[Prehospital chest tube placement: Which factors are associated with feeling confident to perform the procedure?] / Prähospitale Anlage von Thoraxdrainagen: Welche Faktoren sind mit einem subjektivem Sicherheitsgefühl assoziiert?

BACKGROUND: The prehospital placement of chest tubes is a rare but potentially life-saving procedure. A high level of subjective confidence with the procedure is essential for emergency medical doctors. This study aims to identify if there is a statistically significant difference in the subjective sense of confidence in prehospital chest tube placement regarding medical experience and qualification, clinical routine, and attendance at simulation courses. METHODS: Prehospital emergency physicians of three emergency medical services in Southwest Saxony, Greifswald, and Vechta, Germany, were invited to participate in an online survey from January to March 2022 using the online survey service limesurvey. The question "Do you feel confident in chest tube placement?" was used to measure the subjective level of confidence. Answers were compared with data concerning medical qualification, experience in prehospital emergency medicine, clinical routine, and attendance at simulation courses. Statistical analysis was performed using chi-squared test and Fisher's exact test. RESULTS: Three out of four participants felt confident in chest tube placement (53/71; 74.6%). More than half of the participants reported that they did not perform this procedure regularly (35/53, 66%). Subjective confidence was highest in physicians who regularly place chest tubes during their non-prehospital work (34/37; 91,9%; p<0.001), and more often when participants had clinical routine and attended simulation courses than when none of this applied (p=0.012). Attendance at simulation courses alone was not associated with a higher level of confidence (p=0.002). Specialists showed significantly more often subjective confidence in chest tube placement (p=0.0401). CONCLUSION: Prehospital chest tube placement is rare, but potentially lifesaving. An adequately high level of subjective confidence in the placement of chest tubes is a key condition for prehospital emergency doctors. Inhospital clinical routine and attendance at simulation courses are significantly associated with high levels of confidence. Our data indicate that working only in prehospital emergency settings without further clinical routine or medical specialization is not sufficient for achieving and ensuring subjective confidence in chest tube placement.

Top 5 barriers in cardiac arrest research as perceived by international early career researchers - A consensus study.

Aim of the study: Cardiac arrest research has not received as much scientific attention as research on other topics. Here, we aimed to identify cardiac arrest research barriers from the perspective of an international group of early career researchers. Methods: Attendees of the 2022 international masterclass on cardiac arrest registry research accompanied the Global Out-of-Hospital Cardiac Arrest Registry collaborative meeting in Utstein, Norway, and used an adapted hybrid nominal group technique to obtain a diverse and comprehensive perspective. Barriers were identified using a web-based questionnaire and discussed and ranked during an in-person follow-up meeting. After each response was discussed and clarified, barriers were categorized and ranked over two rounds. Each participant scored these from 1 (least significant) to 5 (most significant). Results: Nine participants generated 36 responses, forming seven overall categories of cardiac arrest research barriers. "Allocated research time" was ranked first in both rounds. "Scientific environment", including appropriate mentorship and support systems, ranked second in the final ranking. "Resources", including funding and infrastructure, ranked third. "Access to and availability of cardiac arrest research data" was the fourth-ranked barrier. This included data from the cardiac arrest registries, medical devices, and clinical studies. Finally, "uniqueness" was the fifth-ranked barrier. This included ethical issues, patient recruitment challenges, and unique characteristics of cardiac arrest. Conclusion: By identifying cardiac arrest research barriers and suggesting solutions, this study may act as a tool for stakeholders to focus on helping early career researchers overcome these barriers, thus paving the road for future research.

Cross-border simulation training for German and Polish emergency medical teams is feasible: conception and evaluation of a bilingual simulation training.

BACKGROUND: Cross-border cooperation of emergency medical services, institutions and hospitals helps to reduce negative impact of national borders and consecutive discrimination of persons living and working in border regions. This study aims to explore the feasibility and effectiveness of a cross-border bilingual simulation training for emergency medical services within an INTERREG-VA-funded project. METHODS: Five days of simulation training for German and Polish paramedics in mixed groups were planned. Effectiveness of training and main learning objectives were evaluated as pre-post-comparisons and self-assessment by participants. RESULTS: Due to COVID-19 pandemic, only three of nine training modules with n = 16 participants could be realised. Cross-border-simulation training was ranked more positively and was perceived as more useful after the training compared to pretraining. Primary survey has been performed using ABCDE scheme in 18 of 21 scenarios, whereas schemes to obtain medical history have been applied incompletely. However, participants stated to be able to communicate with patients and relatives in 10 of 21 scenarios. CONCLUSION: This study demonstrates feasibility of a bilingual cross-border simulation training for German and Polish rescue teams. Further research is highly needed to evaluate communication processes and intra-team interaction during bilingual simulation training and in cross-border emergency medical services rescue operations.

Prevalence and severity of pediatric emergencies in a German helicopter emergency service: implications for training and service configuration.

This study primarily aims to determine the frequency of life-threatening conditions among pediatric patients served by the DRF, a German helicopter emergency service (HEMS) provider. It also seeks to explore the necessity of invasive procedures in this population, discussing the implications for HEMS crew training and service configuration based on current literature. We analyzed the mission registry from 31 DRF helicopter bases in Germany, focusing on 7954 children aged 10 or younger over a 5-year period (2014-2018). Out of 7954 identified children (6.2% of all primary missions), 2081 (26.2%) had critical conditions. Endotracheal intubation was needed in 6.5% of cases, while alternative airway management methods were rare (n = 14). Half of the children required intravenous access, and 3.6% needed intraosseous access. Thoracostomy thoracentesis and sonography were only performed in isolated cases.  Conclusions: Critically ill or injured children are infrequent in German HEMS operations. Our findings suggest that the likelihood of HEMS teams encountering such cases is remarkably low. Besides endotracheal intubation, life-saving invasive procedures are seldom necessary. Consequently, we conclude that on-the-job training and mission experience alone are insufficient for acquiring and maintaining the competencies needed to care for critically ill or injured children. What is Known: • Pediatric emergencies are relatively rare in the prehospital setting, but their incidence is higher in helicopter emergency medical services (HEMS) compared to ground-based emergency services. What is New: • On average, HEMS doctors in Germany encounter a critically ill or injured child approximately every 1.5 years in their practice, establish an IV or IO access in infants or toddlers every 2 years, and intubate an infant every 46 years. • This low frequency highlights the insufficiency of on-the-job training alone to develop and maintain pediatric skills among HEMS crews. Specific interdisciplinary training for HEMS crews is needed to ensure effective care for critically unwell pediatric patients.

Bilingual resuscitation training does not affect adherence to resuscitation guidelines but reduces leadership skills and overall team performance. An observational study with cross-border German-Polish training.

Aim of study: This study aims to investigate feasibility and quality of a bilingual cardiopulmonary resuscitation training with interprofessional emergency teams from Germany and Poland. Methods: As part of a cross-border European Territorial Cooperation (Interreg-VA) funded project a combined communication and simulation training was organised. Teams of German and Polish emergency medicine personnel jointly practised resuscitation. The course was held in both languages with consecutive translation.Quality of chest compression was assessed using a simulator with feedback application. Learning objectives (quality of cardiopulmonary resuscitation, adherence to guidelines, closed loop communication), and team performance were assessed by an external observer. Coopers Team Emergency Assessment Measure questionnaire was used. Results: Twenty-one scenarios with 17 participants were analysed. In all scenarios, defibrillation and medication were delivered with correct dosage and at the right time. Mean fraction of correct hand position was 85.7% ± 25.7 [95%-CI 74.0; 97.4], mean fraction of compression depth 75.1% ± 21.0 [95%-CI 65.6; 84.7], compression rate 117.7 min-1 ± 7.1 [95%-CI 114.4; 120.9], and chest compression fraction 83.3% ± 3.8 [95%-CI 81.6; 85.0].Quality of cardiopulmonary resuscitation was rated as "fair" to "good", adherence to guidelines as "good", and closed loop communication as "fair". Bilingual teams demonstrated good situational awareness, but lack of leadership and suboptimal overall team performance. Conclusion: Bilingual and interprofessional cross-border resuscitation training in German and Polish tandem teams is feasible. It does not affect quality of technical skills such as high-quality chest compression but does affect performance of non-technical skills (e.g. closed loop communication and leadership).

Potential to enhance telephone cardiopulmonary resuscitation with improved instructions - findings from a simulation-based manikin study with lay rescuers.

BACKGROUND: Telephone-Cardiopulmonary Resuscitation (T-CPR) significantly increases rate of bystander resuscitation and improves patient outcomes after out-of-hospital cardiac arrest (OHCA). Nevertheless, securing correct execution of instructions remains a difficulty. ERC Guidelines 2021 recommend standardised instructions with continuous evaluation. Yet, there are no explicit recommendations on a standardised wording of T-CPR in the German language. We investigated, whether a modified wording regarding check for breathing in a German T-CPR protocol improved performance of T-CPR. METHODS: A simulation study with 48 OHCA scenarios was conducted. In a non-randomised trial study lay rescuers were instructed using the real-life-CPR protocol of the regional dispatch centre and as the intervention a modified T-CPR protocol, including specific check for breathing (head tilt-chin lift instructions). Resuscitation parameters were assessed with a manikin and video recordings. RESULTS: Check for breathing was performed by 64.3% (n = 14) of the lay rescuers with original wording and by 92.6% (n = 27) in the group with modified wording (p = 0.035). In the original wording group the head tilt-chin manoeuvre was executed by 0.0% of the lay rescuers compared to 70.3% in the group with modified wording (p < 0.001). The average duration of check for breathing was 1 ± 1 s in the original wording group and 4 ± 2 s in the group with modified wording (p < 0.001). Other instructions (e.g. check for consciousness and removal of clothing) were well performed and did not differ significantly between groups. Quality of chest compression did not differ significantly between groups, with the exception of mean chest compression depth, which was slightly deeper in the modified wording group. CONCLUSION: Correct check for breathing seems to be a problem for lay rescuers, which can be decreased by describing the assessment in more detail. Hence, T-CPR protocols should provide standardised explicit instructions on how to perform airway assessment. Each protocol should be evaluated for practicability.

Digital transition in rural emergency medicine: Impact of job satisfaction and workload on communication and technology acceptance.

BACKGROUND: Tele-emergency physicians (TEPs) take an increasingly important role in the need-oriented provision of emergency patient care. To improve emergency medicine in rural areas, we set up the project 'Rural|Rescue', which uses TEPs to restructure professional rescue services using information and communication technologies (ICTs) in order to reduce the therapy-free interval. Successful implementation of ICTs relies on user acceptance and knowledge sharing behavior. METHOD: We conducted a factorial design with active knowledge transfer and technology acceptance as a function of work satisfaction (high vs. low), workload (high vs. low) and point in time (prior to vs. after digitalization). Data were collected via machine readable questionnaires issued to 755 persons (411 pre, 344 post), of which 304 or 40.3% of these persons responded (194 pre, 115 post). RESULTS: Technology acceptance was higher after the implementation of TEP for nurses but not for other professions, and it was higher when the workload was high. Regarding active communication and knowledge sharing, employees with low work satisfaction are more likely to share their digital knowledge as compared to employees with high work satisfaction. This is an effect of previous knowledge concerning digitalization: After implementing the new technology, work satisfaction increased for the more experienced employees, but not for the less experienced ones. CONCLUSION: Our research illustrates that employees' workload has an impact on the intention of using digital applications. The higher the workload, the more people are willing to use TEPs. Regarding active knowledge sharing, we see that employees with low work satisfaction are more likely to share their digital knowledge compared to employees with high work satisfaction. This might be attributed to the Dunning-Kruger effect. Highly knowledgeable employees initially feel uncertain about the change, which translates into temporarily lower work satisfaction. They feel the urge to fill even small knowledge gaps, which in return leads to higher work satisfaction. Those responsible need to acknowledge that digital change affects their employees' workflow and work satisfaction. During such times, employees need time and support to gather information and knowledge in order to cope with digitally changed tasks.

[Safety aspects of prehospital thoracic emergency procedures: Results of a survey among German emergency physicians]. / Sicherheitsaspekte invasiver thorakaler Maßnahmen in der prähospitalen Notfallmedizin ­ Ergebnisse einer Umfrage unter deutschen Notärzt:innen.

BACKGROUND: The safe indication and performance of thoracic emergency procedures are crucial and potentially lifesaving in prehospital emergency care. This study aims to investigate issues of patient safety and quality assurance of prehospital invasive thoracic interventions. The survey does not represent the actual medical care situation but explores reasons for security concerns among emergency physicians. METHODS: Using a pre-validated questionnaire, prehospital emergency physicians of three prehospital rescue associations (Zweckverband) in Southwest Saxony, Greifswald, and Vechta, Germany, were queried via the online survey service limesurvey. The survey was conducted between January and March 2022. RESULTS: 104 emergency physicians participated (response rate 42.4%) 71 of which fully completed the survey (68%). 79% of the participants stated that they felt safe in performing pleural punction. Common reasons for postponing prehospital thoracic interventions included fear of complications or individual patient characteristics. 90% said that they were familiar with the on-board equipment options, and 60% reported that resources were sufficient to perform double-sided procedures. While in all three regions there is sufficient on-board equipment to perform procedures on two sides, one out of two participants said that lack of equipment deters them from performing prehospital invasive thoracic procedures. Emergency physicians who graduated from trauma courses and/or participate in air rescue are more likely to perform invasive thoracic procedures. More than half of the participants wanted more training in chest tube placement or pleural punction. CONCLUSION: Safety in prehospital invasive thoracic procedures needs improvement in structural, procedural, as well as human factors aspects. Safe handling of these rare but vital techniques requires more training. A lack of knowledge of equipment is a significant safety gap. Prehospital ultrasound constitutes a structural element of prehospital diagnostics.

[Is a tele-emergency physician system a sensible addition in rural German regions?-An analysis from a medical and economic perspective]. / Ist das Telenotarzt-System eine sinnvolle Ergänzung im ländlichen Raum? ­ Eine Analyse aus medizinischer und ökonomischer Perspektive.

BACKGROUND AND OBJECTIVES: In 2017, a tele-emergency-physician system was implemented in the county of Vorpommern-Greifswald (Germany) to optimise the prehospital emergency medical service and to counteract current challenges. It was evaluated from a medical and economic perspective whether a tele-emergency physician system is a useful addition to the existing prehospital emergency system, especially in rural regions. MATERIALS AND METHODS: Approximately 250,000 emergency medical service data from the years 2015 to 2020 (before and after the implementation of the telemedical system) were analysed in a pre-post comparison. A total of 3611 tele-emergency physician cases were analysed regarding medical indication and time-related factors. Additionally, total costs of the tele-emergency physician system as well as a cost analysis regarding prehospital and hospital medical costs of selected diseases were performed. RESULTS: The tele-emergency physician treated patients of all age groups with a wide spectrum of diseases. Of the cases, 48.2% were moderate to severe but not life-threatening disorders. Patients as well as emergency medical service personnel embraced the new system. According to the data, ambulances that were equipped with the telemedical system had the number of missions requiring an emergency physician on scene reduced significantly by 20%. The yearly costs of this telemedical system amount to €1.7 million. CONCLUSIONS: The tele-emergency physician system proved to be a telemedical innovation that is medically advisable, functional and cost-efficient. Therefore, the tele-emergency physician system continued to operate after the end of the research project and is ready to be implemented across Germany.

Dispatching citizens as first responders to out-of-hospital cardiac arrests: a systematic review and meta-analysis.

Mobile phone technologies to alert citizen first responders to out-of-hospital cardiac arrests (OHCAs) were implemented in numerous countries. This systematic review and meta-analysis aim to investigate whether activating citizen first responders increases bystanders' interventions and improves outcomes. We searched PubMed, EMBASE, and the Cochrane Central Register of Controlled Trials from inception to 24 November 2021, for studies comparing citizen first responders' activation versus standard emergency response in the case of OHCA. The primary outcome was survival at hospital discharge or 30 days. Secondary outcomes were discharge with favourable neurological outcome, bystander-initiated cardiopulmonary resuscitation (CPR), and the use of automated external defibrillators (AEDs) before ambulance arrival. Evidence certainty was evaluated with GRADE. Our search strategy yielded 1215 articles. After screening, we included 10 studies for a total of 23 351 patients. OHCAs for which citizen first responders were activated had higher rates of survival at hospital discharge or 30 days compared with standard emergency response [nine studies; 903/9978 (9.1%) vs. 1104/13 247 (8.3%); odds ratio (OR), 1.45; 95% confidence interval (CI), 1.21-1.74; P < 0.001], return of spontaneous circulation [nine studies; 2575/9169 (28%) vs. 3445/12 607 (27%); OR, 1.40; 95% CI, 1.07-1.81; P = 0.01], bystander-initiated CPR [eight studies; 5876/9074 (65%) vs. 6384/11 970 (53%); OR, 1.75; 95% CI, 1.43-2.15; P < 0.001], and AED use [eight studies; 654/9132 (7.2%) vs. 624/14 848 (4.2%); OR, 1.82; 95% CI, 1.31-2.53; P < 0.001], but similar rates of neurological intact discharge [three studies; 316/2685 (12%) vs. 276/2972 (9.3%); OR, 1.37; 95% CI, 0.81-2.33; P = 0.24]. Alerting citizen first responders to OHCA patients is associated with higher rates of bystander-initiated CPR, use of AED before ambulance arrival, and survival at hospital discharge or 30 days.

First responder systems can stay operational under pandemic conditions: results of a European survey during the COVID-19 pandemic.

BACKGROUND: Dispatching first responders (FR) to out-of-hospital cardiac arrest in addition to the emergency medical service has shown to increase survival. The promising development of FR systems over the past years has been challenged by the outbreak of COVID-19. Whilst increased numbers and worse outcomes of cardiac arrests during the pandemic suggest a need for expansion of FR schemes, appropriate risk management is required to protect first responders and patients from contracting COVID-19. This study investigated how European FR schemes were affected by the pandemic and what measures were taken to protect patients and responders from COVID-19. METHODS: To identify FR schemes in Europe we conducted a literature search and a web search. The schemes were contacted and invited to answer an online questionnaire during the second wave of the pandemic (December 2020/ January 2021) in Europe. RESULTS: We have identified 135 FR schemes in 28 countries and included responses from 47 FR schemes in 16 countries. 25 schemes reported deactivation due to COVID-19 at some point, whilst 22 schemes continued to operate throughout the pandemic. 39 schemes communicated a pandemic-specific algorithm to their first responders. Before the COVID-19 outbreak 20 FR systems did not provide any personal protective equipment (PPE). After the outbreak 19 schemes still did not provide any PPE. The majority of schemes experienced falling numbers of accepted call outs and decreasing registrations of new volunteers. Six schemes reported of FR having contracted COVID-19 on a mission. CONCLUSIONS: European FR schemes were considerably affected by the pandemic and exhibited a range of responses to protect patients and responders. Overall, FR schemes saw a decrease in activity, which was in stark contrast to the high demand caused by the increased incidence and mortality of OHCA during the pandemic. Given the important role FR play in the chain of survival, a balanced approach upholding the safety of patients and responders should be sought to keep FR schemes operational.

[Emergency medical service, medical on-call service, or emergency department : Germans unsure whom to contact in acute medical events]. / Rettungsdienst, kassenärztlicher Notdienst oder Notaufnahme : Es gelingt der Bevölkerung nur unzureichend, die richtige Ressource für medizinische Akutfälle zu wählen.

BACKGROUND: In medical events, patients have to independently decide whom to contact: emergency medical services, medical on-call service or emergency department. OBJECTIVES: Are Germans able to assess the urgency of medical events and choose the correct resource? MATERIALS AND METHODS: In 2018 a nationwide anonymous telephone survey was done in Gabler-Haeder design. In all, 708 interviewees were presented with six medical scenarios. Participants were asked to rate urgency and to assess whether medical help was necessary within minutes to hours. Telephone numbers of emergency medical services and medical on-call service were inquired. RESULTS: Urgency of different scenarios was often misjudged: in cases with high, medium, and low urgency the misjudgement rate were 20, 50, and 27%, respectively. If medical help was rated as necessary, some participants chose the wrong service: 25% would not call an ambulance in stroke or myocardial infarction. In cases with medium urgency, more respondents chose to consult an emergency department (38%) than to call medical on-call service (46%). CONCLUSIONS: Knowledge regarding different options for treatment of medical events and competence to assess urgency seem to be too low. Beside efforts to increase health literacy, one solution might be to introduce a joint telephone number for emergency medical services and medical on-call service with a uniform assessment tool and appropriate allocation.

[Technology-enhanced learning in anesthesiology and emergency medicine : A new approach to medical school teaching in the wake of the pandemic]. / "Technology-enhanced learning" in Anästhesiologie und Notfallmedizin : Ein neuer Weg in der studentischen Lehre im Schatten der Pandemie.

BACKGROUND: Coronavirus disease 2019 (COVID-19) has brought about unprecedented challenges to medical schools. Physical distancing as the most effective means of infection prevention renders traditional classroom teaching nearly impossible and new teaching methods are required to contain the infection risk whilst ensuring high-level education. OBJECTIVE: In order to minimize the need for classroom teaching we have created an interactive multimedia eLearning environment using the open-source learning management system "Moodle". This article describes the development of the eLearning environment and aims to establish the acceptance of technology-enhanced learning (TEL) among medical students and the evaluation of TEL as an alternative to classroom teaching. MATERIAL AND METHODS: We have built a multimedia eLearning environment for fourth year medical students covering the medical school curriculum "anesthesiology and emergency medicine", which is based on the recommendations of the German Society for Anesthesiology and Intensive Care Medicine (DGAI). We have chosen the open-source learning management system "Moodle" as a platform. "Moodle" is widely used by Anglo-American educational institutions to support and conduct academic and nonacademic teaching. In order to assess the students' experience, we have carried out an anonymized post-course survey consisting of multiple-choice and free-answer questions. RESULTS: Of the 157 participants 85.4% rated the course as "very good", 12.1% as "good" and 1.9% as "OK". Lower ratings were not given, 54.8% rated the course content as "very relevant", 43.3% as "relevant" and 1.9% as "neutral", 94.3% felt that more comparable online courses should be offered. The free-text answers revealed that accessibility and multimedia self-controlled learning were highly valued; however, it was felt that hands-on training cannot be replaced by eLearning. CONCLUSION: Technology Enhanced Learning was highly valued by our students and helped to reduce the need for classroom teaching; however, for teaching practical skills classroom teaching remains indispensable.

One out of three bystanders of out-of-hospital cardiac arrests shows signs of pathological psychological processing weeks after the incident - results from structured telephone interviews.

BACKGROUND: Witnessing an out-of-hospital cardiac arrest (OHCA) is a traumatic experience. This study analyses bystanders` psychological processing of OHCA. We examined the potential impact of bystanders performing resuscitation and the influence of the relationship between bystander and patient (stranger vs. family/friend of the patient) on the psychological processing. METHODS: A telephone interview survey with bystanders, who witnessed an OHCA of an adult patient was performed weeks after the event between December 2014 and April 2016. The semi-standardized questionnaire contained a question regarding the paramount emotion at the time of the interview. In a post-hoc analysis statements given in response were rated by independent researchers into the categories "signs of pathological psychological processing", "physiological psychological processing" and "no signs of psychological distress due to the OHCA". RESULTS: In this analysis 89 telephone interviews were included. In 27 cases (30.3%) signs of pathological psychological processing could be detected. Bystanders performing resuscitation had a higher rate of "no signs of psychological distress after witnessing OHCA" compared to those not resuscitating (54.7% vs. 26.7%, p < 0.05; relative risk 2.01; 95%CI 1.08, 3.89). No statistical significant differences in the psychological processing could be shown for gender, age, relationship to the patient, current employment in the health sector, location of cardiac arrest or number of additional bystanders. CONCLUSIONS: One out of three bystanders of OHCA suffers signs of pathological psychological processing. This was independent of bystander´s age, gender and relationship to the patient. Performing resuscitation seems to help coping with witnessing OHCA.

Smartphone apps to support laypersons in bystander CPR are of ambivalent benefit: a controlled trial using medical simulation.

BACKGROUND: Bystander-initiated resuscitation is essential for surviving out-of-hospital cardiac arrest. Smartphone apps can provide real-time guidance for medical laypersons in these situations. Are these apps a beneficial addition to traditional resuscitation training? METHODS: In this controlled trial, we assessed the impact of app use on the quality of resuscitation (hands-off time, assessment of the patient's condition, quality of chest compression, body and arm positioning). Pupils who have previously undergone a standardised resuscitation training, encountered a simulated cardiac arrest either (i) without an app (control group); (ii) with facultative app usage; or (iii) with mandatory app usage. Measurements were compared using generalised linear regression. RESULTS: 200 pupils attended this study with 74 pupils in control group, 65 in facultative group and 61 in mandatory group. Participants who had to use the app significantly delayed the check for breathing, call for help, and first compression, leading to longer total hands-off time. Hands-off time during chest compression did not differ significantly. The percentage of correct compression rate and correct compression depth was significantly higher when app use was mandatory. Assessment of the patient's condition, and body and arm positioning did not differ. CONCLUSIONS: Smartphone apps offering real-time guidance in resuscitation can improve the quality of chest compression but may also delay the start of resuscitation. Provided that the app gives easy-to-implement, guideline-compliant instructions and that the user is familiar with its operation, we recommend smartphone-guidance as an additional tool to hands-on CPR-training to increase the prevalence and quality of bystander-initiated CPR.

Telemedical emergency services: central or decentral coordination?

BACKGROUND AND OBJECTIVE: Teleemergency doctors support ambulance cars at the emergency site by means of telemedicine. Currently, each district has its own teleemergency doctor office (decentralized solution). This paper analyses the advantages and disadvantages of a centralized solution where several teleemergency doctors work in parallel in one office to support the ambulances in more districts. METHODS: The service of incoming calls from ambulances to the teleemergency doctor office can be modelled as a queuing system. Based on the data of the district of Vorpommern-Greifswald in the Northeast of Germany, we assume that arrivals and services are Markov chains. The model has parallel channels proportionate to the number of teleemergency doctors working simultaneously and the number of calls which one doctor can handle in parallel. We develop a cost function with variable, fixed and step-fixed costs. RESULTS: For the district of Greifswald, the likelihood that an incoming call has to be put on hold because the teleemergency doctor is already fully occupied is negligible. Centralization of several districts with a higher number of ambulances in one teleemergency doctor office will increase the likelihood of overburdening and require more doctors working simultaneously. The cost of the teleemergency doctor office per ambulance serviced strongly declines with the number of districts cooperating. DISCUSSION: The calculations indicate that centralization is feasible and cost-effective. Other advantages (e.g. improved quality, higher flexibility) and disadvantages (lack of knowledge of the location and infrastructure) of centralization are discussed. CONCLUSIONS: We recommend centralization of telemedical emergency services. However, the number of districts cooperating in one teleemergency doctor office should not be too high and the distance between the ambulance station and the telemedical station should not be too large.