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(HEMS) Rescue Missions with Helicopter Hoist Operations: Analys

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(HEMS) Rescue Missions with Helicopter Hoist Operations: Analys Pietsch et al. Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine (2021) 29:92 https://doi.org/10.1186/s13049-021-00898-y ORIGINAL RESEARCH Open Access Incidence and challenges of helicopter emergency medical service (HEMS) rescue missions with helicopter hoist operations: analysis of 11,228 daytime and nighttime missions in Switzerland Urs Pietsch1,2,3,4*, Jürgen Knapp2,5, Michael Mann2, Lorenz Meuli6, Volker Lischke2, Mario Tissi4, Stephen Sollid7,8, Simon Rauch9,10, Volker Wenzel11, Stefan Becker4 and Roland Albrecht1,4 Abstract Objective: We aimed to investigate the medical characteristics of helicopter hoist operations (HHO) in HEMS missions. Methods: We designed a retrospective study evaluating all HHO and other human external cargo (HEC) missions performed by Swiss Air-Rescue (Rega) between January 1, 2010, and December 31, 2019. Results: During the study period, 9,963 (88.7 %) HEMS missions with HHO and HEC were conducted during the day, and 1,265 (11.3 %) at night. Of the victims with time-critical injuries (NACA ≥ 4), 21.1 % (n = 400) reached the hospital within 60 min during the day, and 9.1 % (n = 18) at night. Nighttime missions, a trauma diagnosis, intubation on-site, and NACA Score ≥ 4 were independently and highly significantly associated with longer mission times (p < 0.001). The greatest proportion of patients who needed hoist or HEC operations in the course of the HEMS mission during the daytime sustained moderate injuries (NACA 3, n = 3,731, 37.5 %) while practicing recreational activities (n =5,492, 55.1 %). In daytime HHO missions, the most common medical interventions performed were insertion of a peripheral intravenous access (n = 3,857, 38.7 %) and administration of analgesia (n = 3,121, 31.3 %). Conclusions: Nearly 20 % of patients who needed to be evacuated by a hoist were severely injured, and complex and lifesaving medical interventions were necessary before the HHO procedure. Therefore, only adequately trained and experienced medical crew members should accompany HHO missions. Introduction in the mountains, landing a helicopter is not always pos- Involvement of a helicopter emergency medical service sible, and alternative patient evacuation methods must be (HEMS) can significantly shorten rescue times and im- used. A helicopter hoist operation (HHO) is a common prove the outcome of severely injured patients, especially operational rescue technique used by mountain emer- in mountainous areas [1, 2]. Due to the challenging terrain gency medical services to extricate patients if landing at the scene of the incident is not possible. This helicopter * Correspondence: [email protected] procedure enables both immediate professional medical 1Department of Anaesthesiology and Intensive Care Medicine, Cantonal Hospital St. Gallen, Rorschacher Strasse 95, 9007 St. Gallen, Switzerland care onsite and a safe evacuation of the patient to ensure 2Air Zermatt, Emergency Medical Service, 3920 Zermatt, Switzerland further outcome-relevant timely treatment at an Full list of author information is available at the end of the article © The Author(s). 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Pietsch et al. Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine (2021) 29:92 Page 2 of 8 appropriate hospital. A minority of all HHO missions take comprises seven Airbus H145 at the midland bases and place during the night. Thus, there is less experience in 11 AgustaWestland AW109SP “Da Vinci” helicopters night HHO missions per se. (performance-enhanced version for Rega of the AW109S In Switzerland and most European countries, the Grand) at the alpine bases. More than 11,000 HEMS HEMS crew includes a pilot, a flight paramedic with missions are conducted per year with Rega’s helicopters, additional training as a winch operator, and a physician. and all are equipped with a certified rescue hoist and If the operation site is expected to be in challenging or avionics that permit night operations with and without exposed terrain, a mountain guide joins the team. night vision goggles (NVG) under visual flight rules The deployment of an HEMS physician in the out-of- (VFR), but also under instrument flight rules (IFR). hospital setting is a controversial topic worldwide. The In Switzerland, the HEMS crew includes a pilot, an United States and other English-speaking countries typ- HEMS physician, and a paramedic, who serves as tech- ically provide paramedic-led prehospital trauma care, nical crew member and hoist operator. Inter alia, the re- whereas in other predominantly European countries, quirements for HEMS physicians are a board certification emergency physicians are an integral part of prehospital in anaesthesiology and a certification in pre-hospital emer- HEMS [3, 4]. However, in recent years several countries gency medicine. Several HEMS physicians hold additional (e.g., the United Kingdom, Norway, Finland) have intro- certifications in intensive and critical care medicine and/ duced a supplementary physician-based model for ad- or mountain emergency medicine. In missions, when chal- vanced critical care out of hospital, and in particular for lenging terrain is expected, a rescue specialist with basic HEMS [4]. life support education is added to the crew on board. The .The topic of HHO in HEMS missions is very rarely HEMS physician is either winched down to the site first addressed in the scientific medical literature [3–5]. We or after the rescue specialist’s initial safety assessment of do know that a reduction in visual cues at night poses the environment and situational circumstances. an additional but manageable risk for HEMS operations. The aim of this study was to investigate characteristics Definitions and Statistics of HHO in HEMS, describing the severity of injuries and For this study we analysed mission characteristics, in- the type, frequency and timing of medical interventions. cluding mission duration, time of day, season [6], the National Advisory Committee for Aeronautics score Methods (NACA) [7], and the medical interventions performed Data and Ethics on scene. That included vascular access, analgesia, im- We conducted a retrospective study of all consecutive mobilisation, CPR, and endotracheal intubation (either HHO missions performed by Swiss Air-Rescue (Rega) drug-assisted intubation (RSI) or intubation during car- from January 1, 2010, to December 31, 2019. Data were diac arrest). Nighttime was defined according to the extracted from Rega’s HEMS staff mandatory electronic European Union Aviation Safety Agency (EASA) [8]as medical record system (SAP database), and an additional the period between the end of evening civil twilight and chart review was conducted. The cantonal ethics com- the beginning of morning civil twilight. mittee of St. Gallen (EKOS) reviewed the study design Continuous variables were summarised by mean ± and granted permission for the use of patient data with- standard deviation if normally distributed, or by median out individual patient consent according to the Federal and interquartile range if skewed. Normality was tested Act on Research Involving Human Beings and the Or- using the Shapiro-Wilk test. Categorical variables were dinance on Human Research Except for Clinical Trials. summarised with counts and percentages for each level of The permission covers the processing of patient data the variable. Changes in the number of missions per year from Rega’s HEMS operation (EKOS St. Gallen were assessed by linear regression, and the total number 10.2.2020, BASEC Nr. 2020 − 00252 EKOS 20/020). of missions per base type was compared using Pearson’s Chi-squared test. The Wilcoxon-Mann-Whitney test was Setting and Population used to assess differences in the duration of daytime and In Switzerland, five organisations provide physician- nighttime HHO missions. To further investigate factors staffed HEMS operations 24/7. About 2/3 of these are that are potentially associated with a prolonged duration primary pre-hospital retrieval, and 1/3 provide secondary of HHO missions (mission time was defined as the time inter-hospital transfer. Rega is the largest of these orga- between an emergency call and arrival at the hospital), a nisations, with more than 88,000 HEMS missions in the multivariable linear regression model was built including observation period. Rega operates 12 helicopter bases the binary variables intubation, daytime/nighttime, and and can reach any location in the operational area within trauma versus medical diagnosis as well as
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