Consequences of smoking and caffeine consumption during pregnancy in women with type 1 diabetes.

OBJECTIVE: To test the hypothesis that, in women with type 1 diabetes, prenatal smoking and caffeine consumption during pregnancy are associated with an increased risk of adverse maternal and perinatal outcomes. METHODS: A secondary analysis of data on pregnant women with type 1 diabetes from an interdisciplinary program of Diabetes in Pregnancy. Women were interviewed monthly, by a trained non-medical member of the research team, using a standardized questionnaire, to ascertain daily smoking habits and caffeine consumption. RESULTS: Smoking and caffeine information were available on 191 pregnancies, 168 progressing beyond 20 weeks of gestation. Early pregnancy smoking (OR 3.3, 95% CI 1.2, 8.7) and caffeine consumption (OR 4.5, 95% CI 1.2, 16.8) were associated with increased risk of spontaneous abortion when controlling for age, years since diagnosis of diabetes, previous spontaneous abortion, nephropathy and retinopathy. Smoking throughout pregnancy was significantly associated with decreased birth weight and prolonged neonatal hospital stay. Smoking throughout pregnancy (OR 0.2, 95% 0.1, 1.0) and caffeine consumption after 20 weeks (OR 0.3, 95% CI 0.1, 1.0) were associated with reduced risk of pre-eclampsia. CONCLUSIONS: Caffeine consumption during early pregnancy, regardless of glycemic control, increases the risk of spontaneous abortion. Smoking throughout pregnancy and caffeine consumption are associated with reduced risk of pre-eclampsia.     

Menstrual and reproductive factors and risk of non-fatal acute myocardial infarction in Italy

OBJECTIVE: We analyzed the relation between factors related to endogenous female hormones and the risk of acute myocardial infarction (AMI). STUDY DESIGN: We used a combined dataset from three Italian case-control studies, including 609 women with non-fatal AMI and 1106 controls hospitalized for acute conditions. RESULTS: The odds ratios (OR) of AMI were 1.36 (95% confidence intervals, CI 0.95-1.96) in women with an irregular menstrual pattern compared to a regular one, and 1.45 (95% CI 1.07-1.97) in parae compared to nulliparae, without linear trend in risk with number of children. No relation was found with menopausal status, age at menarche and menopause, abortion, and age at first and last birth. Compared to women without abortions the OR was 0.84 (95% CI 0.60-1.18) for >1 abortion; compared to women without spontaneous or induced abortion, the ORs were 0.92 (95% CI 0.62-1.38) for >1 spontaneous and 0.63 (95% CI 0.36-1.08) for >1 induced abortion. The association of parity and irregular menstrual cycles was stronger in pre-/peri-menopausal women and in current smokers. Compared to nonsmokers with regular menstrual cycle, the OR was 5.98 (95% CI 3.38-10.56) for smokers with irregular one, and compared to nonsmokers nulliparae the OR for smokers parae was 4.77 (95% CI 3.12-7.29). CONCLUSIONS: Irregular menstrual cycles and parity were related to increased AMI risk, mainly among pre-/peri-menopausal women and among smokers.     

孕期咖啡因摄入与流产相关性分析性研究系统综述

目的 探讨孕期咖啡因摄入与流产之间的关系。方法 基于2014年1月对5个数据库的检索结果,研究纳入观察孕妇在妊娠期间咖啡因摄入与否与流产之间关系的分析性研究。两名研究者独立进行文献筛选、资料提取及严格评价的过程。对于纳入研究的方法学质量评价采用纽卡斯尔-渥太华量表（NOS量表）。数据分析运用Revman5.2软件,二分类变量的效应值用比值比（OR）及其95%CI（CI）表示,研究间的统计学异质性采用I2检验,对于异质性在容许范围内的研究进行Meta分析。结果 研究共纳入了7项病例对照研究和7项队列研究（合计149 474名孕期妇女）,纳入研究的NOS评分均为7~8分（满分9分）,显示方法学质量良好。单个研究的结果对于咖啡因摄入致孕妇流产的结论并不一致,而其中7项研究的Meta分析结果显示孕期咖啡因摄入可能会导致流产的危险,且危险程度随咖啡因摄入量增加（>300 mg/d）而加大（OR=1.35, 95%CI 1.27~1.44, P<0.00001）。结论 流行病学观察性研究的Meta分析及部分单个研究结果均提示孕妇每日饮用含咖啡因饮品,尤其是多>300 mg/d很可能会使流产率增加。故而,建议妊娠妇女在孕期最好减少或停止饮用咖啡或其他含咖啡因的饮品。     

Influence of hemostatic factors on spontaneous abortion.

To assess the relationship between hemostatic factors and spontaneous abortion, 134 pregnant women presenting to the emergency department were recruited and followed through 22 weeks' gestation. Cases were women experiencing a spontaneous abortion and controls were women who maintained their pregnancy. Fibrinogen, factor VII antigen, activated protein C-sensitivity ratio (APC-SR), protein S, and plasmin-antiplasmin (PAP) were measured. Cases had lower mean levels of fibrinogen and factor VII antigen compared with controls (3.1 g/L vs. 3.7 g/L and 89% of normal vs. 109% of normal, respectively). Regression analyses found that women with fibrinogen levels below 3.0 g/L had a five-fold increased risk of spontaneous abortion (OR = 5.1, 95% CI: 1.8-14.4) and women with factor VII antigen levels below 94% of normal had a threefold increased risk of spontaneous abortion normal (OR = 3.3, 95% CI: 1.2-8.5). Similar mean levels of APC-SR, protein S, and PAP were found in the two groups.     

Polymorphisms in the fibrinolytic pathway genes and the risk of recurrent spontaneous abortion

Impaired fibrinolytic activity is implicated in the pathogenesis of recurrent spontaneous abortion (RSA). This case-control study assessed the prevalence of polymorphisms in fibrinolytic system genes in RSA. Cases comprised 202 Sinhalese women who had experienced at least two first-trimester spontaneous abortions and had no living children; controls were 202 women with no history of spontaneous abortion and two or more living children. The groups were matched for age and ethnicity. DNA was genotyped using the Sequenom MassARRAY system. The PLAUR rs4251923 A (OR 95% CI 2.3 [1.3 to 4.0]), SERBP2 rs6098 A (OR 95% CI 1.4 [1.1 to 1.9]) and SERBP2 rs6103 C alleles (OR 95% CI 1.4 [1.1 to 1.9]) were increased in the RSA group compared with controls. The prevalence of PLAUR rs4251923/ SERBP2 rs6098/ SERBP2 rs6103 GG/AA/CC (OR 95% CI 2.4 [1.2 to 4.9], GA/GA/GC(OR 95% CI 3.9 [1.3 to 11.2]), GA/AA/CC (OR 95% CI 2.9 [1.0 to 8.6] and GA/GG/GG (OR 95% CI 21.3 [1.1 to 410.3]) genotypes were also increased in cases. Polymorphisms in the fibrinolytic system genes are associated with RSA in Sinhalese women. These likely impair implantation.     

Cigarette,alcohol, and caffeine consumption: risk factors for spontaneous abortion

OBJECTIVE: To study the association between cigarette, alcohol, and caffeine consumption and the occurrence of spontaneous abortion. METHODS: The study population consisted of 330 women with spontaneous abortion and 1168 pregnant women receiving antenatal care. A case-control design was utilized; cases were defined as women with a spontaneous abortion in gestational week 6-16 and controls as women with a live fetus in gestational week 6-16. The variables studied comprise age, parity, occupational situation, cigarette, alcohol, and caffeine consumption. The association between cigarette, alcohol, and caffeine consumption was studied using logistic regression analyzes while controlling for confounding variables. In addition stratified analyzes of the association between caffeine consumption and spontaneous abortion on the basis of cigarette and alcohol consumption were performed. RESULTS: Women who had given birth twice or more previously had increased odds ratio (OR), 1.78 (1.27-2.49), whereas women who were students had decreased OR, 0.55 (0.34-0.91) for having spontaneous abortions. Regarding lifestyle factors, the adjusted ORs among women who consumed 5 units or more alcohol per week or 375 mg or more caffeine per day were 4.84 (2.87-8.16) and 2.21 (1.53-3.18), respectively. Women who smoked 10-19 cigarettes and 20 or more cigarettes per day did not have significantly increased ORs for having spontaneous abortions, after adjusting for other risk factors. CONCLUSION: Consumption of 5 or more units alcohol per week and 375 mg or more caffeine per day during pregnancy may increase the risk of spontaneous abortion.     

History of miscarriage and increased incidence of fetal aneuploidy in subsequent pregnancy

OBJECTIVE: The purpose of this study was to examine the association between history of spontaneous abortion and aneuploidy in a subsequent pregnancy. METHODS: This was a retrospective cohort study of women who underwent fetal karyotype analysis with amniocentesis or chorionic villus sampling at a single prenatal diagnosis center. Information on spontaneous abortions, parity, maternal age, ethnicity, type of prenatal diagnosis, and karyotype was assessed. Univariable and multivariable analyses were conducted. RESULTS: A total of 46,939 women were included in our analysis. Women with no prior spontaneous abortions had a 1.39% risk for any aneuploidy. In women with one prior spontaneous abortion, this risk increased to 1.67%; for women with 2 previous spontaneous abortions, the risk increased to 1.84%; and for those women who had had 3 or more prior spontaneous abortions, the risk increased further to 2.18% (P < .007). When controlling for maternal age, parity, ethnicity, and mode of prenatal diagnosis and compared with women with no prior spontaneous abortions, women with one prior spontaneous abortion (adjusted odds ratio [AOR] 1.21, 95% confidence interval [CI] 1.01-1.47) or 3 or more prior spontaneous abortions (AOR 1.51, 95% CI 1.02-2.25) had a statistically significant increase in aneuploidy in a subsequent pregnancy. Women with 2 prior spontaneous abortions had an AOR of 1.26 for aneuploidy, but the 95% CI contained unity. CONCLUSION: An increased risk of karyotypic abnormality identified at the time of prenatal diagnosis is demonstrated in patients with an increasing number of spontaneous abortions. This study provides information regarding this risk among women presenting for prenatal diagnosis. According to our data, for a woman with an a priori risk of 1 in 300 for Down syndrome, 3 prior spontaneous abortions would increase that risk by 47% to 1 in 204. These results should be confirmed in low-risk populations.     

子痫前期高危因素的Logistic回归分析

目的:探讨影响子痫前期发病的主要高危因素及早期预测方法.方法:按照病例对照研究设计,对119例子痫前期病例和236例正常产妇对照组进行相关因素的回顾性调查,采用Logistic回归方法进行单因素和多因素分析,在此基础上建立子痫前期发病的预测模型,并对该模型进行初步评价.结果:孕前BMI≥24kg/m~2(OR=6.142,95%CI 3.361～11.225),高血压、糖尿病、肾炎疾病史(OR=14.092,95%CI 1.669～118.983),自然流产史(OR=3.008,95%CI1.160～7.801),高血压家族史(OR=3.050,95%CI 1.738～5.350)是子痫前期发病的主要危险因素.以Y=0.27作为判断界值,所建模型的后验灵敏度和特异度分别为68.1%和72.5%.结论:应加强对孕前BMI≥24 ks/m~2,有高血压、糖尿病、肾炎疾病史,有自然流产史及高血压家族史的妇女进行孕前及孕期保健,以预防及早期预测子痫前期的发生.     

History of induced abortion and the risk of tubal pathology

Tubal pathology is a common cause of subfertility. Identifying risk factors for tubal pathology in the medical history is important to distinguish between those couples who benefit from early tubal patency tests and those in whom presence of tubal pathology is less likely and delaying tubal tests is justified. This study evaluated whether a medical history of induced abortion is associated with an increased risk of tubal disease among subfertile couples. The reproductive history was determined for each couple. Tubal disease was diagnosed by hysterosalpingography and/or diagnostic laparoscopy. The association between reproductive history and the presence of tubal disease was assessed by calculating odds ratios (OR) and 95% confidence intervals (CI). Data from 6149 couples were available for analysis. The OR for tubal pathology after a previous induced abortion was 1.6 (95% CI 1.3 to 1.9), after a previous ectopic pregnancy, 8.4 (95% CI 6.3 to 12), after a previous spontaneous miscarriage, 1.1 (95% CI 0.87 to 1.3), and after a previous live birth, 1.0 (95% CI 0.88 to 1.2). A history of induced abortion is associated with an increased risk of tubal pathology in subfertile couples. As a consequence, in subfertile women with a history of induced abortion, tubal patency tests should be considered early in the diagnostic work-up.     

Dietary factors and risk of spontaneous abortion

OBJECTIVE: This study examines the association between dietary habits and risk of spontaneous abortion. DESIGN: Hospital-based case-control study. SETTING: Obstetric hospitals in Milan, Italy. SUBJECTS: Cases were: 912 women admitted for spontaneous abortion (within the 12th week of gestation). Controls were: women who gave birth at term to healthy infants on randomly selected days at the same hospitals where cases had been identified. RESULTS: The risk of spontaneous abortion was inversely and significantly related to green vegetables, fruit, milk, cheese, eggs and fish consumption. The multivariate odds ratios (OR), for highest versus lowest levels of intake, were 0.3 for fruit, 0.5 for cheese, 0.6 for green vegetables and milk and 0.7 for fish and eggs. The major type of seasoning fats have showed a direct association with risk of miscarriage. Comparing the highest with the lowest intake, the ORs were 2.0 (95% confidence interval, CI 1.1-3.6) and 1.6 (95% CI 1.1-2.3) for butter and oil, respectively. No consistent association emerged between meat, liver, ham and carrots intake and the risk of spontaneous abortion. CONCLUSIONS: This result suggests that a diet poor in several aspects, including vegetables and fruit, milk and dairy products, but rich in fats, may be a determinant or a correlate of increased risk of spontaneous abortion.     

Second-trimester maternal serum alpha-fetoprotein and risk of adverse pregnancy outcome(1)

OBJECTIVE: To determine the risk of adverse pregnancy outcome by maternal serum alpha-fetoprotein (MSAFP) level. METHODS: We followed 77,149 pregnant women and their infants from MSAFP screening in the 15th to 20th week of gestation until 1 year after birth. Information on pregnancy outcome was obtained from national registries. The relative risks (RRs) and 95% confidence intervals (CIs) for adverse pregnancy outcome were estimated according to the level of MSAFP, with adjustment for confounders. RESULTS: A total of 638 pregnancies resulted in spontaneous abortion, 289 in stillbirth, and 437 in infant death. Compared with women with MSAFP levels at 0.75-1.24 multiples of the median (MoM), those with MSAFP levels greater than or equal to 2.5 MoM had an increased risk of spontaneous abortion (RR 12.5; 95% CI 9.7, 16.1), preterm birth (RR 4.8; 95% CI 4.1, 5.5), small for gestational age (RR 2.8; 95% CI 2.4, 3.2), low birth weight (RR 5.8; 95% CI 5.0, 6.6), and infant death (RR 1.9; 95% CI 1.2, 2.8). Women with MSAFP levels below 0.25 MoM had an increased risk of spontaneous abortion (RR 15.1; 95% CI 9.3, 24.8), preterm birth (RR 2.2; 95% CI 1.3, 3.8), and stillbirth (RR 4.0; 95% CI 1.0, 16.0); those with levels less than 0.5 MoM had an increased risk of infant death (RR 1.9; 95% CI 1.2, 3.0). The increased risk of infant death remained after the subtraction of recognized conditions associated with extreme MSAFP values. CONCLUSION: Pregnant women with extreme MSAFP values in the second trimester have an increased risk of fetal and infant deaths. Obstet Gynecol 2001;97:277-82.     

Severe maternal morbidity and factors associated with the occurrence of abortion in Brazil

Objective

To evaluate the reported occurrence of spontaneous and induced abortion, and abortion-associated severe maternal morbidity in Brazil.

Methods

A secondary analysis of the 2006 Brazilian Demographic Health Survey was conducted. Interview data on women's experience of spontaneous/induced abortion and associated factors were analyzed overall and by geographic region. Multinomial logistic regression was performed to identify factors independently associated with abortion. The risk of associated severe maternal morbidity was estimated.

Results

The reported lifetime rates of spontaneous and induced abortion were 13.3% and 2.3%, respectively, and were highest in the north (4.3%) and northeast (3.5%). The rate of spontaneous abortion was higher among women aged 40-49 years (odds ratio [OR] 1.15; 95% confidence interval [CI], 1.03-1.30) and among those with 0 or 1 children or delivery (OR 1.97; 95% CI, 1.36-2.85 vs OR 1.98; 95% CI, 1.37-2.86). Induced abortion was not associated with sociodemographic factors. Abortion significantly increased the risk of complications (hemorrhage and infection).

Conclusion

Spontaneous abortion was significantly associated with parity and maternal age. Abortion in general carried a higher risk of severe maternal complications.     

History of abortion and subsequent risk of preeclampsia

OBJECTIVE: To examine the effect of abortion type, number and timing on risk of preeclampsia in subsequent pregnancies. STUDY DESIGN: We conducted a hospital-based, case-control study in Seattle and Tacoma, Washington, between 1998 and 2001. Preeclampsia cases (n = 199) and controls (n = 383) provided detailed information regarding their pregnancy histories and other covariates, such as prepregnancy weight and adult height. Odds ratios (ORs) and 95% confidence intervals (CIs) were estimated by logistic regression. RESULTS: Multiparous women, both with a history of abortion and without, experienced decreases of 60% (adjusted OR = 0.40, 95% CI .23-.71) and 71% (adjusted OR = .29, 95% CI .16-.53), respectively, in risk of preeclampsia when compared to nulliparous women with no history of abortion. Type (spontaneous and/or induced), number and timing of prior abortion did not appear to influence the risk of preeclampsia among nulliparous women. CONCLUSION: These results confirm the work of others that multiparous women, both with and without a history of abortion, have a reduced risk of preeclampsia. However, much work remains with respect to exploring mechanistic hypotheses offering biologic explanations and examining possible confounding factors of this association, such as change in paternity and interpregnancy interval.     

Risk of maternal postpartum readmission associated with mode of delivery

OBJECTIVE: To determine whether cesarean and operative vaginal deliveries are associated with an increased risk of maternal rehospitalization compared with spontaneous vaginal delivery. METHODS: A population-based cohort study was conducted by using the Canadian Institute for Health Information's Discharge Abstract Database between 1997/1998 and 2000/2001, which included 900,108 women aged 15-44 years with singleton live births (after excluding several selected obstetric conditions). RESULTS: A total of 16,404 women (1.8%) were rehospitalized within 60 days after initial discharge. Compared with spontaneous vaginal delivery (rate 1.5%), cesarean delivery was associated with a significantly increased risk of postpartum readmission (rate 2.7%, odds ratio [OR] 1.9, 95% confidence interval [CI] 1.8-1.9); ie, there was 1 excess postpartum readmission per 75 cesarean deliveries. Diagnoses associated with significantly increased risks of readmission after cesarean delivery (compared with spontaneous vaginal delivery) included pelvic injury/wounds (rate 0.86% versus 0.06%, OR 13.4, 95% CI 12.0-15.0), obstetric complications (rate 0.23% versus 0.08%, OR 3.0, 95% CI 2.6-3.5), venous disorders and thromboembolism (rate 0.07% versus 0.03%, OR 2.7, 95% CI 2.1-3.4), and major puerperal infection (rate 0.45% versus 0.27%, OR 1.8, 95% CI 1.6-1.9). Women delivered by forceps or vacuum were also at an increased risk of readmission (rates 2.2% and 1.8% versus 1.5%; OR forceps: 1.4, 95% CI 1.3-1.5; OR vacuum: 1.2, 95% CI 1.2-1.3, respectively). Higher readmission rates after operative vaginal delivery were due to pelvic injury/wounds, genitourinary conditions, obstetric complications, postpartum hemorrhage, and major puerperal infection. CONCLUSION: Compared with spontaneous vaginal delivery, cesarean delivery, and operative vaginal delivery increase the risk of maternal postpartum readmission. LEVEL OF EVIDENCE: II-2.     

Induced abortion in the first trimester of pregnancy and risk of miscarriage

Objective To analyse the relation between induced abortion and risk of subsequent miscarriage.
Design Case-control study conducted between February 1990 and May 1995.
Participants Case group included 782 women (median age 32 years, range 1446) admitted for spontaneous abortion (within the 12th week of gestation) to a network of obstetric departments in the greater Milan area. The control group was recruited among women who gave birth at term (> 37 weeks of gestation) to healthy infants on randomly selected days at the hospitals where cases had been identified. A total of 1543 controls (median age 30 years, range 14–45) were interviewed.
Results A total of 102 cases (13%) and 181 controls (12%) reported one or more induced abortions. No clear relation emerged between miscarriage and induced abortions. In comparison with women reporting no induced abortion the odds ratio (OR) for miscarriage were 1.1 (95% CI 0.8–1.4) in women reporting one induced abortion and 0.9 (95% CI 0.4–1.8) in women reporting two or more. Likewise, there was no association between time since last and age at first induced abortion and risk of miscarriage.
Conclusions This study did not find any strong association between induced and spontaneous abortion.     

Germline genetic polymorphisms of CYP1A1, GSTM1 and GSTT1 genes in Indian cervical cancer: associations with tumor progression, age and human papillomavirus infection

OBJECTIVES: Host genetic factors may play a role in human papillomavirus (HPV)-associated tumorigenesis, although the issue continues to be a focus of much debate. Biotransformation is critical in carcinogenic activity of numerous environmental carcinogens. It is therefore possible that polymorphisms of genes producing functional changes in xenobiotic metabolizing enzymes may be susceptible factors in cervical carcinogenesis. This study looked into possible relationships among these factors. METHODS: In this case-control study, we analyzed leukocyte DNA from a total of 312 subjects for germline polymorphisms of CYP1A1 (m1 and m2), GSTM1 and GSTT1 at various stages of the cervical tumor progression spectrum, using PCR and RFLP. RESULTS: Both m1 and m2 polymorphisms of the CYP1A1 gene were more frequent among cases (36.1% for m1 and 38.1% for m2) compared to control subjects (18.2% and 17.6% respectively). The odds ratio of a subject with homozygous CYP1A1 m1 and m2 variant being a case was highest (m1 OR = 4.77 [95% CI = 1.28-17.77]; P = 0.02 and m2 OR = 5.48 [95% CI = 1.49-20.19]; P = 0.011) respectively. The distribution of m1 and m2 CYP1A1 genotypes was also studied as a function of age and in relation to the presence of HPV 16 infection. The risk due to CYP1A1 m1 genotype, when adjusted for HPV status, showed a significantly increased risk (OR = 3.58, 95% CI = 1.88-6.81; P = 0.0001). Similar results were observed in the case of CYP1A1 m2 variant and HPV 16. There was a significant over-representation of both m1 (25.9% vs. 13.9%) and m2 (27.9% vs. 13.3%) polymorphisms in older women (46 years or more). GSTM1 and GSTT1 deletions were also prominent among cases (53.7% and 16.3% respectively) compared to controls (32.7% and 9.7% respectively). A higher proportion of both GSTT1 and GSTM1 deletions were also detected in HPV-16-positive subjects. CONCLUSIONS: These results suggest that polymorphisms in the CYP1A1, GSTM1 and GSTT1 genes may render women more susceptible to the development of cervical cancer. The association between this susceptibility and the presence of human papillomavirus infection further emphasizes the significance of the genetic polymorphisms.     

Risk of cesarean delivery with elective induction of labor at term in nulliparous women.

OBJECTIVE: To quantify the risk of cesarean delivery associated with elective induction of labor in nulliparous women at term. METHODS: We performed a cohort study on a major urban obstetric service that serves predominantly private obstetric practices. All term, nulliparous women with vertex, singleton gestations who labored during an 8-month period (n = 1561) were divided into three groups: spontaneous labor, elective induction, and medical induction. The risk of cesarean delivery in the induction groups was determined using stepwise logistic regression to control for potential confounding factors. RESULTS: Women experiencing spontaneous labor had a 7.8% cesarean delivery rate, whereas women undergoing elective labor induction had a 17.5% cesarean delivery rate (adjusted odds ratio [OR] 1.89; 95% confidence interval [CI] 1.12, 3.18) and women undergoing medically indicated labor induction had a 17.7% cesarean delivery rate (OR 1.69; 95% CI 1.13, 2.54). Other variables that remained significant risk factors for cesarean delivery in the model included: epidural placement at less than 4 cm dilatation (OR 4.66; 95% CI 2.25, 9.66), epidural placement after 4 cm dilatation (OR 2.18; 95% CI 1.06, 4.48), chorioamnionitis (OR 4.61; 95% CI 2.89, 7.35), birth weight greater than 4000 g (OR 2.59; 95% CI 1.69, 3.97), maternal body mass index greater than 26 kg/m2 (OR 2.36; 95% CI 1.61, 3.47), Asian race (OR 2.35; 95% CI 1.04, 5.34), and magnesium sulfate use (OR 2.18; 95% CI 1.04, 4.55). CONCLUSION: Elective induction of labor is associated with a significantly increased risk of cesarean delivery in nulliparous women. Avoiding labor induction in settings of unproved benefit may aid efforts to reduce the primary cesarean delivery rate.     

辅助生殖技术助孕后单胎妊娠早期流产的相关因素分析

目的 探讨辅助生殖技术(assisted reproductive technology,ART)助孕后单胎妊娠发生早期自然流产的相关因素.方法 对2003年1月1日至2008年8月31日在本院生殖中心行常规体外受精/卵母细胞浆内单精子注射的新鲜胚胎移植周期治疗后的1636例单胎妊娠病例进行分析,除外失访、子宫畸形、赠卵、晚期流产及资料不齐全者后,分为早期流产组(n=196)和活产分娩组 (n=1195),分析早期流产的相关因素.同时,比较新鲜胚胎移植周期和冷冻胚胎复苏移植周期(n=386)的流产率.结果 多因素Logistic回归分析早期自然流产的危险因素是孕妇年龄(OR=1.143,95%CI:1.096～1.196)、多囊卵巢综合征因素不孕(OR=4.309,95%CI:2.564～7.243),保护因素是移植胚胎的平均评分(OR=0.808,95%CI:0.717～0.912)、人绒毛膜促性腺激素(human chorionic gonadotropin,hCG)注射日子宫内膜三线型(OR=0.431,95%CI:0.243～0.764).早期流产组和活产分娩组孕妇的年龄[(32.22±4.10)岁和(30.28±3.66)岁]、不孕年限[(5.90±4.26)年和(5.20±3.32)年]、基础卵泡刺激素水平[(6.35±2.30)mIU/ml和(5.95±2.12)mIU/ml]、移植胚胎数[(2.31±0.51)个和(2.18±0.49)个]、hCG注射日雌二醇水平[(2467.1±1588.8)pg/ml和(2934.5±1785.2)pg/ml]、胚胎平均评分(7.03±1.35和7.74±1.25)比较,差异均有统计学意义(P＜0.05),冷冻胚胎复苏移植周期流产率高于新鲜周期[17.36%(67/386)和13.02%(213/1636),χ2=4.296,P=0.023].结论 年龄大、不孕年限长、基础卵泡刺激素高、多囊卵巢综合征因素不孕、移植胚胎的平均评分低、hCG注射日子宫内膜非三线型的妇女ART妊娠后易发生早期流产.冷冻胚胎复苏移植周期的早期自然流产率高于新鲜胚胎移植周期.

Abstract：

Objective To investigate the relative risk factors for early abortion among singleton pregnancies after assisted reproductive technology (ART) treatment. Methods A retrospective analysis was performed on 1636 singleton pregnancies, including 196 early abortion cases and 1195pregnancies with live birth after exclusion of those lost cases during follow-up, or complicated with uterine deformity, or oocyte receptor, or late abortion, or incomplete medical record, following in vitro fertilization(IVF)/ intracytoplasmic sperm injection (ICSI) treatment and the risk factors of early abortion were investigated. The early abortion rate was also compared between fresh IVF/ICSI group and frozen embryo transfer (FET) group (n=386). Results Multivariate Logistic regression analysis indicated that elder women (OR= 1. 143,95%CI: 1. 096-1. 196) and patients with polycystic ovarian syndrome (OR = 4. 309,95 % CI : 2. 564-7.243) were risk factors of spontaneous early abortion,and high mean score of transferred embryos (MSTE) (OR = 0. 808, 95% CI: 0. 717-0. 912) and endometrial triple-lined pattern on the day of human chorionic gonadotropin (hCG) administration (OR=0. 431, 95% CI: 0. 243-0.764)were protective factors. Significant difference were found in the maternal age [(32.22±4. 10) yrs vs (30.28±3. 66) yrs],the duration of infertility [(5. 90±4.26) yrs vs (5.20 ± 3. 32) yrs], basal serum follicle-stimulating hormone (FSH) level [(6. 35 ±2.30) mIU/ml vs (5.95±2.12) mIU/ml], number of transferred embryos (2. 31±0. 51) vs (2. 18±0.49), serum estradiol level on the day of hCG administration [(2467. 1 ± 1588. 8) pg/ml vs (2934. 5 ±1785.2) pg/ml] and MSTE (7.03 ±1.35 vs 7.74 ± 1.25) between the abortion group and livebirth group (all P＜0. 05). The spontaneous abortion rate was higher in the FET group than in the fresh embryo transfer group [17. 36%(67/386) vs 13.02% (213/1636), χ2 =4. 296, P=0. 023].Conclusions Women at elder age, or with long duration of infertility, high basal FSH level,polycystic ovarian syndrome, low MSTE, non-triple-lined pattern of endometrium on the day of hCG administration are at risk of spontaneous early abortion in pregnancies after ART. The rate of spontaneous abortion is higher in FET group than in fresh IVF/ICSI group.     

Early clinical features and risk factors for cesarean scar pregnancy: a retrospective case-control study

The aim of this study was to investigate early clinical features and risk factors for cesarean scar pregnancy (CSP). Study group of 206 CSP patients out of 6853 women with early pregnancies, diagnosed from 2014 to 2016 was compared with a randomly selected control group of 412 patients. Early clinical features for CSP were vaginal bleeding (OR: 9.65; 95% CI: 5.67–16.41), lower abdominal pain (OR: 3.8; 95% CI: 1.52–9.54) and increased white blood cells (OR: 1.30; 95% CI: 1.12–1.50). Important risk factors for CSP were artificial abortion within the last pregnancy (OR: 4.13; 95% CI: 2.23–7.66), 0?～?1?year and 2?～?3?year interval between present and last pregnancy (OR: 2.27; 95% CI: 1.11–4.67 and OR: 2.15; 95% CI: 1.15–4.03). Pregnancy problems are important issues within the scope of ‘Gynecological Endocrinology’. Vaginal bleeding and lower abdominal pain, although unspecific, could be early clinical symptoms of CSP, especially if main risk factors exist such as abortion within the last pregnancy and short interval to the last pregnancy. Knowing this can help for prevention and early diagnosis CSP which can reduce life-threatening complications such as massive hemorrhage and can avoid hysterectomy. Consequence also must be to avoid unwanted pregnancies by using effective contraception, especially in risk patients.     

Bacterial vaginosis as a risk factor for preterm delivery: a meta-analysis

OBJECTIVE: We performed a meta-analysis to evaluate bacterial vaginosis as a risk factor for preterm delivery. STUDY DESIGN: Selection criteria were (1). the data appeared in original, published English-language reports of prospective studies or control groups of clinical trials that included women at <37 weeks of gestation with intact amniotic membranes, (2). all the women had to have been screened for bacterial vaginosis that was diagnosed by either clinical criteria or criteria that were based on Gram stain findings, and (3). the outcomes were preterm delivery, spontaneous abortion, maternal or neonatal infection, and perinatal death. RESULTS: Eighteen studies with results for 20,232 patients were included. Bacterial vaginosis increased the risk of preterm delivery >2-fold (odds ratio, 2.19; 95% CI, 1.54-3.12). Higher risks were calculated for subgroups of studies that screened for bacterial vaginosis at <16 weeks of gestation (odds ratio, 7.55; 95% CI, 1.80-31.65) or at <20 weeks of gestation (odds ratio, 4.20; 95% CI, 2.11-8.39). Bacterial vaginosis also significantly increased the risk of spontaneous abortion (odds ratio, 9.91; 95% CI, 1.99-49.34) and maternal infection (odds ratio, 2.53; 95% CI, 1.26-5.08). No significant results were calculated for the outcome of neonatal infection or perinatal death. CONCLUSION: Bacterial vaginosis, early in pregnancy, is a strong risk factor for preterm delivery and spontaneous abortion.