Individual predictors of frequent emergency department use: a scoping review

Preoperative Emergency Department Usage is a Sentinel Marker of Worsened Posterior Lumbar Interbody Fusion Outcome

BACKGROUND

Utilization of the emergency department (ED) is associated with medical and social comorbidities. These factors may also be associated with medical complications after complex surgeries. This study investigated how preoperative ED use increases risk of posterior lumbar interbody fusion (PLIF) complications.

METHODS

We identified adult PLIF patients treated between 2016 and 2019 in the PearlDiver Claims Database. Clinical variables including preoperative ED use within 180 days were collected using International Classification of Disease (ICD-10) codes. Risk difference was calculated, and multivariable regression was performed.

RESULTS

This study included 13,010 (21.1%) patients who went to the ED before surgery and 48,065 (78.9%) who did not. Having a preoperative ED visit significantly increased risk of a postoperative ED visit by 28.7 percentage points, 90-day readmission by 3.8 percentage points, and 30-day major-medical complications by 3.4 percentage points. Risk of these outcomes increased in a dose-dependent fashion. Compared with patients with zero preoperative ED visits, patients who had 6 or more preoperative ED visits had an 82.0 percentage point increase in risk for a postoperative ED visit, a 46.5 percentage point increase for six or more ED visits, a 6.1 percentage point increase for major medical complications, and 10.6% increase for readmission.

CONCLUSIONS

Patients with any preoperative ED visit had an increased risk for postoperative ED use, readmission, and medical complications. The risk difference increased with each additional preoperative visit. Patient counseling and protocols that reduce preventable ED visit in the preoperative period may reduce a patient's risk for costly postoperative complications.

Analyzing temporal patterns in frequent emergency department visits among oncology patients using semantic similarity measures

PURPOSE

Patients with cancer face complex challenges that often lead them to seek care in emergency departments (EDs) for acute symptoms and complications. While previous studies have examined preventable ED visits by patients with cancer, less attention has focused on frequent ED use in this population. This study aimed to explore the temporal visit patterns of frequent ED users with cancer.

METHODS

This retrospective study analyzed ED visit records from 10 large hospitals (five urban, five rural) in Illinois from 2018 to 2019. Adult frequent ED users, defined as those with four or more visits in a year, were classified as cancer or non-cancer users based on cancer-related diagnoses in their first four visits. The Wu-Palmer method was used to calculate semantic similarity between diagnoses.

RESULTS

Of the 98,246 frequent ED users, 18.2 % had at least one cancer-related visit. Cancer patients made up 21.7 % of frequent users in urban EDs and 7.6 % in rural EDs. Cancer patients had slightly higher proximity scores than non-cancer patients. Patients with central nervous system malignancies had the highest median proximity score, while breast cancer patients had a lower score. In both urban and rural EDs, cancer patients had significantly higher proximity scores than non-cancer patients, with the difference being more pronounced in urban EDs.

CONCLUSION

Frequent ED visits by oncology patients are more likely to be for similar reasons compared to non-cancer frequent users. These findings highlight the need for targeted care coordination for oncology patients who frequently visit the ED, potentially reducing repeat visits through improved outpatient management. Understanding the distinct patterns of ED utilization among cancer patients could help prioritize resource allocation and care pathways.

Relationship Between Social Risk Factors and Emergency Department Use: National Health Interview Survey 2016-2018

Background

Evidence shows that social risks are highly prevalent in the patient population that presents to the emergency department (ED) for care; however, understanding the relationship between social risk factors and ED utilization at the population level remains unknown.

Methods

We used the National Health Interview Survey from the 2016-2018 sample adult files. The sample included 82,364 individuals, representing a population size of 238,888,238. The primary independent variables included six social risk factors: economic instability; lack of community; educational deficit; food insecurity; social isolation; and inadequate access to care. The outcome included ED use in the prior year. Covariates included age, race/ethnicity, insurance status, obesity, mental health (depression/anxiety), and comorbidities. We ran logistic regression models to test the relationship between the independent and dependent variables adjusting for covariates.

Results

In the study sample, 20% had at least one ED visit in the prior year. In the fully adjusted model, individuals reporting economic instability (odds ratio [OR] 1.33, 95% confidence interval [CI] 1.25-1.42), lack of community (OR 1.10, 95% CI 1.05-1.15), educational deficit (OR 1.12, 95% CI 1.06-1.18), food insecurity (OR 1.77, 95% CI 1.66-1.89), and social isolation (OR 1.32, 95% CI 1.26-1.39) had significantly higher odds of ED use. Inadequate access to care was significantly related to lower odds of ED use (OR 0.75, 95% CI 0.69-0.81).

Conclusions

Social risk factors are significantly associated with higher odds of ED use in the United States adult population. Interventions that integrate social and medical needs are greatly needed, as is understanding the role that preventive medicine may play in reducing avoidable ED visits.

Classes of outpatient quality of care among individuals with substance-related disorders, based on a survey and health insurance registry

OBJECTIVES

Improving quality of care for individuals with substance-related disorders (SRD) should be a priority considering SRD are associated with high morbidity. This study aimed to identify classes of individuals with SRD based on their clinical characteristics and the quality of outpatient care they received, and to verify whether better quality of care was associated with other respondent characteristics and more favorable subsequent outcomes.

METHODS

Data came from the 2013-14 and 2015-16 Canadian Community Health Survey (N = 42,099), merged with administrative data from Quebec's health insurance registry. Investigating a cohort of 1473 individuals with SRD, we conducted Latent class analysis based on the respondents' diagnoses and outpatient quality of care indicators such as access, diversity, continuity and regularity of care received in the 12 months preceding interview. Chi-Square, Fisher's exact tests or t-tests, and logistic regression associate classes with sociodemographic and health behavior (e.g., suicidal behaviors) correlates, and outcomes (repeated emergency department use, hospitalization, quality of life) over the three months following interview, respectively.

RESULTS

The study identified four classes: (1) Individuals with polysubstance-related disorders and other health disorders, receiving high diversity and moderate regularity of care (6 % of sample); (2) Individuals with alcohol-related disorders, receiving low quality of care (41 %); (3) Individuals with drug-related disorders, receiving high overall quality of care (9 %); and (4) Individuals with alcohol-related disorders, receiving high continuity of family doctor care (44 %). Classes 2 and 4 showed better social conditions (e.g., higher education), health behaviors, and subsequent outcomes than Classes 1 and 3, despite receiving lower quality of care - especially mental healthcare.

CONCLUSION

Study outcomes related more to health and social conditions than to the quality of outpatient care received, especially as outpatient care alone might not meet needs of Classes 1 and 3 individuals having important health and social issues, unmet care needs and worse outcomes. Results suggest that interventions like assertive community treatment or intensive case management with integrated SRD-mental health disorders treatment could better respond to the needs of Classes 1 and 3. Overall, enhanced care, including peer support, might benefit all individuals with SRD.

Pre-Assault Diagnoses Associated with Post-Assault Emergency Department Visits After Recent Sexual Assault

Characteristics associated with individuals who frequent the emergency department at higher rates have been well established; however, factors associated with greater emergency department visits following a recent sexual assault are largely unknown. The current study evaluated the associations between pre-assault factors such as substance use and physical injuries, assault characteristics such as genital injury, non-genital injury, alcohol or drug use involvement, intimate partner involvement, and emergency department visits one-year after a sexual assault medical forensic exam (SAMFE). The current study included a medical record review of 123 individuals who received a SAMFE at a hospital in the United States. Demographic variables, characteristics of the sexual assault, pre-sexual assault diagnoses, frequency of SAMFEs, and post-SAMFE emergency department visits were examined. A negative binomial regression was used to examine these factors on post-SAMFE emergency department visits. Results indicated that alcohol or drug use during an assault was associated with fewer emergency department visits post-SAMFE. Substance use and physical injury disorders pre-SAMFE were positively associated with post-SAMFE emergency department visits. Findings provide important insight for prevention strategies to potentially increase access to mental and physical health care post-assault to reduce the risk of repeated emergency department visits among recent survivors of sexual assault.

Exploring the reliability and profile of frequent mental health presentations using different methods: An observational study using statewide ambulance data over a 4-year period

INTRODUCTION

A disproportionate number of mental health presentations to emergency services are made by frequent presenters. No current consensus definition of a frequent presenter exists. Using a statewide population-based ambulance database, this study (i) applied previous statistical methods to determine thresholds for frequent presenters, (ii) explored characteristics of the identified frequent presenter groups compared to non-frequent presenters and (iii) assessed the reliability of these methods in predicting continued frequent presenter status over time.

METHODS

Statistical methods utilised in previous studies to identify frequent presenters were applied to all ambulance attendances for mental health symptoms, self-harm and alcohol and other drug issues between 1 January 2017 and 31 December 2020 in Victoria, Australia. Differences in characteristics between identified frequent and non-frequent presenter groups were determined by logistic regression analysis. The consistency of agreement of frequent presenter status over time was assessed using intraclass correlation coefficients.

RESULTS

Thresholds for frequent presenters ranged from a mean of 5 to 39 attendances per calendar year, with groups differing in size, service use and characteristics. Compared to non-frequent presenters, frequent presenters had greater odds of being female, presenting with self-harm, experiencing social disadvantage or housing issues, involving police co-attendance and being transported to hospital. All frequent presenter definitions had poor reliability in predicting ongoing frequent presentations over time.

CONCLUSION

A range of methods can define frequent presenters according to thresholds of yearly service use. Reasons for identifying frequent presenters may influence the method chosen. Future studies should explore definitions that capture the dynamic nature of presentations by this group.

Frequent callers contacting the Norwegian national emergency medical number 113: a retrospective study

BACKGROUND

Calling for help is the first link in the chain of survival; however, few studies have investigated the challenges faced by frequent callers (FCs) to emergency medical communication centres (EMCCs). This study aimed to explore the characteristics of FCs and the nature of their calls to the Bergen EMCC, Norway.

METHODS

This was a retrospective analysis of all emergency calls to the Bergen EMCC over three consecutive years (2019-2021). Bergen is the second-largest city in Norway, and the Bergen EMCC and ambulance services are part of the specialist medical service, covering a population of 460,000. The Bergen EMCC receives approximately 60,000 emergency calls per year. The study population comprised all adults identified during emergency medical calls. FCs were defined as individuals who registered five or more calls over 12 consecutive months during the three-year period.

RESULTS

The analysis included approximately 50,000 individuals, who made > 90,000 calls during the study period. Of those, 1,594 (3.2%) were FCs, accounting for approximately one in four (21,339 of 90,085, 23.7%) calls. The FCs included more men (882 of 1,594 (55.3%) vs. 24,204 of 47,564 (50.9%)) and registered a lower proportion of calls with an acute degree of urgency (6,051 of 21,339 calls (28.4%) vs. 30,276 of 68,746 calls (44.0%)). Calls from FCs showed an even occurrence throughout the week, peaking between 19:00 h and 20:00 h. Compared with calls from non-FCs, calls from FCs had a higher proportion of 'no response/verbal referral to local emergency medical department' and involved a lower proportion of hospital transfers. The EMCC most frequently used the medical criterion 'Mental health problems/suicide' for calls from FCs.

CONCLUSIONS

FCs were common, and more often men. The EMCC dispatched ambulances or admitted patients to hospitals less frequently following these calls. Many of these situations could be handled in other parts of the healthcare system, reducing the burden on EMCCs, and providing more suitable services for FCs. Thus, EMCCs should identify and adjust patient management to match their actual needs.

Case management in primary healthcare for people with complex needs to improve integrated care: a large-scale implementation study protocol

INTRODUCTION

Case management (CM) is among the most studied effective models of integrated care for people with complex needs. The goal of this study is to scale up and assess CM in primary healthcare for people with complex needs.

METHODS AND ANALYSIS

The research questions are: (1) which mechanisms contribute to the successful scale-up of CM for people with complex needs in primary healthcare?; (2) how do contextual factors within primary healthcare organisations contribute to these mechanisms? and (3) what are the relationships between the actors, contextual factors, mechanisms and outcomes when scaling-up CM for people with complex needs in primary healthcare? We will conduct a mixed methods Canadian interprovincial project in Quebec, New-Brunswick and Nova Scotia. It will include a scale-up phase and an evaluation phase. At inception, a scale-up committee will be formed in each province to oversee the scale-up phase. We will assess scale-up using a realist evaluation guided by the RAMESES checklist to develop an initial programme theory on CM scale-up. Then we will test and refine the programme theory using a mixed-methods multiple case study with 10 cases, each case being the scalable unit of the intervention in a region. Each primary care clinic within the case will recruit 30 adult patients with complex needs who frequently use healthcare services. Qualitative data will be used to identify contexts, mechanisms and certain outcomes for developing context-mechanism-outcome configurations. Quantitative data will be used to describe patient characteristics and measure scale-up outcomes.

ETHICS AND DISSEMINATION

Ethics approval was obtained. Engaging researchers, decision-makers, clinicians and patient partners on the study Steering Committee will foster knowledge mobilisation and impact. The dissemination plan will be developed with the Steering Committee with messages and dissemination methods targeted for each audience.

Neutrophil-to-lymphocyte ratio as a predictor for outcomes in patients with short-term emergency department revisits

BACKGROUND

Analysis of short-term emergency department (ED) revisits is a common emergency care quality assurance practice. Previous studies have explored various risk factors of ED revisits; however, laboratory data were usually omitted. This study aimed to evaluate the prognostic significance of neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte (PLR), and systemic immune-inflammation index (SII) in predicting outcomes of patients revisiting the ED.

METHODS

This retrospective observational cohort study investigated short-term ED revisit patients. The primary outcome measure was high-risk ED revisit, a composite of in-hospital mortality or intensive care unit (ICU) admission after 72-hour ED revisit. The NLR, PLR, and SII were investigated as potential prognostic predictors of ED revisit outcomes.

RESULTS

A total of 1916 encounters with short-term ED revisit patients were included in the study; among these, 132 (6.9%) encounters, comprising 57 in-hospital mortalities and 95 ICU admissions, were high-risk revisits. High-risk revisit patients had significantly higher NLR, PLR, and SII (11.6 vs 6.6, p < 0.001; 26.2 vs 18.9, p = 0.004; 2209 vs 1486, p = 0.002, respectively). Multiple regression analysis revealed revisit-NLR as an independent factor for predicting poor outcomes post-ED revisits (odds ratio: 1.031, 95% CI: 1.017-1.045, p < 0.001); an optimal cut-off value of 7.9 was proven for predicting high-risk ED revisit.

CONCLUSION

The intensity of the inflammatory response expressed by NLR was an independent predictor for poor outcomes of ED revisits and should be considered when ED revisits occur. Future prediction models for ED revisit outcomes can include revisit-NLR as a potential predictor to reflect the progressive conditions in ED patients.

Non-emergency department (ED) interventions to reduce ED utilization: a scoping review

BACKGROUND

Emergency department (ED) crowding is a global burden. Interventions to reduce ED utilization have been widely discussed in the literature, but previous reviews have mainly focused on specific interventions or patient groups within the EDs. The purpose of this scoping review was to identify, summarize, and categorize the various types of non-ED-based interventions designed to reduce unnecessary visits to EDs.

METHODS

This scoping review followed the JBI Manual for Evidence Synthesis and the PRISMA-SCR checklist. A comprehensive structured literature search was performed in the databases MEDLINE and Embase from 2008 to March 2024. The inclusion criteria covered studies reporting on interventions outside the ED that aimed to reduce ED visits. Two reviewers independently screened the records and categorized the included articles by intervention type, location, and population.

RESULTS

Among the 15,324 screened records, we included 210 studies, comprising 183 intervention studies and 27 systematic reviews. In the primary studies, care coordination/case management or other care programs were the most commonly examined out of 15 different intervention categories. The majority of interventions took place in clinics or medical centers, in patients' homes, followed by hospitals and primary care settings - and targeted patients with specific medical conditions.

CONCLUSION

A large number of studies have been published investigating interventions to mitigate the influx of patients to EDs. Many of these targeted patients with specific medical conditions, frequent users and high-risk patients. Further research is needed to address other high prevalent groups in the ED - including older adults and mental health patients (who are ill but may not need the ED). There is also room for further research on new interventions to reduce ED utilization in low-acuity patients and in the general patient population.

Emergency department utilization after elbow arthroscopy

Background

Elbow arthroscopy has defined indications for which technical pearls and outcomes have been described. However, other aspects of the postoperative course, such as postprocedural emergency department (ED) visits, have received less attention. The current study defined the incidence and factors associated with ED visits in the 90 days following elbow arthroscopy by leveraging a large, national, multiinsurance, administrative database.

Methods

Adult patients who underwent elective elbow arthroscopy were identified in the 2010 to Q1 2022 PearlDiver Mariner161 national administrative database. Those who visited the ED in the 90 days following surgery were identified and compared to those who did not based on age, sex, Elixhauser Comorbidity Index, geographic region of the United States, and insurance type by multivariate analyses. The timing (weeks following surgery), reasons for ED visit (elbow-related or not), and ED-to-hospital admission (presence or absence) were also assessed. Finally, the rate of those who were admitted during an ED visit was described.

Results

A total of 16,310 elbow arthroscopy patients were identified, of which ED visits in the 90 days following surgery were noted for 1086 (6.7%). ED visits were independently associated with younger age (odds ratio [OR, 95% confidence interval (CI)]: 1.23 [1.17, 1.29] per decade decrease), higher Elixhauser Comorbidity Index (OR [95% CI]: 1.21 [1.19, 1.23] per 1-point increase), different geographic region (OR [95% CI]: 1.42 [1.19, 1.71] for Midwest relative to West), and insurance (OR [95% CI]: 1.88 [1.48, 2.39] for Medicaid relative to Commercial) (P < .001 for each). The incidence of all-cause ED visits was highest during the first two postoperative weeks and gradually decreased over the following weeks. The reason for ED visits related to the elbow decreased from 65% in month one, to 37.7% in month two, to 26.6% in month three. Of those visiting the ED, 12.4% went on to be admitted (for any reason).

Conclusion

A significant proportion of patients from a large cohort of elbow arthroscopy patients visited the ED at least once in the 90 days following surgery. The defined associated factors and timing of these ED visits can help optimize postoperative care pathways.

Emergency Department Use among Patients with Mental Health Problems: Profiles, Correlates, and Outcomes

Patients with mental health (MH) problems are known to use emergency departments (EDs) frequently. This study identified profiles of ED users and associated these profiles with patient characteristics and outpatient service use, and with subsequent adverse outcomes. A 5-year cohort of 11,682 ED users was investigated (2012-2017), using Quebec (Canada) administrative databases. ED user profiles were identified through latent class analysis, and multinomial logistic regression used to associate patients' characteristics and their outpatient service use. Cox regressions were conducted to assess adverse outcomes 12 months after the last ED use. Four ED user profiles were identified: "Patients mostly using EDs for accessing MH services" (Profile 1, incident MDs); "Repeat ED users" (Profile 2); "High ED users" (Profile 3); "Very high and recurrent high ED users" (Profile 4). Profile 4 and 3 patients exhibited the highest ED use along with severe conditions yet received the most outpatient care. The risk of hospitalization and death was higher in these profiles. Their frequent ED use and adverse outcomes might stem from unmet needs and suboptimal care. Assertive community treatments and intensive case management could be recommended for Profiles 4 and 3, and more extensive team-based GP care for Profiles 2 and 1.

Examining management plans for patients who frequently presented to the emergency department

BACKGROUND

Patients who frequently present to Emergency Department (ED) experience complex health and social needs. While research has examined interventions that aim to decrease frequent ED attendances, there is a need to understand the types of interventions provided to patients by hospital clinicians during presentations.

METHODS

Using qualitative content analysis, 82 management plans were evaluated to understand the scope and type of interventions provided by clinicians for patients frequently presenting to the ED at the Royal Melbourne Hospital, Australia.

RESULTS

Patients often presented to the ED due to mental and psychological distress, substance use and physical health concerns alongside psychosocial vulnerabilities. The goals of care documented in plans focussed on management of health issues, aggression within the ED, and coordinating care with community services. Recommended interventions addressed presenting needs with multi-disciplinary approach to respond to distress and aggression. Finally, the plans provided insight into service coordination dynamics between the ED and community-based health and social care services.

CONCLUSIONS

The plans recommended interventions that sought to provide holistic care for patients in collaboration with relevant community-based services. The findings suggest that clinicians in the ED can provide appropriate and meaningful care for patients who experience frequent presentations.

Emergency Department Use Among Adults Receiving Dialysis

Importance

People with kidney failure receiving maintenance dialysis visit the emergency department (ED) 3 times per year on average, which is 3- to 8-fold more often than the general population. Little is known about the factors that contribute to potentially preventable ED use in this population.

Objective

To identify the clinical and sociodemographic factors associated with potentially preventable ED use among patients receiving maintenance dialysis.

Design, Setting, and Participants

This cohort study used linked administrative health data within the Alberta Kidney Disease Network to identify adults aged 18 years or older receiving maintenance dialysis (ie, hemodialysis or peritoneal dialysis) between April 1, 2010, and March 31, 2019. Patients who had been receiving dialysis for more than 90 days were followed up from cohort entry (defined as dialysis start date plus 90 days) until death, outmigration from the province, receipt of a kidney transplant, or end of study follow-up. The Andersen behavioral model of health services was used as a conceptual framework to identify variables related to health care need, predisposing factors, and enabling factors. Data were analyzed in March 2024.

Main Outcomes and Measures

Rates of all-cause ED encounters and potentially preventable ED use associated with 4 kidney disease-specific ambulatory care-sensitive conditions (hyperkalemia, heart failure, volume overload, and malignant hypertension) were calculated. Multivariable negative binomial regression models were used to examine the association between clinical and sociodemographic factors and rates of potentially preventable ED use.

Results

The cohort included 4925 adults (mean [SD] age, 60.8 [15.5] years; 3071 males [62.4%]) with kidney failure receiving maintenance hemodialysis (3183 patients) or peritoneal dialysis (1742 patients) who were followed up for a mean (SD) of 2.5 (2.0) years. In all, 3877 patients had 34 029 all-cause ED encounters (3100 [95% CI, 2996-3206] encounters per 1000 person-years). Of these, 755 patients (19.5%) had 1351 potentially preventable ED encounters (114 [95% CI, 105-124] encounters per 1000 person-years). Compared with patients with a nonpreventable ED encounter, patients with a potentially preventable ED encounter were more likely to be in the lowest income quintile (38.8% vs 30.9%; P < .001); to experience heart failure (46.8% vs 39.9%; P = .001), depression (36.6% vs 32.5%; P = .03), and chronic pain (60.1% vs 54.9%; P = .01); and to have a longer duration of dialysis (3.6 vs 2.6 years; P < .001). In multivariable regression analyses, potentially preventable ED use was higher for younger adults (incidence rate ratio [IRR], 1.69 [95% CI, 1.33-2.15] for those aged 18 to 44 years) and patients with chronic pain (IRR, 1.35 [95% CI, 1.14-1.61]), greater material deprivation (IRR, 1.57 [95% CI, 1.16-2.12]), a history of hyperkalemia (IRR, 1.31 [95% CI, 1.09-1.58]), and historically high ED use (ie, ≥3 ED encounters in the prior year; IRR, 1.46 [95% CI, 1.23-1.73).

Conclusions and Relevance

In this study of adults receiving maintenance dialysis in Alberta, Canada, among those with ED use, 1 in 5 had a potentially preventable ED encounter; reasons for such encounters were associated with both psychosocial and medical factors. The findings underscore the need for strategies that address social determinants of health to avert potentially preventable ED use in this population.

Public Beliefs About Accessibility and Quality of Emergency Departments in Germany

Background

It is well established that emergency department (ED) crowding leads to worse health outcomes. Although various patient surveys provide information about reasons to visit EDs, less is known in terms of beliefs about EDs among the general population. This study examines public beliefs regarding accessibility and quality of EDs and their associations with social characteristics (gender, age, education, immigration background) as well as knowledge about emergency care services and health literacy.

Methods

We conducted a cross-sectional study based on a random sample of 2,404 adults living in Hamburg, Germany, in winter 2021/2022. We developed eight statements regarding accessibility and quality of EDs leading to two scales (Cronbach's α accessibility = 0.76 and quality of care = 0.75). Descriptive statistics of the eight items are shown and linear regression were conducted to determine associations of the two scales with social characteristics as well as knowledge about emergency care services and health literacy (HLS-EU-Q6).

Results

Nearly 44% of the respondents agreed that "you can always go to an ED, if you do not get a short-term appointment with a general practitioner or specialist." And 38% agreed with the statement, "If you do not have the time during normal practice hours due to your work, you can always go to an ED." In terms of quality, 38% believed that doctors in EDs are more competent than doctors in general practice, and 25% believed that doctors in EDs are more competent than doctors in specialized practices. In the fully adjusted model, public beliefs about emergency care accessibility and quality of EDs were significantly associated with all social characteristics and knowledge of emergency care options with the strongest associations between knowledge and accessibility (β = -0.17; P < 0.001) and between education and quality (β = -0.23; P < 0.001).

Conclusion

We found endorsement of public beliefs about accessibility and quality of EDs that can lead to inappropriate utilization. Our results also suggest that knowledge of different emergency services plays an important role. Therefore, after system-related reorganizations of emergency care, information campaigns about such services tailored to socially deprived populations may help alleviate the issue of crowding.

Clinical and longitudinal patterns of frequent presenters to emergency departments: A multi-centre data linkage analysis

OBJECTIVE

To describe clinical characteristics and longitudinal patterns of representation in a cohort of patients who frequently present to EDs for care.

METHODS

A retrospective data analysis linking routinely collected ED data across three hospitals. The study population consisted of patients who presented to any ED on 10 or more occasions in any continuous 365-day period from 1 July 2015 to 30 June 2021. Presenting complaints were divided into those with any mental health, drug and alcohol, or social presentations (MHDAS group) and those without (non-MHDAS group). Outcomes of interest were number of presentations as well as temporal and facility clustering of presentations. A per patient regression analysis was performed to identify independent risk factors for increased presentations.

RESULTS

Presentations by 1640 frequent ED presenters in the study constituted 4.6% of total ED presentations. MHDAS study group were younger, predominantly English speaking, twice as likely to be married, had lower hospital admission rates and almost three times as many of them did not wait for treatment. Statistically significant differences were also found between these groups regarding presentation clustering, facility entropy, each of the four categories of the number of ED presentations, and Index of Relative Socio-Economic Advantage and Disadvantage.

CONCLUSION

Representations associated with MHDAS have a different trajectory of representation episodes compared to non-MHDAS group. Escalating number of presentations and clustering are important predictors of future representation numbers. Those 'did not waits' who appear to be representing would be the highest risk of ongoing and persistent representations in the future and should be the target of early interventions to ensure they are accessing appropriate care before this happens.

Emergency care visits at a South African hospital: Implications for healthcare services and policy

BACKGROUND

A robust knowledge on the pattern of use of emergency care resources not only serves as an indicator of universal access to care but also provides a basis for quality improvement within the health system. This study was undertaken to describe the pattern of emergency room visits at Brits District Hospital (BDH) in North West province, South Africa. The objectives of this study were to determine the sociodemographic characteristics of emergency department (ED) users and other patterns of ED use.

METHODS

This was a cross-sectional descriptive study that was conducted at a district hospital. All patients who reported for emergency care in the ED in 2016 were eligible for the study. Data were extracted and analysed from a systematic sample of 355 clinical notes and hospital administrative records.

RESULTS

The age group that visited the ED most frequently (25.3%) was 25-34 years old. A high proportion of the ED users (60%) were self-referred, and only 38% were transported by the emergency medical response services (EMRS). Few (5.6%) presentations were of a non-urgent nature. Trauma-related conditions accounted for the most frequent presentation at the ED (36.5%).

CONCLUSION

Although most ED users were self-referred, their clinical presentations were appropriate and underscore the need for policy strategies to reduce the burden of trauma in the catchment populationContribution: The study findings may have an impact on future health policies by providing decision-makers with baseline information on the pattern of use of ED resources, ensuring better resource deployment and greater access to care.

Characteristics for Low, High and Very High Emergency Department Use for Mental Health Diagnoses from Health Records and Structured Interviews

Introduction

Patients with mental health diagnoses (MHD) are among the most frequent emergency department (ED) users, suggesting the importance of identifying additional factors associated with their ED use frequency. In this study we assessed various patient sociodemographic and clinical characteristics, and service use associated with low ED users (1-3 visits/year), compared to high (4-7) and very high (8+) ED users with MHD.

Methods

Our study was conducted in four large Quebec (Canada) ED networks. A total of 299 patients with MHD were randomly recruited from these ED in 2021-2022. Structured interviews complemented data from network health records, providing extensive data on participant profiles and their quality of care. We used multivariable multinomial logistic regression to compare low ED use to high and very high ED use.

Results

Over a 12-month period, 39% of patients were low ED users, 37% high, and 24% very high ED users. Compared with low ED users, those at greater probability for high or very high ED use exhibited more violent/disturbed behaviors or social problems, chronic physical illnesses, and barriers to unmet needs. Patients previously hospitalized 1-2 times had lower risk of high or very high ED use than those not previously hospitalized. Compared with low ED users, high and very high ED users showed higher prevalence of personality disorders and suicidal behaviors, respectively. Women had greater probability of high ED use than men. Patients living in rental housing had greater probability of being very high ED users than those living in private housing. Using at least 5+ primary care services and being recurrent ED users two years prior to the last year of ED use had increased probability of very high ED use.

Conclusion

Frequency of ED use was associated with complex issues and higher perceived barriers to unmet needs among patients. Very high ED users had more severe recurrent conditions, such as isolation and suicidal behaviors, despite using more primary care services. Results suggested substantial reduction of barriers to care and improvement on both access and continuity of care for these vulnerable patients, integrating crisis resolution and supported housing services. Limited hospitalizations may sometimes be indicated, protecting against ED use.

Profiles of Emergency Department Users with Psychiatric Disorders Related to Barriers to Outpatient Care

Emergency department (ED) overcrowding is a growing problem worldwide. High ED users have been historically targeted to reduce ED overcrowding and associated high costs. Patients with psychiatric disorders, including substance-related disorders (SRDs), are among the largest contributors to high ED use. Since EDs are meant for urgent cases, they are not an appropriate setting for treating recurrent patients or replacing outpatient care. Identifying ED user profiles in terms of perceived barriers to care, service use, and sociodemographic and clinical characteristics is crucial to reduce ED use and unmet needs. Data were extracted from medical records and a survey was conducted among 299 ED patients from 2021 to 2022 in large Quebec networks. Cluster algorithms and comparison tests identified three profiles. Profile 1 had the most patients without barriers to care, with case managers, and received the best primary care. Profile 2 reported moderate barriers to care and low primary care use, best quality of life, and more serious psychiatric disorders. Profile 3 had the most barriers to care, high ED users, and lower service satisfaction and perceived mental/health conditions. Our findings and recommendations inform decision-makers on evidence-based strategies to address the unmet needs of these vulnerable populations.

Variations in the intended utilization of emergency care in case of gastrointestinal diseases

Frequent utilization of emergency care and overcrowded emergency departments (EDs) are highly relevant topics due to their harmful consequences for patients and staff. The present study examines variations of intended health care use in urgent and non-urgent cases among the general population. In a cross-sectional telephone survey, a sample of N = 1,204 adults residing in Hamburg, Germany, was randomly drawn. At the beginning of the survey, one of 24 different vignettes (case stories) describing symptoms of inflammatory gastrointestinal diseases were presented to the participants. The vignettes varied in sex (male/female), age (15, 49, 72 years), daytime (Tuesday morning, Tuesday evening), and urgency (low, high). Participants were asked in an open-ended question about their primal intended utilization if they or their children would be affected by such symptoms. Overall, about 14 % chose emergency facilities (ED, ambulance, emergency practice) despite presentation of non-urgent conditions (n = 602). Intended emergency care use varied considerably even if the degree of urgency was comparable. Adolescence, male sex, and symptoms occurring in the evening were associated with increased ED and ambulance use. Inappropriate utilization of ED and ambulance (analyses regarding utilization due to non-urgent problems) was more often observed among male respondents and those with a migration background (1st generation). Information campaigns focused on emergency care use and reorganisation of emergency care wards are possible interventions.

Supporting High-impAct useRs in Emergency Departments (SHarED) quality improvement: a mixed-method evaluation

BACKGROUND

The need to better manage frequent attenders or high-impact users (HIUs) in hospital emergency departments (EDs) is widely recognised. These patients often have complex medical needs and are also frequent users of other health and care services. The West of England Academic Health Science Network launched its Supporting High impAct useRs in Emergency Departments (SHarED) quality improvement programme to spread a local HIU intervention across six other EDs in five Trusts.

AIM

SHarED aimed to reduce ED attendance and hospital admissions by 20% for enrolled HIUs. To evaluate the implementation of SHarED, we sought to learn about the experience of staff with HIU roles and their ED colleagues and assess the impact on HIU attendance and admissions.

METHODS

We analysed a range of data including semistructured interviews with 10 HIU staff; the number of ED staff trained in HIU management; an ED staff experience survey; and ED attendances and hospital admissions for 148 HIUs enrolled in SHarED.

RESULTS

Staff with HIU roles were unanimously positive about the benefits of SHarED for both staff and patients. SHarED contributed to supporting ED staff with patient-centred recommendations and provided the basis for more integrated case management across the health and care system. 55% of ED staff received training. There were improvements in staff views relating to confidence, support, training and HIUs receiving more appropriate care. The mean monthly ED attendance per HIU reduced over time. Follow-up data for 86% (127/148) of cases showed a mean monthly ED attendances per HIU reduced by 33%, from 2.1 to 1.4, between the 6 months pre-enrolment and post-enrolment (p<0.001).

CONCLUSION

SHarED illustrates the considerable potential for a quality improvement programme to promote more integrated case management by specialist teams across the health and care system for particularly vulnerable individuals and improve working arrangements for hard-pressed staff.

School-Based Telemedicine and Reduced Avoidable Emergency Care Among Rural Pediatric Patients

Objective: Children living in rural communities have disparate access to preventive health care, shifting the burden of care delivery to emergency services. This study examined the association of school-based telemedicine (SBT) and avoidable emergency department (ED) utilization in rural historically underserved pediatric patients served through an SBT program. Methods: A retrospective analysis was conducted using electronic medical records and claims data from a large integrated health care system serving as the majority health care provider in the area. Participants included all pediatric patients served through an SBT program between 2017 and 2020 across three rural North Carolina counties. The study was a quasi-experimental before/after design comparing 12-month time periods before and after a patient's index virtual care visit. A subset of patients served 12 months before the start of the coronavirus 2019 (COVID-19) pandemic in 2020 was extracted and analyzed separately for a sensitivity analysis. Results: The complete sample included 1,236 patients. The odds of having an avoidable ED visit were reduced by 33% between time periods, and the estimated count of visits was reduced by 26%. (Models were adjusted for race/ethnicity, gender, age, and insurance payer.) No significant differences in unavoidable ED utilization were observed. The sensitivity analysis showed similar trends. Conclusions: Results demonstrate that telemedicine can improve access to health care and may offset the burden of avoidable care through emergency health services. Policy changes and increased use during the COVID-19 pandemic have created an optimal environment for telemedicine expansion to reduce health care access disparities.

Older Adult Frequent 9-1-1 Callers for Emergency Medical Services in a Large Metropolitan City: Individual- and System-Level Considerations

BACKGROUND

High utilizers of 9-1-1 place a substantial burden on emergency medical services (EMS). Results of a retrospective review of records data of the City of Los Angeles Fire Department (LAFD) showed a significant increase in older adult high utilizers of 9-1-1.

OBJECTIVE

The objective of this study was to explore individual- and system-level factors implicated in EMS use among older adults, and to provide system recommendations to mitigate overuse.

METHODS

A phenomenological study was conducted, drawing from LAFD EMS records between 2012 and 2016 to identify and contact high-utilizing patients older than 50 years, their family, agency representatives, and LAFD personnel. Interviews were recorded, transcribed, and coded and a thematic analysis was completed.

RESULTS

We conducted in-depth interviews with 27 participants, including patients (n = 8), their families (n = 6), social service agency representatives (n = 3), and LAFD personnel (n = 10). The following cross-cutting themes emerged: nature of 9-1-1 calls, barriers to access, and changing the system. In addition, LAFD and social service agency representatives identified the role of EMS responders and social agency representatives. Patients and their families agreed that previous encounters and interactions with emergency care responders were relevant factors.

CONCLUSIONS

This study described reasons for 9-1-1 calls related to medical and social service needs, including mental health care. Our analysis offers insight from different stakeholders' perspectives on access to medical care and types of barriers that interfere with medical care. All groups shared recommendations to advance access to medical and mental health care.

Profiles of patients with substance-related disorders who dropped out or not from addiction treatment

This longitudinal study identified profiles of patients with substance-related disorders (SRD) who did or did not drop out of specialized addiction treatment, integrating various patterns of outpatient service use. Medical administrative databases of Quebec (Canada) were used to investigate a cohort of 16,179 patients with SRD who received specialized addiction treatment. Latent class analysis identified patient profiles, based on multi-year outpatient service use. Four patient profiles related to treatment dropout were identified: patients who did not drop out and were low service users (Profile 1); patients who did not drop out and were high service users (Profile 2); patients who dropped out and were low service users (Profile 3); patients who dropped out and were high service users (Profile 4). Profile 1 had the best health and social conditions, while Profile 4 had the worst. The risks of being frequent emergency department users, being hospitalized or dying were highest in Profile 4, followed by Profiles 3, 2 and 1. Assertive treatment programs may be suited to Profile 4 and intensive case management programs to Profile 3. Collaborative care with higher psychosocial interventions and regularity of care may be extended to Profile 2 and interventions integrating motivational treatment to Profile 1.

A qualitative system model to describe the causes and drivers of frequent potentially avoidable presentations to the emergency department

Frequent potentially avoidable presentations to Emergency Departments (EDs) represent a complex problem, driven by multiple interdependent and interacting factors that change over time and influence one another. We sought to describe and map the drivers of frequent potentially avoidable presentations to a regional ED, servicing regional and rural areas, and identify possible solutions from the perspectives of key stakeholders. This study used a qualitative, community-based systems dynamics approach utilising Group Model Building (GMB). Data were collected from two 3-h online workshops embedded with small-group discussions and conducted with stakeholder groups operating within a regional health system. Stakeholders were guided through a series of participatory tasks to develop a causal loop diagram (CLD) using Systems Thinking in Community Knowledge Exchange software (n=29, workshop one), identify potential action points and generate a prioritised action list to intervene in the system (n=21, workshop two). Data were collected through note taking, real-time system mapping, and recording the workshops. Each action was considered against the Public Health 12 framework describing twelve leverage points to intervene in a system. A CLD illustrating the complex and interrelated factors that drive frequent potentially avoidable ED presentations was developed and classified into four categories: (1) access to services; (2) coordination; (3) patient needs; and (4) knowledge and skills. Nine action areas were identified, with many relating to care and service coordination. Most actions aligned with lower-level system impact actions. This study provides an in-depth understanding of influencing factors and potential solutions for frequent potentially avoidable ED presentations across a regional health system. The CLD demonstrates frequent potentially avoidable ED presentations are a complex problem and identified that a prevention response should engage with system- and individual-level solutions. Further work is needed to prioritise actions to support the implementation of higher-level system impacts.

Multiple emergency department encounters for acute musculoskeletal presentation with an existing mental health diagnosis

Reconceptualising acute Musculoskeletal (MSK) injuries with both stress- and tissue- based factors is required to consider prior influences of mental health disorders on acute persistent MSK pain presentations. This report describes repeated emergency presentations of an individual with acute persistent MSK pain in their twenties living with mental health. Their mental health diagnoses included depression, mood disorders, and anorexia nervosa. This person also had mental health related inpatient admissions that were not captured under the retrospective record review for a large district hospital emergency department using the Systematized Nomenclature of Medicine Clinical Terms (SNOMED CT) classification system. This case report attempts to demonstrate that improving the understanding of preexisting vulnerabilities and mental health diagnoses may assist with informing healthcare design to develop specialised care pathways for acute injury presentations within triage settings.

Sex differences in acute health service contact after release from prison in Australia: a data linkage study

OBJECTIVES

Women released from prison typically experience worse health outcomes than their male counterparts. We examined sex differences in the patterns, characteristics, and predictors of acute health service contact (AHSC) (i.e. ambulance and/or emergency department use) after release from prison.

STUDY DESIGN

Data linkage study.

METHODS

Baseline survey data from 1307 adults (21% women) within six weeks of expected release from prisons in Queensland, Australia (2008-2010) were linked prospectively with state-wide ambulance and emergency department, correctional, mental health, and death records. Crude and adjusted incidence rates and incidence rate ratios of AHSC were calculated overall and by sex. An Andersen-Gill model was fit to examine whether sex predicted AHSC. The interaction effect between sex and each model covariate was tested.

RESULTS

The crude incidence rates of AHSC after release from prison were 1.4 (95% confidence interval [CI]: 1.3-1.5) and 1·1 (95%CI: 1.1-1.2) per person-year for women and men, respectively. The relationship between perceived physical health-related functioning at the baseline and AHSC was modified by sex (P = 0·039). The relationship between perceived health-related functioning and AHSC also differed among women. Compared to women who perceived their physical health as fair or good at the baseline, women who perceived their physical health as poor were at greater risk of AHSC (hazard ratio = 2.4, 95%CI: 1.4-3·9, P = 0.001) after release from prison.

CONCLUSIONS

Among people released from prison, women's and men's AHSC differs depending on how they perceive their own physical health. The specific needs of women and men must be considered in transitional support policy and planning to improve their health outcomes.

Independent Predictors of Repeat Emergency Room Presentations: Insights from a Cohort of 1066 Consecutive Patients with Non-Cardiac Chest Pain Generating 4770 Repeat Presentations

BACKGROUND AND IMPORTANCE

Chest pain (CP) is one of the most frequent presentations to the emergency department (ED), a large proportion of which is non-cardiac chest pain (NCCP). Repeat attendances to ED are common and impose considerable burden to overstretched departments.

OBJECTIVE

Our aim was to determine drivers for repeat ED presentations using NCCP as the primary cause of index presentation.

DESIGN, SETTING AND PARTICIPANTS

This was a retrospective cohort study of 1066 consecutive presentations with NCCP to a major urban hospital ED in North England. Index of Multiple Deprivation (IMD), a postcode-derived validated index of deprivation, was computed. Charlson comorbidity index (CCI) was determined by reference to known comorbidity variables. Repeat presentation to ED to any national hospital was determined by a national linked database (population 53.5 million). Independent predictors of ED representation were computed using logistic regression analysis.

RESULTS

Median age was 43 (IQR 28-59), and 50.8% were male. Furthermore, 27.8%, 8.1% and 3.8% suffered from chronic obstructive pulmonary disease (COPD), hypertension and diabetes mellitus, respectively. The most frequent diagnoses, using ICD-10 coding, were non-cardiac chest pain (55.1%), followed by respiratory conditions (14.7%). One-year incidence of adjudicated myocardial infarction, urgent or emergency coronary revascularisation and all-cause death was 0.6%, 2% and 5.3%, respectively. There was a total of 4770 ED repeat presentations 1 year prior to or following index presentation with NCCP in this cohort. Independent (multivariate) predictors for frequent re-presentation (defined as ≥2 representations) were a history of COPD (OR [odds ratio] 2.06, p = 0.001), previous MI (OR3.6, p = 0.020) and a Charlson comorbidity index ≥1 (OR 1.51, p = 0.030). The frequency of previous MI was low as only 3% had sustained a previous MI.

CONCLUSIONS

This analysis indicates that COPD and complex health care needs (represented by high CCI), but not socio-economic deprivation, should be health policy targets for lessening repeat ED presentations. What is already known on this topic: Repeat presentations with non-ischaemic chest pain are common, placing a considerable burden on emergency departments.

WHAT THIS STUDY ADDS

COPD and complex health care needs, denoted by Charlson comorbidity index, are implicated as drivers for repeat presentation to accident and emergency department. Socio-economic deprivation was not an independent predictor of re-presentation. How might this study affect research, practice, or policy: Community-based support for COPD and complex health care needs may reduce frequency of ED attendance.

Effects of home visiting programmes on community-dwelling older adults with chronic multimorbidity: a scoping review

BACKGROUND

Chronic ultimorbidity is the most frequent and serious health problem in older adults. Home visiting programmes could be a strategy with potential benefits. However, there are no scoping reviews to date that examine the effects of home visiting programmes on community-dwelling older adults with chronic multimorbidity.

OBJECTIVE

To examine the effects of home visiting programmes on community-dwelling older adults with chronic multimorbidity.

METHODS

A scoping review was carried out following PRISMA-ScR reporting guidelines. The search was conducted in six databases (PubMed/Medline, Cochrane, CINAHL, Web of Science, Scopus and EMBASE) between October 2021 and April 2022.

RESULTS

Four RCTs with 560 patients were included. The visits were carried out by nurses, nursing students, volunteers, and other healthcare professionals. The interventions varied in the number of visits, frequency, duration of follow-up, and whether or not they were combined with other strategies such as telephone calls. Discrepancies were found in the effects of the interventions on quality of life, self-efficacy, self-rated health, and use and cost of health and social services.

CONCLUSION

This review shows that home visiting programmes could have potential benefits for older adults with chronic multimorbidity. However, its results have been inconclusive. There is a need for high quality studies involving a larger number of patients, in which home visits are the main intervention.

Epidemiology of pediatric trauma and fractures during and beyond the COVID-19 pandemic

Purpose

Previous literature has shown decreases in pediatric trauma during the COVID-19 outbreak, but few have analyzed beyond the peak of the pandemic. This study assesses the epidemiology of pediatric trauma cases in a high-volume teaching hospital in New York City before, during, and after the height of the COVID-19 pandemic.

Methods

Institutional data on pediatric trauma orthopedic cases from January 1, 2018 to November 30, 2021 were extracted. The following time frames were studied: (1) April 1-June 22 in 2018 and 2019 (pre-pandemic), (2) April 1-June 22, 2020 (peak pandemic), and (3) April 1-June 22, 2021 (post-peak pandemic). Inferential statistics were used to compare patient and trauma characteristics.

Results

Compared to the pre-pandemic cohort (n = 6770), the peak pandemic cohort (n = 828) had a greater proportion of fractures (p < 0.01) and had a significantly decreased overall traumas per week rate (p < 0.01) and fractures per week rate (p < 0.01). These decreased trauma (p < 0.01) and fracture rates (p < 0.01) persisted for the post-peak pandemic cohort (n = 2509). Spatial analysis identified zip code clusters throughout New York City with higher rates of emergency department presentation during the peak pandemic compared to pre-pandemic, and these areas aligned with lower-income neighborhoods.

Conclusion

During the peak of the pandemic, overall trauma and fracture volumes decreased, the types of prevalent injuries changed, and neighborhoods of different economic resources were variably impacted. These trends have mostly persisted for 12 months post-peak pandemic. This longitudinal analysis helps inform and improve long-term critical care and public health resource allocation for the future.

Level of evidence

Level III.

Factors associated with emergency department avoidance during the COVID-19 pandemic and alternatives sought: a cross-sectional, telephone-based survey of frequent emergency department users in Beirut, Lebanon

OBJECTIVES

To explore avoidant behaviour of frequent emergency department (ED) users, reasons behind ED avoidance and healthcare-seeking behaviours in avoiders during the COVID-19 pandemic.

DESIGN AND SETTING

Cross-sectional, telephone-based survey administered between March and August 2021 at a tertiary care centre in Beirut, Lebanon.

PARTICIPANTS

Frequent ED users (defined as patients who visited the ED at least four times during the year prior to the first COVID-19 case in Lebanon).

PRIMARY AND SECONDARY OUTCOME MEASURES

The primary outcome was ED avoidance among frequent ED users. Secondary outcomes included reasons behind ED avoidance and healthcare-seeking behaviours in avoiders.

RESULTS

The study response rate was 62.6% and 286 adult patients were included in the final analysis. Within this sample, 45% (128/286) of the patients reported avoidant behaviour. Male patients were less likely to avoid ED visits than female patients (adjusted OR (aOR), 0.53; 95% CI 0.312 to 0.887). Other independent variables associated with ED avoidance included university education (aOR, 1.76; 95% CI 1.004 to 3.084), concern about contracting COVID-19 during an ED visit (aOR, 1.31; 95% CI 1.199 to 1.435) and underlying lung disease (aOR, 3.39; 95% CI 1.134 to 10.122). The majority of the patients who experienced acute complaints and avoided the ED completely (n=56) cited fear of contracting COVID-19 as the main reason (89.3% (50/56)). Most of the ED avoiders (83.9% (47/56)) adopted alternatives for seeking acute medical care, including messaging/calling a doctor (46.4% (26/56)), visiting a clinic (25.0% (14/56)), or arranging for a home visit (17.9% (10/56)). Of the avoiders, 64.3% (36/56) believed that the alternatives did not impact the quality of care, while 30.4% (17/56) reported worse quality of care.

CONCLUSIONS

Among frequent ED users, ED avoidance during COVID-19 was common, especially among women, those with lung disease, those with university-level education and those who reported fear of contracting COVID-19 in the ED. While some patients resorted to alternative care routes, telemedicine was still underused in our setting. Developing strategies to reduce ED avoidance, especially in at-risk groups, may be warranted during pandemics.

Barriers and Best Practices for the Use of Patient-Reported Outcome Measures in Emergency Medicine

Patient-reported outcome measures are commonly used in clinical trials and have been incorporated into routine clinical care in select specialties but have not been widely implemented in emergency medicine research and clinical care. We describe measurement-related barriers to patient-reported outcome measure use in the emergency department; administrative and practical considerations; implications of developing novel emergency medicine-specific patient-reported outcome measures; and key considerations for the use of patient-reported outcome measures in emergency medicine research and clinical care. Despite the unique barriers of the ED environment, potential solutions include the use of ED-validated patient-reported outcome measures when available; adapting existing short-form, multidimensional patient-reported outcome measures previously validated in diverse populations, ideally using computer-adapted testing; and collecting responses during anticipated wait times. With this work, we aim to inform barriers and best practices to the use of patient-reported outcome measures in emergency medicine research and clinical care to support future, more widespread implementation of patient-reported outcome measures within emergency care. The successful adoption of patient-reported outcome measures for diverse ED patient populations within the unique constraints of the acute care environment may help researchers, clinicians, and policymakers improve the quality and patient-centeredness of acute care.

Factors related to the frequent use of emergency department services in Korea

BACKGROUND

Frequent Emergency Department (ED) visitors are identified by the policymakers to reduce avoidable ED visits and lessen the financial and operational burden. This study aimed to identify the factors related to the frequent use of ED services.

METHODS

This nationwide, cross-sectional observational study was conducted using information obtained from the 2019 National Emergency Department Information System (NEDIS) database. Frequent ED users were defined as patients with four or more ED visits a year. We performed multiple logistic regression analyses to verify the relationship among sociodemographic characteristics, residential characteristics, clinical characteristics, and frequency of ED visits.

RESULTS

Among 4,063,640 selected patients, 137,608 patients visited the ED four or more times a year (total number of visits = 735,502 times), which accounted for 3.4% and 12.8% of the total number of ED users and ED visits, respectively. A high ED visit frequency was associated with male sex, age < 9 or ≥ 70 years, Medical Aid (based on the insurance type), lower number of medical institutions and beds compared with that of the national average, and conditions, such as cancer, diabetes, renal failure, and mental illness. A low ED-visit frequency was associated with residence in regions vulnerable to emergency medical care and regions with high income. The possibility of frequent ED visits was high for patients with level 5 severity (non-emergent) and those with an increased need for medical treatment, including older patients and patients with cancer or mental illness. The possibility of frequent ED visits was low for patients aged > 19 years with level 1 severity (resuscitation).

CONCLUSIONS

Health service accessibility factors, including low income and medical resource imbalance, were associated with frequent ED visits. Future large-scale prospective cohort studies are warranted to establish an efficient emergency medical system.

Predictors of dropout from treatment among patients using specialized addiction treatment centers

OBJECTIVES

This study investigated the use of outpatient care, and sociodemographic and clinical characteristics of patients with substance-related disorders (SRD) to predict treatment dropout from specialized addiction treatment centers. The study also explored risks of adverse outcomes, frequent emergency department (ED) use (3+ visits/year), and death, associated with treatment dropout within the subsequent 12 months.

METHODS

The study examined a cohort of 16,179 patients who completed their last treatment episode for SRD between 2012 and 13 and 2014-15 (financial years: April 1 to March 31) in 14 specialized addiction treatment centers using Quebec (Canada) health administrative databases. We used multivariable logistic regressions to measure risk of treatment dropout (1996-96 to 2014-15), while we used survival analysis controlling for sex and age to assess the odds of frequent ED use and death in 2015-16.

RESULTS

Of the 55 % of patients reporting dropout from SRD treatment over the 3-year period, 17 % were frequent ED users, and 1 % died in the subsequent 12 months. Patients residing in the most socially deprived areas, having polysubstance-related disorders or personality disorders, and having previously dropped out from specialized addiction treatment centers had increased odds of current treatment dropout. Older patients, those with a history of homelessness, past SRD treatment, or more concurrent outpatient care outside specialized addiction treatment centers had decreased odds of treatment dropout. Patients who dropped out were subsequently at higher risk of frequent ED use and death.

CONCLUSIONS

This study highlighted that patients with more severe problems and previous dropout may need more sustained and adequate help to prevent subsequent treatment dropout. Specialized addiction treatment centers may consider enhancing their follow-up care of patients over a longer duration and better integrating their treatment with other outpatient care resources to meet the multiple needs of the more vulnerable patients using their services.

Implementation analysis of a case management intervention for people with complex care needs in primary care: a multiple case study across Canada

BACKGROUND

Case management is one of the most frequently performed interventions to mitigate the negative effects of high healthcare use on patients, primary care providers and the healthcare system. Reviews have addressed factors influencing case management interventions (CMI) implementation and reported common themes related to the case manager role and activities, collaboration with other primary care providers, CMI training and relationships with the patients. However, the heterogeneity of the settings in which CMI have been implemented may impair the transferability of the findings. Moreover, the underlying factors influencing the first steps of CMI implementation need to be further assessed. This study aimed to evaluate facilitators and barriers of the first implementation steps of a CMI by primary care nurses for people with complex care needs who frequently use healthcare services.

METHODS

A qualitative multiple case study was conducted including six primary care clinics across four provinces in Canada. In-depth interviews and focus groups with nurse case managers, health services managers, and other primary care providers were conducted. Field notes also formed part of the data. A mixed thematic analysis, deductive and inductive, was carried out.

RESULTS

Leadership of the primary care providers and managers facilitated the first steps of the of CMI implementation, as did the experience and skills of the nurse case managers and capacity development within the teams. The time required to establish CMI was a barrier at the beginning of the CMI implementation. Most nurse case managers expressed apprehension about developing an "individualized services plan" with multiple health professionals and the patient. Clinic team meetings and a nurse case managers community of practice created opportunities to address primary care providers' concerns. Participants generally perceived the CMI as a comprehensive, adaptable, and organized approach to care, providing more resources and support for patients and better coordination in primary care.

CONCLUSION

Results of this study will be useful for decision makers, care providers, patients and researchers who are considering the implementation of CMI in primary care. Providing knowledge about first steps of CMI implementation will also help inform policies and best practices.

Appropriateness of frequent use of emergency departments: A retrospective analysis in Rome, Italy

Background

Frequent users (FUs) are patients who repeatedly and inappropriately visit the emergency department (ED) for low-grade symptoms that could be treated outside the hospital setting. This study aimed to investigate the phenomenon of the FU in Rome by profiling such users and analyzing ED attendance by FUs.

Methods

The analysis was carried out for attendance in 2021 at 15 EDs in the Local Health Authority Roma 1 geographical area. A digital app collected data, including information on the following variables: number of attendance, demographic characteristics, emergency medical service (EMS) usage, triage code, and appropriateness of attendance. COVID-19 diagnosis was also studied to analyze any possible influence on ED attendance. Differences between FUs and non-FUs were investigated statistically by t-test and chi-square test. Univariate analysis and multivariable logistic regression were performed to analyze the associated factors.

Results

A total of 122,762 ED attendance and 89,036 users were registered. The FU category represented 2.9% of all users, comprising 11.9% of total ED attendance. There was a three times higher frequency of non-urgent codes in attendance of FU patients (FU: 9.7%; non-FU: 3.2%). FUs were slightly more likely to have used the EMS (13.6% vs. 11.4%) and had a lower frequency of appropriate ED attendance (23.8% vs. 27.0%). Multivariate logistic analysis confirmed a significant effect of triage code, gender, age, EMS usage, and COVID-19 diagnosis for the appropriateness of attendance. The results were statistically significant (p &lt; 0.001).

Conclusion

The FU profile describes mostly non-urgent and inappropriate attendance at the ED, including during the COVID-19 pandemic. This study represents an important tool for strengthening preventive policies outside the hospital setting. The Italian National Recovery and Resilience Plan represents an excellent opportunity for the development of new strategies to mitigate the phenomenon of FUs.

Machine learning to improve frequent emergency department use prediction: a retrospective cohort study

Frequent emergency department use is associated with many adverse events, such as increased risk for hospitalization and mortality. Frequent users have complex needs and associated factors are commonly evaluated using logistic regression. However, other machine learning models, especially those exploiting the potential of large databases, have been less explored. This study aims at comparing the performance of logistic regression to four machine learning models for predicting frequent emergency department use in an adult population with chronic diseases, in the province of Quebec (Canada). This is a retrospective population-based study using medical and administrative databases from the Régie de l'assurance maladie du Québec. Two definitions were used for frequent emergency department use (outcome to predict): having at least three and five visits during a year period. Independent variables included sociodemographic characteristics, healthcare service use, and chronic diseases. We compared the performance of logistic regression with gradient boosting machine, naïve Bayes, neural networks, and random forests (binary and continuous outcome) using Area under the ROC curve, sensibility, specificity, positive predictive value, and negative predictive value. Out of 451,775 ED users, 43,151 (9.5%) and 13,676 (3.0%) were frequent users with at least three and five visits per year, respectively. Random forests with a binary outcome had the lowest performances (ROC curve: 53.8 [95% confidence interval 53.5-54.0] and 51.4 [95% confidence interval 51.1-51.8] for frequent users 3 and 5, respectively) while the other models had superior and overall similar performance. The most important variable in prediction was the number of emergency department visits in the previous year. No model outperformed the others. Innovations in algorithms may slightly refine current predictions, but access to other variables may be more helpful in the case of frequent emergency department use prediction.

Profiles of quality of outpatient care use, associated sociodemographic and clinical characteristics, and adverse outcomes among patients with substance-related disorders

BACKGROUND

This study identified patient profiles in terms of their quality of outpatient care use, associated sociodemographic and clinical characteristics, and adverse outcomes based on frequent emergency department (ED) use, hospitalization, and death from medical causes.

METHODS

A cohort of 18,215 patients with substance-related disorders (SRD) recruited in addiction treatment centers was investigated using Quebec (Canada) health administrative databases. A latent class analysis was produced, identifying three profiles of quality of outpatient care use, while multinomial and logistic regressions tested associations with patient characteristics and adverse outcomes, respectively.

RESULTS

Profile 1 patients (47% of the sample), labeled "Low outpatient service users", received low quality of care. They were mainly younger, materially and socially deprived men, some with a criminal history. They had more recent SRD, mainly polysubstance, and less mental disorders (MD) and chronic physical illnesses than other Profiles. Profile 2 patients (36%), labeled "Moderate outpatient service users", received high continuity and intensity of care by general practitioners (GP), while the diversity and regularity in their overall quality of outpatient service was moderate. Compared with Profile 1, they  were older, less likely to be unemployed or to live in semi-urban areas, and most had common MD and chronic physical illnesses. Profile 3 patients (17%), labeled "High outpatient service users", received more intensive psychiatric care and higher quality of outpatient care than other Profiles. Most Profile 3 patients lived alone or were single parents, and fewer lived in rural areas or had a history of homelessness, versus Profile 1 patients. They were strongly affected by MD, mostly serious MD and personality disorders. Compared with Profile 1, Profile 3 had more frequent ED use and hospitalizations, followed by Profile 2. No differences in death rates emerged among the profiles.

CONCLUSIONS

Frequent ED use and hospitalization were strongly related to patient clinical and sociodemographic profiles, and the quality of outpatient services received to the severity of their conditions. Outreach strategies more responsive to patient needs may include motivational interventions and prevention of risky behaviors for Profile 1 patients, collaborative GP-psychiatrist care for Profile 2 patients, and GP care and intensive specialized treatment for Profile 3 patients.

Childhood adversities and risk of posttraumatic stress disorder and major depression following a motor vehicle collision in adulthood

AIMS

Childhood adversities (CAs) predict heightened risks of posttraumatic stress disorder (PTSD) and major depressive episode (MDE) among people exposed to adult traumatic events. Identifying which CAs put individuals at greatest risk for these adverse posttraumatic neuropsychiatric sequelae (APNS) is important for targeting prevention interventions.

METHODS

Data came from n = 999 patients ages 18-75 presenting to 29 U.S. emergency departments after a motor vehicle collision (MVC) and followed for 3 months, the amount of time traditionally used to define chronic PTSD, in the Advancing Understanding of Recovery After Trauma (AURORA) study. Six CA types were self-reported at baseline: physical abuse, sexual abuse, emotional abuse, physical neglect, emotional neglect and bullying. Both dichotomous measures of ever experiencing each CA type and numeric measures of exposure frequency were included in the analysis. Risk ratios (RRs) of these CA measures as well as complex interactions among these measures were examined as predictors of APNS 3 months post-MVC. APNS was defined as meeting self-reported criteria for either PTSD based on the PTSD Checklist for DSM-5 and/or MDE based on the PROMIS Depression Short-Form 8b. We controlled for pre-MVC lifetime histories of PTSD and MDE. We also examined mediating effects through peritraumatic symptoms assessed in the emergency department and PTSD and MDE assessed in 2-week and 8-week follow-up surveys. Analyses were carried out with robust Poisson regression models.

RESULTS

Most participants (90.9%) reported at least rarely having experienced some CA. Ever experiencing each CA other than emotional neglect was univariably associated with 3-month APNS (RRs = 1.31-1.60). Each CA frequency was also univariably associated with 3-month APNS (RRs = 1.65-2.45). In multivariable models, joint associations of CAs with 3-month APNS were additive, with frequency of emotional abuse (RR = 2.03; 95% CI = 1.43-2.87) and bullying (RR = 1.44; 95% CI = 0.99-2.10) being the strongest predictors. Control variable analyses found that these associations were largely explained by pre-MVC histories of PTSD and MDE.

CONCLUSIONS

Although individuals who experience frequent emotional abuse and bullying in childhood have a heightened risk of experiencing APNS after an adult MVC, these associations are largely mediated by prior histories of PTSD and MDE.

Association between sustained opioid prescription and frequent emergency department use: a cohort study

BACKGROUND

Chronic non-cancer pain (CNCP) is common among frequent emergency department (ED) users, although factors underlying this association are unclear. This study estimated the association between sustained opioid use and frequent ED use among patients with CNCP.

METHODS

Retrospective cohort study using a Canadian provincial health insurer database (Régie d'Assurance Maladie du Québec). The database included adults with both ≥1 chronic condition and ≥ 1 ED visit in 2012 or 2013. Inclusion in the study further required a CNCP diagnosis, public drug insurance coverage and 1-year survival after the first ED visit in 2012 or 2013 (index visit). Multivariable logistic regression was used to derive ORs of frequent ED use (≥5 visits in the year following the index visit) subsequent to sustained opioid use (≥60 days opioids prescription within 90 days preceding the index visit), adjusting for important covariables.

RESULTS

From 576 688 patients in the database, 58 237 were included in the study. Of these, 4109 (7.1%) had received a sustained opioid prescription and 4735 (8.1%) were frequent ED users in the follow-up year. Sustained opioid use was not associated with frequent ED use in the multivariable model (OR: 1.06, 95% CI 0.94 to 1.19). Novel associated covariables were benzodiazepine prescription (OR: 1.21, 95% CI 1.12 to 1.30) and polypharmacy (OR: 1.23, 95% CI 1.13 to 1.34).

CONCLUSIONS

Due to confounding by social and medical vulnerability, patients with CNCP with sustained opioid use appear to have a higher propensity for frequent ED use in unadjusted models. However, sustained opioid use was not associated with frequent ED use in these patients after adjustment.

Disability and Emergency Department Visits: A Path Analysis of the Mediating Effects of Unmet Healthcare Needs and Chronic Diseases

Previous studies identified disabilities and unmet healthcare needs, especially those related to primary healthcare, as predictors of ED use. This study examined the relationship between disability, unmet healthcare needs, chronic diseases, and ED visits in South Korea. This study was a cross-sectional study using the Korean Health Panel Survey collected in 2018. A path analysis was used. Our research found a significant association between disability and ED visits mediated by unmet healthcare needs and chronic diseases. Disability had a significant direct effect on unmet healthcare needs (β = .04, P ≤ .001) and chronic diseases (β = .10, P ≤ .001). However, there was no mediating effect of unmet healthcare needs between disability and ED visits. While barriers to access to care among people with disabilities are widely acknowledged, this study suggests that interventions or programs to reduce ED visits should consider the unique healthcare needs of people with disabilities.

Predictors of Length of Hospitalization and Impact on Early Readmission for Mental Disorders

Length of hospitalization, if inappropriate to patient needs, may be associated with early readmission, reflecting sub-optimal hospital treatment, and translating difficulties to access outpatient care after discharge. This study identified predictors of brief-stay (1-6 days), mid-stay (7-30 days) or long-stay (≥31 days) hospitalization, and evaluated how lengths of hospital stay impacted on early readmission (within 30 days) among 3729 patients with mental disorders (MD) or substance-related disorders (SRD). This five-year cohort study used medical administrative databases and multinomial logistic regression. Compared to patients with brief-stay or mid-stay hospitalization, more long-stay patients were 65+ years old, had serious MD, and had a usual psychiatrist rather than a general practitioner (GP). Predictors of early readmission were brief-stay hospitalization, residence in more materially deprived areas, more diagnoses of MD/SRD or chronic physical illnesses, and having a usual psychiatrist with or without a GP. Patients with long-stay hospitalization (≥31 days) and early readmission had more complex conditions, especially more co-occurring chronic physical illnesses, and more serious MD, while they tended to have a usual psychiatrist with or without a GP. For patients with more complex conditions, programs such as assertive community treatment, intensive case management or home treatment would be advisable, particularly for those living in materially deprived areas.

Social and structural determinants of emergency department use among Arab and Jewish patients in Jerusalem

Background

A growing body of research demonstrates that economic conditions and racial and ethnic disparities result in excessive overuse of emergency departments (EDs) by a small group of socioeconomically marginalized residents. Knowledge and understanding of these issues on the part of the healthcare team can promote equality by providing structurally competent care. This study aims to identify the major social and structural factors related to patterns of ED visits by Arab and Jewish patients in Israel, where access to health services is covered by universal national health insurance.

Methods

A cross-sectional study was conducted using questionnaires of ED patients in a tertiary care medical center in Jerusalem. The hospital is the largest of the three EDs in Jerusalem with over 90,000 adult patient visits a year. The sample was stratified by ethnicity, including 257 Jewish patients and 170 Arab patients. The outcome variable was repeat visits for the same reason to the ED within 30 days.

Results

There were differences between Jewish and Arab patients’ social and structural characteristics, including health status, socioeconomic status, feeling of safety, and social support. There were also significant differences in some of the characteristics of health service utilization patterns, including ED repeat visits, language barriers when seeking healthcare in the community, and seeking information about medical rights. The variables associated with repeat visits were different between the two groups: among the Arab patients, repeat visits to the ED were associated with concerns about personal safety, whereas among the Jewish patients, they were associated with poverty.

Conclusion

The study illustrates the gaps that exist between the Arab and Jewish population in Israel. The findings demonstrated significant differences between populations in both health status and access to health services. In addition, an association was found in each ethnic group between different structural factors and repeat ED requests. This study supports previous theories and findings of the relationship between structural and social factors and patterns of health services utilization.

Frequency and patient attributes associated with emergency department visits after discharge: Retrospective cohort study

BACKGROUND

The utilization of emergency department (ED) during the post-discharge period may provide relevant insights to reduce fragmentation of care, particularly in a context of general intense use. We aimed to describe frequency and patient attributes associated with emergency department (ED) visits within 30 days of inpatient discharge in a Portuguese health region-Algarve.

METHODS

Secondary data on inpatient and emergency care, for adult patients discharged in 2016. To analyse the association between outcome-ED visit within 30 days of discharge-and selected variables (admission type and groups of or individual illnesses/conditions), we used age- and sex-adjusted odds ratios (aOR). We included all adult patients (aged ≥18 years) discharged during 2016 from the region's public hospital inpatient departments. The period for ED visits also included January 2017.

RESULTS

For 21,744 adults discharged in 2016 (mean age: 58 years; 60% female), 23 percent visited ED at least once within 30 days of discharge. Seventy-five percent of those visits were triaged with high clinical priority. Patients with more comorbidities or specific groups of illnesses/conditions had a significant increased risk of returning ED (aOR and 95% confidence intervals-endocrine: 1.566; 1.256-1.951; mental illness: 1.421; 1.180-1.713; respiratory: 1.308; 1.136-1.505).

CONCLUSION

Patients returned ED after inpatient discharge frequently and for severe reasons. Patients with more comorbidities or specific groups of illnesses/conditions (endocrine, mental illness or respiratory) had an increased risk of returning ED, so these groups may be prioritized in further research and health system initiatives to improve care before and after discharge.

Profiles of frequent emergency department users with chronic conditions: a latent class analysis

OBJECTIVES

Frequent emergency department users represent a small proportion of users while cumulating many visits. Previously identified factors of frequent use include high physical comorbidity, mental health disorders, poor socioeconomic status and substance abuse. However, frequent users do not necessarily exhibit all these characteristics and they constitute a heterogeneous population. This study aims to establish profiles of frequent emergency department users in an adult population with chronic conditions.

DESIGN

This is a retrospective cohort study using administrative databases.

SETTING

All adults who visited the emergency department between 2012 and 2013 (index date) in the province of Quebec (Canada), diagnosed with at least one chronic condition, and without dementia were included. Patients living in remote areas and who died in the year following their index date were excluded. We used latent class analysis, a probability-based model to establish profiles of frequent emergency department users. Frequent use was defined as having five visits or more during 1 year. Patient characteristics included sociodemographic characteristics, physical and mental comorbidities and prior healthcare utilisation.

RESULTS

Out of 4 51 775 patients who visited emergency departments at least once in 2012-2013, 13 676 (3.03%) were frequent users. Four groups were identified: (1) 'low morbidity' (n=5501, 40.2%), (2) 'high physical comorbidity' (n=3202, 23.4%), (3) 'injury or chronic non-cancer pain' (n=2313, 19.5%) and (4) 'mental health or alcohol/substance abuse' (n=2660, 16.9%).

CONCLUSIONS

The four profiles have distinct medical and socioeconomic characteristics. These profiles provide useful information for developing tailored interventions that would address the specific needs of each type of frequent emergency department users.

Where Have All the FLOWERS Gone? A Multicenter Investigation of Frequent Users of Midwest Emergency Department Services During the COVID-19 Stay-at-home Orders

Introduction: In this study we aimed to determine the impact of the mandatory coronavirus disease 2019 (COVID-19) pandemic stay-at-home order on the proportional makeup of emergency department (ED) visits by frequent users and super users. Methods: We conducted a secondary analysis of existing data using a multisite review of the medical records of 280,053 patients to measure the impact of the COVID-19 pandemic stay-at-home order on ED visits. The primary outcomes included analysis before and during the lockdown in determining ED use and unique characteristics of non-frequent, frequent, and super users of emergency services. Results: During the mandatory COVID-19 stay-at-home order (lockdown), the percentage of frequent users increased from 7.8% (pre-lockdown) to 21.8%. Super users increased from 0.7% to 4.7%, while non-frequent users dropped from 91.5% to 73.4%. Frequent users comprised 23.7% of all visits (4% increase), while super user encounters (4.7%) increased by 53%. Patients who used Medicaid and Medicare increased by 39.3% and 4.6%, respectively, while those who were uninsured increased ED use by 190.3% during the lockdown. Conclusion: When barriers to accessing healthcare are implemented as part of a broader measure to reduce the spread of an infectious agent, individuals reliant on these services are more likely to seek out the ED for their medical needs. Policymakers considering future pandemic planning should consider this finding to ensure that vital healthcare resources are allocated appropriately.

Comprehensive geriatric assessment of older patients and associated factors of admission to Emergency Departments in pre-covid 19 Era - A Portuguese study

OBJECTIVES

Identifying frequent users' (≥3admissions/year) associated factors in an emergency department (ED), using a comprehensive geriatric assessment (CGA), describing the characteristics of patients over 65 years of age.

METHODS

A cross-sectional study was performed between August 2017 and June 2018 in an ED in Lisbon, Portugal. CGA was applied and completed with clinical records. Clinical, functional, mental and social scores were created based in Portuguese Society of Internal Medicine, and a statistical model was developed.

RESULTS

CGA was applied to 426 patients over 64 years old in an ED. The mean age was 79.3, 84.7% had multimorbidity. 51.2%, 75.6%, and 40% had dependence on basic, instrumental, and walking activities, respectively. 52% had depressive symptoms, 65.7% had cognitive impairment, 63% were undernourished/at risk for malnutrition. 33.1% were socially at risk. Polypharmacy was present with a use on average of 6.5 drugs daily. Social, clinical, functional, and mental scores were unfavourable in 48.6%, 79.6%, 54.9% and 83.1% of the population, respectively. There were 2.7 hospital admissions/year and 39.9% were frequent ED users (≥3/year). The logistic regression model was weak, but showed that patients with polypharmacy, elevated Charlson Comorbidity index and an impairment nutritional status presented higher risk of being frequent users.

CONCLUSIONS

This study showed that 97.1% of patients had needs that would justify an interventional care plan. This intervention should be extended to primary care and nursing homes. While not providing a robust model, our study has indicated nutritional problems, polypharmacy, and an elevated Charlson index as the features with more weight in frequent users' admissions.