[Time in care of trauma patients in the air rescue service: implications for disposition?]

[Prehospital treatment of polytrauma : Ongoing challenge in prehospital emergency services]

Tscherne was the first to define the term polytrauma in 1966 as "multiple injuries to different regions of the body sustained simultaneously, with at least one injury or the combination of these injuries being life-threatening". This definition highlights the essential pathophysiological paradigm of polytrauma, with the life-threating characteristics resulting from injuries to multiple organ systems. The treatment of polytrauma patients begins at the scene of the accident. Important life-saving initial interventions can already be carried out on site through targeted measures and expertise of the emergency medical service team, thus improving patient survival. The advanced trauma life support/prehospital trauma life support (ATLS/PHTLS) concept is the worldwide gold standard. As prehospital treatment of severely injured patients is not routine for most emergency teams, concepts and emergency interventions must be regularly trained. This is the prerequisite for safe and effective emergency treatment in this time-critical situation.

Airway Management in the Emergency Department (The OcEAN-Study) - a prospective single centre observational cohort study

BACKGROUND

Emergency airway management (AM) is a major key for successful resuscitation of critically ill non-traumatic (CINT) patients. Details of the AM of these patients in German emergency departments (ED) are unknown. This observational study describes epidemiology, airway techniques, success rates and complications of AM in CINT ED patients in the resuscitation room (RR).

METHODS

Data was collected prospectively on adult CINT patients admitted to the RR of a single German university ED September 2014 to August 2015. Patient characteristics, out-of-hospital and in-hospital RR AM, complications and success rates were recorded using a self-developed airway registry form.

RESULTS

During the study period 34,303 patients were admitted to the ED, out of those 21,074 patients for non-trauma emergencies. Suffering from severe acute life-threatening problems, 532 CINT patients were admitted to the RR. 150 (28.2%) CINT patients had received out-of-hospital AM. In 16 of these cases (10.7%) the inserted airway needed to be changed after RR admission (unrecognized oesophageal intubation: n = 2, laryngeal tube exchange: n = 14). 136 (25.6%) CINT patients without out-of-hospital AM received RR AM immediately after admission. The first-pass and overall success rate in the RR were 71 and 100%, respectively, and multiple intubation attempts were necessary in 29%. A lower Cormack/Lehane (C/L) grade was associated with less intubation attempts (C/L1/2 vs. 3/4: 1.2 ± 0.5 vs. 1.8 ± 1.2, p = 0.0002). Complication rate was 43%.

CONCLUSIONS

OcEAN demonstrates the challenges of AM in CINT patients in a German ED RR. We propose a nation-wide ED airway registry to better track outcomes in the future.

Current Status of helicopter emergency medical services in China: A bibliometric analysis

BACKGROUND

After nearly 20 years of development, China has realized some achievements in helicopter emergency medical services (HEMS). The purpose of this article is to introduce and evaluate the development and characteristics of HEMS in China by collecting and analyzing relevant literature and, in so doing, help this vital service to further develop.

METHOD

We conducted a Pubmed, Medline, Embase, ScienceDirect, Wanfang, CNKI, and VIP search of the literature on HEMS of China published between January 1950 and April 2017. The title, author name, number of authors, publishing date, country or region of origin, institution, type of article, study topic, funding source, and level of evidence of each article were recorded and analyzed.

RESULTS

There were 41 papers included in the analysis. All articles were published in Chinese. The selected articles were published between 2002 and 2017. The 41 articles originated from China, but 7 different regions were represented: East China (n = 14), followed by North China (n = 12), Central China (n = 8), Southwest China (n = 3), South China (n = 2), and Northwest China (n = 2). The articles included 18 clinical studies, 12 reviews, and 11 clinical guidelines. Among these, 22 articles were from public hospitals; 18 were from military units and 1 came from a private hospital. One article from the public hospitals was funded by public foundations (4.5%); 11 articles from the army units received support from Army funding (61.1%). Compared with the public and private hospitals, articles from military units were more likely to receive financial support (χ = 15.7 P <.01). All the articles were assigned a level of evidence from 1 to 5. Level 5 (78.0%) was the most frequent level of evidence. There were 7 studies at level 4. Only 2 articles were assigned to level 3. There were no articles at levels 1 or 2.

CONCLUSIONS

China's HEMS is a relatively new service. Its level of development is low, interregional development is uneven, and cooperation has been insufficient. We need to strengthen capital investment and develop a unified guideline to further enhance the development of HEMS in China.

[Civilian blast injuries: an underestimated problem? : Results of a retrospective analysis of the TraumaRegister DGU®]

BACKGROUND

Blast injuries are a rare cause of potentially life-threatening injuries in Germany. During the past 30 years such injuries were seldom the cause of mass casualties, therefore, knowledge and skills in dealing with this type of injury are not very extensive.

MATERIAL AND METHODS

A retrospective identification of all patients in the TraumaRegister DGU® of the German Trauma Society (TR-DGU) who sustained blast injuries between January 1993 and November 2012 was carried out. The study involved a descriptive characterization of the collective as well as three additional collectives. The arithmetic mean, standard deviation and 95 % confidence interval of the arithmetic mean for different demographic parameters and figures for prehospital and in-hospital settings were calculated. A computation of prognostic scores, such as the Revised Injury Severity Classification (RISC) and the updated version RISC II (TR-DGU-Project-ID 2012-035) was performed.

RESULTS

A total of 137 patients with blast injuries could be identified in the dataset of the TR-DGU. Of the patients 90 % were male and 43 % were transported by the helicopter emergency service (HEMS) to the various trauma centres. The severely injured collective with a mean injury severity scale (ISS) of 18.0 (ISS ≥ 16 = 52 %) had stable vital signs. In none of the cases was it necessary to perform on-site emergency surgery but a very high proportion of patients (59 %) had to be surgically treated before admittance to the intensive care unit (ICU). Of the patients 27 % had severe soft tissue injuries with an Abbreviated Injury Scale (AIS) ≥ 3 and 90 % of these injuries were burns. The 24 h in-hospital fatality was very low (3 %) but the stay in the ICU tended to be longer than for other types of injury (mean 5.5 ventilation days and 10.7 days in the intensive care unit). Organ failure occurred in 36 % of the cases, multiorgan failure in 29 % and septic events in 14 %. Of the patients 16 % were transferred to another hospital during the first 48 h. The RISC and the updated RISC II tended to underestimate the severity of injuries and mortality (10.2 % vs. 6.8 % and 10.7 % vs. 7.5 %, respectively) and the trauma associated severe hemorrhage (TASH) score underestimated the probability for transfusion of more than 10 units of packed red blood cells (5.0 % vs. 12.5 %).

CONCLUSION

This article generates several hypotheses, which should be confirmed with additional investigations. Until then it has to be concluded that patients who suffer from accidental blast injuries in the civilian setting (excluding military operations and terrorist attacks) show a combination of classical severe trauma with blunt and penetrating injuries and additionally a high proportion of severe burns (combined thermomechanical injury). They stay longer in the ICU than other trauma patients and suffer more complications, such as sepsis and multiorgan failure. Established scores, such as RISC, RISC II and TASH tend to underestimate the severity of the underlying trauma.

[Air rescue missions at night: Data analysis of primary and secondary missions by the DRF air rescue service in 2014]

The advantages that are inherent to the air ambulance service are shown in a reduction in mortality of critically ill or injured patients. The air ambulance service ensures quick and efficient medical care to a patient as well as the immediate transport of patients to a suitable hospital. In addition, primary air rescue has proved to be effective as a support for the standard ground-based ambulance services in some regions of Germany during the night. Under certain conditions, such as the strict adherence to established, practiced and coordinated procedures, air rescue at night does not have a significantly higher risk compared to operations in daytime. Particular requirements should be imposed for air rescue operations at night: a strict indication system for alerting, 4-man helicopter crews solely during the night as well as pilots (and copilots) with the correct qualifications and experience in dealing with night vision devices on a regular basis. Moreover, the helicopters need to be suitable and approved for night flying including cabin upgrades and the appropriate medical technology equipment. To increase the benefits of air rescue for specific diseases and injuries, a nationwide review of the processes is needed to further develop the primary air rescue service.

HEMS in Alpine Rescue for Pediatric Emergencies

OBJECTIVE

The objective of this study was to describe the pediatric emergencies encountered by the Christophorus-1 helicopter emergency medical service (HEMS) during a period of 2 years.

METHODS

Emergency treatment of pediatric casualties by HEMS was evaluated at a helicopter base. Children up to 14 years who were treated by HEMS emergency physicians from Christophorus-1 during primary missions in the alpine region were retrospectively enrolled.

RESULTS

Of the 1314 HEMS operations conducted during a 2-year investigation period, pediatric emergencies accounted for 114 (8.7%). Trauma was the most common emergency indication (91.3%) in alpine areas, and 77.5% of the indications were related to skiing and snowboarding; 11.3% of the prehospital pediatric emergencies were classified as life-threatening. Interventions on site were rendered in 46.3% of cases. Mean and SD intervals for approach were 11.0 ± 3.0 minutes; for treatment, 14.0 ± 6.0 minutes; and for transport, 8.0 ± 4.0 minutes. Intervals on site were significantly longer whenever it was necessary to search for an interim landing place (P < .001) or perform rope extrication (P < .001). Aggravating environmental conditions such as low temperature (78.8%), rocky terrain (18.8%), or precipitation (12.5%) were common.

CONCLUSIONS

Rapid procedures are preferred to sustained on-scene treatment, particularly when surrounding conditions are hostile. HEMS emergency physicians attempt to keep on-site intervals short and treatment and monitoring to the essential to minimize delay in rescue.

Preferential effects of low volume versus high volume replacement with crystalloid fluid in a hemorrhagic shock model in pigs

Background

Fluid resuscitation is a core stone of hemorrhagic shock therapy, and crystalloid fluids seem to be associated with lower mortality compared to colloids. However, as redistribution starts within minutes, it has been suggested to replace blood loss with a minimum of a three-fold amount of crystalloids. The hypothesis was that in comparison to high volume (HV), a lower crystalloid volume (LV) achieves a favorable coagulation profile and exerts sufficient haemodynamics in the acute phase of resuscitation.

Methods

In 24 anaesthetized pigs, controlled arterial blood loss of 50 % of the estimated blood volume was either (n = 12) replaced with a LV (one-fold) or a HV (three-fold) volume of a balanced, acetated crystalloid solution at room temperature. Hemodynamic parameters, dilution effects and coagulation profile by standard coagulation tests and thromboelastometry at baseline and after resuscitation were determined in both groups.

Results

LV resuscitation increased MAP significantly less compared to the HV, 61 ± 7 vs. 82 ± 14 mmHg (p < 0.001) respectively, with no difference between lactate and base excess between groups. Haematocrit after fluid replacement was 0.20 vs. 0.16 (LV vs. HV, p < 0.001), suggesting a grade of blood dilution of 32 vs. 42 % (p < 0.001) compared to baseline values. Compared to LV, HV resulted in decreased core temperature (37.5 ± 0.2 vs. 36.0 ± 0.6 °C, p < 0.001), lower platelet count (318 ± 77 vs. 231 ± 53 K/μL, p < 0.01) and lower plasma fibrinogen levels (205 ± 19 vs. 168 ± 24 mg/dL, p < 0.001). Thromboelastometric measurements showed a significant impairment on viscoelastic clot properties following HV group. While prothrombin time index decreased significantly more in the HV group, activated partial thromboplastin time did not differ between both groups. HV did not result in hyperchloraemic acidosis.

Discussion

Coagulation parameters represented by plasma fibrinogen and ROTEM parameters were also less impaired with LV. With regrad to hematocrit, 60 % of LV remained intracascular , while in HV only 30 % remained in circulation within the first hour of administration. In the acute setting of 50 % controlled blood loss, a one fold LV crystalloid replacement strategy is sufficient to adequately raise blood pressure up to a mean arterial pressure >50 mm Hg. The concept of damage control resuscitation (DCR) with permissive hypotension may be better met by using LV as compared to a three fold HV resuscitation strategy.

Conclusion

High volume administration of an acetated balanced crystalloid does not lead to hyperchloraemic acidosis, but may negatively influence clinical parameters, such as higher blood pressure, lower body temperature and impaired coagulation parameters, which could potentially increase bleeding after trauma. Replacement of acute blood loss with just an equal amount of an acetated balanced crystalloid appears to be the preferential treatment strategy in the acute phase after controlled bleeding.

[Air rescue: current significance and practical issues]

Germany has a nationwide and powerful helicopter emergency medical services system (HEMS), which executes primary rescue missions and interhospital transfer of intensive care patients. In recent years the range of HEMS missions has become modified due to demographic changes and structural changes in the healthcare system. Furthermore, the number of HEMS missions is steadily increasing. If reasonably used air rescue contributes to desired reductions in overall preclinical time. Moreover, it facilitates prompt transport of patients to a hospital suitable for definitive medical care and treatment can be initiated earlier which is a particular advantage for severely injured and critically ill patients. Because of complex challenges during air rescue missions the qualifications of the HEMS personnel have to be considerably higher in comparison with ground based emergency medical services.

[Improvement of emergency physician education through simulator training. Consideration on the basis of the model project "NASimSaar25"]

BACKGROUND

Prehospital emergency medicine is a challenge for trainee emergency physicians. Rare injuries and diseases as well as patients in extreme age groups can unexpectedly face emergency physicians. In the regulations on medical education the German Medical Association requires participation in 50 emergency missions under the supervision of an experienced emergency physician. This needs to be improved because on-the-job training does not generally represent the whole spectrum of emergency medicine and a good and structured training under on call conditions is nearly impossible.

AIM

The subject of the model project described was whether practical training for emergency physicians can be achieved by participation in simulation training instead of real emergency situations.

MATERIAL AND METHODS

After modification of the Saarland regulations on medical education it was possible to replace up to 25 participations in emergency missions by simulation training. The concept of the course NASimSaar25 requires participants to complete 25 simulator cases in 3 days in small training groups. Emergency situations from all medical disciplines need to be treated. A special focus is on the treatment of life-threatening and rare diseases and injuries. Modern simulators and actors are used. The debriefings are conducted by experienced tutors based on approved principles. Medical contents, learning targets from the field of crew resource management (CRM) and soft skills are discussed in these debriefings.

RESULTS

Education in the field of emergency medicine can be improved by simulator-based learning and training. However, practical work under a tutor in real and clinical experience cannot be completely replaced by simulation. Simulator training can only be successful if theoretical knowledge has already been acquired.

CONCLUSION

A simulator-based course concept can result in an improvement of emergency medical education. The model project NASimSaar25 was well received by the target audience and mostly very well evaluated in terms of learning and reality. If this project becomes established the demand on simulation-based training will increase. The training should achieve a consistent standard of quality.

[On-scene times for helicopter services. Influence of central dispatch center strategy]

BACKGROUND

Previous studies have suggested that when using several emergency systems and air rescue prehospital and on-scene times are extended, depending on the dispatch strategy. Emergency medical services (EMS) in Germany are delivered by ambulances (AMB) staffed by paramedics alone or with physicians (EMD) and by helicopter emergency medical services (HEMS) always staffed by both. The advantages of HEMS in countries with short transport distances and high hospital density are controversial. The best dispatching strategy for HEMS has not been determined

OBJECTIVE

The BoLuS study in the German state of Hessen was designed to evaluate the influence of dispatch strategy on prehospital times for responses involving both HEMS and EMS.

METHODS

Rescue responses involving HEMS were prospectively evaluated in 12 regions of Hessen from July 2010 to September 2011. Although all regions had access to HEMS, only one had its own service. Data from both central dispatch centers and helicopter services were collected and combined to calculate the on-scene time (OST) and correlate it with dispatch strategy.

RESULTS

A total of 2111 emergency interventions were evaluated. Internal medicine emergencies accounted for 42.9 % of cases and trauma for 36.7 %. Just one patient was involved in 87.9 % of rescues. Two services were involved in 65.3 % of rescues and three or more in 31.5 %. The most common dispatch categories were initial dispatch of EMS and HEMS (50.6 %), initial dispatch of EMS with later request for HEMS (19.7 %) and initial dispatch of both EMS and EMD with later request for HEMS (17.4 %). The OST for these categories were 31.0 ± 13.7 min, 43.7 ± 16.2 min and 54.6 ± 21.3 min (p < 0.01), respectively.

CONCLUSION

OST varies significantly depending on the number of EMS involved and the dispatch strategy. Sequential dispatching of ground and later HEMS wastes time. Getting an emergency physician to the scene as quickly as possible, reducing transport time to an appropriate hospital and caring for more complex emergencies are the main indications for HEMS. If HEMS appears likely to be needed, it should be dispatched immediately.

[Preclinical treatment of multiple trauma : what is important?]

Multiple trauma is still the most common cause of death in the age group below 40 years but rarely occurs in prehospital emergencies in Germany. Therefore, personal experience of emergency physicians in prehospital treatment of multiple trauma is often limited. Priority-based therapy according to standardized algorithms and advances in clinical and intensive care have reduced hospital mortality down to 13 %. Time factors, treatment and transport by Helicopter Emergency Medical Services seem to have had a significant impact on the outcome. The current German multiple trauma S3 guidelines provide algorithms for preclinical treatment. The underlying scientific evidence in this respect is, however, low.

Helicopter emergency medical service inTehran, Iran: a descriptive study

OBJECTIVE

The study provides descriptive information regarding missions performed by Tehran helicopter emergency medical services (HEMS) during a 1-year period.

METHODS

All patients transferred by Tehran HEMS between March 2006 and March 2007 were enrolled in this descriptive study. Based on HEMS records, information was gathered on flight time, the number of patients transferred in each flight, and mission outcomes.

RESULTS

During the 1-year study, a total of 353 patients were transported via 138 helicopter flights to 4 medical care centers in Tehran. The mean flight time, the time from the initial call until the patient was delivered to a medical facility, was 36.56 ± 18.44 minutes.

CONCLUSION

Tehran HEMS is still far from attaining optimal values, particularly regarding flight time. More efforts are needed to improve the timing as a component of care and the quality of care provided by this system.

Factors impacting on the activation and approach times of helicopter emergency medical services in four Alpine countries

Background

The outcome of severely injured or ill patients can be time dependent. Short activation and approach times for emergency medical service (EMS) units are widely recognized to be important quality indicators. The use of a helicopter emergency medical service (HEMS) can significantly shorten rescue missions especially in mountainous areas. We aimed to analyze the HEMS characteristics that influence the activation and approach times.

Methods

In a multi-centre retrospective study, we analyzed 6121 rescue missions from nine HEMS bases situated in mountainous regions of four European countries.

Results

We found large differences in mean activation and approach times among HEMS bases. The shortest mean activation time was 2.9 minutes; the longest 17.0 minutes. The shortest mean approach time was 10.4 minutes; the longest 45.0 minutes. Short times are linked (p < 0.001) to the following conditions: helicopter operator is not state owned; HEMS is integrated in EMS; all crew members are at the same location; doctors come from state or private health institutions; organization performing HEMS is privately owned; helicopters are only for HEMS; operation area is around 10.000 km2; HEMS activation is by a dispatching centre of regional government who is in charge of making decisions; there is only one intermediator in the emergency call; helicopter is equipped with hoist or fixed line; HEMS has more than one base with helicopters, and one team per base; closest neighboring base is 90 km away; HEMS is about 20 years old and has more than 650 missions per year; and modern helicopters are used.

Conclusions

An improvement in HEMS activation and approach times is possible. We found 17 factors associated with shorter times.

[Emergency anesthesia, airway management and ventilation in major trauma. Background and key messages of the interdisciplinary S3 guidelines for major trauma patients]

Patients with multiple trauma presenting with apnea or a gasping breathing pattern (respiratory rate  < 6/min) require prehospital endotracheal intubation (ETI) and ventilation. Additional indications are hypoxia (S(p)O(2)  < 90% despite oxygen insufflation and after exclusion of tension pneumothorax), severe traumatic brain injury [Glasgow Coma Scale (GCS)  < 9], trauma-associated hemodynamic instability [systolic blood pressure (SBP)  < 90 mmHg] and severe chest trauma with respiratory insufficiency (respiratory rate  > 29/min). The induction of anesthesia after preoxygenation is conducted as rapid sequence induction (analgesic, hypnotic drug, neuromuscular blocking agent). With the availability of ketamine as a viable alternative, the use of etomidate is not encouraged due to its side effects on adrenal function. An electrocardiogram (ECG), blood pressure measurement and pulse oximetry are needed to monitor the emergency anesthesia and the secured airway. Capnography is absolutely mandatory to confirm correct placement of the endotracheal tube and to monitor tube dislocations as well as ventilation in the prehospital and hospital setting. Because airway management is often complicated in trauma patients, alternative devices need to be available preclinical and a fiber-optic endoscope should be available within the hospital. Use of these alternative measures for airway management and ventilation should be considered at the latest after a maximum of three unsuccessful endotracheal intubation attempts. Emergency medical service (EMS) physicians should to be trained in emergency anesthesia, ETI and alternative methods of airway management on a regular basis. Within hospitals ETI, emergency anesthesia and ventilation are to be conducted by trained and experienced anesthesiologists. When a difficult airway or induction of anesthesia is expected, endotracheal intubation should be supervised or conducted by an anesthesiologist. Normoventilation should be the goal of mechanical ventilation. After arrival in the resuscitation room the ventilation will be controlled and guided with the help of arterial blood gas analyses. After temporary removal of a cervical collar, the cervical spine needs to be immobilized by means of manual in-line stabilization when securing the airway.

[Emergency anesthesia, airway management and ventilation in major trauma. Background and key messages of the interdisciplinary S3 guidelines for major trauma patients]

Patients with multiple trauma presenting with apnea or a gasping breathing pattern (respiratory rate <6/min) require prehospital endotracheal intubation (ETI) and ventilation. Additional indications are hypoxia (S(p)O(2)<90% despite oxygen insufflation and after exclusion of tension pneumothorax), severe traumatic brain injury [Glasgow Coma Scale (GCS)<9], trauma-associated hemodynamic instability [systolic blood pressure (SBP)<90 mmHg] and severe chest trauma with respiratory insufficiency (respiratory rate >29/min). The induction of anesthesia after preoxygenation is conducted as rapid sequence induction (analgesic, hypnotic drug, neuromuscular blocking agent). With the availability of ketamine as a viable alternative, the use of etomidate is not encouraged due to its side effects on adrenal function. An electrocardiogram (ECG), blood pressure measurement and pulse oximetry are needed to monitor the emergency anesthesia and the secured airway. Capnography is absolutely mandatory to confirm correct placement of the endotracheal tube and to monitor tube dislocations as well as ventilation and oxygenation in the prehospital and hospital setting. Because airway management is often complicated in trauma patients, alternative devices and a fiber-optic endoscope need to be available within the hospital. Use of these alternative measures for airway management and ventilation should be considered at the latest after a maximum of three unsuccessful intubation attempts. Emergency medical service (EMS) physicians should to be trained in emergency anesthesia, ETI and alternative methods of airway management on a regular basis. Within hospitals ETI, emergency anesthesia and ventilation are to be conducted by trained and experienced anesthesiologists. When a difficult airway or induction of anesthesia is expected, endotracheal intubation should be supervised or conducted by an anesthesiologist. Normoventilation should be the goal of mechanical ventilation. After arrival in the resuscitation room the ventilation will be controlled and guided with the help of arterial blood gas analyses. After temporary removal of a cervical collar, the cervical spine needs to be immobilized by means of manual in-line stabilization when securing the airway.

[The White Paper on treating medical emergencies preclinically and at hospital : how can it be implemented?]

Up-to-date management of medical emergencies implies primarily that definitive diagnoses and treatment are performed in a timely manner. These claims have been reconfirmed in 2007 by the leading German language medical associations in their "White Paper on Emergency Treatment". To actually realize the demands described in this paper a timely, transsectoral and close collaboration of all involved organizations is mandatory. To illustrate this race against cell death the phrase relay of survival is proposed and launched to replace the hitherto used but rigid concept of chain of survival. The tasks of each member of this relay of survival are critically scrutinized one after the other from a patient perspective. The paper presents tangible recommendations for improving the respective individual performance as well as, in particular, the cooperation and coordination between the team members which is comparable to handing over the baton in a relay race.