Impact of the "39-week rule" on adverse pregnancy outcomes: a statewide analysis.

BACKGROUND: The "39-week rule," adopted by the American College of Obstetricians and Gynecologists circa 2009, discouraged routine elective induction of labor in early-term gestations (37 weeks 0 days-38 weeks 6 days) to decrease the risk of adverse neonatal outcomes. However, little research exists regarding any unintended adverse pregnancy outcomes associated with this policy shift. OBJECTIVE: This study aimed to quantify the difference in incidence of adverse pregnancy outcomes before and after the implementation of the 39-week rule. STUDY DESIGN: Deidentified data from all births in the state of South Carolina from 2000 to 2008 (before the 39-week rule) and from 2013 to 2017 (after statewide implementation and enforcement of the rule) were obtained from the South Carolina Revenue and Fiscal Affairs Office. Demographic data and International Classification of Diseases 9/10 codes were obtained for each birth. Our primary outcome was the incidence of any of the following adverse pregnancy outcomes: cesarean delivery, hypertensive disorders, chorioamnionitis, postpartum hemorrhage, high-degree lacerations, placental abruption, and intensive care unit admission. Propensity score analysis was used to control for age, body mass index, and race. After stratification by propensity score, the Cochran-Mantel-Haenszel test was used to compare the prerule and postrule groups. RESULTS: A total of 633,985 births were eligible for inclusion-412,632 from 2000 to 2008, and 221,353 from 2013 to 2017. There was a significant increase in the primary outcome in the postrule period (39.94% pre vs 42.76% post; P<.01). The incidence of all hypertensive disorders was significantly increased in the postrule period compared with the prerule period (7.75% pre vs 10.1% post; P<.01). The incidence of chorioamnionitis and cesarean delivery also increased in the postrule period (1.45% pre vs 1.92% post; P<.01; 29.6% pre vs 31.82% post; P<.01; respectively). CONCLUSION: There was a significant increase in the primary outcome following the implementation of the 39-week rule. Although the policy shift was driven by a desire to decrease adverse neonatal outcomes, aggregate benefit was not observed for pregnancy outcomes.

Impact of restricting early-term deliveries on adverse neonatal outcomes: a statewide analysis.

BACKGROUND: The "39-Week Rule" was adopted by the American College of Obstetricians and Gynecologists in 2009 to eliminate nonmedically indicated (elective) deliveries before 39 weeks in an effort to improve neonatal outcomes. OBJECTIVE: Our primary objective was to quantify the effect of this policy change on adverse neonatal outcomes among a cohort of term births in South Carolina. STUDY DESIGN: Deidentified data from all births in the state of South Carolina from 2000 to 2008 (before the 39-week rule) and from 2013 to 2017 (after statewide implementation and enforcement of the rule) were obtained from the South Carolina Revenue and Fiscal Affairs Office. Demographic data and International Statistical Classification of Diseases and Related Health Problems Ninth/Tenth Revision codes were obtained for each birth. Our primary outcome was admission to a neonatal intensive care unit. Our secondary outcomes were respiratory morbidities (including respiratory distress syndrome and transient tachypnea of the newborn), hypoxic-ischemic encephalopathy, seizure, sepsis, birth injuries, hyperbilirubinemia, hypoglycemia, and feeding difficulties. Propensity score analysis was used to control for maternal age, body mass index, race, gestational hypertension, infection, placental abruption, and gestational and pregestational diabetes mellitus. After stratification by propensity score, the Cochran-Mantel-Haenszel test was used to compare groups. RESULTS: A total of 620,121 infants were liveborn at term during the 2 study periods. After implementation of the 39-week rule, there was a significant reduction in early-term deliveries. In adjusted analyses, neonatal intensive care unit admission was significantly more common in the postimplementation period. Respiratory morbidities were also significantly more common postimplementation. In contrast, there were significant reductions in birth injuries and hyperbilirubinemia in the postimplementation period. CONCLUSION: Implementation of the 39-week rule was associated temporally with an increase in adverse neonatal outcomes. The outcomes intended to be reduced by the 39-week rule, including neonatal intensive care unit admission and respiratory morbidity, seem to have increased in incidence despite adherence to the proposed guidelines.

Obstetric Anesthesia Workforce Survey: A 30-Year Update.

BACKGROUND: Obstetric Anesthesia Workforce Surveys were conducted in 1981, 1992, and 2001, and the 10-year update was conducted in 2012. Anesthesia providers from US hospitals were surveyed to identify the methods used to provide obstetric anesthesia. Our primary hypothesis was that the provision of obstetric anesthesia services has changed in the past 10 years. METHODS: A sample of hospitals was generated based on the number of births per year and US census region. Strata were defined as follows: I ≥ 1500 annual births (n = 341), II ≥ 500 to 1499 annual births (n = 438), and III < 500 annual births (n = 414). Contact email information for the anesthesia provider in charge of obstetric services was obtained by phone call. Electronic questionnaires were sent through email. RESULTS: Administration of neuraxial (referred to as "regional" in previous surveys) labor analgesia was available 24 hours per day in all stratum I hospitals responding to the survey. Respondents across all strata reported high rates of in-house coverage, with 86.3% (95% confidence interval [CI] = 82.7%-90%) of stratum I providers reporting that they provided in-house anesthesiology services for obstetrics. The use of patient-controlled epidural analgesia in stratum I hospitals was reported to be 35% in 2001 and 77.6% (95% CI = 73.2%-82.1%) in this survey. Independent Certified Registered Nurse Anesthetists were reported to provide obstetric anesthesia services in 68% (95% CI = 57.9%-77.0%) of stratum III hospitals. Although 76% (95% CI = 71.2%-80.3%) of responding stratum I hospitals allow postpartum tubal ligations, 14% report inadequate staffing to provide anesthesia either always or at off-hours. CONCLUSIONS: Since 2001, there have been significant changes in how responding hospitals provide obstetric anesthesia care and staff the labor and delivery ward. Obstetric anesthesia surveys, updated every 10 years, continue to provide information about changes in obstetric anesthesia practice.