A Study on the Change of Emergency Department Use Behavior of the Homeless Patients after the Implementation of the ‘Seoul Type Citizen Sympathy Emergency Room Project’

PURPOSE: This study shows the change in emergency room use behavior by homeless patients after implementation of the ‘Seoul Type Citizen Sympathy Emergency Room Project’ in July 2015. METHODS: A retrospective study was conducted in a public hospital between January 2014 and December 2014 and January 2016 and December 2016. Homeless patients who visited the emergency room in 2014 and 2016 were compared based on age, gender, mode of insurance, admission, revisit within 48 hours, length of stay (LOS) in the emergency department (ED), total cost, and major diagnostic category. RESULTS: A total of 3,642 homeless patients were enrolled during the study period, of which 1,876 visited in 2014 and 1,766 in 2016. Fewer homeless patients in 2016 revisited within 48 hours (p=0.046). Homeless in 2016 had a shorter ED LOS (p < 0.001) and lower total cost (p=0.040). More homeless patients who visited due to alcohol revisited within 48 hours in 2016 (p=0.036). Moreover, these patients did not have a different ED LOS (p=0.060) or total cost (p=0.475). Medicaid homeless patients were less connected compared health insurance by screening, brief intervention, referral to treatment program. CONCLUSION: Comparison of homeless patients who visited the emergency room in 2014 and 2016 revealed fewer total homeless patients in 2016, as well as less revisits within 48 hours, shorter ED LOS and lower total cost. These findings indicate that the ‘Seoul Type Citizen Sympathy Emergency Room Project’ was effective in the emergency room, but improvements for alcohol and medicaid homeless patients are needed.

Analysis of Delayed Arrival Time According to the Residences Type of Elderly Acute Ischemic Stroke Patients

PURPOSE: We made a clinical comparison of elderly patients from home and residential aged care facilities (RACFs) who visited the emergency department and were hospitalized with acute ischemic stroke. In addition, we investigated the factors associated with prehospital delay in acute ischemic stroke. METHODS: A retrospective study was conducted in a public hospital between January 2013 and December 2016. Information regarding the patients was registered including gender, age, comorbidities, symptoms at onset, use of emergency medical services, National Institute of Health Stroke Scale (NIHSS) at the emergency department, symptom-to-door time, etc. Characteristics of the patients were analyzed and logistic regression analysis was conducted to identify factors associated with symptom-to-door time. RESULTS: A total of 402 patients were enrolled during the study period. Overall, 339 elderly patients visited from home and 63 patients from RACFs, and patients from home were divided into two groups, living with family (n=274) and living alone (n=65). Patients from RACFs were older (≤0.001) and had higher NIHSS (p=0.007) than patients from home, but there were no significant relationships between symptom-to-door time and age (p=0.525), NIHSS (p=0.428). There was no difference in symptom-to-door time between patients living with family and patients from RACFs, but patients living alone had delayed symptom-to-door time (p < 0.001). CONCLUSION: Elderly patients living alone were among the three groups that had the most delayed symptom-to-door time. Therefore, it is necessary to expand and supplement support for elderly patients living alone, as well as to improve education regarding acute ischemic stroke.

Ambient Particulate Matter and Emergency Department Visit for Chronic Obstructive Pulmonary Disease

PURPOSE: This study aimed to explore the association between increased level of ambient particulate matter and emergency room visits for chronic obstructive pulmonary disease (COPD) exacerbations. METHODS: A retrospective study was conducted. We enrolled patients who lived in Seoul, Korea and were diagnosed with COPD in the emergency room between January 2012 and December 2014. Meteorological factors [daily highest temperature, lowest temperature, mean temperature, diurnal temperature, rainfall, relative humidity, amount of sunshine and particulate matter less than 10 µm (PM 10)] between December 2011 and December 2014 in Seoul were acquired from the Korea Meteorological Administration. We used a multiple Poisson regression model with daily patient's number of COPD as a response variable and meteorological factors as explanatory variable. Variable selection was done via an Elastic net. RESULTS: There was a total of 1,179 emergency visits for acute exacerbations of COPD patients. PM10 (before 4, 10, 11, 15, 16, 17, 22, 24, 27, 28 day), rainfall (before 1, 6, 8, 16, 18 day), relative humidity (before 2, 8), and daily temperature difference (5, 10, 15 day) had a relationship and a lag effect with COPD exacerbations. CONCLUSION: This study showed that an increased concentration of PM10 was associated with COPD exacerbations. A future study that reinforces the limitation of this study is necessary to get a helpful index for an adequate response of medical institution and efficient placement of medical personnel.

Analysis of Epidemiologic Characteristics between Patients Visited from Residential Aged Care Facilities and Elderly Patients Visited from Home Admitted to the Emergency Department with Disease

PURPOSE: In recent years, the number of elderly patients visiting from residential aged care facilities (RACFs) has been increasing. We analyzed a comparison of characteristics between patients who visited the ER with diseases from RACFs and those who visited from home. METHODS: A retrospective study was conducted in a public hospital between January 2013 and December 2014. The subjects included patients who visited the ED from RACFs and elderly patients who visited the ED from home. Comparisons of the following parameters were made between the two groups: gender, age, mode of insurance, mode of ED visit, mobile status, Charlson comorbidity index (CCI), chief complaint, final results in the ED, and length of stay (LOS) in the ED and hospital. RESULTS: A total of 7,603 patients were enrolled during the study period. There were 6,401 elderly patients who visited from home and 1,202 patients who visited from RACFs. Patients from RACFs were older than those from home (79.90±8.01 vs. 75.78±7.26, p<0.001). More patients from RACFs were on Medicaid (56.6% vs. 27.9%, p<0.001), took more ambulance (86.3% vs. 49.4%, p<0.001), more bedridden (68.2% vs. 6.4%, p<0.001), and higher CCI (2.38±1.99 vs. 1.45±1.84, p<0.001). Compared with patients from home, those from RACFs showed a significantly higher proportion of admission (63.2% vs. 32.9%, p<0.001), ED LOS (403.03±361.77 vs. 277.07±258.82, p<0.001), and hospital LOS (19.65±18.58 vs. 15.67±15.63, p<0.001). Patients from RACFs showed especially longer ED LOS from discharged ED than those from home (388.87±422.88 vs. 221.90±215.30, p<0.001). CONCLUSION: Compared with elderly patients from home, patients from RACFs also had higher admission rate and longer ED LOS, as well as hospital LOS. Patients from RACFs had long ED LOS. The findings in this study suggest that there could be ED overcrowding in the near future.

The Relationship between the Number of Community Acquired Pneumonia Patients and the Weather among the Patients Who Visit ER: A Poisson Regression with Variable Selection Via Elastic net

PURPOSE: This study shows the relationship between meteorological factors and the number of community acquired pneumonia (CAP) patients in the emergency room and lag effect of meteorological factors affecting CAP. METHODS: A retrospective study was conducted. Patients diagnosed with CAP in the emergency room between January 2012 and December 2014 were enrolled. The patients were over 18 years old and lived in Seoul, Korea. Meteorological factors (highest daily temperature, lowest temperature, mean temperature, diurnal temperature, rainfall, relative humidity, amount of sunshine, and powdery dust under 10 microg/m3 (PM10)) between December 2011 and December 2014 in Seoul were acquired from the Korea Meteorological Administration. Multiple Poisson regression (Generalized Linear Model) was used with daily patient's number of CAP as the response variable and meteorological factors as the explanatory variable. Variable selection was performed via Elastic net. RESULTS: A total of 568 CAP patients were checked. Highest temperature (before 6 days), rainfall (before 1 day), relative humidity (before 20, 15, 13, 6, 2, and 1 days), and PM10 (before 27, 24, 17, and 13 days) showed relationship and lag effect with the incidence of CAP. CONCLUSION: This study showed that meteorological factors (highest temperature, rainfall, relative humidity, and PM10) had relationship and lag effect with the incidence of CAP. We can make a prediction model with health weather index for prevention of CAP and redistribution of medical facilities and resources.

Serum Procalcitonin and C-reactive Protein Level as an Early Diagnostic Marker of Bacterial Meningitis in the Emergency Department

PURPOSE: Immediate identification of bacterial meningitis (BM) is essential in the emergency department. However, diagnosis of BM from analysis of cerebrospinal fluid has low sensitivity. The goal of this study was to determine the ability of serum procalcitonin (PCT) and C-reactive protein (CRP) for differentiation between BM and non-BM in adult patients. METHODS: This retrospective cohort study, which was conducted from Jan 1 2008 to Sep 30 2011, included patients with a diagnosis of meningitis based on compatible clinical features and cerebrospinal fluid (CSF) culture findings with a CSF leukocyte count > 5 /microL. Measurement of Serum PCT and CRP level was performed on initial admission to the emergency department. Patients were divided into two groups, according to the type of meningitis: BM or non-BM. Clinical features, laboratory results, including CSF results, serum PCT, and CRP levels were assessed. RESULTS: A total of 63 patients (age, 49+/-19) with confirmed meningitis were admitted: 43 patients with non-BM and 20 patients with BM. Significantly higher PCT and CRP levels, CSF white blood cell and neutrophil count, CSF glucose, and protein levels were observed in the BM group. The most highly discriminative parameters for differential diagnosis of BM proved to be serum PCT, with a sensitivity of 90%, a specificity of 100%, a positive predictive value of 100%, a negative predictive value of 96% at a diagnostic cut-off level of 1.0 ng/mL (area under the curve 0.98; 95% confidence interval 0.00-1.00) and CRP, with a sensitivity of 85%, a specificity of 88%, a positive predictive value of 77%, a negative predictive value of 93% at a diagnostic cut-off level of 6.0 mg/dL (area under the curve 0.91; 95% confidence interval 0.76-0.97). CONCLUSION: Serum PCT and CRP levels appear to be the most highly discriminative parameters for differential diagnosis of BM and non-BM.

The Usefulness of a Triage Kit for Detecting Abused Drugs / 대한구급학회지

BACKGROUND: The recovery and outcome of intoxicated patients depends on the kind of drugs they took and the total time of their initial management. The purpose of this study is to evaluate the usefulness of a Triage drug kit for detecting abused drugs. METHODS: From 2003 Feb. to 2003 July, we studied the patients who visited the emergency department with suspicious drug intoxication. In this case, we used a Triage drug kit for 134 patients with drug intoxication or who were clinically suspected of taking illegal drugs, with 30 of the patients initially admitting the substance they had used. The kit is an immunoassay kit for qualitative testing drug metabolites in urine. To compare with those cases of the preceding year, we studied 104 patients with drug intoxication that was detected between February 2002 and July 2002. RESULTS: Overall, 60% of the 30 cases who did not know what substance they abused and tested positive for, and 33% of the 27 cases with suspected intoxication confirmed their substance abuse. The positive rate for benzodiazepine use was the highest (46.7%), and there were no positive results regarding amphetamine, methamphetamine or cocaine. An appropriate antidote was administered significantly more frequently in the group for which we used the kit. CONCLUSIONS: A Triage drug kit is probably useful for diagnosing acute drug intoxication and for identifying the causative substance. However, the time required to decide whether or not a patient should be admitted is not reduced. If the kit can detect the frequently abused drugs in Korea, it will be helpful for treating drug intoxicated patients.