Emergency Medical Services Organizations Research Articles

Regional variation in out-of-hospital cardiac arrest incidence and outcome.

The health and policy implications of regional variation in incidence and outcome of out-of-hospital cardiac arrest remain to be determined. To evaluate whether cardiac arrest incidence and outcome differ across geographic regions. Prospective observational study (the Resuscitation Outcomes Consortium) of all out-of-hospital cardiac arrests in 10 North American sites (8 US and 2 Canadian) from May 1, 2006, to April 30, 2007, followed up to hospital discharge, and including data available as of June 28, 2008. Cases (aged 0-108 years) were assessed by organized emergency medical services (EMS) personnel, did not have traumatic injury, and received attempts at external defibrillation or chest compressions or resuscitation was not attempted. Census data were used to determine rates adjusted for age and sex. Incidence rate, mortality rate, case-fatality rate, and survival to discharge for patients assessed or treated by EMS personnel or with an initial rhythm of ventricular fibrillation. Among the 10 sites, the total catchment population was 21.4 million, and there were 20,520 cardiac arrests. A total of 11,898 (58.0%) had resuscitation attempted; 2729 (22.9% of treated) had initial rhythm of ventricular fibrillation or ventricular tachycardia or rhythms that were shockable by an automated external defibrillator; and 954 (4.6% of total) were discharged alive. The median incidence of EMS-treated cardiac arrest across sites was 52.1 (interquartile range [IQR], 48.0-70.1) per 100,000 population; survival ranged from 3.0% to 16.3%, with a median of 8.4% (IQR, 5.4%-10.4%). Median ventricular fibrillation incidence was 12.6 (IQR, 10.6-5.2) per 100,000 population; survival ranged from 7.7% to 39.9%, with a median of 22.0% (IQR, 15.0%-24.4%), with significant differences across sites for incidence and survival (P<.001). In this study involving 10 geographic regions in North America, there were significant and important regional differences in out-of-hospital cardiac arrest incidence and outcome.

Developing a Consensus Framework for an Effective and Efficient Disaster Response Health System: A National Call to Action

Eighteen national organizations, representing medicine, dentistry, nursing, hospital systems, public health, and emergency medical services, have worked together to create a framework for a national and regional disaster response health system that is scalable, multidisciplinary, and seamless, and based on an all-hazards approach. In July 2005 and June 2006 the American Medical Association (AMA) and the American Public Health Association (APHA) convened the AMA/APHA Linkages Leadership Summit, with funding from the Centers for Disease Control and Prevention under the Terrorism Injuries: Information Dissemination and Exchange (TIIDE) program. As cofacilitators, James J. James, MD, DrPH, MHA, director of the AMA Center for Public Health Preparedness and Disaster Response, and Georges Benjamin, MD, FACP, FACEP(E), APHA executive director, met with leaders from 16 national medical, dental, hospital, nursing, hospital systems, public health, and emergency medical services organizations in Chicago (2005) and New Orleans (2006) to deliberate the deficiencies in the medical and public health disaster response system and the lack of necessary linkages between key components of this system: the health care, emergency medical services, and public health sectors. The goal was to reach consensus on a set of overarching recommendations to improve and sustain health system preparedness and to combine each organization's advocacy expertise and experience to promote a shared policy agenda. The full summit report contains 53 consensus-based recommendations, which will serve as the framework for a coordinated national agenda for strengthening health system preparedness for terrorism and other disasters. The 9 most overarching critical recommendations from the report are highlighted here. Although the summit report presents important perspectives on the subject of preparedness for public health emergencies, we must understand that preparedness is a process and that these recommendations must be reviewed and refined continually over time.

SURGERY OF CEREBRAL TRAUMA AND ASSOCIATED CRITICAL CARE

The last 30 years have been both exciting and frustrating for those in the field of traumatic brain injury (TBI). Much has been learned, but no new treatment has been shown to improve patient outcomes despite the execution of many clinical trials. The overall incidence of TBI has decreased, probably because of intensive efforts toward prevention and education. Rigorous assessment of available research has produced several evidence-based guidelines for the management of neurotrauma patients. The creation of organized emergency medical services systems in many regions has improved prehospital care. Computed tomographic scans have become the gold standard for obtaining immediate images of patients with TBI, and ongoing advances in visualizing cerebral metabolism continue to be remarkable. The major current question regarding surgical treatment for TBI involves the role of decompressive craniectomy, an operation that first fell out of favor and has since (in the last three decades) enjoyed a resurgence of interest. Growing interest in the intensive care management of TBI patients helped to establish the new field of neurocritical care. Prophylactic hyperventilation is no longer recommended, and earlier recommendations for aggressive elevation of blood pressure have been softened to endorsement of a cerebral perfusion pressure of 60 mmHg. Recombinant factor VIIa is increasingly used for minimizing complications related to coagulopathy. Intracranial pressure monitoring is now recommended for the majority of TBI patients. At present, available technologies allow measurement of other aspects of cerebral metabolism including cerebral blood flow, brain oxygen tension, biochemistry, and electrical activity. Therapeutic interventions that are growing in popularity or are presently under investigation include administration of hypertonic saline, hyperoxygenation, decompressive craniectomy, and hypothermia. Rehabilitation has become accepted as an important part of the TBI recovery process, and additional work is needed to identify optimal interventions in this area. Socioeconomic factors will play a growing role in our treatment of TBI patients. Although much progress has been made in the last 30 years, the challenge now is to find ways to translate that progress into improved care and outcomes for TBI patients.

Why are people without medical needs transported by ambulance? A study of indications for pre-hospital care

The purpose of this report was to describe the characteristics of patients transported by ambulance, in spite of being evaluated by the ambulance staff at the scene as not requiring prehospital care. A second aim was to compare these patients with those judged as being in need of this care. Three ambulance service districts located in different rural and metropolitan geographical areas were included in the study and all three were covered by a single emergency dispatch centre. Following the dispatch of ambulances, the staff assessed and recorded the medical needs of the patients at the scene, according to a questionnaire developed for the study. In addition to the questionnaire, data were extracted from the ambulance medical records database for each patient. If the patients were just transported by ambulance without receiving any other prehospital intervention, they were assessed as not being in need of the emergency service. The evaluation included events at the scene and during transportation. The ambulance staff making the needs assessments were emergency medical technicians and registered nurses. In this report, 604 patients who did not require prehospital care are described and compared with the remaining group of patients who required this care (1373). For analysis, descriptive statistics were used to analyse the data. The ambulance staff assessed that, among patients reported by the emergency medical dispatch centre as having abdominal or urinary problems, 42% did not need the ambulance service. Even among intrahospital transports (patients for whom medical personnel made the request for an ambulance), 45% did not require ambulance transport, as judged by the ambulance staff. Among patients reported by the emergency medical dispatch centre as having chest pain or other heart symptoms or trauma/accidents, respectively, only small percentages (18%) and (17%) did not require the ambulance service, as assessed by the ambulance staff. Most of the patients without obvious medical needs had been allocated an ambulance response for nonurgent conditions, that is priority level 2 or 3, but patients without medical needs were even found at the highest priority level 1. Of the patients who did not require an ambulance, more than half (55%) would have been able to get to a hospital in their own car or by taxi, whereas the remainder of the patients needed a transport vehicle in which they could lie down, but which was not equipped and staffed like an ambulance. Among the patients transported by the emergency medical service system in the study areas, a significant percentage were judged by the ambulance staff as not being in need of prehospital interventions. The majority were transported by a fully equipped emergency medical ambulance to an emergency medical department at a hospital, without requiring any prehospital interventions either at the scene or during transportation. The emergency medical service organization has to develop clear criteria for the utilization of ambulance services that can be accepted and implemented by the dispatch centres and by healthcare personnel. These criteria need to include safety margins and at the same time enable the appropriate use of resources.

Organizational policy and other factors associated with emergency medical technician seat belt use

Introduction The purpose of this study was to determine factors associated with seat belt usage among Emergency Medical Technicians (EMTs). Methods As part of biennial re-registration paperwork, nationally registered EMTs completed a survey on the safety and health risks facing Emergency Medical Services (EMS) providers. Respondents were asked to describe their seat belt use while in the front seats of an ambulance. They were categorized as “high” in seat belt use if it had been more than a year since they had not worn their seat belt or “low” in seat belt use if they had not worn their seat belt at least once within the past 12 months. A logistic regression model was fit to estimate the association between seat belt use, organizational seat belt policy, type of EMS organization worked for, EMT certification level, and the size of community where EMS work is performed. Results Of the 41,823 EMTs that re-registered in 2003, surveys were received from 29,575 (70.7%). A significant interaction between organizational seat belt policy and type of EMS organization was found to exist. Participants reporting no organizational seat belt policy had lower odds of seat belt usage when compared to individuals that do have a seat belt policy. Odds Ratios ranged from 0.20 (95% CI 0.10–0.40) for military organizations to 0.59 (95% CI 0.38–0.93) for private EMS organizations. Paramedics and those working in rural areas also had lower odds of seat belt use. Conclusion Several factors were found to be associated with seat belt usage among EMTs while in the front compartment of an ambulance. However, it appears that only one, organizational policy, is a modifiable characteristic.

Realities of Rural Emergency Medical Services Disaster Preparedness

Disaster preparedness is an area of major concern for the medical community that has been reinforced by recent world events. The emergency healthcare system must respond to all types of disasters, whether the incidents occur in urban or rural settings. Although the barriers and challenges are different in the rural setting, common areas of preparedness must be explored. This study sought to answer several questions, including: (1) What are rural emergency medical services (EMS) organizations training for, compared to what they actually have seen during the last two years?; (2) What scale and types of events do they believe they are prepared to cope with?; and (3) What do they feel are priority areas for training and preparedness? Data were gathered through a multi-region survey of 1801 EMS organizations in the US to describe EMS response experiences during specific incidents as well as the frequency with which these events occur. Respondents were asked a number of questions about local priorities. A total of 768 completed surveys were returned (43%). Over the past few years, training for commonly occurring types of crises and emergencies has declined in favor of terrorism preparedness. Many rural EMS organizations reported that events with 10 or fewer victims would overload them. Low priority was placed on interacting with other non-EMS disaster response agencies, and high priority was placed on basic staff training and retention. Maintaining viable, rural, emergency response capabilities and developing a community-wide response to natural or man-made events is crucial to mitigate long-term effects of disasters on a local healthcare system. The assessment of preparedness activities accomplished in this study will help to identify common themes to better prioritize preparedness activities and maximize the response capabilities of an EMS organization.

Implications of the Mechanical (PCI) vs Thrombolytic Controversy for ST Segment Elevation Myocardial Infarction on the Organization of Emergency Medical Services

With the many advances in rapid reperfusion therapy for management of acute ST segment elevation myocardial infarction (STEMI), there is a need to revisit the current plan for prehospital triage (point of entry). Until recently in Boston, and nationwide, there has been a policy that patients with suspected acute MI were brought to the nearest hospital. Then, if ST segment elevation was present, patients were treated with either thrombolytic therapy or primary percutaneous coronary intervention (PCI). Recent data, however, have shown that with advances in interventional devices, techniques and institutional experience, primary PCI is associated with improved outcomes compared with thrombolytic therapy for all patients with STEMI when provided at expert centers with high institutional volumes, with experienced interventional cardiologists as the operators, and with relatively short time to treatment. We describe the rationale for and the implementation of the Boston EMS STEMI Triage Plan and Treatment Registry. Many of the issues that prompted the implementation of the Boston STEMI plan are relevant to all EMS systems. Among these issues are the accuracy of prehospital identification of STEMI patients, the availability of mechanical reperfusion therapy, the appropriate triage of patients with complicated myocardial infarction or shock, as well as the local consensus regarding strength of the evidence favoring mechanical reperfusion. This article describes the history of the Boston EMS STEMI Triage Plan and Treatment Registry and suggests the need for other EMS systems to develop a systematic approach to patients with STEMI.

Etomidate-Facilitated Intubation in the Prehospital Setting

Environmental conditions, limited resources, and safety concerns can lead to airway management challenges in the prehospital setting. Few emergency medical services organizations have implemented the emergency department gold standard of rapid sequence intubation. Some have used an induction agent alone (facilitated intubation). These authors compared success rates for facilitated intubation before and after introduction of an etomidate protocol …

R ESUSCITATION IN THE O UT-OF-HOSPITAL S ETTING : M EDICAL F UTILITY C RITERIA FOR O N-SCENE P RONOUNCEMENT OF D EATH

The complete and irreversible cessation of life is often difficult to determine with complete confidence in the dynamic environment of out-of-hospital emergency care. As a result, resuscitation efforts often are initiated and maintained by emergency medical services (EMS) providers in many hopeless situations. Medical guidelines are reviewed here to aid EMS organizations with respect to decisions about: 1) initiating or waiving resuscitation efforts; 2) the appropriate duration of resuscitation efforts; and 3) recommended procedures for on-scene or prehospital pronouncement of death (termination of resuscitation). In cases of nontraumatic cardiac arrest, few unassailable criteria, other than certain physical signs of irreversible tissue deterioration, exist for determining medical futility at the initial encounter with the patient. Thus, the general medical recommendation is to attempt to resuscitate all patients, adult or child, in the absence of rigor mortis or dependent lividity. Conversely, well-founded guidelines now are available for decisions regarding termination of resuscitation in such patients once they have received a trial of advanced cardiac life support. In practice, however, the final decision to proceed with on-scene pronouncement of death for these patients may be determined more by family and provider comfort levels and the specific on-scene environment. For patients with posttraumatic circulatory arrest, the type of injury (blunt or penetrating), the presence of vital signs, and the electrocardiographic findings are used to determine the futility of initiating or continuing resuscitation efforts. In general, patients who are asystolic on-scene are candidates for on-scene pronouncement, regardless of mechanism. With a few exceptions, blunt trauma patients with a clearly associated mechanism of lethal injury are generally candidates for immediate cessation of efforts once they lose their pulses and respirations. Regardless of the medical futility criteria, specialized training of EMS providers and targeted related testing of operational issues need to precede field implementation of on-scene pronouncement policies. Such policies also must be modified and adapted for local issues and resources. In addition, although the current determinations of medical futility, as delineated here, are important to establish for societal needs, the individual patient's right to live must be kept in mind always as new medical advances are developed.

Emerging Organizational Structures in the Ambulance Industry in the United States

This analysis seeks to identify emerging forms of organizations in emergency medical services (EMS) in the United States, to provide examples of them, to relate them to changes in healthcare generally, and to apply a classification scheme. Public policy issues related to these new forms of organizations and lessons from other areas of the healthcare system are identified. Recent changes in the healthcare system in the United States have been marked by modifications in the structure of organizations that provide and pay for health services. New forms of organizations and alliances among existing organizations have emerged in an effort to improve the efficiency of the services provided and to improve organizations' market positions. Reflecting increased competition within EMS and the demands of the changing health-care delivery system, several types of organizations have begun to emerge in EMS that resemble those occurring in health care generally. These include forms of horizontal integration, such as consolidated ambulance services and various models of ambulance service networks; and forms of vertical integration, such as demand management programs and public-private joint ventures. The ultimate end might be complete integration with a carve-out of all non-scheduled care. Although changes in EMS organizations result largely from marketplace decisions by sellers and purchasers, this does not mean that there is no public policy role. While new organizational forms may increase the ambulance industry's efficiency, public policy makers must be concerned about quality and access as well. Some policy responses will promote marketplace changes, others will accept them generally, but will seek to correct problems, and a third group will attempt to restrain the market.

A C ASE S ERIES A NALYSIS OF M ASS C ASUALTY I NCIDENTS

Introduction. Mass casualty incidents (MCIs) are infrequent but potentially overwhelming events that can stress the capabilities of even the most organized emergency medical services (EMS) system. The Maryland EMS system has been identified as a pioneer and leader in the field of prehospital emergency care and, as with many states, Maryland's regional preparation for MCIs has been integrated into its overall EMS systems planning. Objective. To determine how successful this integration has been by examining a three-year history of response to MCIs in Maryland. Methods. A three-year case series of MCIs in Maryland was obtained from a Nexis national news publications search. These MCIs were cross-referenced with U.S. postal ZIP codes and the U.S. Census Bureau's ZIP code files. They were then mapped and summary statistics were prepared for analysis. Data obtained through the Maryland Health Services Cost Review Commission for all severely injured patients discharged from Maryland hospitals were obtained over the same three-year period for comparison. Results. Eight MCIs occurred over a three-year period, resulting in a total of 203 injuries. An average of 25.4 ± 10.7 injuries occurred per MCI. A total of 158 (77.8%) of injuries necessitated ambulance transportation. An average of 3.1 ± 1.1 hospitals were involved per MCI. Conclusions. The Maryland EMS system was effective in responding to MCIs ranging in size from 10 to nearly 40 injuries. Analyzing MCIs that reoccur on a year-to-year basis should figure into the planning process for EMS systems.

Injury prevention: is there a role for out-of-hospital emergency medical services?

To review the literature for options for integrating injury prevention into the role of out-of-hospital emergency medical services (EMS). Computerized searches of the English-language literature from 1966 through 1994 were conducted using the MEDLINE and National Association of EMS Physicians (NAEMSP) databases. These were supplemented by hand searches of pertinent journals not indexed on MEDLINE or by NAEMSP and the reference lists of retrieved articles. Key words searched included emergency medical services, accident, injury, prevention, and safety. The review included all articles that described the experience of EMS organizations or individuals providing primary injury prevention (PIP) services or that proposed EMS PIP activities. PIP EMS experiences and PIP activities proposed for EMS included: preventing injuries in EMS providers, serving as role models, identifying persons at risk for injury, providing prevention counseling, collecting injury data, surveying residences and institutions for injury risks and hazards, conducting educational programs and media campaigns, and advocating legislative changes that promote injury prevention. Few studies have evaluated the effectiveness of EMS PIP activities. As changes in the market compel health care systems to focus more on prevention, EMS organizations and individual providers may be assuming new injury prevention roles. Some EMS systems in many parts of the country have incorporated PIP into their work. It is necessary, however, to determine which PIP roles are effective and how they will be supported.

Advantages and limitations of medical dispatching

One of the main features of the French emergency medical services (EMS) system as it has been developed during the last 40 years is the participation of a physician in each stage of the EMS organization. Thus, in the 100 French emergency medical dispatch centres, all calls received on 15, the national medical emergency phone number, are medically dispatched. The main advantages are: (i) better security for the caller; (ii) proper adaptation of the response to the emergency; (iii) a quicker and more efficient intervention time; (iv) the hospital is informed of the arrival of an emergency; (v) the respect of medical secrecy; (vi) a good cost-efficiency ratio in the use of intervention means. The main limitations are connected with: (i) the inaccuracy of certain calls and problems of dialogue with the caller; (ii) the poor acceptance of the system's obligations by some of the callers, patients, physicians or any other partners of the EMS organization. In the future the implementation of the multi-purpose European emergency number 112 will probably require the system's adaptation to it.

Who Calls the Shots? EMS Operations Control and the Role of the Communications Center

Once ignored by health care and management theorists, emergency medical service (EMS) has begun to attract attention to its traditional policies and practices. Long-standing notions about job qualifications, job responsibilities, organizational structure, and operations control are being challenged by alternative approaches such as System Status Management (SSM), Computer-Aided Dispatch (CAD), and Emergency Medical Dispatch (EMD). One important characteristic of these new models is their emphasis on the role of the communications center in controlling operations. Convincing arguments for these systems have been advanced, and they have been implemented successfully in many areas.Despite these developments, variations of the traditional model which minimizes the importance of the communications center and emphasizes control by field supervisors still characterize many, if not most, EMS systems in the United States. While this probably is due to a natural resistance to change and local political concerns, data supporting the new systems unfortunately are only anecdotal. Except for superficial comparisons, the traditional and alternative approaches have not been examined in light of accepted management theory and principles. Therefore, this paper will analyze the communications center and operations control from a theoretical standpoint to determine where in an EMS organization, control is exercised most naturally, and how these findings could impact on management effectiveness.

An Unexpected Burden—The Safety of Air Ambulances

To the Editor. —As members of the American Medical Association's (AMA) Commission on Emergency Medical Services, we wish to respond to the article entitled An Unexpected Burden, 1 which appeared recently inThe Journal's A PIECE OF MY MIND section. This thoughtful essay described a physician's decision to dispatch a hospital-based medical helicopter to transport a critically ill patient and the physician's reaction to the helicopter's subsequent crash, due apparently to flying in adverse weather conditions. The Commission on Emergency Medical Services, composed of 27 national emergency medical services organizations, advises the AMA Board of Trustees on matters relating to emergency medical care. In October 1986, the Board asked the Commission to conduct a study of air ambulance services in response to the alarmingly high accident rate. Commission members intimately familiar with aeromedical transport have completed this study, which will be presented to the AMA House of Delegates at

Introduction to Emergency Medical Services (EMS) Organization

Experience and history have taught us that much can be done for the sick and injured before such patients reach the hospital. From the legacy of the Good Samaritan to the modern day organization of emergency medical services, the immediate care of those stricken has undergone significant change in both philosophy and practice. While many prehospital care organizations with roots established deeply in the past still flourish, modern emergency care, in the new world at least, has developed rapidly only over the past ten years.In the United States, a concerted effort to improve the care of the wounded during the Civil War led to the introduction of the “flying ambulances” used earlier by Napoleon's Chief Surgeon, Larrey. Americans made significant contributions to acute care with the work of such noted men as Crile, with his form of external pneumatic counterpressure; Kouwenhoven, Knickerbocker and Jude at lohns Hopkins; Beck and the first reported defibrillation in a patient; Safar and his co-workers with the rediscovery of mouth-to-mouth; and many others.

Education and Training of Medical Students and Physicians in Emergency Medicine in the German Democratic Republic

The effectiveness even of the best organized emergency medical services (EMS) system depends on the level of knowledge and the abilities of those persons who are the first at the scene. Only on few occasions will that be a physician specialist in resuscitology. So it seems necessary to educate and train laymen, medical students, and physicians in life saving methods. This should be done in a uniform way concerning organization and contents. In the German Democratic Republic (GDR), we try to perform this task on a nationwide basis.

Role of Anesthesiology in Emergency Medical Services (EMS) in Poland

Improvements of results in emergency care of critically ill patients can be realized if EMS organizations are properly based on local conditions. The Emergency Medical Unit is the first of three parts of the Integrated Health Service in Poland. The second part is in-hospital treatment. The third part is outpatient care. In most hospitals, the head of the department of anesthesiology and intensive therapy coordinates each emergency medical unit. Each unit consists of ambulances (mobile intensive care units), admission (emergency) rooms, and an intensive medical care unit (ICU). A specialization program was created and physicians who complete this type of training obtain the title “specialist in anesthesiology and intensive therapy.”This four year specialization program contains the educational elements necessary to administer all types of modern anesthesia, and provides full preparation for work in mobile and stationary intensive medical care units as well. Such training has also given these specialists the chance to initiate treatment methods for chronic pain. An examination consisting of practical tests, multiple choice written knowledge tests, and oral tests completes the program. The latter is a conversation with a commission, consisting of full professors and associate professors in anesthesiology and intensive therapy.