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The article of record as published may be found at http://dx.doi.org/10.1377/hlthaff.2019.00125 High-occupancy hospitals may be sensitive to neighboring emergency department (ED) closures and openings, as they already operate at or near capacity. We conducted a retrospective analysis using data for the period 2001-13 to examine outcomes of and treatment received by patients with acute myocardial infarction at so-called bystander EDs that had been exposed to nearby ED closures or openings. We used changes in driving time between an ED and the next-closest one as a proxy for a closure or opening: If driving time increased, for instance, it meant that a nearby ED had closed. When a high-occupancy ED was exposed to a closure that resulted in increased driving time of thirty minutes or more to the next-closest ED, one-year mortality and thirty-day readmission rates increased by 2.39 and 2.00 percentage points, respectively, while the likelihood of receiving percutaneous coronary intervention (PCI) declined by 2.06 percentage points. Exposure to ED openings that resulted in decreased driving times of thirty minutes or more was associated with reductions in thirty-day mortality at bystander hospitals and an increased likelihood of receiving PCI. Our findings suggest that limited resources at high-occupancy bystander hospitals make them sensitive to changes in the availability of emergency care in neighboring communities. This work was supported by the National Heart, Lung, and Blood Institute of the National Institutes of Health (Grant Nos. R01HL114822 and R01HL134182 to both Renee Hsia and Yu-Chu Shen). This work was supported by the National Heart, Lung, and Blood Institute of the National Institutes of Health (Grant Nos. R01HL114822 and R01HL134182 to both Renee Hsia and Yu-Chu Shen).

The article of record as published may be found at http://dx.doi.org/10.1377/hlthaff.2017.1602 Inpatient volume has long been believed to be a contributing factor to ambulance diversion, which can lead to delayed treatment and poorer outcomes. We examined the extent to which both daily inpatient and emergency department (ED) volumes at specified hospitals, and diversion levels (that is, the number of hours ambulances were diverted on a given day) at their nearest neighboring hospitals, were associated with diversion levels in the period 2005–12. We found that a 10 percent increase in patient volume was associated with a sevenfold greater increase in diversion hours when the volume increase occurred among inpatients (5 percent) versus ED visitors (0.7 percent). When the next-closest ED experienced mild, moderate, or severe diversion, the study hospital’s diversion hours increased by 8 percent, 23 percent, and 44 percent, respectively. These findings suggest that efforts focused on managing inpatient volume and flow might reduce diversion more effectively than interventions focused only on ED dynamics. National Heart, Lung, and Blood Institute of the National Institutes of Health R01HL134182 R01HL114822

Many frequent emergency department (ED) users do not sustain high use over time, which makes it difficult to create targeted interventions to address their health needs. We performed a retrospective analysis of nonelderly adult frequent ED users in California to measure the persistence of frequent ED use in the period 2005-15, describe characteristics of persistent and nonpersistent frequent users, and identify predictors of persistent frequent use. Of the frequent ED users in 2005, 30.5 percent remained frequent users in 2006. A small but nontrivial population (16.5 percent, 5.7 percent, and 1.9 percent) exhibited persistent frequent use for three, six, and eleven consecutive years, respectively. The strongest predictor of persistent frequent ED use was the intensity of ED use in the baseline study year. The rate at which frequent users stopped using the ED frequently decreased over time, leaving a core group of chronic persistent users. These persistent frequent users differ from nonpersistent frequent users, who engaged in temporary intense use of the ED. Identifying and differentiating persistent frequent users is important, as they may be candidates for distinct interventions.

Despite increases in the use of emergency department (EDs) for mental health care, there are limited data on whether psychiatric patients disproportionately contribute to ED crowding. We conducted a retrospective analysis using a national database of ED visits in the period 2002-11 to describe trends in median and ninetieth-percentile length-of-stay for patients with psychiatric versus nonpsychiatric primary diagnoses. Psychiatric patients who visited the ED were transferred to another facility at six times the rate of nonpsychiatric patients. Median lengths-of-stay were similar for psychiatric and nonpsychiatric patients among those who were admitted to the hospital (264 versus 269 minutes) but significantly different for those who were admitted for observation (355 versus 279 minutes), transferred (312 versus 195 minutes), or discharged (189 versus 144 minutes). Overall, differences in ED length-of-stay between psychiatric and nonpsychiatric patients did not narrow over time. These findings suggest deficiencies in ED capacity for psychiatric care, which may necessitate improvements in both throughput and alternative models of care.

Between 1997 and 2011, there was a nearly 50 percent reduction in US emergency department mortality rates for adults. This trend likely has many causes, related to advances in palliative, prehospital, and emergency care.

In exchange for sizable tax exemptions, not-for-profit hospitals must engage in activities that meet the Internal Revenue Service's community benefit standard. The provision of charity care-free care to those unable to pay-can help meet that standard. Bad debt, the other form of uncompensated care, cannot be used to meet the standard, although Medicaid shortfalls can. However, the ACA lacks guidelines for providing charity care, and federal law sets no minimum requirements for community benefit activities. Using data from California, we examined whether the levels of charity and uncompensated care provided differed across general acute care hospitals by profit status and other characteristics during 2011-13. The mean proportion of total operating expenses spent on charity care differed significantly between not-for-profit (1.9 percent) and for-profit hospitals (1.4 percent), in contrast to the mean proportion spent on uncompensated care. Both types of spending varied widely across hospitals. Policy makers should consider measures that remove disincentives to meeting the persistent considerable need for charity care-for example, increasing supports to offset rising Medicaid shortfalls resulting from program expansion-and facilitate the tracking of ACA impacts on the distribution of charity care and uncompensated care delivery.

Many states have "prudent layperson" mandates that require health plans to reimburse hospitals for emergency department (ED) care delivered to patients who believe that they have symptoms warranting emergency treatment. Increased, and possibly unnecessary, ED use has often been attributed to these policies. We use data from thirty-five states to study relationships between passage of prudent layperson policies in the late 1990s and ED use among the privately insured. None of the analyses show evidence that the mandates are associated with increased use. We conclude that prudent layperson mandates are not associated with increases in ED visits among privately insured patients.