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Biomedical subjects

E Brooke Lerner

Publications and source records attributed to E Brooke Lerner.

31 records · Page 2Linked to original sources
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Law Enforcement Agency Defibrillation (LEA-D): proceedings of the National Center for Early Defibrillation Police AED Issues Forum.

Why does LEA-D intervention seem to work in some systems but not others? Panelists agreed that some factors that delay rapid access to treatment, such as long travel distances in rural areas, may represent insurmountable barriers. Other factors, however, may be addressed more readily. These include: absence of a medical response culture, discomfort with the role of medical intervention, insecurity with the use of medical devices, a lack of proactive medical direction, infrequent refresher training, and dependence on EMS intervention. Panelists agreed that successful LEA-D programs possess ten key attributes (Table 6). In the end, the goal remains "early" defibrillation, not "police" defibrillation. It does not matter whether the rescuer wears a blue uniform--or any uniform, for that matter--so long as the defibrillator reaches the victim quickly. If LEA personnel routinely arrive at medical emergencies after other emergency responders or after 8 minutes have elapsed from the time of collapse, an LEA-D program will be unlikely to provide added value. Similarly, if police frequently arrive first, but the department is unwilling or unable to cultivate the attributes of successful LEA-D programs, efforts to improve survival may not be realized. In most communities, however, LEA-D programs have tremendous lifesaving potential and are well worth the investment of time and resources. Law enforcement agencies considering adoption of AED programs should review the frequency with which police arrive first at medical emergencies and LEA response intervals to determine whether AED programs might help improve survival in their communities. It is time for law enforcement agency defibrillation to become the rule, not the exception.

Cardiopulmonary Resuscitation↗
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A survey of first-responder firefighters' attitudes, opinions, and concerns about their automated external defibrillator program.

OBJECTIVE: To identify barriers to first-responder automated external defibrillator (AED) use by determining firefighter attitudes, opinions, and concerns about their AED program. METHODS: An anonymous survey was mailed to all firefighters in a municipal department that had had first-responder defibrillation for more than two years. A follow-up survey was mailed to all nonrespondents. The survey requested firefighter demographics, comfort and experience with AED, definition of DOA (dead on arrival), and opinion of the program. RESULTS: Of 749 firefighters surveyed, 686 responded (92%). The respondents had an average of 12 +/- 8 years of experience; 66% felt very comfortable using the AED and 3% felt very uncomfortable. The respondents had applied an AED to a patient a median of 2 times (range 0-30); 24% had never applied an AED. Eighty-three percent reported they had been on the scene of an out-of-hospital cardiac arrest when their AED was not used for at least one patient. Predominant reasons for not applying an AED included the ambulance arrived "soon enough" (72%), the ambulance arrived first (63%), the patient was DOA (61%), and the patient had a do-not-resuscitate (DNR) order (32%). Eighty-one percent of the respondents correctly listed at least one clinical finding that defines DOA. Ninety-nine percent felt they should continue the AED program. The respondents gave numerous suggestions for improving the program, including being able to visualize the rhythm, increasing their level of care, and improved AED training. CONCLUSIONS: Municipal first response firefighters view their AED program favorably despite infrequently applying an AED. The appropriateness of withholding defibrillation because a secondary response unit will arrive "soon enough" should be reviewed. The definition of DOA should be reviewed to ensure that viable patients are not denied defibrillation.

Attitude of Health Personnel↗
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The effect of an 18-hour electrical power outage on an urban emergency medical services system.

OBJECTIVES: To describe the experience of an urban, commercial ambulance provider during the multistate August 2003 electrical power outage (EPO) and to identify how such an event can affect an emergency medical services (EMS) system. METHODS: Data were abstracted from all dispatch and prehospital medical records generated during the 18-hour EPO. An hour-by-hour comparison was made between the median number of hourly EMS dispatches during the month of August 2003 and the total number of hourly EMS dispatches during the EPO. Presenting complaints were categorized, and all calls related to the EPO were identified. RESULTS: During the first ten hours of the EPO, hourly call volume increased an average of 250% (range 50%-500%) as compared with all of August 2003. The greatest increase in call volume occurred during the first seven hours of the EPO. During the EPO, 16% (n = 13) of patients presented with a heat-related complaint precipitated by the failure of air conditioning. In the same period, 37% (n = 31) of patients presented with a respiratory-related complaint, 52% (n = 16) of which were precipitated by the failure of home respiratory equipment such as ventilators, nebulizers, and oxygen concentrators. During the EPO, the average time spent on scene with patients increased 63%, from 11 to 18 minutes, when compared with the time spent 16 hours immediately prior and 14 hours immediately after the EPO. Average response and transport times did not change. CONCLUSION: Loss of power can cause a dramatic but short-term increase in call volume and lead to a disaster-like situation. EMS resources may be conserved by proactively assisting patients with home medical devices before they develop emergent conditions. Such a patient population might benefit, for example, from home deliveries of portable oxygen tanks or from the creation of temporary facilities that provide a climate-controlled environment and electrically powered medical devices.

Air Conditioning↗
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Validation of using EMS dispatch codes to identify low-acuity patients.

OBJECTIVE: To validate the predictive ability of previously derived emergency medical services (EMS) dispatch codes to identify patients with low-acuity illnesses. METHODS: This prospective descriptive study was conducted in Rochester, New York. An expert panel reviewed and modified a previously derived set of low-priority EMS dispatch codes. Patients assigned these 21 codes between July 2002 and June 2003 were included for further analysis. Dispatch data and level of EMS care were recorded for each dispatch code. The proportion of low-acuity patients (i.e., those who received only basic life support (BLS) care or those who were not transported using lights and sirens) was determined using previously established definitions. Codes were defined as associated with low-acuity patients if the lower bound of the 95% confidence interval (CI) exceeded 90%. Medical records for patients identified as high-acuity were reviewed to evaluate whether the advanced life support (ALS) level care that was provided had a clinical impact. RESULTS: Emergency medical services cared for 43,602 patients during the study, and 7,540 were dispatched as low-priority. We found that 7,197 (95%; 95% CI: 95-96%) of these patients met low-acuity criteria and that 11 of the evaluated codes were validated, with low-acuity care provided at least 90% of the time. Of the 343 patients identified as high-acuity, 62 (18%; 95% CI: 14-23%) were determined to have received interventions that had a clinical impact. CONCLUSIONS: This study prospectively validates 11 EMS dispatch codes as being associated with low-acuity patients. These codes could be used to triage EMS patients based on dispatch information.

Acute Disease↗
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Studies evaluating current field triage: 1966-2005.

The American College of Surgeons (ACS) field triage guidelines are used to determine which patients require prompt transport to a trauma center and which can be transported to a lower-level facility. The objective of this report was to conduct a literature review to determine the sensitivity and specificity of the ACS field triage criteria and each step of the criteria. The bibliographic database MEDLINE was used to conduct a literature search for relevant English-language articles published between 1966 and 2005. The search was conducted by combining the Medical Subject Headings (MeSH) "emergency medical services," "triage," and "wounds and injury." To ensure that the search was comprehensive, the reference sections of all selected articles were searched for additional relevant references and searches by other organizations were reviewed to identify additional relevant articles. The MEDLINE search identified 542 titles. The author reviewed the titles, and 107 abstracts were selected for further review. Through the MEDLINE search, the reference section review, and the review of other searches, 80 articles were identified as relevant. Of those, five studies evaluated the full ACS criteria. Two of these calculated the specificity (8%) and/or sensitivity (95%-97%) of the ACS criteria. The remaining studies looked at the percentage of patients transported or admitted to a trauma center. Three studies looked at the predictive value of the physiologic step, and one of these calculated the sensitivity (56%) and specificity (86%). Two studies specifically analyzed the anatomic step. One of these calculated the sensitivity (45%). This search found that there is insufficient evidence to support the overall ACS field triage criteria. However, of the various steps, the physiologic and anatomic steps had the best evidence to support them.

Humans↗
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Derivation of emergency medical services dispatch codes associated with low-acuity patients.

OBJECTIVE: To identify emergency medical services (EMS) dispatch codes associated with basic life support (BLS) level of prehospital care, a proxy for low illness acuity. METHODS: This retrospective cohort study was conducted in an urban city with a single advanced life support level EMS provider. The 911 center was certified in using dispatch protocols from Priority Dispatch Corporation (Salt Lake City, UT). Dispatch data on all transported EMS patients from August 2001 to April 2002 were abstracted. The authors prospectively defined a low-acuity patient as one who received BLS-level care and defined a low-acuity dispatch code as one in which at least 90% of coded patients required only BLS care. For each dispatch code or code group, the authors calculated the fraction of patients who received BLS-level care. For each "A"-level (lowest category) dispatch code group, the fraction of patients receiving BLS-level care was also evaluated. RESULTS: A total of 19,332 calls met inclusion criteria and were categorized into 118 dispatch codes or code groups. Twenty-eight codes or code groups with 7,801 patients met the authors' definition of low acuity. Overall, 7,394 patients received only BLS care (94.8%, 95% confidence interval: 94.3%-95.3%). Analysis of "A"-level dispatch code groups found BLS use rates of 52.8% to 99.3%. CONCLUSIONS: Certain dispatch codes are associated with the delivery of BLS-level care, indicating identification of patients likely to be low acuity. These codes are not necessarily "A"-level dispatch codes, which are commonly considered to represent the lowest-acuity patients. Future studies are needed to prospectively validate that these codes do represent low-acuity patients.

Acute Disease↗
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A comparison of first-responder automated external defibrillator (AED) application rates and characteristics of AED training.

OBJECTIVE: To determine whether there were associations between the characteristics of first-responder automated external defibrillator (AED) training and AED application rates. METHODS: This multicenter retrospective cohort study analyzed data from ten emergency medical services systems where first responders were trained and equipped with AEDs. Data were provided for all out-of-hospital cardiac arrests (OHCAs) occurring over two years, including whether the first-responder AED was applied (pads attached to patient). Systems were surveyed to determine the characteristics of their initial and continuing AED training. Data were analyzed using odds ratios (ORs) with 95% confidence intervals (95% CIs). RESULTS: Overall, the first-responder AED was applied to 53% of 2,181 OHCAs. First responders applied AEDs to 60% of OHCAs when a national AED training curriculum was used and to 49% of OHCAs when a locally created curriculum was used (OR=1.58; 95% CI=1.32-1.88). First responders applied AEDs to 61% of OHCAs when they were trained to the level of Certified First Responder or higher and to 28% of OHCAs when they were trained only in cardiopulmonary resuscitation (OR=3.97; 95% CI=3.20-4.93). First responders applied AEDs to 66% of OHCAs when they each had an opportunity to apply the AED during continuing training and to 17% of OHCAs when they did not have this opportunity (OR=9.04; 95% CI=7.15-11.42). First responders applied AEDs to 59% of OHCAs when they had not received continuing training within one year of their initial training and to 42% of OHCAs when they had received continuing training in the first year (OR=2.00; 95% CI=1.67-2.40). CONCLUSION: Use of a national AED training curriculum, training to the level of Certified First Responder or higher, and the ability for each first responder to apply the AED during continuing training were associated with higher AED application rates. Continuing training within the first year did not appear to be as important as actually using the AED during the training.

Advanced Cardiac Life Support↗
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Linkages of acute care and EMS to state and local public health programs: application to public health programs.

Response to terrorism and mass casualty incidents has become a focal point for many public service agencies. Public health agencies and the emergency response community must work together to effectively and efficiently respond to any future incidents. Historically, collaboration has been a challenge since these agencies have functioned independently from one another, maintaining separate infrastructures that are not adequately interoperable. This article will summarize the consensus achieved during a meeting of multidisciplinary stakeholders held to discuss linkages between acute care, emergency medical services, and public health. The relevancy of these findings to public health, as well as the benefits from development of an interoperable infrastructure to public health, will be opined.

Bioterrorism↗