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Wolf J, Buckley GJ, Rozanski EA, Fletcher DJ, Boller M, Burkitt-Creedon JM, Weigand KA, Crews M, Fausak ED. 2024 RECOVER Guidelines: Advanced Life Support. Evidence and knowledge gap analysis with treatment recommendations for small animal CPR. J Vet Emerg Crit Care (San Antonio) 2024; 34 Suppl 1:44-75. [PMID: 38924633 DOI: 10.1111/vec.13389] [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: 03/22/2024] [Accepted: 04/25/2024] [Indexed: 06/28/2024]
Abstract
OBJECTIVE To systematically review the evidence and devise clinical recommendations on advanced life support (ALS) in dogs and cats and to identify critical knowledge gaps. DESIGN Standardized, systematic evaluation of literature pertinent to ALS following Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) methodology. Prioritized questions were each reviewed by Evidence Evaluators, and findings were reconciled by ALS Domain Chairs and Reassessment Campaign on Veterinary Resuscitation (RECOVER) Co-Chairs to arrive at treatment recommendations commensurate to quality of evidence, risk:benefit relationship, and clinical feasibility. This process was implemented using an Evidence Profile Worksheet for each question that included an introduction, consensus on science, treatment recommendations, justification for these recommendations, and important knowledge gaps. A draft of these worksheets was distributed to veterinary professionals for comment for 4 weeks prior to finalization. SETTING Transdisciplinary, international collaboration in university, specialty, and emergency practice. RESULTS Seventeen questions pertaining to vascular access, vasopressors in shockable and nonshockable rhythms, anticholinergics, defibrillation, antiarrhythmics, and adjunct drug therapy as well as open-chest CPR were reviewed. Of the 33 treatment recommendations formulated, 6 recommendations addressed the management of patients with nonshockable arrest rhythms, 10 addressed shockable rhythms, and 6 provided guidance on open-chest CPR. We recommend against high-dose epinephrine even after prolonged CPR and suggest that atropine, when indicated, is used only once. In animals with a shockable rhythm in which initial defibrillation was unsuccessful, we recommend doubling the defibrillator dose once and suggest vasopressin (or epinephrine if vasopressin is not available), esmolol, lidocaine in dogs, and/or amiodarone in cats. CONCLUSIONS These updated RECOVER ALS guidelines clarify the approach to refractory shockable rhythms and prolonged CPR. Very low quality of evidence due to absence of clinical data in dogs and cats continues to compromise the certainty with which recommendations can be made.
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Affiliation(s)
- Jacob Wolf
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
| | | | - Elizabeth A Rozanski
- Department of Clinical Sciences, Tufts University School of Veterinary Medicine, North Grafton, Massachusetts, USA
| | - Daniel J Fletcher
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA
| | - Manuel Boller
- VCA Canada Central Victoria Veterinary Hospital, Victoria, British Columbia, Canada
- Faculty of Veterinary Medicine, Department of Veterinary Clinical and Diagnostic Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Jamie M Burkitt-Creedon
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Kelly A Weigand
- Cary Veterinary Medical Library, Auburn University, Auburn, Alabama, USA
- Flower-Sprecher Veterinary Library, Cornell University, Ithaca, New York, USA
| | - Molly Crews
- Department of Small Animal Clinical Sciences, Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, Texas, USA
| | - Erik D Fausak
- University Library, University of California, Davis, Davis, California, USA
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2
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Pocock H, Deakin CD, Lall R, Michelet F, Sun C, Smith D, Hill C, Rai J, Starr K, Brown M, Rodriguez-Bachiller I, Perkins GD. Prehospital optimal shock energy for defibrillation (POSED): A cluster randomised controlled feasibility trial. Resusc Plus 2024; 17:100569. [PMID: 38370312 PMCID: PMC10869912 DOI: 10.1016/j.resplu.2024.100569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/15/2024] [Accepted: 01/25/2024] [Indexed: 02/20/2024] Open
Abstract
Background We explored the feasibility of a large-scale UK ambulance services trial of optimal defibrillation shock energy for out-of-hospital cardiac arrest. The primary objective of this feasibility study was to establish the number of eligible patients and the number recruited. Secondary outcomes were adherence to allocated treatment and data completeness. Methods We conducted a three-arm parallel group cluster randomised controlled feasibility study in a single ambulance service in southern England. Adult patients in out-of-hospital cardiac arrest treated for a shockable rhythm were included. Zoll X series defibrillators (clusters) were randomised to deliver 120-150-200 J, 150-200-200 J, or 200-200-200 J shock strategies. Results Between March 2022 and February 2023, we randomised 38 eligible patients (120-150-200 J (n = 12), 150-200-200 J (n = 10), 200-200-200 J (n = 16)) to the study. The recruitment rate per cluster was 0.07 per month. The median patient age was 71 years (IQR 59-81 years); 79% were male. Twenty-eight cardiac arrests (74%) occurred in a private residence, 29 (76%) were witnessed and 32 (84%) patients received bystander CPR. Treatment adherence was 93% and completeness of clinical and electrical outcomes was 86%. At 30 days, 3/36 (8.3%) patients survived; we were unable to collect survival outcomes for two patients. Defibrillation data collection became difficult when defibrillators became separated from their allocated vehicles. Conclusion We have demonstrated the feasibility of a cluster randomised controlled trial of optimal shock energy for defibrillation in a UK ambulance service. We have identified possible solutions to issues relating to trial design.
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Affiliation(s)
- Helen Pocock
- South Central Ambulance NHS Foundation Trust, Talisman Way, Bicester, Oxfordshire OX26 6HR, UK
- Warwick Clinical Trials Unit, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, Warwickshire, UK
| | - Charles D Deakin
- South Central Ambulance NHS Foundation Trust, Talisman Way, Bicester, Oxfordshire OX26 6HR, UK
- University Hospitals Southampton NHS Foundation Trust, Tremona Road, Southampton, Hampshire, UK
| | - Ranjit Lall
- Warwick Clinical Trials Unit, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, Warwickshire, UK
| | - Felix Michelet
- Warwick Clinical Trials Unit, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, Warwickshire, UK
| | - Chu Sun
- Warwick Clinical Trials Unit, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, Warwickshire, UK
| | - Deb Smith
- Warwick Clinical Trials Unit, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, Warwickshire, UK
| | - Catherine Hill
- Warwick Clinical Trials Unit, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, Warwickshire, UK
| | - Jeskaran Rai
- Warwick Clinical Trials Unit, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, Warwickshire, UK
| | - Kath Starr
- Warwick Clinical Trials Unit, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, Warwickshire, UK
| | - Martina Brown
- South Central Ambulance NHS Foundation Trust, Talisman Way, Bicester, Oxfordshire OX26 6HR, UK
| | | | - Gavin D. Perkins
- Warwick Clinical Trials Unit, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, Warwickshire, UK
- University Hospitals Birmingham NHS Foundation Trust, Mindelsohn Way, Edgbaston, Birmingham B15 2GW, Warwickshire, UK
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3
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Gentile FR, Wik L, Isasi I, Baldi E, Aramendi E, Steen-Hansen JE, Fasolino A, Compagnoni S, Contri E, Palo A, Primi R, Bendotti S, Currao A, Quilico F, Vicini Scajola L, Lopiano C, Savastano S. Amplitude spectral area of ventricular fibrillation and defibrillation success at low energy in out-of-hospital cardiac arrest. Intern Emerg Med 2023; 18:2397-2405. [PMID: 37556074 DOI: 10.1007/s11739-023-03386-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 07/25/2023] [Indexed: 08/10/2023]
Abstract
The optimal energy for defibrillation has not yet been identified and very often the maximum energy is delivered. We sought to assess whether amplitude spectral area (AMSA) of ventricular fibrillation (VF) could predict low energy level defibrillation success in out-of-hospital cardiac arrest (OHCA) patients. This is a multicentre international study based on retrospective analysis of prospectively collected data. We included all OHCAs with at least one manual defibrillation. AMSA values were calculated by analyzing the data collected by the monitors/defibrillators used in the field (Corpuls 3 and Lifepak 12/15) and using a 2-s-pre-shock electrocardiogram interval. We run two different analyses dividing the shocks into three tertiles (T1, T2, T3) based on AMSA values. 629 OHCAs were included and 2095 shocks delivered (energy ranging from 100 to 360 J; median 200 J). Both in the "extremes analysis" and in the "by site analysis", the AMSA values of the effective shocks at low energy were significantly higher than those at high energy (p = 0.01). The likelihood of shock success increased significantly from the lowest to the highest tertile. After correction for age, call to shock time, use of mechanical CPR, presence of bystander CPR, sex and energy level, high AMSA value was directly associated with the probability of shock success [T2 vs T1 OR 3.8 (95% CI 2.5-6) p < 0.001; T3 vs T1 OR 12.7 (95% CI 8.2-19.2), p < 0.001]. AMSA values are associated with the probability of low-energy shock success so that they could guide energy optimization in shockable cardiac arrest patients.
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Affiliation(s)
- Francesca R Gentile
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy
- University of Pavia, Pavia, Italy
| | - Lars Wik
- Division of Prehospital Emergency Medicine, Oslo University Hospital, National Service of Competence for Prehospital Acute Medicine (NAKOS), Ullevål Hospital, Oslo, Norway
- Prehospital Clinic, Doctor car, Oslo University Hospital HF, Ullevål Hospital, Oslo, Norway
| | - Iraia Isasi
- BioRes Group, University of the Basque Country, Bilbao, Spain
| | - Enrico Baldi
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy
| | | | | | - Alessandro Fasolino
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy
- University of Pavia, Pavia, Italy
| | - Sara Compagnoni
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy
- University of Pavia, Pavia, Italy
| | - Enrico Contri
- AAT 118 Pavia, Agenzia Regionale Urgenza Emergenza at Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Alessandra Palo
- AAT 118 Pavia, Agenzia Regionale Urgenza Emergenza at Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Roberto Primi
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy
| | - Sara Bendotti
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy
| | - Alessia Currao
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy
| | - Federico Quilico
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy
- University of Pavia, Pavia, Italy
| | - Luca Vicini Scajola
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy
- University of Pavia, Pavia, Italy
| | - Clara Lopiano
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy
- University of Pavia, Pavia, Italy
| | - Simone Savastano
- Division of Cardiology, Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100, Pavia, Italy.
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Abstract
Cardiac arrest is the loss of organized cardiac activity. Unfortunately, survival to hospital discharge is poor, despite recent scientific advances. The goals of cardiopulmonary resuscitation (CPR) are to restore circulation and identify and correct an underlying etiology. High-quality compressions remain the foundation of CPR, optimizing coronary and cerebral perfusion pressure. High-quality compressions must be performed at the appropriate rate and depth. Interruptions in compressions are detrimental to management. Mechanical compression devices are not associated with improved outcomes but can assist in several situations.
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Affiliation(s)
- Brit Long
- Brooke Army Medical Center, Fort Sam Houston, TX, USA.
| | - Michael Gottlieb
- Department of Emergency Medicine, Rush University Medical Center, Chicago, IL, USA. https://twitter.com/MGottliebMD
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5
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Dreyfuss A, Carlson GK. Defibrillation in the Cardiac Arrest Patient. Emerg Med Clin North Am 2023; 41:529-542. [PMID: 37391248 DOI: 10.1016/j.emc.2023.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/02/2023]
Abstract
Defibrillation is one of the few interventions known to favorably impact survival in cardiac arrest. In witnessed arrest, survival improves with defibrillation as early as possible, whereas it may improve outcomes to administer high-quality chest compressions for 90 seconds before defibrillation in unwitnessed arrest. Minimizing pre-, peri-, and post-shock pauses has been shown to have mortality benefits. Refractory ventricular fibrillation has high mortality rates, and there is ongoing research into promising adjunctive treatment modalities. There remains no consensus on optimal pad positioning and defibrillation energy level, however, recent data suggest anteroposterior pad placement may be superior to anterolateral placement.
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Affiliation(s)
- Andrea Dreyfuss
- Department of Emergency Medicine, Hennepin Hospital, 701 Park Avenue, Minneapolis, MN 55415, USA.
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6
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Gleva MJ, Sullivan J, Crawford TC, Walcott G, Birgersdotter-Green U, Branch KR, Doshi RN, Kivilaid K, Brennan K, Rowbotham RK, Gustavson LM, Poole JE. Defibrillation effectiveness and safety of the shock waveform used in a contemporary wearable cardioverter defibrillator: Results from animal and human studies. PLoS One 2023; 18:e0281340. [PMID: 36917566 PMCID: PMC10013906 DOI: 10.1371/journal.pone.0281340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 01/17/2023] [Indexed: 03/16/2023] Open
Abstract
INTRODUCTION The wearable cardioverter defibrillator (WCD) is used to protect patients at risk for sudden cardiac arrest. We examined defibrillation efficacy and safety of a biphasic truncated exponential waveform designed for use in a contemporary WCD in three animal studies and a human study. METHODS Animal (swine) studies: #1: Efficacy comparison of a 170J BTE waveform (SHOCK A) to a 150J BTE waveform (SHOCK B) that approximates another commercially available waveform. Primary endpoint first shock success rate. #2: Efficacy comparison of the two waveforms at attenuated charge voltages in swine at three prespecified impedances. Primary endpoint first shock success rate. #3: Safety comparison of SHOCK A and SHOCK B in swine. Primary endpoint cardiac biomarker level changes baseline to 6 and 24 hours post-shock. Human Study: Efficacy comparison of SHOCK A to prespecified goal and safety evaluation. Primary endpoint cumulative first and second shock success rate. Safety endpoint adverse events. RESULTS Animal Studies #1: 120 VF episodes in six swine. First shock success rates for SHOCK A and SHOCK B were 100%; SHOCK A non-inferior to SHOCK B (entire 95% CI of rate difference above -10% margin, p < .001). #2: 2,160 VF episodes in thirty-six swine. Attenuated SHOCK A was non-inferior to attenuated SHOCK B at each impedance (entire 95% CI of rate difference above -10% margin, p < .001). #3: Ten swine, five shocked five times each with SHOCK A, five shocked five times each with SHOCK B. No significant difference in troponin I (p = 0.658) or creatine phosphokinase (p = 0.855) changes from baseline between SHOCK A and SHOCK B. Human Study: Thirteen patients, 100% VF conversion rate. Mild skin irritation from adhesive defibrillation pads in three patients. CONCLUSIONS The BTE waveform effectively and safely terminated induced VF in swine and a small sample in humans. TRIAL REGISTRATION Human study clinical trial registration: URL: https://clinicaltrials.gov; Unique identifier: NCT04132466.
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Affiliation(s)
- Marye J. Gleva
- Division of Cardiology, Department of Medicine, Washington University in Saint Louis School of Medicine in Saint Louis, St. Louis, Missouri, United States of America
- * E-mail:
| | - Joseph Sullivan
- Kestra Medical Technologies, Inc., Redmond, Washington, United States of America
| | - Thomas C. Crawford
- Division of Cardiology, Department of Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Greg Walcott
- Division of Cardiovascular Diseases, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | | | - Kelley R. Branch
- Division of Cardiology, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, United States of America
| | | | | | - Kelly Brennan
- Kestra Medical Technologies, Inc., Redmond, Washington, United States of America
| | - Ron K. Rowbotham
- Kestra Medical Technologies, Inc., Redmond, Washington, United States of America
| | - Laura M. Gustavson
- Kestra Medical Technologies, Inc., Redmond, Washington, United States of America
| | - Jeanne E. Poole
- Division of Cardiology, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, United States of America
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7
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Soar J, Böttiger BW, Carli P, Couper K, Deakin CD, Djärv T, Lott C, Olasveengen T, Paal P, Pellis T, Perkins GD, Sandroni C, Nolan JP. [Adult advanced life support]. Notf Rett Med 2021; 24:406-446. [PMID: 34121923 PMCID: PMC8185697 DOI: 10.1007/s10049-021-00893-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/20/2021] [Indexed: 12/19/2022]
Abstract
These European Resuscitation Council Advanced Life Support guidelines are based on the 2020 International Consensus on Cardiopulmonary Resuscitation Science with Treatment Recommendations. This section provides guidelines on the prevention of and ALS treatments for both in-hospital cardiac arrest and out-of-hospital cardiac arrest.
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Affiliation(s)
- Jasmeet Soar
- Southmead Hospital, North Bristol NHS Trust, Bristol, Großbritannien
| | - Bernd W. Böttiger
- Department of Anaesthesiology and Intensive Care Medicine, Universitätsklinikum Köln, Köln, Deutschland
| | - Pierre Carli
- SAMU de Paris, Center Hospitalier Universitaire Necker Enfants Malades, Assistance Publique Hôpitaux de Paris, and Université Paris Descartes, Paris, Frankreich
| | - Keith Couper
- Critical Care Unit, University Hospitals Birmingham NHS Foundation Trust, Birmingham, Großbritannien
- Warwick Medical School, University of Warwick, Coventry, Großbritannien
| | - Charles D. Deakin
- University Hospital Southampton NHS Foundation Trust, Southampton, Großbritannien
- South Central Ambulance Service NHS Foundation Trust, Otterbourne, Großbritannien
| | - Therese Djärv
- Dept of Acute and Reparative Medicine, Karolinska University Hospital, Stockholm, Schweden
- Department of Medicine Solna, Karolinska Institutet, Stockholm, Schweden
| | - Carsten Lott
- Department of Anesthesiology, University Medical Center, Johannes Gutenberg-Universität Mainz, Mainz, Deutschland
| | - Theresa Olasveengen
- Department of Anesthesiology, Oslo University Hospital and Institute of Clinical Medicine, University of Oslo, Oslo, Norwegen
| | - Peter Paal
- Department of Anaesthesiology and Intensive Care Medicine, Hospitallers Brothers Hospital, Paracelsus Medical University, Salzburg, Österreich
| | - Tommaso Pellis
- Department of Anaesthesia and Intensive Care, Azienda Sanitaria Friuli Occidentale, Pordenone, Italien
| | - Gavin D. Perkins
- Warwick Medical School and University Hospitals Birmingham NHS Foundation Trust, University of Warwick, Coventry, Großbritannien
| | - Claudio Sandroni
- Department of Intensive Care, Emergency Medicine and Anaesthesiology, Fondazione Policlinico Universitario A. Gemelli-IRCCS, Rom, Italien
- Institute of Anaesthesiology and Intensive Care Medicine, Università Cattolica del Sacro Cuore, Rom, Italien
| | - Jerry P. Nolan
- Warwick Medical School, Coventry, Großbritannien, Consultant in Anaesthesia and Intensive Care Medicine Royal United Hospital, University of Warwick, Bath, Großbritannien
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8
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Cheskes S, Drennan IR. Refibrillation after defibrillation: The shocking truth. Resuscitation 2020; 157:269-271. [PMID: 33080367 DOI: 10.1016/j.resuscitation.2020.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 10/07/2020] [Indexed: 11/30/2022]
Affiliation(s)
- Sheldon Cheskes
- Sunnybrook Centre for Prehospital Medicine, Toronto, ON, Canada; University of Toronto, Department of Family and Community Medicine, Division of Emergency Medicine, Toronto, ON, Canada; Li Ka Shing Knowledge Institute, St. Michaels Hospital, Toronto, ON, Canada.
| | - Ian R Drennan
- Sunnybrook Centre for Prehospital Medicine, Toronto, ON, Canada; Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
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9
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Miraglia D, Miguel LA, Alonso W. Double Defibrillation for Refractory In- and Out-of-Hospital Cardiac Arrest: A Systematic Review and Meta-Analysis. J Emerg Med 2020; 59:521-541. [DOI: 10.1016/j.jemermed.2020.06.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/12/2020] [Accepted: 06/01/2020] [Indexed: 02/07/2023]
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10
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Pourmand A, Galvis J, Yamane D. The controversial role of dual sequential defibrillation in shockable cardiac arrest. Am J Emerg Med 2018; 36:1674-1679. [DOI: 10.1016/j.ajem.2018.05.078] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 05/24/2018] [Accepted: 05/31/2018] [Indexed: 12/21/2022] Open
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11
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Dual defibrillation in patients with refractory ventricular fibrillation. Am J Emerg Med 2018; 36:1474-1479. [DOI: 10.1016/j.ajem.2018.04.060] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 04/05/2018] [Accepted: 04/25/2018] [Indexed: 11/21/2022] Open
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Abstract
Cardiac arrest is a leading cause of death in the United States, with a hospital discharge rate of approximately 10%. International resuscitation guidelines offer standardized cardiac arrest management approaches, but beyond the guidelines, are promising innovations to improve resuscitative care. Although clinical data do not yet support the routine use of mechanical chest compressions, corticosteroids, thrombolytics, and adjunctive ventilation devices during arrest, these therapies may have an important role in select patients. Extracorporeal membrane oxygenation during cardiopulmonary resuscitation is a promising advancement and may have survival benefit in select patients. The evidence for standard therapies and these innovations is discussed.
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Affiliation(s)
- Bram J Geller
- Department of Cardiovascular Medicine, University of Pennsylvania, Perelman Center for Advanced Medicine, South Pavilion 11th Floor, 3400 Civic Center Boulevard, Philadelphia, PA 19104, USA.
| | - Benjamin S Abella
- Department of Emergency Medicine, University of Pennsylvania, 3400 Spruce Street Ground Ravdin, Philadelphia, PA 19104, USA
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13
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Chang HC, Lin JF, Yeh KH. Paddle Position and Contact Force: An Important Step to Check When Troubleshooting for Refractory Ventricular Fibrillation. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791602300506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Ventricular fibrillation (VF) is a lethal medical emergency that requires immediate defibrillation. VF is resistant when it persists after three or more defibrillator shocks. Successful defibrillation requires depolarisation of a critical mass of myocardium. Several variables, such as the length of time in VF, body type, total energy used, and energy waveform have been reported to be associated with the success rate of defibrillation. Correct paddle position and good contact force to create an adequate current flow through the heart is essential for defibrillation. We report a patient who developed VF because of acute myocardial infarction that was resistant to a total of 13 shocks. The cause of shock-resistant VF was diagnosed by noticing the skin marks caused by the defibrillator paddle that indicated incorrect paddle position and inadequate paddle force. By checking the skin marks, an emergency physician could make a correct diagnosis within a few seconds and save a patient.
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14
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Defibrillation for Ventricular Fibrillation: A Shocking Update. J Am Coll Cardiol 2017; 70:1496-1509. [PMID: 28911514 DOI: 10.1016/j.jacc.2017.07.778] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 07/24/2017] [Indexed: 01/09/2023]
Abstract
Cardiac arrest is defined as the termination of cardiac activity associated with loss of consciousness, of spontaneous breathing, and of circulation. Sudden cardiac arrest and sudden cardiac death (SCD) are terms often used interchangeably. Most patients with out-of-hospital cardiac arrest have shown coronary artery disease or symptoms during the hour before the event. Cardiac arrest is potentially reversible by cardiopulmonary resuscitation, defibrillation, cardioversion, cardiac pacing, or treatments targeted at the underlying disease (e.g., acute coronary occlusion). We restrict SCD hereafter to cardiac arrest due to ventricular fibrillation, including rhythms shockable by an automatic external defibrillator (AED), implantable cardioverter-defibrillator (ICD), or wearable cardioverter-defibrillator (WCD). We summarize the state of the art related to defibrillation in treating SCD, including a brief history of the evolution of defibrillation, technical characteristics of modern AEDs, strategies to improve AED access and increase survival, ancillary treatments, and use of ICDs or WCDs.
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15
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OKAMURA HIDEO, DESIMONE CHRISTOPHERV, KILLU AMMARM, GILLES EMILYJ, TRI JASON, ASIRVATHAM ROSHINI, LADEWIG DEJAEJ, SUDDENDORF SCOTTH, POWERS JOANNEM, WOOD-WENTZ CHRISTINAM, GRAY PETERD, RAYMOND DOUGLASM, SAVAGE SHELLEYJ, SAVAGE WALTERT, BRUCE CHARLESJ, ASIRVATHAM SAMUELJ, FRIEDMAN PAULA. Evaluation of a Unique Defibrillation Unit with Dual-Vector Biphasic Waveform Capabilities: Towards a Miniaturized Defibrillator. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2017; 40:108-114. [DOI: 10.1111/pace.12979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 10/14/2016] [Accepted: 10/25/2016] [Indexed: 11/29/2022]
Affiliation(s)
- HIDEO OKAMURA
- Division of Cardiovascular Diseases; Mayo Clinic; Rochester Minnesota
| | | | - AMMAR M. KILLU
- Division of Cardiovascular Diseases; Mayo Clinic; Rochester Minnesota
| | | | - JASON TRI
- Division of Cardiovascular Diseases; Mayo Clinic; Rochester Minnesota
| | | | | | | | - JOANNE M. POWERS
- Division of Cardiovascular Surgery; Mayo Clinic; Rochester Minnesota
| | | | - PETER D. GRAY
- Employees and equity owners in CardioThrive; Walnut Creek California
| | | | - SHELLEY J. SAVAGE
- Employees and equity owners in CardioThrive; Walnut Creek California
| | - WALTER T. SAVAGE
- Employees and equity owners in CardioThrive; Walnut Creek California
| | - CHARLES J. BRUCE
- Division of Cardiovascular Diseases; Mayo Clinic; Rochester Minnesota
| | | | - PAUL A. FRIEDMAN
- Division of Cardiovascular Diseases; Mayo Clinic; Rochester Minnesota
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16
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Abstract
Cancer is the second leading cause of death in the United States, with most of these deaths taking place in the hospital setting. Discussions on end-of-life care and on cardiopulmonary resuscitation in particular are an important component in the management of patients with cancer. Clinical decision making and respect for patient autonomy dictate that health care providers provide their patients with accurate information on the expected outcomes of cardiopulmonary resuscitation. This article reviews those factors that affect the outcome of cardiopulmonary resuscitation in patients with cancer and provides recommendations on obtaining do-not-resuscitate orders in these patients.
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Affiliation(s)
- Joseph Varon
- Department of Internal Medicine, University of Texas Health Science Center at Houston, Houston, Texas, USA
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17
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Abstract
Although the occurrence of sudden cardiac death (SCD) in a young person is a rare event, it is traumatic and often widely publicized. In recent years, SCD in this population has been increasingly seen as a public health and safety issue. This review presents current knowledge relevant to the epidemiology of SCD and to strategies for prevention, resuscitation, and identification of those at greatest risk. Areas of active research and controversy include the development of best practices in screening, risk stratification approaches and postmortem evaluation, and identification of modifiable barriers to providing better outcomes after resuscitation of young SCD patients. Institution of a national registry of SCD in the young will provide data that will help to answer these questions.
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Affiliation(s)
- Michael Ackerman
- From Departments of Internal Medicine, Pediatrics, and Molecular Pharmacology & Experimental Therapeutics; Divisions of Cardiovascular Diseases and Pediatric Cardiology; Windland Smith Rice Sudden Death Genomics Laboratory; Mayo Clinic, Rochester, MN (M.A.);Stead Family Department of Pediatrics, Carver College of Medicine, University of Iowa, Iowa, City (D.L.A.); andDepartment of Cardiology, Boston Children's Hospital, MA (J.K.T.)
| | - Dianne L Atkins
- From Departments of Internal Medicine, Pediatrics, and Molecular Pharmacology & Experimental Therapeutics; Divisions of Cardiovascular Diseases and Pediatric Cardiology; Windland Smith Rice Sudden Death Genomics Laboratory; Mayo Clinic, Rochester, MN (M.A.);Stead Family Department of Pediatrics, Carver College of Medicine, University of Iowa, Iowa, City (D.L.A.); andDepartment of Cardiology, Boston Children's Hospital, MA (J.K.T.)
| | - John K Triedman
- From Departments of Internal Medicine, Pediatrics, and Molecular Pharmacology & Experimental Therapeutics; Divisions of Cardiovascular Diseases and Pediatric Cardiology; Windland Smith Rice Sudden Death Genomics Laboratory; Mayo Clinic, Rochester, MN (M.A.);Stead Family Department of Pediatrics, Carver College of Medicine, University of Iowa, Iowa, City (D.L.A.); andDepartment of Cardiology, Boston Children's Hospital, MA (J.K.T.).
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18
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Wilson D, Moehlis J. Toward a More Efficient Implementation of Antifibrillation Pacing. PLoS One 2016; 11:e0158239. [PMID: 27391010 PMCID: PMC4938213 DOI: 10.1371/journal.pone.0158239] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 06/12/2016] [Indexed: 11/18/2022] Open
Abstract
We devise a methodology to determine an optimal pattern of inputs to synchronize firing patterns of cardiac cells which only requires the ability to measure action potential durations in individual cells. In numerical bidomain simulations, the resulting synchronizing inputs are shown to terminate spiral waves with a higher probability than comparable inputs that do not synchronize the cells as strongly. These results suggest that designing stimuli which promote synchronization in cardiac tissue could improve the success rate of defibrillation, and point towards novel strategies for optimizing antifibrillation pacing.
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Affiliation(s)
- Dan Wilson
- Department of Mechanical Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, United States of America
- * E-mail:
| | - Jeff Moehlis
- Department of Mechanical Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, United States of America
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19
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Hopster K, Tüensmeyer J, Kästner SBR. Resuscitation attempts in a foal with sudden cardiac arrest in the early recovery period. EQUINE VET EDUC 2016. [DOI: 10.1111/eve.12143] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- K. Hopster
- Clinic for Horses; University of Veterinary Medicine Hannover; Germany
| | - J. Tüensmeyer
- Clinic for Small Animals; University of Veterinary Medicine Hannover; Germany
| | - S. B. R. Kästner
- Clinic for Horses; University of Veterinary Medicine Hannover; Germany
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20
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Bradley SM, Liu W, Chan PS, Nallamothu BK, Grunwald GK, Self A, Sasson C, Varosy PD, Anderson ML, Schneider PM, Ho PM. Defibrillation time intervals and outcomes of cardiac arrest in hospital: retrospective cohort study from Get With The Guidelines-Resuscitation registry. BMJ 2016; 353:i1653. [PMID: 27052620 PMCID: PMC4823520 DOI: 10.1136/bmj.i1653] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To describe temporal trends in the time interval between first and second attempts at defibrillation and the association between this time interval and outcomes in patients with persistent ventricular tachycardia or ventricular fibrillation (VT/VF) arrest in hospital. DESIGN Retrospective cohort study SETTING 172 hospitals in the United States participating in the Get With The Guidelines-Resuscitation registry, 2004-12. PARTICIPANTS Adults who received a second defibrillation attempt for persistent VT/VF arrest within three minutes of a first attempt. INTERVENTIONS Second defibrillation attempts categorized as early (time interval of up to and including one minute between first and second defibrillation attempts) or deferred (time interval of more than one minute between first and second defibrillation attempts). MAIN OUTCOME MEASURE Survival to hospital discharge. RESULTS Among 2733 patients with persistent VT/VF after the first defibrillation attempt, 1121 (41%) received a deferred second attempt. Deferred second defibrillation for persistent VT/VF increased from 26% in 2004 to 57% in 2012 (P<0.001 for trend). Compared with early second defibrillation, unadjusted patient outcomes were significantly worse with deferred second defibrillation (57.4% v 62.5% for return of spontaneous circulation, 38.4% v 43.6% for survival to 24 hours, and 24.7% v 30.8% for survival to hospital discharge; P<0.01 for all comparisons). After risk adjustment, deferred second defibrillation was not associated with survival to hospital discharge (propensity weighting adjusted risk ratio 0.89, 95% confidence interval 0.78 to 1.01; P=0.08; hierarchical regression adjusted 0.92, 0.83 to 1.02; P=0.1). CONCLUSIONS Since 2004, the use of deferred second defibrillation for persistent VT/VF in hospital has doubled. Deferred second defibrillation was not associated with improved survival.
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Affiliation(s)
- Steven M Bradley
- VA Eastern Colorado Health Care System, Denver, CO, USA University of Colorado School of Medicine, Aurora, CO, USA Colorado Cardiovascular Outcomes Research Consortium, Denver, CO, USA
| | - Wenhui Liu
- VA Eastern Colorado Health Care System, Denver, CO, USA University of Colorado School of Public Health, Aurora, CO, USA
| | - Paul S Chan
- Saint Luke's Mid America Heart Institute and University of Missouri-Kansas City, MO, USA
| | | | - Gary K Grunwald
- VA Eastern Colorado Health Care System, Denver, CO, USA University of Colorado School of Public Health, Aurora, CO, USA
| | - Alyssa Self
- University of Colorado School of Medicine, Aurora, CO, USA
| | | | - Paul D Varosy
- VA Eastern Colorado Health Care System, Denver, CO, USA University of Colorado School of Medicine, Aurora, CO, USA Colorado Cardiovascular Outcomes Research Consortium, Denver, CO, USA
| | | | - Preston M Schneider
- University of Colorado School of Medicine, Aurora, CO, USA Colorado Cardiovascular Outcomes Research Consortium, Denver, CO, USA
| | - P Michael Ho
- VA Eastern Colorado Health Care System, Denver, CO, USA University of Colorado School of Medicine, Aurora, CO, USA Colorado Cardiovascular Outcomes Research Consortium, Denver, CO, USA
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21
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Davis D, Aguilar SA, Sell R, Minokadeh A, Husa R. A focused investigation of expedited, stack of three shocks versus chest compressions first followed by single shocks for monitored ventricular fibrillation/ventricular tachycardia cardiopulmonary arrest in an in-hospital setting. J Hosp Med 2016; 11:264-8. [PMID: 26510012 DOI: 10.1002/jhm.2499] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 09/18/2015] [Accepted: 09/27/2015] [Indexed: 11/07/2022]
Abstract
BACKGROUND In cases of in-hospital-witnessed ventricular fibrillation/ventricular tachycardia (VF/VT) arrest, it is unclear whether cardiopulmonary resuscitation prior to defibrillation attempt or expedited stacked defibrillation attempt is superior. METHODS Retrospective, observational study of all admitted patients with continuous cardiac monitoring who suffered VF/VT arrest between July 2005 and June 2013. In the stacked shock period (2005-2008), institutional protocols advocated early defibrillation with administration of 3 stacked shocks with brief pauses between each single defibrillation attempt to confirm sustained VF/VT. During the initial chest compression period (2008-2011), the protocol was modified to perform a 2-minute period of chest compressions prior to each defibrillation, including the initial. In the modified stack shock period (2011-2013), for a monitored arrest, defibrillation attempts were expedited with up to 3 successive shocks administered for persistent VF/VT. In unmonitored arrest, chest compressions and ventilations were initiated prior to defibrillation. The primary outcome measure was survival to hospital discharge. RESULTS Six hundred sixty-one cardiopulmonary arrests were recorded during the study period, with 106 patients (16%) representing primary VF/VT. The incidence of VF/VT arrest did not vary significantly between the study periods (P= 0.16) Survival to hospital discharge for all primary VF/VT arrest victims decreased, then increased significantly from the stacked shock period to initial chest compression period to modified stacked shock period (58%, 18%, 71%, respectively, P < 0.01). Specific group differences were significant between the initial chest compression versus the stacked and modified stacked shock groups (all P < 0.01). CONCLUSION Data suggest that monitored VF/VT should undergo expeditious defibrillation with use of stacked shocks.
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Affiliation(s)
- Daniel Davis
- Department of Emergency Medicine, University of California San Diego, San Diego, California
| | - Steve A Aguilar
- Department of Emergency Medicine, University of California San Diego, San Diego, California
- Department of Emergency Medicine, Kaiser Permanente Medical Center, San Diego, California
| | - Rebecca Sell
- Division of Pulmonary Critical Care, University of California San Diego, San Diego, California
| | - Anush Minokadeh
- Department of Anesthesiology, University of California San Diego, San Diego, California
| | - Ruchika Husa
- Division of Cardiology, University of California San Diego, San Diego, California
- Division of Cardiology, The Ohio State University, Columbus, Ohio
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22
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Faddy SC, Jennings PA. Biphasic versus monophasic waveforms for transthoracic defibrillation in out-of-hospital cardiac arrest. Cochrane Database Syst Rev 2016; 2:CD006762. [PMID: 26904970 PMCID: PMC8454037 DOI: 10.1002/14651858.cd006762.pub2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Transthoracic defibrillation is a potentially life-saving treatment for people with ventricular fibrillation (VF) and haemodynamically unstable ventricular tachycardia (VT). In recent years, biphasic waveforms have become more commonly used for defibrillation than monophasic waveforms. Clinical trials of internal defibrillation and transthoracic defibrillation of short-duration arrhythmias of up to 30 seconds have demonstrated the superiority of biphasic waveforms over monophasic waveforms. However, out-of-hospital cardiac arrest (OHCA) involves a duration of VF/VT of several minutes before defibrillation is attempted. OBJECTIVES To determine the efficacy and safety of biphasic defibrillation waveforms, compared to monophasic, for resuscitation of people experiencing out-of-hospital cardiac arrest. SEARCH METHODS We searched the following electronic databases for potentially relevant studies up to 10 September 2014: the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE and EMBASE. Also we checked the bibliographies of relevant studies and review articles, contacted authors of published reviews and reviewed webpages (including those of device manufacturers) relevant to the review topic. We handsearched the abstracts of conference proceedings for the American Heart Association, American College of Cardiology, European Society of Cardiology, European Resuscitation Council, Society of Critical Care Medicine and European Society of Intensive Care Medicine. Regarding language restrictions, we did not apply any. SELECTION CRITERIA We included randomised controlled trials (RCTs) that compared biphasic and monophasic waveform defibrillation in adults with OHCA. Two review authors independently screened the literature search results. DATA COLLECTION AND ANALYSIS Two review authors independently extracted data from the included trials and performed 'Risk of bias' assessments. We resolved any disagreements by discussion and consensus. The primary outcome was the risk of failure to achieve return of spontaneous circulation (ROSC). Secondary outcomes included risk of failure to revert VF to an organised rhythm following the first shock or up to three shocks, survival to hospital admission and survival to discharge. MAIN RESULTS We included four trials (552 participants) that compared biphasic and monophasic waveform defibrillation in people with OHCA. Based on the assessment of five quality domains, we identified two trials that were at high risk of bias, one trial at unclear risk of bias and one trial at low risk of bias. The risk ratio (RR) for failure to achieve ROSC after biphasic compared to monophasic waveform defibrillation was 0.86 (95% CI 0.62 to 1.20; four trials, 552 participants). The RR for failure to defibrillate on the first shock following biphasic defibrillation compared to monophasic was 0.84 (95% CI 0.70 to 1.01; three trials, 450 participants); and 0.81 (95% CI 0.61 to 1.09; two trials, 317 participants) for one to three stacked shocks. The RR for failure to achieve ROSC after the first shock was 0.92 (95% CI 0.81 to 1.04; two trials, 285 participants). Biphasic waveforms did not reduce the risk of death before hospital admission (RR 1.05, 95% CI 0.90 to 1.23; three trials, 383 participants) or before hospital discharge (RR 1.05, 95% CI 0.78 to 1.42; four trials, 550 participants). There was no statistically significant heterogeneity in any of the pooled analyses. None of the included trials reported adverse events. AUTHORS' CONCLUSIONS It is uncertain whether biphasic defibrillators have an important effect on defibrillation success in people with OHCA. Further large studies are needed to provide adequate statistical power.
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Affiliation(s)
- Steven C Faddy
- Service Development and Planning, Ambulance Service of NSW, Locked Bag 105, Rozelle, NSW, Australia, 2039
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23
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Bragard J, Šimić A, Laroze D, Elorza J. Advantage of four-electrode over two-electrode defibrillators. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 92:062919. [PMID: 26764786 DOI: 10.1103/physreve.92.062919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Indexed: 06/05/2023]
Abstract
Defibrillation is the standard clinical treatment used to stop ventricular fibrillation. An electrical device delivers a controlled amount of electrical energy via a pair of electrodes in order to reestablish a normal heart rate. We propose a technique that is a combination of biphasic shocks applied with a four-electrode system rather than the standard two-electrode system. We use a numerical model of a one-dimensional ring of cardiac tissue in order to test and evaluate the benefit of this technique. We compare three different shock protocols, namely a monophasic and two types of biphasic shocks. The results obtained by using a four-electrode system are compared quantitatively with those obtained with the standard two-electrode system. We find that a huge reduction in defibrillation threshold is achieved with the four-electrode system. For the most efficient protocol (asymmetric biphasic), we obtain a reduction in excess of 80% in the energy required for a defibrillation success rate of 90%. The mechanisms of successful defibrillation are also analyzed. This reveals that the advantage of asymmetric biphasic shocks with four electrodes lies in the duration of the cathodal and anodal phase of the shock.
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Affiliation(s)
- J Bragard
- Physics & Applied Mathematics Department, Navarra University, E-31080 Pamplona, Spain
| | - A Šimić
- Physics & Applied Mathematics Department, Navarra University, E-31080 Pamplona, Spain
| | - D Laroze
- Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica, Chile
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - J Elorza
- Physics & Applied Mathematics Department, Navarra University, E-31080 Pamplona, Spain
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24
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Esibov A, Chapman FW, Melnick SB, Sullivan JL, Walcott GP. Minor Variations in Electrode Pad Placement Impact Defibrillation Success. PREHOSP EMERG CARE 2015; 20:292-8. [PMID: 26383036 DOI: 10.3109/10903127.2015.1076095] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Defibrillation is essential for resuscitating patients with ventricular fibrillation (VF), but shocks often fail to defibrillate. We hypothesized that small variations in pad placement affect shock success, and that defibrillation waveform and shock dose could compensate for suboptimal pad placement. In 10 swine experiments, electrode pads were attached at 3 adjacent anterolateral positions, less than 3 centimeters apart. At each position, 24 episodes of VF were induced and shocked, 8 episodes for each of 3 defibrillation therapies. This resulted in 9 tested combinations of pad position and defibrillation therapy, with 80 episodes of VF for each combination. An episode consisted of 15 seconds of untreated VF, followed by a first shock and, if necessary, a repeat shock. Episodes were separated by four minutes of recovery. Both electrode pad position and therapy order were randomized by experiment. Primary outcome was defined as successful VF termination after the first shock; secondary outcome was the cumulative success of the first and second shocks. First shock efficacy varied widely across the 9 tested combinations of pad position and defibrillation therapy, ranging from 11.3% to 86.3%. When grouped by therapy, first shock efficacy varied significantly between the 3 pad positions: 38.3%, 48.3%, 36.7% (p = 0.02, ANOVA), and, when grouped by pad position, it varied significantly between therapies: 15.0%, 32.5%, 75.8% (p < 0.001, ANOVA). Cumulative 2-shock success varied significantly with therapy (p < 0.001, ANOVA) but not with pad position (p = 0.30, ANOVA). The lowest first shock success was at one position in 6 of 10 animals, at another position in 4 of 10 animals, and never at the third position. Small variations in pad placement can significantly affect defibrillation shock efficacy. However, anatomical variation between individuals and the challenging conditions of real-world resuscitations make optimal pad placement impractical. Suboptimal pad placement can be overcome with defibrillation waveform and shock dose.
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25
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Abstract
Cardiac arrest is a dynamic disease that tests the multitasking and leadership abilities of emergency physicians. Providers must simultaneously manage the logistics of resuscitation while searching for the cause of cardiac arrest. The astute clinician will also realize that he or she is orchestrating only one portion of a larger series of events, each of which directly affects patient outcomes. Resuscitation science is rapidly evolving, and emergency providers must be familiar with the latest evidence and controversies surrounding resuscitative techniques. This article reviews evidence, discusses controversies, and offers strategies to provide quality cardiac arrest resuscitation.
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Affiliation(s)
- Francis X Guyette
- Department of Emergency Medicine, University of Pittsburgh, Suite 10028, Forbes Tower, Pittsburgh, PA 15260, USA
| | - Joshua C Reynolds
- Department of Emergency Medicine, Michigan State University College of Human Medicine, 15 Michigan Street Northeast, Suite 420, Grand Rapids, MI 49503, USA.
| | - Adam Frisch
- Department of Emergency Medicine, Albany Medical Center, 47 New Scotland Avenue, MC 139, Albany, NY 12208, USA
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26
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Wu CJ, Guo ZJ, Li CS, Zhang Y, Yang J. Risk factor analyses for the return of spontaneous circulation in the asphyxiation cardiac arrest porcine model. Chin Med J (Engl) 2015; 128:1096-101. [PMID: 25881606 PMCID: PMC4832952 DOI: 10.4103/0366-6999.155106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Background: Animal models of asphyxiation cardiac arrest (ACA) are frequently used in basic research to mirror the clinical course of cardiac arrest (CA). The rates of the return of spontaneous circulation (ROSC) in ACA animal models are lower than those from studies that have utilized ventricular fibrillation (VF) animal models. The purpose of this study was to characterize the factors associated with the ROSC in the ACA porcine model. Methods: Forty-eight healthy miniature pigs underwent endotracheal tube clamping to induce CA. Once induced, CA was maintained untreated for a period of 8 min. Two minutes following the initiation of cardiopulmonary resuscitation (CPR), defibrillation was attempted until ROSC was achieved or the animal died. To assess the factors associated with ROSC in this CA model, logistic regression analyses were performed to analyze gender, the time of preparation, the amplitude spectrum area (AMSA) from the beginning of CPR and the pH at the beginning of CPR. A receiver-operating characteristic (ROC) curve was used to evaluate the predictive value of AMSA for ROSC. Results: ROSC was only 52.1% successful in this ACA porcine model. The multivariate logistic regression analyses revealed that ROSC significantly depended on the time of preparation, AMSA at the beginning of CPR and pH at the beginning of CPR. The area under the ROC curve in for AMSA at the beginning of CPR was 0.878 successful in predicting ROSC (95% confidence intervals: 0.773∼0.983), and the optimum cut-off value was 15.62 (specificity 95.7% and sensitivity 80.0%). Conclusions: The time of preparation, AMSA and the pH at the beginning of CPR were associated with ROSC in this ACA porcine model. AMSA also predicted the likelihood of ROSC in this ACA animal model.
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Affiliation(s)
| | | | - Chun-Sheng Li
- Department of Emergency, Beijing Chao-Yang Hospital, Capital Medical University, Beijing 100020, China
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27
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[Out-of-hospital emergency medicine in Germany, Austria and Switzerland : randomized prospective studies from 1990 to 2012]. Anaesthesist 2015; 63:54-61. [PMID: 24337071 DOI: 10.1007/s00101-013-2259-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND Only randomized clinical trials can improve the outcome of life-threatening injuries or diseases but observations from England and North America suggest that the number of such randomized clinical trials is decreasing. In this study contributions from German speaking countries with regards to randomized clinical trials in emergency medicine over the last 22 years were investigated. METHODS The Medline database was searched from January 1990 to December 2012 for prospective randomized clinical trials in the prehospital setting using the criteria "cardiac arrest", "cardiopulmonary resuscitation", "multiple trauma", "hemorrhagic shock", "head trauma", "stroke" as well as myocardial infarction and emergency medical service. Only studies originating from Germany, Austria or Switzerland were included. RESULTS A total of 474 studies were found and 25 studies (5.3 %) fulfilled the inclusion criteria. In the last 22 years German speaking countries have published approximately one prospective, randomized, clinical trial per year on prehospital emergency medicine. The median number of patients included in the trials was 159 (minimum 16, maximum 1,219). Most (80 %) studies originated from Germany and most (64 %) studies were conducted by anesthesiology departments. Cardiac arrest was the most frequent subject of the investigated studies. Approximately 50 % of the studies had financial support from industrial companies. CONCLUSION A significant increase or decrease in the number of prospective randomized clinical trials in the out-of-hospital setting could not be found in German speaking countries despite the fact that the absolute numbers of studies had increased. Only about one prospective, randomized clinical trial with an emergency medicine core tracer diagnosis originated from Germany, Austria and Switzerland per year.
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28
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Comparison of electrocardiographic characteristics of adults and children for automated external defibrillator algorithms. Pediatr Emerg Care 2014; 30:851-5. [PMID: 24901950 DOI: 10.1097/pec.0000000000000149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Accurate rhythm identification is vital for appropriate shock delivery during pediatric resuscitation with an automated external defibrillator. Currently, extensive testing of pediatric algorithms is recommended. The aims of our study were to determine age-related differences in electrocardiographic (ECG) tracings in children and adults and to determine if differences warrant evaluating each algorithm against pediatric rhythms. We hypothesized that the ECG characteristics of heart rate, amplitude, and conduction velocity differ between children younger than 8 years and adults. We evaluated 442 separate ECG tracings from 199 pediatric patients and 839 samples from 170 adults to measure differences in the 3 variables. Rhythms chosen were normal sinus rhythm (NSR), supraventricular tachycardia (SVT), and ventricular tachycardia (VT). Significant differences were found between heart rates of children and adults with NSR and SVT but not VT. There were significant differences between adult and pediatric signal amplitudes in both NSR and SVT but no difference in signal amplitude of VT. When NSR between adults and children was compared, adults proved to have a faster conduction velocity. There was no difference in conduction velocity of SVT or VT between children and adults. We conclude that common rhythms in pediatric patients have differing characteristics, which may affect the accuracy of an automated external defibrillator algorithm, and that specific testing with tracings obtained from children is warranted.
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29
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Outcomes following out-of-hospital cardiac arrest with an initial cardiac rhythm of asystole or pulseless electrical activity in Victoria, Australia. Resuscitation 2014; 85:1633-9. [DOI: 10.1016/j.resuscitation.2014.07.015] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 07/14/2014] [Accepted: 07/24/2014] [Indexed: 11/17/2022]
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30
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Bingen BO, Engels MC, Schalij MJ, Jangsangthong W, Neshati Z, Feola I, Ypey DL, Askar SFA, Panfilov AV, Pijnappels DA, de Vries AAF. Light-induced termination of spiral wave arrhythmias by optogenetic engineering of atrial cardiomyocytes. Cardiovasc Res 2014; 104:194-205. [PMID: 25082848 DOI: 10.1093/cvr/cvu179] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
AIMS Atrial fibrillation (AF) is the most common cardiac arrhythmia and often involves reentrant electrical activation (e.g. spiral waves). Drug therapy for AF can have serious side effects including proarrhythmia, while electrical shock therapy is associated with discomfort and tissue damage. Hypothetically, forced expression and subsequent activation of light-gated cation channels in cardiomyocytes might deliver a depolarizing force sufficient for defibrillation, thereby circumventing the aforementioned drawbacks. We therefore investigated the feasibility of light-induced spiral wave termination through cardiac optogenetics. METHODS AND RESULTS Neonatal rat atrial cardiomyocyte monolayers were transduced with lentiviral vectors encoding light-activated Ca(2+)-translocating channelrhodopsin (CatCh; LV.CatCh∼eYFP↑) or eYFP (LV.eYFP↑) as control, and burst-paced to induce spiral waves rotating around functional cores. Effects of CatCh activation on reentry were investigated by optical and multi-electrode array (MEA) mapping. Western blot analyses and immunocytology confirmed transgene expression. Brief blue light pulses (10 ms/470 nm) triggered action potentials only in LV.CatCh∼eYFP↑-transduced cultures, confirming functional CatCh-mediated current. Prolonged light pulses (500 ms) resulted in reentry termination in 100% of LV.CatCh∼eYFP↑-transduced cultures (n = 31) vs. 0% of LV.eYFP↑-transduced cultures (n = 11). Here, CatCh activation caused uniform depolarization, thereby decreasing overall excitability (MEA peak-to-peak amplitude decreased 251.3 ± 217.1 vs. 9.2 ± 9.5 μV in controls). Consequently, functional coresize increased and phase singularities (PSs) drifted, leading to reentry termination by PS-PS or PS-boundary collisions. CONCLUSION This study shows that spiral waves in atrial cardiomyocyte monolayers can be terminated effectively by a light-induced depolarizing current, produced by the arrhythmogenic substrate itself, upon optogenetic engineering. These results provide proof-of-concept for shockless defibrillation.
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Affiliation(s)
- Brian O Bingen
- Laboratory of Experimental Cardiology, Department of Cardiology, Heart Lung Center Leiden, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands
| | - Marc C Engels
- Laboratory of Experimental Cardiology, Department of Cardiology, Heart Lung Center Leiden, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands
| | - Martin J Schalij
- Laboratory of Experimental Cardiology, Department of Cardiology, Heart Lung Center Leiden, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands
| | - Wanchana Jangsangthong
- Laboratory of Experimental Cardiology, Department of Cardiology, Heart Lung Center Leiden, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands
| | - Zeinab Neshati
- Laboratory of Experimental Cardiology, Department of Cardiology, Heart Lung Center Leiden, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands
| | - Iolanda Feola
- Laboratory of Experimental Cardiology, Department of Cardiology, Heart Lung Center Leiden, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands
| | - Dirk L Ypey
- Laboratory of Experimental Cardiology, Department of Cardiology, Heart Lung Center Leiden, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands
| | - Saïd F A Askar
- Laboratory of Experimental Cardiology, Department of Cardiology, Heart Lung Center Leiden, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands
| | | | - Daniël A Pijnappels
- Laboratory of Experimental Cardiology, Department of Cardiology, Heart Lung Center Leiden, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands
| | - Antoine A F de Vries
- Laboratory of Experimental Cardiology, Department of Cardiology, Heart Lung Center Leiden, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands
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Leacock BW. Double Simultaneous Defibrillators for Refractory Ventricular Fibrillation. J Emerg Med 2014; 46:472-4. [DOI: 10.1016/j.jemermed.2013.09.022] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2013] [Revised: 09/16/2013] [Accepted: 09/17/2013] [Indexed: 11/25/2022]
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Bragard J, Simic A, Elorza J, Grigoriev RO, Cherry EM, Gilmour RF, Otani NF, Fenton FH. Shock-induced termination of reentrant cardiac arrhythmias: comparing monophasic and biphasic shock protocols. CHAOS (WOODBURY, N.Y.) 2013; 23:043119. [PMID: 24387558 PMCID: PMC3843767 DOI: 10.1063/1.4829632] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
In this article, we compare quantitatively the efficiency of three different protocols commonly used in commercial defibrillators. These are based on monophasic and both symmetric and asymmetric biphasic shocks. A numerical one-dimensional model of cardiac tissue using the bidomain formulation is used in order to test the different protocols. In particular, we performed a total of 4.8 × 10(6) simulations by varying shock waveform, shock energy, initial conditions, and heterogeneity in internal electrical conductivity. Whenever the shock successfully removed the reentrant dynamics in the tissue, we classified the mechanism. The analysis of the numerical data shows that biphasic shocks are significantly more efficient (by about 25%) than the corresponding monophasic ones. We determine that the increase in efficiency of the biphasic shocks can be explained by the higher proportion of newly excited tissue through the mechanism of direct activation.
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Affiliation(s)
- Jean Bragard
- Department of Physics & Applied Math., University of Navarra, Pamplona, Spain
| | - Ana Simic
- Department of Physics & Applied Math., University of Navarra, Pamplona, Spain
| | - Jorge Elorza
- Department of Physics & Applied Math., University of Navarra, Pamplona, Spain
| | - Roman O Grigoriev
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - Elizabeth M Cherry
- School of Mathematical Sciences, Rochester Institute of Technology, Rochester, New York 14623, USA
| | - Robert F Gilmour
- University of Prince Edward Island, Charlottetown C1A 4P3, Canada
| | - Niels F Otani
- School of Mathematical Sciences, Rochester Institute of Technology, Rochester, New York 14623, USA
| | - Flavio H Fenton
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
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Goldberg SA, Leatham A, Pepe PE. Year in review 2012: Critical Care--Out-of-hospital cardiac arrest and trauma. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2013; 17:248. [PMID: 24267483 PMCID: PMC4059384 DOI: 10.1186/cc13128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
In 2012 Critical Care published many articles pertaining to the resuscitation of out-of-hospital cardiac arrest and trauma. In this review, we summarize several of these articles, including those regarding advances in resuscitation techniques and methods. We examine articles pertaining to prehospital endotracheal intubation, the use of specialized devices for cardiopulmonary resuscitation and policies regarding transport destinations for both cardiac arrest and trauma patients. Articles on the predictors of outcome in both pediatric and adult populations are evaluated, including articles on the effects of obesity on survival from hemorrhage and pediatric outcomes from traumatic cardiac arrest. The effects of the type and volume of resuscitation fluids for both adult and pediatric patients are discussed, as are the factors contributing to hypothermia in trauma patients.
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Morrison LJ, Henry RM, Ku V, Nolan JP, Morley P, Deakin CD. Single-shock defibrillation success in adult cardiac arrest: A systematic review. Resuscitation 2013; 84:1480-6. [DOI: 10.1016/j.resuscitation.2013.07.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Revised: 07/03/2013] [Accepted: 07/04/2013] [Indexed: 12/22/2022]
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Biphasic versus monophasic defibrillation in out-of-hospital cardiac arrest: a systematic review and meta-analysis. Am J Emerg Med 2013; 31:1472-8. [PMID: 24035505 DOI: 10.1016/j.ajem.2013.07.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2013] [Revised: 06/09/2013] [Accepted: 07/18/2013] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE Biphasic defibrillation is more effective than monophasic one in controlled in-hospital conditions. The present review evaluated the performance of both waveforms in the defibrillation of patients of out-of-hospital cardiac arrest (OHCA) with initial ventricular fibrillation (Vf) rhythm under the context of current recommendations for cardiopulmonary resuscitation. METHODS From inception to June 2012, Medline, Embase, and the Cochrane Central Register of Controlled Trials were searched systemically for randomized controlled trials (RCTs) and observational cohort studies that compared the effects of biphasic and monophasic shocks on Vf termination, return of spontaneous circulation (ROSC), and survival to hospital discharge in OHCA patients with initial Vf rhythm. No restrictions were applied regarding language, population, or publication year. RESULTS Four RCTs including 572 patients were identified from 131 potentially relevant references for meta-analysis. The synthesis of these RCTs yielded fixed-effect pooled risk ratios (RRs) for biphasic and monophasic waveforms on Vf termination survival to hospital discharge (RR, 1.14; 95% CI, [0.84-1.54]). CONCLUSION Biphasic waveforms did not seem superior to monophasic ones with respect to Vf termination, ROSC, or survival to hospital discharge in OHCA patients with initial Vf rhythm under the context of current guidelines. However, most trials were conducted in accordance with previous guidelines for cardiopulmonary resuscitation. Therefore, further trials are needed to clarify this issue.
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Maton BL, Smarick SD. Updates in the American Heart Association guidelines for cardiopulmonary resuscitation and potential applications to veterinary patients. J Vet Emerg Crit Care (San Antonio) 2013; 22:148-59. [PMID: 23016807 DOI: 10.1111/j.1476-4431.2012.00720.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To review the updates in the American Heart Association (AHA) guidelines for cardiopulmonary resuscitation (CPR) and identify potential applications to veterinary patients. ETIOLOGY Cardiopulmonary arrest is common in veterinary emergency and critical care, and consensus guidelines are lacking. Human resuscitation guidelines are continually evolving as new clinical and experimental studies support updated recommendations. Synthesis of human, experimental animal model, and veterinary literature support the potential for updates and advancement in veterinary CPR practices. THERAPY This review serves to highlight updates in the AHA guidelines for CPR and evaluate their application to small animal veterinary patients. Interventions identified will be evaluated for trans-species potential, raise questions regarding best resuscitation recommendations, and offer opportunities for further research to continue to advance veterinary CPR. PROGNOSIS The prognosis for any patient undergoing cardiopulmonary arrest remains guarded.
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L'italien AJ. Critical cardiovascular skills and procedures in the emergency department. Emerg Med Clin North Am 2013. [PMID: 23200332 DOI: 10.1016/j.emc.2012.09.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The management of cardiovascular emergencies is a fundamental component of the practice of an emergency practitioner. Delays in the evaluations and management can lead to significant morbidity or mortality. It is of vital importance to be familiar with procedures such as pericardiocentesis, cardioversion, defibrillation, temporary pacing, and options for the management of tachyarrhythmias. This article discusses the most common cardiovascular procedures encountered in an emergency setting, including the indications, contraindications, equipment, technique, and complications for each procedure.
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Affiliation(s)
- Anita J L'italien
- Department of Emergency Medicine, Wake Emergency Physicians, PA, 3000 New Bern Avenue, Medical Office Building, Raleigh, NC 27610, USA. l'
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Darragh K, Manoharan G, Di Maio R, Stevenson M, Bennett J, Walsh S, Allen J, Anderson J, Adgey A. A low tilt waveform in the transthoracic defibrillation of ventricular arrhythmias during cardiac arrest. Resuscitation 2012; 83:1438-43. [DOI: 10.1016/j.resuscitation.2012.04.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2011] [Revised: 04/22/2012] [Accepted: 04/29/2012] [Indexed: 10/28/2022]
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Tanabe S, Yasunaga H, Koike S, Akahane M, Ogawa T, Horiguchi H, Hatanaka T, Yokota H, Imamura T. Monophasic versus biphasic defibrillation for pediatric out-of-hospital cardiac arrest patients: a nationwide population-based study in Japan. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2012; 16:R219. [PMID: 23148767 PMCID: PMC3672598 DOI: 10.1186/cc11864] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Accepted: 11/09/2012] [Indexed: 01/11/2023]
Abstract
Introduction Conventional monophasic defibrillators for out-of-hospital cardiac-arrest patients have been replaced with biphasic defibrillators. However, the advantage of biphasic over monophasic defibrillation for pediatric out-of-hospital cardiac-arrest patients remains unknown. This study aimed to compare the survival outcomes of pediatric out-of-hospital cardiac-arrest patients who underwent monophasic defibrillation with those who underwent biphasic defibrillation. Methods This prospective, nationwide, population-based observational study included pediatric out-of-hospital cardiac-arrest patients from January 1, 2005, to December 31, 2009. The primary outcome measure was survival at 1 month with minimal neurologic impairment. The secondary outcome measures were survival at 1 month and the return of spontaneous circulation before hospital arrival. Multivariable logistic regression analysis was performed to identify the independent association between defibrillator type (monophasic or biphasic) and outcomes. Results Among 5,628 pediatric out-of-hospital cardiac-arrest patients (1 through 17 years old), 430 who received defibrillation shock with monophasic or biphasic defibrillator were analyzed. The number of patients who received defibrillation shock with monophasic defibrillator was 127 (30%), and 303 (70%) received defibrillation shock with biphasic defibrillator. The survival rates at 1 month with minimal neurologic impairment were 17.5% and 24.4%, the survival rates at 1 month were 32.3% and 35.6%, and the rates of return of spontaneous circulation before hospital arrival were 24.4% and 27.4% in the monophasic and biphasic defibrillator groups, respectively. Hierarchic logistic regression analyses by using generalized estimation equations found no significant difference between the two groups in terms of 1-month survival with minimal neurologic impairment (odds ratio (OR), 1.57; 95% confidence interval (CI), 0.87 to 2.83; P = 0.14) and 1-month survival (OR, 1.38; 95% CI, 0.87 to 2.18; P = 0.17). Conclusions The present nationwide population-based observational study could not confirm an advantage of biphasic over monophasic defibrillators for pediatric OHCA patients.
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Defibrillation threshold varies during different stages of ventricular fibrillation in canine hearts. Heart Lung Circ 2012; 22:133-40. [PMID: 23021977 DOI: 10.1016/j.hlc.2012.08.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 08/09/2012] [Accepted: 08/29/2012] [Indexed: 11/23/2022]
Abstract
BACKGROUND Recent studies have shown that short duration ventricular fibrillation (SDVF) and long duration ventricular fibrillation (LDVF) are maintained by different mechanisms. The objective of this study is to evaluate how the defibrillation threshold (DFT) varies over the duration of fibrillation since the mechanism of VF maintenance changes as VF progresses. METHODS Twelve canines were randomly divided into two groups (Group A and B, n=6 each). DFTs were measured three times in each group: SDVF (20s), LDVF (3min in Group A and 7min in Group B) and the first episode of refibrillation after successful defibrillation for LDVF. Two 64-electrode baskets used to globally map the endocardium were deployed into the left ventricle and right ventricle, respectively. RESULTS LDVF-DFT in Group A was significantly higher than that of Group B (628±98V vs 313±81V, P<0.001). In Group B, the DFT of refibrillation was significantly increased compared with the LDVF-DFT (570±199V vs 313±81V, P=0.035) but did not differ from the DFT of refibrillation in Group A (570±199V vs 638±116V, P=0.39). Highly synchronised activation patterns on the left ventricular endocardium were observed between 3 and 7min of LDVF in Group B but not within 3min-LDVF in Group A or during refibrillation in each group. CONCLUSIONS DFT varied during different stages of VF. The highly synchronised activation patterns exhibiting after 3min VF might contribute to the decreased LDVF-DFT.
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Postshock rhythm after first defibrillation of out-of-hospital cardiac arrest patients in ventricular fibrillation: An early outcome predictor. Resuscitation 2012. [DOI: 10.1016/j.resuscitation.2012.08.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Ristagno G, Yu T, Quan W, Freeman G, Li Y. Current is better than energy as predictor of success for biphasic defibrillatory shocks in a porcine model of ventricular fibrillation. Resuscitation 2012; 84:678-83. [PMID: 23032689 DOI: 10.1016/j.resuscitation.2012.09.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Revised: 09/13/2012] [Accepted: 09/24/2012] [Indexed: 11/29/2022]
Abstract
OBJECTIVE The evidence that monophasic defibrillation success is mainly determined by current is secure. However, modern defibrillators use biphasic waveforms. The aim of this study was to compare energy, peak voltage and peak current in predicting biphasic shock success in a porcine model of ventricular fibrillation (VF) where the impedance varies within a wide of ranges. METHODS In 14 domestic male pigs weighing between 27 and 38 kg, VF was electrically induced and untreated for 15 s. Animals were randomized to receive defibrillation attempts from one of two defibrillators with different impedance compensation methods. A grouped up-and-down defibrillation threshold testing protocol was used to maintain the average success rate in the neighborhood of 50%. After a recovery interval of 5 min, the testing sequence was repeated for a total of 60 test shocks for each animal. RESULTS A high defibrillation success was observed when high peak current was delivered. The area under ROC curve for predicting shock success was 0.681 for peak current, 0.585 for peak voltage and 0.562 for energy. The odds ratio revealed that peak current was a better predictor (OR=1.321, p<0.001) for defibrillation outcome compared with energy (OR=0.979, p<0.001) and peak voltage (OR=1.000, p=0.69) when multivariable logistic regression was conducted. CONCLUSION In this porcine model of VF within a wide range of transthoracic impedance, peak current was a better indicator for shock success than the currently used energy for biphasic defibrillatory shocks. This finding may encourage design of new current-based biphasic defibrillators.
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The effect of the AED and AED programs on survival of individuals, groups and populations. Prehosp Disaster Med 2012; 27:419-24. [PMID: 22985768 DOI: 10.1017/s1049023x12001197] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE The automated external defibrillator (AED) is a tool that contributes to survival with mixed outcomes. This review assesses the effectiveness of the AED, consistencies and variations among studies, and how varying outcomes can be resolved. METHODS A worksheet for the International Liaison Committee on Resuscitation (ILCOR) 2010 science review focused on hospital survival in AED programs was the foundation of the articles reviewed. Articles identified in the search covering a broader range of topics were added. All articles were read by at least two authors; consensus discussions resolved differences. RESULTS AED use developed sequentially. Use of AEDs by emergency medical technicians (EMTs) compared to manual defibrillators showed equal or superior survival. AED use was extended to trained responders likely to be near victims, such as fire/rescue, police, airline attendants, and casino security guards, with improvement in all venues but not all programs. Broad public access initiatives demonstrated increased survival despite low rates of AED use. Home AED programs have not improved survival; in-hospital trials have had mixed results. Successful programs have placed devices in high-risk sites, maintained the AEDs, recruited a team with a duty to respond, and conducted ongoing assessment of the program. CONCLUSION The AED can affect survival among patients with sudden ventricular fibrillation (VF). Components of AED programs that affect outcome include the operator, location, the emergency response system, ongoing maintenance and evaluation. Comparing outcomes is complicated by variations in definitions of populations and variables. The effect of AEDs on individuals can be dramatic, but the effect on populations is limited.
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Comparison of shock-first strategy and cardiopulmonary resuscitation-first strategy in a porcine model of prolonged cardiac arrest. Resuscitation 2012; 84:233-8. [PMID: 22771871 DOI: 10.1016/j.resuscitation.2012.06.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2012] [Accepted: 06/29/2012] [Indexed: 11/21/2022]
Abstract
OBJECTIVE The choice of a shock-first or a cardiopulmonary resuscitation (CPR)-first strategy in the treatment of prolonged cardiac arrest (CA) is still controversial. The purpose of this study was to compare the effects of these strategies on oxygen metabolism and resuscitation outcomes in a porcine model of 8min CA. METHODS Ventricular fibrillation (VF) was electrically induced. After 8min of untreated VF, 24 male inbred Wu-Zhi-Shan miniature pigs were randomized to receive either defibrillation first (ID group) or chest compression first (IC group). In the ID group, a shock was delivered immediately. If the defibrillation attempt failed to attain restoration of spontaneous circulation (ROSC), manual chest compressions were rapidly initiated at a rate of 100compressionsmin(-1), and the compression-to-ventilation ratio was 30:2. If VF persisted after five cycles of CPR, a second defibrillation attempt was made. In the IC group, chest compressions were delivered first, followed by a shock. RESULTS Hemodynamic variables, the VF waveform and blood gas analysis outcomes were recorded. Oxygen metabolism parameters and the amplitude spectrum area (AMSA) of the VF waveform were computed. There were no significant differences in the rate of ROSC and 24h survival between two groups. The ID group had lower lactic acid levels, higher cardiac output, better oxygen consumption and better oxygen extraction ratio at 4 and 6h after ROSC than the IC group. CONCLUSIONS In a porcine model of prolonged CA, the choice of a shock-first or CPR-first strategy did not affect the rate of ROSC and 24h survival, but the shock-first strategy might result in better hemodynamic status and better oxygen metabolism than the CPR-first strategy at the first 6h after ROSC.
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Rozanski EA, Rush JE, Buckley GJ, Fletcher DJ, Boller M. RECOVER evidence and knowledge gap analysis on veterinary CPR. Part 4: Advanced life support. J Vet Emerg Crit Care (San Antonio) 2012; 22 Suppl 1:S44-64. [DOI: 10.1111/j.1476-4431.2012.00755.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - John E. Rush
- Cummings School of Veterinary Medicine; Tufts University; North Grafton; MA
| | - Gareth J. Buckley
- College of Veterinary Medicine, University of Florida; Gainesville; FL
| | - Daniel J. Fletcher
- College of Veterinary Medicine, Department of Clinical Sciences; Cornell University; Ithaca; NY
| | - Manuel Boller
- Department of Clinical Studies, School of Veterinary Medicine and the Department of Emergency Medicine, School of Medicine; Center for Resuscitation Science University of Pennsylvania; Philadelphia; PA
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Taylor TG, Venable PW, Shibayama J, Warren M, Zaitsev AV. Role of KATP channel in electrical depression and asystole during long-duration ventricular fibrillation in ex vivo canine heart. Am J Physiol Heart Circ Physiol 2012; 302:H2396-409. [PMID: 22467302 PMCID: PMC3378304 DOI: 10.1152/ajpheart.00752.2011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Accepted: 03/22/2012] [Indexed: 11/22/2022]
Abstract
Long-duration ventricular fibrillation (LDVF) in the globally ischemic heart is characterized by transmurally heterogeneous decline in ventricular fibrillation rate (VFR), emergence of inexcitable regions, and eventual global asystole. Rapid loss of both local and global excitability is detrimental to successful defibrillation and resuscitation during cardiac arrest. We sought to assess the role of the ATP-sensitive potassium current (I(KATP)) in the timing and spatial pattern of electrical depression during LDVF in a structurally normal canine heart. We analyzed endo-, mid-, and epicardial unipolar electrograms and epicardial optical recordings in the left ventricle of isolated canine hearts during 10 min of LDVF in the absence (control) and presence of an I(KATP) blocker glybenclamide (60 μM). In all myocardial layers, average VFR was the same or higher in glybenclamide-treated than in control hearts. The difference increased with time of LDVF and was overall significant in all layers (P < 0.05). However, glybenclamide did not significantly affect the transmural VFR gradient. In epicardial optical recordings, glybenclamide shortened diastolic intervals, prolonged action potential duration, and decreased the percentage of inexcitable area (all differences P < 0.001). During 10 min of LDVF, asystole occurred in 55.6% of control and none of glybenclamide-treated hearts (P < 0.05). In three hearts paced after the onset of asystole, there was no response to LV epicardial or atrial pacing. In structurally normal canine hearts, I(KATP) opening during LDVF is a major factor in the onset of local and global inexcitability, whereas it has a limited role in overall deceleration of VFR and the transmural VFR gradient.
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Affiliation(s)
- Tyson G Taylor
- Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, 84112-5000, USA
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Abstract
Recognition and appropriate treatment of ventricular fibrillation or pulseless ventricular tachycardia is an essential skill for healthcare providers. Appropriate defibrillation can improve survival and benefit patient outcome. Similarly, increased public access to automatic electronic defibrillators has been shown to improve out-of-hospital survival for cardiac arrest. When combined with high-quality cardiopulmonary resuscitation, electrical therapies are an important aspect of resuscitation in the patient with cardiac arrest. This article focuses on the use of electrical therapies, including defibrillation, cardiac pacing, and automated external defibrillators, in cardiac arrest.
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Haskell SE, Atkins DL. Defibrillation in children. J Emerg Trauma Shock 2011; 3:261-6. [PMID: 20930970 PMCID: PMC2938491 DOI: 10.4103/0974-2700.66526] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2009] [Accepted: 04/24/2010] [Indexed: 12/04/2022] Open
Abstract
Defibrillation is the only effective treatment for ventricular fibrillation (VF). Optimal methods for defibrillation in children are derived and extrapolated from adult data. VF occurs as the initial rhythm in 8-20% of pediatric cardiac arrests. This has fostered a new interest in determining the optimal technique for pediatric defibrillation. This review will provide a brief background of the history of defibrillation and a review of the current literature on pediatric defibrillation. The literature search was performed through PubMed, using the MeSH headings of cardiopulmonary resuscitation, defibrillation and electric countershock. The authors’ personal bibliographic files were also searched. Only published articles were chosen. The recommended energy dose has been 2 J/kg for 30 years, but recent reports may indicate that higher dosages may be more effective and safe. In 2005, the European Resuscitation Council recommended 4 J/kg as the initial dose, without escalation for subsequent shocks. Automated external defibrillators are increasingly used for pediatric cardiac arrest, and available reports indicate high success rates. Additional research on pediatric defibrillation is critical in order to be able to provide an equivalent standard of care for children in cardiac arrest and improve outcomes.
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Affiliation(s)
- Sarah E Haskell
- Department of Pediatrics, University of Iowa Children's Hospital, University of Iowa Carver College of Medicine, 200 Hawks Drive, Iowa City, IA 52242, USA
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Biarent D, Bingham R, Eich C, López-Herce J, Maconochie I, Rodríguez-Núñez A, Rajka T, Zideman D. European Resuscitation Council Guidelines for Resuscitation 2010 Section 6. Paediatric life support. Resuscitation 2011; 81:1364-88. [PMID: 20956047 DOI: 10.1016/j.resuscitation.2010.08.012] [Citation(s) in RCA: 151] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Dominique Biarent
- Paediatric Intensive Care, Hôpital Universitaire des Enfants, 15 av JJ Crocq, Brussels, Belgium.
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Wenzel V, Russo SG, Arntz HR, Bahr J, Baubin MA, Böttiger BW, Dirks B, Kreimeier U, Fries M, Eich C. [Comments on the 2010 guidelines on cardiopulmonary resuscitation of the European Resuscitation Council]. Anaesthesist 2011; 59:1105-23. [PMID: 21125214 DOI: 10.1007/s00101-010-1820-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
ADULTS Administer chest compressions (minimum 100/min, minimum 5 cm depth) at a ratio of 30:2 with ventilation (tidal volume 500-600 ml, inspiration time 1 s, F(I)O₂ if possible 1.0). Avoid any interruptions in chest compressions. After every single defibrillation attempt (initially biphasic 120-200 J, monophasic 360 J, subsequently with the respective highest energy), chest compressions are initiated again immediately for 2 min independent of the ECG rhythm. Tracheal intubation is the optimal method for securing the airway during resuscitation but should be performed only by experienced airway management providers. Laryngoscopy is performed during ongoing chest compressions; interruption of chest compressions for a maximum of 10 s to pass the tube through the vocal cords. Supraglottic airway devices are alternatives to tracheal intubation. Drug administration routes for adults and children: first choice i.v., second choice intraosseous (i.o.). Vasopressors: 1 mg epinephrine every 3-5 min i.v. After the third unsuccessful defibrillation amiodarone (300 mg i.v.), repetition (150 mg) possible. Sodium bicarbonate (50 ml 8.4%) only for excessive hyperkaliemia, metabolic acidosis, or intoxication with tricyclic antidepressants. Consider aminophylline (5 mg/kgBW). Thrombolysis during spontaneous circulation only for myocardial infarction or massive pulmonary embolism; during on-going cardiopulmonary resuscitation (CPR) only when indications of massive pulmonary embolism. Active compression-decompression (ACD-CPR) and inspiratory threshold valve (ITV-CPR) are not superior to good standard CPR. CHILDREN Most effective improvement of outcome by prevention of full cardiorespiratory arrest. Basic life support: initially five rescue breaths, followed by chest compressions (100-120/min depth about one third of chest diameter), compression-ventilation ratio 15:2. Foreign body airway obstruction with insufficient cough: alternate back blows and chest compressions (infants), or abdominal compressions (children >1 year). Treatment of potentially reversible causes: ("4 Hs and 4 Ts") hypoxia and hypovolaemia, hypokalaemia and hyperkalaemia, hypothermia, and tension pneumothorax, tamponade, toxic/therapeutic disturbances, thrombosis (coronary/pulmonary). Advanced life support: adrenaline (epinephrine) 10 µg/kgBW i.v. or i.o. every 3-5 min. Defibrillation (4 J/kgBW; monophasic or biphasic) followed by 2 min CPR, then ECG and pulse check. NEWBORNS: Initially inflate the lungs with bag-valve mask ventilation (p(AW) 20-40 cmH₂O). If heart rate remains <60/min, start chest compressions (120 chest compressions/min) and ventilation with a ratio 3:1. Maintain normothermia in preterm babies by covering them with foodgrade plastic wrap or similar. POSTRESUSCITATION PHASE: Early protocol-based intensive care stabilization; initiate mild hypothermia early regardless of initial cardiac rhythm [32-34°C for 12-24 h (adults) or 24 h (children); slow rewarming (<0.5°C/h)]. Consider percutaneous coronary intervention (PCI) in patients with presumed cardiac ischemia. Prediction of CPR outcome is not possible at the scene, determine neurological outcome <72 h after cardiac arrest with somatosensory evoked potentials, biochemical tests and neurological examination. ACUTE CORONARY SYNDROME: Even if only a weak suspicion of an acute coronary syndrome is present, record a prehospital 12-lead ECG. In parallel to pain therapy, administer aspirin (160-325 mg p.o. or i.v.) and clopidogrel (75-600 mg depending on strategy); in ST-elevation myocardial infarction (STEMI) and planned PCI also prasugrel (60 mg p.o.). Antithrombins, such as heparin (60 IU/kgBW, max. 4000 IU), enoxaparin, bivalirudin or fondaparinux depending on the diagnosis (STEMI or non-STEMI-ACS) and the planned therapeutic strategy. In STEMI define reperfusion strategy depending on duration of symptoms until PCI, age and location of infarction. TRAUMA: In severe hemorrhagic shock, definitive control of bleeding is the most important goal. For successful CPR of trauma patients a minimal intravascular volume status and management of hypoxia are essential. Aggressive fluid resuscitation, hyperventilation and excessive ventilation pressure may impair outcome in patients with severe hemorrhagic shock. TRAINING Any CPR training is better than nothing; simplification of contents and processes is the main aim.
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Affiliation(s)
- V Wenzel
- Univ.-Klinik für Anaesthesie und Intensivmedizin, Medizinische Universität Innsbruck, Anichstr. 35, 6020, Innsbruck, Österreich.
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