crawford, S., Vader, H. L., Hasaart, T. H., Oei, S. G., & Pop, V. J. (2010). Maternal thyroid function during gestation is related to breech presentation at term. Clinical endocrinology, 72(6), 820-824. https://doi.org/10.1111/j.1365-2265.2009.03729.x
Kuppens SMI, Kooistra L, Wijnen HA, Crawford S, Vader HL, Hasaart TH, et al. Maternal thyroid function during gestation is related to breech presentation at term. Clin Endocrinol (Oxf). 2010;72(6):820-824. doi:10.1111/j.1365-2265.2009.03729.x
Kuppens, Simone M. I., et al. "Maternal thyroid function during gestation is related to breech presentation at term." Clinical endocrinology, vol. 72, no. 6, 2010, pp. 820-824.
Keywords
Adult, Breech Presentation/epidemiology/etiology, Female, Humans, Longitudinal Studies, Mothers, Pregnancy/physiology, Pregnancy Complications/blood/epidemiology, Term Birth/physiology, Thyroid Diseases/blood/complications/epidemiology, Thyroid Function Tests, Thyroid Gland/physiology, Thyroid Hormones/blood, Thyrotropin/blood, Young Adult, Thyroid Hormones, Thyrotropin
This population-based cohort study examined preconception TSH levels and their association with pregnancy outcomes in 184,611 Chinese women planning to conceive. Women were classified into reference (0.48-2.49 mIU/L), upper limit (2.5-4.28 mIU/L), and high TSH (4.29-10 mIU/L) groups. The high normal TSH group showed higher rates of spontaneous abortion, preterm birth, and operative vaginal delivery compared to reference. The high TSH group had higher rates of spontaneous abortion, stillbirth, and preterm births.
Pregnancy Complications · Premature Rupture of Membranes
Hsu JZ et al., 2025·Eur J Obstet Gynecol Reprod Biol·
Endometriosis is a chronic gynaecological condition affecting reproductive-aged women. It has been associated with infertility and potential risks for adverse pregnancy outcomes, although population-level evidence remains limited. This retrospective cohort study, including 147,950 pregnant women aged 20-45 years, used nationwide population-based data to compare the outcomes between women with (n = 11,400) and without (n = 136,550) endometriosis between 2000 and 2021. Baseline characteristics, comorbidities and pregnancy outcomes were compared between the groups. Multivariable regression analyses were performed to calculate adjusted relative risks (aRR) and 95 % confidence intervals (CI) for various pregnancy outcomes, and subgroup analyses were conducted by maternal age and infertility status. Among 147,950 pregnancies, women with endometriosis [mean ± standard deviation (SD) age 32.38 ± 4.51 years] had higher socio-economic status, more comorbidities, and more surgical history compared with women without endometriosis (mean ± SD age 30.06 ± 4.96 years). Women with endometriosis had increased risk of miscarriage (aRR 1.13, 95 % CI 1.03-1.24), preterm birth (aRR 1.31, 95 % CI 1.26-1.37), premature rupture of membranes (aRR 1.11, 95 % CI 1.06-1.16), placenta previa (aRR 1.63, 95 % CI 1.45-1.84), urinary tract infection (aRR 1.44, 95 % CI 1.31-1.59), and caesarean section (aRR 1.13, 95 % CI 1.11-1.16). Subgroup analysis revealed that risk of miscarriage was only higher in women aged 35-45 years and women without infertility. Risks of preterm birth, placenta previa and caesarean section were elevated across all subgroups, suggesting that endometriosis contributes independently to adverse pregnancy outcomes. Endometriosis is an independent risk factor for several pregnancy complications, supporting the need for tailored prenatal care and closer monitoring of affected women to improve maternal outcomes.
Solmonovich R et al., 2025·Fertility and sterility
To determine whether an association exists between in vitro fertilization (IVF) and severe maternal morbidity among low-risk pregnant patients. Retrospective cohort study. Low-risk pregnant patients who delivered between January 2019 and December 2022. Low-risk was defined as having an obstetric comorbidity index score of 0. In vitro fertilization. MAIN OUTCOME MEASURE(S): The primary outcome (dependent variable) was any severe maternal morbidity. The secondary outcome was the need for a cesarean delivery. A modified Poisson regression with robust error variance was used to model the probability of severe maternal morbidity as a function of IVF. Risk ratios and their associated 95% confidence intervals (CIs) were computed. An α value of 0.05 was considered statistically significant. RESULT(S): A total of 39,668 pregnancies were included for analysis, and 454 (1.1%) were conceived by IVF. The overall severe maternal morbidity rate was 2.4% (n = 949), with the most common indicator being blood transfusion. The overall cesarean delivery rate was 18.8% (n = 7,459). On modified Poisson regression, IVF-conceived pregnancies were associated with 2.56 times the risk of severe maternal morbidity (95% CI, 1.73-3.79) and 1.54 times the risk of having a cesarean delivery (95% CI, 1.37-1.74) compared with non-IVF pregnancies. CONCLUSION(S): In vitro fertilization is associated with higher rates of severe maternal morbidity, primarily the need for a blood transfusion, and cesarean delivery in low-risk pregnancies without major comorbidities. Recognizing this association allows healthcare providers to implement proactive measures for better monitoring and tailored postpartum care.
Young-Wolff KC et al., 2024·JAMA internal medicine
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