Faculty Bibliography

OBJECTIVE:Older adults are a potentially medically vulnerable population with increased mortality rates during and after disasters. To evaluate the impact of a natural disaster on this population, we performed a temporal and geospatial analysis of emergency department (ED) use by adults aged 65 years and older in New York City (NYC) following Hurricane Sandy's landfall. METHODS:We used an all-payer claims database to analyze demographics, insurance status, geographic distribution, and health conditions for post-disaster ED visits among older adults. We compared ED patterns of use in the weeks before and after Hurricane Sandy throughout NYC and the most afflicted evacuation zones. RESULTS:We found significant increases in ED utilization by older adults (and disproportionately higher in those aged ≥85 years) in the 3 weeks after Hurricane Sandy, especially in NYC evacuation zone one. Primary diagnoses with notable increases included dialysis, electrolyte disorders, and prescription refills. Secondary diagnoses highlighted homelessness and care access issues. CONCLUSIONS:Older adults display heightened risk for worse health outcomes with increased ED visits after a disaster. Our findings suggest the need for dedicated resources and planning for older adults following a natural disaster by ensuring access to medical facilities, prescriptions, dialysis, and safe housing and by optimizing health care delivery needs to reduce the burden of chronic disease. (Disaster Med Public Health Preparedness. 2018;12:184-193).

BACKGROUND:Interest in social determinants of health (SDOH) has expanded in recent years, driven by a recognition that such factors may influence health outcomes, services use, and health care costs. One subset of SDOH is material needs such as housing and food. We conducted a systematic review of the literature on material needs among emergency department (ED) patients in the United States. METHODS:We followed PRISMA guidelines for systematic review methodology. With the assistance of a research librarian, four databases were searched for studies examining material needs among ED patients. Two reviewers independently screened titles, abstracts, and full text to identify eligible articles. Information was abstracted systematically from eligible articles. RESULTS:Forty-three articles were eligible for inclusion. There was heterogeneity in study methods; single center, cross-sectional studies were most common. Specific material needs examined included homelessness, poverty, housing insecurity, housing quality, food insecurity, unemployment, difficulty paying for health care, and difficulty affording basic expenses. Studies overwhelmingly supported the notion that ED patients have a high prevalence of a number of material needs. CONCLUSIONS:Despite some limitations in the individual studies examined in this review, the plurality of prior research confirms that the ED serves a vulnerable population with high rates of material needs. Future research is needed to better understand the role these needs play for ED patients and how to best address them.

Latinos are the largest immigrant group in the United States, representing 17.6% of the total U.S. population, and are therefore critical to include in research. However, Latino immigrants-and particularly those who are undocumented residents-may be increasingly wary of participating in research amidst hostile anti-immigrant rhetoric and high profile cases of deportation. In this commentary we discuss challenges of conducting research with undocumented Latino immigrants in the current sociopolitical climate. We provide suggestions for data collection, data protection, and research recruitment techniques that may mitigate some of these challenges.

Emergency departments (EDs) are often called the "˜safety net"™ of the U.S. health care system. Little is known, however, about the social determinants of health (SDOH)"“including rates and types of homelessness"“of ED patients. This study sought to quantify the presence of housing instability, homelessness, and other selected SDOH in ED patients. We conducted a cross-sectional survey of a random sample of 625 patients presenting to an urban ED. 13.8% of patients were currently living in a homeless shelter or on the streets. Further, 25.4% of patients reported concern about becoming homeless in the next 2 months and 9.1% had been evicted in the past year. 42.0% of patients reported difficulty meeting essential expenses and 35.9% were worried about running out of food. In conclusion, we found high rates of homelessness and other social needs in ED patients. Addressing patients"™ SDOH will become increasingly important under new healthcare payment models.

OBJECTIVE: We aimed to characterize the geographic distribution of post-Hurricane Sandy emergency department use in administrative flood evacuation zones of New York City. METHODS: Using emergency claims data, we identified significant deviations in emergency department use after Hurricane Sandy. Using time-series analysis, we analyzed the frequency of visits for specific conditions and comorbidities to identify medically vulnerable populations who developed acute postdisaster medical needs. RESULTS: We found statistically significant decreases in overall post-Sandy emergency department use in New York City but increased utilization in the most vulnerable evacuation zone. In addition to dialysis- and ventilator-dependent patients, we identified that patients who were elderly or homeless or who had diabetes, dementia, cardiac conditions, limitations in mobility, or drug dependence were more likely to visit emergency departments after Hurricane Sandy. Furthermore, patients were more likely to develop drug-resistant infections, require isolation, and present for hypothermia, environmental exposures, or administrative reasons. CONCLUSIONS: Our study identified high-risk populations who developed acute medical and social needs in specific geographic areas after Hurricane Sandy. Our findings can inform coherent and targeted responses to disasters. Early identification of medically vulnerable populations can help to map "hot spots" requiring additional medical and social attention and prioritize resources for areas most impacted by disasters. (Disaster Med Public Health Preparedness. 2016;page 1 of 11).

BACKGROUND: Geographic variation in healthcare has been traditionally studied in large areas such as hospital referral regions or service areas. These analyses are limited by variation that exists within local communities. MATERIALS AND METHODS: Using a New York claims database, we analyzed variation in emergency department use using 35 million visits from 2008 to 2012 among 4797 Census tracts, a smaller unit than usually studied. Using multivariate analysis, we studied associations between population characteristics and proximity to healthcare with rates of emergency department use. We analyzed how factors associated with emergency department utilization differed among urban, suburban, and rural regions. RESULTS: We found significant geographic variation in emergency department use among Census tracts. Public insurance and uninsurance were correlated with high emergency department utilization across all types of regions. We found that race, ethnicity, and poverty were only associated with high emergency department use in urban regions. In suburban and rural regions, a lower proportion of elderly residents and shorter distances to the nearest ED were correlated with high emergency department use. CONCLUSIONS: Significant variation in emergency department use exists locally when studied within small geographic areas. Insurance type is significantly associated with variation in emergency department use across urban, suburban, and rural regions, whereas the significance of other factors depended on urbanicity. IMPLICATIONS: Studying geographic variation at a more granular level can lead to better understanding of local population health, drivers of healthcare utilization, and inform targeted interventions. Given heterogeneity in emergency department use by Census tract, policies directed at shaping acute care utilization must consider these local geographic differences.

Hurricane Sandy struck New York City on October 29, 2012, causing not only a large amount of physical damage, but also straining people's health and disrupting health care services throughout the city. In prior research, we determined that emergency department (ED) visits from the most vulnerable hurricane evacuation flood zones in New York City increased after Hurricane Sandy for several medical diagnoses, but also for the diagnosis of homelessness. In the current study, we aimed to further explore this increase in ED visits for homelessness after Hurricane Sandy's landfall. We performed an observational before-and-after study using an all-payer claims database of ED visits in New York City to compare the demographic characteristics, insurance status, geographic distribution, and health conditions of ED patients with a primary or secondary ICD-9 diagnosis of homelessness or inadequate housing in the first week after Hurricane Sandy's landfall versus the baseline weekly average in 2012 prior to Hurricane Sandy. We found statistically significant increases in ED visits for diagnosis codes of homelessness or inadequate housing in the week after Hurricane Sandy's landfall. Those accessing the ED for homelessness or inadequate housing were more often elderly and insured by Medicare after versus before the hurricane. Secondary diagnoses among those with a primary ED diagnosis of homelessness or inadequate housing also differed after versus before Hurricane Sandy. These observed differences in the demographic, insurance, and co-existing diagnosis profiles of those with an ED diagnosis of homelessness or inadequate housing before and after Hurricane Sandy suggest that a new population cohort-potentially including those who had lost their homes as a result of storm damage-was accessing the ED for homelessness or other housing issues after the hurricane. Emergency departments may serve important public health and disaster response roles after a hurricane, particularly for people who are homeless or lack adequate housing. Further, tracking ED visits for homelessness may represent a novel surveillance mechanism to assess post-disaster infrastructure impact and to prepare for future disasters.

BACKGROUND: The Affordable Care Act has added millions of new Medicaid enrollees to the health care system. These patients account for a large proportion of emergency department (ED) utilization. OBJECTIVE: Our aim was to characterize this population and their ED use at a national level. METHODS: We used the 2010 National Hospital Ambulatory Medical Care Survey (NHAMCS) to describe demographics and clinical characteristics of nonelderly adults (>/=18 years old and /=4 ED visits/year and business hours as 8 am to 5 pm. We used descriptive statistics to describe the epidemiology of Medicaid-covered ED visits. RESULTS: NHAMCS included 21,800 ED visits by nonelderly adults in 2010, of which 5,659 (24.09%) were covered by Medicaid insurance. Most ED visits covered by Medicaid were made by patients who are young (25 and 44 years old) and female (67.95%; 95% confidence interval [CI] 66.00-69.89). A large proportion of the ED visits covered by Medicaid were revisits within 72 h (14.66%; 95% CI 9.13-20.19) and from frequent ED users (32.32%; 95% CI 24.29-40.35). Almost half of all ED visits covered by Medicaid occurred during business hours (45.44%; 95% CI 43.45-47.43). CONCLUSIONS: The vast majority of Medicaid enrollees who used the ED were young females, with a large proportion of visits occurring during business hours. Almost one-third of all visits were from frequent ED users.