U.S. Emergency Department Visits by Persons With Dementia: Impact of Medicare Claims Data and Undiagnosed Dementia

Dementia is associated with increased risk of hospitalization and emergency department (ED) visits. Many persons with dementia are undiagnosed or unaware of their diagnosis, however. Our objective was to determine whether undiagnosed dementia or unawareness affects risk of hospitalization or ED visits. Retrospective longitudinal cohort study of 3537 community-living adults age ≥65 enrolled in the 2011-2017 National Health and Aging Trends Study with linked fee-for-service Medicare claims. Using self or proxy reported diagnosis, proxy dementia screening questionnaire, cognitive testing, and Medicare claims diagnosis, participants were classified as having (1) no dementia or dementia, for which they were classified as (2) undiagnosed, (3) diagnosed but unaware, or (4) diagnosed and aware. Proportional hazards models evaluated all-cause and potentially preventable hospitalization and ED visit risk by time-varying dementia status, adjusting for older adult characteristics. Most participants (n=2879) had no dementia at baseline. Among participants with dementia at baseline (n=658), 187 were undiagnosed, 300 diagnosed but unaware, and 171 diagnosed and aware. In multivariable adjusted proportional hazards models, persons with undiagnosed dementia had lower risk of hospitalization and ED visits compared to persons diagnosed and aware (all-cause hospitalization aHR 0.59 [0.44, 0.79] and ED visit aHR 0.63 [0.47, 0.85]) and similar risks of these outcomes compared to persons without dementia. Individuals diagnosed but unaware had greater risk compared to those without dementia: aHR 1.37 (1.18, 1.59) for all-cause hospitalization and 1.48 (1.28, 1.71) for ED visits; they experienced risk comparable to individuals diagnosed and aware. Older adults with undiagnosed dementia are not at increased risk of acute care utilization after accounting for differences in other characteristics. Individuals unaware of diagnosed dementia demonstrate risk similar to individuals aware of the diagnosis. Increasing diagnosis alone may not affect acute care utilization. The role of awareness warrants further investigation.

Most individuals with dementia are undiagnosed or they/their families are unaware of the diagnosis. Implications of dementia diagnosis and awareness are poorly understood. Our objective was to determine whether undiagnosed dementia or unawareness increases risk of hospitalization or emergency department (ED) visits, outcomes with recognized risk in diagnosed dementia. We linked National Health and Aging Trends Study (NHATS) data to fee-for-service Medicare claims for 4,311 community-living participants in the nationally representative cohort. We assessed probable versus no dementia using validated NHATS dementia criteria, undiagnosed versus diagnosed using Medicare claims, and aware versus unaware using NHATS self or proxy report of diagnosis. Cox proportional hazards models evaluated hospitalization and ED visit risk by time-varying dementia diagnosis and awareness status, adjusting for sociodemographic characteristics, functional impairment, medical comorbidities, and prior hospitalization. Compared to no dementia, persons with dementia who were unaware but diagnosed had greater risk of hospitalization (HR 1.66, 95% CI 1.26-2.19) and ED visits (HR 1.63, 95% CI 1.28-2.08). Persons unaware but diagnosed also had greater risk compared to persons aware and diagnosed (hospitalization HR 1.34, 95% CI 0.98-1.82; ED HR 1.38, 95% CI 1.05-1.83). Persons with undiagnosed dementia demonstrated hospitalization risk similar to persons with no dementia (HR 1.02, 95% CI 0.79-1.31) and similar or potentially lower than persons aware and diagnosed (HR 0.82, 95% CI 0.61-1.10); ED visit findings were similar. Results suggest that being unaware of dementia diagnosis may affect healthcare utilization. Strategies to improve communication and understanding of dementia could potentially reduce hospitalizations and ED visits.

Partnering to Improve Pediatric Asthma Quality.

130 Meeting established canadian benchmarks for access to heart failure (HF) care following emergency department visit and association with outcome

A PROPENSITY-MATCHED COHORT STUDY TO ASSESS THE EFFECTIVENESS OF A COMMUNITY HOSPITAL BASED HEART FUNCTION CLINIC

295 The Forgotten Emergency Department Visit When Assessing Hospital Readmissions

Does lack of a usual source of care or health insurance increase the likelihood of an emergency department visit? Results of a national population-based study

Although 72-hour emergency department (ED) revisits are increasingly used as a hospital metric, there is no known empirical basis for this 72-hour threshold. The objective of this study was to determine the timing of ED revisits for adult patients within 30 days of ED discharge. This was a retrospective cohort study of all nonfederal ED discharges in Florida and Nebraska from April 1, 2010, to March 31, 2011, using data from the Agency for Healthcare Research and Quality (AHRQ) Healthcare Cost and Utilization Project (HCUP). ED discharges were followed forward to identify ED revisits occurring at any hospital within the same state within 30 days. The cumulative hazard of an ED revisit was plotted. Parametric and nonparametric modeling was performed to characterize the rate of ED revisits. There were 4,782,045 ED discharges, with 7.5% (95% confidence interval [CI] = 7.4% to 7.5%) associated with 3-day revisits, and 22.4% (95% CI = 22.3% to 22.4%) associated with 30-day revisits, inclusive of the 3-day revisits. A double-exponential model fit the data best (p < 0.0001), and a single hinge point at 9 days (multivariate adaptive regression splines [MARS] model) yielded the best linear fit to the data, suggesting 9 days as the most reasonable cutoff for identification of acute ED revisits. Multiple stratified and subgroup analyses produced similar results. Future work should focus on identifying primary reasons for potentially avoidable return ED visits instead of on the revisit occurrence itself, thus more directly measuring potential lapses in delivery of high-quality care. Almost one-quarter of ED discharges are linked to 30-day ED revisits, and the current 72-hour ED metric misses close to 70% of these patients. Our findings support 9 days as a more inclusive cutoff for studies of ED revisits.

While recent studies have demonstrated an overall increase in psychiatric visits in the emergency department (ED), none have focused on a nationally representative pediatric population. Understanding trends in pediatric psychiatric ED visits is important because of limited outpatient availability of pediatric specialists, as well as long wait times for psychiatric appointments. The study aim was to evaluate the trends in ED psychiatric visits for children between 2001 and 2010 with comparison by sociodemographic characteristics. This was a retrospective, cross-sectional analysis of ED psychiatric visits for children<18years of age using the National Hospital Ambulatory Medical Care Survey (NHAMCS). Visits were identified by International Classification of Diseases, Ninth Revision (ICD-9), codes. Outcome measures included frequency of visits for children with psychiatric diagnosis codes and odds and adjusted odds of psychiatric visits controlling for temporal, demographic, and geographic factors. From 2001 to 2010, an average of 28.3 million pediatric visits to EDs occurred annually. Among those, an approximately 560,000 (2% of ED visits) were psychiatric visits each year. Pediatric psychiatric ED visits increased from an estimated 491,000 in 2001 to 619,000 in 2010 (p=0.01). Teenagers (adjusted odds ratio [AOR]= 3.92, 95% confidence interval [CI]=3.37 to 4.57) and publicly insured patient visits (AOR= 1.47, 95% CI=1.25 to 1.74) had increased odds of psychiatric ED visits. Pediatric ED psychiatric visits are increasing. Teenagers and children with public insurance appear to be at increased risk. Further investigation is needed to determine what the causative factors are.

The Impact of Heat Waves on Emergency Department Visits in Roanoke, Virginia

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To determine the association between a large-scale, multi-payer primary care redesign-the Comprehensive Primary Care (CPC) Initiative-on outpatient emergency department (ED) and urgent care center (UCC) use and to identify the types of visits that drive the overall trends observed. Medicare claims data capturing characteristics and outcomes of 565674 Medicare fee-for-service (FFS) beneficiaries attributed to 497 CPC practices and 1165284 beneficiaries attributed to 908 comparison practices. We used an adjusted difference-in-differences framework to test the association between CPC and beneficiaries' ED and UCC use from October 2012 through December 2016. Regression models controlled for baseline practice and patient characteristics and practice-level clustering of standard errors. Our key outcomes were all-cause and primary care substitutable (PC substitutable) outpatient ED and UCC visits, and potentially primary care preventable (PPC preventable) ED visits, categorized by the New York University Emergency Department Algorithm. We used a propensity score-matched comparison group of practices that were similar to CPC practices before CPC on multiple dimensions. Both groups of practices had similar growth in ED and UCC visits in the two-year period before CPC. Comprehensive Primary Care practices had 2% (P=.06) lower growth in all-cause ED visits than comparison practices. They had 3% (P=.02) lower growth in PC substitutable ED visits, driven by lower growth in weekday PC substitutable visits (4%, P=.002). There was 3% (P=.04) lower growth in PPC preventable ED visits with no weekday/nonweekday differential. As expected, our falsification test showed no difference in ED visits for injuries. UCC visits had 9% lower growth for both all-cause (P=.08) and PC substitutable visits (P=.07). Our results suggest that greater access to the practice and more effective primary care both contributed to the lower growth in ED and UCC visits during the initiative.

Hospital-Based, Acute Care Use Among Patients Within 30 Days of Discharge After Coronary Artery Bypass Surgery

States that have legalized cannabis for medicinal or retail use have noted increases in emergency department (ED) visits associated with cannabis-associated harms. However, most studies are retrospective and identify cannabis-related visits using diagnosis codes or THC-positive urine drug immunoassays. These identification methods are limited. ICD codes are infrequently used in adult ED cases of exposure to drugs of abuse and clinicians may not explicitly document diagnosis of drug use, even when highly suspected or confirmed by patients.

Analysis of Emergency Department Visits for Palpitations (from the National Hospital Ambulatory Medical Care Survey)