Dataset Information

Contraceptive Use and the Risk of Ectopic Pregnancy: A Multi-Center Case-Control Study.

ABSTRACT:

Objective

To evaluate the association between the risk of ectopic pregnancy (EP) and the use of common contraceptives during the previous and current conception/menstrual cycle.

Methods

A multi-center case-control study was conducted in Shanghai. Women diagnosed with EP were recruited as the case group (n?=?2,411). Women with intrauterine pregnancy (IUP) (n?=?2,416) and non-pregnant women (n?=?2,419) were matched as controls at a ratio of 1?1. Information regarding the previous and current use of contraceptives was collected. Multivariate logistic regression analyses were performed to calculate odds ratios (ORs) and the corresponding 95% confidential intervals (CIs).

Results

Previous use of intrauterine devices (IUDs) was associated with a slight risk of ectopic pregnancy (AOR1?=?1.87 [95% CI: 1.48-2.37]; AOR2?=?1.84 [1.49-2.27]), and the risk increased with the duration of previous use (P1 for trend <10-4, P2 for trend <10-4). The current use of most contraceptives reduced the risk of both unwanted IUP (condom: AOR?=?0.04 [0.03-0.05]; withdrawal method: AOR?=?0.10 [0.07-0.13]; calendar rhythm method: AOR?=?0.54 [0.40-0.73]; oral contraceptive pills [OCPs]: AOR?=?0.03 [0.02-0.08]; levonorgestrel emergency contraception [LNG-EC]: AOR?=?0.22 [0.16-0.30]; IUDs: AOR?=?0.01 [0.005-0.012]; tubal sterilization: AOR?=?0.01 [0.001-0.022]) and unwanted EP (condom: AOR1?=?0.05 [0.04-0.06]; withdrawal method: AOR1?=?0.13 [0.09-0.19]; calendar rhythm method: AOR1?=?0.66 [0.48-0.91]; OCPs: AOR1?=?0.14 [0.07-0.26]; IUDs: AOR1?=?0.17 [0.13-0.22]; tubal sterilization: AOR1?=?0.04 [0.02-0.08]). However, when contraception failed and pregnancy occurred, current use of OCPs (AOR2?=?4.06 [1.64-10.07]), LNG-EC (AOR2?=?4.87 [3.88-6.10]), IUDs (AOR2?=?21.08 [13.44-33.07]), and tubal sterilization (AOR2?=?7.68 [1.69-34.80]) increased the risk of EP compared with the non-use of contraceptives.

Conclusion

Current use of most contraceptives reduce the risk of both IUP and EP. However, if the contraceptive method fails, the proportions of EP may be higher than those of non-users. In the case of contraceptive failure in the current cycle, EP cases should be differentiated according to current use of OCPs, LNG-EC, IUDs, and tubal sterilization. In addition, attention should be paid to women with previous long-term use of IUDs.

SUBMITTER: Li C

PROVIDER: S-EPMC4262460 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Contraceptive Use and the Risk of Ectopic Pregnancy: A Multi-Center Case-Control Study.

Li Cheng C Zhao Wei-Hong WH Meng Chun-Xia CX Ping Hua H Qin Guo-Juan GJ Cao Shu-Jun SJ Xi Xiaowei X Zhu Qian Q Li Xiao-Cui XC Zhang Jian J

PloS one 20141210 12

<h4>Objective</h4>To evaluate the association between the risk of ectopic pregnancy (EP) and the use of common contraceptives during the previous and current conception/menstrual cycle.<h4>Methods</h4>A multi-center case-control study was conducted in Shanghai. Women diagnosed with EP were recruited as the case group (n = 2,411). Women with intrauterine pregnancy (IUP) (n = 2,416) and non-pregnant women (n = 2,419) were matched as controls at a ratio of 1∶1. Information regarding the previous an ...[more]

PMID: 25493939

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Project description:BackgroundEctopic pregnancy is an abnormal condition in which implantation of the blastocyst occurs outside the endometrium of the uterus. It is gynecological important, particularly in the developing world, because of associated with enormous rate of high morbidity, during the first trimester of pregnancy. A better understanding of its risk factors can help to prevent its prevalence. However, the determinants of ectopic pregnancy are not well understood and few researches conducted in our country were based on secondary data covering small scale area. This study aimed to identify determinants of ectopic pregnancy among pregnant women attending referral hospitals in Southwestern part of Oromia regional state, Southwest Ethiopia.MethodsHospital-based case control study was employed from June 1 to September 30, 2019. The study was conducted in five referral hospitals in Southwestern part of Oromia regional state. Final sample size includes 59 cases and 118 controls. Data were entered by using Epidata version 3.1 and analyzed using SPSS version 23. Descriptive statistics were used to explore the data. All explanatory variables with p-value of < 0.25 in bi-variable analysis, then entered into multivariable logistic regression. Associated factors were identified at 95% confidence interval (p < 0.05).ResultsOut of 177 (59 cases and 118 controls) participants, 174 (58 cases and 116 controls) were participating in the study. Prior two or more induced abortions [AOR = 3.95:95% CI: 1.22-13.05], previous history of caesarean section [AOR = 3.4:95% CI: 1.11-10.94], marital status (being single) [AOR = 4.04:95%CI: 1.23-13.21], reporting prior recurrent sexual transmitted infection [AOR = 2.25:95%CI: 1.00-5.51], prior history of tubal surgery [AOR = 3.32:95%CI: 1.09-10.13], were more likely to have an ectopic pregnancy with their respective AOR with 95%CI.ConclusionIt was found that having a history of more than two induced abortions during previous pregnancies, marital status (single), recurrent sexual transmitted infection, prior history of tubal surgery and experiencing prior caesarean section were found to be determinants of ectopic pregnancy. Hospitals should give emphasis on prevention and early detection of risks of ectopic pregnancy and create awareness in order to reduce the burden of ectopic pregnancy.

Project description:In normal pregnancy, the egg is fertilized in the fallopian tube. It later moves into the uterus, where it implants into the uterine endometrium. Therefore, implantation of the fertilized egg into the endometrium is not observed in many women using contraceptives. However, if the fallopian tubes are diseased or abnormal, the fertilized egg cannot travel to the endometrium. Thus, the fertilized egg is implanted in tissues other than the uterus, resulting in an ectopic pregnancy. In most cases of ectopic pregnancy, the fertilized egg is implanted into the left or right fallopian tube or in tissues other than the fallopian tubes such as the ovary. With laparoscopic surgery, the scars are small, and the pain and physical burden are also much lesser than those with open surgery; thus, the patient can be rehabilitated immediately. Laparoscopic surgery is preferred for the termination of ectopic pregnancies because the patients recovered quickly physically after surgery and can be discharged in a short period. This paper presents our experience in treating a 37-year-old woman who had a tubal pregnancy despite using a contraceptive. Contrast-enhanced magnetic resonance imaging showed a gestational sac within the right fallopian tube. Laparoscopic surgery was performed to resect the right fallopian tube. Pathological examination suggested that the ectopic pregnancy occurred at the organogenesis stage 9 weeks after fertilization. The pathological findings revealed subpopulations of cells from the ectoderm that were separated from other cells and more specifically formed spinal and ovarian structures. The implantation of the fertilized egg into the endometrium is not observed in many women using contraceptives. However, in rare cases, ectopic pregnancy occurs in women using contraceptives; thus, caution is necessary in diagnosis and treatment. This report presents valuable surgical pathological findings from such a rare case of ectopic pregnancy to understand the differentiation into each tissue during organogenesis.

Project description:Study questionAre women who fill a benzodiazepine prescription before conception at increased risk of ectopic pregnancy?Summary answerRisk of ectopic pregnancy is 50% higher among women who fill a benzodiazepine prescription before conception.What is known alreadyBenzodiazepine use in pregnancy increases the risk of miscarriage, adverse birth outcomes and adverse child development outcomes.Study design, size, durationUsing data from US commercial insurance claims, we performed a cohort study of 1 691 366 pregnancies between 1 November 2008 and 30 September 2015.Participants/materials, setting, methodsWe identified ectopic pregnancies using diagnosis and procedure codes and used unadjusted and inverse probability of treatment (IPT)-weighted log-binomial models to calculate relative risks (RR) of ectopic pregnancy for pregnant women who did and did not fill any prescriptions for benzodiazepines in the 90 days before conception. Two sub-groups of women with specific indications for benzodiazepine use were also examined-women who had a least one diagnosis for anxiety disorder and women who had at least one diagnosis of insomnia in the year before conception.Main results and the role of chanceOf the 1 691 366 pregnancies, 1.06% filled at least two benzodiazepine prescriptions totaling at least 10 days supply in the 90 days before conception. Among women with a benzodiazepine prescription, there was an excess of 80 ectopic pregnancies per 10 000 pregnancies, and their IPT-weighted risk of ectopic pregnancies was 1.47 (95% CI 1.32 to 1.63) times greater relative to women without benzodiazepine prescriptions before conception. The IPT-weighted RR between ectopic pregnancy and benzodiazepine use was 1.34 (95% CI 1.18 to 1.53) among women with anxiety disorder diagnoses and 1.28 (95% CI 0.99 to 1.68) among women with an insomnia diagnosis.Limitations, reasons for cautionWe relied on outpatient prescription data to identify benzodiazepine use before conception, which could result in over- or under-estimation of actual benzodiazepine consumption. We relied on medical claim codes to identify pregnancies and conception date, which may result in misclassification of pregnancy outcomes and gestational length.Wider implications of the findingsThis study found that women who have a benzodiazepine prescription before conception are at an increased risk of ectopic pregnancy. This information can help women, and their healthcare providers make more fully informed decisions about benzodiazepine use in their reproductive years.Study funding/competing interest(s)Funding for this project was provided by a Banting Postdoctoral Fellowship and a Stanford Maternal and Child Health Research Institute Postdoctoral Award. Data access for this project was provided by the Stanford Center for Population Health Sciences Data Core. The PHS Data Core is supported by a National Institutes of Health National Center for Advancing Translational Science Clinical and Translational Science Award (UL1 TR001085) and internal Stanford funding. The authors have no competing interest.Trial registration numberN/A.

Dataset Information

Contraceptive Use and the Risk of Ectopic Pregnancy: A Multi-Center Case-Control Study.

Objective

Methods

Results

Conclusion

Publications

Contraceptive Use and the Risk of Ectopic Pregnancy: A Multi-Center Case-Control Study.

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