The relation of obstetrical volume and nursery level to perinatal mortality

Perinatal Outcomes According to Accessibility to Maternal-Fetal and Neonatal Intensive Care Units by Region in Korea

BACKGROUND

Herein, we aimed to evaluate the maternal mortality ratio and perinatal mortality rate for different perinatal medical care service areas (PMCSAs), which were established by considering their geographical accessibility to maternal-fetal intensive care units (MFICUs) and neonatal intensive care units (NICUs), and to compare the PMCSAs according to their accessibility to these perinatal care services.

METHODS

Based on the 70 hospital service areas (HSAs) across the country confirmed through the Dartmouth Atlas methodology analysis and gathering of expert opinions, the PMCSAs were designated by merging HSAs without MFICUs and NICUs to the nearest HSA that contained MFICUs and NICUs, based on which MFICU and NICU could be reached within the shortest amount of time from population-weighted centroids in HSAs. PMCSAs where 30% or more of the population could not access MFICUs and NICUs within 60 minutes were identified using the service module ArcGIS and were defined as having access vulnerability.

RESULTS

Thirty-three of 70 HSAs in the country did not contain MFICUs and NICUs, and 39 PMCSAs were finally derived by merging 70 HSAs. Ten of 39 PMCSAs (25.6%) were classified as having access vulnerability to MFICUs and NICUs. The national maternal mortality ratio was 9.42, with the highest ratio seen in the region of Wonju (25.86) and the lowest in Goyang (2.79). The national perinatal mortality rate was 2.86, with the highest and lowest rates observed in the Gunsan (4.04) and Sejong (1.99) regions, respectively. The perinatal mortality rates for areas vulnerable and invulnerable to maternal and neonatal healthcare accessibility were 2.97 and 2.92, respectively, but there was no statistically significant difference in this rate (P = 0.789). The maternal mortality ratio for areas vulnerable and invulnerable to maternal and neonatal healthcare accessibility were 14.28 and 9.48, respectively; this ratio was significantly higher in areas vulnerable to accessibility (P = 0.022).

CONCLUSION

Of the PMCSAs across the country, 25.6% (10/39) were deemed to be vulnerable to MFICU and NICU accessibility. There was no difference in the perinatal mortality rate between the vulnerable and invulnerable areas, but the maternal mortality ratio in vulnerable areas was significantly higher than that in invulnerable areas.

Access to risk-appropriate hospital care and disparities in neonatal outcomes in racial/ethnic groups and rural-urban populations

Variations in infant and neonatal mortality continue to persist in the United States and in other countries based on both socio-demographic characteristics, such as race and ethnicity, and geographic location. One potential driver of these differences is variations in access to risk-appropriate delivery care. The purpose of this article is to present the importance of delivery hospitals on neonatal outcomes, discuss variation in access to these hospitals for high-risk infants and their mothers, and to provide insight into drivers for differences in access to high-quality perinatal care using the available literature. This review also illustrates the lack of information on a number of topics that are crucial to the development of evidence-based interventions to improve access to appropriate delivery hospital services and thus optimize the outcomes of high-risk mothers and their newborns.

The changing landscape of perinatal regionalization

Regionalization, which emphasizes matching patient needs with the capabilities of the hospital in which care is provided, has long been a recommended approach to reducing neonatal morbidity and mortality. Over the past decade, research methods surrounding the measurement and evaluation of such programs have improved, thus strengthening arguments for implementation of these strategies. However, regionalization policies vary widely across regions and between countries, with potential impacts on neonatal outcomes as well as costs of care. It is important to account for geographic and other regional differences when determining the feasibility of regionalization for a specific region, as certain areas and populations may need particular consideration in order for regionalization policies to be successful.

Interfacility Transport of the Pregnant Patient: A 5-year Retrospective Review of a Single Critical Care Transport Program

INTRODUCTION

Interfacility transport of the pregnant patient poses a challenge for prehospital providers as it is an infrequent but potentially high acuity encounter. Knowledge of clinically significant events (CSEs) that occur during these transports is important both to optimize patient safety and also to help enhance crew training and preparedness. This study evaluated a critical care transport program's 5-year longitudinal experience transporting pregnant patients by ground and air, and described CSEs that occurred during the out-of-hospital phase of care.

METHODS

This study was a retrospective review of pregnant patients transported by a single critical care transport system into and within a large academic healthcare system. Patients who were pregnant, and were transported from a referring facility to one of the 2 receiving centers within Johns Hopkins Health System between January 1, 2012 and December 31, 2016 were included in this study. The primary outcome of interest was the occurrence of a predefined clinically significant event (CSE) during transport, while a secondary outcome of interest was the indication for transfer.

RESULTS

During the study period 1,223 pregnant patients were transported by our critical care transport service. There were 1,101 patients who met inclusion criteria; 693 (62.9%) of whom were transported by ground and 408 (37.1%) who were transported by rotor wing aircraft. The top 3 indications for transfer comprised 71.4% of all patients and included; preterm labor, hypertensive disorder of pregnancy, and other maternal life threatening disorder. The most common events that occurred across all transports were: exacerbation of hypertensive disease requiring intervention (4.5%), hypotension (1.3%), and altered mental status (0.2%).

CONCLUSIONS

Incidence of CSEs during the interfacility transport of pregnant patients within our critical care transport system is low (6.0%). Knowledge of the clinically significant events that occur during EMS transport is a vital component of ensuring system quality and optimizing patient safety. This data can be used to augment and focus provider education and training to mitigate and optimize response to future events.

The impact of increased number of low-risk deliveries on maternal and neonatal outcomes: A retrospective cohort study in Finland in 2011-2015

OBJECTIVES

Our aim was to demonstrate the influence of increased number of low-risk deliveries on obstetric and neonatal outcome.

STUDY DESIGN

The study hospital was Kätilöopisto Maternity Hospital in Helsinki. Simultaneously, we studied all three delivery units in the Helsinki region in the population-based analysis. The study population was singleton hospital deliveries occurring between 2011 and 2012, and 2014-2015. The study hospital included 11 237 and 15 637 births and the population-based group included 28 950 and 27 979 births. We compared outcome measures in different periods by calculating adjusted odds ratios (AOR). Main outcome measures were induced delivery, mode of delivery, third or fourth degree perineal tear, Apgar score at five minutes <7, umbilical artery pH <7.00, transfer to higher level of neonatal care, neonatal antibiotic treatment, respiratory support of the neonate, hospitalization of the neonate >7 days, and perinatal death.

RESULTS

In the study hospital, induction rate increased from 22.4% to 24.8% (AOR 1.06, 95% CI; 1.00-1.12) while in the population-based analysis the rate decreased from 22.2% to 21.5% (AOR 0.96, 95% CI; 0.92-1.00). Percentage of neonatal transfers, low Apgar scores, and severe perineal tears increased both in study hospital and in population-based group. Changes in operative delivery rate and other adverse perinatal outcomes were statistically insignificant.

CONCLUSIONS

Increasing the volume of a delivery unit does not compromise maternal or neonatal outcome. Specific characteristics of a delivery unit affect the volume outcome association.

Perinatal legislative policies and health outcomes

Perinatal epidemiology examines the variation and determinants of pregnancy outcomes from a maternal and neonatal perspective. However, improving public and population health also requires the translation of this evidence base into substantive public policies. Assessing the impact of such public policies requires sufficient data to include potential confounding factors in the analysis, such as coexisting medical conditions and socioeconomic status, and appropriate statistical and epidemiological techniques. This review will explore policies addressing three areas of perinatal medicine-elective deliveries prior to 39 weeks' gestation; perinatal regionalization; and mandatory paid maternity leave policies-to illustrate the challenges when assessing the impact of specific policies at the patient and population level. Data support the use of these policies to improve perinatal health, but with weaker and less certain effect sizes when compared to the initial patient-level studies. Improved data collection and epidemiological techniques will allow for improved assessment of these policies and the identification of potential areas of improvement when translating patient-level studies into public policies.

Impact of surgeon annual volume on short-term maternal outcome in cesarean delivery

BACKGROUND

The annual procedure volume is an accepted marker for quality of care and has been documented in various medical fields. Surgeon volume has been shown to correlate with morbidity and mortality rates in surgical and high-risk medical procedures. Although cesarean delivery is 1 of the most common surgical procedures in the United States, the link between a surgeon's annual cesarean delivery volume and maternal outcome has never been tested.

OBJECTIVE

The purpose of this study was to evaluate the impact of a surgeon's annual volume on short-term maternal outcome in cesarean deliveries.

STUDY DESIGN

We performed a retrospective cohort study in a single tertiary center between 2006 and 2013. Cesarean deliveries were categorized into 2 groups based on the annual volume of cesarean delivery of the attending obstetrician. The "low" group included obstetricians with a low annual volume, whose annual volume of cesarean delivery was lower than median. The "high" group comprised obstetricians with a high annual volume whose annual volume was at median and above. Further analyses were done for quartiles and for 4 clinical relevant groups according to the annual number of cesarean deliveries that were performed/supervised by the attending obstetrician (≤20, 21-60, 61-120, and >120). The primary outcome was a composite adverse maternal outcome that included ≥1 of the following outcomes: urinary or gastrointestinal tract injuries, hemoglobin drop >3 g/dL, blood transfusion, relaparotomy, puerperal fever, prolonged maternal hospitalization, and readmission. Secondary outcomes were operative times (skin incision to delivery and overall).

RESULTS

A total of 11,954 cesarean deliveries were included; the median annual number of cesarean deliveries that were performed/supervised by 1 obstetrician was 48. Unadjusted analysis suggested that the patients in the high group had fewer urinary and gastrointestinal injuries (18/9278 [0.2%] vs 16/2676 [0.6%] injuries; P < .001), less blood loss as measured by hemoglobin drop >3 g/dL (1053/9278 [11.5%] vs 366/2676 [13.8%]; P < .001), and fewer cases of prolonged maternal hospitalization (80/9278 [0.9%] vs 39/2676 [1.5%]; P = .006). The rate of blood transfusion, relaparotomy, puerperal febrile morbidity, and readmission to hospital did not differ between groups. Multivariable regression analysis showed that cesarean delivery performed/supervised by the high group resulted in a significantly lower composite adverse maternal outcome (15.8% vs 18.9%; odds ratio, 0.86; 95% confidence interval, 0.78-0.95; P = .004). This was related primarily to a decreased frequency of urinary and gastrointestinal injuries, lower likelihood of hemoglobin drop >3 g/dL, and lower incidence of prolonged maternal hospitalization. Operative times were significantly shorter for the high group. Composite adverse maternal outcome ranged from 21.8% in the lowest quartile to 17.9% in quartile 2, to 17.4% in quartile 3, and 15.6% in quartile 4. quartile 4 served as the reference; quartile 3 had an odds ratio of 1.14 (95% confidence interval, 1.01-1.29; P = .029); quartile 2 had an odds ratio of 1.18 (95% confidence interval, 1.02-1.36; P = .021, and quartile 1 had an odds ratio of 1.51 (95% confidence interval, 1.14-1.99; P = .004) for composite adverse maternal outcome. Composite adverse maternal outcome ranged from 21.5% in clinical group 1 to 17.5% in clinical group 2, to 17.9% in clinical group 3, and 15.2% in clinical group 4 (P = .001). Cesarean delivery performed/supervised by clinical groups 2, 3, and 4 in comparison with clinical group 1 were associated with a statistically significant risk reduction, (23%, 25%, and 34% respectively).

CONCLUSION

Maternal composite morbidity is decreased as the volume of cesarean deliveries that are performed or supervised by obstetricians increases.

The safety of Canadian rural maternity services: a multi-jurisdictional cohort analysis

Background

Small Canadian rural maternity services are struggling to maintain core staffing and remain open. Existing evidence states that having to travel to access maternity services is associated with adverse outcomes. The goal of this study is to systematically examine rural maternal and newborn outcomes across three Canadian provinces.

Methods

We analyzed maternal newborn outcomes data through provincial perinatal registries in British Columbia, Alberta and Nova Scotia for deliveries that occurred between April 1st 2003 and March 31st 2008. All births were allocated to maternity service catchments based on the residence of the mothers. Individual catchments were stratified to service levels based on distance to access intrapartum maternity services or the model of maternity services available in the community. The amalgamation of analyses from each jurisdiction involved comparison of logistic regression effect estimates.

Results

The number of singleton births included in the study is 150,797. Perinatal mortality is highest in communities that are greater than 4 h from maternity services overall. Rates of prematurity at less than 37 weeks gestation are higher for rural women without local access to services. Caesarean section rates are highest in communities served by general surgical models.

Conclusion

Composite analysis of data from three Canadian provinces provides the strongest evidence to date demonstrating that we need to sustain small community maternity services with and without caesarean section capability.

Neonatal care in Brazil: hospital structure and adequacy according to newborn obstetric risk

BACKGROUND

In Brazil, hospital birth care is available to all, but there are important differences between hospitals in the public and private sectors, geographical regions and capitals/inland cities, resulting in inequalities of infant health.

AIMS

To assess the hospital structure for birth care in Brazil and analyze hospital adequacy to care for newborns according to levels of risk.

METHODS

Data were collected as part of a nationwide hospital-based cohort study, 'Birth in Brazil'. The hospitals were classified according to whether they had a neonatal intensive care unit and divided into two models of governance: public and private financing. Three structure domains were assessed: human resources, medications and equipment for post-natal women and newborn emergency care. Newborns were classified according to the obstetric risk.

RESULTS

There are more NICUs in private hospitals and they cater mostly for low obstetric risk newborns; the public sector serves 50% of at-risk patients in hospitals without an NICU. The differences between hospital service structures according to geographic region and capital/inland cities were evident. Hospitals in less developed regions and inland cities had poorer adequacy in the three domains.

CONCLUSION

The distribution of neonatal care to Brazilian infants varied between the public and private sectors. The public sector offered less complex services for newborns at risk, and infants without obstetric risk were born in facilities with an NICU, creating the possibility of unnecessary intervention, especially in the private sector.

The effectiveness of regionalization of perinatal care services--a systematic review

BACKGROUND

Several reports recommend the implementation of perinatal regionalization for improvements in maternal and neonatal outcomes, while research evidence on the effectiveness of perinatal regionalization has been limited. The interventional studies have been assessed for robust evidence on the effectiveness of perinatal regionalization on improving maternal and neonatal health outcomes.

METHODS

Bibliographic databases of Medline, EMbase, EconLit, HMIC have been searched using sensitive search terms for interventional studies that reported important patient or process outcomes. At least two authors assessed eligibility for inclusion and the risk of biases and extracted data from the included studies. As meta-analysis was not possible, a narrative analysis as well as a 'vote-counting' analysis has been conducted for important outcomes.

RESULTS

After initial screenings 53 full text papers were retrieved. Eight studies were included in the review from the USA, Canada and France. Studies varied in their designs, and in the specifications of the intervention and setting. Only three interrupted time series studies had a low risk of bias, of which only one study reported significant reductions in neonatal and infant mortality. Studies of higher risk of bias were more likely to report improvements in outcomes.

CONCLUSIONS

Implementing perinatal regionalization programs is correlated with improvements in perinatal outcomes, but it is not possible to establish a causal link. Despite several high profile policy statements, evidence of effect is weak. It is necessary to assess the effectiveness of perinatal regionalization using robust research designs in a more diverse range of countries.

Estrutura das maternidades: aspectos relevantes para a qualidade da atenção ao parto e nascimento

Avaliar aspectos da estrutura de uma amostra de maternidades do Brasil. A estrutura foi avaliada tendo como referências as normas do Ministério da Saúde e englobou: localização geográfica, volume de partos, existência de UTI, atividade de ensino, qualificação de recursos humanos, disponibilidade de equipamentos e medicamentos. Os resultados evidenciam diferenças na qualificação e na disponibilidade de equipamentos e insumos dos serviços de atenção ao parto e nascimento segundo o tipo de financiamento, regiões do país e grau de complexidade. As regiões Norte/Nordeste e Centro-oeste apresentaram os maiores problemas. No Sul/Sudeste, os hospitais estavam melhores estruturados, atingindo proporções satisfatórias em vários dos aspectos estudados, próximas ou mesmo superiores ao patamar da rede privada. O presente estudo traz para o debate a qualidade da estrutura dos serviços hospitalares ofertados no país, e sublinha a necessidade de desenvolvimento de estudos analíticos que considerem o processo e os resultados da assistência.

Regionalization and local hospital closure in Norwegian maternity care--the effect on neonatal and infant mortality

OBJECTIVE

To study whether neonatal and infant mortality, after adjustments for differences in case mix, were independent of the type of hospital in which the delivery was carried out.

DATA

The Medical Birth Registry of Norway provided detailed medical information for all births in Norway.

STUDY DESIGN

Hospitals were classified into two groups: local hospitals/maternity clinics versus central/regional hospitals. Outcomes were neonatal and infant mortality. The data were analyzed using propensity score weighting to make adjustments for differences in case mix between the two groups of hospitals. This analysis was supplemented with analyses of 13 local hospitals that were closed. Using a difference-in-difference approach, the effects that these closures had on neonatal and infant mortality were estimated.

PRINCIPAL FINDING

Neonatal and infant mortality were not affected by the type of hospital where the delivery took place.

CONCLUSION

A regionalized maternity service does not lead to increased neonatal and infant mortality. This is mainly because high-risk deliveries were identified well in advance of the birth, and referred to a larger hospital with sufficient perinatal resources to deal with these deliveries.

Does facility based newborn care improve neonatal outcomes? A review of evidence

CONTEXT

Facility based newborn care is gaining importance as an intervention aiming at reduction of neonatal mortality.

OBJECTIVE

To assess different factors that affect effectiveness of facility based newborn care on neonatal outcomes.

EVIDENCE ACQUISITION

Electronic search using key search engines along with search of grey literature manually. Observational and interventional studies published between 1966-Aug 2010 in English having a change in neonatal mortality as an outcome measure were considered.

RESULTS

A total of 40 articles were fully reviewed for generating synthesized evidence. All were observational studies. The exposure variables that affected neonatal outcomes were grouped into three categories- regionalization of perinatal care (17 articles), strengthening of lower level neonatal facilities (12), and other miscellaneous factors (11). Regionalization played a key role in advancing newborn care practices. It increased in-utero transfer of high risk newborns and improved survival outcomes especially for very low birth weight neonates at level III facilities. It led to reduction in neonatal mortality owing primarily to enhanced survival of low birth weight infants. Strengthening of lower level units contributed significantly in reducing neonatal mortality. High patient volume (>2,000 deliveries/year), inborn status, availability of referral system and inter-facility transfers, and adequate nursing care staff in neonatal units also demonstrated protective effect in averting neonatal deaths.

CONCLUSIONS

Countries investing in facility based newborn care should give impetus to establishing regionalized systems of perinatal care. Strengthening of lower level units with high case loads, can yield optimal reduction in NMR.

Comparison of neonatal outcomes and intrapartum events in full term vaginal deliveries conducted by staff versus resident physicians

Objective

The objective of this study was to compare the neonatal outcomes and intrapartum events conducted by staff versus resident physicians in full term vaginal deliveries.

Methods

We divided study population (n = 5,007) into two groups: staff versus resident physicians. These two groups were sub-divided; faculty versus fellow and senior versus junior resident, respectively. The maternal characteristics, neonatal outcomes including Apgar score, admission to the neonatal intensive care unit and umbilical arterial pH and intrapartum event which was defined as the occurrence of shoulder dystocia and vacuum delivery were also investigated.

Results

There was no difference in neonatal outcomes between two groups. The group delivered by staff had a higher rate of nulliparity, large for gestational age and intrapartum events than the resident physician group. The subgroup analysis revealed a higher rate of vacuum delivery in the group delivered by faculty and senior members than the group delivered by fellows and junior members.

Conclusion

There was no significant difference in neonatal outcomes between the two groups; staff versus resident physicians in full term vaginal deliveries in low-risk pregnant women. Also, experienced obstetricians might tend to participate in difficult labors and would prefer applying vacuum compared to the obstetricians with fewer experiences.

Evaluating the effect of hospital and insurance type on the risk of 1-year mortality of very low birth weight infants: controlling for selection bias

OBJECTIVES

We examined the effect of hospital type and medical coverage on the risk of 1-year mortality of very low birth weight (VLBW) infants while adjusting for possible selection bias.

METHODS

The study population was limited to singleton live birth infants having birth weight between 500 and 1500 g with no congenital anomalies who were born in Arkansas hospitals between 2001 and 2007. Propensity score (PS) matching and PS covariate adjustment were used to mitigate selection bias. In addition, a conventional multivariable logistic regression model was used for comparison purposes.

RESULTS

Generally, all 3 analytical approaches provided consistent results in terms of the estimated relative risk, absolute risk reduction, and the number needed to treat. Using the PS matching method, VLBW infants delivered at a hospital with a neonatal intensive care unit (NICU) were associated with a 35% relative decrease (95% bootstrap confidence interval, 18.5%-48.9%) in the risk of 1-year mortality as compared with those infants delivered at non-NICU hospitals. Furthermore, our results showed that on average, 16 VLBW infants (95% bootstrap confidence interval, 11-32), would need to be delivered at a hospital with an NICU to prevent 1 additional death at 1 year. However, there was not a difference in the risk of 1-year mortality between VLBW infants born to Medicaid-insured versus non-Medicaid-insured women.

CONCLUSIONS

Estimated relative risk of infant mortality was significantly lower for births that occurred in hospitals with an NICU; therefore, greater efforts should be made to deliver VLBW neonates in an NICU hospital.

Regionalized systems of perinatal care: health policy considerations

Over the past 2 decades, perinatal and neonatal health care has become less coordinated and more competitive in the United States. The impact at the state level has been the evolution of a fragmented, perinatal system with limited access and poorer outcomes. The evidence demonstrates lower mortality risk for very low-birth-weight infants born in designated tertiary centers. Regionalized systems of perinatal care are recommended to ensure that each mother and newborn achieve optimal outcomes. This article discusses the factors impacting implementation of this model at either the state or federal level as well as the incorporation of perinatal regionalization as part of the national agenda of health care reform.

The regionalization of pediatric health care

Regionalization of health care is a method of providing high-quality, cost-efficient health care to the largest number of patients. Within pediatric medicine, regionalization has been undertaken in 2 areas: neonatal intensive care and pediatric trauma care. The supporting literature for the regionalization of these areas demonstrates the range of studies within this field: studies of neonatal intensive care primarily compare different levels of hospitals, whereas studies of pediatric trauma care primarily compare the impact of institutionalizing a trauma system in a single geographic region. However, neither specialty has been completely regionalized, possibly because of methodologic deficiencies in the evidence base. Research with improved study designs, controlling for differences in illness severity between different hospitals; a systems approach to regionalization studies; and measurement of parental preferences will improve the understanding of the advantages and disadvantages of regionalizing pediatric medicine and will ultimately optimize the outcomes of children.

The effect of neonatal intensive care level and hospital volume on mortality of very low birth weight infants

OBJECTIVE

To determine the adjusted effect of hospital level of care and volume on mortality of very low birth weight (VLBW) infants in the state of California, where deregionalization of perinatal care has occurred.

RESEARCH DESIGN

Secondary data analysis of California maternal-infant hospital discharge data from 1997 to 2002 was performed. Logistic regression was used to evaluate the odds of mortality among VLBW infants by hospital level of neonatal intensive care and volume of VLBW deliveries, in the context of differences in antenatal and delivery factors by hospital site of delivery.

RESULTS

Both maternal and fetal antenatal risk profiles and delivery characteristics vary by hospital site of delivery. After risk adjustment, lower-level, lower-volume units were associated with a higher odds of mortality. The highest odds of mortality occurred in level-1 units with < or =10 VLBW deliveries per year (odds ratio, 1.69; 95% confidence interval, 1.43-1.99). In isolation, hospital volume, rather than level of care, had the greater effect.

CONCLUSIONS

Although deregionalization of perinatal services may increase access to care for high-risk mothers and newborns, its impact on hospital volume may outweigh its potential benefit.

Intracranial haemorrhage after transport of premature newborns

Intracranial hemorrhage remains an important factor of premature newborns? morbidity. Its incidence is significantly influenced by adequate perinatal care and safe neonatal transport. Risk factors for the development of intracranial hemorrhage in premature newborns after neonatal transport were analyzed in the retrospective transversal clinical study. Out of 150 study subjects, 60% (n=90/150) had intracranial hemorrhage with a statistically significant difference in relation to Apgar score, gestational age, birth weight, age at the moment of transport and the prophylactic use of surfactant. In this group, grades I/II intracranial hemorrhage were detected in 77% (n=69/90), while grades III/IV intracranial hemorrhage were diagnosed in 23% (n=21/90). A statistically significant difference was observed in relation to gestational age, birth weight, antenatal use of tocolytics and steroids, delivery mode and age in the time of transport between these groups. All patients were transferred to Intensive Care Unit, the duration of transport was less than 5 minutes in 71% 9n=107/150), whereas longer transport was recorded in 29% (n=43/150). In the group of longer transport, prophylactic surfactant was less frequently used with a higher incidence of grades III/IV intracranial hemorrhage. In order to prevent the development of intracranial hemorrhage in premature newborns, the most important measures are the antenatal use of steroids and postnatal prophylactic use of surfactant.

Regionalization and mortality in neonatal intensive care

This article examines the outcome data for very low birth weight infants in low-volume, mid-volume, and high-volume neonatal ICUs (NICUs) and argues for regionalization of NICU services on the basis of both medical outcomes and economic rationality. It recognizes some of the obstacles to regionalization of these services and presents ways to surmount them.

Impact of maternity unit closures on access to obstetrical care: the French experience between 1998 and 2003

As in many other countries, the number of maternity units has diminished substantially in France, raising concerns about the reduced accessibility of obstetric services. We describe here the impact of closures on distance and mean travel time between pregnant women's homes and maternity units. We used data from the 1998 and 2003 French National Perinatal Surveys and from vital registries to measure indicators of accessibility: straight-line distance to the nearest maternity unit, number of units within a 15-km radius and reported travel time to the unit for delivery. We analyzed these measures for all births, births in rural versus urban areas and according to regional rates of maternity closures. From 1998 to 2003, 20% of maternity units closed (reducing the number from 759 to 621) with regional variations in the rate of closure from 0.0% to 36.0%. Mean distance to the nearest maternity unit increased (6.6-7.2 km, p < 0.001). The proportion of women living more than 30 km from a maternity ward was low; but rose from 1.4% to 1.8%. The number of maternity units with a 15-km radius of the place of residence fell (median, 3 to 2). Differences were more marked in rural areas and in regions highly affected by closures. However, reported travel time did not increase and even declined slightly for women from urban areas and in regions moderately affected by the closures. As such, the closures do not appear to have had a negative impact on the geographic accessibility of maternity units. Pregnant women were faced with a reduction in the number of maternity units near their homes and our results suggest that they more often chose their maternity units based on proximity. A full assessment of the impact of closures on accessibility to obstetric services would require information on how these changes affected available choices for care during pregnancy and delivery.

Obstetrical volume and early neonatal mortality in preterm infants

OBJECTIVE

Regionalised perinatal care with antenatal transfer of high risk pregnancies to Level III centres is beneficial. However, levels of care are usually not linked to caseload requirements, which remain a point for discussion. We aimed to investigate the impact of annual delivery volume on early neonatal mortality among very preterm births.

METHODS

All neonates with gestational age 24-30 weeks, born 1991-1999 in Lower Saxony were included into this population-based cohort study (n = 5,083). Large units were defined as caring for more than 1,000 deliveries/year, large NICUs as those with at least 36 annual very low birthweight (<1,500 g, VLBW) admissions. Main outcome criterion was mortality until day 7. Adjusted Odds Ratios (adj. OR) and 95% confidence intervals (CI) were calculated based on generalised estimating equation models, accounting for correlation of individuals within units.

RESULTS

Within the first week of life, 20.6% of all neonates deceased; 10.2% were stillbirths, 3.7% died in the delivery unit, and 6.7% in the NICU. The crude OR for early neonatal mortality after having been delivered in a small delivery unit (excluding stillbirths) was 1.36 (95%CI 1.04-1.78; adj. OR 1.16 (0.82-1.63)). It increased to 1.96 (1.54-2.48; adj. OR 1.21 (0.86-1.70)) after the inclusion of stillbirths.

CONCLUSION

This study has shown a slight, but non-significant association between obstetrical volume and early neonatal mortality. In future studies the impact of caseload on outcome may become more evident when referring to high-risk patients instead of to the overall number of deliveries.

ANGELS and University of Arkansas for Medical Sciences paradigm for distant obstetrical care delivery

OBJECTIVE

This article describes the process by which the Arkansas Medicaid Program, the University of Arkansas for Medical Sciences (the state's only academic health center), and Arkansas' practicing physicians are collaborating to improve the process of perinatal regionalization by providing access to expertise, education, and support of maternal-fetal medicine specialists. The described ANGELS model encourages replication among other programs that wish to improve perinatal regionalization attempts in their service areas.

STUDY DESIGN

Through this unique collaboration, ANGELS is composed of 5 distinctive elements: a statewide telemedicine and clinic network, an education and support program for obstetric providers, case management services, a 24-hour Call Center, and an evidence-based guidelines development and distribution network.

RESULTS

Since Arkansas has undertaken perinatal regionalization, technology has allowed the state's only group of board-certified maternal-fetal medicine specialists, located centrally in Little Rock, to provide real-time clinical support to physicians, as well as consultation or direct care to patients statewide.

CONCLUSION

ANGELS' continued efforts have the potential to significantly improve perinatal care in rural areas throughout the state, while the cost of maternal and fetal health care could decline. The program's design, although unique, can be replicated elsewhere to encourage perinatal regionalization.

Level and volume of neonatal intensive care and mortality in very-low-birth-weight infants

BACKGROUND

There has been a large increase in both the number of neonatal intensive care units (NICUs) in community hospitals and the complexity of the cases treated in these units. We examined differences in neonatal mortality among infants with very low birth weight (below 1500 g) among NICUs with various levels of care and different volumes of very-low-birth-weight infants.

METHODS

We linked birth certificates, hospital discharge abstracts (including interhospital transfers), and fetal and infant death certificates to assess neonatal mortality rates among 48,237 very-low-birth-weight infants who were born in California hospitals between 1991 and 2000.

RESULTS

Mortality rates among very-low-birth-weight infants varied according to both the volume of patients and the level of care at the delivery hospital. The effect of volume also varied according to the level of care. As compared with a high level of care and a high volume of very-low-birth-weight infants (more than 100 per year), lower levels of care and lower volumes (except for those of two small groups of hospitals) were associated with significantly higher odds ratios for death, ranging from 1.19 (95% confidence interval [CI], 1.04 to 1.37) to 2.72 (95% CI, 2.37 to 3.12). Less than one quarter of very-low-birth-weight deliveries occurred in facilities with NICUs that offered a high level of care and had a high volume, but 92% of very-low-birth-weight deliveries occurred in urban areas with more than 100 such deliveries.

CONCLUSIONS

Mortality among very-low-birth-weight infants was lowest for deliveries that occurred in hospitals with NICUs that had both a high level of care and a high volume of such patients. Our results suggest that increased use of such facilities might reduce mortality among very-low-birth-weight infants.

Effect of opening midlevel neonatal intensive care units on the location of low birth weight births in California

OBJECTIVE

Despite evidence and recommendations encouraging the delivery of high-risk newborns in hospitals with subspecialty or high-level NICUs, increasing numbers are being delivered in other facilities. Causes for this are unknown. We sought to explore the impact of diffusion of specialty or midlevel NICUs on the types of hospitals in which low birth weight newborns are born.

DESIGN

We used birth certificate, death certificate, and hospital discharge data for essentially all low birth weight, singleton California newborns born between 1993 and 2000. We identified areas likely to have been affected by the opening of a new nearby midlevel unit, analyzed changes over time in the share of births that took place in midlevel NICU hospitals, and compared patterns in areas that were and were not likely affected by the opening of a new midlevel unit. We also tracked the corresponding changes in the share of births in high-level hospitals and in those without NICU facilities (low-level).

RESULTS

The probability of a 500- to 1499-g infant being born in a midlevel unit increased by 17 percentage points after the opening of a new nearby unit. More than three quarters of this increase was accounted for by reductions in the probability of birth in a hospital with a high-level unit (-15 points), and the other portion was resulting from reductions in the share of newborns delivered in hospitals with low-level centers (-2 points). Similar patterns were observed in 1500- to 2499-g newborns.

CONCLUSIONS

The introduction of new midlevel units was associated with significant shifts of births from both high-level and low-level hospitals to midlevel hospitals. In areas in which new midlevel units opened, the majority of the increase in midlevel deliveries was attributable to shifts from high-level unit births. Continued proliferation of midlevel units should be carefully assessed.

Cesarean section in term breech presentations: do rates of adverse neonatal outcomes differ by hospital birth volume?

AIM

To determine if risk of adverse neonatal outcomes among term breech infants delivered by cesarean section differs by volume of such births at the delivering hospital.

METHODS

We conducted a population-based cohort study using Missouri linked birth and death certificate files. The study population included 10,106 singleton, term, normal birth weight infants in breech presentation delivered by cesarean section. Infants were linked to hospitals where delivered. These hospitals were divided into terciles (low, medium, and high volume) based on the median number of annual deliveries during 1993-1999. The primary outcome was presentation of at least one adverse neonatal outcome. Adjusted odds ratios and 95% confidence intervals (CI) were calculated using logistic regression analysis.

RESULTS

The rate of any adverse outcome was 17.8, 15.0, and 5.9 cases per 1,000 deliveries at low-, medium-, and high-volume hospitals, respectively. All component adverse outcomes occurred more frequently in low- or medium-volume hospitals than in high-volume hospitals. Compared to breech infants delivered at high-volume hospitals, those delivered at low-volume and medium-volume hospitals were 2.7 (CI 1.6, 4.5) and 2.4 (CI 1.4, 4.1) times, respectively, more likely to experience an adverse outcome after adjusting for significant confounders.

CONCLUSIONS

Prospective studies should explore the source of these risk differences.

A primer on antenatal testing for neonatal nurses: part 1. Tests used to predict preterm labor

Parents and healthcare providers are challenged to understand the mechanisms of, and predictors for preterm delivery. In addition to the epidemiologic implications, on a practical level, the ability to predict preterm delivery may help the neonatal team triage to assure bed availability, and to predict and provide appropriate staffing for new admissions. On an individual patient level, understanding the maternal history, including antenatal risk factors and relevant monitoring and testing, is an important foundation for subsequent neonatal care. A number of new diagnostic testing tools are being used in obstetric practice to enhance the ability to predict preterm delivery. The results of fetal fibronectin and ultrasound measurement of cervical length are increasingly used to triage obstetrical patients. Results of these tests may prompt transfer to a tertiary facility. Part 1 of this 2-part series will describe antenatal testing techniques used to predict preterm delivery (PTD), as well as highlight the emerging developments in maternal serum testing. Further, a recent treatment option for preterm labor, 17 alpha-hydroxyprogesterone caproate, will also be discussed.

Does size matter? A population-based study of birth in lower volume maternity hospitals for low risk women

OBJECTIVE

To study the association between volume of hospital births per annum and birth outcome for low risk women.

DESIGN

Population-based study using the National Perinatal Data Collection (NPDC).

SETTING

Australia.

PARTICIPANTS

Of 750,491 women who gave birth during 1999-2001, there were 331,147 (47.14%) medically 'low risk' including 132,696 (40.07%) primiparae and 198,451 (59.93%) multiparae.

METHODS

The frequency of each birth and infant outcome was described according to the size of the hospital where birth took place. We investigated whether unit size (defined by volume) was an independent risk factor for each outcome factor using public hospitals with greater than 2000 births per annum as a reference point.

MAIN OUTCOME MEASURES

Rates of intervention at birth and neonatal mortality for low risk women in relation to hospitals with <100, 100-500, 501-1000, 1001-2000 and >2001 births per annum.

RESULTS

Neonatal death was less likely in hospitals with less than 2000 births per annum regardless of parity. For multiparous low risk women in hospitals of 100 and 500 births per annum compared with hospitals of >2000 births per annum the adjusted odds of neonatal mortality [adjusted odds ratio (AOR) 0.36; 99% confidence interval (CI) 0.14-0.93]. For low risk primiparous women in hospitals with less than 100 births per annum, there were lower rates of induction of labour (AOR 0.62; 99% CI 0.54-0.73); intrathecal analgesia/anaesthesia (AOR 0.34; 99% CI 0.28-0.42); instrumental birth (AOR 0.80; 99% CI 0.69-0.93); caesarean section after labour (AOR 0.59; 99% CI 0.49-0.72) and admission to a neonatal unit (AOR 0.15; 99% CI 0.10-0.22) and for low risk multiparous women in hospitals with less than 100 births per annum: induction (AOR 0.69; 99% CI 0.62-0.76); intrathecal analgesia/anaesthesia (AOR 0.32; 99% CI 0.29-0.36); instrumental birth (AOR 0.52; 99% CI 0.41-0.67); caesarean section after labour (AOR 0.41; 99% CI 0.33-0.52); and admission to a neonatal unit (AOR 0.09; 99% CI 0.07-0.12).

CONCLUSIONS

In Australia, lower hospital volume is not associated with adverse outcomes for low risk women.

The influence of hospital closures in Nova Scotia on perinatal outcomes

OBJECTIVE

To evaluate the effect of hospital closures on critical obstetrical interventions and perinatal outcomes in rural communities in Nova Scotia, Canada.

METHODS

A population-based cohort study was carried out for the years 1988 to 2002, using data extracted from the Nova Scotia Atlee Perinatal Database. Regions of maternal residence were defined geographically and administratively as Eastern, Northern,Western, and Central. The time periods of 1988 to 1993 and 1996 to 2002 were chosen based on the timing of hospital closures. Changes in rates of several perinatal outcomes were examined by region in relation to the extent of hospital closures experienced by that region.

RESULTS

The majority of hospital closures occurred in 1994 to 1995 with the establishment of new health regions, and affected the Western region most profoundly. In comparison with the Central region (relative risk [RR], 0.56; 95% confidence interval [CI], 0.53-0.59), the temporal reduction in the rate of forceps-assisted vaginal delivery was smaller in the Western region (RR, 0.83; 95% CI, 0.76-0.91; P < .001), but greater in the Northern (RR, 0.36; 95% CI, 0.32-0.41; P < .001) and Eastern (RR, 0.26; 95% CI, 0.23-0.30; P < .001) regions. The temporal increase in the rate of breastfeeding at discharge from hospital was smaller in the Northern region (RR, 1.36; 95% CI, 1.29-1.45; P < .001) compared to that in the Central region (RR, 1.55; 95% CI, 1.49-1.61). The decrease in the rate of fetal growth restriction was smaller in the Western (RR, 0.95; 95% CI, 0.87-1.02; P = .002) and Eastern (RR, 0.90; 95% CI, 0.82-0.98; P = .002) regions of residence compared to the Central region (RR, 0.75; 95% CI, 0.71-0.79). There were no significant regional differences in temporal patterns of preterm induction and/or preterm Caesarean delivery, or perinatal mortality.

CONCLUSION

Although trends over time demonstrated some regional differences in obstetrical interventions and perinatal outcomes, our retrospective evaluation did not reveal a consistent relationship between reductions in maternity services associated with hospital closures and systematic, population-level adverse perinatal consequences in Nova Scotia.

Hospital factors and nontransfer of small babies: a marker of deregionalized perinatal care?

OBJECTIVES

Our purpose was to examine the contribution of hospital factors (e.g., reimbursement sources, teaching status) to the rate of nontransfer of <1250 g infants born in nontertiary hospitals in Illinois. We chose nontransfer as a marker of the extent to which there have been structural changes in the regionalized perinatal care system in Illinois.

STUDY DESIGN

Using data from live birth certificates (1989-1996), from the American Hospital Association's Annual Survey of Hospitals (1990 to 1996), and Illinois hospital discharge records (1992 to 1996), we simultaneously assessed the effect of hospital and individual factors on nontransfer of infants <1250 g (n=2904).

RESULTS

When adjusted for individual risk factors, several hospital factors were associated with nontransfer. These include birth in a Level II+hospital (odds ratios(OR) 3.75; 95% CI 2.29, 5.29), high Medicaid revenues (OR 1.97; 95% CI 1.58, 2.47), high HMO revenues (OR 1.39; 95% CI 1.11, 2.28), and status as a teaching hospital (OR 1.63; 95% CI 1.30, 2.09).

CONCLUSIONS

This study suggests that there should be careful consideration of the role of hospital factors in perinatal deregionalization in order to preserve the improvements in maternal and infant outcomes associated with regionalized perinatal care.

The effect of birth hospital type on the outcome of very low birth weight infants

OBJECTIVE

To test the hypothesis that the likelihood of death or major morbidity is reduced for very low birth weight (VLBW; <1500 g) infants who are born at hospitals with subspecialty perinatal and neonatal care compared with other available birth sites.

METHODS

A population-based cohort study was conducted of all live births of 500 to 1499 g at the 19 hospitals in the greater Cincinnati region from September 1, 1995, through December 31, 1997 (N = 848). Primary outcome was the risk-adjusted, predischarge mortality or morbidity, including bronchopulmonary dysplasia, severe intracranial hemorrhage, severe retinopathy of prematurity, or necrotizing enterocolitis for VLBW infants who were born at subspecialty perinatal centers compared with those who were born at nonsubspecialty centers.

RESULTS

The odds of death or major morbidity for VLBW infants who are born at nonsubspecialty perinatal centers is twice that of infants who are born at subspecialty centers despite controlling for demographic (odds ratio [OR]: 2.64; 95% confidence interval [CI]: 1.7-4.2) and practice characteristics (OR: 1.96; 95% CI: 1.2-3.2). The effect of birth hospital type on death or major morbidity was greater for infants of 1000 to 1499 g birth weight (OR: 3.42; 95% CI: 2.0-6.1) than for infants of 500 to 999 g birth weight (OR: 2.1; 95% CI: 1.0-4.8).

CONCLUSION

The current study lends strong support to existing Academy of Pediatrics and American College of Obstetricians and Gynecologists recommendations that deliveries at <32 weeks' gestational age occur at subspecialty perinatal centers.

Local health department perspectives on linkages among birthing hospitals

OBJECTIVES

To describe perinatal linkages among hospitals, changes in their numbers and their impact on relationships among high-risk providers in local communities.

STUDY DESIGN

Data were obtained about the organization of perinatal services in 1996-1999 from a cross-sectional study evaluating fetal and infant mortality review (FIMR) programs nationwide. Geographic areas were sampled based on region, population density, and the presence of a FIMR. A local health department representative was interviewed in 76% (N=193) of eligible communities; 188 provided data about hospitals.

RESULTS

Linkages among all hospitals were reported in 143 communities and with a subspecialty hospital in 122. All but 12 communities had a maternity hospital, and changes in the number of hospitals occurred in 49 communities. Decreases in the number of Level II hospitals were related to changes in relationships among providers of high-risk care for mothers and newborns; they were associated with changing relationships only for mothers in Level I hospitals. These relations were noted only where established provider relationships existed.

CONCLUSIONS

Decreases in the number of maternity hospitals affect provider relationships in communities, but only where there are established linkages among hospitals.

Expansion of community-based perinatal care in California

OBJECTIVE

In California, hospitals with Community Neonatal Intensive Care Units (NICUs) increased from 17 in 1990 to 52 in 1997. The purpose of this study was to investigate the effects of their growth on level-specific distribution of births, acuity, and neonatal mortality.

STUDY DESIGN

A total of 4,563,900 infants born from 1990 to 1997 were analyzed by levels of care. We examined shifts in birth location and acuity. Neonatal mortality for singleton very-low-birth-weight (VLBW) infants without congenital abnormalities was used to assess differences in level-specific survival.

RESULTS

Live births at hospitals with Community NICUs increased from 8.6% to 28.6%, and VLBW births increased from 11.7% to 37.4%. Births and VLBW births at Regional NICUs decreased, whereas acuity was unchanged. There were no differences in neonatal mortality of VLBW infants born at Community or Regional NICU hospitals. Mortality for VLBW births at other levels of care was significantly higher.

CONCLUSION

The rapid growth of monitored Community NICUs supported by a regionalized system of neonatal transport represents an evolving face of regionalization. Survival of VLBW births was similar at Community and Regional hospitals and higher than in other birth settings. Reducing VLBW births at Primary Care and Intermediate NICU hospitals continues to be an important goal of regionalization. doi:10.1038/sj.jp.7210824

Location, location, location: regionalization and outcome in pediatric critical care

This article briefly reviews some of the background, recent studies, and unanswered questions related to regionalization of critical care services for children. Evidence and arguments in support of centralized services for critically ill children are increasing. Early studies suggested that organized systems of care improve outcomes. More recently, investigators have examined tertiary pediatric critical care and specific components of tertiary care. More recent studies have provided additional evidence supporting regionalization and documenting its effects. Unfortunately, a growing body of evidence suggests that many hospitalized critically ill children with fatal outcomes in the United States never received the highest level of care available.

Low-volume obstetrics. Characteristics of family physicians' practices in Alberta

OBJECTIVE

To compare the obstetric practices of family physicians who attended fewer than 25 births per year (low-volume) with the practices of family physicians who attended more than 25 births per year (high-volume) and the practices of obstetricians.

DESIGN

Retrospective cohort study using data from administrative databases.

SETTING

Alberta.

PARTICIPANTS

All physicians who provided intrapartum care between April 1, 1997, and March 31, 2000.

MAIN OUTCOME MEASURES

Type of delivery, size of hospitals where deliveries took place, characteristics of patients, and number of medical interventions.

RESULTS

Of 1026 family physicians, 543 (53%) were low-volume providers of intrapartum care. In 1997-1998, low-volume family physicians (LVFPs) attended 24% of all vaginal and cesarean births attended by family physicians; by 1998-1999, that percentage had decreased to 9%; and by 1999-2000, to 5%. In contrast, the number of births attended by all family physicians remained relatively constant at 43% during the 3 years. In hospitals that had fewer than 50 deliveries a year, LVFPs attended almost half the births. Although LVFPs did fewer medical inductions, vacuum extractions, and epidural anesthetics and more forceps extractions, episiotomies, and cesarean sections than high-volume family physicians (HVFPs), the differences between their practices were much smaller than the differences between all family physicians' practices and the practices of obstetricians (who treat higher-risk mothers and newborns).

CONCLUSION

The decrease in LVFPs' obstetric practices could make a pronounced difference at smaller hospitals where most low-volume practice occurs.

Deregionalization of neonatal intensive care in urban areas

OBJECTIVES

This report describes the extent of deregionalization of neonatal intensive care in urban areas of the United States in the 1980s and 1990s and the factors associated with it.

METHODS

We conducted a 15-year retrospective analysis of secondary data from US metropolitan statistical areas. Primary outcome measures are number of neonatal intensive care unit (NICU) beds, number of NICU hospitals, and number of small NICUs.

RESULTS

Growth in the supply of NICU care has outpaced the need. During the study period (1980-1995), the number of hospitals grew by 99%, the number of NICU beds by 138%, and the number of neonatologists by 268%. In contrast, the growth in needed bed days was only 84%. Of greater concern, the number of beds in small NICU facilities continues to grow. Local regulatory and practice characteristics are important in explaining this growth.

CONCLUSIONS

Local policymakers should examine the factors that facilitate the proliferation of services, especially the development of small NICUs. Policies that encourage cooperative efforts by hospitals should be developed. Eliminating small NICUs would not restrict the NICU bed supply in most metropolitan statistical areas.

Neonatal mortality rates in communities with small maternity units compared with those having larger maternity units

OBJECTIVE

To compare neonatal mortality in geographical areas where most deliveries occur in large hospitals with areas where a larger proportion of deliveries occur in small maternity units.

DESIGN

Population-based study using data from The Norwegian Medical Birth Registry.

SETTING

Records on all deliveries in Norway from 1967 to 1996, a total of 1.7 million births, were equipped with data on the size of the maternity units used by delivering women in that particular area.

MAIN OUTCOME MEASURE

Risk of neonatal death.

RESULTS

Women living in areas where the most frequently used delivery unit had less than 2000 annual deliveries had 1.2 fold the risk of experiencing neonatal death of their newborn (95% CI 1.1-1.3). The relative risk of neonatal death in geographical areas where more than 75% of deliveries occurred in units with more than 3000 annual births was 0.8 (95% CI 0.7-0.9) compared with areas where none delivered in such large units. The relative risk of neonatal death in areas where the most frequently used delivery units had less than 100 annual births was 1.4 (95% CI 1.1-1.7) compared with areas where units of more than 3000 annual births were the most frequently used. Differences in outcome could not be explained by differences in travelling distance to an urban centre where most referral delivery units are located, differences between rural and urban municipalities, or by differences in biological or socio-economic risk factors between municipalities.

CONCLUSIONS

We observed a small but significantly decreased neonatal mortality in areas where the great majority of births occurred in large hospitals.

Maternal complications of normal deliveries: variation among rural hospitals

This study examined variation in maternal complication rates following normal vaginal delivery among 282 rural hospitals throughout the United States. Using a risk-adjusted model to control for case mix, discharge abstracts of more than 84,000 women were analyzed to determine whether there were differences in outcomes resulting from, or concomitant with, their hospital stay. After risk adjustment, the majority of hospitals were found to be performing at an acceptable level; however, there were some factors associated with poor performance. Hospital volume and the availability of obstetricians in the county in which the hospital was located were found to have an inverse association with complication rates, whereas low county per capita income was found to have a positive association with poor facility performance. No association was found between complication rates and general practitioners and the degree of remoteness as defined by distance from the nearest tertiary care facility. The results demonstrate a relationship between volume and outcome and a threshold point at which volume becomes a significant factor in predicting facility performance. As well, a relationship is seen between physician specialty and outcome, in which obstetricians are significantly associated with facility performance at expected or better-than-expected levels. Normal vaginal delivery is an important service provided by rural hospitals. The relationships among volume, physician specialty and outcome suggested by these findings require further in-depth examination of specific factors that affect patient outcomes and overall facility performance.

Volume-outcome relationships in pediatric intensive care units

CONTEXT

Pediatric intensive care units (PICUs) have expanded nationally, yet few studies have examined the potential impact of regionalization and no study has demonstrated whether a relationship between patient volume and outcome exists in these units. Documentation of an inverse relationship between volume and outcome has important implications for regionalization of care.

OBJECTIVES

This study examines relationships between the volume of patients and other unit characteristics on patient outcomes in PICUs. Specifically, we investigate whether an increase in patient volume improves mortality risk and reduces length of stay.

DESIGN AND SETTING

A prospective multicenter cohort design was used with 16 PICUs. All of the units participated in the Pediatric Critical Care Study Group. Participants. Data were collected on 11 106 consecutive admissions to the 16 units over a 12-month period beginning in January 1993.

MAIN OUTCOME MEASURES

Risk-adjusted mortality and length of stay were examined in multivariate analyses. The multivariate models used the Pediatric Risk of Mortality score and other clinical measures as independent variables to risk-adjust for illness severity and case-mix differences.

RESULTS

The average patient volume across the 16 PICUs was 863 with a standard deviation of 341. We found significant effects of patient volume on both risk-adjusted mortality and patient length of stay. A 100-patient increase in PICU volume decreased risk-adjusted mortality (adjusted odds ratio:.95; 95% confidence interval:.91-.99), and reduced length of stay (incident rate ratio:.98; 95% confidence interval:.975-.985). Other PICU characteristics, such as fellowship training program, university hospital affiliation, number of PICU beds, and children's hospital affiliation, had no effect on risk-adjusted mortality or patient length of stay.

CONCLUSIONS

The volume of patients in PICUs is inversely related to risk-adjusted mortality and patient length of stay. A further understanding of this relationship is needed to develop effective regionalization and referral policies for critically ill children.

Use of high-technology care among women with high-risk pregnancies in the United States

OBJECTIVE

Infant mortality has been reduced dramatically with the development of perinatal regionalized high-technology care. Our objective was to assess use of high technology care among women with high-risk pregnancies in the urban and rural United States.

METHODS

The 1988 National Maternal and Infant Health Survey was linked to the 1988 American Hospital Association survey of all obstetrical hospitals. Hospitals were classified into five levels of care based on services and staffing. Women were classified as having high-risk pregnancies using two definitions: (1) gestational age < 34 weeks and birthweight < 1500 g (High Risk I) and (2) the first definition or an antenatal high-risk medical diagnoses (High Risk II). Analyses assessed the proportion of high-risk women delivering in appropriate locations in the rural and urban United States and explored how personal characteristics, insurance status, and use and source of prenatal care influenced where high-risk women delivered.

RESULTS

71.2% of High Risk I and 55.9% of High Risk II women delivered in a high-technology facility (Level IIA or III). Fifty percent of HRI rural women delivered in tertiary high-technology hospitals and 39% of HRII rural women delivered in a high-technology hospital. High-risk urban women were two to three times more likely to deliver in a high-technology facility compared to their rural counterparts. The multivariate analysis showed that Black high-risk women were more likely to deliver in a high-technology setting and that receipt of prenatal care in a private setting lowered the odds of delivering in a high-technology setting when other factors were controlled.

CONCLUSIONS

In an era where regionalized perinatal care was not threatened by managed care, a large proportion of high-risk women received care in less than optimal settings. Rural high-risk women delivered in high-technology hospitals less often than their urban counterparts. The multivariate analyses implied that the potential barriers to care may be more important among those considered more socially advantaged, who may be more at the mercy of managed care. The current reimbursement environment, which discourages referral to specialists and high-technology care, could result in less access today.

Relation between size of delivery unit and neonatal death in low risk deliveries: population based study

AIM

To examine risk of neonatal death after low risk pregnancies in relation to size of delivery units.

METHODS

A population based study of live born singleton infants in Norway with birthweights of at least 2500 g was carried out. Antenatal risk factors were adjusted for.

RESULTS

From 1972 to 1995, 1.25 million births fulfilled the criteria. The neonatal death rate was lowest for maternity units with 2001-3000 annual births and steadily increased with decreasing size of the maternity unit to around twice that for units with less than 100 births a year (odds ratio 2.1; 95 % confidence interval 1.6 to 2.8). Institutions with more than 3000 deliveries a year also had a higher rate (odds ratio 1.7; 95% CI 1.4 to 2.0), but analyses suggest that this rate is overestimated.

CONCLUSION

Around 2000 to 3000 annual births are needed to reduce the risk of neonatal deaths after low risk deliveries.