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Iyer SH, Hinman JE, Warren T, Matthews SA, Simeone TA, Simeone KA. Altered ventilatory responses to hypercapnia-hypoxia challenges in a preclinical SUDEP model involve orexin neurons. Neurobiol Dis 2024; 199:106592. [PMID: 38971479 DOI: 10.1016/j.nbd.2024.106592] [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: 12/22/2023] [Revised: 06/25/2024] [Accepted: 07/02/2024] [Indexed: 07/08/2024] Open
Abstract
Failure to recover from repeated hypercapnia and hypoxemia (HH) challenges caused by severe GCS and postictal apneas may contribute to sudden unexpected death in epilepsy (SUDEP). Our previous studies found orexinergic dysfunction contributes to respiratory abnormalities in a preclinical model of SUDEP, Kcna1-/- mice. Here, we developed two gas challenges consisting of repeated HH exposures and used whole body plethysmography to determine whether Kcna1-/- mice have detrimental ventilatory responses. Kcna1-/- mice exhibited an elevated ventilatory response to a mild repeated hypercapnia-hypoxia (HH) challenge compared to WT. Moreover, 71% of Kcna1-/- mice failed to survive a severe repeated HH challenge, whereas all WT mice recovered. We next determined whether orexin was involved in these differences. Pretreating Kcna1-/- mice with a dual orexin receptor antagonist rescued the ventilatory response during the mild challenge and all subjects survived the severe challenge. In ex vivo extracellular recordings in the lateral hypothalamus of coronal brain slices, we found reducing pH either inhibits or stimulates putative orexin neurons similar to other chemosensitive neurons; however, a significantly greater percentage of putative orexin neurons from Kcna1-/-mice were stimulated and the magnitude of stimulation was increased resulting in augmentation of the calculated chemosensitivity index relative to WT. Collectively, our data suggest that increased chemosensitive activity of orexin neurons may be pathologic in the Kcna1-/- mouse model of SUDEP, and contribute to elevated ventilatory responses. Our preclinical data suggest that those at high risk for SUDEP may be more sensitive to HH challenges, whether induced by seizures or other means; and the depth and length of the HH exposure could dictate the probability of survival.
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Affiliation(s)
- Shruthi H Iyer
- Department of Pharmacology and Neuroscience, Creighton University School of Medicine, Omaha, NE 68178, USA
| | - Jillian E Hinman
- Department of Pharmacology and Neuroscience, Creighton University School of Medicine, Omaha, NE 68178, USA
| | - Ted Warren
- Department of Pharmacology and Neuroscience, Creighton University School of Medicine, Omaha, NE 68178, USA
| | - Stephanie A Matthews
- Department of Pharmacology and Neuroscience, Creighton University School of Medicine, Omaha, NE 68178, USA
| | - Timothy A Simeone
- Department of Pharmacology and Neuroscience, Creighton University School of Medicine, Omaha, NE 68178, USA
| | - Kristina A Simeone
- Department of Pharmacology and Neuroscience, Creighton University School of Medicine, Omaha, NE 68178, USA.
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McCormick G, Mohr NM, Ablordeppey E, Stephens RJ, Fuller BM, Roberts BW. Partial pressure of carbon dioxide/pH interaction and its association with mortality among patients mechanically ventilated in the emergency department. Am J Emerg Med 2024; 79:105-110. [PMID: 38417220 DOI: 10.1016/j.ajem.2024.02.025] [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: 10/10/2023] [Revised: 01/29/2024] [Accepted: 02/18/2024] [Indexed: 03/01/2024] Open
Abstract
OBJECTIVES There is currently conflicting data as to the effects of hypercapnia on clinical outcomes among mechanically ventilated patients in the emergency department (ED). These conflicting results may be explained by the degree of acidosis. We sought to test the hypothesis that hypercapnia is associated with increased in-hospital mortality and decreased ventilator-free days at lower pH, but associated with decreased in-hospital mortality and increased ventilator-free days at higher pH, among patients requiring mechanical ventilation in the emergency department (ED). METHODS Secondary analysis of patient level data from prior clinical trials and cohort studies that enrolled adult patients who required mechanical ventilation in the ED. Patients who had a documented blood gas while on mechanical ventilation in the ED were included in these analyses. The primary outcome was in-hospital mortality, and secondary outcome was ventilator-free days. Mixed-effects logistic, linear, and survival-time regression models were used to test if pH modified the association between partial pressure of carbon dioxide (pCO2) and outcome measures. RESULTS Of the 2348 subjects included, the median [interquartile range (IQR)] pCO2 was 43 (35-54) and pH was 7.31 (7.22-7.39). Overall, in-hospital mortality was 27%. We found pH modified the association between pCO2 and outcomes, with higher pCO2 associated with increased probability of in-hospital mortality when pH is below 7.00, and decreased probability of in-hospital mortality when pH is above 7.10. These results remained consistent across multiple sensitivity and subgroup analyses. A similar relationship was found with ventilator-free days. CONCLUSIONS Higher pCO2 is associated with decreased mortality and greater ventilator-free days when pH is >7.10; however, it is associated with increased mortality and fewer ventilator-free days when the pH is below 7.00. Targeting pCO2 based on pH in the ED may be a potential intervention target for future clinical trials to improve clinical outcomes.
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Affiliation(s)
- Gregory McCormick
- The Department of Emergency Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, NJ, United States of America
| | - Nicholas M Mohr
- Departments of Emergency Medicine and Anesthesia, Division of Critical Care Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA, United States of America
| | - Enyo Ablordeppey
- Departments of Emergency Medicine and Anesthesia, Division of Critical Care Medicine, Washington University School of Medicine, St. Louis, MO, United States of America
| | - Robert J Stephens
- Department of Medicine, Division of Critical Care, University of Maryland School of Medicine, United States of America
| | - Brian M Fuller
- Departments of Emergency Medicine and Anesthesia, Division of Critical Care Medicine, Washington University School of Medicine, St. Louis, MO, United States of America
| | - Brian W Roberts
- The Department of Emergency Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, NJ, United States of America.
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Campaña-Duel E, Ceccato A, Morales-Quinteros L, Camprubí-Rimblas M, Artigas A. Hypercapnia and its relationship with respiratory infections. Expert Rev Respir Med 2024; 18:41-47. [PMID: 38489161 DOI: 10.1080/17476348.2024.2331767] [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: 11/13/2023] [Accepted: 03/13/2024] [Indexed: 03/17/2024]
Abstract
INTRODUCTION Hypercapnia is developed in patients with acute and/or chronic respiratory conditions. Clinical data concerning hypercapnia and respiratory infections interaction is limited. AREAS COVERED Currently, the relationship between hypercapnia and respiratory infections remains unclear. In this review, we summarize studies on the effects of hypercapnia on models of pulmonary infections to clarify the role of elevated CO2 in these pulmonary pathologies. Hypercapnia affects different cell types in the alveoli, leading to changes in the immune response. In vitro studies show that hypercapnia downregulates the NF-κβ pathway, reduces inflammation and impairs epithelial wound healing. While in vivo models show a dual role between short- and long-term effects of hypercapnia on lung infection. However, it is still controversial whether the effects observed under hypercapnia are pH dependent or not. EXPERT OPINION The role of hypercapnia is still a controversial debate. Hypercapnia could play a beneficial role in mechanically ventilated models, by lowering the inflammation produced by the stretch condition. But it could be detrimental in infectious scenarios, causing phagocyte dysfunction and lack of infection control. Further data concerning hypercapnia on respiratory infections is needed to elucidate this interaction.
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Affiliation(s)
- Elena Campaña-Duel
- Critical care center, Parc Taulí Hospital Universitari. Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA). Universitat Autònoma de Barcelona, Sabadell, Spain
- CIBER of Respiratory Diseases (CIBERES), Institute of Health Carlos III, Madrid, Spain
| | - Adrian Ceccato
- Critical care center, Parc Taulí Hospital Universitari. Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA). Universitat Autònoma de Barcelona, Sabadell, Spain
- CIBER of Respiratory Diseases (CIBERES), Institute of Health Carlos III, Madrid, Spain
- Intensive care unit, Hospital Universitari Sagrat Cor, Grupo Quironsalud, Barcelona, Spain
| | - Luis Morales-Quinteros
- Critical care center, Parc Taulí Hospital Universitari. Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA). Universitat Autònoma de Barcelona, Sabadell, Spain
- CIBER of Respiratory Diseases (CIBERES), Institute of Health Carlos III, Madrid, Spain
- Servei de Medicina Intensiva, Hospital de la Santa Creu y Sant Pau, Barcelona, Spain
| | - Marta Camprubí-Rimblas
- Critical care center, Parc Taulí Hospital Universitari. Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA). Universitat Autònoma de Barcelona, Sabadell, Spain
- CIBER of Respiratory Diseases (CIBERES), Institute of Health Carlos III, Madrid, Spain
| | - Antonio Artigas
- Critical care center, Parc Taulí Hospital Universitari. Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA). Universitat Autònoma de Barcelona, Sabadell, Spain
- CIBER of Respiratory Diseases (CIBERES), Institute of Health Carlos III, Madrid, Spain
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Gałgańska H, Jarmuszkiewicz W, Gałgański Ł. Carbon dioxide and MAPK signalling: towards therapy for inflammation. Cell Commun Signal 2023; 21:280. [PMID: 37817178 PMCID: PMC10566067 DOI: 10.1186/s12964-023-01306-x] [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: 06/13/2023] [Accepted: 09/05/2023] [Indexed: 10/12/2023] Open
Abstract
Inflammation, although necessary to fight infections, becomes a threat when it exceeds the capability of the immune system to control it. In addition, inflammation is a cause and/or symptom of many different disorders, including metabolic, neurodegenerative, autoimmune and cardiovascular diseases. Comorbidities and advanced age are typical predictors of more severe cases of seasonal viral infection, with COVID-19 a clear example. The primary importance of mitogen-activated protein kinases (MAPKs) in the course of COVID-19 is evident in the mechanisms by which cells are infected with SARS-CoV-2; the cytokine storm that profoundly worsens a patient's condition; the pathogenesis of diseases, such as diabetes, obesity, and hypertension, that contribute to a worsened prognosis; and post-COVID-19 complications, such as brain fog and thrombosis. An increasing number of reports have revealed that MAPKs are regulated by carbon dioxide (CO2); hence, we reviewed the literature to identify associations between CO2 and MAPKs and possible therapeutic benefits resulting from the elevation of CO2 levels. CO2 regulates key processes leading to and resulting from inflammation, and the therapeutic effects of CO2 (or bicarbonate, HCO3-) have been documented in all of the abovementioned comorbidities and complications of COVID-19 in which MAPKs play roles. The overlapping MAPK and CO2 signalling pathways in the contexts of allergy, apoptosis and cell survival, pulmonary oedema (alveolar fluid resorption), and mechanical ventilation-induced responses in lungs and related to mitochondria are also discussed. Video Abstract.
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Affiliation(s)
- Hanna Gałgańska
- Faculty of Biology, Molecular Biology Techniques Laboratory, Adam Mickiewicz University in Poznan, Uniwersytetu Poznanskiego 6, 61-614, Poznan, Poland
| | - Wieslawa Jarmuszkiewicz
- Faculty of Biology, Department of Bioenergetics, Adam Mickiewicz University in Poznan, Institute of Molecular Biology and Biotechnology, Uniwersytetu Poznanskiego 6, 61-614, Poznan, Poland
| | - Łukasz Gałgański
- Faculty of Biology, Department of Bioenergetics, Adam Mickiewicz University in Poznan, Institute of Molecular Biology and Biotechnology, Uniwersytetu Poznanskiego 6, 61-614, Poznan, Poland.
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Marchiset A, Serazin V, Ben Hadj Salem O, Pichereau C, Lima Da Silva L, Au SM, Barbier C, Loubieres Y, Hayon J, Gross J, Outin H, Jamme M. Risk Factors of AKI in Acute Respiratory Distress Syndrome: A Time-Dependent Competing Risk Analysis on Severe COVID-19 Patients. Can J Kidney Health Dis 2023; 10:20543581221145073. [PMID: 36643941 PMCID: PMC9834615 DOI: 10.1177/20543581221145073] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Accepted: 11/08/2022] [Indexed: 01/11/2023] Open
Abstract
Introduction Acute kidney injury (AKI) is frequently observed in patients with COVID-19 admitted to intensive care units (ICUs). Observational studies suggest that cardiovascular comorbidities and mechanical ventilation (MV) are the most important risk factors for AKI. However, no studies have investigated the renal impact of longitudinal covariates such as drug treatments, biological variations, and/or MV parameters. Methods We performed a monocentric, prospective, longitudinal analysis to identify the dynamic risk factors for AKI in ICU patients with severe COVID-19. Results Seventy-seven patients were included in our study (median age: 63 [interquartile range, IQR: 53-73] years; 58 (75%) men). Acute kidney injury was detected in 28 (36.3%) patients and occurred at a median time of 3 [IQR: 2-6] days after ICU admission. Multivariate Cox cause-specific time-dependent analysis identified a history of hypertension (cause-specific hazard (CSH) = 2.46 [95% confidence interval, CI: 1.04-5.84]; P = .04), a high hemodynamic Sequential Organ Failure Assessment score (CSH = 1.63 [95% CI: 1.23-2.16]; P < .001), and elevated Paco2 (CSH = 1.2 [95%CI: 1.04-1.39] per 5 mm Hg increase in Pco2; P = .02) as independent risk factors for AKI. Concerning the MV parameters, positive end-expiratory pressure (CSH = 1.11 [95% CI: 1.01-1.23] per 1 cm H2O increase; P = .04) and the use of neuromuscular blockade (CSH = 2.96 [95% CI: 1.22-7.18]; P = .02) were associated with renal outcome only in univariate analysis but not after adjustment. Conclusion Acute kidney injury is frequent in patients with severe COVID-19 and is associated with a history of hypertension, the presence of hemodynamic failure, and increased Pco2. Further studies are necessary to evaluate the impact of hypercapnia on increasing the effects of ischemia, particularly in the most at-risk vascular situations.
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Affiliation(s)
- Antoine Marchiset
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Valerie Serazin
- Laboratoire de biologie, Centre
hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Omar Ben Hadj Salem
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Claire Pichereau
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Lionel Lima Da Silva
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Siu-Ming Au
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Christophe Barbier
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Yann Loubieres
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Jan Hayon
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Julia Gross
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Herve Outin
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France
| | - Matthieu Jamme
- Médecine intensive - Réanimation,
Centre hospitalier de Poissy - Saint Germain en Laye, Poissy, France,INSERM U1018, Centre de recherche en
épidémiologie et santé des populations, Equipe “Epidémiologie clinique”, Université
Paris Saclay, Villejuif, France,Réanimation et Unité de Soins Continus,
Hôpital privé de l’Ouest Parisien, Ramsay Générale de santé, Trappes, France,Matthieu Jamme, Réanimation et Unité de
Soins Continus, Hôpital privé de l’Ouest Parisien, Ramsay Générale de santé, 14
rue Castiglione del lago, Trappes 78190, France.
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6
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Ismaiel N, Whynot S, Geldenhuys L, Xu Z, Slutsky AS, Chappe V, Henzler D. Lung-Protective Ventilation Attenuates Mechanical Injury While Hypercapnia Attenuates Biological Injury in a Rat Model of Ventilator-Associated Lung Injury. Front Physiol 2022; 13:814968. [PMID: 35530505 PMCID: PMC9068936 DOI: 10.3389/fphys.2022.814968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Accepted: 03/21/2022] [Indexed: 12/30/2022] Open
Abstract
Background and Objective: Lung-protective mechanical ventilation is known to attenuate ventilator-associated lung injury (VALI), but often at the expense of hypoventilation and hypercapnia. It remains unclear whether the main mechanism by which VALI is attenuated is a product of limiting mechanical forces to the lung during ventilation, or a direct biological effect of hypercapnia. Methods: Acute lung injury (ALI) was induced in 60 anesthetized rats by the instillation of 1.25 M HCl into the lungs via tracheostomy. Ten rats each were randomly assigned to one of six experimental groups and ventilated for 4 h with: 1) Conventional HighVENormocapnia (high VT, high minute ventilation, normocapnia), 2) Conventional Normocapnia (high VT, normocapnia), 3) Protective Normocapnia (VT 8 ml/kg, high RR), 4) Conventional iCO2Hypercapnia (high VT, low RR, inhaled CO2), 5) Protective iCO2Hypercapnia (VT 8 ml/kg, high RR, added CO2), 6) Protective endogenous Hypercapnia (VT 8 ml/kg, low RR). Blood gasses, broncho-alveolar lavage fluid (BALF), and tissue specimens were collected and analyzed for histologic and biologic lung injury assessment. Results: Mild ALI was achieved in all groups characterized by a decreased mean PaO2/FiO2 ratio from 428 to 242 mmHg (p < 0.05), and an increased mean elastance from 2.46 to 4.32 cmH2O/L (p < 0.0001). There were no differences in gas exchange among groups. Wet-to-dry ratios and formation of hyaline membranes were significantly lower in low VT groups compared to conventional tidal volumes. Hypercapnia reduced diffuse alveolar damage and IL-6 levels in the BALF, which was also true when CO2 was added to conventional VT. In low VT groups, hypercapnia did not induce any further protective effect except increasing pulmonary IL-10 in the BALF. No differences in lung injury were observed when hypercapnia was induced by adding CO2 or decreasing minute ventilation, although permissive hypercapnia decreased the pH significantly and decreased liver histologic injury. Conclusion: Our findings suggest that low tidal volume ventilation likely attenuates VALI by limiting mechanical damage to the lung, while hypercapnia attenuates VALI by limiting pro-inflammatory and biochemical mechanisms of injury. When combined, both lung-protective ventilation and hypercapnia have the potential to exert an synergistic effect for the prevention of VALI.
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Affiliation(s)
- Nada Ismaiel
- Faculty of Medicine, Dalhousie University, Halifax, NS, Canada.,Department of Anesthesia, Faculty of Medicine, University of Toronto, Toronto, ON, Canada
| | - Sara Whynot
- Department of Anesthesia, Faculty of Medicine, Dalhousie University, Halifax, NS, Canada
| | - Laurette Geldenhuys
- Department of Pathology, Faculty of Medicine, Dalhousie University, Halifax, NS, Canada
| | - Zhaolin Xu
- Department of Pathology, Faculty of Medicine, Dalhousie University, Halifax, NS, Canada
| | | | - Valerie Chappe
- Department of Physiology and Biophysics, Faculty of Medicine, Dalhousie University, Halifax, NS, Canada
| | - Dietrich Henzler
- Department of Anesthesia, Faculty of Medicine, Dalhousie University, Halifax, NS, Canada.,Department of Anesthesiology, Medical Faculty, Ruhr University Bochum, Bochum, Germany
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Intermittent Exposure of Hypercapnia Suppresses Allograft Rejection via Induction of Treg Differentiation and Inhibition of Neutrophil Accumulation. Biomedicines 2022; 10:biomedicines10040836. [PMID: 35453586 PMCID: PMC9028437 DOI: 10.3390/biomedicines10040836] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/09/2022] [Accepted: 03/30/2022] [Indexed: 11/17/2022] Open
Abstract
Background: In the management of major burn wounds, allogeneic skin transplantation is a critical procedure to improve wound repair. Our previous works found that intermittent exposure to carbon dioxide leads to permissive hypercapnia (HCA) and prolongs skin allograft survival. However, the modulatory effects of HCA exposure on the immune system are not well understood. Objectives: Our purpose was to investigate how intermittent exposure to HCA can effectively reduce the immune reaction to allogeneic skin graft rejection. Methods: A fully major histocompatibility complex-incompatible skin transplant from BALB/c to C57BL/6 mice model was utilized. Immune cells from splenic and draining lymph nodes were analyzed by flow cytometry. Serum proinflammatory cytokines were analyzed by ELISA. Results: Serum levels of IFN-γ, IL-2, IL-6, and TNF-α were significantly decreased in the HCA group. Additionally, the percentage of CD8+ cells in draining lymph nodes was significantly lower in HCA than in the control group. Moreover, the generation rate of FoxP3+ regulatory T cells (Tregs) from spleen naïve CD4+ T cells was increased by intermittent exposure to carbon dioxide. The infiltrated neutrophils were also eliminated by HCA. Taken together, we concluded that intermittent hypercapnia exposure could effectively suppress skin rejection by stimulating Treg cell generation and suppressing immune reactions.
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8
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Almanza-Hurtado A, Polanco Guerra C, Martínez-Ávila MC, Borré-Naranjo D, Rodríguez-Yanez T, Dueñas-Castell C. Hypercapnia from Physiology to Practice. Int J Clin Pract 2022; 2022:2635616. [PMID: 36225533 PMCID: PMC9525762 DOI: 10.1155/2022/2635616] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/28/2022] [Accepted: 09/15/2022] [Indexed: 11/18/2022] Open
Abstract
Acute hypercapnic ventilatory failure is becoming more frequent in critically ill patients. Hypercapnia is the elevation in the partial pressure of carbon dioxide (PaCO2) above 45 mmHg in the bloodstream. The pathophysiological mechanisms of hypercapnia include the decrease in minute volume, an increase in dead space, or an increase in carbon dioxide (CO2) production per sec. They generate a compromise at the cardiovascular, cerebral, metabolic, and respiratory levels with a high burden of morbidity and mortality. It is essential to know the triggers to provide therapy directed at the primary cause and avoid possible complications.
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9
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Ehresman J, Cottrill E, Caplan JM, McDougall CG, Theodore N, Nyquist PA. Neuroprotective Role of Acidosis in Ischemia: Review of the Preclinical Evidence. Mol Neurobiol 2021; 58:6684-6696. [PMID: 34606050 DOI: 10.1007/s12035-021-02578-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 09/26/2021] [Indexed: 12/09/2022]
Abstract
Efforts to develop effective neuroprotective therapies for ischemic stroke have had little success to date. One promising approach to neuroprotection is ischemic postconditioning, which utilizes brief bouts of ischemia after acute ischemic stroke to elicit neuroprotection, although the mechanism is largely unknown. As the primary components of transient ischemia are local hypoxia and acidosis, and hypoxic postconditioning has had little success, it is possible that the acidosis component may be the primary driver. To address the evidence behind this, we performed a systematic review of preclinical studies focused on the neuroprotective role of transient acidosis after ischemia. Animal studies demonstrated that mild-to-moderate acidosis after ischemic events led to better functional neurologic outcomes with reduced infarct volumes, while severe acidosis often led to cerebral edema and worse functional outcomes. In vitro studies demonstrated that mild-to-moderate acidosis improves neuronal survival largely through two means: (1) inhibition of harmful superoxide formation in the excitotoxic pathway and (2) remodeling neuronal mitochondria to allow for efficient ATP production (i.e., oxidative phosphorylation), even in the absence of oxygen. Similar to the animal studies, acidotic postconditioning in humans would entail short cycles of carbon dioxide inhalation, which has already been demonstrated to be safe as part of a hypercapnic challenge when measuring cerebrovascular reactivity. Due to the preclinical efficacy of acidotic postconditioning, its relatively straightforward translation into humans, and the growing need for neuroprotective therapies, future preclinical studies should focus on filling the current knowledge gaps that are currently restricting the development of phase I/II clinical trials.
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Affiliation(s)
- Jeff Ehresman
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Phipps 416, 600 N. Wolfe St., Baltimore, MD, 21287, USA
| | - Ethan Cottrill
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Phipps 416, 600 N. Wolfe St., Baltimore, MD, 21287, USA
| | - Justin M Caplan
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Phipps 416, 600 N. Wolfe St., Baltimore, MD, 21287, USA
| | - Cameron G McDougall
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Phipps 416, 600 N. Wolfe St., Baltimore, MD, 21287, USA
| | - Nicholas Theodore
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Phipps 416, 600 N. Wolfe St., Baltimore, MD, 21287, USA
| | - Paul A Nyquist
- Department of Neurology, Johns Hopkins University School of Medicine, Phipps 416, 600 N. Wolfe St., Baltimore, MD, 21287, USA.
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Marongiu I, Spinelli E, Scotti E, Mazzucco A, Wang YM, Manesso L, Colussi G, Biancolilli O, Battistin M, Langer T, Roma F, Lopez G, Lonati C, Vaira V, Rosso L, Ferrero S, Gatti S, Zanella A, Pesenti A, Mauri T. Addition of 5% CO 2 to Inspiratory Gas Prevents Lung Injury in an Experimental Model of Pulmonary Artery Ligation. Am J Respir Crit Care Med 2021; 204:933-942. [PMID: 34252009 PMCID: PMC8534619 DOI: 10.1164/rccm.202101-0122oc] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Accepted: 07/12/2021] [Indexed: 11/19/2022] Open
Abstract
Rationale: Unilateral ligation of the pulmonary artery may induce lung injury through multiple mechanisms, which might be dampened by inhaled CO2. Objectives: This study aims to characterize bilateral lung injury owing to unilateral ligation of the pulmonary artery in healthy swine undergoing controlled mechanical ventilation and its prevention by 5% CO2 inhalation and to investigate relevant pathophysiological mechanisms. Methods: Sixteen healthy pigs were allocated to surgical ligation of the left pulmonary artery (ligation group), seven to surgical ligation of the left pulmonary artery and inhalation of 5% CO2 (ligation + FiCO2 5%), and six to no intervention (no ligation). Then, all animals received mechanical ventilation with Vt 10 ml/kg, positive end-expiratory pressure 5 cm H2O, respiratory rate 25 breaths/min, and FiO2 50% (±FiCO2 5%) for 48 hours or until development of severe lung injury. Measurements and Main Results: Histological, physiological, and quantitative computed tomography scan data were compared between groups to characterize lung injury. Electrical impedance tomography and immunohistochemistry analysis were performed in a subset of animals to explore mechanisms of injury. Animals from the ligation group developed bilateral lung injury as assessed by significantly higher histological score, larger increase in lung weight, poorer oxygenation, and worse respiratory mechanics compared with the ligation + FiCO2 5% group. In the ligation group, the right lung received a larger fraction of Vt and inflammation was more represented, whereas CO2 dampened both processes. Conclusions: Mechanical ventilation induces bilateral lung injury within 48 hours in healthy pigs undergoing left pulmonary artery ligation. Inhalation of 5% CO2 prevents injury, likely through decreased stress to the right lung and antiinflammatory effects.
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Affiliation(s)
| | | | | | | | - Yu-Mei Wang
- Department of Anesthesia, Critical Care and Emergency
- Department of Critical Care Medicine, Beijing Tiantan Hospital, Capital Medical University, Beijing, China; and
| | | | | | | | | | - Thomas Langer
- School of Medicine and Surgery, University of Milan–Bicocca, Niguarda Ca’ Granda Hospital, Milan, Italy
| | | | - Gianluca Lopez
- Department of Biomedical Surgical and Dental Sciences, University of Milan, Milan, Italy
- Division of Pathology, and
| | - Caterina Lonati
- Center for Preclinical Research, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Valentina Vaira
- Department of Pathophysiology and Transplantation
- Division of Pathology, and
| | | | - Stefano Ferrero
- Department of Biomedical Surgical and Dental Sciences, University of Milan, Milan, Italy
- Division of Pathology, and
| | - Stefano Gatti
- Center for Preclinical Research, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Alberto Zanella
- Department of Pathophysiology and Transplantation
- Department of Anesthesia, Critical Care and Emergency
| | - Antonio Pesenti
- Department of Pathophysiology and Transplantation
- Department of Anesthesia, Critical Care and Emergency
| | - Tommaso Mauri
- Department of Pathophysiology and Transplantation
- Department of Anesthesia, Critical Care and Emergency
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11
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Fogagnolo A, Montanaro F, Al-Husinat L, Turrini C, Rauseo M, Mirabella L, Ragazzi R, Ottaviani I, Cinnella G, Volta CA, Spadaro S. Management of Intraoperative Mechanical Ventilation to Prevent Postoperative Complications after General Anesthesia: A Narrative Review. J Clin Med 2021; 10:jcm10122656. [PMID: 34208699 PMCID: PMC8234365 DOI: 10.3390/jcm10122656] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/09/2021] [Accepted: 06/15/2021] [Indexed: 01/02/2023] Open
Abstract
Mechanical ventilation (MV) is still necessary in many surgical procedures; nonetheless, intraoperative MV is not free from harmful effects. Protective ventilation strategies, which include the combination of low tidal volume and adequate positive end expiratory pressure (PEEP) levels, are usually adopted to minimize the ventilation-induced lung injury and to avoid post-operative pulmonary complications (PPCs). Even so, volutrauma and atelectrauma may co-exist at different levels of tidal volume and PEEP, and therefore, the physiological response to the MV settings should be monitored in each patient. A personalized perioperative approach is gaining relevance in the field of intraoperative MV; in particular, many efforts have been made to individualize PEEP, giving more emphasis on physiological and functional status to the whole body. In this review, we summarized the latest findings about the optimization of PEEP and intraoperative MV in different surgical settings. Starting from a physiological point of view, we described how to approach the individualized MV and monitor the effects of MV on lung function.
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Affiliation(s)
- Alberto Fogagnolo
- Department of Translation Medicine and for Romagna, Section of Anesthesia and Intensive Care, University of Ferrara, 44121 Ferrara, Italy; (F.M.); (C.T.); (R.R.); (I.O.); (C.A.V.); (S.S.)
- Correspondence:
| | - Federica Montanaro
- Department of Translation Medicine and for Romagna, Section of Anesthesia and Intensive Care, University of Ferrara, 44121 Ferrara, Italy; (F.M.); (C.T.); (R.R.); (I.O.); (C.A.V.); (S.S.)
| | - Lou’i Al-Husinat
- Department of Clinical Sciences, Faculty of Medicine, Yarmouk University, Irbid 21163, Jordan;
| | - Cecilia Turrini
- Department of Translation Medicine and for Romagna, Section of Anesthesia and Intensive Care, University of Ferrara, 44121 Ferrara, Italy; (F.M.); (C.T.); (R.R.); (I.O.); (C.A.V.); (S.S.)
| | - Michela Rauseo
- Department of Anesthesia and Intensive Care, University of Foggia, 71122 Foggia, Italy; (M.R.); (L.M.); (G.C.)
| | - Lucia Mirabella
- Department of Anesthesia and Intensive Care, University of Foggia, 71122 Foggia, Italy; (M.R.); (L.M.); (G.C.)
| | - Riccardo Ragazzi
- Department of Translation Medicine and for Romagna, Section of Anesthesia and Intensive Care, University of Ferrara, 44121 Ferrara, Italy; (F.M.); (C.T.); (R.R.); (I.O.); (C.A.V.); (S.S.)
| | - Irene Ottaviani
- Department of Translation Medicine and for Romagna, Section of Anesthesia and Intensive Care, University of Ferrara, 44121 Ferrara, Italy; (F.M.); (C.T.); (R.R.); (I.O.); (C.A.V.); (S.S.)
| | - Gilda Cinnella
- Department of Anesthesia and Intensive Care, University of Foggia, 71122 Foggia, Italy; (M.R.); (L.M.); (G.C.)
| | - Carlo Alberto Volta
- Department of Translation Medicine and for Romagna, Section of Anesthesia and Intensive Care, University of Ferrara, 44121 Ferrara, Italy; (F.M.); (C.T.); (R.R.); (I.O.); (C.A.V.); (S.S.)
| | - Savino Spadaro
- Department of Translation Medicine and for Romagna, Section of Anesthesia and Intensive Care, University of Ferrara, 44121 Ferrara, Italy; (F.M.); (C.T.); (R.R.); (I.O.); (C.A.V.); (S.S.)
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12
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Hypercapnia Modulates the Activity of Adenosine A1 Receptors and mitoK +ATP-Channels in Rat Brain When Exposed to Intermittent Hypoxia. Neuromolecular Med 2021; 24:155-168. [PMID: 34115290 DOI: 10.1007/s12017-021-08672-0] [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: 11/15/2020] [Accepted: 06/05/2021] [Indexed: 10/21/2022]
Abstract
The mechanisms and signaling pathways of the neuroprotective effects of hypercapnia and its combination with hypoxia are not studied sufficiently. The study aims to test the hypothesis of the potentiating effect of hypercapnia on the systems of adaptation to hypoxia, directly associated with A1-adenosine receptors and mitochondrial ATP-dependent K+ -channels (mitoK+ATP-channels). We evaluated the relative number of A1-adenosine receptors and mitoK+ATP-channels in astrocytes obtained from male Wistar rats exposed to various respiratory conditions (15 times of hypoxia and/or hypercapnia). In addition, the relative number of these molecules in astrocytes was evaluated on an in vitro model of chemical hypoxia, as well as in the cerebral cortex after photothrombotic damage. This study indicates an increase in the relative number of A1-adenosine receptors in astrocytes and in cells next to the stroke region of the cerebral cortex in rats exposed to hypoxia and hypercapnic hypoxia, but not hypercapnia alone. Hypercapnia and hypoxia increase the relative number of mitoK+ATP-channels in astrocytes and in cells of the peri-infarct region of the cerebral cortex in rats. In an in vitro study, hypercapnia mitigates the effects of acute chemical hypoxia observed in astrocytes for A1-adenosine receptors and mitoK+ATP-channels. Hypercapnia, unlike hypoxia, does not affect the relative number of A1 receptors to adenosine. At the same time, both hypercapnia and hypoxia increase the relative number of mitoK+ATP-channels, which can potentiate their protective effects with combined exposure.
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13
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Masterson C, Horie S, McCarthy SD, Gonzalez H, Byrnes D, Brady J, Fandiño J, Laffey JG, O'Toole D. Hypercapnia in the critically ill: insights from the bench to the bedside. Interface Focus 2021; 11:20200032. [PMID: 33628425 PMCID: PMC7898152 DOI: 10.1098/rsfs.2020.0032] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/09/2020] [Indexed: 01/16/2023] Open
Abstract
Carbon dioxide (CO2) has long been considered, at best, a waste by-product of metabolism, and at worst, a toxic molecule with serious health consequences if physiological concentration is dysregulated. However, clinical observations have revealed that 'permissive' hypercapnia, the deliberate allowance of respiratory produced CO2 to remain in the patient, can have anti-inflammatory effects that may be beneficial in certain circumstances. In parallel, studies at the cell level have demonstrated the profound effect of CO2 on multiple diverse signalling pathways, be it the effect from CO2 itself specifically or from the associated acidosis it generates. At the whole organism level, it now appears likely that there are many biological sensing systems designed to respond to CO2 concentration and tailor respiratory and other responses to atmospheric or local levels. Animal models have been widely employed to study the changes in CO2 levels in various disease states and also to what extent permissive or even directly delivered CO2 can affect patient outcome. These findings have been advanced to the bedside at the same time that further clinical observations have been elucidated at the cell and animal level. Here we present a synopsis of the current understanding of how CO2 affects mammalian biological systems, with a particular emphasis on inflammatory pathways and diseases such as lung specific or systemic sepsis. We also explore some future directions and possibilities, such as direct control of blood CO2 levels, that could lead to improved clinical care in the future.
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Korang SK, Safi S, Feinberg J, Nielsen EE, Gluud C, Jakobsen JC. Bicarbonate for acute acidosis. Hippokratia 2021. [DOI: 10.1002/14651858.cd014371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Steven Kwasi Korang
- Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region of Denmark, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
| | - Sanam Safi
- Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region of Denmark, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
| | - Joshua Feinberg
- Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region of Denmark, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
| | - Emil Eik Nielsen
- Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region of Denmark, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
| | - Christian Gluud
- Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region of Denmark, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
- Cochrane Hepato-Biliary Group, Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region of Denmark, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
- Department of Regional Health Research, The Faculty of Health Sciences; University of Southern Denmark; Odense Denmark
| | - Janus C Jakobsen
- Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region of Denmark, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
- Cochrane Hepato-Biliary Group, Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region of Denmark, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
- Department of Regional Health Research, The Faculty of Health Sciences; University of Southern Denmark; Odense Denmark
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15
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Chand R, Swenson ER, Goldfarb DS. Sodium bicarbonate therapy for acute respiratory acidosis. Curr Opin Nephrol Hypertens 2021; 30:223-230. [PMID: 33395037 DOI: 10.1097/mnh.0000000000000687] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
PURPOSE OF REVIEW Respiratory acidosis is commonly present in patients with respiratory failure. The usual treatment of hypercapnia is to increase ventilation. During the recent surge of COVID-19, respiratory acidosis unresponsive to increased mechanical ventilatory support was common. Increasing mechanical ventilation comes at the expense of barotrauma and hemodynamic compromise from increasing positive end-expiratory pressures or minute ventilation. Treating acute respiratory acidemia with sodium bicarbonate remains controversial. RECENT FINDINGS There are no randomized controlled trials of administration of sodium bicarbonate for respiratory acidemia. A recent review concluded that alkali therapy for mixed respiratory and metabolic acidosis might be useful but was based on the conflicting and not conclusive literature regarding metabolic acidosis. This strategy should not be extrapolated to treatment of respiratory acidemia. Low tidal volume ventilation in acute lung injury (ALI) and acute respiratory distress syndrome (ARDS) has beneficial effects associated with permissive hypercapnia. Whether the putative benefits will be negated by administration of alkali is not known. Hypercapnic acidosis is well tolerated, with few adverse effects as long as tissue perfusion and oxygenation are maintained. SUMMARY There is a lack of clinical evidence that administration of sodium bicarbonate for respiratory acidosis has a net benefit; in fact, there are potential risks associated with it.
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Affiliation(s)
- Ranjeeta Chand
- Nephrology Division, New York University Langone Health and Nephrology Section, NY Harbor VA Healthcare System
| | - Erik R Swenson
- Pulmonary, Critical Care and Sleep Medicine Division, University of Washington, and VA Puget Sound Healthcare System, Seattle, Washington, USA
| | - David S Goldfarb
- Nephrology Division, New York University Langone Health and Nephrology Section, NY Harbor VA Healthcare System
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16
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Ischemia-reperfusion Injury in the Transplanted Lung: A Literature Review. Transplant Direct 2021; 7:e652. [PMID: 33437867 PMCID: PMC7793349 DOI: 10.1097/txd.0000000000001104] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 11/04/2020] [Accepted: 11/06/2020] [Indexed: 02/07/2023] Open
Abstract
Lung ischemia-reperfusion injury (LIRI) and primary graft dysfunction are leading causes of morbidity and mortality among lung transplant recipients. Although extensive research endeavors have been undertaken, few preventative and therapeutic treatments have emerged for clinical use. Novel strategies are still needed to improve outcomes after lung transplantation. In this review, we discuss the underlying mechanisms of transplanted LIRI, potential modifiable targets, current practices, and areas of ongoing investigation to reduce LIRI and primary graft dysfunction in lung transplant recipients.
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Tregub PP, Malinovskaya NA, Morgun AV, Osipova ED, Kulikov VP, Kuzovkov DA, Kovzelev PD. Hypercapnia potentiates HIF-1α activation in the brain of rats exposed to intermittent hypoxia. Respir Physiol Neurobiol 2020; 278:103442. [DOI: 10.1016/j.resp.2020.103442] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 03/19/2020] [Accepted: 04/06/2020] [Indexed: 12/30/2022]
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18
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Pospelov AS, Puskarjov M, Kaila K, Voipio J. Endogenous brain-sparing responses in brain pH and PO 2 in a rodent model of birth asphyxia. Acta Physiol (Oxf) 2020; 229:e13467. [PMID: 32174009 DOI: 10.1111/apha.13467] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 03/11/2020] [Indexed: 12/12/2022]
Abstract
AIM To study brain-sparing physiological responses in a rodent model of birth asphyxia which reproduces the asphyxia-defining systemic hypoxia and hypercapnia. METHODS Steady or intermittent asphyxia was induced for 15-45 minutes in anaesthetized 6- and 11-days old rats and neonatal guinea pigs using gases containing 5% or 9% O2 plus 20% CO2 (in N2 ). Hypoxia and hypercapnia were induced with low O2 and high CO2 respectively. Oxygen partial pressure (PO2 ) and pH were measured with microsensors within the brain and subcutaneous ("body") tissue. Blood lactate was measured after asphyxia. RESULTS Brain and body PO2 fell to apparent zero with little recovery during 5% O2 asphyxia and 5% or 9% O2 hypoxia, and increased more than twofold during 20% CO2 hypercapnia. Unlike body PO2 , brain PO2 recovered rapidly to control after a transient fall (rat), or was slightly higher than control (guinea pig) during 9% O2 asphyxia. Asphyxia (5% O2 ) induced a respiratory acidosis paralleled by a progressive metabolic (lact)acidosis that was much smaller within than outside the brain. Hypoxia (5% O2 ) produced a brain-confined alkalosis. Hypercapnia outlasting asphyxia suppressed pH recovery and prolonged the post-asphyxia PO2 overshoot. All pH changes were accompanied by consistent shifts in the blood-brain barrier potential. CONCLUSION Regardless of brain maturation stage, hypercapnia can restore brain PO2 and protect the brain against metabolic acidosis despite compromised oxygen availability during asphyxia. This effect extends to the recovery phase if normocapnia is restored slowly, and it is absent during hypoxia, demonstrating that exposure to hypoxia does not mimic asphyxia.
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Affiliation(s)
- Alexey S. Pospelov
- Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences University of Helsinki Helsinki Finland
| | - Martin Puskarjov
- Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences University of Helsinki Helsinki Finland
| | - Kai Kaila
- Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences University of Helsinki Helsinki Finland
- Neuroscience Center (HiLIFE) University of Helsinki Helsinki Finland
| | - Juha Voipio
- Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences University of Helsinki Helsinki Finland
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19
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Madotto F, Rezoagli E, McNicholas BA, Pham T, Slutsky AS, Bellani G, Laffey JG. Patterns and Impact of Arterial CO 2 Management in Patients With Acute Respiratory Distress Syndrome: Insights From the LUNG SAFE Study. Chest 2020; 158:1967-1982. [PMID: 32589951 DOI: 10.1016/j.chest.2020.05.605] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 04/08/2020] [Accepted: 05/29/2020] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Considerable variability exists regarding CO2 management in early ARDS, with the impact of arterial CO2 tension on management and outcomes poorly understood. RESEARCH QUESTION To determine the prevalence and impact of hypocapnia and hypercapnia on the management and outcomes of patients with early ARDS enrolled in the Large Observational Study to Understand the Global Impact of Severe Acute Respiratory Failure (LUNG SAFE) study, an international multicenter observational study. STUDY DESIGN AND METHODS Our primary objective was to examine the prevalence of day 1 and sustained (day 1 and 2) hypocapnia (Paco2 < 35 mm Hg), normocapnia (Paco2 35-45 mm Hg), and hypercapnia (Paco2 > 45 mm Hg) in patients with ARDS. Secondary objectives included elucidating the effect of CO2 tension on ventilatory management and examining the relationship with ARDS outcome. RESULTS Of 2,813 patients analyzed, 551 (19.6%; 95%CI, 18.1-21.1) were hypocapnic, 1,018 (36.2%; 95% CI, 34.4-38.0) were normocapnic, and 1,214 (43.2%; 95% CI, 41.3-45.0) were hypercapnic, on day 1. Sustained hypocapnia was seen in 252 (9.3%; 95% CI, 8.2-10.4), sustained normocapnia in 544 (19.3%; 95% CI, 17.9-20.8), and sustained hypercapnia in 654 (24.1%; 95% CI, 22.5-25.7) patients. Hypocapnia was more frequent and severe in patients receiving noninvasive ventilation but also was observed in patients on controlled mechanical ventilation. Sustained hypocapnia was more frequent in middle-income countries, whereas sustained hypercapnia was more frequent in Europe. ARDS severity profile was highest in sustained hypercapnia, and these patients received more protective ventilation. No independent association was seen between arterial CO2 and outcome. In propensity-matched analyses, the hospital mortality rate was 36% in both sustained normocapnic and hypercapnic patients (P = 1.0). ICU mortality was higher in patients with mild to moderate ARDS receiving sustained hypocapnia (38.1%) compared with normocapnia (27.1%). INTERPRETATION No evidence was found for benefit or harm with hypercapnia. Of concern, ICU mortality was higher with sustained hypocapnia in mild to moderate ARDS.
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Affiliation(s)
- Fabiana Madotto
- IRCCS MultiMedica, Value-based healthcare unit, Sesto San Giovanni (Milan), Italy
| | - Emanuele Rezoagli
- School of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy; Department of Emergency and Intensive Care, San Gerardo Hospital, Monza, Italy
| | - Bairbre A McNicholas
- School of Medicine, National University of Ireland Galway, Galway, Ireland; Department of Anaesthesia and Intensive Care Medicine, Galway University Hospitals, Galway, Ireland
| | - Tài Pham
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada; Service de médecine intensive-réanimation, AP-HP, Hôpital de Bicêtre, Hôpitaux Universitaires Paris-Saclay, Le Kremlin-Bicêtre, France; Keenan Research Center at the Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada
| | - Arthur S Slutsky
- Keenan Research Center at the Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada; Interdepartmental Division of Critical Care Medicine, and the Department of Medicine, University of Toronto, Toronto, ON, Canada
| | - Giacomo Bellani
- School of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy; Department of Emergency and Intensive Care, San Gerardo Hospital, Monza, Italy
| | - John G Laffey
- School of Medicine, National University of Ireland Galway, Galway, Ireland; Department of Anaesthesia and Intensive Care Medicine, Galway University Hospitals, Galway, Ireland; Lung Biology Group, Regenerative Medicine Institute (REMEDI) at CÚRAM Centre for Research in Medical Devices, Biomedical Sciences Building, National University of Ireland Galway, Galway, Ireland.
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McGuigan PJ, Shankar-Hari M, Harrison DA, Laffey JG, McAuley DF. The interaction between arterial oxygenation and carbon dioxide and hospital mortality following out of hospital cardiac arrest: a cohort study. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2020; 24:336. [PMID: 32532312 PMCID: PMC7290139 DOI: 10.1186/s13054-020-03039-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 05/27/2020] [Indexed: 02/04/2023]
Abstract
BACKGROUND Outcomes following out of hospital cardiac arrest (OHCA) are poor. The optimal arterial oxygen and carbon dioxide (PaCO2) levels for managing patients following OHCA are unknown. We hypothesized that abnormalities in arterial oxygenation (PaO2/FiO2 ratio or PaO2) and PaCO2 would be associated with hospital mortality following OHCA. We hypothesized that PaCO2 would significantly modify the oxygenation-mortality relationship. METHODS This was an observational cohort study using data from OHCA survivors admitted to adult critical care units in England, Wales and Northern Ireland from 2011 to 2018. Logistic regression analyses were performed to assess the relationship between hospital mortality and oxygenation and PaCO2. RESULTS The analysis included 23,625 patients. In comparison with patients with a PaO2/FiO2 > 300 mmHg, those with a PaO2/FiO2 ≤ 100 mmHg had higher mortality (adjusted OR, 1.79; 95% CI, 1.48 to 2.15; P < 0.001). In comparison to hyperoxemia (PaO2 > 100 mmHg), patients with hypoxemia (PaO2 < 60 mmHg) had higher mortality (adjusted OR, 1.34; 95% CI, 1.10 to 1.65; P = 0.004). In comparison with normocapnia, hypercapnia was associated with lower mortality. Hypocapnia (PaCO2 ≤ 35 mmHg) was associated with higher mortality (adjusted OR, 1.91; 95% CI, 1.63 to 2.24; P < 0.001). PaCO2 modified the PaO2/FiO2-mortality and PaO2-mortality relationships, though these relationships were complex. Patients who were both hyperoxic and hypercapnic had the lowest mortality. CONCLUSIONS Low PaO2/FiO2 ratio, hypoxemia and hypocapnia are associated with higher mortality following OHCA. PaCO2 modifies the relationship between oxygenation and mortality following OHCA; future studies examining this interaction are required.
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Affiliation(s)
- Peter J McGuigan
- Regional Intensive Care Unit, Royal Victoria Hospital, Belfast, BT12 6BA, UK.
| | - Manu Shankar-Hari
- Guy's and St Thomas' NHS Foundation Trust, ICU support Offices, St Thomas' Hospital, 1st Floor, East Wing, London, SE1 7EH, UK.,School of Immunology & Microbial Sciences, Kings College London, London, SE1 9RT, UK.,Intensive Care National Audit & Research Centre, Napier House, 24 High Holborn, London, WC1V 6AZ, UK
| | - David A Harrison
- Intensive Care National Audit & Research Centre, Napier House, 24 High Holborn, London, WC1V 6AZ, UK
| | - John G Laffey
- Anaesthesia and Intensive Care Medicine, School of Medicine, Regenerative Medicine Institute (REMEDI), CÚRAM Centre for Research in Medical Devices National University of Ireland Galway, Galway, Ireland.,Department of Anaesthesia, Galway University Hospitals, Galway, Ireland
| | - Danny F McAuley
- Regional Intensive Care Unit, Royal Victoria Hospital, Belfast, BT12 6BA, UK.,Centre for Experimental Medicine, Wellcome-Wolfson Institute for Experimental Medicine, Belfast, BT9 7AE, UK
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Lee JH, Kim Y, Mun J, Lee J, Ko S. Effects of hypercarbia on arterial oxygenation during one-lung ventilation: prospective randomized crossover study. Korean J Anesthesiol 2020; 73:534-541. [PMID: 32460465 PMCID: PMC7714622 DOI: 10.4097/kja.19445] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 05/27/2020] [Indexed: 11/12/2022] Open
Abstract
Background This study aimed to evaluate the effects of hypercarbia on arterial oxygenation during one-lung ventilation (OLV). Methods Fifty adult patients undergoing elective video-assisted thoracoscopic lobectomy or pneumonectomy were enrolled. Group I patients (n = 25) were first maintained at normocarbia (PaCO2: 38–42 mmHg) for 30 min and then at hypercarbia (45–50 mmHg). In Group II patients (n = 25), PaCO2 was maintained in the reverse order. Arterial oxygen partial pressure (PaO2), respiratory variables, hemodynamic variables, and hemoglobin concentration were compared during normocarbia and hypercarbia. Arterial O2 content and O2 delivery were calculated. Results PaO2 values during normocarbia and hypercarbia were 66.5 ± 10.6 and 79.7 ± 17.3 mmHg, respectively (mean difference: 13.2 mmHg, 95% CI for difference of means: 17.0 to 9.3, P < 0.001). SaO2 values during normocarbia and hypercarbia were 92.5 ± 4.8% and 94.3 ± 3.1% (P = 0.009), respectively. Static compliance of the lung (33.0 ± 5.4 vs. 30.4 ± 5.3 ml/cmH2O, P < 0.001), arterial O2 content (15.4 ± 1.4 vs. 14.9 ± 1.5 ml/dl, P < 0.001) and O2 delivery (69.9 ± 18.4 vs. 65.1 ± 18.1 ml/min, P < 0.001) were significantly higher during hypercarbia than during normocarbia. Conclusions Hypercarbia increases PaO2 and O2 carrying capacity and improves pulmonary mechanics during OLV, suggesting that it may help manage oxygenation during OLV. Therefore, permissive hypercarbia may be a simple and valuable modality to manage arterial oxygenation during OLV.
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Affiliation(s)
- Jun Ho Lee
- Department of Anesthesiology and Pain Medicine, Jeonbuk National University Medical School and Hospital, Jeonju, Korea
| | - Yesull Kim
- Department of Anesthesiology and Pain Medicine, Jeonbuk National University Medical School and Hospital, Jeonju, Korea
| | - Juhan Mun
- Department of Anesthesiology and Pain Medicine, Jeonbuk National University Medical School and Hospital, Jeonju, Korea
| | - Joseph Lee
- Department of Anesthesiology and Pain Medicine, Jeonbuk National University Medical School and Hospital, Jeonju, Korea
| | - Seonghoon Ko
- Department of Anesthesiology and Pain Medicine, Jeonbuk National University Medical School and Hospital, Jeonju, Korea
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22
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Ding H, Liu X, Li X, Wen M, Li Y, Han Y, Huang L, Liu M, Zeng H. Hypercapnia exacerbates the disruption of the blood‑brain barrier by inducing interleukin‑1β overproduction in the blood of hypoxemic adult rats. Int J Mol Med 2020; 46:762-772. [PMID: 32626911 PMCID: PMC7307827 DOI: 10.3892/ijmm.2020.4604] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Accepted: 04/27/2020] [Indexed: 12/28/2022] Open
Abstract
Refractory hypoxemia is the main symptom of acute respiratory distress syndrome (ARDS). Low tidal volume ventilation is routinely applied in clinical practice to correct hypoxemia, which aims to prevent ventilator‑induced lung injury. However, this ventilation strategy inevitably leads to hypercapnia. Our previous study demonstrated that hypercapnia aggravated cognitive impairment in hypoxemic rats; however, the underlying mechanism remains unclear. The aim of the present study was to investigate whether hypercapnia exacerbates the blood‑brain barrier (BBB) disruption through inducing interleukin (IL)‑1β overproduction in the blood of hypoxemic rats. The BBB permeability in a rat model of hypercapnia/hypoxemia was evaluated. The levels of IL‑1β in the blood of rats and human whole‑blood cultures were assessed. The expression of IL‑1 receptor 1 (IL‑1R1), phosphorylated IL‑1R1‑associated kinase (p‑IRAK‑1) and tight junctional proteins in cerebral vascular endothelial cells was examined in vitro and in vivo. In addition, IL‑1Ra, an IL‑1 receptor antagonist, was used to determine whether hypercapnia affects tight junctional protein expression in hypoxic cerebral vascular endothelial cells through inducing IL‑1β overproduction. It was observed that hypercapnia alone did not disrupt the BBB, but aggravated the damage to the BBB integrity in hypoxemic rats. Hypercapnia increased IL‑1β expression in the blood of hypoxemic rats as well as in hypoxic human whole‑blood cultures. IL‑1R1 and p‑IRAK‑1 expression was increased, while that of tight junctional proteins was reduced by hypercapnia in hypoxemic cerebral vascular endothelial cells in vitro and in vivo. Additionally, the expression of tight junctional proteins was markedly increased following treatment with IL‑1Ra. These results suggest that hypercapnia‑induced IL‑1β overproduction in the hypoxemic blood may decrease tight junctional protein expression in cerebrovascular endothelial cells via the IL‑1R1/p‑IRAK‑1 pathway, further disrupting BBB integrity, and eventually resulting in increased BBB permeability.
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Affiliation(s)
- Hongguang Ding
- Department of Emergency and Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, P.R. China
| | - Xinqiang Liu
- Department of Emergency and Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, P.R. China
| | - Xusheng Li
- Department of Emergency and Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, P.R. China
| | - Miaoyun Wen
- Department of Emergency and Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, P.R. China
| | - Ya Li
- School of Medicine, South China University of Technology, Guangzhou, Guangdong 510006, P.R. China
| | - Yongli Han
- Department of Emergency and Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, P.R. China
| | - Linqiang Huang
- Department of Emergency and Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, P.R. China
| | - Mengting Liu
- School of Medicine, South China University of Technology, Guangzhou, Guangdong 510006, P.R. China
| | - Hongke Zeng
- Department of Emergency and Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, P.R. China
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Pre-Treatment with Ten-Minute Carbon Dioxide Inhalation Prevents Lipopolysaccharide-Induced Lung Injury in Mice via Down-Regulation of Toll-Like Receptor 4 Expression. Int J Mol Sci 2019; 20:ijms20246293. [PMID: 31847115 PMCID: PMC6940754 DOI: 10.3390/ijms20246293] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 12/07/2019] [Accepted: 12/11/2019] [Indexed: 12/29/2022] Open
Abstract
Various animal studies have shown beneficial effects of hypercapnia in lung injury. However, in patients with acute respiratory distress syndrome (ARDS), there is controversial information regarding the effect of hypercapnia on outcomes. The duration of carbon dioxide inhalation may be the key to the protective effect of hypercapnia. We investigated the effect of pre-treatment with inhaled carbon dioxide on lipopolysaccharide (LPS)-induced lung injury in mice. C57BL/6 mice were randomly divided into a control group or an LPS group. Each LPS group received intratracheal LPS (2 mg/kg); the LPS groups were exposed to hypercapnia (5% carbon dioxide) for 10 min or 60 min before LPS. Bronchoalveolar lavage fluid (BALF) and lung tissues were collected to evaluate the degree of lung injury. LPS significantly increased the ratio of lung weight to body weight; concentrations of BALF protein, tumor necrosis factor-α, and CXCL2; protein carbonyls; neutrophil infiltration; and lung injury score. LPS induced the degradation of the inhibitor of nuclear factor-κB-α (IκB-α) and nuclear translocation of NF-κB. LPS increased the surface protein expression of toll-like receptor 4 (TLR4). Pre-treatment with inhaled carbon dioxide for 10 min, but not for 60 min, inhibited LPS-induced pulmonary edema, inflammation, oxidative stress, lung injury, and TLR4 surface expression, and, accordingly, reduced NF-κB signaling. In summary, our data demonstrated that pre-treatment with 10-min carbon dioxide inhalation can ameliorate LPS-induced lung injury. The protective effect may be associated with down-regulation of the surface expression of TLR4 in the lungs.
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Xia W, Li G, Pan Z, Zhou Q. Hypercapnia attenuates ventilator-induced lung injury through vagus nerve activation. Acta Cir Bras 2019; 34:e201900902. [PMID: 31778524 PMCID: PMC6887097 DOI: 10.1590/s0102-865020190090000002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Accepted: 08/10/2019] [Indexed: 11/21/2022] Open
Abstract
Purpose: To investigate the role of vagus nerve activation in the protective effects
of hypercapnia in ventilator-induced lung injury (VILI) rats. Methods: Male Sprague-Dawley rats were randomized to either high-tidal volume or
low-tidal volume ventilation (control) and monitored for 4h. The high-tidal
volume group was further divided into either a vagotomy or sham-operated
group and each surgery group was further divided into two subgroups:
normocapnia and hypercapnia. Injuries were assessed hourly through
hemodynamics, respiratory mechanics and gas exchange. Protein concentration,
cell count and cytokines (TNF-α and IL-8) in bronchoalveolar lavage fluid
(BALF), lung wet-to-dry weight and pathological changes were examined. Vagus
nerve activity was recorded for 1h. Results: Compared to the control group, injurious ventilation resulted in a decrease
in PaO2/FiO2 and greater lung static compliance, MPO
activity, enhanced BALF cytokines, protein concentration, cell count, and
histology injury score. Conversely, hypercapnia significantly improved VILI
by decreasing the above injury parameters. However, vagotomy abolished the
protective effect of hypercapnia on VILI. In addition, hypercapnia enhanced
efferent vagus nerve activity compared to normocapnia. Conclusion: These results indicate that the vagus nerve plays an important role in
mediating the anti-inflammatory effect of hypercapnia on VILI.
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Affiliation(s)
- Wenfang Xia
- MD, Department of Critical Care Medicine, Renmin Hospital of Wuhan University, Wuhan, Hubei, China. Conception of the study, analysis of data, manuscript writing, critical revision
| | - Guang Li
- MD, Department of Critical Care Medicine, Renmin Hospital of Wuhan University, Wuhan, Hubei, China. Conception of the study, analysis of data, manuscript writing, critical revision
| | - Zhou Pan
- MD, Department of Critical Care Medicine, Renmin Hospital of Wuhan University, Wuhan, Hubei, China. Technical procedures, critical revision
| | - Qingshan Zhou
- MD, Department of Critical Care Medicine, Renmin Hospital of Wuhan University, Wuhan, Hubei, China. Conception of the study, analysis of data, critical revision
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Association Between PaCO2 and Survival to Hospital Discharge Among Patients Diagnosed With Sepsis in the Emergency Department-Is PaCO2 a Predictive Parameter for Hospital Discharge? Crit Care Med 2019; 46:e718. [PMID: 29912115 DOI: 10.1097/ccm.0000000000003062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Morales-Quinteros L, Camprubí-Rimblas M, Bringué J, Bos LD, Schultz MJ, Artigas A. The role of hypercapnia in acute respiratory failure. Intensive Care Med Exp 2019; 7:39. [PMID: 31346806 PMCID: PMC6658637 DOI: 10.1186/s40635-019-0239-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 03/07/2019] [Indexed: 12/16/2022] Open
Abstract
The biological effects and physiological consequences of hypercapnia are increasingly understood. The literature on hypercapnia is confusing, and at times contradictory. On the one hand, it may have protective effects through attenuation of pulmonary inflammation and oxidative stress. On the other hand, it may also have deleterious effects through inhibition of alveolar wound repair, reabsorption of alveolar fluid, and alveolar cell proliferation. Besides, hypercapnia has meaningful effects on lung physiology such as airway resistance, lung oxygenation, diaphragm function, and pulmonary vascular tree. In acute respiratory distress syndrome, lung-protective ventilation strategies using low tidal volume and low airway pressure are strongly advocated as these have strong potential to improve outcome. These strategies may come at a price of hypercapnia and hypercapnic acidosis. One approach is to accept it (permissive hypercapnia); another approach is to treat it through extracorporeal means. At present, it remains uncertain what the best approach is.
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Affiliation(s)
- Luis Morales-Quinteros
- Intensive Care Unit, Hospital Universitario Sagrado Corazón, Carrer de Viladomat, 288, 08029, Barcelona, Spain.
| | - Marta Camprubí-Rimblas
- Department of Medicine, Universitat Autònoma de Barcelona, Bellatera, Spain.,Institut d'Investigació i Innovació Parc Taulí (I3PT), Sabadell, Spain
| | - Josep Bringué
- Department of Medicine, Universitat Autònoma de Barcelona, Bellatera, Spain.,Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Lieuwe D Bos
- Department of Intensive Care, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands.,Respiratory Medicine, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands.,Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands
| | - Marcus J Schultz
- Department of Intensive Care, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands.,Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands.,Mahidol Oxford Tropical Medicine Research Unit (MORU), Mahidol University, Bangkok, Thailand
| | - Antonio Artigas
- Intensive Care Unit, Hospital Universitario Sagrado Corazón, Carrer de Viladomat, 288, 08029, Barcelona, Spain.,Department of Medicine, Universitat Autònoma de Barcelona, Bellatera, Spain.,Critical Care Center, Corporació Sanitària I Universitària Parc Taulí, Sabadell, Spain.,Institut d'Investigació i Innovació Parc Taulí (I3PT), Sabadell, Spain.,Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
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27
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Hypercapnic hypoxia as a potential means to extend life expectancy and improve physiological activity in mice. Biogerontology 2019; 20:677-686. [DOI: 10.1007/s10522-019-09821-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 07/10/2019] [Indexed: 01/09/2023]
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28
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Xia X, Peng Y, Lei D, Chen W. Hypercapnia downregulates hypoxia‐induced lysyl oxidase expression in pulmonary artery smooth muscle cells via inhibiting transforming growth factor β1signalling. Cell Biochem Funct 2019; 37:193-202. [PMID: 30917408 DOI: 10.1002/cbf.3390] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 02/17/2019] [Accepted: 03/01/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Xiao‐dong Xia
- Department of Respiratory MedicineThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University Wenzhou China
| | - Yan‐ping Peng
- Department of Respiratory MedicineThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University Wenzhou China
| | - Dan Lei
- Department of Respiratory MedicineThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University Wenzhou China
| | - Wei‐qian Chen
- Department of Respiratory MedicineThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University Wenzhou China
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29
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Somogyi RB, Vesely AE, Preiss D, Prisman E, Volgyesi G, Azami T, Iscoe S, Fisher JA, Sasano H. Precise Control of End-tidal Carbon Dioxide Levels Using Sequential Rebreathing Circuits. Anaesth Intensive Care 2019; 33:726-32. [PMID: 16398376 DOI: 10.1177/0310057x0503300604] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Anaesthesiologists have traditionally been consulted to help design breathing circuits to attain and maintain target end-tidal carbon dioxide (PETCO2). The methodology has recently been simplified by breathing circuits that sequentially deliver fresh gas (not containing carbon dioxide (CO2)) and reserve gas (containing CO2). Our aim was to determine the roles of fresh gas flow, reserve gas PCO2 and minute ventilation in the determination of PETCO2. We first used a computer model of a non-rebreathing sequential breathing circuit to determine these relationships. We then tested our model by monitoring PETCO2 in human volunteers who increased their minute ventilation from resting to five times resting levels. The optimal settings to maintain PETCO2 independently of minute ventilation are 1) fresh gas flow equal to minute ventilation minus anatomical deadspace ventilation, and 2) reserve gas PCO2 equal to alveolar PCO2. We provide an equation to assist in identifying gas settings to attain a target PCO2. The ability to precisely attain and maintain a target PCO2 (isocapnia) using a sequential gas delivery circuit has multiple therapeutic and scientific applications.
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Affiliation(s)
- R B Somogyi
- University Health Network, Toronto General Hospital, University of Toronto, Department of Physiology, Queen's University, Kingston, Canada
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30
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Hope Kilgannon J, Hunter BR, Puskarich MA, Shea L, Fuller BM, Jones C, Donnino M, Kline JA, Jones AE, Shapiro NI, Abella BS, Trzeciak S, Roberts BW. Partial pressure of arterial carbon dioxide after resuscitation from cardiac arrest and neurological outcome: A prospective multi-center protocol-directed cohort study. Resuscitation 2018; 135:212-220. [PMID: 30452939 DOI: 10.1016/j.resuscitation.2018.11.015] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 09/21/2018] [Accepted: 11/13/2018] [Indexed: 12/23/2022]
Abstract
AIMS Partial pressure of arterial carbon dioxide (PaCO2) is a regulator of cerebral blood flow after brain injury. We sought to test the association between PaCO2 after resuscitation from cardiac arrest and neurological outcome. METHODS A prospective protocol-directed cohort study across six hospitals. INCLUSION CRITERIA age ≥18, non-traumatic cardiac arrest, mechanically ventilated after return of spontaneous circulation (ROSC), and receipt of targeted temperature management. Per protocol, PaCO2 was measured by arterial blood gas analyses at one and six hours after ROSC. We determined the mean PaCO2 over this initial six hours after ROSC. The primary outcome was good neurological function at hospital discharge, defined a priori as a modified Rankin Scale ≤3. Multivariable Poisson regression analysis was used to test the association between PaCO2 and neurological outcome. RESULTS Of the 280 patients included, the median (interquartile range) PaCO2 was 44 (37-52) mmHg and 30% had good neurological function. We found mean PaCO2 had a quadratic (inverted "U" shaped) association with good neurological outcome, with a mean PaCO2 of 68 mmHg having the highest predictive probability of good neurological outcome, and worse neurological outcome at higher and lower PaCO2. Presence of metabolic acidosis attenuated the association between PaCO2 and good neurological outcome, with a PaCO2 of 51 mmHg having the highest predictive probability of good neurological outcome among patients with metabolic acidosis. CONCLUSION PaCO2 has a "U" shaped association with neurological outcome, with mild to moderate hypercapnia having the highest probability of good neurological outcome.
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Affiliation(s)
- J Hope Kilgannon
- The Department of Emergency Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, NJ, United States
| | - Benton R Hunter
- The Department of Emergency Medicine, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Michael A Puskarich
- The Department of Emergency Medicine, University of Mississippi Medical Center, Jackson, MS, United States
| | - Lisa Shea
- The Department of Medicine, Division of Critical Care Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, NJ, United States
| | - Brian M Fuller
- Departments of Emergency Medicine and Anesthesiology, Division of Critical Care Medicine, Washington University School of Medicine, St. Louis, MO, United States
| | - Christopher Jones
- The Department of Emergency Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, NJ, United States
| | - Michael Donnino
- The Department of Emergency Medicine, Beth Israel Deaconess Medical Center, Boston, MA, United States
| | - Jeffrey A Kline
- The Department of Emergency Medicine, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Alan E Jones
- The Department of Emergency Medicine, University of Mississippi Medical Center, Jackson, MS, United States
| | - Nathan I Shapiro
- The Department of Emergency Medicine, Beth Israel Deaconess Medical Center, Boston, MA, United States
| | - Benjamin S Abella
- The Center for Resuscitation Science and Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Stephen Trzeciak
- The Department of Emergency Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, NJ, United States; The Department of Medicine, Division of Critical Care Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, NJ, United States
| | - Brian W Roberts
- The Department of Emergency Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, NJ, United States.
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Effects of hypercapnia in sepsis: protocol for a systematic review of clinical and preclinical data. Syst Rev 2018; 7:171. [PMID: 30348218 PMCID: PMC6198495 DOI: 10.1186/s13643-018-0840-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 10/09/2018] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Respiratory failure requiring mechanical ventilation is a common manifestation of end-organ damage among patients with sepsis and has a high morbidity and mortality rate, as well as substantial associated treatment costs. Considering the burden of this condition, there is great need to identify novel, pragmatic therapies to improve outcomes in this population. Hypercapnia has shown benefits in several different ex vivo and in vivo models of lung injury. However, it is currently unclear if hypercapnia can confer clinical benefit among patients with sepsis. The objective of this systematic review is to collate the biomedical literature of preclinical and clinical studies testing the effects of higher PaCO2 levels in the setting of sepsis. METHODS We will perform a qualitative systematic review of preclinical and clinical studies evaluating the effects of hypercapnia in sepsis. We will search CENTRAL, PubMed, CINAHL, and EMBASE using a comprehensive strategy. We will screen the reference lists of the articles we select for inclusion to identify additional studies for potential inclusion. Two independent reviewers will review all search results. Upon inclusion of articles, we will extract data using a standardized form. We will use tables to describe the study type, population included, exposure and control groups, outcome measures, and effects of exposure on outcome measures compared to controls. DISCUSSION This systematic review aims to synthesize the world's literature on the effects of hypercapnia in the setting of sepsis. We expect this systematic review will find that majority of the studies will demonstrate a potential benefit of higher PaCO2 levels in sepsis. The results of this systematic review will contribute to the understanding of the effects of hypercapnia in the setting of sepsis and promote future research of PaCO2 management in mechanically ventilated patients with sepsis. SYSTEMATIC REVIEW REGISTRATION The systematic review is registered in the PROSPERO international prospective register of systematic review (PROSPERO # CRD42018086703 ).
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Roberts BW, Mohr NM, Ablordeppey E, Drewry AM, Ferguson IT, Trzeciak S, Kollef MH, Fuller BM. Association Between Partial Pressure of Arterial Carbon Dioxide and Survival to Hospital Discharge Among Patients Diagnosed With Sepsis in the Emergency Department. Crit Care Med 2018; 46:e213-e220. [PMID: 29261567 PMCID: PMC5825256 DOI: 10.1097/ccm.0000000000002918] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE The objective of this study was to test the association between the partial pressure of arterial carbon dioxide and survival to hospital discharge among mechanically ventilated patients diagnosed with sepsis in the emergency department. DESIGN Retrospective cohort study of a single center trial registry. SETTING Academic medical center. PATIENTS Mechanically ventilated emergency department patients. INCLUSION CRITERIA age 18 years and older, diagnosed with sepsis in the emergency department, and mechanical ventilation initiated in the emergency department. INTERVENTIONS Arterial blood gases obtained after initiation of mechanical ventilation were analyzed. The primary outcome was survival to hospital discharge. We tested the association between partial pressure of arterial carbon dioxide and survival using multivariable logistic regression adjusting for potential confounders. Sensitivity analyses, including propensity score matching were also performed. MEASUREMENTS AND MAIN RESULTS Six hundred subjects were included, and 429 (72%) survived to hospital discharge. The median (interquartile range) partial pressure of arterial carbon dioxide was 42 (34-53) mm Hg for the entire cohort and 44 (35-57) and 39 (31-45) mm Hg among survivors and nonsurvivors, respectively (p < 0.0001 Wilcox rank-sum test). On multivariable analysis, a 1 mm Hg rise in partial pressure of arterial carbon dioxide was associated with a 3% increase in odds of survival (adjusted odds ratio, 1.03; 95% CI, 1.01-1.04) after adjusting for tidal volume and other potential confounders. These results remained significant on all sensitivity analyses. CONCLUSION In this sample of mechanically ventilated sepsis patients, we found an association between increasing levels of partial pressure of arterial carbon dioxide and survival to hospital discharge. These findings justify future studies to determine the optimal target partial pressure of arterial carbon dioxide range for mechanically ventilated sepsis patients.
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Affiliation(s)
- Brian W. Roberts
- The Department of Emergency Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, New Jersey
| | - Nicholas M. Mohr
- Departments of Emergency Medicine and Anesthesiology, Division of Critical Care Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa
| | - Enyo Ablordeppey
- Department of Emergency Medicine, Washington University School of Medicine in St. Louis, St. Louis, Missouri
- Department of Anesthesiology, Division of Critical Care, Washington University School of Medicine in St. Louis, St. Louis, Missouri
| | - Anne M. Drewry
- Department of Emergency Medicine, Washington University School of Medicine in St. Louis, St. Louis, Missouri
| | - Ian T. Ferguson
- School of Medicine and Medical Science, University College Dublin, Dublin, Ireland
| | - Stephen Trzeciak
- The Department of Emergency Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, New Jersey
- The Department of Medicine, Division of Critical Care Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, New Jersey
| | - Marin H. Kollef
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University School of Medicine in St. Louis, St. Louis, Missouri
| | - Brian M. Fuller
- Department of Emergency Medicine, Washington University School of Medicine in St. Louis, St. Louis, Missouri
- Department of Anesthesiology, Division of Critical Care, Washington University School of Medicine in St. Louis, St. Louis, Missouri
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Morales Quinteros L, Bringué Roque J, Kaufman D, Artigas Raventós A. Importance of carbon dioxide in the critical patient: Implications at the cellular and clinical levels. Med Intensiva 2018; 43:234-242. [PMID: 29486904 DOI: 10.1016/j.medin.2018.01.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 01/10/2018] [Accepted: 01/10/2018] [Indexed: 01/22/2023]
Abstract
Important recent insights have emerged regarding the cellular and molecular role of carbon dioxide (CO2) and the effects of hypercapnia. The latter may have beneficial effects in patients with acute lung injury, affording reductions in pulmonary inflammation, lessened oxidative alveolar damage, and the regulation of innate immunity and host defenses by inhibiting the expression of inflammatory cytokines. However, other studies suggest that CO2 can have deleterious effects upon the lung, reducing alveolar wound repair in lung injury, decreasing the rate of reabsorption of alveolar fluid, and inhibiting alveolar cell proliferation. Clearly, hypercapnia has both beneficial and harmful consequences, and it is important to determine the net effect under specific conditions. The purpose of this review is to describe the immunological and physiological effects of carbon dioxide, considering their potential consequences in patients with acute respiratory failure.
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Affiliation(s)
| | | | - David Kaufman
- Division of Pulmonary, Critical Care & Sleep, NYU School of Medicine, New York, NY, Estados Unidos
| | - Antonio Artigas Raventós
- Servicio de Medicina Intensiva, Hospital Universitario Sagrat Cor, Barcelona, España; Universidad Autónoma de Barcelona, Sabadell, Barcelona, España; Centro de Investigación Biomédica en Red de Enfermedades Respiratorias, España
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34
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Liu J, Wang W, Liu F, Li Z. Pediatric acute respiratory distress syndrome - current views. Exp Ther Med 2018; 15:1775-1780. [PMID: 29434764 PMCID: PMC5776650 DOI: 10.3892/etm.2017.5628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 11/29/2017] [Indexed: 12/18/2022] Open
Abstract
Acute respiratory distress syndrome (ARDS) mainly involves acute respiratory failure. In addition to this affected patients feel progressive arterial hypoxemia, dyspnea, and a marked increase in the work of breathing. The only clinical solution for the above pathological state is ventilation. Mechanical ventilation is necessary to support life in ARDs but it itself worsen lung injury and the term is known clinically as ‘ventilation induced lung injury’ (VILI). At the cellular level, respiratory epithelial cells are subjected to cyclic stretch, i.e. repeated cycles of positive and negative strain, during normal tidal ventilation. In aerated areas of diseased lungs, or even normal lungs subjected to injurious positive pressure mechanical ventilation, the cells are at risk of being over distended, and worsening injury by disrupting the alveolar epithelial barrier. Further, hypercapnic acidosis (HCA) in itself confers protection from stretch injury, potentially via a mechanisms involving inhibition of nuclear factor κB (NF-κB), a transcription factor central to inflammation, injury and repair. Mesenchymal stem cells are the latest in the field and are being investigated as a possible therapy for ARDS.
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Affiliation(s)
- Jinfeng Liu
- Department of Neonatology, Xuzhou Chlidren's Hospital, Xuzhou, Jiangsu 221002, P.R. China
| | - Wei Wang
- Department of Neonatology, Xuzhou Chlidren's Hospital, Xuzhou, Jiangsu 221002, P.R. China
| | - Fengli Liu
- Department of Neonatology, Xuzhou Chlidren's Hospital, Xuzhou, Jiangsu 221002, P.R. China
| | - Zhenguang Li
- Department of Neonatology, Xuzhou Chlidren's Hospital, Xuzhou, Jiangsu 221002, P.R. China
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Malek M, Hassanshahi J, Fartootzadeh R, Azizi F, Shahidani S. Nephrogenic acute respiratory distress syndrome: A narrative review on pathophysiology and treatment. Chin J Traumatol 2018; 21:4-10. [PMID: 29398292 PMCID: PMC5835491 DOI: 10.1016/j.cjtee.2017.07.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 07/13/2017] [Accepted: 08/04/2017] [Indexed: 02/04/2023] Open
Abstract
The kidneys have a close functional relationship with other organs especially the lungs. This connection makes the kidney and the lungs as the most organs involved in the multi-organ failure syndrome. The combination of acute lung injury (ALI) and renal failure results a great clinical significance of 80% mortality rate. Acute kidney injury (AKI) leads to an increase in circulating cytokines, chemokines, activated innate immune cells and diffuse of these agents to other organs such as the lungs. These factors initiate pathological cascade that ultimately leads to ALI and acute respiratory distress syndrome (ARDS). We comprehensively searched the English medical literature focusing on AKI, ALI, organs cross talk, renal failure, multi organ failure and ARDS using the databases of PubMed, Embase, Scopus and directory of open access journals. In this narrative review, we summarized the pathophysiology and treatment of respiratory distress syndrome following AKI. This review promotes knowledge of the link between kidney and lung with mechanisms, diagnostic biomarkers, and treatment involved ARDS induced by AKI.
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Affiliation(s)
- Maryam Malek
- Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
| | - Jalal Hassanshahi
- Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Reza Fartootzadeh
- Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Fatemeh Azizi
- Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Somayeh Shahidani
- Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
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Effects of Hypercapnia on Acute Cellular Rejection after Lung Transplantation in Rats. Anesthesiology 2017; 128:130-139. [PMID: 29023354 DOI: 10.1097/aln.0000000000001908] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND Hypercapnia alleviates pulmonary ischemia-reperfusion injury, regulates T lymphocytes, and inhibits immune reaction. This study aimed to evaluate the effect of hypercapnia on acute cellular rejection in a rat lung transplantation model. METHODS Recipient rats in sham-operated (Wistar), isograft (Wistar to Wistar), and allograft (Sprague-Dawley to Wistar) groups were ventilated with 50% oxygen, whereas rats in the hypercapnia (Sprague-Dawley to Wistar) group were administered 50% oxygen and 8% carbon dioxide for 90 min during reperfusion (n = 8). Recipients were euthanized 7 days after transplantation. RESULTS The hypercapnia group showed a higher oxygenation index (413 ± 78 vs. 223 ± 24), lower wet weight-to-dry weight ratio (4.23 ± 0.54 vs. 7.04 ± 0.80), lower rejection scores (2 ± 1 vs. 4 ± 1), and lower apoptosis index (31 ± 6 vs. 57 ± 4) as compared with the allograft group. The hypercapnia group showed lower CD8 (17 ± 4 vs. 31 ± 3) and CD68 (24 ± 3 vs. 43 ± 2), lower CD8 T cells (12 ± 2 vs. 35 ± 6), and higher CD4/CD8 ratio (2.2 ± 0.6 vs. 1.1 ± 0.4) compared to the allograft group. Tumor necrosis factor-α (208 ± 40 vs. 292 ± 49), interleukin-2 (30.6 ± 6.7 vs. 52.7 ± 8.3), and interferon-γ (28.1 ± 4.9 vs. 62.7 ± 10.1) levels in the hypercapnia group were lower than those in allograft group. CD4, CD4 T cells, and interleukin-10 levels were similar between groups. CONCLUSIONS Hypercapnia ameliorated acute cellular rejection in a rat lung transplantation model.
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Barnes T, Zochios V, Parhar K. Re-examining Permissive Hypercapnia in ARDS: A Narrative Review. Chest 2017; 154:185-195. [PMID: 29175086 DOI: 10.1016/j.chest.2017.11.010] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 10/20/2017] [Accepted: 11/13/2017] [Indexed: 12/16/2022] Open
Abstract
Lung-protective ventilation (LPV) has become the cornerstone of management in patients with ARDS. A subset of patients is unable to tolerate LPV without significant CO2 elevation. In these patients, permissive hypercapnia is used. Although thought to be benign, it is becoming increasingly evident that elevated CO2 levels have significant physiological effects. In this narrative review, we highlight clinically relevant end-organ effects in both animal models and clinical studies. We also explore the association between elevated CO2, acute cor pulmonale, and ICU mortality. We conclude with a brief review of alternative therapies for CO2 management currently under investigation in patients with moderate to severe ARDS.
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Affiliation(s)
- Tavish Barnes
- Department of Critical Care Medicine, University of Calgary, Calgary, AB, Canada
| | - Vasileios Zochios
- Department of Critical Care Medicine, University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital, College of Medical and Dental Sciences, University of Birmingham, Birmingham, England
| | - Ken Parhar
- Department of Critical Care Medicine, University of Calgary, Calgary, AB, Canada.
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Radermacher P, Maggiore SM, Mercat A. FiftyYears ofResearch inARDS.Gas Exchange in Acute Respiratory Distress Syndrome. Am J Respir Crit Care Med 2017; 196:964-984. [DOI: 10.1164/rccm.201610-2156so] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Peter Radermacher
- Institute of Anaesthesiological Pathophysiology and Process Engineering, University Medical School, Ulm, Germany
| | - Salvatore Maurizio Maggiore
- Section of Anesthesia, Analgesia, Perioperative, and Intensive Care, Department of Medical, Oral, and Biotechnological Sciences, School of Medicine and Health Sciences, “SS. Annunziata” Hospital, “Gabriele d’Annunzio” University of Chieti-Pescara, Chieti, Italy; and
| | - Alain Mercat
- Department of Medical Intensive Care and Hyperbaric Medicine, Angers University Hospital, Angers, France
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Fuller BM, Mohr NM, Drewry AM, Ferguson IT, Trzeciak S, Kollef MH, Roberts BW. Partial pressure of arterial carbon dioxide and survival to hospital discharge among patients requiring acute mechanical ventilation: A cohort study. J Crit Care 2017; 41:29-35. [PMID: 28472700 PMCID: PMC5633513 DOI: 10.1016/j.jcrc.2017.04.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 04/18/2017] [Accepted: 04/21/2017] [Indexed: 10/19/2022]
Abstract
PURPOSE To describe the prevalence of hypocapnia and hypercapnia during the earliest period of mechanical ventilation, and determine the association between PaCO2 and mortality. MATERIALS AND METHODS A cohort study using an emergency department registry of mechanically ventilated patients. PaCO2 was categorized: hypocapnia (<35mmHg), normocapnia (35-45mmHg), and hypercapnia (>45mmHg). The primary outcome was survival to hospital discharge. RESULTS A total of 1,491 patients were included. Hypocapnia occurred in 375 (25%) patients and hypercapnia in 569 (38%). Hypercapnia (85%) had higher survival rate compared to normocapnia (74%) and hypocapnia (66%), P<0.001. PaCO2 was an independent predictor of survival to hospital discharge [hypocapnia (aOR 0.65 (95% confidence interval [CI] 0.48-0.89), normocapnia (reference category), hypercapnia (aOR 1.83 (95% CI 1.32-2.54)]. Over ascending ranges of PaCO2, there was a linear trend of increasing survival up to a PaCO2 range of 66-75mmHg, which had the strongest survival association, aOR 3.18 (95% CI 1.35-7.50). CONCLUSIONS Hypocapnia and hypercapnia occurred frequently after initiation of mechanical ventilation. Higher PaCO2 levels were associated with increased survival. These data provide rationale for a trial examining the optimal PaCO2 in the critically ill.
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Affiliation(s)
- Brian M Fuller
- Departments of Emergency Medicine and Anesthesiology, Division of Critical Care Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, United States.
| | - Nicholas M Mohr
- Departments of Emergency Medicine and Anesthesiology, Division of Critical Care Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, 200 Hawkins Drive, 1008 RCP, Iowa City, IA 52242, United States.
| | - Anne M Drewry
- Department of Anesthesiology, Division of Critical Care Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, United States.
| | - Ian T Ferguson
- School of Medicine and Medical Science, University College Dublin, Dublin 4, Ireland.
| | - Stephen Trzeciak
- Departments of Medicine and Emergency Medicine, Division of Critical Care Medicine, Cooper University Hospital, One Cooper Plaza, K152, Camden, NJ 08103, United States.
| | - Marin H Kollef
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, United States.
| | - Brian W Roberts
- Department of Emergency Medicine, Cooper University Hospital, One Cooper Plaza, K152, Camden, NJ 08103, United States.
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Cordioli RL, Costa ELV, Azevedo LCP, Gomes S, Amato MBP, Park M. Physiologic effects of alveolar recruitment and inspiratory pauses during moderately-high-frequency ventilation delivered by a conventional ventilator in a severe lung injury model. PLoS One 2017; 12:e0185769. [PMID: 28961282 PMCID: PMC5621701 DOI: 10.1371/journal.pone.0185769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 09/19/2017] [Indexed: 11/18/2022] Open
Abstract
Background and aims To investigate whether performing alveolar recruitment or adding inspiratory pauses could promote physiologic benefits (VT) during moderately-high-frequency positive pressure ventilation (MHFPPV) delivered by a conventional ventilator in a porcine model of severe acute respiratory distress syndrome (ARDS). Methods Prospective experimental laboratory study with eight pigs. Induction of acute lung injury with sequential pulmonary lavages and injurious ventilation was initially performed. Then, animals were ventilated on a conventional mechanical ventilator with a respiratory rate (RR) = 60 breaths/minute and PEEP titrated according to ARDS Network table. The first two steps consisted of a randomized order of inspiratory pauses of 10 and 30% of inspiratory time. In final step, we removed the inspiratory pause and titrated PEEP, after lung recruitment, with the aid of electrical impedance tomography. At each step, PaCO2 was allowed to stabilize between 57–63 mmHg for 30 minutes. Results The step with RR of 60 after lung recruitment had the highest PEEP when compared with all other steps (17 [16,19] vs 14 [10, 17]cmH2O), but had lower driving pressures (13 [13,11] vs 16 [14, 17]cmH2O), higher P/F ratios (212 [191,243] vs 141 [105, 184] mmHg), lower shunt (23 [20, 23] vs 32 [27, 49]%), lower dead space ventilation (10 [0, 15] vs 30 [20, 37]%), and a more homogeneous alveolar ventilation distribution. There were no detrimental effects in terms of lung mechanics, hemodynamics, or gas exchange. Neither the addition of inspiratory pauses or the alveolar recruitment maneuver followed by decremental PEEP titration resulted in further reductions in VT. Conclusions During MHFPPV set with RR of 60 bpm delivered by a conventional ventilator in severe ARDS swine model, neither the inspiratory pauses or PEEP titration after recruitment maneuver allowed reduction of VT significantly, however the last strategy decreased driving pressures and improved both shunt and dead space.
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Affiliation(s)
- Ricardo Luiz Cordioli
- Research and Education Institute, Hospital Sírio-Libanês, São Paulo, Brazil
- Cardio-Pulmonary Department, Pulmonary Division, Heart Institute (Incor), University of São Paulo, São Paulo, Brazil
- Intensive Care Unit, Hospital Israelita Albert Einstein, São Paulo, Brazil
- Intensive Care Unit, Hospital Alemão Oswaldo Cruz, São Paulo, Brazil
- * E-mail:
| | - Eduardo Leite Vieira Costa
- Research and Education Institute, Hospital Sírio-Libanês, São Paulo, Brazil
- Cardio-Pulmonary Department, Pulmonary Division, Heart Institute (Incor), University of São Paulo, São Paulo, Brazil
| | - Luciano Cesar Pontes Azevedo
- Research and Education Institute, Hospital Sírio-Libanês, São Paulo, Brazil
- Emergency Medicine Discipline, Universidade de São Paulo, São Paulo, Brazil
| | - Susimeire Gomes
- Cardio-Pulmonary Department, Pulmonary Division, Heart Institute (Incor), University of São Paulo, São Paulo, Brazil
| | - Marcelo Britto Passos Amato
- Cardio-Pulmonary Department, Pulmonary Division, Heart Institute (Incor), University of São Paulo, São Paulo, Brazil
| | - Marcelo Park
- Research and Education Institute, Hospital Sírio-Libanês, São Paulo, Brazil
- Emergency Medicine Discipline, Universidade de São Paulo, São Paulo, Brazil
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Gao S, Zhang Z, Brunelli A, Chen C, Chen C, Chen G, Chen H, Chen JS, Cassivi S, Chai Y, Downs JB, Fang W, Fu X, Garutti MI, He J, He J, Hu J, Huang Y, Jiang G, Jiang H, Jiang Z, Li D, Li G, Li H, Li Q, Li X, Li Y, Li Z, Liu CC, Liu D, Liu L, Liu Y, Ma H, Mao W, Mao Y, Mou J, Ng CSH, Petersen RH, Qiao G, Rocco G, Ruffini E, Tan L, Tan Q, Tong T, Wang H, Wang Q, Wang R, Wang S, Xie D, Xue Q, Xue T, Xu L, Xu S, Xu S, Yan T, Yu F, Yu Z, Zhang C, Zhang L, Zhang T, Zhang X, Zhao X, Zhao X, Zhi X, Zhou Q. The Society for Translational Medicine: clinical practice guidelines for mechanical ventilation management for patients undergoing lobectomy. J Thorac Dis 2017; 9:3246-3254. [PMID: 29221302 PMCID: PMC5708473 DOI: 10.21037/jtd.2017.08.166] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Patients undergoing lobectomy are at significantly increased risk of lung injury. One-lung ventilation is the most commonly used technique to maintain ventilation and oxygenation during the operation. It is a challenge to choose an appropriate mechanical ventilation strategy to minimize the lung injury and other adverse clinical outcomes. In order to understand the available evidence, a systematic review was conducted including the following topics: (I) protective ventilation (PV); (II) mode of mechanical ventilation [e.g., volume controlled (VCV) versus pressure controlled (PCV)]; (III) use of therapeutic hypercapnia; (IV) use of alveolar recruitment (open-lung) strategy; (V) pre-and post-operative application of positive end expiratory pressure (PEEP); (VI) Inspired Oxygen concentration; (VII) Non-intubated thoracoscopic lobectomy; and (VIII) adjuvant pharmacologic options. The recommendations of class II are non-intubated thoracoscopic lobectomy may be an alternative to conventional one-lung ventilation in selected patients. The recommendations of class IIa are: (I) Therapeutic hypercapnia to maintain a partial pressure of carbon dioxide at 50-70 mmHg is reasonable for patients undergoing pulmonary lobectomy with one-lung ventilation; (II) PV with a tidal volume of 6 mL/kg and PEEP of 5 cmH2O are reasonable methods, based on current evidence; (III) alveolar recruitment [open lung ventilation (OLV)] may be beneficial in patients undergoing lobectomy with one-lung ventilation; (IV) PCV is recommended over VCV for patients undergoing lung resection; (V) pre- and post-operative CPAP can improve short-term oxygenation in patients undergoing lobectomy with one-lung ventilation; (VI) controlled mechanical ventilation with I:E ratio of 1:1 is reasonable in patients undergoing one-lung ventilation; (VII) use of lowest inspired oxygen concentration to maintain satisfactory arterial oxygen saturation is reasonable based on physiologic principles; (VIII) Adjuvant drugs such as nebulized budesonide, intravenous sivelestat and ulinastatin are reasonable and can be used to attenuate inflammatory response.
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Affiliation(s)
- Shugeng Gao
- Department of Thoracic Surgical Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Cancer Center, Beijing 100021, China
| | - Zhongheng Zhang
- Department of Emergency Medicine, Sir Run-Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310016, China
| | | | - Chang Chen
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Shanghai 200433, China
| | - Chun Chen
- Department of Thoracic Surgery, Fujian Medical University Union Hospital, Fujian 350001, China
| | - Gang Chen
- Department of Thoracic Surgery, Guangdong General Hospital, Guangzhou 510080, China
| | | | - Jin-Shing Chen
- Department of Anesthesiology, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei 10002, Taiwan
| | | | - Ying Chai
- Second Affiliated Hospital, Medical College of Zhejiang University, Hangzhou 310009, China
| | - John B. Downs
- Department of Anesthesiology and Critical Care Medicine, University of Florida, Gainesville, FL, USA
| | - Wentao Fang
- Shanghai Chest Hospital, Shanghai 200030, China
| | - Xiangning Fu
- Department of Thoracic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Martínez I. Garutti
- Department of Anaesthesia and Postoperative Care, Hospital General Universitario Gregorio Marañon, Madrid, Spain
| | - Jianxing He
- Department of Thoracic Surgery, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510000, China
- Guangzhou Institute of Respiratory Disease & China State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou 510000, China
| | - Jie He
- Department of Thoracic Surgical Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Cancer Center, Beijing 100021, China
| | - Jian Hu
- First Affiliated Hospital, Medical College of Zhejiang University, Hangzhou 310003, China
| | - Yunchao Huang
- Department of Thoracic Surgery, Yunnan Cancer Hospital, Kunming 650100, China
| | - Gening Jiang
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Shanghai 200433, China
| | - Hongjing Jiang
- Department of Esophageal Oncology, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Zhongmin Jiang
- Department of Thoracic Surgery, Shandong Qianfoshan Hospital, Jinan 250014, China
| | - Danqing Li
- Department of Thoracic Surgery, Peking Union Medical College Hospital, Beijing 100032, China
| | - Gaofeng Li
- Department of Thoracic Surgery, Yunnan Cancer Hospital, Kunming 650100, China
| | - Hui Li
- Department of Thoracic Surgery, Beijing Chaoyang Hospital, Beijing 100049, China
| | - Qiang Li
- Department of Thoracic Surgery, Sichuan Cancer Hospital and Institute, Chengdu 610041, China
| | - Xiaofei Li
- Department of Thoracic Surgery, Tangdu Hospital Fourth Military Medical University, Xi’an 710038, China
| | - Yin Li
- Department of Thoracic Surgery, Henan Cancer Hospital, Zhengzhou 450008, China
| | - Zhijun Li
- Department of Thoracic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310016, China
| | - Chia-Chuan Liu
- Division of Thoracic Surgery, Department of Surgery, Sun Yat-Sen Cancer Center, Taipei, Taiwan
| | - Deruo Liu
- Department of Thoracic Surgery, China and Japan Friendship Hospital, Beijing 100029, China
| | - Lunxu Liu
- Department of Cardiovascular and Thoracic Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Yongyi Liu
- Department of Thoracic Surgery, Liaoning Cancer Hospital and Institute, Shengyang 110042, China
| | - Haitao Ma
- Department of Thoracic Surgery, The First Hospital Affiliated to Soochow University, Suzhou 215000, China
| | - Weimin Mao
- Department of Thoracic Surgery, Zhejiang Cancer Hospital, Hangzhou 310000, China
| | - Yousheng Mao
- Department of Thoracic Surgical Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Cancer Center, Beijing 100021, China
| | - Juwei Mou
- Department of Thoracic Surgical Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Cancer Center, Beijing 100021, China
| | - Calvin Sze Hang Ng
- Department of Surgery, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, N.T., Hong Kong, China
| | - René H. Petersen
- Department of Cardiothoracic Surgery, Rigshospitalet, Copenhagen, Denmark
| | - Guibin Qiao
- Department of Thoracic Surgery, Guangzhou General Hospital of Guangzhou Military Area Command, Guangzhou 510000, China
| | - Gaetano Rocco
- Department of Thoracic Surgery and Oncology, National Cancer Institute, Pascale Foundation, Naples, Italy
| | - Erico Ruffini
- Thoracic Surgery Unit, University of Torino, Torino, Italy
| | - Lijie Tan
- Department of Thoracic Surgery, Shanghai Zhongshan Hospital of Fudan University, Shanghai 200032, China
| | - Qunyou Tan
- Department of Thoracic Surgery, Daping Hospital, Research Institute of Surgery Third Military Medical University, Chongqing 400042, China
| | - Tang Tong
- Department of Thoracic Surgery, Second Affiliated Hospital of Jilin University, Changchun 130041, China
| | - Haidong Wang
- Department of Thoracic Surgery, Southwest Hospital, Third Millitary Medical University, Chongqing 400038, China
| | - Qun Wang
- Department of Thoracic Surgery, Shanghai Zhongshan Hospital of Fudan University, Shanghai 200032, China
| | - Ruwen Wang
- Department of Thoracic Surgery, Daping Hospital, Research Institute of Surgery Third Military Medical University, Chongqing 400042, China
| | - Shumin Wang
- Department of Thoracic Surgery, General Hospital of Shenyang Military Area, Shenyang 110015, China
| | - Deyao Xie
- Department of Cardiovascular and Thoracic Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Qi Xue
- Department of Thoracic Surgical Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Cancer Center, Beijing 100021, China
| | - Tao Xue
- Department of Thoracic Surgery, Zhongda Hospital Southeast University, Nanjing 210009, China
| | - Lin Xu
- Department of Thoracic Surgery, Jiangsu Cancer Hospital, Nanjing 210008, China
| | - Shidong Xu
- Department of Thoracic Surgery, Heilongjiang Cancer Hospital, Harbin 150049, China
| | - Songtao Xu
- Department of Thoracic Surgery, Shanghai Zhongshan Hospital of Fudan University, Shanghai 200032, China
| | - Tiansheng Yan
- Department of Thoracic Surgery, Peking University Third Hospital, Beijing 100083, China
| | - Fenglei Yu
- Department of Cardiovascular Surgery, Second Xiangya Hospital of Central South University, Changsha 410011, China
| | - Zhentao Yu
- Department of Esophageal Oncology, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Chunfang Zhang
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Lanjun Zhang
- Cancer Center, San Yat-sen University, Guangzhou 510060, China
| | - Tao Zhang
- Department of Thoracic Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
| | - Xun Zhang
- Department of Thoracic Surgery, Tanjin Chest Hospital, Tianjin 300300, China
| | - Xiaojing Zhao
- Department of Thoracic Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200000, China
| | - Xuewei Zhao
- Department of Thoracic Surgery, Shanghai Changzheng Hospital, Shanghai 200000, China
| | - Xiuyi Zhi
- Department of Thoracic Surgery, Xuanwu Hospital of Capital University of Medical Sciences, Beijing 100053, China
| | - Qinghua Zhou
- Department of Thoracic Surgery, Liaoning Cancer Hospital and Institute, Shengyang 110042, China
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Tiruvoipati R, Pilcher D, Buscher H, Botha J, Bailey M. Effects of Hypercapnia and Hypercapnic Acidosis on Hospital Mortality in Mechanically Ventilated Patients. Crit Care Med 2017; 45:e649-e656. [PMID: 28406813 DOI: 10.1097/ccm.0000000000002332] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVES Lung-protective ventilation is used to prevent further lung injury in patients on invasive mechanical ventilation. However, lung-protective ventilation can cause hypercapnia and hypercapnic acidosis. There are no large clinical studies evaluating the effects of hypercapnia and hypercapnic acidosis in patients requiring mechanical ventilation. DESIGN Multicenter, binational, retrospective study aimed to assess the impact of compensated hypercapnia and hypercapnic acidosis in patients receiving mechanical ventilation. SETTINGS Data were extracted from the Australian and New Zealand Intensive Care Society Centre for Outcome and Resource Evaluation Adult Patient Database over a 14-year period where 171 ICUs contributed deidentified data. PATIENTS Patients were classified into three groups based on a combination of pH and carbon dioxide levels (normocapnia and normal pH, compensated hypercapnia [normal pH with elevated carbon dioxide], and hypercapnic acidosis) during the first 24 hours of ICU stay. Logistic regression analysis was used to identify the independent association of hypercapnia and hypercapnic acidosis with hospital mortality. INTERVENTIONS Nil. MEASUREMENTS AND MAIN RESULTS A total of 252,812 patients (normocapnia and normal pH, 110,104; compensated hypercapnia, 20,463; and hypercapnic acidosis, 122,245) were included in analysis. Patients with compensated hypercapnia and hypercapnic acidosis had higher Acute Physiology and Chronic Health Evaluation III scores (49.2 vs 53.2 vs 68.6; p < 0.01). The mortality was higher in hypercapnic acidosis patients when compared with other groups, with the lowest mortality in patients with normocapnia and normal pH. After adjusting for severity of illness, the adjusted odds ratio for hospital mortality was higher in hypercapnic acidosis patients (odds ratio, 1.74; 95% CI, 1.62-1.88) and compensated hypercapnia (odds ratio, 1.18; 95% CI, 1.10-1.26) when compared with patients with normocapnia and normal pH (p < 0.001). In patients with hypercapnic acidosis, the mortality increased with increasing PCO2 until 65 mm Hg after which the mortality plateaued. CONCLUSIONS Hypercapnic acidosis during the first 24 hours of intensive care admission is more strongly associated with increased hospital mortality than compensated hypercapnia or normocapnia.
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Affiliation(s)
- Ravindranath Tiruvoipati
- 1Department of Intensive Care Medicine, Frankston Hospital, Frankston, VIC, Australia.2Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, VIC, Australia.3ANZIC-RC, Department of Epidemiology & Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, The Alfred Centre, Melbourne, VIC, Australia.4Department of Intensive Care Medicine, St Vincent's Hospital, Sydney, NSW, Australia.5University of New South Wales, Kensington, NSW, Australia
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Fuchs H, Rossmann N, Schmid MB, Hoenig M, Thome U, Mayer B, Klotz D, Hummler HD. Permissive hypercapnia for severe acute respiratory distress syndrome in immunocompromised children: A single center experience. PLoS One 2017. [PMID: 28632754 PMCID: PMC5478142 DOI: 10.1371/journal.pone.0179974] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Controlled hypoventilation while accepting hypercapnia has been advocated to reduce ventilator-induced lung injury. The aim of the study was to analyze outcomes of a cohort of immunocompromised children with acute respiratory distress syndrome (ARDS) ventilated with a strategy of stepwise increasing PCO2 targets up to 140 mm Hg. METHODS Retrospective analysis of outcomes of a cohort of children with oncologic disease or after stem cell transplantation and severe respiratory failure in comparison with a historical control cohort. RESULTS Out of 150 episodes of admission to the PICU 88 children underwent invasive mechanical ventilation for >24h (overall survival 75%). In a subgroup of 38 children with high ventilator requirements the PCO2 target ranges were increased stepwise. Fifteen children survived and were discharged from the PICU. Severe pulmonary hypertension was seen in two patients and no case of cerebral edema was observed. Long term outcome was available in 15 patients and 10 of these patients survived without adverse neurological sequelae. With introduction of this strategy survival of immunocompromised children undergoing mechanical ventilation for >24h increased to 48% compared to 32% prior to introduction (historical cohort). CONCLUSIONS A ventilation strategy incorporating very high carbon dioxide levels to allow for low tidal volumes and limited inspiratory pressures is feasible in children. Even severe hypercapnia may be well tolerated. No severe side effects associated with hypercapnia were observed. This strategy could potentially increase survival in immunocompromised children with severe ARDS.
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Affiliation(s)
- Hans Fuchs
- Center for Pediatrics, Department of Neonatology and Pediatric Intensive Care, Medical Center – Albert Ludwig University of Freiburg, Faculty of Medicine, Freiburg, Germany
- * E-mail:
| | - Nicola Rossmann
- Division of Neonatology and Pediatric Critical Care, Department for Pediatrics and Adolescent Medicine, Ulm University, Ulm, Germany
| | - Manuel B. Schmid
- Department of Neonatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Manfred Hoenig
- Oncology and stem cell transplantation, Department for Pediatrics and Adolescent Medicine, Ulm University, Ulm, Germany
| | - Ulrich Thome
- Division of Neonatology, University Hospital of Leipzig, Leipzig, Germany
| | - Benjamin Mayer
- Institute of Epidemiology and Medical Biometry, Ulm University, Ulm, Germany
| | - Daniel Klotz
- Center for Pediatrics, Department of Neonatology and Pediatric Intensive Care, Medical Center – Albert Ludwig University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Helmut D. Hummler
- Division of Neonatology and Pediatric Critical Care, Department for Pediatrics and Adolescent Medicine, Ulm University, Ulm, Germany
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44
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Repessé X, Vieillard-Baron A. Hypercapnia during acute respiratory distress syndrome: the tree that hides the forest! J Thorac Dis 2017; 9:1420-1425. [PMID: 28740647 DOI: 10.21037/jtd.2017.05.69] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Xavier Repessé
- Intensive Care Unit, Section Thorax-Vascular Disease-Abdomen-Metabolism, University Hospital Ambroise Paré, Boulogne-Billancourt, France
| | - Antoine Vieillard-Baron
- Intensive Care Unit, Section Thorax-Vascular Disease-Abdomen-Metabolism, University Hospital Ambroise Paré, Boulogne-Billancourt, France.,Faculty of Medicine Paris Ile-de-France Ouest, University of Versailles Saint-Quentin en Yvelines, Saint-Quentin en Yvelines, France.,INSERM U-1018, CESP, Team 5 (EpReC, Renal and Cardiovascular Epidemiology), UVSQ, Villejuif, France
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45
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Diaphragm ultrasound as a new functional and morphological index of outcome, prognosis and discontinuation from mechanical ventilation in critically ill patients and evaluating the possible protective indices against VIDD. EGYPTIAN JOURNAL OF CHEST DISEASES AND TUBERCULOSIS 2017. [DOI: 10.1016/j.ejcdt.2016.10.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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46
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Otulakowski G, Engelberts D, Arima H, Hirate H, Bayir H, Post M, Kavanagh BP. α-Tocopherol transfer protein mediates protective hypercapnia in murine ventilator-induced lung injury. Thorax 2017; 72:538-549. [PMID: 28159772 DOI: 10.1136/thoraxjnl-2016-209501] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 01/06/2017] [Accepted: 01/09/2017] [Indexed: 12/27/2022]
Abstract
RATIONALE Hypercapnia is common in mechanically ventilated patients. Experimentally, 'therapeutic hypercapnia' can protect, but it can also cause harm, depending on the mechanism of injury. Hypercapnia suppresses multiple signalling pathways. Previous investigations have examined mechanisms that were known a priori, but only a limited number of pathways, each suppressed by CO2, have been reported. OBJECTIVE Because of the complexity and interdependence of processes in acute lung injury, this study sought to fill in knowledge gaps using an unbiased screen, aiming to identify a specifically upregulated pathway. METHODS AND RESULTS Using genome-wide gene expression analysis in a mouse model of ventilator-induced lung injury, we discovered a previously unsuspected mechanism by which CO2 can protect against injury: induction of the transporter protein for α-tocopherol, α-tocopherol transfer protein (αTTP). Pulmonary αTTP was induced by inspired CO2 in two in vivo murine models of ventilator-induced lung injury; the level of αTTP expression correlated with degree of lung protection; and, absence of the αTTP gene significantly reduced the protective effects of CO2. α-Tocopherol is a potent antioxidant and hypercapnia increased lung α-tocopherol in wild-type mice, but this did not alter superoxide generation or expression of NRF2-dependent antioxidant response genes in wild-type or in αTTP-/- mice. In concordance with a regulatory role for α-tocopherol in lipid mediator synthesis, hypercapnia attenuated 5-lipoxygenase activity and this was dependent on the presence of αTTP. CONCLUSIONS Inspired CO2 upregulates αTTP which increases lung α-tocopherol levels and inhibits synthesis of a pathogenic chemoattractant.
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Affiliation(s)
- Gail Otulakowski
- Physiology and Experimental Medicine, Hospital for Sick Children, Toronto, Canada
| | - Doreen Engelberts
- Physiology and Experimental Medicine, Hospital for Sick Children, Toronto, Canada
| | - Hajime Arima
- Physiology and Experimental Medicine, Hospital for Sick Children, Toronto, Canada.,Department of Critical Care Medicine, Hospital for Sick Children, Toronto, Canada.,Department of Anesthesiology and Intensive Care Medicine, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Hiroyuki Hirate
- Physiology and Experimental Medicine, Hospital for Sick Children, Toronto, Canada.,Department of Critical Care Medicine, Hospital for Sick Children, Toronto, Canada.,Department of Anesthesiology and Intensive Care Medicine, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Hülya Bayir
- Department of Environmental and Occupational Health, Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.,Department of Critical Care Medicine, Safar Center for Resuscitation Research, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Martin Post
- Physiology and Experimental Medicine, Hospital for Sick Children, Toronto, Canada
| | - Brian P Kavanagh
- Physiology and Experimental Medicine, Hospital for Sick Children, Toronto, Canada.,Department of Critical Care Medicine, Hospital for Sick Children, Toronto, Canada.,Department of Anesthesia, University of Toronto, Toronto, Canada
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47
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Severe hypercapnia and outcome of mechanically ventilated patients with moderate or severe acute respiratory distress syndrome. Intensive Care Med 2017; 43:200-208. [PMID: 28108768 DOI: 10.1007/s00134-016-4611-1] [Citation(s) in RCA: 141] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Accepted: 10/25/2016] [Indexed: 12/11/2022]
Abstract
PURPOSE To analyze the relationship between hypercapnia developing within the first 48 h after the start of mechanical ventilation and outcome in patients with acute respiratory distress syndrome (ARDS). PATIENTS AND METHODS We performed a secondary analysis of three prospective non-interventional cohort studies focusing on ARDS patients from 927 intensive care units (ICUs) in 40 countries. These patients received mechanical ventilation for more than 12 h during 1-month periods in 1998, 2004, and 2010. We used multivariable logistic regression and a propensity score analysis to examine the association between hypercapnia and ICU mortality. MAIN OUTCOMES We included 1899 patients with ARDS in this study. The relationship between maximum PaCO2 in the first 48 h and mortality suggests higher mortality at or above PaCO2 of ≥50 mmHg. Patients with severe hypercapnia (PaCO2 ≥50 mmHg) had higher complication rates, more organ failures, and worse outcomes. After adjusting for age, SAPS II score, respiratory rate, positive end-expiratory pressure, PaO2/FiO2 ratio, driving pressure, pressure/volume limitation strategy (PLS), corrected minute ventilation, and presence of acidosis, severe hypercapnia was associated with increased risk of ICU mortality [odds ratio (OR) 1.93, 95% confidence interval (CI) 1.32 to 2.81; p = 0.001]. In patients with severe hypercapnia matched for all other variables, ventilation with PLS was associated with higher ICU mortality (OR 1.58, CI 95% 1.04-2.41; p = 0.032). CONCLUSIONS Severe hypercapnia appears to be independently associated with higher ICU mortality in patients with ARDS. TRIAL REGISTRATION Clinicaltrials.gov identifier, NCT01093482.
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48
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Vasopressin V1A receptors mediate the stabilization of intestinal mucosal oxygenation during hypercapnia in septic rats. Microvasc Res 2016; 106:24-30. [DOI: 10.1016/j.mvr.2016.03.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 02/28/2016] [Accepted: 03/05/2016] [Indexed: 12/27/2022]
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49
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Valenza F, Citerio G, Palleschi A, Vargiolu A, Fakhr BS, Confalonieri A, Nosotti M, Gatti S, Ravasi S, Vesconi S, Pesenti A, Blasi F, Santambrogio L, Gattinoni L. Successful Transplantation of Lungs From an Uncontrolled Donor After Circulatory Death Preserved In Situ by Alveolar Recruitment Maneuvers and Assessed by Ex Vivo Lung Perfusion. Am J Transplant 2016; 16:1312-8. [PMID: 26603283 PMCID: PMC5021126 DOI: 10.1111/ajt.13612] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 09/16/2015] [Accepted: 10/14/2015] [Indexed: 01/25/2023]
Abstract
We developed a protocol to procure lungs from uncontrolled donors after circulatory determination of death (NCT02061462). Subjects with cardiovascular collapse, treated on scene by a resuscitation team and transferred to the emergency room, are considered potential donors once declared dead. Exclusion criteria include unwitnessed collapse, no-flow period of >15 min and low flow >60 min. After death, lung preservation with recruitment maneuvers, continuous positive airway pressure, and protective mechanical ventilation is applied to the donor. After procurement, ex vivo lung perfusion (EVLP) is performed. From November 2014, 10 subjects were considered potential donors; one of these underwent the full process of procurement, EVLP, and transplantation. The donor was a 46-year-old male who died because of thoracic aortic dissection. Lungs were procured 4 h and 48 min after death, and deemed suitable for transplantation after EVLP. Lungs were then offered to a rapidly deteriorating recipient with cystic fibrosis (lung allocation score [LAS] 46) who consented to the transplant in this experimental setting. Six months after transplantation, the recipient is in good condition (forced expiratory volume in 1 s 85%) with no signs of rejection. This protocol allowed procurement of lungs from an uncontrolled donor after circulatory determination of death following an extended period of warm ischemia.
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Affiliation(s)
- F. Valenza
- Dipartimento di Anestesia Rianimazione (Intensiva e Sub intensiva) e Terapia del doloreFondazione IRCCS Ca’ Granda–Ospedale Maggiore PoliclinicoMilanItaly,Dipartimento di Fisiopatologica Medico‐Chirurgica e dei TrapiantiUniversità degli Studi di MilanoMilanItaly
| | - G. Citerio
- Scuola di Medicina e ChirurgiaUniversità di Milano‐BicoccaMilanItaly,Dipartimento Anestesia e RianimazioneAzienda Ospedaliera San GerardoMonzaItaly
| | - A. Palleschi
- Unità Operativa di Chirurgia ToracicaFondazione IRCCS Ca’ Granda–Ospedale Maggiore PoliclinicoMilanItaly
| | - A. Vargiolu
- Dipartimento Anestesia e RianimazioneAzienda Ospedaliera San GerardoMonzaItaly
| | - B. Safaee Fakhr
- Dipartimento di Anestesia Rianimazione (Intensiva e Sub intensiva) e Terapia del doloreFondazione IRCCS Ca’ Granda–Ospedale Maggiore PoliclinicoMilanItaly
| | - A. Confalonieri
- Dipartimento Anestesia e RianimazioneAzienda Ospedaliera San GerardoMonzaItaly
| | - M. Nosotti
- Dipartimento di Fisiopatologica Medico‐Chirurgica e dei TrapiantiUniversità degli Studi di MilanoMilanItaly,Unità Operativa di Chirurgia ToracicaFondazione IRCCS Ca’ Granda–Ospedale Maggiore PoliclinicoMilanItaly
| | - S. Gatti
- Centro di Ricerche Chirurgiche PreclinicheFondazione IRCCS Ca’ Granda–Ospedale Maggiore PoliclinicoMilanItaly
| | - S. Ravasi
- Dipartimento Emergenza Urgenza–EASMilanItaly
| | - S. Vesconi
- Direzione Generale Salute LombardiaRegione LombardiaMilanItaly
| | - A. Pesenti
- Scuola di Medicina e ChirurgiaUniversità di Milano‐BicoccaMilanItaly,Dipartimento Anestesia e RianimazioneAzienda Ospedaliera San GerardoMonzaItaly
| | - F. Blasi
- Dipartimento di Fisiopatologica Medico‐Chirurgica e dei TrapiantiUniversità degli Studi di MilanoMilanItaly,Unità Operativa Complessa BroncopneumologiaFondazione IRCCS Ca’ Granda–Ospedale Maggiore PoliclinicoMilanItaly
| | - L. Santambrogio
- Dipartimento di Fisiopatologica Medico‐Chirurgica e dei TrapiantiUniversità degli Studi di MilanoMilanItaly,Unità Operativa di Chirurgia ToracicaFondazione IRCCS Ca’ Granda–Ospedale Maggiore PoliclinicoMilanItaly
| | - L. Gattinoni
- Dipartimento di Anestesia Rianimazione (Intensiva e Sub intensiva) e Terapia del doloreFondazione IRCCS Ca’ Granda–Ospedale Maggiore PoliclinicoMilanItaly,Dipartimento di Fisiopatologica Medico‐Chirurgica e dei TrapiantiUniversità degli Studi di MilanoMilanItaly
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50
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Horie S, Ansari B, Masterson C, Devaney J, Scully M, O'Toole D, Laffey JG. Hypercapnic acidosis attenuates pulmonary epithelial stretch-induced injury via inhibition of the canonical NF-κB pathway. Intensive Care Med Exp 2016; 4:8. [PMID: 27001525 PMCID: PMC4801837 DOI: 10.1186/s40635-016-0081-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 03/14/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Hypercapnia, with its associated acidosis (HCA), is a consequence of respiratory failure and is also seen in critically ill patients managed with conventional "protective" ventilation strategies. Nuclear factor kappa-B (NF-κB), a pivotal transcription factor, is activated in the setting of injury and repair and is central to innate immunity. We have previously established that HCA protects against ventilation-induced lung injury in vivo, potentially via a mechanism involving inhibition of NF-κB signaling. We wished to further elucidate the role and mechanism of HCA-mediated inhibition of the NF-κB pathway in attenuating stretch-induced injury in vitro. METHODS Initial experiments examined the effect of HCA on cyclic stretch-induced inflammation and injury in human bronchial and alveolar epithelial cells. Subsequent experiments examined the role of the canonical NF-κB pathway in mediating stretch-induced injury and the mechanism of action of HCA. The contribution of pH versus CO2 in mediating this effect of HCA was also examined. RESULTS Pulmonary epithelial high cyclic stretch (22 % equibiaxial strain) activated NF-κB, enhanced interleukin-8 (IL-8) production, caused cell injury, and reduced cell survival. In contrast, physiologic stretch (10 % strain) did not activate inflammation or cause cell injury. HCA reduced cyclic mechanical stretch-induced NF-κB activation, attenuated IL-8 production, reduced injury, and enhanced survival, in bronchial and alveolar epithelial cells, following shorter (24 h) and longer (120 h) cyclic mechanical stretch. Pre-conditioning with HCA was less effective than when HCA was applied after commencement of cell stretch. HCA prevented the stretch-induced breakdown of the NF-κB cytosolic inhibitor IκBα, while IκBα overexpression "occluded" the effect of HCA. These effects were mediated by a pH-dependent mechanism rather than via CO2 per se. CONCLUSIONS HCA attenuates adverse mechanical stretch-induced epithelial injury and death, via a pH-dependent mechanism that inhibits the canonical NF-κB activation by preventing IκBα breakdown.
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Affiliation(s)
- Shahd Horie
- Discipline of Anaesthesia, School of Medicine, Clinical Sciences Institute, National University of Ireland, Galway, Ireland.,Regenerative Medicine Institute, National University of Ireland, Galway, Ireland
| | - Bilal Ansari
- Discipline of Anaesthesia, School of Medicine, Clinical Sciences Institute, National University of Ireland, Galway, Ireland.,Regenerative Medicine Institute, National University of Ireland, Galway, Ireland
| | - Claire Masterson
- Regenerative Medicine Institute, National University of Ireland, Galway, Ireland.,Department of Anesthesia, Critical Illness and Injury Research Centre, Keenan Research Centre for Biomedical Science, St Michael's Hospital, University of Toronto, Toronto, Canada
| | - James Devaney
- Discipline of Anaesthesia, School of Medicine, Clinical Sciences Institute, National University of Ireland, Galway, Ireland.,Regenerative Medicine Institute, National University of Ireland, Galway, Ireland
| | - Michael Scully
- Discipline of Anaesthesia, School of Medicine, Clinical Sciences Institute, National University of Ireland, Galway, Ireland.,Regenerative Medicine Institute, National University of Ireland, Galway, Ireland
| | - Daniel O'Toole
- Discipline of Anaesthesia, School of Medicine, Clinical Sciences Institute, National University of Ireland, Galway, Ireland.,Regenerative Medicine Institute, National University of Ireland, Galway, Ireland
| | - John G Laffey
- Regenerative Medicine Institute, National University of Ireland, Galway, Ireland. .,Department of Anesthesia, Critical Illness and Injury Research Centre, Keenan Research Centre for Biomedical Science, St Michael's Hospital, University of Toronto, Toronto, Canada.
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