The provision of medical care in environments with high levels of ambient noise (HLAN), such as concerts or sporting events, presents unique communication challenges. Audio transmissions can be incomprehensible to the receivers. Text-based communications may be a valuable primary and/or secondary means of communication in this type of setting.

To evaluate the usability of text-based communications in parallel with standard two-way radio communications during mass-gathering (MG) events in the context of HLAN.

This Canadian study used outcome survey methods to evaluate the performance of communication devices during MG events. Ten standard commercially available handheld smart phones loaded with basic voice and data plans were assigned to health care providers (HCPs) for use as an adjunct to the medical team's typical radio-based communication. Common text messaging and chat platforms were trialed. Both efficacy and provider satisfaction were evaluated.

During a 23-month period, the smart phones were deployed at 17 events with HLAN for a total of 40 event days or approximately 460 hours of active use. Survey responses from health care providers (177) and dispatchers (26) were analyzed. The response rate was unknown due to the method of recruitment. Of the 155 HCP responses to the question measuring difficulty of communication in environments with HLAN, 68.4% agreed that they “occasionally” or “frequently” found it difficult to clearly understand voice communications via two-way radio. Similarly, of the 23 dispatcher responses to the same item, 65.2% of the responses indicated that “occasionally” or “frequently” HLAN negatively affected the ability to communicate clearly with team members. Of the 168 HCP responses to the item assessing whether text-based communication improved the ability to understand and respond to calls when compared to radio alone, 86.3% “agreed” or “strongly agreed” that this was the case. The dispatcher responses (n = 21) to the same item also “agreed” or “strongly agreed” that this was the case 95.5% of the time.

The use of smart phone technology for text-based communications is a practical and feasible tool for MG events and should be explored further. Multiple, reliable, discrete forms of communication technology are pivotal to executing effective on-site medical and disaster responses.

LundA, WongD, LewisK, TurrisSA, VaislerS, GutmanS. Text Messaging as a Strategy to Address the Limits of Audio-Based Communication During Mass-Gathering Events with High Ambient Noise. Prehosp Disaster Med.2013;28(1):1-7.

Community disaster preparedness plans, particularly those with content that would mitigate the effects of psychological trauma on vulnerable rural populations, are often nonexistent or underdeveloped. The purpose of the study was to develop and evaluate a model of disaster mental health preparedness planning involving a partnership among three, key stakeholders in the public health system.

A one-group, post-test, quasi-experimental design was used to assess outcomes as a function of an intervention designated Guided Preparedness Planning (GPP). The setting was the eastern-, northern-, and mid-shore region of the state of Maryland. Partner participants were four local health departments (LHDs), 100 faith-based organizations (FBOs), and one academic health center (AHC)—the latter, collaborating entities of the Johns Hopkins University and the Johns Hopkins Health System. Individual participants were 178 community residents recruited from counties of the above-referenced geographic area. Effectiveness of GPP was based on post-intervention assessments of trainee knowledge, skills, and attitudes supportive of community disaster mental health planning. Inferences about the practicability (feasibility) of the model were drawn from pre-defined criteria for partner readiness, willingness, and ability to participate in the project. Additional aims of the study were to determine if LHD leaders would be willing and able to generate post-project strategies to perpetuate project-initiated government/faith planning alliances (sustainability), and to develop portable methods and materials to enhance model application and impact in other health jurisdictions (scalability).

The majority (95%) of the 178 lay citizens receiving the GPP intervention and submitting complete evaluations reported that planning-supportive objectives had been achieved. Moreover, all criteria for inferring model feasibility, sustainability, and scalability were met.

Within the span of a six-month period, LHDs, FBOs, and AHCs can work effectively to plan, implement, and evaluate what appears to be an effective, practical, and durable model of capacity building for public mental health emergency planning.

McCabeOL, PerryC, AzurM, TaylorHG, GwonH, MosleyA, SemonN, LinksJM. Guided Preparedness Planning with Lay Communities: Enhancing Capacity of Rural Emergency Response Through a Systems-Based Partnership. Prehosp Disaster Med. 2012;28(1):1-8.

A modified Medical Resource Model to predict the medical resources required at mass gatherings based on the risk profile of events has been developed. This study was undertaken to validate this tool using data from events held in both a developed and a developing country.

A retrospective study was conducted utilizing prospectively gathered data from individual events at Old Trafford Stadium in Manchester, United Kingdom, and Ellis Park Stadium, Johannesburg, South Africa. Both stadia are similar in design and spectator capacity. Data for Professional Football as well as Rugby League and Rugby Union (respectively) matches were used for the study. The medical resources predicted for the events were determined by entering the risk profile of each of the events into the Medical Resource Model. A recently developed South African tool was used to predetermine medical staffing for mass gatherings. For the study, the medical resources actually required to deal with the patient load for events within the control sample from the two stadia were compared with the number of needed resources predicted by the Medical Resource Model when that tool was applied retrospectively to the study events. The comparison was used to determine if the newly developed tool was either over- or under-predicting the resource requirements.

In the case of Ellis Park, the model under-predicted the basic life support (BLS) requirement for 1.5% of the events in the data set. Mean over-prediction was 209.1 minutes for BLS availability. Old Trafford displayed no events for which the Medical Resource Model would have under-predicted. The mean over-prediction of BLS availability for Old Trafford was 671.6 minutes. The intermediate life support (ILS) requirement for Ellis Park was under-predicted for seven of the total 66 events (10.6% of the events), all of which had one factor in common, that being relatively low spectator attendance numbers. Modelling for ILS at Old Trafford did not under-predict for any events. The ILS requirements showed a mean over-prediction of 161.4 minutes ILS availability for Ellis Park compared with 425.2 minutes for Old Trafford. Of the events held at Ellis Park, the Medical Resource Model under-predicted the ambulance requirement in 4.5% of the events. For Old Trafford events, the under-prediction was higher: 7.5% of cases.

The medical resources that are deployed at a mass gathering should best match the requirement for patient care at a particular event. An important consideration for any model is that it does not continually under-predict the resources required in relation to the actual requirement. With the exception of a specific subset of events at Ellis Park, the rate of under-prediction for this model was acceptable.

SmithWP, TuffinH, StrattonSJ, WallisLA. Validation of a Modified Medical Resource Model for Mass Gatherings. Prehosp Disaster Med.2013;28(1):1-7.

To design and test a model to predict surge capacity bottlenecks at a large academic medical center in response to a mass-casualty incident (MCI) involving multiple burn victims.

Using the simulation software ProModel, a model of patient flow and anticipated resource use, according to principles of disaster management, was developed based upon historical data from the University Hospital of the University of Michigan Health System. Model inputs included: (a) age and weight distribution for casualties, and distribution of size and depth of burns; (b) rate of arrival of casualties to the hospital, and triage to ward or critical care settings; (c) eligibility for early discharge of non-MCI inpatients at time of MCI; (d) baseline occupancy of intensive care unit (ICU), surgical step-down, and ward; (e) staff availability—number of physicians, nurses, and respiratory therapists, and the expected ratio of each group to patients; (f) floor and operating room resources—anticipating the need for mechanical ventilators, burn care and surgical resources, blood products, and intravenous fluids; (g) average hospital length of stay and mortality rate for patients with inhalation injury and different size burns; and (h) average number of times that different size burns undergo surgery. Key model outputs include time to bottleneck for each limiting resource and average waiting time to hospital bed availability.

Given base-case model assumptions (including 100 mass casualties with an inter-arrival rate to the hospital of one patient every three minutes), hospital utilization is constrained within the first 120 minutes to 21 casualties, due to the limited number of beds. The first bottleneck is attributable to exhausting critical care beds, followed by floor beds. Given this limitation in number of patients, the temporal order of the ensuing bottlenecks is as follows: Lactated Ringer's solution (4 h), silver sulfadiazine/Silvadene (6 h), albumin (48 h), thrombin topical (72 h), type AB packed red blood cells (76 h), silver dressing/Acticoat (100 h), bismuth tribromophenate/Xeroform (102 h), and gauze bandage rolls/Kerlix (168 h). The following items do not precipitate a bottleneck: ventilators, topical epinephrine, staplers, foams, antimicrobial non-adherent dressing/Telfa types A, B, or O blood. Nurse, respiratory therapist, and physician staffing does not induce bottlenecks.

This model, and similar models for non-burn-related MCIs, can serve as a real-time estimation and management tool for hospital capacity in the setting of MCIs, and can inform supply decision support for disaster management.

AbirM, DavisMM, SankarP, WongAC, WangSC. Design of a Model to Predict Surge Capacity Bottlenecks for Burn Mass Casualties at a Large Academic Medical Center. Prehosp Disaster Med. 2013;28(1):1-10.

Emergency pediatric life support (EPLS) of children infected with transmissible respiratory diseases requires adequate respiratory protection for medical first responders. Conventional air-purifying respirators (APR) and modern loose-fitting powered air-purifying respirator-hoods (PAPR-hood) may have a different impact during pediatric resuscitation and therefore require evaluation.

This study investigated the influence of APRs and PAPR-hoods during simulated pediatric cardiopulmonary resuscitation.

Study design was a randomized, controlled, crossover study. Sixteen paramedics carried out a standardized EPLS scenario inside an ambulance, either unprotected (control) or wearing a conventional APR or a PAPR-hood. Treatment times and wearer comfort were determined and compared.

All paramedics completed the treatment objectives of the study arms without adverse events. Study subjects reported that communication, dexterity and mobility were significantly better in the APR group, whereas the heat-build-up was significantly less in the PAPR-hood group. Treatment times compared to the control group did not significantly differ for the APR group but did with the PAPR-hood group (261±12 seconds for the controls, 275±9 seconds for the conventional APR and 286±13 seconds for the PAPR-hood group, P < .05.

APRs showed a trend to better treatment times compared to PAPR-hoods during simulated pediatric cardiopulmonary resuscitation. Study participants rated mobility, ease of communication and dexterity with the tight-fitting APR system significantly better compared to the loose-fitting PAPR-hood.

SchumacherJ, GraySA, MichelS, AlcockR, BrinkerA. Respiratory Protection During Simulated Emergency Pediatric Life Support: A Randomized, Controlled, Crossover Study. Prehosp Disaster Med. 2013;28(1):1-6.

Timely access to acute medical treatment can be critical for patients suffering from severe stroke. Little information is available about the impact of prehospital delays on the clinical conditions of stroke patients, but it is possible that prehospital delays lead to neurological deterioration. The aim of this study was to examine the impact of prehospital delays related to emergency medical services on the level of consciousness at admission in patients with severe stroke.

This retrospective study assessed 712 consecutive patients diagnosed with cerebrovascular diseases who were admitted to an intensive care unit in Tokyo, Japan, from April 1998 through March 2008. Data, including the time from the call to the ambulance service to the arrival of the ambulance at the patient location (on-scene), and the time from the arrival of the ambulance on-scene to its arrival at the emergency center were obtained. The following demographic and clinical information also were obtained from medical records: sex, age, and Glasgow Coma Scale (GCS) score at admission.

The mean time from ambulance call to arrival on-scene was 7 (SD=3) minutes, and the mean time from ambulance call to arrival at the center was 37 (SD=8) minutes. A logistic regression model for predicting GCS scores of 3 and 4 at admission was produced. After adjusting for sex, age, and time from arrival on-scene to arrival at the center, a longer call-to-on-scene time was significantly associated with poor GCS scores (OR = 1.056/min; 95% confidence interval, [CI] = 1.008-1.107). After adjusting for sex and age, a longer call-to-arrival at the center time also was significantly associated with poor GCS scores (OR = 1.020; 95% CI = 1.002-1.038).

Prehospital delays were significantly associated with decreased levels of consciousness at admission in patients suffering from a stroke. As level of consciousness is the strongest predictor of outcome, reducing prehospital delays may be necessary to improve the outcomes in patients with severe stroke.

OhwakiK, WatanabeT, ShinoharaT, NakagomiT, YanoE. Relationship Between Time from Ambulance Call to Arrival at Emergency Center and Level of Consciousness at Admission in Severe Stroke Patients. Prehosp Disaster Med. 2012;28(1):1-4.

In December 2007, civil disruption and violence erupted in Kenya following national elections, displacing 350,000 people and affecting supply chains and services. The Kenyan government and partners were interested in assessing the extent of disruption in essential health services, especially HIV treatment.

A two-stage cluster sampling for patients taking antiretroviral therapy (ART) was implemented ten weeks after elections, March 10-21, 2008, at twelve health facilities providing ART randomly selected in each of the three provinces most affected by post-election disruption—Rift Valley, Nyanza, and Central Provinces. Convenience samples of patients with tuberculosis, hypertension, or diabetes were also interviewed from the same facilities. Finally, a convenience sampling of internally displaced persons (IDPs) in the three provinces was conducted.

Three hundred thirty-six IDPs in nine camps and 1,294 patients in 35 health facilities were interviewed. Overall, nine percent of patients reported having not returned to their routine health care facility; 9%-25% (overall 16%) reported a temporary inability for themselves or their children to access care at some point during January-February 2008. Less than 15% of patients on long-term therapies for HIV, tuberculosis, diabetes, or hypertension had treatment interruptions compared with 2007. The proportion of tuberculosis patients receiving a ≥45-day supply of medication increased from five percent in November 2007 to 69% in December 2007. HIV testing decreased in January 2008 compared with November 2007 among women in labor wards and among persons tested through voluntary counseling and testing services in Nyanza and Rift Valley Provinces. Patients and their family members witnessed violence, especially in Nyanza and Rift Valley Provinces (54%-59%), but few patients (2.5%-14%, 10% overall) personally experienced violence. More IDPs reported witnessing (80%) or personally experiencing (38%) violence than did patients. About half of patients and three-quarters of IDPs interviewed had anxiety or depression symptoms during the four weeks before the assessment. There was no association among patients between the presence of HIV, tuberculosis, diabetes, and hypertension and the prevalence of anxiety or depression symptoms.

More than 85% of patients in highly affected provinces avoided treatment interruptions; this may be in part related to practitioners anticipating potential disruption and providing patients with medications for an extended period. During periods of similar crisis, anticipating potential limitations on medication access and increased mental health needs could potentially prevent negative health impacts.

BamrahS, MbithiA, MerminJH, BooT, BunnellRE, SharifSK, CooksonST. The Impact of Post-Election Violence on HIV and Other Clinical Services and on Mental Health—Kenya, 2008. Prehosp Disaster Med. 2013;28(1):1-9.

Heart failure poses a significant burden of disease, resulting in 2,658 Australian deaths in 2008, and listed as an associated cause of death in a further 14,466 cases. Common in the hospital setting, continuous positive airway pressure (CPAP) therapy is a non-invasive ventilation technique used to prevent airway collapse and manage acute pulmonary edema (APO). In the hospital setting, CPAP has been known to decrease the need for endotracheal intubation in patients with APO. Therefore the objective of this literature review was to identify the effectiveness of CPAP therapy in the prehospital environment.

A review of selected electronic medical databases (Cochrane, Medline, EMBASE, and CINAHL) was conducted from their commencement date through the end of May 2012. Inclusion criterion was any study type reporting the use of CPAP therapy in the prehospital environment, specifically in the treatment of heart failure and acute pulmonary edema. References of relevant articles were also reviewed.

The literature search located 1,253 articles, 12 of which met the inclusion criteria. The majority of studies found that the use of CPAP therapy in the prehospital environment is associated with reduced short-term mortality as well as reduced rates of endotracheal intubation. Continuous positive airway pressure therapy was also shown to improve patient vital signs during prehospital transport and reduce myocardial damage.

The studies conducted of prehospital use of CPAP to manage APO have all demonstrated improvement in patient outcomes in the short term.

Available evidence suggests that the use of CPAP therapy in the prehospital environment may be beneficial to patients with acute pulmonary edema as it can potentially decrease the need for endotracheal intubation, improve vital signs during transport to hospital, and improve short-term mortality.

WilliamsB, BoyleM, RobertsonN, GiddingsC. When Pressure is Positive: A Literature Review of the Prehospital Use of Continuous Positive Airway Pressure. Prehosp Disaster Med.2013;28(1):1-10.

Military health care providers (HCPs) have an integral role during disaster, humanitarian, and civic assistance (DHCA) missions. Since 50% of patients seen in these settings are children, military providers must be prepared to deliver this care.

The purpose of this systematic, integrative review of the literature was to describe the knowledge and clinical skills military health care providers need in order to provide care for pediatric outpatients during DHCA operations.

A systematic search protocol was developed in conjunction with a research librarian. Searches of PubMed and CINAHL were conducted using terms such as Disaster*, Geological Processes, and Military Personnel. Thirty-one articles were included from database and manual searches.

Infectious diseases, vaccines, malnutrition, sanitation and wound care were among the most frequently mentioned of the 49 themes emerging from the literature. Concepts included endemic, environmental, vector-borne and vaccine-preventable diseases; enhanced pediatric primary care; and skills and knowledge specific to disaster, humanitarian and civic assistance operations.

The information provided is a critical step in developing curriculum specific to caring for children in DHCA. While the focus was military HCPs, the knowledge is easily translated to civilian HCPs who provide care to children in these situations.

JohnsonHL, GaskinsSW, SeibertDC. Clinical Skill and Knowledge Requirements of Health Care Providers Caring for Children in Disaster, Humanitarian and Civic Assistance Operations: An Integrative Review of the Literature. Prehosp Disaster Med.2013;28(1):1-8.

Predicting injury patterns of patients based only on mechanism of injury is difficult and is well described in the literature. Characteristics of patients on-scene immediately following injury(ies) may lead to predicting injury patterns. Although reported frequently, the significance of victim ambulation after a motor vehicle crash is poorly understood. It was hypothesized that ambulation at the scene is not predictive of injury severity following a motor vehicle crash (MVC).

A prospective, cohort study of 117 consecutive injured patients who were ambulatory after MVCs were enrolled. Paramedics in a large urban Emergency Medical Services (EMS) system were mandated to document “ambulatory” or “nonambulatory” for motor vehicle collisions in order to complete their prehospital electronic medical records. This assured accuracy and completeness in the data collection. All charts were abstracted for trauma-induced injury and imaging results.

A total of 608 (10.9%) persons were ambulatory at the scene, of which 284 had an injury pattern documented in the prehospital or emergency department record. The average age was 35.9 (SD = 16.8) years, and 158 (55.6%) were male. A total of 707 injuries were identified in the 284 patients who had sustained injuries.

Ambulation after motor vehicle collisions appears to be only infrequently associated with major injuries, although this population still may present with significant injuries. A larger, prospective study is warranted.

MerlinMA, CiccosantiC, SayboltMD, BockoffO, MazzeiM, ShiroffA. A Prospective Observational Analysis of Ambulation After Motor Vehicle Collisions. Prehosp Disaster Med. 2013;28(1):1-3.