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Daisley H, Acco O, Daisley M, George D, Paul L, James E, Rampersad A, Narinesingh F, Humphrey O, Daisley J, Nathan M. Thrombosis of the vasa vasorum of the large and medium size pulmonary artery and vein leads to pulmonary thromboembolism in COVID-19. Autops Case Rep 2024; 14:e2024491. [PMID: 38803482 PMCID: PMC11129857 DOI: 10.4322/acr.2024.491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Accepted: 04/06/2024] [Indexed: 05/29/2024]
Abstract
The vasa vasorum of the large pulmonary vessels is involved in the pathology of COVID-19. This specialized microvasculature plays a major role in the biology and pathology of the pulmonary vessel walls. We have evidence that thrombosis of the vasa vasorum of the large and medium-sized pulmonary vessels during severe COVID-19 causes ischemia and subsequent death of the pulmonary vasculature endothelium. Subsequent release of thrombi from the vasa interna into the pulmonary circulation and pulmonary embolism generated at the ischemic pulmonary vascular endothelium site, are the central pathophysiological mechanisms in COVID-19 responsible for pulmonary thromboembolism. The thrombosis of the vasa vasorum of the large and medium-sized pulmonary vessels is an internal event leading to pulmonary thromboembolism in COVID-19.
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Affiliation(s)
| | - Oneka Acco
- The University of the West Indies, Mona, Jamaica
| | | | - Dennecia George
- Scarborough General Hospital, Signal Hill, Trinidad and Tobago
| | - Lilly Paul
- The University of the West Indies, Mona, Jamaica
| | - Errol James
- Beacon Plastic and Cosmetic Surgery, Woodbrook, Port of Spain, Trinidad and Tobago
| | | | | | | | - Johann Daisley
- Scarborough General Hospital, Signal Hill, Trinidad and Tobago
| | - Melissa Nathan
- The University of the West Indies, St Augustine, Trinidad and Tobago
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Cao JB, Zhu ST, Huang XS, Wang XY, Wu ML, Li X, Liu FL, Chen L, Zheng YT, Wang JH. Mast cell degranulation-triggered by SARS-CoV-2 induces tracheal-bronchial epithelial inflammation and injury. Virol Sin 2024; 39:309-318. [PMID: 38458399 DOI: 10.1016/j.virs.2024.03.001] [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: 08/11/2023] [Accepted: 02/27/2024] [Indexed: 03/10/2024] Open
Abstract
SARS-CoV-2 infection-induced hyper-inflammation is a key pathogenic factor of COVID-19. Our research, along with others', has demonstrated that mast cells (MCs) play a vital role in the initiation of hyper-inflammation caused by SARS-CoV-2. In previous study, we observed that SARS-CoV-2 infection induced the accumulation of MCs in the peri-bronchus and bronchioalveolar-duct junction in humanized mice. Additionally, we found that MC degranulation triggered by the spike protein resulted in inflammation in alveolar epithelial cells and capillary endothelial cells, leading to subsequent lung injury. The trachea and bronchus are the routes for SARS-CoV-2 transmission after virus inhalation, and inflammation in these regions could promote viral spread. MCs are widely distributed throughout the respiratory tract. Thus, in this study, we investigated the role of MCs and their degranulation in the development of inflammation in tracheal-bronchial epithelium. Histological analyses showed the accumulation and degranulation of MCs in the peri-trachea of humanized mice infected with SARS-CoV-2. MC degranulation caused lesions in trachea, and the formation of papillary hyperplasia was observed. Through transcriptome analysis in bronchial epithelial cells, we found that MC degranulation significantly altered multiple cellular signaling, particularly, leading to upregulated immune responses and inflammation. The administration of ebastine or loratadine effectively suppressed the induction of inflammatory factors in bronchial epithelial cells and alleviated tracheal injury in mice. Taken together, our findings confirm the essential role of MC degranulation in SARS-CoV-2-induced hyper-inflammation and the subsequent tissue lesions. Furthermore, our results support the use of ebastine or loratadine to inhibit SARS-CoV-2-triggered degranulation, thereby preventing tissue damage caused by hyper-inflammation.
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Affiliation(s)
- Jian-Bo Cao
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China; School of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Shu-Tong Zhu
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
| | - Xiao-Shan Huang
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
| | - Xing-Yuan Wang
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
| | - Meng-Li Wu
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
| | - Xin Li
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
| | - Feng-Liang Liu
- Key Laboratory of Bioactive Peptides of Yunnan Province, Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Center for Biosafety Mega-Science, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China
| | - Ling Chen
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
| | - Yong-Tang Zheng
- Key Laboratory of Bioactive Peptides of Yunnan Province, Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Center for Biosafety Mega-Science, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China.
| | - Jian-Hua Wang
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China; University of Chinese Academy of Sciences, Beijing 101408, China.
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Screaton N. Commentary: Pulmonary vasculopathy in post-acute-COVID-19 syndrome-insights from dual-energy CT angiography. Eur Radiol 2023; 33:4698-4699. [PMID: 37145151 PMCID: PMC10161167 DOI: 10.1007/s00330-023-09667-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 03/23/2023] [Accepted: 03/30/2023] [Indexed: 05/06/2023]
Affiliation(s)
- Nick Screaton
- Royal Papworth Hospital NHS Foundation Trust, Cambridge, UK.
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4
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Swenson KE, Hardin CC. Pathophysiology of Hypoxemia in COVID-19 Lung Disease. Clin Chest Med 2023; 44:239-248. [PMID: 37085217 PMCID: PMC9682047 DOI: 10.1016/j.ccm.2022.11.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
As the pandemic has progressed, our understanding of hypoxemia in coronavirus disease 2019 (COVID-19) lung disease has become more nuanced, although much remains to be understood. In this article, we review ventilation-perfusion mismatching in COVID-19 and the evidence to support various biologic theories offered in explanation. In addition, the relationship between hypoxemia and other features of severe COVID-19 lung disease such as respiratory symptoms, radiographic abnormalities, and pulmonary mechanics is explored. Recognizing and understanding hypoxemia in COVID-19 lung disease remains essential for risk stratification, prognostication, and choice of appropriate treatments in severe COVID-19.
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Affiliation(s)
- Kai E Swenson
- Division of Thoracic Surgery and Interventional Pulmonology, Beth Israel Deaconess Medical Center, Boston, MA, USA; Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Bulfinch 148, 55 Fruit Street, Boston, MA 02114, USA.
| | - Charles C Hardin
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Bulfinch 148, 55 Fruit Street, Boston, MA 02114, USA
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Camporota L, Sanderson B, Worrall S, Ostermann M, Barrett NA, Retter A, Busana M, Collins P, Romitti F, Hunt BJ, Rose L, Gattinoni L, Chiumello D. Relationship between D-dimers and dead-space on disease severity and mortality in COVID-19 acute respiratory distress syndrome: A retrospective observational cohort study. J Crit Care 2023; 77:154313. [PMID: 37116437 PMCID: PMC10129848 DOI: 10.1016/j.jcrc.2023.154313] [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: 10/19/2022] [Revised: 03/13/2023] [Accepted: 04/11/2023] [Indexed: 04/30/2023]
Abstract
BACKGROUND Despite its diagnostic and prognostic importance, physiologic dead space fraction is not included in the current ARDS definition or severity classification. ARDS caused by COVID-19 (C-ARDS) is characterized by increased physiologic dead space fraction and hypoxemia. Our aim was to investigate the relationship between dead space indices, markers of inflammation, immunothrombosis, severity and intensive care unit (ICU) mortality. RESULTS Retrospective data including demographics, gas exchange, ventilatory parameters, and respiratory mechanics in the first 24 h of invasive ventilation. Plasma concentrations of D-dimers and ferritin were not significantly different across C-ARDS severity categories. Weak relationships were found between D-dimers and VR (r = 0.07, p = 0.13), PETCO2/PaCO2 (r = -0.1, p = 0.02), or estimated dead space fraction (r = 0.019, p = 0.68). Age, PaO2/FiO2, pH, PETCO2/PaCO2 and ferritin, were independently associated with ICU mortality. We found no association between D-dimers or ferritin and any dead-space indices adjusting for PaO2/FiO2, days of ventilation, tidal volume, and respiratory system compliance. CONCLUSIONS We report no association between dead space and inflammatory markers in mechanically ventilated patients with C-ARDS. Our results support theories suggesting that multiple mechanisms, in addition to immunothrombosis, play a role in the pathophysiology of respiratory failure and degree of dead space in C-ARDS.
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Affiliation(s)
- Luigi Camporota
- Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London SE1 7EH, UK; Centre of Human Applied Physiological Sciences, King's College London, London, UK
| | - Barnaby Sanderson
- Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London SE1 7EH, UK
| | - Stephanie Worrall
- Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London SE1 7EH, UK
| | - Marlies Ostermann
- Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London SE1 7EH, UK
| | - Nicholas A Barrett
- Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London SE1 7EH, UK
| | - Andrew Retter
- Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London SE1 7EH, UK
| | - Mattia Busana
- Department of Anesthesiology, University Medical Center of Göttingen, Germany
| | - Patrick Collins
- Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London SE1 7EH, UK
| | - Federica Romitti
- Department of Anesthesiology, University Medical Center of Göttingen, Germany
| | - Beverley J Hunt
- Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London SE1 7EH, UK
| | - Louise Rose
- Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London SE1 7EH, UK; Florence Nightingale Faculty of Nursing, Midwifery and Palliative Care, King's College London, London, UK
| | - Luciano Gattinoni
- Department of Anesthesiology, University Medical Center of Göttingen, Germany
| | - Davide Chiumello
- Department of Anesthesiology and Intensive Care, ASST Santi e Paolo Hospital, University of Milan, Italy.
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Mohamed I, de Broucker V, Duhamel A, Giordano J, Ego A, Fonne N, Chenivesse C, Remy J, Remy-Jardin M. Pulmonary circulation abnormalities in post-acute COVID-19 syndrome: dual-energy CT angiographic findings in 79 patients. Eur Radiol 2023:10.1007/s00330-023-09618-9. [PMID: 37145145 PMCID: PMC10129318 DOI: 10.1007/s00330-023-09618-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 02/26/2023] [Accepted: 03/06/2023] [Indexed: 05/06/2023]
Abstract
OBJECTIVES To evaluate the frequency and pattern of pulmonary vascular abnormalities in the year following COVID-19. METHODS The study population included 79 patients remaining symptomatic more than 6 months after hospitalization for SARS-CoV-2 pneumonia who had been evaluated with dual-energy CT angiography. RESULTS Morphologic images showed CT features of (a) acute (2/79; 2.5%) and focal chronic (4/79; 5%) PE; and (b) residual post COVID-19 lung infiltration (67/79; 85%). Lung perfusion was abnormal in 69 patients (87.4%). Perfusion abnormalities included (a) perfusion defects of 3 types: patchy defects (n = 60; 76%); areas of non-systematized hypoperfusion (n = 27; 34.2%); and/or PE-type defects (n = 14; 17.7%) seen with (2/14) and without (12/14) endoluminal filling defects; and (b) areas of increased perfusion in 59 patients (74.9%), superimposed on ground-glass opacities (58/59) and vascular tree-in-bud (5/59). PFTs were available in 10 patients with normal perfusion and in 55 patients with abnormal perfusion. The mean values of functional variables did not differ between the two subgroups with a trend toward lower DLCO in patients with abnormal perfusion (74.8 ± 16.7% vs 85.0 ± 8.1). CONCLUSION Delayed follow-up showed CT features of acute and chronic PE but also two types of perfusion abnormalities suggestive of persistent hypercoagulability as well as unresolved/sequelae of microangiopathy. CLINICAL RELEVANCE STATEMENT Despite dramatic resolution of lung abnormalities seen during the acute phase of the disease, acute pulmonary embolism and alterations at the level of lung microcirculation can be identified in patients remaining symptomatic in the year following COVID-19. KEY POINTS • This study demonstrates newly developed proximal acute PE/thrombosis in the year following SARS-CoV-2 pneumonia. • Dual-energy CT lung perfusion identified perfusion defects and areas of increased iodine uptake abnormalities, suggestive of unresolved damage to lung microcirculation. • This study suggests a complementarity between HRCT and spectral imaging for proper understanding of post COVID-19 lung sequelae.
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Affiliation(s)
- Islam Mohamed
- Department of Thoracic Imaging, ULR 2694 METRICS Evaluation des technologies de Santé et des pratiques médicales, Univ. Lille, CHU Lille, F-59000, Lille, France
| | - Virginie de Broucker
- Department of Pulmonary Function Testing, ULR 4483, IMPECS, Univ. Lille, CHU Lille, F-59000, Lille, France
| | - Alain Duhamel
- Department of Biostatistics, ULR 2694 METRICS Evaluation des technologies de santé et des pratiques médicales, Univ. Lille, CHU Lille, F-59000, Lille, France
| | - Jessica Giordano
- Department of Thoracic Imaging, ULR 2694 METRICS Evaluation des technologies de Santé et des pratiques médicales, Univ. Lille, CHU Lille, F-59000, Lille, France
| | - Alice Ego
- Department of Thoracic Imaging, ULR 2694 METRICS Evaluation des technologies de Santé et des pratiques médicales, Univ. Lille, CHU Lille, F-59000, Lille, France
| | - Nicolas Fonne
- Department of Thoracic Imaging, ULR 2694 METRICS Evaluation des technologies de Santé et des pratiques médicales, Univ. Lille, CHU Lille, F-59000, Lille, France
| | - Cécile Chenivesse
- Department of Pulmonology, CNRS, INSERM, Institut Pasteur de Lille, U1019, UMR 9017, Center for Infection and Immunity of Lille (CIIL), Univ. Lille, CHU Lille, F-59000, Lille, France
| | - Jacques Remy
- Department of Thoracic Imaging, ULR 2694 METRICS Evaluation des technologies de Santé et des pratiques médicales, Univ. Lille, CHU Lille, F-59000, Lille, France
| | - Martine Remy-Jardin
- Department of Thoracic Imaging, ULR 2694 METRICS Evaluation des technologies de Santé et des pratiques médicales, Univ. Lille, CHU Lille, F-59000, Lille, France.
- Department of Thoracic Imaging, Heart & Lung Institute, University Hospital Center of Lille, Blvd Jules Leclercq, F-59000, Lille, France.
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7
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Galambos C, Bush D, Abman SH, Caplan M. Prominent Intrapulmonary Shunt Vessels and Altered Lung Development in Infants With Sudden Unexplained Infant Death. J Pediatr 2023; 255:214-219.e1. [PMID: 36336004 DOI: 10.1016/j.jpeds.2022.10.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 09/29/2022] [Accepted: 10/14/2022] [Indexed: 11/06/2022]
Abstract
The purpose of this study was to evaluate intrapulmonary arteriovenous shunts in patients with and without sudden unexplained infant death. We identified open intrapulmonary bronchopulmonary anastomoses as potential pathways for right-to-left shunt in a subset of infants with sudden unexplained infant death.
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Affiliation(s)
- Csaba Galambos
- Department of Pathology and Laboratory Medicine, University of Colorado School of Medicine, Aurora, CO; Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO.
| | - Douglas Bush
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Steven H Abman
- Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO
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8
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Mechanical Power Ratio and Respiratory Treatment Escalation in COVID-19 Pneumonia: A Secondary Analysis of a Prospectively Enrolled Cohort. Anesthesiology 2023; 138:289-298. [PMID: 36571571 PMCID: PMC9904389 DOI: 10.1097/aln.0000000000004465] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND Under the hypothesis that mechanical power ratio could identify the spontaneously breathing patients with a higher risk of respiratory failure, this study assessed lung mechanics in nonintubated patients with COVID-19 pneumonia, aiming to (1) describe their characteristics; (2) compare lung mechanics between patients who received respiratory treatment escalation and those who did not; and (3) identify variables associated with the need for respiratory treatment escalation. METHODS Secondary analysis of prospectively enrolled cohort involving 111 consecutive spontaneously breathing adults receiving continuous positive airway pressure, enrolled from September 2020 to December 2021. Lung mechanics and other previously reported predictive indices were calculated, as well as a novel variable: the mechanical power ratio (the ratio between the actual and the expected baseline mechanical power). Patients were grouped according to the outcome: (1) no-treatment escalation (patient supported in continuous positive airway pressure until improvement) and (2) treatment escalation (escalation of the respiratory support to noninvasive or invasive mechanical ventilation), and the association between lung mechanics/predictive scores and outcome was assessed. RESULTS At day 1, patients undergoing treatment escalation had spontaneous tidal volume similar to those of patients who did not (7.1 ± 1.9 vs. 7.1 ± 1.4 ml/kgIBW; P = 0.990). In contrast, they showed higher respiratory rate (20 ± 5 vs. 18 ± 5 breaths/min; P = 0.028), minute ventilation (9.2 ± 3.0 vs. 7.9 ± 2.4 l/min; P = 0.011), tidal pleural pressure (8.1 ± 3.7 vs. 6.0 ± 3.1 cm H2O; P = 0.003), mechanical power ratio (2.4 ± 1.4 vs. 1.7 ± 1.5; P = 0.042), and lower partial pressure of alveolar oxygen/fractional inspired oxygen tension (174 ± 64 vs. 220 ± 95; P = 0.007). The mechanical power (area under the curve, 0.738; 95% CI, 0.636 to 0.839] P < 0.001), the mechanical power ratio (area under the curve, 0.734; 95% CI, 0.625 to 0.844; P < 0.001), and the pressure-rate index (area under the curve, 0.733; 95% CI, 0.631 to 0.835; P < 0.001) showed the highest areas under the curve. CONCLUSIONS In this COVID-19 cohort, tidal volume was similar in patients undergoing treatment escalation and in patients who did not; mechanical power, its ratio, and pressure-rate index were the variables presenting the highest association with the clinical outcome. EDITOR’S PERSPECTIVE
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9
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Bodmer JL, Weinman J, Veress LA, Galambos C. Obstructive Bronchial Fibrin Cast Formation in COVID-19 Severe Respiratory Failure. Am J Respir Crit Care Med 2023; 207:349-350. [PMID: 36174140 PMCID: PMC9896652 DOI: 10.1164/rccm.202201-0225im] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Affiliation(s)
| | | | - Livia A. Veress
- Department of Pulmonary and Sleep Medicine, University of Colorado School of Medicine and Children’s Hospital Colorado, Aurora, Colorado
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10
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Gattarello S, Camporota L, Gattinoni L. COVID-19 pneumonia: Therapeutic implications of its atypical features. Anaesth Crit Care Pain Med 2023; 42:101182. [PMID: 36481694 PMCID: PMC9742678 DOI: 10.1016/j.accpm.2022.101182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 12/01/2022] [Indexed: 12/12/2022]
Affiliation(s)
- Simone Gattarello
- Anesthesia and Intensive Care Medicine, IRCCS San Raffaele Scientific Institute, Milan, Italy; Department of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany
| | - Luigi Camporota
- Guy's and St Thomas' NHS Foundation Trust, Department of Adult Critical Care, London, United Kingdom
| | - Luciano Gattinoni
- Department of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany.
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Ackermann M, Tafforeau P, Brunet J, Kamp JC, Werlein C, Kühnel MP, Jacob J, Walsh CL, Lee PD, Welte T, Jonigk DD. Comment on: Intrapulmonary shunt and alveolar dead space in a cohort of patients with acute COVID-19 pneumonitis and early recovery. Eur Respir J 2023; 61:2202121. [PMID: 36634926 PMCID: PMC9909205 DOI: 10.1183/13993003.02121-2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 11/13/2022] [Indexed: 01/14/2023]
Abstract
With the greatest interest we read the paper by Harbut et al. [1] describing the role of intrapulmonary shunting and alveolar dead space in patients with acute COVID-19 pneumonitis. We are grateful for them sharing their valuable functional blood and alveolar gas exchange data, pointing out a significant alveolar dead space of nearly 30% in recovered COVID-19 patients, suggesting a persistent pulmonary vascular pathology. Although COVID-19 related hypoxaemia is characterised by preserved oxygen saturation, a ventilation–perfusion mismatch and increased alveolar ventilation/perfusion ratio heterogeneity, the underlying morphological evidence of this physiological enigma has not been fully understood. A compelling explanation for mosaic-like micro-ischaemia in the severe pathology of COVID-19 pneumonitis, which reflects the vasculopathy affecting the secondary lobule and the interlobular septae http://bit.ly/3GwMkII
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Affiliation(s)
- Maximilian Ackermann
- Institute of Pathology and Molecular Pathology, Helios University Clinic Wuppertal, University of Witten/Herdecke, Witten, Germany
- Institute of Functional and Clinical Anatomy, University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany
| | - Paul Tafforeau
- European Synchrotron Radiation Facility, Grenoble, France
| | - Joseph Brunet
- European Synchrotron Radiation Facility, Grenoble, France
| | - Jan C Kamp
- Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Hannover, Germany
| | | | - Mark P Kühnel
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Hannover, Germany
- Institute of Pathology, Hannover Medical School, Hannover, Germany
| | - Joseph Jacob
- Centre for Medical Image Computing, University College London, London, UK
- Department of Radiology, University College London Hospitals NHS Foundation Trust, London, UK
| | - Claire L Walsh
- Department of Mechanical Engineering, University College London, London, UK
| | - Peter D Lee
- Department of Mechanical Engineering, University College London, London, UK
| | - Tobias Welte
- Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Hannover, Germany
| | - Danny D Jonigk
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Hannover, Germany
- Institute of Pathology, University Clinics of RWTH University, Aachen, Germany
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12
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Gattinoni L, Brusatori S, D’Albo R, Maj R, Velati M, Zinnato C, Gattarello S, Lombardo F, Fratti I, Romitti F, Saager L, Camporota L, Busana M. Prone position: how understanding and clinical application of a technique progress with time. ANESTHESIOLOGY AND PERIOPERATIVE SCIENCE 2023; 1:3. [PMCID: PMC9995262 DOI: 10.1007/s44254-022-00002-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Abstract
Historical background The prone position was first proposed on theoretical background in 1974 (more advantageous distribution of mechanical ventilation). The first clinical report on 5 ARDS patients in 1976 showed remarkable improvement of oxygenation after pronation. Pathophysiology The findings in CT scans enhanced the use of prone position in ARDS patients. The main mechanism of the improved gas exchange seen in the prone position is nowadays attributed to a dorsal ventilatory recruitment, with a substantially unchanged distribution of perfusion. Regardless of the gas exchange, the primary effect of the prone position is a more homogenous distribution of ventilation, stress and strain, with similar size of pulmonary units in dorsal and ventral regions. In contrast, in the supine position the ventral regions are more expanded compared with the dorsal regions, which leads to greater ventral stress and strain, induced by mechanical ventilation. Outcome in ARDS The number of clinical studies paralleled the evolution of the pathophysiological understanding. The first two clinical trials in 2001 and 2004 were based on the hypothesis that better oxygenation would lead to a better survival and the studies were more focused on gas exchange than on lung mechanics. The equations better oxygenation = better survival was disproved by these and other larger trials (ARMA trial). However, the first studies provided signals that some survival advantages were possible in a more severe ARDS, where both oxygenation and lung mechanics were impaired. The PROSEVA trial finally showed the benefits of prone position on mortality supporting the thesis that the clinical advantages of prone position, instead of improved gas exchange, were mainly due to a less harmful mechanical ventilation and better distribution of stress and strain. In less severe ARDS, in spite of a better gas exchange, reduced mechanical stress and strain, and improved oxygenation, prone position was ineffective on outcome. Prone position and COVID-19 The mechanisms of oxygenation impairment in early COVID-19 are different than in typical ARDS and relate more on perfusion alteration than on alveolar consolidation/collapse, which are minimal in the early phase. Bronchial shunt may also contribute to the early COVID-19 hypoxemia. Therefore, in this phase, the oxygenation improvement in prone position is due to a better matching of local ventilation and perfusion, primarily caused by the perfusion component. Unfortunately, the conditions for improved outcomes, i.e. a better distribution of stress and strain, are almost absent in this phase of COVID-19 disease, as the lung parenchyma is nearly fully inflated. Due to some contradictory results, further studies are needed to better investigate the effect of prone position on outcome in COVID-19 patients. Graphical Abstract ![]()
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Affiliation(s)
- Luciano Gattinoni
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
| | - Serena Brusatori
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
| | - Rosanna D’Albo
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
| | - Roberta Maj
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
| | - Mara Velati
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
| | - Carmelo Zinnato
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
| | | | - Fabio Lombardo
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
| | - Isabella Fratti
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
| | - Federica Romitti
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
| | - Leif Saager
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
| | - Luigi Camporota
- Department of Adult Critical Care, Guy’s and St Thomas’ NHS Foundation Trust, Health Centre for Human and Applied Physiological Sciences, London, UK
| | - Mattia Busana
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
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13
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Bodmer J, Levin A, Westöö C, van der Have O, Peruzzi N, Tran-Lundmark K, Abman SH, Galambos C. Intrapulmonary Bronchopulmonary Anastomoses in Severe COVID-19-related Acute Respiratory Failure. Am J Respir Crit Care Med 2022; 206:1169-1170. [PMID: 35857856 PMCID: PMC9704825 DOI: 10.1164/rccm.202205-0922le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Jenna Bodmer
- University of Colorado School of MedicineAurora, Colorado
| | - Alice Levin
- University of Colorado School of MedicineAurora, Colorado
| | | | | | | | | | | | - Csaba Galambos
- University of Colorado School of MedicineAurora, Colorado,Corresponding author (e-mail: )
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14
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Bush D, Abman SH, Galambos C. Microvascular Shunts in COVID-19 Pneumonia. Am J Respir Crit Care Med 2022; 206:227-228. [PMID: 35533392 PMCID: PMC9887413 DOI: 10.1164/rccm.202111-2627le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Affiliation(s)
- Douglas Bush
- Icahn School of Medicine at Mount SinaiNew York, New York,Corresponding author (e-mail: )
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15
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Busana M, Camporota L, Gattinoni L. Hypoxaemia in COVID-19: many pieces to a complex puzzle. Eur Respir Rev 2022; 31:31/164/220090. [PMID: 35768129 DOI: 10.1183/16000617.0090-2022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 05/17/2022] [Indexed: 01/13/2023] Open
Affiliation(s)
- Mattia Busana
- Dept of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany
| | - Luigi Camporota
- Dept of Adult Critical Care, Guy's and St Thomas' NHS Foundation Trust, Health Centre for Human and Applied Physiological Sciences, London, UK
| | - Luciano Gattinoni
- Dept of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany
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16
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González-Ruiz FJ, Lazcano-Díaz EA, Baeza Herrera LA, Villalobos-Pedroza M, Toledo Alemán EL, Zuñiga-Salcedo MG, Cruz-Rodríguez C, López-Polanco A, Torres-Pulido A, Sierra-González de Cossio A, Cota Apodaca LA, Manzur-Sandoval D. Endotheliitis, Shunts, and Ventilation–Perfusion Mismatch in Coronavirus Disease 2019: A Literature Review of Disease Mechanisms. Ann Med Surg (Lond) 2022; 78:103820. [PMID: 35600188 PMCID: PMC9112604 DOI: 10.1016/j.amsu.2022.103820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Revised: 05/14/2022] [Accepted: 05/15/2022] [Indexed: 10/27/2022] Open
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17
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Ahmad S, Matalon S, Kuebler WM. Understanding COVID-19 susceptibility and presentation based on its underlying physiology. Physiol Rev 2022; 102:1579-1585. [PMID: 35583178 PMCID: PMC9255705 DOI: 10.1152/physrev.00008.2022] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Shama Ahmad
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States
| | - Sadis Matalon
- Department of Anesthesiology, University of Alabama at Birmingham, Birmingham, Alabama, United States
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18
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Camporota L, Cronin JN, Busana M, Gattinoni L, Formenti F. Pathophysiology of coronavirus-19 disease acute lung injury. Curr Opin Crit Care 2022; 28:9-16. [PMID: 34907979 PMCID: PMC8711311 DOI: 10.1097/mcc.0000000000000911] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
PURPOSE OF REVIEW More than 230 million people have tested positive for severe acute respiratory syndrome-coronavirus-2 infection globally by September 2021. The infection affects primarily the function of the respiratory system, where ∼20% of infected individuals develop coronavirus-19 disease (COVID-19) pneumonia. This review provides an update on the pathophysiology of the COVID-19 acute lung injury. RECENT FINDINGS In patients with COVID-19 pneumonia admitted to the intensive care unit, the PaO2/FiO2 ratio is typically <26.7 kPa (200 mmHg), whereas lung volume appears relatively unchanged. This hypoxaemia is likely determined by a heterogeneous mismatch of pulmonary ventilation and perfusion, mainly associated with immunothrombosis, endothelialitis and neovascularisation. During the disease, lung weight, elastance and dead space can increase, affecting respiratory drive, effort and dyspnoea. In some severe cases, COVID-19 pneumonia may lead to irreversible pulmonary fibrosis. SUMMARY This review summarises the fundamental pathophysiological features of COVID-19 in the context of the respiratory system. It provides an overview of the key clinical manifestations of COVID-19 pneumonia, including gas exchange impairment, altered pulmonary mechanics and implications of abnormal chemical and mechanical stimuli. It also critically discusses the clinical implications for mechanical ventilation therapy.
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Affiliation(s)
- Luigi Camporota
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, King's College London
- Intensive Care Unit, Guy's and St Thomas' NHS Foundation Trust
| | - John N Cronin
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, King's College London
- Department of Anaesthetics, Royal Brompton and Harefield, part of Guy's and St. Thomas' NHS Foundation Trust, London, UK
| | - Mattia Busana
- Department of Anesthesiology, University Medical Center of Göttingen, Göttingen, Germany
| | - Luciano Gattinoni
- Department of Anesthesiology, University Medical Center of Göttingen, Göttingen, Germany
| | - Federico Formenti
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, King's College London
- Nuffield Division of Anaesthetics, University of Oxford, Oxford, UK
- Department of Biomechanics, University of Nebraska Omaha, Omaha, Nebraska, USA
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19
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Schmidt G, Koch C, Wolff M, Sander M. Severe COVID-19 acute respiratory distress syndrome in an adult with single-ventricle physiology: a case report. BMC Anesthesiol 2021; 21:280. [PMID: 34773980 PMCID: PMC8589629 DOI: 10.1186/s12871-021-01504-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 11/03/2021] [Indexed: 11/14/2022] Open
Abstract
Background COVID-19 can induce acute respiratory distress syndrome (ARDS). In patients with congenital heart disease, established treatment strategies are often limited due to their unique cardiovascular anatomy and passive pulmonary perfusion. Case presentation We report the first case of an adult with single-ventricle physiology and bidirectional cavopulmonary shunt who suffered from severe COVID-19 ARDS. Treatment strategies were successfully adopted, and pulmonary vascular resistance was reduced, both medically and through prone positioning, leading to a favorable outcome. Conclusion ARDS treatment strategies including ventilatory settings, prone positioning therapy and cannulation techniques for extracorporeal oxygenation must be adopted carefully considering the passive venous return in patients with single-ventricle physiology.
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Affiliation(s)
- Götz Schmidt
- Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, Justus Liebig University of Giessen, Rudolf-Buchheim-Strasse 7, 35392, Giessen, Germany.
| | - Christian Koch
- Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, Justus Liebig University of Giessen, Rudolf-Buchheim-Strasse 7, 35392, Giessen, Germany
| | - Matthias Wolff
- Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, Justus Liebig University of Giessen, Rudolf-Buchheim-Strasse 7, 35392, Giessen, Germany
| | - Michael Sander
- Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, Justus Liebig University of Giessen, Rudolf-Buchheim-Strasse 7, 35392, Giessen, Germany
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20
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Busana M, Giosa L. The knowns and unknowns of perfusion disturbances in COVID-19 pneumonia. Crit Care 2021; 25:352. [PMID: 34583761 PMCID: PMC8476978 DOI: 10.1186/s13054-021-03742-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 07/23/2021] [Indexed: 11/10/2022] Open
Affiliation(s)
- Mattia Busana
- Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075, Göttingen, Germany.
| | - Lorenzo Giosa
- Department of Surgical Sciences, University of Turin, Turin, Italy
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21
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Cherian R, Chandra B. Time to move away from an oxygen-centric model of pulmonary infarction? THE LANCET. RESPIRATORY MEDICINE 2021; 9:e91. [PMID: 34352218 PMCID: PMC9765706 DOI: 10.1016/s2213-2600(21)00325-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/09/2021] [Accepted: 06/30/2021] [Indexed: 12/24/2022]
Affiliation(s)
- Robin Cherian
- Department of Cardiology, National University Heart Centre Singapore, Singapore 119228
| | - Bharatendu Chandra
- Division of Neurology, National University Hospital, Singapore,Carver College of Medicine, University of Iowa, Iowa City, IA, USA
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