Prehospital Therapy Past, Present, and Future

Racial and Ethnic Patterns in the Utilization of Prehospital Emergency Transport Services in the United States

Introduction:

This descriptive research used a large, urban population-based data set for prehospital emergency medical transports to examine racial/ethnic patterns of access and utilization for several broad categories of emergency medical transport services.

Methods:

Fire department files of approximately 39,000 reports on service provision were used to establish rates of transport utilization per 1,000 population in 1990, the most recent year for which reliable citylevel census data were available. Data were categorized by three age groups (< 25 years 25–64years,≥ 65years), three racial/ethnic groups (non-Hispanic whites, African-Americans, Hispanics), and gender. Transport rates were computed for total utilization, trauma incidents, and incidents due to medical conditions. Racial/ethnic rates were analyzed for each age and gender group and age- and gender-standardized rates were analyzed and presented in a graphical comparison. Statistical analyses of racial/ethnic differences were conducted using Tukey-type tests of multiple comparisons of proportions, with significant differences evaluated at the p = 0.001 level of significance.

Results:

Significant differences between racial/ethnic groups in the utilization of emergency transport services existed for all pair-wise comparisons including comparisons by each of the three age groups and gender. For total utilization, unadjusted rates are highest for African-Americans (65.9/1,000) and lowest for Hispanics (25.8/1.000). Likewise, African-American rates were substantially higher for both gender groups and across all age groups. Categorized by gender and age group under age ≥ 65 years, non-Hispanic whites are observed to have the lowest rates for both males and females under the age 65 years, while Hispanics have the lowest rates in the group 65 years old However, when rates are age- and gender- standardized, compared to African-Americans and Hispanics, rates for non-Hispanic whites are significantly lower for total transports and for trauma and medically related transports (p = 0.001).

Conclusion:

Age- and gender- standardized rates for emergency medical transport were found to be lowest for non-Hispanic whites, moderately higher for Hispanics, and subsantially higher for African-Americans, who experienced transport rates nearly three times higher than were the rates for non-Hispanic whites. Further research is required to establish the extent to which racial/ethnic differences observed in this geographically restricted study reflect variations between racial/ethnic groups in the underlying need for services.

Prehospital management of rapid atrial fibrillation: recommendations for treatment protocols

The present study was completed to establish an epidemiological database defining prehospital rapid atrial fibrillation (RAF) and interventions given such patients in the hope of developing recommendations for further treatment protocols. On review of 4,749 paramedic run reports from a low-volume urban emergency medical services (EMS) system, 33 persons (0.69%) presented with RAF. Data collected included vital signs/ventricular rate, patient age, ambulance field times, patient chief complaint, prehospital interventions, efficacy of interventions, additional cardiac rhythms, iatrogenic complications, and patient past medical history. Neither intravenous (IV) diltiazem or electrical cardioversion were used within the 12-month period of this study. Symptomatic/supportive care consisting of observation (72.73%) and interventions (27.27%) with nitroglycerine, furosemide, aspirin, morphine, and/or IV fluid bolus therapy accounted for all prehospital treatment. Paramedics documented improvement in 100% of patients. No cases occurred in which RAF resulted in severe hemodynamic instability. No inappropriate use, point estimate (PE) [(0)/(33) (0.00% to 10.60%)], or unmet need, PE [(0)/(4,716) (0.00% to 0.08%)] of care was noted. The data presented in this study suggest that given similar EMS system characteristics, prehospital RAF is an infrequently encountered, predominantly hemodynamically stable cardiac arrhythmia, readily treatable with symptomatic/supportive care, and cautious observation. The prehospital application of adult advanced cardiac life support guidelines utilizing IV diltiazem and electrical cardioversion for the treatment of RAF may be unnecessary.

Model curriculum in emergency medical services for emergency medicine residency programs. SAEM Emergency Medical Services Committee

An emergency medical services (EMS) curriculum, as developed by the SAEM Emergency Medical Services Committee, is provided for the training of emergency medicine residents in EMS.

Does the level of prehospital care influence the outcome of patients with altered levels of consciousness?

HYPOTHESIS

Significant differences exist in the outcome of patients with altered level of consciousness (ALOC) cared for by advanced life support (ALS) compared with basic life support (BLS) prehospital providers.

METHODS

Patients transported by ambulance to a community teaching hospital during an 11-month period were studied retrospectively. Study patients were those considered not alert by prehospital personnel. Exclusion criteria included; trauma, intoxication, drowning, shock, and cardiac arrest. Data were abstracted from the ambulance reports and hospital records.

RESULTS

Two hundred three patients with an ALOC were identified; 113 were transported by ALS providers (56%) and 90 (44%) by BLS providers. Prehospital levels of consciousness, according to the "alert, verbal, painful, unresponsive" scale (ALS vs BLS) were: "verbal" (40% vs 51%), "painful" (23% vs 23%), and "unresponsive" (37% vs 25%). The mean value for some time was 15 +/- 6 minutes for ALS versus 10 +/- 4 minutes for BLS (p < 0.001). On arrival in the emergency department, the LOC of 72 (64%) ALS patients and 58 (64%) BLS patients had improved to "alert." The level of consciousness in one ALS patient worsened. Fifty-two ALS (46%) and 38 (42%) BLS patients were admitted. Principal final diagnoses were seizure (27% ALS vs 38% BLS), hypoglycemia (23% ALS vs 23% BLS), and stroke (22% ALS vs 20% BLS). Remaining diagnoses each constituted less than 7% of total discharge diagnoses. No statistically significant differences in measures of outcome were noted between ALS or BLS patients. Diagnoses of seizure, stroke, and hypoglycemia were studied individually. No differences in admission rate, mortality rate, or disposition were identified. Hypoglycemic patients conveyed by ALS providers had significantly shorter emergency department treatment times than did those transported by BLS providers (160 +/- 62 minutes ALS vs 229 +/- 67 minutes BLS [p < 0.005]).

CONCLUSION

Advanced life support levels of care of patients with an ALOC does not significantly change outcome compared with those receiving BLS care with the exception of shorter emergency department treatment times for hypoglycemic patients.

Using interactive videodisc to test advanced airway management skills

PURPOSE

To evaluate the effectiveness of the Actronics Interactive Learning System to teach the psychomotor skills of advanced airway management compared to the traditional method of lecture/demonstration.

METHODS

The study was a nonrandomized, nonequivalent comparison group design of a convenience sample of 86 American Heart Association (AHA), advanced cardiac life support (ACLS) students, who obtained instruction in airway management by the interactive videodisc (IVD) learning system (n = 41), or by the traditional method of demonstration/return demonstration (n = 45). The evaluation criteria for the students were based on the number of attempts required to perform successfully endotracheal (ET) intubation and esophageal obturator airway (EOA) insertion.

RESULTS

No statistically significant differences in the performance of ET insertion between the IVD and the traditional method of instruction could be demonstrated. However, initial certifiers for ACLS learning EOA insertion by the IVD method had a treatment effect (p = 0.004) compared to ACLS students learning by the traditional method. This treatment effect was not noted with ET intubation and EOA insertion for students seeking recertification. In a post-test satisfaction questionnaire, 34 IVD students reported satisfaction with learning airway management using this instructional method, but also expressed a preference to have an ACLS instructor available.

CONCLUSION

This study highlights the role of IVD in teaching the complex skills of advanced airway management.

Incorporating drugs and devices into emergency medical services systems

The proliferation of new medical technology and pharmacology forces the medical community to ensure the efficacy and safety of new drugs and devices before their use in patient care. Although traditional medical practices have a fairly consistent means to achieve this end, prehospital medical practice often does not. In addition, it often appears that the emergency medical services marketplace does not always follow conventional supply/demand and cost/quality paradigms. This article describes a process implemented in Pennsylvania to standardize the mechanism by which new drugs and devices are introduced into prehospital medical practice.

The 1989 Loma Prieta earthquake: issues in medical control

INTRODUCTION

The role of the base-hospital and on-line medical control in a disaster has not been investigated previously. This study assesses the roles of base-hospitals and the value and feasibility of on-line medical control during the 1989 Loma Prieta earthquake.

METHODS

The researchers studied five Bay Area counties most affected by the earthquake: San Francisco, Alameda, San Mateo, Santa Clara, and Santa Cruz. Researchers sent questionnaires to all 1,498 registered EMTs and paramedics in these counties; 620 were returned (41.4%). Respondents answered questions about activities performed, contacts with base-hospitals and other agencies, and problems encountered the night of the earthquake. Researchers selected 63 paramedics for in-depth interviews based on their performance of significant advanced life support (ALS) activities performed during the disaster. The coordinators of the 13 base-hospitals (BHCs) in the region also received and returned questionnaires about medical control, base-hospital roles during the disaster, and problems encountered. Researchers interviewed all five county emergency medical services (EMS) agency directors.

RESULTS

The surveys of EMS directors, base-hospital coordinators, and paramedics indicate that confusion existed over the status of medical control after the earthquake. There was general agreement among base-hospital coordinators (BHCs) that suspension of medical control is appropriate in a major disaster. Three bases had appropriate equipment to function as back-up dispatch centers. Eight bases had adequate personnel, but only one BHC felt his personnel had adequate training to function in a dispatch capacity. Nine paramedics did not start or continue resuscitation on patients whom they ordinarily would have begun resuscitation.

CONCLUSION

Emergency medical services should suspend medical control immediately following a major disaster and ensure that all prehospital and base personnel are notified. Disrupted communications protocols for prehospital personnel should reflect the skill and knowledge level of paramedics and the need for rapid, advanced practice in a disaster. Disaster planners should consider other roles for base hospitals in major disasters.

Prehospital misidentification of tachydysrhythmias: a report of five cases

Identification and treatment of tachydysrhythmias is an important element of prehospital care. Five cases of prehospital misidentification of tachydysrhythmias are presented to highlight the challenges and pitfalls of field management. The literature is reviewed and discussed in light of new therapies and technology. Guidelines for patient subgroups potentially benefitting from on-line medical control and biotelemetry are explored.

Invasive airway techniques in resuscitation

Although endotracheal intubation is still the most definitive technique for airway management in patients with cardiac or respiratory arrest, in some emergency care systems, use of endotracheal intubation by prehospital care personnel has been restricted by policy or statute. Therefore, alternative airway devices have been developed. These alternative airway devices include the Esophageal Obturator Airway (EOA) and Esophageal Gastric Tube Airway (EGTA), the Pharyngeotracheal Lumen Airway (PTL), and the Esophageal-Tracheal Combitube (ETC). By examining the available literature concerning these alternative airway devices, we sought to determine 1) if these devices are superior to basic, noninvasive airway techniques (eg, bag-valve-mask ventilation); 2) if they are comparable to endotracheal intubation in terms of ventilation, oxygenation, and potential complications; 3) what the role of these devices should be in prehospital care; and 4) what the best recommendations should be regarding these devices in terms of resuscitation training and future areas for research. The review involved a total of 837 EOA/EGTA, 304 PTL, and 159 ETC study patients. Although ventilation and oxygenation can, in some circumstances, be as good with the EOA/EGTA devices as it is with the endotracheal intubation, in some cases they can be inadequate, and the complication rate is relatively high. Preliminarily, the PTL and the ETC seem to provide adequate ventilation and oxygenation with few complications. However, for both devices, published clinical experience, especially in the prehospital setting, is still limited. Therefore, their use should be left to the discretion of accountable physician directors of applicable resuscitation teams. Regardless of the device used, recognition of proper placement remains the most important aspect of using any invasive airway device. Therefore, proper training and expert medical supervision probably have more influence on the successful use and impact of these devices than any other factors related to the devices themselves. Future training efforts would be most useful if directed at proper endotracheal intubation training and development of improved basic ventilatory skills. Nevertheless, additional controlled, direct-comparison studies of the PTL and ETC devices are recommended and should be conducted in properly supervised emergency medical services systems.