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Prause G, Zoidl P, Eichinger M, Eichlseder M, Orlob S, Ruhdorfer F, Honnef G, Metnitz PGH, Zajic P. Mechanical ventilation with ten versus twenty breaths per minute during cardio-pulmonary resuscitation for out-of-hospital cardiac arrest: A randomised controlled trial. Resuscitation 2023; 187:109765. [PMID: 36931453 DOI: 10.1016/j.resuscitation.2023.109765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Revised: 03/03/2023] [Accepted: 03/04/2023] [Indexed: 03/17/2023]
Abstract
AIM OF THE STUDY This study sought to assess the effects of increasing the ventilatory rate from 10 min-1 to 20 min-1 using a mechanical ventilator during cardio-pulmonary resuscitation (CPR) for out-of-hospital cardiac arrest (OHCA) on ventilation, acid-base-status, and outcomes. METHODS This was a randomised, controlled, single-centre trial in adult patients receiving CPR including advanced airway management and mechanical ventilation offered by staff of a prehospital physician response unit (PRU). Ventilation was conducted using a turbine-driven ventilator (volume-controlled ventilation, tidal volume 6 ml per kg of ideal body weight, positive end-expiratory pressure (PEEP) 0 mmHg, inspiratory oxygen fraction (FiO2) 100%), frequency was pre-set at either 10 or 20 breaths per minute according to week of randomisation. If possible, an arterial line was placed and blood gas analysis was performed. RESULTS The study was terminated early due to slow recruitment. 46 patients (23 per group) were included. Patients in the 20 min-1 group received higher expiratory minute volumes [8.8 (6.8-9.9) vs. 4.9 (4.2-5.7) litres, p < 0.001] without higher mean airway pressures [11.6 (9.8-13.6) vs. 9.8 (8.5-12.0) mmHg, p = 0.496] or peak airway pressures [42.5 (36.5-45.9) vs. 41.4 (32.2-51.7) mmHg, p = 0.895]. Rates of ROSC [12 of 23 (52%) vs. 11 of 23 (48%), p = 0.768], median pH [6.83 (6.65-7.05) vs. 6.89 (6.80-6.97), p = 0.913], and median pCO2 [78 (51-105) vs. 86 (73-107) mmHg, p > 0.999] did not differ between groups. CONCLUSION 20 instead of 10 mechanical ventilations during CPR increase ventilation volumes per minute, but do not improve CO2 washout, acidaemia, oxygenation, or rate of ROSC. CLINICALTRIALS gov Identifier: NCT04657393.
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Affiliation(s)
- Gerhard Prause
- Division of General Anaesthesiology, Emergency- and Intensive Care Medicine, Medical University of Graz, Graz, Austria
| | - Philipp Zoidl
- Division of General Anaesthesiology, Emergency- and Intensive Care Medicine, Medical University of Graz, Graz, Austria
| | - Michael Eichinger
- Division of General Anaesthesiology, Emergency- and Intensive Care Medicine, Medical University of Graz, Graz, Austria
| | - Michael Eichlseder
- Division of General Anaesthesiology, Emergency- and Intensive Care Medicine, Medical University of Graz, Graz, Austria
| | - Simon Orlob
- Division of Anaesthesiology for Cardiovascular Surgery and Intensive Care Medicine, Medical University of Graz, Graz, Austria
| | - Felix Ruhdorfer
- Division of General Anaesthesiology, Emergency- and Intensive Care Medicine, Medical University of Graz, Graz, Austria
| | - Gabriel Honnef
- Division of General Anaesthesiology, Emergency- and Intensive Care Medicine, Medical University of Graz, Graz, Austria
| | - Philipp G H Metnitz
- Division of General Anaesthesiology, Emergency- and Intensive Care Medicine, Medical University of Graz, Graz, Austria. https://twitter.com/PhZoidl
| | - Paul Zajic
- Division of General Anaesthesiology, Emergency- and Intensive Care Medicine, Medical University of Graz, Graz, Austria
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Tang Y, Sun M, Zhu A. Outcome of cardiopulmonary resuscitation with different ventilation modes in adults: A meta-analysis. Am J Emerg Med 2022; 57:60-69. [DOI: 10.1016/j.ajem.2022.04.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 04/17/2022] [Accepted: 04/20/2022] [Indexed: 10/18/2022] Open
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Aggelina A, Pantazopoulos I, Giokas G, Chalkias A, Mavrovounis G, Papalois A, Douvanas A, Xanthos T, Iacovidou N. Continuous chest compressions with asynchronous ventilation improve survival in a neonatal swine model of asphyxial cardiac arrest. Am J Emerg Med 2021; 48:60-66. [PMID: 33839633 DOI: 10.1016/j.ajem.2021.04.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 03/27/2021] [Accepted: 04/03/2021] [Indexed: 10/21/2022] Open
Abstract
BACKGROUND Guidelines for neonatal resuscitation recommend a 3:1 compression to ventilation ratio. However, this recommendation is based on expert opinion and consensus rather than strong scientific evidence. Our primary aim was to assess whether continuous chest compressions with asynchronous ventilations would increase return of spontaneous circulation (ROSC) rate and survival compared to the 3:1 chest compression to ventilation ratio. METHODS This was a prospective, randomized, laboratory study. Twenty male Landrace-Large White pigs, aged 1-4 days with an average weight 1.650 ± 228.3 g were asphyxiated and left untreated until heart rate was less than 60 bpm or mean arterial pressure was below 15 mmHg. Animals were then randomly assigned to receive either continuous chest compressions with asynchronous ventilations (n = 10), or standard (3:1) chest compression to ventilation ratio (n = 10). Heart rate and arterial pressure were assessed every 30 s during cardiopulmonary resuscitation (CPR) until ROSC or asystole. All animals with ROSC were monitored for 4 h. RESULTS Coronary perfusion pressure (CPP) at 30 s of CPR was significantly higher in the experimental group (45.7 ± 16.9 vs. 21.8 ± 6 mmHg, p < 0.001) and remained significantly elevated throughout the experiment. End-tidal carbon dioxide (ETCO2) was also significantly higher in the experimental group throughout the experiment (23.4 ± 5.6 vs. 14.7 ± 5.9 mmHg, p < 0.001). ROSC was observed in six (60%) animals treated with 3:1 compression to ventilation ratio and nine (90%) animals treated with continuous chest compressions and asynchronous ventilation (p = 0.30). Time to ROSC was significantly lower in the experimental group (30 (30-30) vs. 60 (60-60) sec, p = 0.021). Of note, 7 (77.8%) animals in the experimental group and 1 (16.7%) animal in the control group achieved ROSC after 30 s (0.02). At 4 h, 2 (20%) animals survived in the control group compared to 7 (70%) animals in the experimental group (p = 0.022). CONCLUSION Continuous chest compressions with asynchronous ventilations significantly improved CPP, ETCO2, time to ROSC, ROSC at 30 s and survival in a porcine model of neonatal resuscitation.
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Affiliation(s)
- Afrodite Aggelina
- National & Kapodistrian University of Athens, School of Medicine, 11527, Greece
| | - Ioannis Pantazopoulos
- University of Thessaly, School of Health Sciences, Faculty of Medicine, Department of Emergency Medicine, 41110 Larissa, Greece
| | - George Giokas
- National & Kapodistrian University of Athens, School of Medicine, 11527, Greece
| | - Athanasios Chalkias
- University of Thessaly, School of Health Sciences, Faculty of Medicine, Department of Anesthesiology, 41110 Larissa, Greece
| | - Georgios Mavrovounis
- University of Thessaly, School of Health Sciences, Faculty of Medicine, Department of Emergency Medicine, 41110 Larissa, Greece.
| | - Apostolos Papalois
- Experimental, Educational and Research Center ELPEN, Greece; European University Cyprus, School of Medicine, 1516, Cyprus.
| | - Alexandros Douvanas
- National & Kapodistrian University of Athens, School of Medicine, 11527, Greece
| | | | - Nicoletta Iacovidou
- National and Kapodistrian University of Athens, Medical School, 11527, Greece; Department of Neonatology, Aretaieio Hospital, 11528, Greece
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Benoit JL, Stolz U, McMullan JT, Wang HE. Duration of exposure to a prehospital advanced airway and neurological outcome for out-of-hospital cardiac arrest: A retrospective cohort study. Resuscitation 2021; 160:59-65. [PMID: 33482266 DOI: 10.1016/j.resuscitation.2021.01.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 12/23/2020] [Accepted: 01/07/2021] [Indexed: 01/17/2023]
Abstract
BACKGROUND Out-of-hospital cardiac arrest (OHCA) studies have focused on the benefits and harms of placing an intra-arrest advanced airway, but few studies have evaluated the benefits and harms after successful placement. We hypothesize that increased time in the tumultuous prehospital environment after intra-arrest advanced airway placement results in reduced patient survival. METHODS This was a secondary analysis of adult, non-traumatic, OHCA patients with an advanced airway placed in the PRIMED trial. The exposure variable was the time interval between successful advanced airway placement and Emergency Department (ED) arrival. The outcome was cerebral performance category (CPC) 1 or 2 at hospital discharge. Multivariable logistic regression, adjusted for Utstein variables and resuscitation-associated time intervals, was used to estimate adjusted odds ratios (aOR). RESULTS The cohort of complete cases included 4779 patients. The median time exposed to a prehospital advanced airway was 27 min (IQR 20-35). The total prehospital time was 39.4 min (IQR 32.3-48.1). An advanced airway was placed intra-arrest in 3830 cases (80.1%) and post-return of spontaneous circulation (post-ROSC) in 949 cases (19.9%). Overall, 486 (10.2%) of the cohort achieved the CPC outcome, but this was higher in the post-ROSC (21.7%) versus intra-arrest (7.5%) cohort. CPC was not associated with the time interval from advanced airway placement to ED arrival in the intra-arrest airway cohort (aOR 0.98, 95%CI 0.94-1.01). CONCLUSIONS In OHCA patients who receive an intra-arrest advanced airway, longer time intervals exposed to a prehospital advanced airway are not associated with reduced patient survival.
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Affiliation(s)
- Justin L Benoit
- Department of Emergency Medicine, University of Cincinnati College of Medicine, Cincinnati, OH, USA.
| | - Uwe Stolz
- Department of Emergency Medicine, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Jason T McMullan
- Department of Emergency Medicine, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Henry E Wang
- Department of Emergency Medicine, University of Texas Health Science Center at Houston, Houston, TX, USA
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van Schuppen H, Boomars R, Kooij FO, den Tex P, Koster RW, Hollmann MW. Optimizing airway management and ventilation during prehospital advanced life support in out-of-hospital cardiac arrest: A narrative review. Best Pract Res Clin Anaesthesiol 2020; 35:67-82. [PMID: 33742579 DOI: 10.1016/j.bpa.2020.11.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/03/2020] [Accepted: 11/06/2020] [Indexed: 12/20/2022]
Abstract
Airway management and ventilation are essential components of cardiopulmonary resuscitation to achieve oxygen delivery in order to prevent hypoxic injury and increase the chance of survival. Weighing the relative benefits and downsides, the best approach is a staged strategy; start with a focus on high-quality chest compressions and defibrillation, then optimize mask ventilation while preparing for advanced airway management with a supraglottic airway device. Endotracheal intubation can still be indicated, but has the largest downsides of all advanced airway techniques. Whichever stage of airway management, ventilation and chest compression quality should be closely monitored. Capnography has many advantages and should be used routinely. Optimizing ventilation strategies, harmonizing ventilation with mechanical chest compression devices, and implementation in complex and stressful environments are challenges we need to face through collaborative innovation, research, and implementation.
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Affiliation(s)
- Hans van Schuppen
- Amsterdam UMC, University of Amsterdam, Department of Anesthesiology, Meibergdreef 9, Amsterdam, the Netherlands.
| | - René Boomars
- Regional Ambulance Service Utrecht (RAVU), Jan van Eijcklaan 6, Bilthoven, the Netherlands
| | - Fabian O Kooij
- Amsterdam UMC, University of Amsterdam, Department of Anesthesiology, Meibergdreef 9, Amsterdam, the Netherlands; Amsterdam UMC, Vrije Universiteit Amsterdam, Helicopter Mobile Medical Team (MMT), De Boelelaan 1117, Amsterdam, the Netherlands
| | - Paul den Tex
- University of Amsterdam, Meibergdreef 9, Amsterdam, the Netherlands
| | - Rudolph W Koster
- Amsterdam UMC, University of Amsterdam, Amsterdam Resuscitation Studies (ARREST), Meibergdreef 9, Amsterdam, the Netherlands
| | - Markus W Hollmann
- Amsterdam UMC, University of Amsterdam, Department of Anesthesiology, Meibergdreef 9, Amsterdam, the Netherlands
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Personalized physiology-guided resuscitation in highly monitored patients with cardiac arrest-the PERSEUS resuscitation protocol. Heart Fail Rev 2020; 24:473-480. [PMID: 30741366 DOI: 10.1007/s10741-019-09772-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Resuscitation guidelines remain uniform across all cardiac arrest patients, focusing on the delivery of chest compressions to a standardized rate and depth and algorithmic vasopressor dosing. However, individualizing resuscitation to the appropriate hemodynamic and ventilatory goals rather than a standard "one-size-fits-all" treatment seems a promising new therapeutic strategy. In this article, we present a new physiology-guided treatment strategy to titrate the resuscitation efforts to patient's physiologic response after cardiac arrest. This approach can be applied during resuscitation attempts in highly monitored patients, such as those in the operating room or the intensive care unit, and could serve as a method for improving tissue perfusion and oxygenation while decreasing post-resuscitation adverse effects.
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Chalkias A, Xanthos T. Airway Pressure Monitoring May Improve Small Airway Flow, Hemodynamics, and Tissue Oxygenation. Am J Respir Crit Care Med 2019; 199:928-929. [PMID: 30605346 PMCID: PMC6444660 DOI: 10.1164/rccm.201811-2075le] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Athanasios Chalkias
- 1 University of Thessaly Larisa, Greece.,2 Hellenic Society of Cardiopulmonary Resuscitation Athens, Greece and
| | - Theodoros Xanthos
- 2 Hellenic Society of Cardiopulmonary Resuscitation Athens, Greece and.,3 European University Cyprus Nicosia, Cyprus
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Azeli Y, Lorente Olazabal JV, Monge García MI, Bardají A. Understanding the Adverse Hemodynamic Effects of Serious Thoracic Injuries During Cardiopulmonary Resuscitation: A Review and Approach Based on the Campbell Diagram. Front Physiol 2019; 10:1475. [PMID: 31849717 PMCID: PMC6901598 DOI: 10.3389/fphys.2019.01475] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 11/15/2019] [Indexed: 01/29/2023] Open
Abstract
Chest compressions during cardiopulmonary resuscitation (CPR) generate cardiac output during cardiac arrest. Their quality performance is key to achieving the return of spontaneous circulation. Serious thoracic injuries (STIs) are common during CPR, and they can change the shape and mechanics of the thorax. Little is known about their hemodynamic effects, so a review of this emerging concept is necessary. The Campbell diagram (CD) is a theoretical framework that integrates the lung and chest wall pressure-volume curves, allowing us to assess the consequences of STIs on respiratory mechanics and hemodynamics. STIs produce a decrease in the compliance of the chest wall and lung. The representation of STIs on the CD shows a decrease in the intrathoracic negative pressure and a functional residual capacity decrease during the thoracic decompression, leading to a venous return impairment. The thorax with STIs is more vulnerable to the adverse hemodynamic effects of leaning, hyperventilation, and left ventricular outflow tract obstruction during CPR. A better understanding of the effects of STIs during CPR, and the study of avoidable injuries, can help to improve the effectiveness of chest compressions and the survival in cardiac arrest.
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Affiliation(s)
- Youcef Azeli
- Sistema d'Emergències Mèdiques de Catalunya, Barcelona, Spain.,Emergency Department, Sant Joan University Hospital, Reus, Spain.,Institut d'Investigació Sanitari Pere Virgili, Tarragona, Spain
| | - Juan Víctor Lorente Olazabal
- Clinical Management Anaesthesiology Unit, Resuscitation and Pain Therapy, Juan Ramón Jiménez Hospital, Huelva, Spain.,School of Medicine and Health Sciences, International University of Catalonia (IUC), Barcelona, Spain
| | | | - Alfredo Bardají
- Department of Cardiology, Joan XXIII University Hospital, Tarragona, Spain.,School of Medicine, Rovira i Virgili University, Tarragona, Spain
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Tan D, Sun J, Geng P, Ling B, Xu J, Walline J, Yu X. Duration of cardiac arrest requires different ventilation volumes during cardiopulmonary resuscitation in a pig model. J Clin Monit Comput 2019; 34:525-533. [PMID: 31183772 DOI: 10.1007/s10877-019-00336-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 06/05/2019] [Indexed: 11/27/2022]
Abstract
There are few studies examining the ventilation strategies recommended by current CPR guidelines. We investigated the influence of different minute volume applying to untreated cardiac arrest with different duration, on resuscitation effects in a pig model. 32 Landrace pigs with 4 or 8 min (16 pigs each) ventricular fibrillation (VF) randomly received two ventilation strategies during CPR. "Guideline" groups received mechanical ventilation with a tidal volume of 7 ml/kg and a frequency of 10/min, while "Baseline" groups received a tidal volume (10 ml/kg) and a frequency used at baseline to maintain an end-tidal PCO2 (PETCO2) between 35 and 40 mmHg before VF. Mean airway pressures and intrathoracic pressures (PIT) in the Baseline-4 min group were significantly higher than those in the Guideline-4 min group (all P < 0.05). Similar results were observed in the 8 min pigs, except for no significant difference in minimal PIT and PETCO2 during 10 min of CPR. Venous pH and venous oxygen saturation were significantly higher in the Baseline-8 min group compared to the Guideline-8 min group (all P < 0.05). Aortic pressure in the Baseline-8 min group was higher than in the Guideline-8 min group. Seven pigs in each subgroup of 4 min VF models achieved the return of spontaneous circulation (ROSC). Higher ROSC was observed in the Baseline-8 min group than in the Guideline-8 min group (87.5% vs. 37.5%, P = 0.039). For 4 min VF but not 8 min VF, a guideline-recommended ventilation strategy had satisfactory results during CPR. A higher minute ventilation resulted in better outcomes for subjects with 8 min of untreated VF through thoracic pump.
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Affiliation(s)
- Dingyu Tan
- Department of Emergency, Northern Jiangsu People's Hospital and Clinical Medical College of Yangzhou University, Yangzhou, 225001, China.
| | - Jiayan Sun
- Department of Pharmacy, Northern Jiangsu People's Hospital and Clinical Medical College of Yangzhou University, Yangzhou, China
| | - Ping Geng
- Department of Emergency, Northern Jiangsu People's Hospital and Clinical Medical College of Yangzhou University, Yangzhou, 225001, China
| | - Bingyu Ling
- Department of Emergency, Northern Jiangsu People's Hospital and Clinical Medical College of Yangzhou University, Yangzhou, 225001, China
| | - Jun Xu
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, 100730, China.
| | - Joseph Walline
- Division of Emergency Medicine, Department of Surgery, Saint Louis University Hospital, Saint Louis, MO, USA
| | - Xuezhong Yu
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, 100730, China
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The effect of ventilation rate on outcome in adults receiving cardiopulmonary resuscitation. Resuscitation 2019; 138:243-249. [DOI: 10.1016/j.resuscitation.2019.03.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Revised: 03/18/2019] [Accepted: 03/21/2019] [Indexed: 11/24/2022]
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11
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Benoit JL, McMullan JT, Wang HE, Xie C, Xu P, Hart KW, Stolz U, Lindsell CJ. Timing of Advanced Airway Placement after Witnessed Out-of-Hospital Cardiac Arrest. PREHOSP EMERG CARE 2019; 23:838-846. [DOI: 10.1080/10903127.2019.1595236] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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12
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Grieco DL, Brochard L, Richard JCM. Reply to Chalkias and Xanthos: Airway Pressure Monitoring May Improve Small Airway Flow, Hemodynamics, and Tissue Oxygenation. Am J Respir Crit Care Med 2019; 199:929-930. [PMID: 30605345 PMCID: PMC6444657 DOI: 10.1164/rccm.201811-2234le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Affiliation(s)
- Domenico L. Grieco
- St. Michael’s HospitalToronto, Canada
- University of TorontoToronto, Canada
- Catholic University of the Sacred HeartRome, Italy
| | - Laurent Brochard
- St. Michael’s HospitalToronto, Canada
- University of TorontoToronto, Canada
- Catholic University of the Sacred HeartRome, Italy
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Speer T, Dersch W, Kleine B, Neuhaus C, Kill C. Mechanical Ventilation During Resuscitation: How Manual Chest Compressions Affect a Ventilator's Function. Adv Ther 2017; 34:2333-2344. [PMID: 28983829 DOI: 10.1007/s12325-017-0615-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Indexed: 10/18/2022]
Abstract
INTRODUCTION Guidelines for resuscitation recommend positive-pressure ventilation with a fixed ventilation rate as provided by an automated transport ventilator during cardiopulmonary resuscitation (CPR) with a secured airway. We investigated the influence of manual chest compressions (CC) on the accuracy of ventilator presets and the quality of CC with intermittent positive-pressure ventilation (IPPV), bilevel ventilation (BiLevel), and the novel ventilation mode chest compression synchronized ventilation (CCSV) in a simulation model. METHODS Ninety paramedics performed continuous CC for 2 min on a modified advanced life support mannequin with a realistic lung model. IPPV, BiLevel, and CCSV were applied in a randomized order. CCSV is a novel type of pressure-controlled ventilation with short insufflations synchronized with CC, which are stopped before decompression begins. The ventilator presets (tolerance range) were IPPV Vt = 450 (400-500) ml, PEEP = 0 hPa, f = 10/min; BiLevel Pinsp = 19 (17.1-20.9) hPa, PEEP = 5 hPa, f = 10/min; CCSV Pinsp = 60 (54-66) hPa, PEEP = 0 hPa, Tinsp = 205 ms, f = CC rate. Preset values were compared with the measured results. Values were defined as correct within a tolerance range. Quality of CC was evaluated using ERC guidelines (depth >50 mm, CC rate 100-120/min). RESULTS Median (25th/75th percentiles) IPPV V t = 399 (386/411) ml, BiLevel Pinsp = 22.0 (19.7/25.6) hPa, and CCSV Pinsp = 55.2 (52.6/56.7) hPa. Relative frequency of delivering correct ventilation parameters according to ventilation mode: IPPV = 40 (0/100)% vs. BiLevel = 20 (0/100)%, p = 0.37 and vs. CCSV = 71 (50/83)%, p < 0.02. Pinsp was too high in BiLevel = 80 (0/100)% vs. CCSV = 0(0/0)%, p < 0.001. CC depth: IPPV 56 (48/63) mm, BiLevel 57 (48/63) mm, CCSV 60 (52/67) mm; CC rate: IPPV 117 (105/124)/min, BiLevel 116 (107/123)/min, CCSV 117 (107/125)/min. CONCLUSION When compared to IPPV and BiLevel, CCSV works best with preset values, without exceeding the upper pressure preset during simulated CPR. Quality of CC is not negatively affected by any of the ventilation patterns. FUNDING Parts of this study were supported by Weinmann Emergency Medical Technology GmbH + Co.KG.
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Galatianou I, Karlis G, Apostolopoulos A, Intas G, Chalari E, Gulati A, Iacovidou N, Chalkias A, Xanthos T. Body mass index and outcome of out-of-hospital cardiac arrest patients not treated by targeted temperature management. Am J Emerg Med 2017; 35:1247-1251. [DOI: 10.1016/j.ajem.2017.03.050] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 02/17/2017] [Accepted: 03/21/2017] [Indexed: 10/19/2022] Open
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Chalkias A, Pavlopoulos F, Koutsovasilis A, d’Aloja E, Xanthos T. Reply to Letter: Mean airway pressure and outcome of OHCA. Resuscitation 2017; 112:e1. [DOI: 10.1016/j.resuscitation.2016.12.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Accepted: 12/11/2016] [Indexed: 10/20/2022]
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Tan D, Xu J, Shao S, Fu Y, Sun F, Zhang Y, Hu Y, Walline J, Zhu H, Yu X. Comparison of different inspiratory triggering settings in automated ventilators during cardiopulmonary resuscitation in a porcine model. PLoS One 2017; 12:e0171869. [PMID: 28187154 PMCID: PMC5302798 DOI: 10.1371/journal.pone.0171869] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2016] [Accepted: 01/26/2017] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Mechanical ventilation via automated in-hospital ventilators is quite common during cardiopulmonary resuscitation. It is not known whether different inspiratory triggering sensitivity settings of ordinary ventilators have different effects on actual ventilation, gas exchange and hemodynamics during resuscitation. METHODS 18 pigs enrolled in this study were anaesthetized and intubated. Continuous chest compressions and mechanical ventilation (volume-controlled mode, 100% O2, respiratory rate 10/min, and tidal volumes 10ml/kg) were performed after 3 minutes of ventricular fibrillation. Group trig-4, trig-10 and trig-20 (six pigs each) were characterized by triggering sensitivities of 4, 10 and 20 (cmH2O for pressure-triggering and L/min for flow-triggering), respectively. Additionally, each pig in each group was mechanically ventilated using three types of inspiratory triggering (pressure-triggering, flow-triggering and turned-off triggering) of 5 minutes duration each, and each animal matched with one of six random assortments of the three different triggering settings. Blood gas samples, respiratory and hemodynamic parameters for each period were all collected and analyzed. RESULTS In each group, significantly lower actual respiratory rate, minute ventilation volume, mean airway pressure, arterial pH, PaO2, and higher end-tidal carbon dioxide, aortic blood pressure, coronary perfusion pressure, PaCO2 and venous oxygen saturation were observed in the ventilation periods with a turned-off triggering setting compared to those with pressure- or flow- triggering (all P<0.05), except when compared with pressure-triggering of 20 cmH2O (respiratory rate 10.5[10/11.3]/min vs 12.5[10.8/13.3]/min, P = 0.07; coronary perfusion pressure 30.3[24.5/31.6] mmHg vs 27.4[23.7/29] mmHg, P = 0.173; venous oxygen saturation 46.5[32/56.8]% vs 41.5[33.5/48.5]%, P = 0.575). CONCLUSIONS Ventilation with pressure- or flow-triggering tends to induce hyperventilation and deteriorating gas exchange and hemodynamics during CPR. A turned-off patient triggering or a pressure-triggering of 20 cmH2O is preferred for ventilation when an ordinary inpatient hospital ventilator is used during resuscitation.
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Affiliation(s)
- Dingyu Tan
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical sciences, Beijing, China
| | - Jun Xu
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical sciences, Beijing, China
| | - Shihuan Shao
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical sciences, Beijing, China
| | - Yangyang Fu
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical sciences, Beijing, China
| | - Feng Sun
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical sciences, Beijing, China
| | - Yazhi Zhang
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical sciences, Beijing, China
| | - Yingying Hu
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical sciences, Beijing, China
| | - Joseph Walline
- Division of Emergency Medicine, Department of Surgery, Saint Louis University Hospital, Saint Louis, Missouri
| | - Huadong Zhu
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical sciences, Beijing, China
| | - Xuezhong Yu
- Department of Emergency, Peking Union Medical College Hospital, Chinese Academy of Medical sciences, Beijing, China
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17
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Jo S, Lee JB, Jin Y, Jeong T, Yoon J. Mean airway pressure and outcome of OHCA. Resuscitation 2016; 112:e3. [PMID: 28011291 DOI: 10.1016/j.resuscitation.2016.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 12/04/2016] [Indexed: 11/18/2022]
Affiliation(s)
- Sion Jo
- Department of Emergency Medicine, Research Institute of Clinical Medicine of Chonbuk National University and - Biomedical Research Institute of Chonbuk National University Hospital, Jeonju-si, Republic of Korea
| | - Jae Baek Lee
- Department of Emergency Medicine, Research Institute of Clinical Medicine of Chonbuk National University and - Biomedical Research Institute of Chonbuk National University Hospital, Jeonju-si, Republic of Korea.
| | - Youngho Jin
- Department of Emergency Medicine, Research Institute of Clinical Medicine of Chonbuk National University and - Biomedical Research Institute of Chonbuk National University Hospital, Jeonju-si, Republic of Korea
| | - Taeoh Jeong
- Department of Emergency Medicine, Research Institute of Clinical Medicine of Chonbuk National University and - Biomedical Research Institute of Chonbuk National University Hospital, Jeonju-si, Republic of Korea
| | - Jaechol Yoon
- Department of Emergency Medicine, Research Institute of Clinical Medicine of Chonbuk National University and - Biomedical Research Institute of Chonbuk National University Hospital, Jeonju-si, Republic of Korea
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