Trauma care regionalization: a process-outcome evaluation

A Systematic Review and Meta-Analysis Comparing Outcome of Severely Injured Patients Treated in Trauma Centers Following the Establishment of Trauma Systems

BACKGROUND

The establishment of trauma systems was anticipated to improve overall survival for the severely injured patient. We systematically reviewed the published literature to assess if outcome from severe traumatic injury is improved for patients following the establishment of a trauma system.

METHODS

A systematic literature review of all population-based studies that evaluated trauma system performance was conducted. A qualitative analysis of each study's design and methodology and a meta-analysis was performed to evaluate the evidence to date of trauma system effectiveness.

RESULTS

A search of the literature yielded 14 published articles. Trauma systems demonstrated improved odds of survival in 8 of the 14 reports. The overall quality-weighted odds ratio was 0.85 lower mortality following trauma system implementation.

CONCLUSIONS

The results of the meta-analysis showed a 15% reduction in mortality in favor of the presence of a trauma system. Evaluation of trauma system effectiveness must remain an uncompromising commitment to optimal outcome for the injured patient.

Transfer times to definitive care facilities are too long: a consequence of an immature trauma system

OBJECTIVE

The purpose of this study was to review our experience with interfacility transfers to identify problems that could be addressed in the development of a statewide trauma system.

BACKGROUND

The fundamental tenet of a trauma system is to get the right patient to the right hospital at the right time. This hinges on well-defined prehospital destination criteria, interfacility transfer protocols, and education of caregivers. Patients arriving at local community hospitals (LOCs) benefit from stabilization and transfer to trauma centers (TCs) for definitive care. However, in the absence of a formalized trauma system, patients may not reach the TC in a timely fashion and may not be appropriately treated or stabilized at LOCs prior to transfer.

METHODS

Our facility is a level I TC and regional referral center for a compact geographic area without a formal trauma system. The Trauma Registry was queried for adult patients admitted to the trauma service between January 1, 2001 and March 30, 2003. Patients were divided into 2 groups: those received directly from the scene (DIR) and those transferred from another institution (TRAN). Medical records were reviewed to elucidate details of the early care. Data are presented as mean +/- SEM. Continuous data were compared using Student t test, and categorical data using chi2. Transfer times were analyzed by one-way ANOVA.

RESULTS

A total of 3507 patients were analyzed. The TRAN group had a higher Injury Severity Score (ISS) (17.5 versus 11.0, P < 0.05), lower Glasgow Coma Score (GCS) (13.3 versus 14.1, P < 0.05), lower initial systolic blood pressure (SBP) (130 versus 140, P< 0.05), and higher mortality (10% versus 79%, P < 0.05) than the DIR group. The average time spent at the LOC was 162 +/- 8 minutes. The subgroup of patients with hypotension spent an average of 134 minutes at the LOC, often receiving numerous diagnostic tests despite unavailability of surgeons to provide definitive care. Severe head injury (GCS = 3) triggered more prompt transfer, but high ISS was underappreciated and did not result in a prompt transfer in all but the most severely injured group (ISS > 40). Some therapeutic interventions were initiated at the LOCs, but many were required at the TC. A total of 23 (8%) TRAN patients required critical interventions within 15 minutes of arrival; mortality in this group was 52%. Mortality among those requiring laparotomy after transfer was 33%.

CONCLUSIONS

All but the most severely injured patients spend prolonged periods of time in LOCs, and many require critical interventions upon arrival at the TC. It is unreasonable to expect immediate availability of surgeons or operating rooms in LOCs. Thus, trauma system planning efforts should focus on 1) prehospital destination protocols that allow direct transport to the TC; and 2) education of caregivers in LOCs to enhance intervention skill sets and expedite transfer to definitive care.

The association between trauma system and trauma center components and outcome in a mature regionalized trauma system

BACKGROUND

Regionalized trauma systems have been shown repeatedly to improve the outcome of seriously injured patients. However, we do not have data regarding which components of these systems have the most impact on outcome and to what degree. The objective of this study was to understand the association between various components that make up a trauma system and outcome.

METHODS

Surveys were administered to trauma directors at 59 hospitals in the province of Quebec, Canada. Data from the surveys were then linked with specific outcome variables obtained from a regionalized trauma database. Specific outcomes were assigned to trauma system- and in-hospital-based components after controlling for injury severity.

RESULTS

Over 4.8 years, 72,073 patients met inclusion criteria. Components found to affect survival after risk adjustment were prehospital notification (OR, 0.61; 95% CI, 0.39-0.94) and the presence of a performance improvement program in that hospital (OR, 0.44; 95% CI, 0.20-0.94). Increased patient volume was associated with a reduction in risk-adjusted mortality (OR, 0.98; 95% CI, 0.97-0.99). Tertiary trauma centers were also associated with a reduction in risk-adjusted mortality compared with both secondary and primary centers (OR, 0.68; 95% CI, 0.48-0.99).

CONCLUSIONS

Improvements in outcome in a regionalized trauma system are secondary to a combination of elements, as well as to the interplay of these elements on each other. Prehospital notification protocols and performance improvement programs appear to be most associated with decreased risk-adjusted odds of death.

Physiologic trauma triage criteria in adult trauma patients: are they effective in saving lives by transporting patients to trauma centers?

BACKGROUND

Trauma triage criteria have been in place for many years and were updated in 1999 by the American College of Surgeons. We are unaware of any studies that have directly examined the ability of these criteria to reduce short-term mortality by transporting patients to trauma centers rather than to noncenters.

STUDY DESIGN

Retrospective observational cohort study of adult patients meeting physiologic triage criteria who were transported to 9 regional (Level I) trauma centers, 21 area (Level II) trauma centers, and 119 noncenters in New York in 1996 to 1998. For each triage criterion and for one or more of the criteria, odds ratios and their confidence intervals for mortality in regional and area trauma centers versus noncenters and odds ratios and their confidence intervals for mortality in regional centers versus area centers and noncenters were used to measure performance.

RESULTS

Patients in regional trauma centers had considerably lower mortality than patients in area trauma centers and noncenters for two individual triage criteria and for patients with one or more triage criteria (odds ratio, 0.75; 95% CI, 0.63-0.90 for one or more criteria). Also, patients with head injuries who were treated in regional centers had notably lower mortality than patients in other hospitals (odds ratio, 0.67; 95% CI, 0.53-0.85).

CONCLUSIONS

In New York, regional trauma centers exhibit considerably lower mortality than area trauma centers or noncenters for adult patients meeting specific physiologic triage criteria. It is important that population-based trauma systems with data from centers and noncenters be developed for the purpose of evaluating and redesigning trauma systems.

Einfluss von Rettungsmittel und Zielklinik auf die Letalität nach Polytrauma

BACKGROUND

The aim of this study was to document the present knowledge from the medical literature on (1) efficacy of aeromedical evacuation (helicopter emergency medical service, HEMS) and (2) influence of the level of the first receiving hospital on mortality of patients.

METHODS

Systematic review of the literature between 1970 and 2003; identification of studies with an evidence level of at least III and included control group; own results.

RESULTS

(1) 17 studies concerning the efficacy of HEMS were included into the review. No single study yielded shorter rescue times with the use of HEMS. 11 of 17 studies showed a significantly higher survival rate (8.2 to 52%) with the employment of HEMS especially with mid-degree polytrauma. (2) All 6 relevant studies dealing with hospital level found a considerable lower mortality rate (19 to 42%) for patients treated primarily at a level 1 trauma center or comparable institution.

CONCLUSIONS

The analyzed studies showed a trend toward decreased mortality rates with the employment of HEMS. Considering the comparable hospital level and even longer rescue times with HEMS, these differences can be explained with higher quality of initial diagnosis and treatment of the HEMS rescue team. Furthermore, mortality rates can be lowered significantly through primary treatment at a level 1 trauma center. Thus, the more flexible choice of the first receiving hospital represents a specific, clinically relevant advantage of HEMS in emergency medicine.

Trauma bypass in south-eastern Sydney: An 8-year review

OBJECTIVE

The New South Wales (NSW) Health Department and the Ambulance Service of NSW introduced a trauma bypass system in Sydney on 29 March 1992. This study aims to review the outcomes of trauma bypass patients brought to St George Hospital, a major trauma service in south-eastern Sydney, and to assess the performance of the current prehospital trauma triage protocol.

METHODS

The St George Hospital Department of Trauma Services prospectively collected data on all trauma bypass patients for the 8-year period from 29 March 1992 to 29 March 2000.

RESULTS

A total of 1990 patients were brought to hospital on trauma bypass. The average age was 32 years, 70% were men and 66% were from road traffic accidents. The positive predictive value of the prehospital triage tool for serious injury (Injury Severity Score [ISS] > 15) was 18.6% (95% CI 16.9-20.4). This is well below the benchmark previously established by the NSW Health Department Trauma System Advisory Committee. For all trauma bypass patients, 33.8% (95% CI 31.7-35.9) were discharged home from the ED. The overall death rate was 2.5% (95% CI 1.9-3.3).

CONCLUSIONS

According to the proposed benchmark, current prehospital trauma triage guidelines are underperforming. This suggests that a review of the benchmarks of current local trauma systems and of the trauma triage tool is required.

Auto launch/early activation: a survey of AAMS members and literature review

BACKGROUND

Rapid access to definitive care is a fundamental tenet of trauma care and forms the basis for current emergency medical and trauma systems. Helicopters offer expedited transport to trauma centers and can deliver advanced practice personnel to the scene of injury, but many systems do not dispatch air medical crews until after assessment by ground providers.

OBJECTIVES

Here we report data from the AAMS Auto Launch Survey and perform a literature review.

METHODS

A 7-question survey was developed by the AAMS Research Committee and approved by the board. An invitation to participate in the survey was sent by electronic mail to all current members. A link to an online survey was included. Results were presented descriptively. Some respondents were willing to share auto launch protocols, which were categorized into patient-related factors, event-related factors, and geographic considerations.

RESULTS

A total of 86 usable responses were recorded, which represented about a third of the 240 total AAMS members. Of these, 38 respondents (44.2%) routinely use auto launch. Just over half of those using early activation reported using a combination of event- and patient-related considerations; most also incorporating geographic criteria. About one-third of respondents auto launch only at the request of ground personnel, and about one-quarter use geographic criteria alone. Threshold distances ranged from 20 to 25 miles or 20 to 30 minutes by ground.

CONCLUSIONS

About half of respondents routinely use auto launch, although protocols are not consistent. Auto launch appears to offer a mechanism for decreasing EMS response times, but additional research is needed to help define optimal dispatch criteria.

The impact of pediatric intensive care unit volume on mortality: a hierarchical instrumental variable analysis

OBJECTIVE

To evaluate the relation between annual pediatric intensive care unit (PICU) admission volume and mortality.

DESIGN

Nonconcurrent cohort design.

SETTING

Pediatric patients included in the most currently available research database from the Pediatric Intensive Care Unit Evaluations (PICUEs).

PATIENTS

A total of 34,880 consecutive pediatric admissions to a contemporary volunteer sample of 15 U.S. PICUs.

MEASUREMENTS AND MAIN RESULTS

We conducted an instrumental variable analysis and adjusted for similarities between patients admitted to different PICUs using mixed-effects, hierarchical techniques. Case mix and severity of illness was adjusted for using patient-level data and the Pediatric Risk of Mortality, version III (PRISM III). On average, admission to higher-volume PICUs was associated with lower severity-adjusted mortality (odds ratio = 0.68 per 100 patient increase in volume; 95% confidence interval: 0.52-0.89) when volume was analyzed as a linear term; however, when PICU volume was analyzed as a quadratic term, we found the lowest severity-adjusted mortality rates among PICUs with annual admission volumes between 992 and 1,491. Furthermore, lower severity-adjusted mortality rates were primarily found among patients with less than a 10% PRISM III predicted risk of mortality.

CONCLUSIONS

Although there is an association between lower severity-adjusted mortality among higher volume PICUs, our data suggest that best outcomes are among mid- to large-sized PICUs. These data support minimum annual admission criteria for PICUs but raise the concern that PICUs with very high annual admission volumes may operate beyond an ideal capacity.

[Evaluation of costs incurred for patients with multiple trauma particularly from the perspective of the hospital]

The aim of this study was to evaluate the costs involved in treating severely injured patients at the clinic differentiated by several characteristics (injury, age), sectors (emergency room, surgery, intensive and normal care), and kinds of costs (fixed costs, variable costs) and to determine influencing factors regarding costs based on the register of the DGU (Deutsche Gesellschaft für Unfallchirurgie). All patients were taken into account who had an injury severity score (ISS) of at least 16. On this basis costs of 3702 patients were analyzed. They were compared by using analysis of variance for different groups of patients classified according to kind of injury, severity of injury, and age. Moreover, multiple regression was performed to control the common influence of demographic factors and the type of injury on costs. The average ISS of the analyzed patients was 30.6 (+/-11.6) points. The average costs of the clinic were 32,166 (+/-25,404) EUR per patient. More than half of the costs was incurred by intensive care and about one-fourth by surgery. On average 30.6% were variable costs and 69.4% were fixed costs. The analysis of variance revealed that costs increased with advancing age and severity of injury (ISS). Multiple regression confirmed these interrelations indicating that extremities are very cost intensive. Due to the high portion of fixed costs, the overall costs strongly depend on the capacity utilization and less on hospital stay. That is why it may be necessary in the future to create centers for trauma care to maintain economic efficiency for treatment of these patients. Besides large differences of costs within closely defined groups of patients, hospitals carry a high economic risk so that a more complex reimbursement system should be discussed than implemented by the German DRGs.

Acute traumatic injuries in rural populations

In the United States, injuries are the leading cause of death among individuals aged 1 to 45 years and the fourth leading cause of death overall. Rural populations exhibit disproportionately high injury mortality rates. Deaths resulting from motor vehicle crashes, traumatic occupational injuries, drowning, residential fires, and suicide all increase with increasing rurality. We describe differences in rates and patterns of injury among rural and urban populations and discuss factors that contribute to these differences.

Impact of between-hospital volume and within-hospital volume on mortality and readmission rates for trauma patients in California*

OBJECTIVE

Previous research assessing the impact of between-hospital trauma volume (high volume centers vs. low volume centers) and outcomes has been inconsistent. Furthermore, previous research has not considered temporal variations in within-hospital volume (a center having higher than average volume vs. lower than average volume) as a covariate. The objective of this study was to determine the relationship of between-hospital and within-hospital trauma volume and two measures of hospital quality of care.

DESIGN

Multivariable, hierarchical, mixed effects, logistic regression analyses of a population-based nonconcurrent cohort from 1995 to 1999.

SETTING

Thirty-nine nonfederal California hospitals included in the California Patient Discharge Data Set designated by local Emergency Medical Services authorities as adult trauma centers.

PATIENTS

All nonelderly adult trauma patients, 16-64 yrs (n = 54,352), and elderly adult trauma patients, >65 yrs (n = 47,656), admitted with an Injury Severity Score >9.

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Severity adjusted in-hospital mortality rate and 30-day trauma-related readmissions were analyzed. Among nonelderly adult patients, higher annual between-hospital trauma volume was not associated with mortality rate (odds ratio, 1.02 for each 100 admissions; 95% confidence interval, 0.99, 1.06) but was associated with higher risk of readmission (odds ratio, 1.19 for each 100 admissions; 95% confidence interval, 1.13, 1.26). Among elderly adult patients, higher annual between-hospital trauma volume was associated with lower mortality (odds ratio, 0.79 for each 100 admissions; 95% confidence interval, 0.71, 0.87) but was not associated with risk of readmission (odds ratio, 0.96 for each 100 admissions; 95% confidence interval, 0.90, 1.04). Higher than average monthly within-hospital trauma volume was associated with higher odds of readmission (odds ratio, 1.11 for a volume deviation of ten patients per month; 95% confidence interval, 1.01, 1.21) among elderly adult patients.

CONCLUSIONS

The findings of this study in the context of previous research suggest that relationships between trauma volume and outcomes exist but depend on which patient populations are studied and how the data are analyzed. Furthermore, trauma centers may be subject to the detrimental effects of high temporal volume overextending existing services and capacity. Since this study found that both between-hospital volume and within-hospital volume measures are associated with outcomes, we recommend that both measures be included in future volume-outcome investigations.

Association of Hospital Trauma Designation with Admission Patterns of Injured Children

BACKGROUND

Little is known about the influence of regionalization of trauma care on pediatric trauma care delivery. The purpose of this study was to estimate whether formal adoption of a statewide trauma system was associated with hospital admission patterns of injured children.

METHODS

A longitudinal study of children who were residents of Washington State during 1989 to 1999 was conducted. The main outcome measure was hospital admission for trauma.

RESULTS

During the 11-year period, there were 24,955 admissions. Admission rates of injured children to pediatric-designated trauma hospitals decreased by 20%, rates at adult-designated hospitals decreased by 60%, and rates at nondesignated hospitals decreased by 66%. Introduction of the trauma system in 1994 was associated with a 12% increase in admission rates to pediatric-designated hospitals, little change (+1%) in admission rates to adult-designated centers, and an 11% decrease in admissions at nondesignated hospitals.

CONCLUSION

Trauma designation in Washington was associated with a shift in admissions from nondesignated hospitals to pediatric trauma hospitals.

Implementation of a Trauma Care System: Evolution Through Evaluation

BACKGROUND

The regionalization of trauma services has been implemented in many health care systems and communities over the past 10 to 20 years. As these trauma systems mature and evolve, changes are made to improve the care and efficiency of the system. Trauma care regionalization was introduced in Quebec in 1993. This study looked at the evolution of trauma care in Quebec over the past 13 years, from the preregionalization era to the present.

METHODS

A retrospective review scientifically evaluated a trauma system, the implementation of evidence-based changes, and the efficacy of these changes.

RESULTS

Various changes have been made in the Quebec trauma system since the introduction of regionalization. These changes have led to an incremental decrease in mortality caused by severe trauma from 51.8% in 1992 to 8.6% in 2002.

CONCLUSION

A trauma system is fluid and constantly evolving. Research and constant reevaluation are necessary for continuous evaluation of the system and improvement of its outcomes and efficiency.

Trauma system development in North America

The concepts of organized trauma care, many of which originated in military medicine, have been proven effective in the civilian sector. A formal trauma system includes all phases of care from prehospital through rehabilitation. Although trauma centers assume the leadership role, in a truly inclusive system, all healthcare providers (prehospital providers, community hospitals, and trauma centers) have a defined role in providing care to patients with trauma. As a result, patients receive treatment at the appropriate institution, resources are allocated appropriately, and the clinical outcome is optimized. Such a system ideally is suited to the unique needs of the mass casualty scenario.

The use of telemedicine to provide pediatric critical care consultations to pediatric trauma patients admitted to a remote trauma intensive care unit: a preliminary report

OBJECTIVE

Injured pediatric patients in remote communities are often cared for at trauma centers that may be underserved with respect to pediatric specialty services. The objective of this study is to describe a pilot telemedicine project that allows a remote trauma center's adult intensive care unit to obtain nontrauma, nonsurgical-related pediatric critical care consultations for acutely injured children.

DESIGN

Nonconcurrent cohort design.

SETTING

A remote, level II trauma center's shock-trauma intensive care unit and a tertiary care children's hospital pediatric intensive care unit.

PATIENTS

Analyses were conducted on cohorts of pediatric trauma patients (<16 yrs) consecutively admitted to the remote adult intensive care unit, including historical control patients and patients who received and did not receive telemedicine consultations.

INTERVENTIONS

Telemedicine consultations were obtained at the discretion of the remote intensive care unit provider for nontrauma, nonsurgical medical issues.

MEASUREMENTS AND RESULTS

The Injury Severity Score and Trauma and Injury Severity Score were used to assess severity of injury and predicted mortality rates, respectively, for the patient cohorts. Parental and provider satisfaction with the telemedicine consultations was also described. Thirty-nine consultations were conducted on 17 patients from the 97 pediatric patients admitted during the 2-yr study. Patients who received consultations were younger (5.5 yrs vs. 13.3 yrs, p <.01) and were more severely injured (mean Injury Severity Score = 18.3 vs. 14.7, p =.07). Severity-adjusted mortality rates were consistent with Trauma and Injury Severity Score expectations. Satisfaction surveys suggested a high level of provider and parental satisfaction.

CONCLUSIONS

Our report of a trauma intensive care unit based pediatric critical care telemedicine program demonstrates that telemedicine consultations to a remote intensive care unit are feasible and suggests a high level of satisfaction among providers and parents.

A geographic information system simulation model of EMS: reducing ambulance response time

Response time is a very important factor in determining the quality of prehospital EMS. Our objective was to model the response by Israeli ambulances and to offer model-derived strategies for improved deployment of ambulances to reduce response time. Using a geographic information system (GIS), a retrospective review of computerized ambulance call and dispatch logs was performed in two different regional districts, one large and urban and the other rural. All calls that were pinpointed geographically by the GIS were included, and their data were stratified by weekday and by daily shifts. Geographic areas (polygons) of, at most, 8 minutes response time were simulated for each of these subgroups to maximize the timely response of calls. Before using the GIS model, mean response times in the Carmel and Lachish districts were 12.3 and 9.2 minutes, respectively, with 34% and 62% of calls responded within 8 minutes. When ambulances were positioned within the modeled polygons, more than 94% of calls met the 8-minute criterion. The GIS simulation model presented in this study suggests that EMS could be more effective if a dynamic load-responsive ambulance deployment is adopted, potentially resulting in increased survival and cost-effectiveness.

Impact of transfer delays to rehabilitation in patients with severe trauma

OBJECTIVE

To measure the effect on rehabilitation outcomes of administrative delays in transferring patients from a level I trauma center to inpatient rehabilitation.

DESIGN

Retrospective cohort study.

SETTINGS

Level I trauma center and an inpatient rehabilitation center in Quebec, Canada.

PARTICIPANTS

A total of 289 patients with severe trauma admitted to inpatient rehabilitation from a level I trauma center between 1994 and 1999.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Length of stay (LOS) in rehabilitation, motor and cognitive function at discharge from rehabilitation, interruptions in rehabilitation, and disposition at discharge.

RESULTS

Shorter administrative delays were associated with shorter rehabilitation LOS (P<.01) improved cognitive function (P=.02) and had a negative but statistically nonsignificant association with motor function at discharge. No effect was observed for rehabilitation interruptions or dispositions at discharge.

CONCLUSIONS

Transferring trauma patients more quickly to inpatient rehabilitation can affect rehabilitation outcomes positively. It can also lead to an economy of resource use in both acute and rehabilitation settings.

Impact of American College of Surgeons verification on trauma outcomes

OBJECTIVE

The purpose of this study was to compare the impact of trauma patient outcomes before and after Level II American College of Surgeons (ACS) verification was received in a not-for-profit community hospital.

METHODS

This was a retrospective analysis of hospital discharge data for timeframes before and after Level II ACS verification was conducted. Originally, 8,674 patients were identified using the International Classification of Diseases, 9th Revision codes for trauma. These data were parsed to 7,811 patients by using International Classification of Diseases, 9th Revision codes 800 xx through 959.9 x, which signify an admitting diagnosis of trauma; 3,835 of the patients were admitted after the July 28, 1998, verification date. Blunt injuries constituted the vast majority of the patients (n = 7,488). Outcome measures studied included changes in length of stay (LOS), mortality, and total cost. Internal control was coronary artery bypass graft patients at the same hospital, and external control was trauma patients at a non-ACS hospital over the same time period. Data are presented with p values and SE and the ratio of observed/expected values on the basis of the all-payer severity-adjusted diagnosis-related group severity model.

RESULTS

The two timeframes exhibited statistically different outcomes in several variables. Adjusting for severity postverification, LOS was 10% less (p < 0.000). Similarly, severity-adjusted mortality observed/expected ratios were significantly different: 0.81 before versus 0.59 after (p < 0.000). The severity-adjusted ratio of costs found that the postverification era was 5% lower (p < 0.000). The contribution margin of the trauma patient population to the hospital well exceeded any postverification costs. Both control groups exhibited no significant changes in their severity-adjusted outcomes, which could have invalidated these results.

CONCLUSION

This study suggests that the efforts and resources consumed achieving ACS Level II trauma center verification appear to result in desired outcomes as evidenced by decreased LOS, reduced in-hospital mortality rates, reduced cost, and improved contribution margins.

Adopting the pre-hospital index for interfacility helicopter transport: a proposal

BACKGROUND

Interfacility helicopter transport is expensive without proven outcome benefit in trauma patients. Our objectives were to determine the fastest method of rural to urban interfacility transport, and develop a triage tool to identify patients most in need of rapid transport.

METHODS

Retrospective cohort study. Adults ISS > or = 12 transported from January 1996 to December 1998. Transport time variables were compared between geographical zones. A pre-transport index (PTI) identified two patient cohorts in which outcome was assessed.

RESULTS

Air ambulance was faster than ground transport, with helicopter overall superior to fixed-wing (< 225 km range). Seventy-two percent of patients with PTI < 4 (n = 196) had no outcome indicating severe injury versus 29% of the PTI > or = 4 cohort (n=151). Mortality for PTI<4 was 1.4% versus 22% for PTI > or = 4.

CONCLUSION

Interfacility helicopter transport of severely injured rural trauma patients was the overall fastest method within a 225 km range. PTI > 4 identifies patients most in need of this fast but expensive method of transport.

Pediatric trauma systems

The origins of trauma systems in the United States date to the 1960s when physicians returning from wars abroad realized that lessons learned from managing military casualties could be applied to civilian traumatic injury. Over the next several decades, trauma centers and then trauma systems began to be developed in an attempt to improve prehospital and acute care for these patients. Although studies of trauma system effectiveness are fraught with methodologic difficulties, several types of studies (panel reviews of preventable deaths, registry studies, and population-based studies), suggest that there may be improvements in mortality when trauma systems are established. Further study needs to focus on other outcomes than mortality, such as return to function after rehabilitation. Pediatric trauma systems have by necessity developed within the "adult" systems in place. The history of pediatric system development and studies assessing outcomes are also discussed. Continued system development, assessment, and educational efforts about how childhood injuries are different are essential to combat this leading killer of children.

Analysis of prehospital transport of head-injured patients after consolidation of neurosurgery resources

OBJECTIVES

Consolidation of neurosurgical (NS) services resulted in emergency medical services guidelines mandating transport of head-injured patients to the NS center if the Glasgow Coma Scale score is < 14 and prehospital index is > 3. This study determined what paramedic, system, or patient factors were associated with secondary head-injury transfer.

METHODS

This study was a retrospective chart review from January 1996 to November 1998.

RESULTS

Ninety-one patient charts were reviewed. The median transport delay to the NS site was 4 hours 22 minutes. After transfer, 79 (96%) patients were admitted, 25 (30%) underwent craniotomy, and 18 (22%) died. The final diagnosis in 35 (43%) cases was subdural hematoma. Triage guidelines were violated in five patients (6%) and the NS center was on diversion in three (4%) cases. Most delays were related to patient presentations; 17 (21%) patients had no history of head trauma.

CONCLUSION

Unpredictable patient factors were the most frequent reasons patients required secondary transfer; few protocol violations or system factors were identified. No modifications to the current NS triage criteria are recommended.

[Content validity of an information system used for head injury rehabilitation based on an analysis of medical records]

OBJECTIVE

This study examines the content validity of the TCC-Québec Information System based on an analysis of rehabilitation medical records. The goal was to determine the agreement between the variables of the TCC-Québec Information System identified by experts and based on an extensive literature review and those found in medical records.

METHOD

The medical records of 82 adults with a head injury were reviewed. The individuals had been hospitalized from 1997 to 1998 at three different acute care facilities or three rehabilitation centers. The abstractor determined if the information pertaining to a variable (e.g. personal history, impairments, or disabilities relating to sensori-motor function) was present in the record. A standardized and reliable procedure was used to ensure the quality of data extraction. The percentage of variables found in the medical records and the number of records in which each variable was documented were calculated for each clinical setting (acute care or rehabilitation) and for the different geographical regions.

RESULTS

The results suggest that a large discrepancy exists between what experts desired to be included in the information system and what is really documented clinically. No discrepancy exists between the different regions. Only 23% of variables were found in more than 70% of records.

CONCLUSION

This study provides recommendations about the most relevant variables to be included in an information system based on clinicians'information needs and the clinical reality. As such, these results should facilitate the use and implementation of the information system under study.

Relative importance of designation and accreditation of trauma centers during evolution of a regional trauma system

BACKGROUND

Improved survival after injury has been demonstrated with trauma system implementation and designation of trauma centers. Local designating health authorities or national verification (United States) or accreditation (Canada) programs audit trauma center performance. The relative importance of designation versus accreditation with respect to improved outcomes is not clear. The purpose of this study was to measure outcomes within a single regional trauma system after designation of trauma centers and to compare outcomes in the one accredited center to the nonaccredited centers.

METHODS

Data from three trauma centers were studied. All were large, university-affiliated regional medical centers, integrated into a regional trauma system and served by a single ambulance service. The study period was 1992 to 1999, immediately after trauma center designation in 1991. The British Columbia Trauma Registry was used to identify trauma patients, mechanism of injury, length of stay, case mix, case volume, acuity, pediatric caseload, and proportion of transfers at each center. A questionnaire was circulated to each hospital to determine the level of institutional support and programmatic development for trauma. The Trauma Registry was used to calculate z scores (TRISS methodology) for each center and TRISS-adjusted mortality odds ratios between institutions. Differences in covariables were controlled for in subgroup analysis.

RESULTS

Two centers (hospitals A and C) had a high trauma caseload; one (hospital B) had a small and diminishing caseload. Only one center (hospital A) developed a trauma program consistent with Canadian accreditation criteria; z scores for center A were consistently better than at hospital B or C and survival odds ratios were significant. This finding applied to the total trauma population, blunt adult trauma patients (whether or not transfers and hip fracture patients were excluded), and in the more severely injured blunt trauma subgroups. There were no differences between hospitals for the relatively small number of patients with penetrating trauma.

CONCLUSION

Differences between hospitals were apparent from the outset of the trauma system. However, designation as a trauma center does not appear to necessarily improve survival in large regional medical centers. Development of a trauma program and commitment to meeting national guidelines through the accreditation process does appear to be associated with improved outcome after injury.

Can the "golden hour of shock" safely be extended in blunt polytrauma patients? Prospective cohort study at a level I hospital in eastern Switzerland

BACKGROUND

The objective was to test, in this trauma system, the North American hypothesis that exceeding the 60-minute limit for the entire prehospital time ("golden hour of shock") increases mortality of blunt polytrauma patients.

METHODS

In a prospective, observational, cohort study conducted between 1990 and 1996, a severity characterization of trauma (ASCOT) score was used to compare the actual mortality with the predicted mortality in 107 blunt polytrauma patients (Group 1) with prehospital rescue periods < or = 60 minutes (time from accident until arrival at the emergency department). The same comparison was performed for 147 blunt polytrauma patients (Group 2) with rescue periods > 60 minutes. Inclusion criteria were blunt trauma of at least two body sites, an Injury Severity Score (ISS) of > or = 8, and direct admission to the trauma centre. Multivariate regression analysis was performed to test for bias and confounding, and to identify factors that might influence mortality. Odd ratio (OR) and 95% confidence interval (CI) were calculated.

RESULTS

The mortality in Group 1 was 14%, and was not statistically significantly higher than the 10.2% observed for Group 2. 4.8 patients, or 47% more than predicted, died in Group 1 (p = 0.057). The corresponding figures in Group 2 were 4.2 patients or 22% fewer than predicted (p = 0.19). Multivariate logistic regression confirmed this trend with a significant mortality odds ratio of 8 (95% CI 1.7 to 38.5) for Group 1 compared to Group 2. Significantly more patients in Group 2 were treated by emergency physicians.

CONCLUSIONS

It appears in this trauma system, in which emergency physicians often are deployed, that the 'golden hour of shock' can be extended safely in many blunt polytrauma patients, since this was associated with better survival figures than in those patients for whom the time was < 1 hour.

Interhospital transport: transport of critically ill patients

Primary emergency medicine systems in developed countries are well organized. Besides this primary system a secondary interhospital transport system has been developed in the past decade. The need for this system is expected to increase in the future following dramatic changes in the organization of the medical health system. This article outlines the current status of these secondary interhospital transfer systems, their components, possibilities, advantages or disadvantages, and the actual literature. Surprisingly, the available scientific data on these cost-intensive and highly developed systems are quite insufficient.

Burn center management of necrotizing soft-tissue surgical infections in unburned patients

BACKGROUND

Patients with necrotizing soft-tissue infections present great challenges in management from initial presentation through definitive care. Because burn centers concentrate expertise in critical care, wound management, and rehabilitation, we examined the effectiveness of burn center care for patients with necrotizing infections.

METHODS

We reviewed our burn center's experience with all patients admitted from 1990 through 1999 with a primary diagnosis of necrotizing fasciitis (NF) or Fournier's gangrene (FG).

RESULTS

Fifty-seven patients were identified, 18 with FG and 39 with NF. Patients had a high incidence of preexisting medical problems, including diabetes (37%), obesity defined as greater than 20% above ideal body weight (33%), and hypertension (33%). Seven of 57 (12%) patients died. Patients required a mean of 4.1 operative procedures (range 1 to 15) for definitive wound closure. The mean length of stay (survivors only) was 28.5 days, (range 3 to 70). Although costs increased throughout this period, a formal program of cost-containment resulted in no increase in actual charges per day, from a mean of $4,735 in 1991 to $5,202 in 1999.

CONCLUSIONS

Burn centers can provide successful and cost-effective acute care, definitive wound closure, and rehabilitation for patients with NF and FG.

Road traffic fatalities in Victoria, Australia and changes to the trauma care system

BACKGROUND

The aim was to identify organizational and clinical errors in the management of road traffic fatalities and to use this information to improve Victoria's trauma care system.

METHODS

A multidisciplinary committee evaluated the complete ambulance, hospital and autopsy records of 559 consecutive road traffic fatalities, who were alive on arrival of ambulance services, in five substantial time periods between 1992 and 1998. Patients who survived more than 30 days were excluded. Errors or inadequacies in each phase of management, including those contributing to death, were identified and an assessment was made of the potential preventability of death.

RESULTS

Findings between 1992 and 1998 were similar. In 1998, 1672 problems were identified in 110 deaths with 1024 (61 per cent) contributing to death. Eight hundred and forty-two (50 per cent) of the total problems occurred in the emergency department. There were frequent problems in initial patient reception and medical consultation, resuscitation, investigation and assessment (especially of the abdomen and head), and in transfer to the operating theatre or to a higher-level hospital. Victoria's combined preventable and potentially preventable death rate has been unchanged between 1992 and 1998 (34-38 per cent).

CONCLUSION

The problems identified led to a Ministerial Taskforce on Trauma and Emergency Services in Victoria as a consequence of which a new trauma system is now being implemented.

Trauma Attending in the Resuscitation Room: Does it Affect Outcome?

Although there are no Class I data supporting the regionalization of trauma care the consensus is that trauma centers decrease morbidity and mortality. However, the controversy continues over whether trauma surgeons should be in-house or take call from home. The current literature does not answer the question because in all of the recent studies the attendings who took call from home were in the resuscitation room guiding the care. We believe the correct question is: Does the presence of the trauma attending in the resuscitation room make a difference? At a university-affiliated Level II trauma center data from the trauma registry, resuscitation room flowsheet, and dictated admission notes were reviewed on all patients over a 6-month period. Data points were: attending present in the resuscitation room, standard demographics, resuscitation room time, time to operating room (OR), time to CT scan, length of stay, complications, and mortality. A total of 943 patients were studied with 216 (23%) having the attending present in the resuscitation room and 727 (77%) without the attending present. The groups were similar in terms of age, sex, Injury Severity Score, percentage Injury Severity Score greater than 15 (16–17.1%), and mechanism of injury (24–29% penetrating). Of all the data points studied only time to the OR had a statistically significance difference ( P < 0.05) with it taking 43.8 minutes (±20.1) when the attending was present and 109.4 minutes (±107) when the attending was absent. There were also no missed injuries, delays to the OR, or inappropriate workups when the attendings were present. Only the time to the OR reached statistical significance. The time to the OR is indicative of the decisionmaking process in the resuscitation room, and it is in this area that the attendings’ presence is the most useful. Also, we believe that it is important that there were no missed injuries, delays to the OR, or inappropriate workups when the attendings were present in the resuscitation room. This again speaks to the decision-making process. We believe that these data support the need for the attending to be present in the resuscitation room to facilitate accurate and timely decisions regardless of whether they take the call from home or in-house.

Perinatal regionalization and neonatal mortality in North Carolina, 1968-1994

OBJECTIVE

Our purpose was to analyze trends across time in the regionalization of low-birth-weight births and time trends for the association between regionalization and decreased neonatal mortality.

STUDY DESIGN

Data on 69,452 neonates with birth weights of 500 to 2000 g were obtained from electronic files of birth certificates. Hospitals' perinatal services were classified as level 1, 2, or 3 (level 3 refers to tertiary referral centers).

RESULTS

The likelihood of birth outside level 3 hospitals decreased from 1968 to 1994, with an average annual decrease of 24% for infants weighing 500 to 1500 g and 20% for infants weighing 1501 to 2000 g. After 1974, birth in a hospital with level 3 services was associated with a lower risk of dying. The strength of this association increased in the 1990s.

CONCLUSIONS

In North Carolina the proportion of infants weighing <2000 g born outside a hospital with level 3 neonatal services declined from 1974 through 1994. After 1974, birth in a hospital with level 3 neonatal services was associated with lower neonatal mortality.

Trauma systems

Trauma is one of the major causes of death and disability in modern society, particularly for the young. Organized trauma systems reduce mortality and morbidity from trauma. An effective trauma system addresses all aspects of trauma care, from prevention to rehabilitation. Well-developed trauma systems are currently available only to a minority of the world's population. Trauma systems in developed nations have much potential for improvement.

Trauma systems--state of the art

Trauma is an inevitable consequence of the lives we lead. There are many approaches to dealing with it but an ideal system, universally applicable, probably does not exist because of the national variations in social, economic, cultural and geographical characteristics. Many countries are beginning to recognise that the 'systems' they have in place for dealing with the burden of trauma are seriously deficient and that this situation cannot be allowed to continue into the new millennium. However, it is highly unlikely that in the near future. governments will suddenly find substantial extra finance for trauma care or the implementation of new systems. Throughout many countries, the individual components of trauma care systems are in place but, for whatever reasons, there is a lack of integration, which results in suboptimal care. The system we all should be aiming for is one of closer communication and greater cooperation. By taking into account community and national needs, available resources, and adapting what is currently in place it should then be possible to create 'a set of things working together as parts of a trauma mechanism'.

A case series analysis of mass casualty incidents

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.