The association between obstetrical interventions and late preterm birth

Bassil, Kate; Yasseen, Abdool S.; Walker, Mark; Sgro, Michael; Shah, Prakesh S.; Smith, Graeme N.; Campbell, Douglas M.; Mamdani, Muhammad; Sprague, Ann E.; Lee, Shoo K.; Maguire, Jonathon L.

doi:10.1016/j.ajog.2014.02.023

Cited by 19 publications

(14 citation statements)

References 22 publications

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“…Thus, the change of institution due to medical indication, particularly to tertiary medical institutions, might be associated with shortened gestational duration and preterm birth. In addition, our results were consistent with previous reports describing the association between cesarean section and preterm birth . Our sensitivity analysis using a multiple linear regression model excluding cesarean section cases showed similar results as found in our main analysis.…”

Section: Discussionsupporting

confidence: 92%

“…In addition, our results were consistent with previous reports describing the association between cesarean section and preterm birth. [12][13][14] Our sensitivity analysis using a multiple linear regression model excluding cesarean section cases showed similar results as found in our main analysis. Therefore, because there were no significant associations between institution change due to self-referral and gestational duration or preterm birth in the main and sensitivity analyses, it might be difficult to consider institution change due to self-referral as a risk factor for shortened gestational duration.…”

Section: Discussionsupporting

confidence: 84%

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Effect of medical institution change on gestational duration after the Great East Japan Earthquake: The Fukushima Health Management Survey

Suzuki

Goto

Fujimori

2016

J of Obstet and Gynaecol

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Aim: The aim of this study was to examine the association between medical institution change for perinatal care and gestational duration after the Great East Japan Earthquake using data from the Fukushima Health Management Survey. Methods: The data of pregnant women who experienced the earthquake in Fukushima prefecture and participated in the Pregnancy and Birth Survey as part of the Fukushima Health Management Survey were analyzed. The primary and secondary outcomes of this study were gestational duration and preterm birth, respectively. The main study factor was prenatal checkup institution (only one institution, changed institution due to selfreferral, changed institution due to medical indication, and went to parents' home for childbirth). Self-referral was considered as indicative of relocation after the disaster. Multiple linear and logistic regression analyses were conducted to examine the effect of earthquake on each outcome. Results: A total of 5593 (60.2%) participants experienced the earthquake between the 4th and 37th weeks of their gestational period. After controlling for variables, pregnant women who changed their perinatal checkup institution due to medical indication were significantly associated with shorter gestational duration (β = À10.6, P < 0.001) and preterm birth (adjusted odds ratio, 8.5; 95% confidence interval, 5.8-12.5) compared with women who visited only one institution. Self-referral, however, was not significantly associated with the outcomes. Conclusion: According to prenatal checkup status, our results suggest that the effect on gestational duration of the Great East Japan Earthquake and the subsequent Fukushima Daiichi nuclear disaster was not significant.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 84%

Effect of medical institution change on gestational duration after the Great East Japan Earthquake: The Fukushima Health Management Survey

Suzuki

Goto

Fujimori

2016

J of Obstet and Gynaecol

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“…Estimated risk ranged from 1.2 to 31.7 with incidence ranging from 5.8 to 80.1%, but the majority of studies reported between 40 and 60%. 1,2,8,15,17,[48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63] Approximately 50 to 80% of preterm births in the setting of abruption are spontaneous (preterm labor or membrane rupture), but abruption is also considered the fourth most common cause of medically indicated preterm birth. 50,64 Spontaneous preterm birth due to abruption is thought to be the result of bleeding from the separation of the placental which irritates the uterine lining and stimulates contractions which progress into preterm labor.…”

Section: Preterm Birth and Fetal Or Neonatal Sizementioning

confidence: 99%

Maternal, Labor, Delivery, and Perinatal Outcomes Associated with Placental Abruption: A Systematic Review

2017

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Objective Risk factors for placental abruption have changed, but there has not been an updated systematic review investigating outcomes. Methods We searched PubMed, EMBASE, Web of Science, SCOPUS, and CINAHL for publications from January 1, 2005 through December 31, 2016. We reviewed English-language publications reporting estimated incidence and/or risk factors for maternal, labor, delivery, and perinatal outcomes associated with abruption. We excluded case studies, conference abstracts, and studies that lacked a referent/comparison group or did not clearly characterize placental abruption. Results A total of 123 studies were included. Abruption was associated with elevated risk of cesarean delivery, postpartum hemorrhage and transfusion, preterm birth, intrauterine growth restriction or low birth weight, perinatal mortality, and cerebral palsy. Additional maternal outcomes included relaparotomy, hysterectomy, sepsis, amniotic fluid embolism, venous thromboembolism, acute kidney injury, and maternal intensive care unit admission. Additional perinatal outcomes included acidosis, encephalopathy, severe respiratory disorders, necrotizing enterocolitis, acute kidney injury, need for resuscitation, chronic lung disease, infant death, and epilepsy. Conclusion Few studies examined outcomes beyond the initial birth period, but there is evidence that both mother and child are at risk of additional adverse outcomes. There was also considerable variation in, or absence of, the reporting of abruption definitions.

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“…Provider behavior could have also influenced the prevalence of preterm birth in ways that cannot be analyzed. For example, because survival for preterm babies has improved significantly, providers might feel more comfortable with aggressive treatment options for complicated pregnancies, although new evidence is mixed regarding this theory [17,19,21,22]. Nevertheless, if this behavior change occurred in the study population, it was not reflected in improved neonatal health outcomes.…”

Section: Discussionmentioning

confidence: 99%

The increasing trend in preterm birth in public hospitals in northern Argentina

Weaver

Gibbons

Belizán

et al. 2015

Intl J Gynecology & Obste

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Objective To identify factors associated with the increasing incidence of preterm birth in northern Argentina. Methods In an observational study, data were reviewed from a prospective, population-based registry of pregnancy outcomes in six cities in 2009–2012. The primary outcome was preterm birth (at 20–37 weeks). Bivariate tests and generalized estimating equations were used within a conceptual hierarchical framework to estimate the cluster-corrected annual trend in odds of preterm birth. Results The study reviewed data from 11 433 live births. There were 484 (4.2%) preterm births. The incidence of preterm births increased by 38% between 2009 and 2012, from 37.5 to 51.7 per 1000 live births. Unadjusted risk factors for preterm birth included young or advanced maternal age, normal body mass index, nulliparity, no prenatal care, no vitamins or supplements during pregnancy, multiple gestation, and maternal hypertension or prepartum hemorrhage. The prevalence of many risk factors increased over the study period, but variations in these factors explained less than 1% of the increasing trend in preterm birth. Conclusion The incidence of preterm births in six small cities in northern Argentina increased greatly between 2009 and 2012. This trend was unexplained by the risk factors measured. Other factors should be assessed in future studies.

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The association between obstetrical interventions and late preterm birth

Cited by 19 publications

References 22 publications

Effect of medical institution change on gestational duration after the Great East Japan Earthquake: The Fukushima Health Management Survey

Effect of medical institution change on gestational duration after the Great East Japan Earthquake: The Fukushima Health Management Survey

Maternal, Labor, Delivery, and Perinatal Outcomes Associated with Placental Abruption: A Systematic Review

The increasing trend in preterm birth in public hospitals in northern Argentina

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