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Barbarot N, Tinelli A, Fillatre P, Debarre M, Magalhaes E, Massart N, Wallois J, Legay F, Mari A. The depth of neuromuscular blockade is not related to chest wall elastance and respiratory mechanics in moderate to severe acute respiratory distress syndrome patients. A prospective cohort study. J Crit Care 2024; 80:154505. [PMID: 38141458 DOI: 10.1016/j.jcrc.2023.154505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 09/04/2023] [Accepted: 12/01/2023] [Indexed: 12/25/2023]
Abstract
BACKGROUND Data concerning the depth of neuromuscular blockade (NMB) required for effective relaxation of the respiratory muscles in ARDS are scarce. We hypothesised that complete versus partial NMB can modify respiratory mechanics. METHOD Prospective study to compare the respiratory mechanics of ARDS patients according to the NMB depth. Each patient was analysed at two times: deep NMB (facial train of four count (TOFC) = 0) and intermediate NMB (TOFC >0). The primary endpoint was the comparison of chest wall elastance (ELCW) according to the NMB level. RESULTS 33 ARDS patients were analysed. There was no statistical difference between the ELCW at TOFC = 0 compared to TOFC >0: 7 cmH2O/l [5.7-9.5] versus 7 cmH2O/l [5.3-10.8] (p = 0.36). The depth of NMB did not modify the expiratory nor inspiratory oesophageal pressure (Pesexp = 8 cmH2O [5-9.5] at TOFC = 0 versus 7 cmH2O [5-10] at TOFC >0; (p = 0.16) and Pesinsp = 10 cmH2O [8.2-13] at TOFC = 0 versus 10 cmH2O [8-13] at TOFC >0; (p = 0.12)). CONCLUSION In ARDS, the relaxation of the respiratory muscles seems to be independent of the NMB level.
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2
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Bogot NR, Steiner R, Helviz Y, Weiss C, Cherniavsky K, Pichkhadze O, Ball L, Frank Y, Levin P, Pelosi P, Benjaminov O, Einav S. Distribution of Aeration and Pulmonary Blood Volume in Healthy, ARDS and COVID-19 Lungs: A Dual-Energy Computed Tomography Retrospective Cohort Study. Acad Radiol 2023; 30:2548-2556. [PMID: 36966073 PMCID: PMC10035816 DOI: 10.1016/j.acra.2023.01.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 01/20/2023]
Abstract
RATIONALE AND OBJECTIVES Few reports have studied lung aeration and perfusion in normal lungs, COVID-19, and ARDS from other causes (NC-ARDS) using dual-energy computed tomography pulmonary angiograms (DE-CTPA). To describe lung aeration and blood-volume distribution using DE-CTPAs of patients with NC-ARDS, COVID-19, and controls with a normal DE-CTPA ("healthy lungs"). We hypothesized that each of these conditions has unique ranges of aeration and pulmonary blood volumes. MATERIALS AND METHODS This retrospective, single-center study of DE-CTPAs included patients with COVID-19, NC-ARDS (Berlin criteria), and controls. Patients with macroscopic pulmonary embolisms were excluded. The outcomes studied were the (1) lung blood-volume in areas with different aeration levels (normal, ground glass opacities [GGO], consolidated lung) and (2) aeration/blood-volume ratios. RESULTS Included were 20 patients with COVID-19 (10 milds, 10 moderate-severe), six with NC-ARDS, and 12 healthy-controls. Lung aeration was lowest in patients with severe COVID-19 24% (IQR13%-31%) followed by those with NC-ARDS 40%(IQR21%-46%). Blood-volume in GGO was lowest in patients with COVID-19 [moderate-severe:-28.6 (IQR-33.1-23.2); mild: -30.1 (IQR-33.3-23.4)] and highest in normally aerated areas in NC-ARDS -37.4 (IQR-52.5-30.2-) and moderate-severe COVID-19 -33.5(IQR-44.2-28.5). The median aeration/blood-volume ratio was lowest in severe COVID-19 but some values overlapped with those observed among patients with NC-ARDS. CONCLUSION Severe COVID-19 disease is associated with low total aerated lung volume and blood-volume in areas with GGO and overall aeration/blood volume ratios, and with high blood volume in normal lung areas. In this hypothesis-generating study, these findings were most pronounced in severe COVID disease. Larger studies are needed to confirm these preliminary findings.
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Affiliation(s)
| | | | - Yigal Helviz
- The Intensive Care Unit, Jerusalem, Israel; The Shaare Zedek Medical Center, Hebrew University Faculty of Medicine, Samuel Byte 12, Jerusalem, Israel
| | - Chedva Weiss
- The Intensive Care Unit, Jerusalem, Israel; Department of pediatrics, Hadassah Medical Center Jerusalem, Jerusalem, Israel
| | | | | | - Lorenzo Ball
- The Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, Genoa, Italy; Anesthesia and Intensive Care, San Martino Policlinico Hospital, IRCCS for Oncology and Neurosciences, Genoa, Italy
| | - Yigal Frank
- Department of Radiology(,) Jerusalem, Israel
| | - Philip Levin
- The Intensive Care Unit, Jerusalem, Israel; The Shaare Zedek Medical Center, Hebrew University Faculty of Medicine, Samuel Byte 12, Jerusalem, Israel
| | - Paolo Pelosi
- The Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, Genoa, Italy; Anesthesia and Intensive Care, San Martino Policlinico Hospital, IRCCS for Oncology and Neurosciences, Genoa, Italy
| | | | - Sharon Einav
- The Intensive Care Unit, Jerusalem, Israel; The Shaare Zedek Medical Center, Hebrew University Faculty of Medicine, Samuel Byte 12, Jerusalem, Israel.
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3
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Swenson KE, Hardin CC. Pathophysiology of Hypoxemia in COVID-19 Lung Disease. Clin Chest Med 2023; 44:239-248. [PMID: 37085217 PMCID: PMC9682047 DOI: 10.1016/j.ccm.2022.11.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
As the pandemic has progressed, our understanding of hypoxemia in coronavirus disease 2019 (COVID-19) lung disease has become more nuanced, although much remains to be understood. In this article, we review ventilation-perfusion mismatching in COVID-19 and the evidence to support various biologic theories offered in explanation. In addition, the relationship between hypoxemia and other features of severe COVID-19 lung disease such as respiratory symptoms, radiographic abnormalities, and pulmonary mechanics is explored. Recognizing and understanding hypoxemia in COVID-19 lung disease remains essential for risk stratification, prognostication, and choice of appropriate treatments in severe COVID-19.
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Affiliation(s)
- Kai E Swenson
- Division of Thoracic Surgery and Interventional Pulmonology, Beth Israel Deaconess Medical Center, Boston, MA, USA; Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Bulfinch 148, 55 Fruit Street, Boston, MA 02114, USA.
| | - Charles C Hardin
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Bulfinch 148, 55 Fruit Street, Boston, MA 02114, USA
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4
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Baedorf-Kassis EN, Glowala J, Póka KB, Wadehn F, Meyer J, Talmor D. Reverse triggering neural network and rules-based automated detection in acute respiratory distress syndrome. J Crit Care 2023; 75:154256. [PMID: 36701820 PMCID: PMC10173144 DOI: 10.1016/j.jcrc.2023.154256] [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: 09/26/2022] [Revised: 12/21/2022] [Accepted: 01/08/2023] [Indexed: 01/27/2023]
Abstract
PURPOSE Dyssynchrony may cause lung injury and is associated with worse outcomes in mechanically ventilated patients. Reverse triggering (RT) is a common type of dyssynchrony presenting with several phenotypes which may directly cause lung injury and be difficult to identify. Due to these challenges, automated software to assist in identification is needed. MATERIALS AND METHODS This was a prospective observational study using a training set of 15 patients and a validation dataset of 13 patients. RT events were manually identified and compared with "rules-based" programs (with and without esophageal manometry and reverse triggering with breath stacking), and were used to train a neural network artificial intelligence (AI) program. RT phenotypes were identified using previously defined rules. Performance of the programs was compared via sensitivity, specificity, positive predictive value (PPV) and F1 score. RESULTS 33,244 breaths were manually analyzed, with 8718 manually identified as reverse-triggers. The rules-based and AI programs yielded excellent specificity (>95% in all programs) and F1 score (>75% in all programs). RT with breath stacking (24.4%) and mid-cycle RT (37.8%) were the most common phenotypes. CONCLUSIONS Automated detection of RT demonstrated good performance, with the potential application of these programs for research and clinical care.
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Affiliation(s)
- Elias N Baedorf-Kassis
- Division of Pulmonary and Critical Care Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA; Department of Anesthesia, Critical Care and Pain, Beth Israel Deaconess Medical Center, Boston, MA, USA.
| | - Jakub Glowala
- Division of Pulmonary and Critical Care Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA
| | | | | | | | - Daniel Talmor
- Division of Pulmonary and Critical Care Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA; Department of Anesthesia, Critical Care and Pain, Beth Israel Deaconess Medical Center, Boston, MA, USA
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5
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Ding B, Xu F, Wang J, Pan C, Pang J, Chen Y, Li K. Design and evaluation of portable emergency ventilator prototype with novel titration methods. Biomed Signal Process Control 2023. [DOI: 10.1016/j.bspc.2023.104619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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6
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Azizi BA, Munoz-Acuna R, Suleiman A, Ahrens E, Redaelli S, Tartler TM, Chen G, Jung B, Talmor D, Baedorf-Kassis EN, Schaefer MS. Mechanical power and 30-day mortality in mechanically ventilated, critically ill patients with and without Coronavirus Disease-2019: a hospital registry study. J Intensive Care 2023; 11:14. [PMID: 37024938 PMCID: PMC10077655 DOI: 10.1186/s40560-023-00662-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 03/31/2023] [Indexed: 04/08/2023] Open
Abstract
BACKGROUND Previous studies linked a high intensity of ventilation, measured as mechanical power, to mortality in patients suffering from "classic" ARDS. By contrast, mechanically ventilated patients with a diagnosis of COVID-19 may present with intact pulmonary mechanics while undergoing mechanical ventilation for longer periods of time. We investigated whether an association between higher mechanical power and mortality is modified by a diagnosis of COVID-19. METHODS This retrospective study included critically ill, adult patients who were mechanically ventilated for at least 24 h between March 2020 and December 2021 at a tertiary healthcare facility in Boston, Massachusetts. The primary exposure was median mechanical power during the first 24 h of mechanical ventilation, calculated using a previously validated formula. The primary outcome was 30-day mortality. As co-primary analysis, we investigated whether a diagnosis of COVID-19 modified the primary association. We further investigated the association between mechanical power and days being alive and ventilator free and effect modification of this by a diagnosis of COVID-19. Multivariable logistic regression, effect modification and negative binomial regression analyses adjusted for baseline patient characteristics, severity of disease and in-hospital factors, were applied. RESULTS 1,737 mechanically ventilated patients were included, 411 (23.7%) suffered from COVID-19. 509 (29.3%) died within 30 days. The median mechanical power during the first 24 h of ventilation was 19.3 [14.6-24.0] J/min in patients with and 13.2 [10.2-18.0] J/min in patients without COVID-19. A higher mechanical power was associated with 30-day mortality (ORadj 1.26 per 1-SD, 7.1J/min increase; 95% CI 1.09-1.46; p = 0.002). Effect modification and interaction analysis did not support that this association was modified by a diagnosis of COVID-19 (95% CI, 0.81-1.38; p-for-interaction = 0.68). A higher mechanical power was associated with a lower number of days alive and ventilator free until day 28 (IRRadj 0.83 per 7.1 J/min increase; 95% CI 0.75-0.91; p < 0.001, adjusted risk difference - 2.7 days per 7.1J/min increase; 95% CI - 4.1 to - 1.3). CONCLUSION A higher mechanical power is associated with elevated 30-day mortality. While patients with COVID-19 received mechanical ventilation with higher mechanical power, this association was independent of a concomitant diagnosis of COVID-19.
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Affiliation(s)
- Basit A Azizi
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Brookline Ave 330, Boston, MA, USA
- Center for Anesthesia Research Excellence (CARE), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Ricardo Munoz-Acuna
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Brookline Ave 330, Boston, MA, USA
- Center for Anesthesia Research Excellence (CARE), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Aiman Suleiman
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Brookline Ave 330, Boston, MA, USA
- Center for Anesthesia Research Excellence (CARE), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Elena Ahrens
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Brookline Ave 330, Boston, MA, USA
- Center for Anesthesia Research Excellence (CARE), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Simone Redaelli
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Brookline Ave 330, Boston, MA, USA
- Center for Anesthesia Research Excellence (CARE), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Tim M Tartler
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Brookline Ave 330, Boston, MA, USA
- Center for Anesthesia Research Excellence (CARE), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Guanqing Chen
- Center for Anesthesia Research Excellence (CARE), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Boris Jung
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Brookline Ave 330, Boston, MA, USA
- Center for Anesthesia Research Excellence (CARE), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Daniel Talmor
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Brookline Ave 330, Boston, MA, USA
| | - Elias N Baedorf-Kassis
- Division of Pulmonary and Critical Care, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Maximilian S Schaefer
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Brookline Ave 330, Boston, MA, USA.
- Center for Anesthesia Research Excellence (CARE), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
- Department of Anesthesiology, Duesseldorf University Hospital, Duesseldorf, Germany.
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7
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Hennessey E, Bittner E, White P, Kovar A, Meuchel L. Intraoperative Ventilator Management of the Critically Ill Patient. Anesthesiol Clin 2023; 41:121-140. [PMID: 36871995 PMCID: PMC9985493 DOI: 10.1016/j.anclin.2022.11.004] [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: 03/07/2023]
Abstract
Strategies for the intraoperative ventilator management of the critically ill patient focus on parameters used for lung protective ventilation with acute respiratory distress syndrome, preventing or limiting the deleterious effects of mechanical ventilation, and optimizing anesthetic and surgical conditions to limit postoperative pulmonary complications for patients at risk. Patient conditions such as obesity, sepsis, the need for laparoscopic surgery, or one-lung ventilation may benefit from intraoperative lung protective ventilation strategies. Anesthesiologists can use risk evaluation and prediction tools, monitor advanced physiologic targets, and incorporate new innovative monitoring techniques to develop an individualized approach for patients.
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Affiliation(s)
- Erin Hennessey
- Stanford University - School of Medicine Department of Anesthesiology, Perioperative and Pain Medicine, 300 Pasteur Drive, Room H3580, Stanford, CA 94305, USA.
| | - Edward Bittner
- Department of Anesthesia, Critical Care and Pain Medicine, Harvard Medical School, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Peggy White
- University of Florida College of Medicine, Department of Anesthesiology, 1500 SW Archer Road, PO Box 100254, Gainesville, FL 32610, USA
| | - Alan Kovar
- Oregon Health and Science University, 3161 SW Pavilion Loop, Portland, OR 97239, USA
| | - Lucas Meuchel
- Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA
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8
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Reddy MP, Subramaniam A, Chua C, Ling RR, Anstey C, Ramanathan K, Slutsky AS, Shekar K. Respiratory system mechanics, gas exchange, and outcomes in mechanically ventilated patients with COVID-19-related acute respiratory distress syndrome: a systematic review and meta-analysis. THE LANCET. RESPIRATORY MEDICINE 2022; 10:1178-1188. [PMID: 36335956 PMCID: PMC9708089 DOI: 10.1016/s2213-2600(22)00393-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Revised: 07/28/2022] [Accepted: 09/14/2022] [Indexed: 11/06/2022]
Abstract
The association of respiratory mechanics, particularly respiratory system static compliance (CRS), with severity of hypoxaemia in patients with COVID-19-related acute respiratory distress syndrome (ARDS) has been widely debated, with some studies reporting distinct ARDS phenotypes based on CRS. Ascertaining whether such phenotypes exist is important, because they might indicate the need for ventilation strategies that differ from those used in patients with ARDS due to other causes. In a systematic review and meta-analysis of studies published between Dec 1, 2019, and March 14, 2022, we evaluated respiratory system mechanics, ventilator parameters, gas exchange parameters, and clinical outcomes in patients with COVID-19-related ARDS. Among 11 356 patients in 37 studies, mean reported CRS, measured close to the time of endotracheal intubation, was 35·8 mL/cm H2O (95% CI 33·9-37·8; I2=96·9%, τ2=32·6). Pooled mean CRS was normally distributed. Increasing ARDS severity (assessed by PaO2/FiO2 ratio as mild, moderate, or severe) was associated with decreasing CRS. We found no evidence for distinct CRS-based clinical phenotypes in patients with COVID-19-related ARDS, and we therefore conclude that no change in conventional lung-protective ventilation strategies is warranted. Future studies should explore the personalisation of mechanical ventilation strategies according to factors including respiratory system mechanics and haemodynamic status in patients with ARDS.
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Affiliation(s)
- Mallikarjuna Ponnapa Reddy
- Department of Intensive Care Medicine, Calvary Hospital, Canberra, ACT, Australia,Department of Intensive Care Medicine, Peninsula Health, Frankston, VIC, Australia,Correspondence to: Dr Mallikarjuna Ponnapa Reddy, Department of Intensive Care Medicine, Calvary Hospital, Canberra ACT 2617, Australia
| | - Ashwin Subramaniam
- Department of Intensive Care Medicine, Peninsula Health, Frankston, VIC, Australia,Australian and New Zealand Intensive Care Research Centre, Department of Epidemiology and Preventive Medicine, Monash University, Clayton, VIC, Australia,Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC, Australia,Peninsula Clinical School, Monash University, Clayton, VIC, Australia
| | - Clara Chua
- Department of Intensive Care Medicine, Peninsula Health, Frankston, VIC, Australia,Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC, Australia
| | - Ryan Ruiyang Ling
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Christopher Anstey
- Prince Charles Hospital Northside Clinical Unit, Faculty of Medicine University of Queensland, Brisbane, QLD, Australia,School of Medicine and Dentistry, Griffith University, Gold Coast, QLD, Australia
| | - Kollengode Ramanathan
- Department of Surgery, National University of Singapore, Singapore,Cardiothoracic Intensive Care Unit, National University Heart Centre, National University Hospital, Singapore
| | - Arthur S Slutsky
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, St Michael's Hospital, Unity Health Toronto, Toronto, ON, Canada,Department of Medicine and Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, ON, Canada
| | - Kiran Shekar
- Prince Charles Hospital Northside Clinical Unit, Faculty of Medicine University of Queensland, Brisbane, QLD, Australia,Department of Intensive Care Medicine, Bond University, Gold Coast, QLD, Australia,Adult Intensive Care Services and Critical Care Research Group, the Prince Charles Hospital, Brisbane, QLD, Australia,Department of Intensive Care Medicine, Queensland University of Technology, Brisbane, QLD, Australia
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Somhorst P, Gommers D, Endeman H. Advanced respiratory monitoring in mechanically ventilated patients with coronavirus disease 2019-associated acute respiratory distress syndrome. Curr Opin Crit Care 2022; 28:66-73. [PMID: 34772836 PMCID: PMC8711301 DOI: 10.1097/mcc.0000000000000905] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
PURPOSE OF REVIEW To summarize the current knowledge about the application of advanced monitoring techniques in coronavirus disease 2019 (COVID-19). RECENT FINDINGS Due to the heterogeneity between patients, management of COVID-19 requires daily monitoring of and/or aeration and inspiratory effort. Electrical impedance tomography can be used to optimize positive end-expiratory pressure, monitor the response to changes in treatment or body position and assess pulmonary perfusion and ventilation/perfusion matching. Lung ultrasound is more readily available and can be used to measure and monitor recruitment, provide an indication of diaphragm function and pulmonary perfusion disturbances. Esophageal pressure measurements enable the calculation of the transpulmonary pressure and inspiratory effort in order to prevent excessive stress on the lung. While esophageal pressure measurements are the golden standard in determining inspiratory effort, alternatives like P0.1, negative pressure swing during a single airway occlusion and change in central venous pressure are more readily available and capable of diagnosing extreme inspiratory efforts. SUMMARY Although there is little data on the effectiveness of advanced monitoring techniques in COVID-19, regular monitoring should be a central part of the management of COVID-19-related acute respiratory distress syndrome (C-ARDS).
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Affiliation(s)
- Peter Somhorst
- Department of Intensive Care, Erasmus Medical Center, Rotterdam, The Netherlands
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10
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Yang X, Ma L. Post‑treatment with propofol inhibits inflammatory response in LPS‑induced alveolar type II epithelial cells. Exp Ther Med 2022; 23:249. [PMID: 35261621 PMCID: PMC8855515 DOI: 10.3892/etm.2022.11174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 01/12/2022] [Indexed: 11/21/2022] Open
Abstract
Over-inflammation and severe lung injury are major causes of morbidity and mortality in patients with coronavirus disease 2019 (COVID-19). With the COVID-19 pandemic, an increasing number of patients with preexisting lung injury and inflammation are undergoing surgery or artificial ventilation under sedation in intensive care units, where 2,6-diisopropylphenol (propofol) is a commonly used drug for sedation. The aim of the present study was to investigate whether post-inflammation treatment with propofol protects epithelial type II cells against inflammation in an in vitro model of inflammation. The A549 cell line, characterised as epithelial type II cells, were exposed to lipopolysaccharide (LPS) for 2 h and subsequently treated with different concentrations of propofol (0, 10, 25 or 50 µM) for 3 h. Western blot and reverse transcription-quantitative PCR analyses were used to detect the protein and mRNA expression levels, respectively, of CD14 and Toll-like receptor 4 (TLR4). Immunofluorescence staining was used to detect the in situ CD14 and TLR4 expression in epithelial type II cells. Tumor necrosis factor (TNF)-α production was also examined using ELISA. LPS significantly increased the expression of CD14 and TLR4, as well as the secretion of TNF-α. Post-treatment with 25 and 50 µM propofol of the LPS-treated cells significantly decreased CD14 and TLR4 expression, as well as TNF-α secretion, compared with the cells treated with LPS only, indicating that post-treatment with propofol alleviated inflammation and this effect was dose-dependent. The present study suggested that treatment with propofol after LPS administration has a protective effect on epithelial type II cells.
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Affiliation(s)
- Xilun Yang
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Ling Ma
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
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11
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Fusina F, Albani F, Crisci S, Morandi A, Tansini F, Beschi R, Rosano A, Natalini G. Respiratory system compliance at the same PEEP level is similar in COVID and non-COVID ARDS. Respir Res 2022; 23:7. [PMID: 35022054 PMCID: PMC8753591 DOI: 10.1186/s12931-022-01930-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 01/08/2022] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND The comparison of respiratory system compliance (Crs) between COVID and non-COVID ARDS patients has been the object of debate, but few studies have evaluated it when considering applied positive end expiratory pressure (PEEP), which is one of the known determinants of Crs itself. The aim of this study was to compare Crs taking into account the applied PEEP. METHODS Two cohorts of patients were created: those with COVID-ARDS and those with non-COVID ARDS. In the whole sample the association between Crs and type of ARDS at different PEEP levels was adjusted for anthropometric and clinical variables. As secondary analyses, patients were matched for predicted functional residual capacity and the same association was assessed. Moreover, the association between Crs and type of ARDS was reassessed at predefined PEEP level of 0, 5, 10, and 15 cmH2O with a propensity score-weighted linear model. RESULTS 367 patients were included in the study, 276 patients with COVID-ARDS and 91 with non-COVID ARDS. The association between Crs and type of ARDS was not significant in both the complete cohorts (p = 0.17) and in the matched cohorts (p = 0.92). This was true also for the propensity score weighted association at PEEP 5, 10 and 15 cmH2O, while it was statistically significant at PEEP 0 (with a median difference of 3 ml/cmH2O, which in our opinion is not clinically significant). CONCLUSIONS The compliance of the respiratory system is similar between COVID ARDS and non-COVID ARDS when calculated at the same PEEP level and while taking into account patients' anthropometric characteristics.
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Affiliation(s)
- Federica Fusina
- Department of Anesthesia, Intensive Care and Pain Medicine, Fondazione Poliambulanza Hospital, via Bissolati, 57, 25124, Brescia, Italy.
| | - Filippo Albani
- Department of Anesthesia, Intensive Care and Pain Medicine, Fondazione Poliambulanza Hospital, via Bissolati, 57, 25124, Brescia, Italy
| | - Serena Crisci
- Department of Anesthesia, Intensive Care and Pain Medicine, Fondazione Poliambulanza Hospital, via Bissolati, 57, 25124, Brescia, Italy
- Department of Anesthesiology and Intensive Care Medicine, Catholic University of The Sacred Heart, Rome, Italy
| | - Alessandro Morandi
- Department of Anesthesia, Intensive Care and Pain Medicine, Fondazione Poliambulanza Hospital, via Bissolati, 57, 25124, Brescia, Italy
| | - Francesca Tansini
- Department of Anesthesia, Intensive Care and Pain Medicine, Fondazione Poliambulanza Hospital, via Bissolati, 57, 25124, Brescia, Italy
- Department of Anesthesia and Intensive Care, University of Insubria, Varese, Lombardia, Italy
| | - Rasula Beschi
- Department of Anesthesia, Intensive Care and Pain Medicine, Fondazione Poliambulanza Hospital, via Bissolati, 57, 25124, Brescia, Italy
| | - Antonio Rosano
- Department of Anesthesia, Intensive Care and Pain Medicine, Fondazione Poliambulanza Hospital, via Bissolati, 57, 25124, Brescia, Italy
| | - Giuseppe Natalini
- Department of Anesthesia, Intensive Care and Pain Medicine, Fondazione Poliambulanza Hospital, via Bissolati, 57, 25124, Brescia, Italy
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De Vito EL. Possible Role of Corollary Discharge in Lack of Dyspnea in Patients With COVID-19 Disease. Front Physiol 2021; 12:719166. [PMID: 34483972 PMCID: PMC8415258 DOI: 10.3389/fphys.2021.719166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 07/09/2021] [Indexed: 01/08/2023] Open
Affiliation(s)
- Eduardo Luis De Vito
- Department of Pneumology and Pulmonary Laboratory, Institute of Medical Research, University of Buenos Aires, Buenos Aires, Argentina
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Kallet RH. 2020 Year in Review: Mechanical Ventilation During the First Year of the COVID-19 Pandemic. Respir Care 2021; 66:1341-1362. [PMID: 33972456 PMCID: PMC9994377 DOI: 10.4187/respcare.09257] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Coronavirus disease 2019 (COVID-19) represents the greatest medical crisis encountered in the young history of critical care and respiratory care. During the early months of the pandemic, when little was known about the virus, the acute hypoxemic respiratory failure it caused did not appear to fit conveniently or consistently into our classification of ARDS. This not only re-ignited a half-century's long simmering debate over taxonomy, but also fueled similar debates over how PEEP and lung-protective ventilation should be titrated, as well as the appropriate role of noninvasive ventilation in ARDS. COVID-19 ignited other debates on emerging concepts such as ARDS phenotypes and patient self-inflicted lung injury from vigorous spontaneous breathing. Over a year later, these early perplexities have receded into the background without having been reviewed or resolved. With a full year of evidence having been published, this narrative review systematically analyzes whether COVID-19-associated respiratory failure is essentially ARDS, with perhaps a somewhat different course of presentation. This includes a review of the severity of hypoxemia and derangements in pulmonary mechanics, PEEP requirements, recruitment potential, ability to achieve lung-protective ventilation goals, duration of mechanical ventilation, associated mortality, and response to noninvasive ventilation. This paper also reviews the concepts of ARDS phenotypes and patient self-inflicted lung injury as these are crucial to understanding the contentious debate over the nature and management of COVID-19.
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Affiliation(s)
- Richard H Kallet
- Department of Anesthesia and Perioperative Care, University of California, San Francisco at Zuckerberg San Francisco General Hospital and Trauma Center, San Francisco, California.
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Tonelli R, Busani S, Tabbì L, Fantini R, Castaniere I, Biagioni E, Mussini C, Girardis M, Clini E, Marchioni A. Inspiratory Effort and Lung Mechanics in Spontaneously Breathing Patients with Acute Respiratory Failure Due to COVID-19: A Matched Control Study. Am J Respir Crit Care Med 2021; 204:725-728. [PMID: 34214009 PMCID: PMC8521698 DOI: 10.1164/rccm.202104-1029le] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- Roberto Tonelli
- University of Modena and Reggio Emilia, 9306, PhD program Clinical and Experimental Medicine, Modena, Italy
| | - Stefano Busani
- Policlinico di Modena, 551871, Anesthesia and Intensive Care, Modena, Italy
| | - Luca Tabbì
- University Hospital Modena, 208968, Respiratory Diseases Unit, Modena, Italy
| | - Riccardo Fantini
- University Hospital Modena, 208968, Respiratory Diseases Unit, Modena, Italy
| | - Ivana Castaniere
- University Hospital Modena, 208968, Respiratory Diseases Unit, Modena, Italy.,University of Modena and Reggio Emilia, 9306, PhD Course in Clinical and Experimental Medicine, Modena, Italy
| | - Emanuela Biagioni
- Azienda Ospedaliera Universitaria Policlinico di Modena, 208968, Modena, Italy
| | - Cristina Mussini
- University Hospital Modena, 208968, Infectious Diseases Unit, Modena, Italy
| | - Massimo Girardis
- University of Modena and Reggio Emilia, 9306, Surgical, Medical and Dental Department of Morphological Sciences related to Transplants Oncology and Regenerative Medicine, Modena, Italy
| | - Enrico Clini
- University of Modena and Reggio Emilia, 9306, Medical and Surgical Sciences, Modena, Italy.,University Hospital Modena, 208968, Malattie Apparato Respiratorio, Modena, Italy;
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