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Albargi H, Alharbi RJ, Almuwallad A, Harthi N, Khormi Y, Kanthimathinathan HK, Chowdhury S. Traumatic head injuries in children: demographics, injury patterns, and outcomes in Saudi Arabia. Int J Emerg Med 2025; 18:3. [PMID: 39748284 PMCID: PMC11697731 DOI: 10.1186/s12245-024-00808-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2024] [Accepted: 12/25/2024] [Indexed: 01/04/2025] Open
Abstract
BACKGROUND Traumatic head injuries (THIs) are among the leading cause of mortality and intensive care unit (ICU) admission in children worldwide. Most of the published literature concerning THIs arises predominantly from North America and Europe. However, only limited data about the incidence, characteristics and impact on children in Saudi Arabia exists. METHODS We conducted a retrospective analysis of THIs in children (≤ 18 years of age) using data from the Saudi TraumA Registry (STAR) from August 2017 to December 2022. Data included patient demographic characteristics, the mechanism, type and severity of injury. We used multivariable logistic regression to assess the association between outcomes and clinical factors. RESULTS We identified 466 children with THI. Most children were over six years of age (69.5%) and male (76.6%). Motor vehicle crashes (MVCs) were the most common cause of THIs (51.9%), with falls being more common in infants (69.8%). Over half of the children required ICU admission. Children with higher injury severity score, heart rate at presentation to the ED, hospital stay duration, respiratory assistance and need for surgery were more likely to require ICU admission. The overall mortality rate was 7.7%, with schoolchildren (age: 6-12 years) having the highest mortality rate (10.8%). Higher rates of ICU admission were associated with increases in the injury severity score (ISS), hospital stay duration, respiratory assistance and the need for surgery. CONCLUSIONS Children in the 6-12 year age-group had the highest mortality rate, reflecting high injury severities associated with increased ICU admissions. These findings highlight the importance of targeting preventive measures for MVCs in older children and improving trauma care for severe cases. CLINICAL TRIAL NUMBER Not applicable.
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Affiliation(s)
- Hussin Albargi
- Programme of Emergency Medical Service, College of Nursing and Health Science, Jazan University, Al Maarefah Rd, Jazan, 45142, Saudi Arabia.
| | - Rayan Jafnan Alharbi
- Programme of Emergency Medical Service, College of Nursing and Health Science, Jazan University, Al Maarefah Rd, Jazan, 45142, Saudi Arabia
| | - Ateeq Almuwallad
- Programme of Emergency Medical Service, College of Nursing and Health Science, Jazan University, Al Maarefah Rd, Jazan, 45142, Saudi Arabia
| | - Naif Harthi
- Programme of Emergency Medical Service, College of Nursing and Health Science, Jazan University, Al Maarefah Rd, Jazan, 45142, Saudi Arabia
| | - Yahya Khormi
- Department of Surgery, Faculty of Medicine, Jazan University, Jazan, Saudi Arabia
- Department of Neurosurgery, King Fahd Central Hospital, Jazan, Saudi Arabia
| | | | - Sharfuddin Chowdhury
- Trauma Centre, King Saud Medical City, Riyadh, Saudi Arabia
- School of Health Professions, University of Alabama at Birmingham, Birmingham, AL, USA
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Weegenaar C, Perkins Z, Lockey D. Pre-hospital management of traumatic cardiac arrest 2024 position statement: Faculty of Prehospital Care, Royal College of Surgeons of Edinburgh. Scand J Trauma Resusc Emerg Med 2024; 32:139. [PMID: 39741363 DOI: 10.1186/s13049-024-01304-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2024] [Accepted: 12/04/2024] [Indexed: 01/02/2025] Open
Affiliation(s)
- Celestine Weegenaar
- Faculty of Pre-Hospital Care, Royal College of Surgeons of Edinburgh, Edinburgh, UK
| | - Zane Perkins
- Faculty of Pre-Hospital Care, Royal College of Surgeons of Edinburgh, Edinburgh, UK
| | - David Lockey
- Faculty of Pre-Hospital Care, Royal College of Surgeons of Edinburgh, Edinburgh, UK.
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Lockhart-Bouron M, Baert V, Leteurtre S, Hubert H, Recher M. Association between out-of-hospital cardiac arrest and survival in paediatric traumatic population: results from the French national registry. Eur J Emerg Med 2023; 30:186-192. [PMID: 37040661 DOI: 10.1097/mej.0000000000001024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
Trauma is an important cause of paediatric out-of-hospital cardiac arrest (OHCA) with a high mortality rate. The first aim of this study was to compare the survival rate at day 30 and at hospital discharge following paediatric traumatic and medical OHCA. The second aim was to compare the rates of return of spontaneous circulation and survival rates at hospital admission (Day 0). This multicentre comparative post-hoc study was conducted between July 2011 and February 2022 based on the French National Cardiac Arrest Registry data. All patients aged <18 years with OHCA were included in the study. Patients with traumatic aetiology were matched with those with medical aetiology using propensity score matching. Endpoint was the survival rate at day 30. There were 398 traumatic and 1061 medical OHCAs. Matching yielded 227 pairs. In non-adjusted comparisons, days 0 and 30 survival rates were lower in the traumatic aetiology group than in the medical aetiology group [19.1% vs. 24.0%, odds ratio (OR) 0.75, 95% confidence interval (CI) 0.56-0.99, and 2.0% vs. 4.5%, OR 0.43, 95% CI, 0.20-0.92, respectively]. In adjusted comparisons, day 30 survival rate was lower in the traumatic aetiology group than in the medical aetiology group (2.2% vs. 6.2%, OR 0.36, 95% CI, 0.13-0.99). In this post-hoc analysis, paediatric traumatic OHCA was associated with a lower survival rate than medical cardiac arrest.
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Affiliation(s)
- Marguerite Lockhart-Bouron
- Department of Pediatric Intensive Care, CHU Lille, ULR 2694 - METRICS: Évaluation des technologies de santé et des pratiques médicales, Univ. Lille
| | - Valentine Baert
- Department of Pediatric Intensive Care, CHU Lille, ULR 2694 - METRICS: Évaluation des technologies de santé et des pratiques médicales, Univ. Lille
- Department of French National Out-of-Hospital Cardiac Arrest Registry Research Group - Registre électronique des Arrêts Cardiaques, Lille, France
| | - Stéphane Leteurtre
- Department of Pediatric Intensive Care, CHU Lille, ULR 2694 - METRICS: Évaluation des technologies de santé et des pratiques médicales, Univ. Lille
| | - Hervé Hubert
- Department of Pediatric Intensive Care, CHU Lille, ULR 2694 - METRICS: Évaluation des technologies de santé et des pratiques médicales, Univ. Lille
- Department of French National Out-of-Hospital Cardiac Arrest Registry Research Group - Registre électronique des Arrêts Cardiaques, Lille, France
| | - Morgan Recher
- Department of Pediatric Intensive Care, CHU Lille, ULR 2694 - METRICS: Évaluation des technologies de santé et des pratiques médicales, Univ. Lille
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Henry M, Filipp SL, Aydin EY, Chiriboga N, Zelinka K, Smith LE, Gurka MJ, Irazuzta J, Fonseca Y, Winter MC, Pringle C. Multicentric validation of a prognostic tool for predicting brain death following out-of-hospital cardiac arrest in children. Resuscitation 2023; 185:109727. [PMID: 36764571 PMCID: PMC10065949 DOI: 10.1016/j.resuscitation.2023.109727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/25/2023] [Accepted: 02/02/2023] [Indexed: 02/11/2023]
Abstract
AIM Out-of-hospital cardiac arrest (OHCA) in pediatric patients is associated with high rates of mortality and neurologic injury, with no definitive evidence-based method to predict outcomes available. A prognostic scoring tool for adults, The Brain Death After Cardiac Arrest (BDCA) score, was recently developed and validated. We aimed to validate this score in pediatric patients. METHODS Retrospective cohort study of pediatric patients admitted to 5 PICUs after OHCA between 2011 and 2021. We extracted BDCA score elements for those who survived at least 24 hours but died as a result of their OHCA. We assessed score discrimination for the definitive outcome of brain death. Subgroup analysis was performed for infants < 12mo versus children ≥ 12mo, those who likely had brain death but had withdrawal of life sustaining therapy (WLST) prior to declaration, and by etiology and duration of arrest. RESULTS 389 subjects were identified across 5 institutions, with 282 meeting inclusion criteria. 169 (59.9%) were formally declared brain dead; 58 (20.6%) had findings consistent with brain death but had withdrawal of life sustaining therapies prior to completion of formal declaration. Area under the receiver operating characteristic curve for the age ≥ 12mo cohort was 0.82 [95% CI 0.75, 0.90], which mirrored the adult subject AUCs of 0.82 [0.77, 0.86] and 0.81 [0.76, 0.86] in the development and validation cohorts. Scores demonstrated worse discrimination in the infant cohort (AUC = 0.61). CONCLUSIONS The BDCA score shows promise in children ≥ 12mo following OHCA and may be considered in conjunction with existing multimodal prognostication approaches.
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Affiliation(s)
- Matthew Henry
- College of Medicine, Department of Pediatrics, Critical Care Medicine, University of Florida, PO Box 100296, Gainesville, FL 32610, United States.
| | - Stephanie L Filipp
- College of Medicine, Department of Pediatrics, Pediatric Research Hub, University of Florida, United States
| | - Elber Yuksel Aydin
- College of Medicine, Department of Pediatrics, Critical Care Medicine, University of Florida-Jacksonville, United States
| | - Nicolas Chiriboga
- Pediatric Neurocritical Care, Northwestern University Feinberg School of Medicine, United States
| | - Kailea Zelinka
- Department of Pediatrics, Critical Care Medicine, University of Maryland, United States
| | - Lorena Espinosa Smith
- Children's Hospital Los Angeles, Department of Anesthesiology Critical Care Medicine, United States
| | - Matthew J Gurka
- College of Medicine, Department of Pediatrics, Pediatric Research Hub, University of Florida, United States
| | - Jose Irazuzta
- College of Medicine, Department of Pediatrics, Critical Care Medicine, University of Florida-Jacksonville, United States
| | - Yudy Fonseca
- Department of Pediatrics, Critical Care Medicine, University of Maryland School of Medicine, United States
| | - Meredith C Winter
- Children's Hospital Los Angeles, Department of Anesthesiology Critical Care Medicine, United States; University of Southern California Keck School of Medicine, Department of Pediatrics, United States
| | - Charlene Pringle
- College of Medicine, Department of Pediatrics, Critical Care Medicine, University of Florida, PO Box 100296, Gainesville, FL 32610, United States
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Stewart S, Briggs KB, Fraser JA, Svetanoff WJ, Waddell V, Oyetunji TA. Pre-hospital CPR after traumatic arrest: Outcomes at a level 1 pediatric trauma center. Injury 2023; 54:15-18. [PMID: 36229246 DOI: 10.1016/j.injury.2022.09.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 09/21/2022] [Accepted: 09/28/2022] [Indexed: 02/02/2023]
Abstract
BACKGROUND The survival of traumatic cardiopulmonary arrest (TCA) requiring pre-hospital cardiopulmonary resuscitation (P-CPR) is abysmal across age groups. We aim to describe the mechanisms of injury and outcomes of children suffering from TCA leading to P-CPR at our institution. METHODS A retrospective review was conducted to identify children ages 0-17 years who suffered TCA leading to P-CPR at our institution between 5/2009 and 3/2020. For analysis, patients were stratified into those still undergoing CPR at arrival and those who attained pre-hospital return of spontaneous circulation (ROSC). Primary outcome was discharge alive from the hospital. RESULTS P-CPR was initiated for 48 patients who had TCA; 23 had pre-hospital ROSC. Of the 25 children undergoing CPR at presentation, none survived to discharge. The median duration of CPR, from initiation to time of death declaration was 34 min [29,50]. Seventeen patients died after resuscitation attempts in the ED, while 8 died after admission to the PICU. Of the 23 patients who attained pre-hospital ROSC, 6 survived to discharge. All survivors required intensive rehabilitation services at discharge and at most recent follow-up, 5 had residual deficits requiring medical attention. CONCLUSION There are poor outcomes in children with pre-hospital traumatic cardiopulmonary arrest, particularly in those without pre-hospital ROSC. These data further support the need for standardized guidelines for resuscitation in children with traumatic cardiopulmonary arrest.
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Affiliation(s)
- Shai Stewart
- Department of Surgery, Children's Mercy Hospital, United States; School of Medicine, Kansas City University, United States.
| | - Kayla B Briggs
- Department of Surgery, Children's Mercy Hospital, United States; School of Medicine, Kansas City University, United States
| | - James A Fraser
- Department of Surgery, Children's Mercy Hospital, United States; School of Medicine, Kansas City University, United States
| | - Wendy Jo Svetanoff
- Department of Surgery, Children's Mercy Hospital, United States; School of Medicine, Kansas City University, United States
| | - Valerie Waddell
- Department of Surgery, Children's Mercy Hospital, United States; School of Medicine, Kansas City University, United States
| | - Tolulope A Oyetunji
- Department of Surgery, Children's Mercy Hospital, United States; Quality Improvement and Surgical Equity Research (QISER) Center, United States; School of Medicine, Kansas City University, United States
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Gowens P, Smith K, Clegg G, Williams B, Nehme Z. Global variation in the incidence and outcome of emergency medical services witnessed out-of-hospital cardiac arrest: A systematic review and meta-analysis. Resuscitation 2022; 175:120-132. [PMID: 35367317 DOI: 10.1016/j.resuscitation.2022.03.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/04/2022] [Accepted: 03/23/2022] [Indexed: 01/27/2023]
Abstract
AIM OF THE REVIEW To examine global variation in the incidence and outcomes of emergency medical services (EMS) witnessed out-of-hospital cardiac arrest (OHCA). DATA SOURCES We systematically reviewed four electronic databases for studies between 1990 and 5th April 2021 reporting EMS-witnessed OHCA populations. Studies were included if they reported sufficient data to calculate the primary outcome of survival to hospital discharge or 30-day survival. Random-effects models were used to pool incidence and survival outcomes, and meta-regression was used to examine sources of heterogeneity. Study quality was appraised using the Joanna Briggs Institute critical appraisal tools. RESULTS The search returned 1178 non-duplicate titles of which 66 articles comprising 133,981 EMS-witnessed patients treated by EMS across 33 countries were included. All but one study was observational and only 12 studies (18%) were deemed to be at low risk of bias. The pooled incidence of EMS-treated cases was 4.1 per 100,000 person-years (95% CI: 3.5, 4.7), varying almost 4-fold across continents. The pooled proportion of survivors to hospital discharge or 30-days was 20% overall (95% CI: 18%, 22%; I2 = 98%), 43% (95% CI: 37%, 49%; I2 = 94%) for initial shockable rhythms and 6% (95% CI: 5%, 8%; I2 = 79%) for initial non-shockable rhythms. In the meta-regression analysis, only region and aetiology were significantly associated with survival. When compared to studies from North America, pooled survival was significantly higher in studies from Europe (14% vs. 26%; p = 0.04) and Australasia (14% vs. 31%, p < 0.001). CONCLUSION We identified significant global variation in the incidence and survival outcome of EMS-witnessed OHCA. Further research is needed to understand the factors contributing to these variations.
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Affiliation(s)
- Paul Gowens
- Research Development and Innovation Hub, Scottish Ambulance Service, Edinburgh, Scotland; Resuscitation Research Group, University of Edinburgh, Edinburgh, Scotland
| | - Karen Smith
- Centre for Research and Evaluation, Ambulance Victoria, Blackburn North, Victoria, Australia; Department of Paramedicine, Monash University, Frankston, Victoria, Australia; Department of Epidemiology and Preventive Medicine, Monash University, Prahran, Victoria, Australia
| | - Gareth Clegg
- Research Development and Innovation Hub, Scottish Ambulance Service, Edinburgh, Scotland; Resuscitation Research Group, University of Edinburgh, Edinburgh, Scotland
| | - Brett Williams
- Department of Paramedicine, Monash University, Frankston, Victoria, Australia
| | - Ziad Nehme
- Centre for Research and Evaluation, Ambulance Victoria, Blackburn North, Victoria, Australia; Department of Paramedicine, Monash University, Frankston, Victoria, Australia; Department of Epidemiology and Preventive Medicine, Monash University, Prahran, Victoria, Australia.
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Van de Voorde P, Turner NM, Djakow J, de Lucas N, Martinez-Mejias A, Biarent D, Bingham R, Brissaud O, Hoffmann F, Johannesdottir GB, Lauritsen T, Maconochie I. [Paediatric Life Support]. Notf Rett Med 2021; 24:650-719. [PMID: 34093080 PMCID: PMC8170638 DOI: 10.1007/s10049-021-00887-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/19/2021] [Indexed: 12/11/2022]
Abstract
The European Resuscitation Council (ERC) Paediatric Life Support (PLS) guidelines are based on the 2020 International Consensus on Cardiopulmonary Resuscitation Science with Treatment Recommendations of the International Liaison Committee on Resuscitation (ILCOR). This section provides guidelines on the management of critically ill or injured infants, children and adolescents before, during and after respiratory/cardiac arrest.
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Affiliation(s)
- Patrick Van de Voorde
- Department of Emergency Medicine, Faculty of Medicine UG, Ghent University Hospital, Gent, Belgien
- Federal Department of Health, EMS Dispatch Center, East & West Flanders, Brüssel, Belgien
| | - Nigel M. Turner
- Paediatric Cardiac Anesthesiology, Wilhelmina Children’s Hospital, University Medical Center, Utrecht, Niederlande
| | - Jana Djakow
- Paediatric Intensive Care Unit, NH Hospital, Hořovice, Tschechien
- Paediatric Anaesthesiology and Intensive Care Medicine, University Hospital Brno, Medical Faculty of Masaryk University, Brno, Tschechien
| | | | - Abel Martinez-Mejias
- Department of Paediatrics and Emergency Medicine, Hospital de Terassa, Consorci Sanitari de Terrassa, Barcelona, Spanien
| | - Dominique Biarent
- Paediatric Intensive Care & Emergency Department, Hôpital Universitaire des Enfants, Université Libre de Bruxelles, Brüssel, Belgien
| | - Robert Bingham
- Hon. Consultant Paediatric Anaesthetist, Great Ormond Street Hospital for Children, London, Großbritannien
| | - Olivier Brissaud
- Réanimation et Surveillance Continue Pédiatriques et Néonatales, CHU Pellegrin – Hôpital des Enfants de Bordeaux, Université de Bordeaux, Bordeaux, Frankreich
| | - Florian Hoffmann
- Pädiatrische Intensiv- und Notfallmedizin, Kinderklinik und Kinderpoliklinik im Dr. von Haunerschen Kinderspital, Ludwig-Maximilians-Universität, München, Deutschland
| | | | - Torsten Lauritsen
- Paediatric Anaesthesia, The Juliane Marie Centre, University Hospital of Copenhagen, Kopenhagen, Dänemark
| | - Ian Maconochie
- Paediatric Emergency Medicine, Faculty of Medicine Imperial College, Imperial College Healthcare Trust NHS, London, Großbritannien
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Van de Voorde P, Turner NM, Djakow J, de Lucas N, Martinez-Mejias A, Biarent D, Bingham R, Brissaud O, Hoffmann F, Johannesdottir GB, Lauritsen T, Maconochie I. European Resuscitation Council Guidelines 2021: Paediatric Life Support. Resuscitation 2021; 161:327-387. [PMID: 33773830 DOI: 10.1016/j.resuscitation.2021.02.015] [Citation(s) in RCA: 187] [Impact Index Per Article: 46.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
These European Resuscitation Council Paediatric Life Support (PLS) guidelines, are based on the 2020 International Consensus on Cardiopulmonary Resuscitation Science with Treatment Recommendations. This section provides guidelines on the management of critically ill infants and children, before, during and after cardiac arrest.
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Affiliation(s)
- Patrick Van de Voorde
- Department of Emergency Medicine Ghent University Hospital, Faculty of Medicine UG, Ghent, Belgium; EMS Dispatch Center, East & West Flanders, Federal Department of Health, Belgium.
| | - Nigel M Turner
- Paediatric Cardiac Anesthesiology, Wilhelmina Children's Hospital, University Medical Center, Utrecht, Netherlands
| | - Jana Djakow
- Paediatric Intensive Care Unit, NH Hospital, Hořovice, Czech Republic; Paediatric Anaesthesiology and Intensive Care Medicine, University Hospital Brno, Medical Faculty of Masaryk University, Brno, Czech Republic
| | | | - Abel Martinez-Mejias
- Department of Paediatrics and Emergency Medicine, Hospital de Terassa, Consorci Sanitari de Terrassa, Barcelona, Spain
| | - Dominique Biarent
- Paediatric Intensive Care & Emergency Department, Hôpital Universitaire des Enfants, Université Libre de Bruxelles, Brussels, Belgium
| | - Robert Bingham
- Hon. Consultant Paediatric Anaesthetist, Great Ormond Street Hospital for Children, London, UK
| | - Olivier Brissaud
- Réanimation et Surveillance Continue Pédiatriques et Néonatales, CHU Pellegrin - Hôpital des Enfants de Bordeaux, Université de Bordeaux, Bordeaux, France
| | - Florian Hoffmann
- Paediatric Intensive Care and Emergency Medicine, Dr. von Hauner Children's Hospital, Ludwig-Maximilians-University, Munich, Germany
| | | | - Torsten Lauritsen
- Paediatric Anaesthesia, The Juliane Marie Centre, University Hospital of Copenhagen, Copenhagen, Denmark
| | - Ian Maconochie
- Paediatric Emergency Medicine, Imperial College Healthcare Trust NHS, Faculty of Medicine Imperial College, London, UK
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Nolan JP, Ornato JP, Parr MJA, Perkins GD, Soar J. Resuscitation highlights in 2020. Resuscitation 2021; 162:1-10. [PMID: 33577963 DOI: 10.1016/j.resuscitation.2021.01.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 01/31/2021] [Indexed: 10/22/2022]
Abstract
BACKGROUND This review is the latest in a series of regular annual reviews undertaken by the editors and aims to highlight some of the key papers published in Resuscitation during 2020. The number of papers submitted to the Journal in 2020 increased by 25% on the previous year.MethodsHand-searching by the editors of all papers published in Resuscitation during 2020. Papers were selected based on then general interest and novelty and were categorised into general themes.ResultsA total of 103 papers were selected for brief mention in this review.ConclusionsResuscitation science continues to evolve rapidly and incorporate all links in the chain of survival.
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Affiliation(s)
- J P Nolan
- University of Warwick, Warwick Medical School, Coventry, CV4 7AL, UK; Anaesthesia and Intensive Care Medicine, Royal United Hospital, Bath, BA1 3NG, UK.
| | - J P Ornato
- Department of Emergency Medicine, Virginia Commonwealth University Health, Richmond, VA, USA.
| | - M J A Parr
- Intensive Care, Liverpool and Macquarie University Hospitals, University of New South Wales and Macquarie University, Sydney, Australia.
| | - G D Perkins
- Critical Care Medicine, University of Warwick, Warwick Medical School and University Hospitals Birmingham NHS Foundation Trust, Coventry, CV4 7AL, UK.
| | - J Soar
- Anaesthesia and Intensive Care Medicine, Southmead Hospital, North Bristol NHS Trust, Bristol, BS10 5NB, UK.
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