Urban Emergency Medical Services Research Articles

Geographical Distribution of Emergency Services Times in Traffic Accidents in Extremadura

Objective: To analyze the response time and transport time taken by the emergency medical services (EMS), considering their urban or rural location, to attend traffic accident casualties that occurred in the different geographical areas of Extremadura (Spain) from 2012 to 2015. Methods: This was a cross-sectional study of the data recorded by the Emergency Response Coordination Center 112 (ERCC-112) from traffic accidents attended by EMS. Response time was defined as the time elapsed from the request-for-care receipt until arrival of the EMS at the accident scene, and transport time as that from leaving the scene until arrival to the referral hospital. Rural EMS were those based in locations where there is no hospital, and urban EMS those located in towns or cities with a hospital. Results: During the 4-year period studied, 5,572 traffic accidents requested assistance through the ERCC-112. From the 2,875 accidents (51.9%) in which EMS were mobilized, 55.4% occurred in urban roads and the remaining in interurban ones. A total of 113 people (mean age 48.4 ± 19.0 years, range 15–84 years) died at the accident scene or before arrival to the hospital, 88.5% of them in interurban accidents. The average response time of urban and rural EMS was 10.7 ± 7.3 and 18.0 ± 12.6 min (p < 0.001), respectively, and the average transport time was 13.2 ± 11.7 and 45.2 ± 25.0 min (p = 0.009). Response time was longer than the 30-min optimum only in the most peripheral areas of Extremadura, while transport time exceeded the optimum of 90 min in the eastern regions of two health areas (Cáceres and Don Benito-Villanueva). 19.1% of the victims attended by rural EMS were classified as having a serious prognosis or as having died, as compared with 11.2% (p = 0.048) of those attended by urban EMS. Conclusions: The geographical location of EMS in Extremadura (Spain) guarantees adequate response times in traffic accidents, both in rural and urban areas. However, recommended transport times were occasionally exceeded in the most peripheral areas, due to hospital location.

Penetrating Injury from Interpersonal Violence and Related Haemorrhagic Shock Resuscitation Practices in An Urban South African Emergency Medical Service

Introduction Physical injury is a major cause of premature death and/or disability worldwide. South African mortality statistics indicate approximately half of all injury-related deaths were intentional, often from sharp-force injuries. Injury surveillance data for victims of penetrating injury is scarce in low- to middle-income countries with a reliance on mortality data. The aim was to provide an epidemiological description of penetrating injury and the related haemorrhagic shock resuscitation practice in a South African emergency medical service. Methods A prospective, observational, descriptive study was conducted in urban Cape Town. ‘R’ statistical computing was used. Emergency care providers voluntarily documented parameters for mechanism of injury, vital signs, intravenous fluid resuscitation and demographic information for patients with penetrating injury. Results Of 2884 (N) penetrating trauma cases, 143 (n) cases were sampled from providers. The chest (35.7%) and upper-limbs (31.5%) were the most common anatomy for penetrating injuries. The estimated mean crystalloid fluid volume administered for penetrating abdominal and chest injuries was 1010.6 mL and 925.3 mL respectively. A statistically significant association was observed between fluid administration and clinical indications such as systolic and diastolic blood pressure, heart rate, capillary refill time, level of consciousness estimation from the scene of the incident to the hospital after intravenous fluid administration. Most emergency medical service call outs (56%) were likely to occur between 20:00 and 02:00. Conclusion The intravenous fluid management by pre-hospital emergency care providers for patients with penetrating traumatic injuries, do not cohere with hypotensive resuscitative recommendations. Future research must include clinical practice guideline implementation efficacy and pre-hospital surveillance mechanisms. This study informs hospital clinician expectations for penetrating trauma care by pre-hospital providers.

Nontransported Cases after Emergency Medical Service Callout in the Rural and Urban Areas of the Riyadh Region.

Background:Callouts resulting in patient nontransportation can impact the overall quality of prehospital Emergency Medical Service (EMS), as resources in health care are finite. While some studies have investigated the causes of nontransportation, few have examined whether there are differences between urban and rural patients. Similarly, there has been limited research focused on rural EMS in locations such as the Middle East.Objectives:This study investigated EMS cases that resulted in nontransportation in the urban and rural areas of the Riyadh region in the Kingdom of Saudi Arabia.Methods:A cross-sectional study of 800 (400 rural and 400 urban) patient records was undertaken, using 12 months (January 1 to December 31, 2017) of data from the Saudi Red Crescent EMS. A random sampling method was used to select ambulance records from the 78 urban and rural EMS stations in the Riyadh region, with demographic data and reasons for patient nontransport analyzed comparatively.Results:A total of 310 cases were nontransported (39%) (rural: 146; urban = 164). The highest rates of nontransportation cases were of medical and trauma callouts (44.6% and 39.6%, respectively), which was consistent in both areas. The most common reason for nontransportation in both urban and rural areas was refusal of treatment and transportation (66.5% and 59.9%, respectively). Further, 10 patients were treated on-scene and released by rural EMS, while no urban patients were treated and released. Overall, the case presentations of nontransported patients did not differ significantly between both areas, and it was found that gender, age, and geographic location were not predictors for nontransportation.Conclusions:The high rate of nontransportation, particularly in medical and trauma callouts, indicates that a review of current EMS protocols may be required, along with consideration of relevant community education programs.

A dynamic dispatching problem to allocate relief vehicles after a disaster

This article proposes a deterministic model for a post-disaster scenario in an urban emergency medical services system to allocate the emergency vehicles to the patients and transfer them to the hospital. To solve the model, an exact approach called the -constraint method is applied to the problem. Since this problem belongs to the class of NP-hard problems, two metaheuristic algorithms, namely the non-dominated sorting genetic algorithm-II (NSGA-II) and the multi-objective imperialist competitive algorithm (MOICA), are applied to large-scale problems. The performance of the algorithms is evaluated using computational experiments. Finally, the model is applied in a real-life case study for an expected earthquake in Iran and several managerial insights are extracted.

Impact of COVID-19 Pandemic on Drug Overdoses in Indianapolis

We described the change in drug overdoses during the COVID-19 pandemic in one urban emergency medical services (EMS) system. Data was collected from Marion County, Indiana (Indianapolis), including EMS calls for service (CFS) for suspected overdose, CFS in which naloxone was administered, and fatal overdose data from the County Coroner’s Office. With two sample t tests and ARIMA time series forecasting, we showed changes in the daily rates of calls (all EMS CFS, overdose CFS, and CFS in which naloxone was administered) before and after the stay-at-home order in Indianapolis. We further showed differences in the weekly rate of overdose deaths. Overdose CFS and EMS naloxone administration showed an increase with the social isolation of the Indiana stay-at-home order, but a continued increase after the stay-at-home order was terminated. Despite a mild 4% increase in all EMS CFS, overdose CFS increased 43% and CFS with naloxone administration increased 61% after the stay-at-home order. Deaths from drug overdoses increased by 47%. There was no change in distribution of age, race/ethnicity, or zip code of those who overdosed after the stay-at-home order was issued. We hope this data informs policy-makers preparing for future COVID-19 responses and other disaster responses.

Retrospective Study of Midazolam Protocol for Prehospital Behavioral Emergencies.

IntroductionAgitated patients in the prehospital setting pose challenges for both patient care and emergency medical services (EMS) provider safety. Midazolam is frequently used to control agitation in the emergency department setting; however, limited data exist in the prehospital setting. We describe our experience treating patients with midazolam for behavioral emergencies in a large urban EMS system. We hypothesized that using midazolam for acute agitation leads to improved clinical conditions without causing significant clinical deterioration.MethodsWe performed a retrospective review of EMS patient care reports following implementation of a behavioral emergencies protocol in a large urban EMS system from February 2014–June 2016. For acute agitation, paramedics administered midazolam 1 milligram (mg) intravenous (IV), 5 mg intramuscular (IM), or 5 mg intranasal (IN). Results were analyzed using descriptive statistics, Levene’s test for assessing variance among study groups, and t-test to evaluate effectiveness based on route.ResultsIn total, midazolam was administered 294 times to 257 patients. Median age was 30 (interquartile range 24–42) years, and 66.5% were male. Doses administered were 1 mg (7.1%) and 5 mg (92.9%). Routes were IM (52.0%), IN (40.8%), and IV (7.1%). A second dose was administered to 37 patients. In the majority of administrations, midazolam improved the patient’s condition (73.5%) with infrequent adverse events (3.4%). There was no significant difference between the effectiveness of IM and IN midazolam (71.0% vs 75.4%; p = 0.24).ConclusionA midazolam protocol for prehospital agitation was associated with reduced agitation and a low rate of adverse events.

Implementation of Ambulance Hotspot Strategy in Reducing Ambulance Response Time

Introduction: Ambulance response time (ART) has an inseparable relationship with mortality rates and therefore is important to be reduced. However, an unprecedented increase in road traffic congestion has led to longer ART, especially during peak hours. To reduce ART despite congested traffic, a pre-dispatched ambulance is deployed at hotspot locations during peak hours. This study aims to determine if the hotspot strategy is able to reduce ART in an Urban Emergency Medical Services system.

Prevalence and Correlates of Mental Health Status Among Pre-Hospital Healthcare Staff

Introduction:Mental stress amongst pre-hospital Emergency Medical Services (EMS) workers is an iceberg phenomenon; owing to unique occupational stressors faced by them. This study was aimed to examine the mental health status of pre-hospital EMS workers and its correlation with Post-Traumatic Stress Disorder (PTSD) and Work Environment Scale (WES).Methods:This cross-sectional study incorporated 224 emergency EMS members from urban and road EMS bases in eastern Iran in 2018. General Health Questionnaire (GHQ-28), Post-Traumatic Stress Disorder Checklist-Civilian version (PTSD-C), and Work Environment Scale (WES) were used as research instruments. Data were analyzed via SPSS Statistics software (version 21); while p<0.05 was considered significant.Results:The mean age of participants was 31.91±6.9 years; 36(16.1%) had PTSD ≥50, which increased with age (p-0.01), number of offspring (p-0.022) and time working at the EMS (p-0.002). Mean WES scores were 73.41±12.27; with a significant impact of marital status (p-0.007), the number of offspring (p-0.023), qualification (p-0.019) and less time working at the EMS (p-0.008). Mental distress was recorded in 89(39.7%) individuals. Multivariate logistic regression revealed that members at higher risk of mental distress were; those with associate’s degree (adjusted OR 3.192; 95% CI, 1.456-6.998), individuals with 1 or 2 offspring (adjusted OR 2.03; 95% CI, 0.992-4.156; adjusted OR 3.380; 95% CI, 1.483-7.704, respectively), and those with PTSD equal or higher than 50 (adjusted OR 2.504; 95% CI, 1.063-5.903), with a reverse impact of WES (p>0.05).Conclusion:PTSD adversely affected mental health and clinical performance of the subjects; while work-place environment augmented working spirit as well as psychological resilience. Strategies aiming at stress-dilution and improvements in a professional environment cannot be over-emphasized.

Abstract TMP70: Simulation Modeling Predicts Actual Patient Transport Rates Following the Implementation of a Prehospital Comprehensive Stroke Center Direct Transport Protocol

Introduction: Implementing emergency medical services (EMS) protocols that incorporate severe stroke screening and direct transport to comprehensive stroke centers (CSCs) has been advocated as a strategy to improve timely stroke care for patients with large vessel occlusion and hemorrhage, but such screening can have important unintended effects on stroke systems of care. Mathematical modeling can estimate the impact of prehospital CSC direct transport protocols, but few models have been evaluated after protocol implementation. Hypothesis: The proportion of patients transported to CSCs versus primary stroke centers (PSCs) in a mathematical model will approximate actual transport rates following implementation of a prehospital CSC direct transport protocol. Methods: A previously reported discrete event data simulation was used to model the proportion of patients with suspected stroke transported directly to CSCs in a large, urban EMS system with 8 CSCs, 24 PSCs, and a single municipal fire-based EMS agency responding to all 9-1-1 calls prior to implementation of a prehospital CSC direct transport protocol in late 2018. Electronic patient care records in which paramedics documented “suspected stroke” were included for analysis. The proportion of patients transported to CSCs versus PSCs in the 3 months (92 days) prior to and following protocol implementation were compared using Fisher’s exact test in Stata 12.1 (College Station, TX). Results: The simulation predicted that the proportion of patients transported to CSCs would increase by 8.3% following implementation of a prehospital CSC direct transport protocol. In the 3 months prior to protocol implementation, 247 of 872 (28.3%) suspected stroke patients were transported to CSCs, and 265 of 701 (37.8%) were transported to CSCs in the 3 months following implementation, a difference of 9.5% (p&lt;0.001). The model underestimated the proportion of patients transported to CSCs by 1.2%. Conclusions: A mathematical model simulating the proportion of patients transported to CSCs differed by only 1.2% compared to actual rates after implementation of a prehospital CSC direct transport protocol. Simulation modeling holds promise for estimating system-level effects prior to EMS protocol implementation.

Standard Precautions Among Emergency Medical Services in Urban and Rural Areas.

Backround: Emergency medical services (EMS) workers are at risk of exposure to bloodborne pathogens and frequently exposed to blood and bodily fluids through percutaneous injuries. This study aimed to assess the consistency with which standard precautions (SPs) among rural and urban EMS providers were used. Methods: This study consisted of a cross-sectional survey conducted with a sample of certified EMS providers in West Virginia in which we ascertained details about sociodemographic characteristics, and the frequency of consistent SP. An email invitation was sent to a comprehensive list of agencies obtained from the Office of West Virginia EMS. Findings: A total of 248 out of 522 (47%) EMS providers completed the survey. The majority of the EMS providers (76%) consistently complied with SPs; however, more than one third (38%) of urban EMS providers indicated inconsistent use compared with 19% of rural EMS providers (p = .002). Most EMS providers reported low prevention practices to exposure of blood and body fluids in both areas. Conclusion/Application to Practice: The results emphasize the need to enhanced safe work practices among EMS providers in both rural and urban areas through education and increasing self-awareness. Occupational health professional in municipalities that serve these workers are instrumental in ensuring these workers are trained and evaluated for their compliance with SPs while in the field.

Deployment of Alternative Response Units in a High-Volume, Urban EMS System

Faced with increasing demand for their services, Emergency Medical Services (EMS) agencies must find more efficient ways to use their limited resources. This includes moving beyond the traditional response and transport model. Alternative Response Units (ARUs) are one way to meet the prehospital medical needs of some members of the public while reducing ambulance transports. They are non-transport vehicles tasked with very specific medical missions. These can include acute management of low-acuity complaints, ongoing home care for chronic medical conditions, preventive medicine, and post-hospital discharge follow-up visits. Their focus can be tailored to the individual needs of the agency. The Philadelphia Fire Department (PFD) operates one of the busiest EMS systems in the country. It has added additional staff and ambulances in recent years yet continues to face an increasing call volume. In an effort to reduce ambulance transports, the PFD recently introduced two ARUs. The first unit, AR-1, is deployed on a university campus and responds to students with low acuity medical complaints or mild alcohol intoxication. It provides many of these a courtesy ride to one of two university emergency departments for further evaluation, eliminating the need for ambulance transport. The second unit, AR-2, works in an area heavily impacted by the opioid crisis. It responds to individuals who have overdosed, been revived with naloxone, and refuse ambulance transport but are interested in long-term treatment for their opioid use disorder. The staff of AR-2 has successfully placed some of these individuals in treatment programs the same day. The AR-1 program is financially supported by the university while AR-2 is funded by the PFD and a federal grant. Both have the potential to decrease ambulance transports or reduce 9-1-1 calls. Whether these or other ARU programs can be financially sustained long-term is unclear. It is also unknown if ARUs represent a better investment than using the money to purchase additional transport vehicles. However, as health care evolves, EMS must innovate and adapt so it can continue to meet the prehospital needs of the public in a timely and cost-effective manner.

Mandated 30-minute Scene Time Interval Correlates With Improved Return of Spontaneous Circulation at Emergency Department Arrival: A Before and After Study.

Conflicting ideas exist about whether or not Emergency Medical Service (EMS) personnel should treat a cardiac arrest on scene or transport immediately. Our aim was to examine patient outcomes before and after an urban EMS system implemented a protocol change mandating a 30-min scene time interval (STI) for out-of-hospital cardiac arrest (OHCA). This was a retrospective, single-center, observational study of OHCA patients before and after an EMS protocol change mandating resuscitation on scene. Data were retrieved from an EMS cardiac arrest database for all adults with non-traumatic OHCA between January 2015 and August 2016. Descriptive statistics were used to summarize the study population, and a regression model was used to determine the associations of the protocol with the return of spontaneous circulation (ROSC). A total of 633 patients were included in the study population, which was primarily male (61.3%) with a mean age of 65years. After the 30-min STI was implemented, ROSC from OHCA increased to 40.1% of cases compared to 27.3% before the protocol change (p=0.001; 95% confidence interval [CI] 0.053-0.203). The STI increased from 19min 23s to 29min 40s in the pre and post periods, respectively (p<0.001). Regression indicated that the protocol change was independently associated with an improved chance of ROSC (OR 1.81; 95% CI 1.23-2.64). A protocol change mandating a 30-min STI in OHCA correlated with increased STI and increased ROSC. While increased ROSC may not always equate with positive neurologic outcome, logistic regression indicated that the protocol change was independently associated with improved ROSC at emergency department arrival.

Paramedic-Identified Enablers of and Barriers to Pediatric Seizure Management: A Multicenter, Qualitative Study

Background: Seizures have the potential to cause significant morbidity and mortality, and are a common reason emergency medical services (EMS) are requested for a child. An evidence-based guideline (EBG) for pediatric prehospital seizures was published and has been implemented as protocol in multiple EMS systems. Knowledge translation and protocol adherence in medicine can be incomplete. In EMS, systems-based factors and providers’ attitudes and beliefs may contribute to incomplete knowledge translation and protocol implementation. Objective: The purpose of this study was to identify paramedic attitudes and beliefs regarding pediatric seizure management and regarding potential barriers to and enablers of adherence to evidence-based pediatric seizure protocols in multiple EMS systems. Methods: This was a qualitative study utilizing semi-structured interviews of paramedics who recently transported actively seizing 0–17 year-old patients in 3 different urban EMS systems. Interviewers explored the providers’ decision-making during their recent case and regarding seizures in general. Interview questions explored barriers to and enablers of protocol adherence. Two investigators used the grounded theory approach and constant comparison to independently analyze transcribed interview recordings until thematic saturation was reached. Findings were validated with follow-up member-checking interviews. Results: Several themes emerged from the 66 interviewed paramedics. Enablers of protocol adherence included point-of-care references, the availability of different routes for midazolam and availability of online medical control. Systems-level barriers included equipment availability, controlled substance management, infrequent pediatric training, and protocol ambiguity. Provider-level barriers included concerns about respiratory depression, provider fatigue, preferences for specific routes, febrile seizure perceptions, and inaccurate methods of weight estimation. Paramedics suggested system improvements to address dose standardization, protocol clarity, simplified controlled substance logistics, and equipment availability. Conclusions: Paramedics identified enablers of and barriers to adherence to evidence-based pediatric seizure protocols. The identified barriers existed at both the provider and systems levels. Paramedics identified multiple potential solutions to overcome several barriers to protocol adherence. Future research should focus on using the findings of this study to revise seizure protocols and to deploy measures to improve protocol implementation. Future research should also analyze process and outcome measures before and after the implementation of revised seizure protocols informed by the findings of this study.

Characteristics of Patients with Recurrent Emergency Medical Services Utilization for Symptomatic Hypoglycemia in an Urban Setting

Background: Symptomatic hypoglycemia frequently results in utilization of emergency medical services (EMS). Understanding the characteristics of hypoglycemic patients with high EMS utilization may help providers optimize resource allocation. Objective: To describe characteristics of patients utilizing EMS for hypoglycemia and to determine if any factors identifiable in the prehospital setting are associated with recurrent EMS utilization. Methods: A retrospective chart review of prehospital care records from an urban EMS system was performed. Patients who received oral glucose, parenteral glucose, or intramuscular glucagon for hypoglycemia over a one-year period were identified. Extracted information included demographics, prehospital treatment, disposition, zip code median income, and the number of subsequent EMS utilizations within 365 days. Results: We identified 549 subjects, mean age 55 years (range 5 to 104, 65% male). The mean glucose level for all patients was 44 mg/dl with standard deviation (SD) of 15. In total, 69% of patients received oral glucose, 26% received parenteral glucose, 3% received glucagon, and 2% received more than one medication. At the index visit, 81% of patients accepted hospital transportation. The rate of recurrent EMS utilization for hypoglycemia was 10%, and 3% of patients had 3 or more repeat utilizations within 365 days. The mean finger-stick glucose at index visit was 39 mg/dL (SD 15) for patients with multiple EMS utilizations and 44 mg/dL (SD 14) for those with one EMS visit (P = 0.006). Repeat utilizers were more likely to have received medications other than oral glucose at index visit, 51% vs. 28% (P < 0.001). Age, gender, median zip code income, and disposition were not associated with recurrent EMS utilization. The overall annual rate of hypoglycemia requiring EMS treatment per estimated diabetic population was 0.84%. Conclusion: A low proportion of patients utilizing EMS for hypoglycemia had subsequent EMS visits within 365 days. Those who did had lower initial blood glucose at the index visit and were more likely to have received prehospital treatment with medications other than oral glucose. Demographic characteristics did not yield any patterns predictive of repeat utilization. Refusing transport to the hospital after EMS treatment for hypoglycemia did not increase the risk of recurrent utilization.

How do traffic and demand daily changes define urban emergency medical service (uEMS) strategic decisions?: A robust survival model

This paper presents a methodology to locate vehicle base stations using robust optimization to address daily traffic and demand changes, which are due to what we define as city dynamics. The model allows us to better understand how these daily changes affect an urban emergency medical service (uEMS) response system.The methodology incorporates two steps. The first step uses scenario-based optimization and survival function theory to locate vehicle base stations, whereas the second step uses agent-based simulation to assess the solution performance and compare it with less robust and non-survival prone solutions. The proposed models are tested for different situations using real data from the city of Porto.The results of the sensitivity analysis of the model show the relevance of understanding the dynamics of cities and how they impact uEMS response systems. Useful insights regarding the number of stations and the average response time are addressed together with the minimum number of stations required for different maximum response time limits and different survival coefficients.Finally, we conclude on how a robust solution improves response time by accounting for city dynamics, and how a heterogeneous survival based approach benefits victims’ by properly measuring the system response in terms of the victim’ outcomes.

An Urban 9-1-1 System’s Experience with Left Ventricular Assist Device Patients

Background: Left ventricular assist devices (LVADs) are used with increasing frequency and left in place for longer periods of time. Prior publications have focused on the mechanics of troubleshooting the device itself. We aim to describe the epidemiology of LVAD patient presentations to emergency medical services (EMS), prehospital assessments and interventions, and hospital outcomes. Methods: This is a retrospective chart review of known LVAD patients that belong to a single academic center’s heart failure program who activated the 9-1-1 system and were transported by an urban EMS system to one of the center’s 2 emergency departments between January 2012 and December 2015. Identifying demographics were used to query the electronic medical record of the responding city fire agency and contracted transporting ambulance service. Two reviewers abstracted prehospital chief complaint, vital signs, assessments, and interventions. Emergency department and hospital outcomes were retrieved separately. Results: From January 2012 to December 2015, 15 LVAD patients were transported 16 times. The most common prehospital chief complaint was weakness (7/16), followed by chest pain (3/16). Of the 7 patients presenting with weakness, one was diagnosed with a stroke in the emergency department. Another patient was diagnosed with subarachnoid hemorrhage and expired during hospital admission. This was the only death in the cohort. The most common hospital diagnosis was GI bleed (3/16). The overall admission rate was 87.5% (14/16). Conclusions: EMS interactions with LVAD patients are infrequent but have high rates of admission and incidence of life-threatening diagnoses. The most common prehospital presenting symptoms were weakness and chest pain, and most prehospital interactions did not require LVAD-specific interventions. In addition to acquiring technical knowledge regarding LVADs, EMS providers should be aware of non-device-related complications including intracranial and GI bleeding and take this into account during their assessment.

Optimal Scene Time to Achieve Favorable Outcomes in Out-of-hospital Cardiac Arrest: How Long Is Too Long?

BackgroundDespite advances in resuscitation science and public health, out-of-hospital cardiac arrest (OOHCA) cases have an average survival rate of only 12% nationwide, compared to 24.8% of cases occurring in hospital. Many factors, including resuscitation interventions, contribute to positive patient outcomes and have, therefore, been studied in attempts to optimize emergency medical services (EMS) protocols to achieve higher rates of return of spontaneous circulation (ROSC) in the field. However, no consensus has been met regarding the appropriate amount of time for EMS to spend on scene.AimA favorable outcome is defined as patients that achieved the combination of ROSC and a final disposition of “ongoing resuscitation in the emergency department (ED).” The primary purpose of this preliminary study was to determine the scene time interval (STI) in which American urban EMS systems achieved the highest rates of favorable outcomes in non-traumatic OOHCAs.MethodsAll EMS-related data, including demographics, presenting rhythm, airway management, chemical interventions, and ROSC were recorded using a standardized EMS charting system by the highest-ranking EMS provider on the ambulance. The reports were retrospectively collected and analyzed.ConclusionOur data suggest that the optimal 20-minute STI for OOHCA patients in an urban EMS system is between 41 and 60 minutes. Interestingly, the 10-minute interval within the 41-60 minute cohort that provided the highest rate of ROSC was between 41 and 50 minutes. Generally, the longer the STI, the greater the percentage of favorable outcomes up to the 50-minute mark. Once past 50 minutes, a phenomenon of diminishing return was observed and the rates of favorable outcomes sharply declined. This suggests a possible “sweet spot” that may exist regarding the optimal scene time in a cardiac arrest encounter. Significant differences between the average number of interventions per patient were found, however, many confounding factors and the limited data set make the results difficult to generalize.

256 Safety and Efficacy of a Sobriety Emergency Response Unit in an Urban Emergency Medical Services System

Approximately 1% of all emergency department (ED) visits in the United States involve uncomplicated alcohol-related complaints, and these patients may undergo unnecessary testing while occupying limited ED resources. Most of these patients arrive by emergency medical services (EMS) ambulance. This is a preliminary evaluation of the safety and efficacy of a new Sobriety Emergency Response (SOBER) Unit, which is a unique EMS resource staffed with a firefighter/paramedic, a nurse practitioner and caseworker, whose mission is to medically clear publicly inebriated patients and transport them to a sobering center, where they can be connected to appropriate mental health and social services, instead of transport to an ED. The study was conducted in the City of Los Angeles, which has a population of approximately 4.1 million covering 471 square miles. Los Angeles Fire Department (LAFD) provides all 911 EMS responses via a tiered, fire-based basic life support (BLS) and advanced life support (ALS) system. Data were collected prospectively for the first 6 months of implementation of the SOBER Unit, from November 2017 to May 2018. Inclusion criteria included age between 18-65 years old, suspected alcohol intoxication, no evidence of head injury and non-combative patients. Exclusion criteria included any loss of consciousness, Glasgow Coma Scale < 14, any anticoagulant use, pulse rate > 120 or < 50 beats per minute, blood glucose > 250 or < 60 mg/dL, or any evidence of trauma above the clavicles. Descriptive statistics were captured. The SOBER Unit was operational Tuesday through Friday from 1000-2000 hours around the Skid Row area of downtown Los Angeles. The unit was activated via request by on-scene LAFD units or responding to calls at their discretion. All secondary transports from the sobering center to an ED were captured. There were 419 patients evaluated by the SOBER Unit, of whom 374 (89.3%) were transported. Of the 374 transports, 363 (97%) were taken directly to the sobering center in lieu of transport to an ED. The mean age was 46.6 years (IQR 17, median 48) and 337 (85%) were male. Additionally, 6 (2%) were medically cleared and directly transported to a mental health urgent care center. Of those treated, common comorbidities were substance abuse (51%), hypertension (14%) and psychiatric illness (10%). There were 393 total transports for 298 unique patients. Six patients had 5 or more transports, of which 1 was placed in long term substance abuse housing through the sobering center and had no further 911 or SOBER Unit contacts. There were 10 secondary transports from the sobering center to an ED: 8 were transported via non-emergency van and 2 were transported via 911 ambulance (1 for seizure activity and the other because his wheelchair could not be accommodated in the non-emergency van). In the study period, all patients who required secondary transport were either treated and released from the ED or discharged home within 72 hours, with no significant adverse effects. Preliminary data suggests that a mobile SOBER unit is a safe and efficacious means of medically clearing public inebriates and transporting them to a supportive, non-ED setting. Further research is needed to determine its long-term impact on recidivism and cost-effectiveness.

Can Altering Grip Technique and Bag Size Optimize Volume Delivered with Bag-Valve-Mask by Emergency Medical Service Providers?

Introduction: Emergency Medical Services (EMS) professionals rely on the bag-valve-mask (BVM) to provide life-saving positive-pressure ventilation in the prehospital setting. Multiple emergency medicine and critical care studies have shown that lung-protective ventilation protocols reduce morbidity and mortality. A recent study has shown that the volumes typically delivered by EMS professionals with the adult BVM are often higher than recommended by lung-protective ventilation protocols. Our primary objective was to determine if a group of EMS professionals could reduce the volume delivered by adjusting the way the BVM was held. Secondary objectives included 1) if the adjusted grip allowed for volumes more consistent with lung-protection ventilation strategies and 2) comparing volumes to similar grip strategies used with a smaller BVM. Methods: A patient simulator of a head and thorax was used to record respiratory rate, tidal volume, peak pressure, and minute volume delivered by participants for 1 minute each across 6 different scenarios: 3 different grips (using the thumb and either 3 fingers, 2 fingers, or one finger) with 2 different sized BVMs (adult and pediatric). Trials were randomized by blindly selecting a paper with the scenario listed. A convenience sample of EMS providers was used based on EMS provider and research staff availability. Results: We enrolled 50 providers from a large, busy, urban hospital-based EMS agency a mean 8.60 (SD = 9.76) years of experience. Median volumes for each scenario were 836.0 mL, 834.5 mL, and 794 mL for the adult BMV (p = 0.003); and 576.0 mL, 571.5 mL, and 547.0 mL for the pediatric BVM (p < 0.001). Across all 3 grips, the pediatric BVM provided more breaths within the recommended volume range for a 70 kg patient (46.4% vs. 0.4%; p < 0.001) with only a 1.1% of breaths below the recommended tidal volume. Conclusion: The study suggests that it is possible to alter the volume provided by the BVM by altering the grip on the BVM. The tidal volumes recorded with the pediatric BVM were above recommended range in 2 of the 3 grips. The volumes of the pediatric BVM were overall more consistent with lung-protective ventilation volumes when compared to all 3 finger-grips of the adult BVM.

Self-Assessment Feedback Form Improves Quality of Out-of-Hospital CPR

Objective: Various continuous quality improvement (CQI) approaches have been used to improve quality of cardiopulmonary resuscitation (CPR) delivered at the scene of out-of-hospital cardiac arrest. We evaluated a post-event, self-assessment, CQI feedback form to determine its impact on delivery of CPR quality metrics. Methods: This before/after retrospective review evaluated data from a CQI program in a midsized urban emergency medical services (EMS) system using CPR quality metrics captured by Zoll Medical Inc. X-series defibrillator ECG files in adult patients (≥18 years old) with non-traumatic out-of-hospital cardiac arrest. Two 9-month periods, one before and one after implementation of the feedback form on December 31, 2013 were evaluated. Metrics included the mean and percentage of goal achievement for chest compression depth (goal: >5 centimeters [cm]; >90%/episode), rate (goal: 100–120 compressions/minute [min]), chest compression fraction (goal: ≥75%), and preshock pause (goal: <10 seconds [sec]). The feedback form was distributed to all EMS providers involved in the resuscitation within 72 hours for self-review. Results: A total of 439 encounters before and 621 encounters after were evaluated including basic life support (BLS) and advanced life support (ALS) providers. The Before Group consisted of 408 patients with an average age of 61 ± 17 years, 61.8% male. The After Group consisted of 556 patients with an average age of 61 ± 17 years, 58.3% male. Overall, combining BLS and ALS encounters, the mean CPR metric values before and after were: chest compression depth (5.0 cm vs. 5.5 cm; p < 0.001), rate (109.6/min vs 114.8/min; p < 0.001), fraction (79.2% vs. 86.4%; p < 0.001), and preshock pause (18.8 sec vs. 11.8 sec; p < 0.001), respectively. Overall, the percent goal achievement before and after were: chest compression depth (48.5% vs. 66.6%; p < 0.001), rate (71.8% vs. 71.7%, p = 0.78), fraction (68.1% vs. 91.0%; p < 0.001), and preshock pause (24.1% vs. 59.5%; p < 0.001), respectively. The BLS encounters and ALS encounters had similar statistically significant improvements seen in all metrics. Conclusion: This post-event, self-assessment CQI feedback form was associated with significant improvement in delivery of out-of-hospital CPR depth, fraction and preshock pause time.