1
|
Lagina M, Valley TS. Diagnosis and Management of Acute Respiratory Failure. Crit Care Clin 2024; 40:235-253. [PMID: 38432694 PMCID: PMC10910131 DOI: 10.1016/j.ccc.2024.01.002] [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] [Indexed: 03/05/2024]
Abstract
Acute hypoxemic respiratory failure is defined by Pao2 less than 60 mm Hg or SaO2 less than 88% and may result from V/Q mismatch, shunt, hypoventilation, diffusion limitation, or low inspired oxygen tension. Acute hypercapnic respiratory failure is defined by Paco2 ≥ 45 mm Hg and pH less than 7.35 and may result from alveolar hypoventilation, increased fraction of dead space, or increased production of carbon dioxide. Early diagnostic maneuvers, such as measurement of SpO2 and arterial blood gas, can differentiate the type of respiratory failure and guide next steps in evaluation and management.
Collapse
Affiliation(s)
- Madeline Lagina
- Division of Pulmonary and Critical Care, Department of Medicine, University of Michigan, Ann Arbor, MI, USA. https://twitter.com/maddielagina
| | - Thomas S Valley
- Division of Pulmonary and Critical Care, Department of Medicine, University of Michigan, Ann Arbor, MI, USA; Center for Bioethics and Social Sciences in Medicine, University of Michigan Medical School, University of Michigan, Ann Arbor, MI, USA; Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor, MI, USA; Department of Veterans Affairs, VA Ann Arbor Healthcare System, Ann Arbor, MI, USA.
| |
Collapse
|
2
|
Jiang L, Chen H, Xie J, Liu L, Yang Y. Prognostic value of time-varying dead space estimates in mechanically ventilated patients with acute respiratory distress syndrome. JOURNAL OF INTENSIVE MEDICINE 2024; 4:187-193. [PMID: 38681797 PMCID: PMC11043632 DOI: 10.1016/j.jointm.2023.08.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 08/09/2023] [Accepted: 08/10/2023] [Indexed: 05/01/2024]
Abstract
Background The dead space fraction (VD/VT) has proven to be a powerful predictor of higher mortality in acute respiratory distress syndrome (ARDS). However, its measurement relies on expired carbon dioxide, limiting its widespread application in clinical practice. Several estimates employing routine variables have been found to be reliable substitutes for direct measurement of VD/VT. In this study, we evaluated the prognostic value of these dead space estimates obtained in the first 7 days following the initiation of ventilation. Methods This retrospective observational study was conducted using data from the Chinese database in intensive care (CDIC). Eligible participants were adult ARDS patients receiving invasive mechanical ventilation while in the intensive care unit between 1st January 2014 and 31st March 2021. We collected data during the first 7 days of ventilation to calculate various dead space estimates, including ventilatory ratio (VR), corrected minute ventilation (V ˙ Ecorr ), VD/VT (Harris-Benedict), VD/VT (Siddiki estimate), and VD/VT (Penn State estimate) longitudinally. A time-dependent Cox model was used to handle these time-varying estimates. Results A total of 392 patients (median age 66 [interquartile range: 55-77] years, median SOFA score 9 [interquartile range: 7-12]) were finally included in our analysis, among whom 132 (33.7%) patients died within 28 days of admission. VR (hazard ratio [HR]=1.04 per 0.1 increase, 95% confidence interval [CI]: 1.01 to 1.06; P=0.013), V ˙ Ecorr (HR=1.08 per 1 increase, 95% CI: 1.04 to 1.12; P < 0.001), VD/VT (Harris-Benedict) (HR=1.25 per 0.1 increase, 95% CI: 1.06 to 1.47; P=0.006), and VD/VT (Penn State estimate) (HR=1.22 per 0.1 increase, 95% CI: 1.04 to 1.44; P=0.017) remained significant after adjustment, while VD/VT (Siddiki estimate) (HR=1.10 per 0.1 increase, 95% CI: 1.00 to 1.20; P=0.058) did not. Given a large number of negative values, VD/VT (Siddiki estimate) and VD/VT (Penn State estimate) were not recommended as reliable substitutes. Long-term exposure to VR >1.3, V ˙ Ecorr >7.53, and VD/VT (Harris-Benedict) >0.59 was independently associated with an increased risk of mortality in ARDS patients. These findings were validated in the fluid and catheter treatment trial (FACTT) database. Conclusions In cases where VD/VT cannot be measured directly, early time-varying estimates of VD/VT such as VR, V ˙ Ecorr , and VD/VT (Harris-Benedict) can be considered for predicting mortality in ARDS patients, offering a rapid bedside application.
Collapse
Affiliation(s)
- Lianlian Jiang
- Jiangsu Provincial Key Laboratory of Critical Care Medicine, Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Hui Chen
- Jiangsu Provincial Key Laboratory of Critical Care Medicine, Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
- Department of Critical Care Medicine, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu, China
| | - Jianfeng Xie
- Jiangsu Provincial Key Laboratory of Critical Care Medicine, Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Ling Liu
- Jiangsu Provincial Key Laboratory of Critical Care Medicine, Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Yi Yang
- Jiangsu Provincial Key Laboratory of Critical Care Medicine, Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| |
Collapse
|
3
|
Mato-Búa R, Prado-Rodríguez A, López-López D, Rama-Maceiras P, Molins-Gauna N, Álvarez-Refojo F. Intraoperative effects of an alveolar recruitment manoeuvre in patients undergoing laparoscopic colon surgery. REVISTA ESPANOLA DE ANESTESIOLOGIA Y REANIMACION 2024; 71:151-159. [PMID: 38452926 DOI: 10.1016/j.redare.2024.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
INTRODUCTION Pulmonary atelectasis is common in patients undergoing laparoscopic abdominal surgery under general anaesthesia, which increases the risk of perioperative respiratory complications. Alveolar recruitment manoeuvres (ARM) are used to open up the lung parenchyma with atelectasis, although the duration of their benefit has not been clearly established. The aim of this study was to determine the effectiveness of an ARM in laparoscopic colon surgery, the duration of response over time, and its haemodynamic impact. METHODS Twenty-five patients undergoing laparoscopic colon surgery were included. After anaesthetic induction and initiation of surgery with pneumoperitoneum, an ARM was performed, and then optimal PEEP determined. Respiratory mechanics and gas exchange variables, and haemodynamic parameters, were analysed before the manoeuvre and periodically over the following 90 min. RESULTS Three patients were excluded for surgical reasons. The alveolar arterial oxygen gradient went from 94.3 (62.3-117.8) mmHg before to 60.7 (29.6-91.0) mmHg after the manoeuvre (P < .05). This difference was maintained during the 90 min of the study. Dynamic compliance of the respiratory system went from 31.3 ml/cmH2O (26.1-39.2) before the manoeuvre to 46.1 ml/cmH2O (37.5-53.5) after the manoeuvre (P < .05). This difference was maintained for 60 min. No significant changes were identified in any of the haemodynamic variables studied. CONCLUSION In patients undergoing laparoscopic colon surgery, performing an intraoperative ARM improves the mechanics of the respiratory system and oxygenation, without associated haemodynamic compromise. The benefit of these manoeuvres lasts for at least one hour.
Collapse
Affiliation(s)
- R Mato-Búa
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain.
| | - A Prado-Rodríguez
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain
| | - D López-López
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain
| | - P Rama-Maceiras
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain
| | - N Molins-Gauna
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain
| | - F Álvarez-Refojo
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain
| |
Collapse
|
4
|
Han HJ, Lee B, Park JD. Individualized estimation of arterial carbon dioxide partial pressure using machine learning in children receiving mechanical ventilation. BMC Pediatr 2024; 24:149. [PMID: 38424493 PMCID: PMC10902995 DOI: 10.1186/s12887-024-04642-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 02/13/2024] [Indexed: 03/02/2024] Open
Abstract
BACKGROUND Measuring arterial partial pressure of carbon dioxide (PaCO2) is crucial for proper mechanical ventilation, but the current sampling method is invasive. End-tidal carbon dioxide (EtCO2) has been used as a surrogate, which can be measured non-invasively, but its limited accuracy is due to ventilation-perfusion mismatch. This study aimed to develop a non-invasive PaCO2 estimation model using machine learning. METHODS This retrospective observational study included pediatric patients (< 18 years) admitted to the pediatric intensive care unit of a tertiary children's hospital and received mechanical ventilation between January 2021 and June 2022. Clinical information, including mechanical ventilation parameters and laboratory test results, was used for machine learning. Linear regression, multilayer perceptron, and extreme gradient boosting were implemented. The dataset was divided into 7:3 ratios for training and testing. Model performance was assessed using the R2 value. RESULTS We analyzed total 2,427 measurements from 32 patients. The median (interquartile range) age was 16 (12-19.5) months, and 74.1% were female. The PaCO2 and EtCO2 were 63 (50-83) mmHg and 43 (35-54) mmHg, respectively. A significant discrepancy of 19 (12-31) mmHg existed between EtCO2 and the measured PaCO2. The R2 coefficient of determination for the developed models was 0.799 for the linear regression model, 0.851 for the multilayer perceptron model, and 0.877 for the extreme gradient boosting model. The correlations with PaCO2 were higher in all three models compared to EtCO2. CONCLUSIONS We developed machine learning models to non-invasively estimate PaCO2 in pediatric patients receiving mechanical ventilation, demonstrating acceptable performance. Further research is needed to improve reliability and external validation.
Collapse
Affiliation(s)
- Hye-Ji Han
- Department of Pediatrics, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, 03080, Republic of Korea
| | - Bongjin Lee
- Department of Pediatrics, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, 03080, Republic of Korea.
- Innovative Medical Technology Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.
| | - June Dong Park
- Department of Pediatrics, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, 03080, Republic of Korea
| |
Collapse
|
5
|
Sardesai N, Hibberd O, Price J, Ercole A, Barnard EBG. Agreement between arterial and end-tidal carbon dioxide in adult patients admitted with serious traumatic brain injury. PLoS One 2024; 19:e0297113. [PMID: 38306331 PMCID: PMC10836696 DOI: 10.1371/journal.pone.0297113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 12/27/2023] [Indexed: 02/04/2024] Open
Abstract
BACKGROUND Low-normal levels of arterial carbon dioxide (PaCO2) are recommended in the acute phase of traumatic brain injury (TBI) to optimize oxygen and CO2 tension, and to maintain cerebral perfusion. End-tidal CO2 (ETCO2) may be used as a surrogate for PaCO2 when arterial sampling is less readily available. ETCO2 may not be an adequate proxy to guide ventilation and the effects on concomitant injury, time, and the impact of ventilatory strategies on the PaCO2-ETCO2 gradient are not well understood. The primary objective of this study was to describe the correlation and agreement between PaCO2 and ETCO2 in intubated adult trauma patients with TBI. METHODS This study was a retrospective analysis of prospectively-collected data of intubated adult major trauma patients with serious TBI, admitted to the East of England regional major trauma centre; 2015-2019. Linear regression and Welch's test were performed on each cohort to assess correlation between paired PaCO2 and ETCO2 at 24-hour epochs for 120 hours after admission. Bland-Altman plots were constructed at 24-hour epochs to assess the PaCO2-ETCO2 agreement. RESULTS 695 patients were included, with 3812 paired PaCO2 and ETCO2 data points. The median PaCO2-ETCO2 gradient on admission was 0.8 [0.4-1.4] kPa, Bland Altman Bias of 0.96, upper (+2.93) and lower (-1.00), and correlation R2 0.149. The gradient was significantly greater in patients with TBI plus concomitant injury, compared to those with isolated TBI (0.9 [0.4-1.5] kPa vs. 0.7 [0.3-1.1] kPa, p<0.05). Across all groups the gradient reduced over time. Patients who died within 30 days had a larger gradient on admission compared to those who survived; 1.2 [0.7-1.9] kPa and 0.7 [0.3-1.2] kPa, p<0.005. CONCLUSIONS Amongst adult patients with TBI, the PaCO2-ETCO2 gradient was greater than previously reported values, particularly early in the patient journey, and when associated with concomitant chest injury. An increased PaCO2-ETCO2 gradient on admission was associated with increased mortality.
Collapse
Affiliation(s)
- Neil Sardesai
- Emmanuel College, University of Cambridge, Cambridge, United Kingdom
- Division of Anaesthesia, Addenbrooke’s Hospital, University of Cambridge, Cambridge, United Kingdom
- Cambridge Centre for Artificial Intelligence in Medicine, Cambridge, United Kingdom
| | - Owen Hibberd
- Emergency and Urgent Care Research in Cambridge (EUReCa), PACE Section, Department of Medicine, University of Cambridge, Cambridge, United Kingdom
| | - James Price
- Emergency and Urgent Care Research in Cambridge (EUReCa), PACE Section, Department of Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Ari Ercole
- Division of Anaesthesia, Addenbrooke’s Hospital, University of Cambridge, Cambridge, United Kingdom
- Cambridge Centre for Artificial Intelligence in Medicine, Cambridge, United Kingdom
| | - Ed B. G. Barnard
- Emergency and Urgent Care Research in Cambridge (EUReCa), PACE Section, Department of Medicine, University of Cambridge, Cambridge, United Kingdom
- Academic Department of Military Emergency Medicine, Royal Centre for Defence Medicine (Research & Clinical Innovation), Birmingham, United Kingdom
| |
Collapse
|
6
|
Collins PD, Giosa L, Camporota L, Barrett NA. State of the art: Monitoring of the respiratory system during veno-venous extracorporeal membrane oxygenation. Perfusion 2024; 39:7-30. [PMID: 38131204 DOI: 10.1177/02676591231210461] [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: 12/23/2023]
Abstract
Monitoring the patient receiving veno-venous extracorporeal membrane oxygenation (VV ECMO) is challenging due to the complex physiological interplay between native and membrane lung. Understanding these interactions is essential to understand the utility and limitations of different approaches to respiratory monitoring during ECMO. We present a summary of the underlying physiology of native and membrane lung gas exchange and describe different tools for titrating and monitoring gas exchange during ECMO. However, the most important role of VV ECMO in severe respiratory failure is as a means of avoiding further ergotrauma. Although optimal respiratory management during ECMO has not been defined, over the last decade there have been advances in multimodal respiratory assessment which have the potential to guide care. We describe a combination of imaging, ventilator-derived or invasive lung mechanic assessments as a means to individualise management during ECMO.
Collapse
Affiliation(s)
- Patrick Duncan Collins
- Department of Critical Care Medicine, Guy's and St Thomas' National Health Service Foundation Trust, London, UK
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, King's College London, London, UK
| | - Lorenzo Giosa
- Department of Critical Care Medicine, Guy's and St Thomas' National Health Service Foundation Trust, London, UK
| | - Luigi Camporota
- Department of Critical Care Medicine, Guy's and St Thomas' National Health Service Foundation Trust, London, UK
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, King's College London, London, UK
| | - Nicholas A Barrett
- Department of Critical Care Medicine, Guy's and St Thomas' National Health Service Foundation Trust, London, UK
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, King's College London, London, UK
| |
Collapse
|
7
|
Yu J, Zhang N, Zhang Z, Fu Y, Gao J, Chen C, Wen Z. Intraoperative partial pressure of arterial carbon dioxide levels and adverse outcomes in patients undergoing lung transplantation. Asian J Surg 2024; 47:380-388. [PMID: 37726182 DOI: 10.1016/j.asjsur.2023.09.016] [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: 01/05/2023] [Revised: 05/11/2023] [Accepted: 09/06/2023] [Indexed: 09/21/2023] Open
Abstract
OBJECTIVE Patients undergoing lung transplantation (LTx) often experience abnormal hypercapnia or hypocapnia. This study aimed to investigate the association between intraoperative PaCO2 and postoperative adverse outcomes in patients undergoing LTx. METHODS We retrospectively reviewed the medical records of 151 patients undergoing LTx. Patients' demographics, perioperative clinical factors, and pre- and intraoperative PaCO2 data after reperfusion were collected and analyzed. Based on the PaCO2 levels, patients were classified into three groups: hypocapnia (≤35 mmHg), normocapnia (35.1-55 mmHg), and hypercapnia (>55 mmHg). Univariate and multivariable logistic regressions were used to identify independent risk factors for postoperative composite adverse events and in-hospital mortality. RESULTS Intraoperative hypercapnia occurred in 69 (45.7%) patients, and hypocapnia in 17 (11.2%). Patients with intraoperative PaCO2 of 35.1-45 mmHg showed a lower incidence of composite adverse events (53.3%) and mortality (6.2%) (P < 0.001). There was no significant difference in composite adverse events and mortality among preoperative PaCO2 groups (P > 0.05). Compared with intraoperative PaCO2 at 35.1-45 mmHg, the risk of composite adverse events in hypercapnia group increased: the adjusted OR was 3.07 (95% confidence interval [CI]: 1.36-6.94; P = 0.007). The risk of death was significantly higher in hypocapnia group than normocapnia group, the adjusted OR was 7.69 (95% CI: 1.68-35.24; P = 0.009). Over ascending ranges of PaCO2, PaCO2 at 55.1-65 mmHg had the strongest association with composite adverse events, the adjusted OR was 6.40 (95% CI: 1.18-34.65; P = 0.031). CONCLUSION These results demonstrate that intraoperative hypercapnia independently predicts postoperative adverse outcomes in patients undergoing LTx. Intraoperative hypocapnia shows predictive value for postoperative in-hospital mortality in LTx.
Collapse
Affiliation(s)
- Jing Yu
- Department of Anesthesiology, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - Nan Zhang
- Department of Anesthesiology, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - Zhiyuan Zhang
- Department of Anesthesiology, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - Yu Fu
- Department of Anesthesiology, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - Jiameng Gao
- Department of Anesthesiology, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - Chang Chen
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China.
| | - Zongmei Wen
- Department of Anesthesiology, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China.
| |
Collapse
|
8
|
Ferraz JFFM, Siuba MT, Krishnan S, Chatburn RL, Mireles-Cabodevila E, Duggal A. Physiologic Markers of Disease Severity in ARDS. Respir Care 2023; 68:1708-1718. [PMID: 37438051 PMCID: PMC10676265 DOI: 10.4187/respcare.11100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 07/06/2023] [Indexed: 07/14/2023]
Abstract
Despite its significant limitations, the PaO2 /FIO2 remains the standard tool to classify disease severity in ARDS. Treatment decisions and research enrollment have depended on this parameter for over 50 years. In addition, several variables have been studied over the past few decades, incorporating other physiologic considerations such as ventilation efficiency, lung mechanics, and right-ventricular performance. This review describes the strengths and limitations of all relevant parameters, with the goal of helping us better understand disease severity and possible future treatment targets.
Collapse
Affiliation(s)
- Joao F F M Ferraz
- Department of Hospital Medicine, Community Care Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio
| | - Matthew T Siuba
- Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio
| | - Sudhir Krishnan
- Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio
| | - Robert L Chatburn
- Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio
| | - Eduardo Mireles-Cabodevila
- Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio
| | - Abhijit Duggal
- Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio.
| |
Collapse
|
9
|
Upchurch CP, Wessman BT, Roberts BW, Fuller BM. Arterial to end-tidal carbon dioxide gap and its characterization in mechanically ventilated adults in the emergency department. Am J Emerg Med 2023; 73:154-159. [PMID: 37683313 DOI: 10.1016/j.ajem.2023.08.042] [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: 05/26/2023] [Revised: 07/23/2023] [Accepted: 08/25/2023] [Indexed: 09/10/2023] Open
Abstract
PURPOSE To evaluate early measurement of the arterial to end-tidal carbon dioxide (PaCO2-PetCO2) gap, a surrogate for physiologic dead space, and its association with clinical outcomes in intubated adults in the emergency department (ED). MATERIALS AND METHODS Observational cohort study of invasively mechanically ventilated adults in an academic medical center (years 2009 to 2016). The association of the PaCO2-PetCO2 gap was evaluated with respect to clinical outcomes; the primary outcome was in-hospital mortality. RESULTS 519 patients were included. 325 (63%) patients had an elevated (>5 mmHg) PaCO2-PetCO2. Patients with an elevated PaCO2-PetCO2 were significantly older, had higher APACHE II scores, more frequently had chronic obstructive pulmonary disease (COPD), had lower arterial oxygen to fraction of inspired oxygen (P:F) ratios, and were more likely to be intubated for exacerbation of COPD or sepsis. There was no difference in mortality for patients with an elevated PaCO2-PetCO2 (25% vs 26%) in unadjusted analysis (p = 0.829) or adjusted analysis (aOR = 0.81 [95% CI: 0.53-1.26]), as compared to a non-elevated PaCO2-PetCO2. CONCLUSIONS An elevated PaCO2-PetCO2 gap is common in the post-intubation period in the ED, but not significantly associated with clinical outcomes.
Collapse
Affiliation(s)
- Cameron P Upchurch
- Department of Medicine, Division of Pulmonary and Critical Care. MSC 8052-43-14. Washington University School of Medicine. 660 S. Euclid Ave. St. Louis, MO 63110, USA.
| | - Brian T Wessman
- Department of Emergency Medicine 660 S. Euclid Ave Campus Box 8072 St. Louis, MO 63110, USA; Department of Anesthesiology, Division of Critical Care 660 S. Euclid Ave. St. Louis, MO 63110, USA
| | - Brian W Roberts
- Cooper University Hospital Department of Emergency Medicine One Cooper Plaza Camden, NJ 08103, USA
| | - Brian M Fuller
- Department of Emergency Medicine 660 S. Euclid Ave Campus Box 8072 St. Louis, MO 63110, USA; Department of Anesthesiology, Division of Critical Care 660 S. Euclid Ave. St. Louis, MO 63110, USA
| |
Collapse
|
10
|
Jayasimhan D, Chieng J, Kolbe J, Sidebotham DA. Dead-Space Ventilation Indices and Mortality in Acute Respiratory Distress Syndrome: A Systematic Review and Meta-Analysis. Crit Care Med 2023; 51:1363-1372. [PMID: 37204257 DOI: 10.1097/ccm.0000000000005921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
OBJECTIVES Acute respiratory distress syndrome (ARDS) is associated with high ventilation-perfusion heterogeneity and dead-space ventilation. However, whether the degree of dead-space ventilation is associated with outcomes is uncertain. In this systematic review and meta-analysis, we evaluated the ability of dead-space ventilation measures to predict mortality in patients with ARDS. DATA SOURCES MEDLINE, CENTRAL, and Google Scholar from inception to November 2022. STUDY SELECTION Studies including adults with ARDS reporting a dead-space ventilation index and mortality. DATA EXTRACTION Two reviewers independently identified eligible studies and extracted data. We calculated pooled effect estimates using a random effects model for both adjusted and unadjusted results. The quality and strength of evidence were assessed using the Quality in Prognostic Studies and Grading of Recommendations, Assessment, Development, and Evaluation, respectively. DATA SYNTHESIS We included 28 studies in our review, 21 of which were included in our meta-analysis. All studies had a low risk of bias. A high pulmonary dead-space fraction was associated with increased mortality (odds ratio [OR], 3.52; 95% CI, 2.22-5.58; p < 0.001; I2 = 84%). After adjusting for other confounding variables, every 0.05 increase in pulmonary-dead space fraction was associated with an increased odds of death (OR, 1.23; 95% CI, 1.13-1.34; p < 0.001; I2 = 57%). A high ventilatory ratio was also associated with increased mortality (OR, 1.55; 95% CI, 1.33-1.80; p < 0.001; I2 = 48%). This association was independent of common confounding variables (OR, 1.33; 95% CI, 1.12-1.58; p = 0.001; I2 = 66%). CONCLUSIONS Dead-space ventilation indices were independently associated with mortality in adults with ARDS. These indices could be incorporated into clinical trials and used to identify patients who could benefit from early institution of adjunctive therapies. The cut-offs identified in this study should be prospectively validated.
Collapse
Affiliation(s)
- Dilip Jayasimhan
- Cardiothoracic and Vascular Intensive Care Unit, Te Whatu Ora Te Toka Tumai Auckland, Auckland, New Zealand
- Respiratory Services, Te Whatu Ora Te Toka Tumai Auckland, Auckland, New Zealand
| | - Jennifer Chieng
- Respiratory Services, Te Whatu Ora Te Toka Tumai Auckland, Auckland, New Zealand
| | - John Kolbe
- Respiratory Services, Te Whatu Ora Te Toka Tumai Auckland, Auckland, New Zealand
- Department of Medicine, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - David A Sidebotham
- Cardiothoracic and Vascular Intensive Care Unit, Te Whatu Ora Te Toka Tumai Auckland, Auckland, New Zealand
- Department of Medicine, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| |
Collapse
|
11
|
Chen W, Shu K, Cai C, Ding J, Zhang X, Zhang W, Wang K. Prognostic value and immune landscapes of immunogenic cell death-related lncRNAs in hepatocellular carcinoma. Biosci Rep 2023; 43:BSR20230634. [PMID: 37584192 PMCID: PMC10500227 DOI: 10.1042/bsr20230634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 05/31/2023] [Accepted: 08/15/2023] [Indexed: 08/17/2023] Open
Abstract
BACKGROUND Both immunogenic cell death (ICD) and long noncoding RNAs (lncRNAs) are strongly associated with tumor development, but the mechanism of action of ICD-associated lncRNAs in hepatocellular carcinoma (HCC) remains unclear. METHODS We collected data from 365 HCC patients from The Cancer Genome Atlas (TCGA) database. We formulated a prognostic signature of ICD-associated lncRNAs and a nomogram to predict prognosis. To explore the potential mechanisms and provide clinical guidance, survival analysis, enrichment analysis, tumor microenvironment analysis, tumor mutation burden (TMB), and drug sensitivity prediction were conducted based on the subgroups obtained from the risk score. RESULTS A prognostic signature of seven ICD-associated lncRNAs was constructed. Kaplan-Meier (K-M) survival curves showed a more unfavorable outcome in high-risk patients. The nomogram had a higher predictive value than the nomogram constructed without the risk model. Enrichment analysis confirmed that risk lncRNAs were closely associated with cell proliferation and mitosis. Most of the immune checkpoints currently used in therapy (e.g., PDCD1 and CTLA4) appeared to be elevated in high-risk patients. Tumor microenvironment analysis showed differential expression of lymphocytes (including natural killer cells, regulatory T cells, etc.) in the high-risk group. TMB had a higher incidence of mutations in the high-risk group (P=0.004). Chemotherapy drug sensitivity prediction provides effective guidelines for individual therapy. RT-qPCR of human HCC tissues verified the accuracy of the model. CONCLUSION We constructed an effective prognostic signature for patients with HCC using seven ICD-lncRNAs, which provides guidance for the prognostic assessment and personalized treatment of patients.
Collapse
Affiliation(s)
- Wanying Chen
- Department of Thoracic Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
- Jiangxi Medical College, Nanchang University, Nanchang 330006, China
| | - Kexin Shu
- Jiangxi Medical College, Nanchang University, Nanchang 330006, China
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Chenxi Cai
- Jiangxi Medical College, Nanchang University, Nanchang 330006, China
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Jiatong Ding
- Jiangxi Medical College, Nanchang University, Nanchang 330006, China
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Xin Zhang
- Department of Thoracic Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Wenxiong Zhang
- Department of Thoracic Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Kang Wang
- Department of Traditional Chinese Medicine, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
| |
Collapse
|
12
|
Gradel KO. Interpretations of the Role of Plasma Albumin in Prognostic Indices: A Literature Review. J Clin Med 2023; 12:6132. [PMID: 37834777 PMCID: PMC10573484 DOI: 10.3390/jcm12196132] [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: 07/07/2023] [Revised: 09/18/2023] [Accepted: 09/21/2023] [Indexed: 10/15/2023] Open
Abstract
This review assesses how publications interpret factors that influence the serum or plasma albumin (PA) level in prognostic indices, focusing on inflammation and nutrition. On PubMed, a search for "albumin AND prognosis" yielded 23,919 results. From these records, prognostic indices were retrieved, and their names were used as search strings on PubMed. Indices found in 10 or more original research articles were included. The same search strings, restricted to "Review" or "Systematic review", retrieved yielded on the indices. The data comprised the 10 latest original research articles and up to 10 of the latest reviews. Thirty indices had 294 original research articles (6 covering two indices) and 131 reviews, most of which were from recent years. A total of 106 articles related the PA level to inflammation, and 136 related the PA level to nutrition. For the reviews, the equivalent numbers were 54 and 65. In conclusion, more publications mention the PA level as a marker of nutrition rather than inflammation. This is in contrast to several general reviews on albumin and nutritional guidelines, which state that the PA level is a marker of inflammation but not nutrition. Hypoalbuminemia should prompt clinicians to focus on the inflammatory aspects in their patients.
Collapse
Affiliation(s)
- Kim Oren Gradel
- Center for Clinical Epidemiology, Odense University Hospital, 5000 Odense, Denmark; ; Tel.: +45-21-15-80-85
- Research Unit of Clinical Epidemiology, Department of Clinical Research, University of Southern Denmark, 5000 Odense, Denmark
| |
Collapse
|
13
|
Juschten J, Tuinman PR, de Grooth HJ. Harmonization of Reported Baseline Characteristics Is a Prerequisite for Progress in Acute Respiratory Distress Syndrome Research. Ann Am Thorac Soc 2023; 20:947-950. [PMID: 37166835 DOI: 10.1513/annalsats.202212-1038ip] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 02/27/2023] [Indexed: 03/03/2023] Open
Affiliation(s)
- Jenny Juschten
- Department of Anesthesiology and
- Department of Intensive Care, Amsterdam University Medical Center, Location VUmc, Amsterdam, the Netherlands
| | - Pieter R Tuinman
- Department of Intensive Care, Amsterdam University Medical Center, Location VUmc, Amsterdam, the Netherlands
| | - Harm-Jan de Grooth
- Department of Intensive Care, Amsterdam University Medical Center, Location VUmc, Amsterdam, the Netherlands
| |
Collapse
|
14
|
Thacker J, Stroud A, Carge M, Baldwin C, Shahait AD, Tyburski J, Dolman H, Tarras S. Utility of arterial CO2 - End-tidal CO2 gap as a mortality indicator in the surgical ICU. Am J Surg 2022. [DOI: 10.1016/j.amjsurg.2022.10.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
15
|
Correlación entre el aumento del dímero D en sangre con el espacio muerto en pacientes con COVID-19 y síndrome de dificultad respiratoria aguda. ACTA COLOMBIANA DE CUIDADO INTENSIVO 2022. [PMCID: PMC9296507 DOI: 10.1016/j.acci.2022.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Introducción Desde diciembre de 2019, un número de casos de neumonía por síndrome respiratorio agudo severo (SARS) CoV2/COVID-19 en Wuhan, China, se identificaron como causa de insuficiencia respiratoria aguda, y se propagaron por el mundo a gran velocidad. Debido al gran número de casos y a la necesidad de entender más esta condición, surge la necesidad de identificar herramientas que gradúen la intensidad y el pronóstico vital de los pacientes. El objetivo de este estudio es determinar la relación entre el espacio muerto medido por capnografía volumétrica o por ventilatory ratio y el aumento de los niveles de dímero D en los pacientes con diagnóstico de neumonía por COVID-19 y que cumplan los criterios de Berlín para síndrome de dificultad respiratoria aguda (SDRA). Materiales y métodos Se realizó un estudio observacional de una cohorte prospectiva, monocéntrico, sobre el uso de dímero D y la correlación con el espacio muerto. Se incluyeron adultos mayores de 18 años con diagnóstico de neumonía por COVID-19 y SDRA hospitalizados en las unidades de cuidados intensivos del Hospital Santa Clara en Bogotá, Colombia, desde agosto de 2020 hasta julio de 2021. Resultados El estudio incluyó 67 pacientes, con diagnóstico de SARS-CoV-2 confirmado en todos ellos, no se encontró asociación entre dímero D y espacio muerto en el día 1 y 3 de la hospitalización en la UCI. Conclusión El dímero D no se correlaciona con el aumento del espacio muerto en nuestro estudio y tampoco se asoció con los desenlaces clínicos relevantes en los pacientes con SDRA.
Collapse
|
16
|
Harutyunyan G, Harutyunyan V, Harutyunyan G, Sánchez Gimeno A, Cherkezyan A, Petrosyan S, Gnuni A, Soghomonyan S. Ventilation/perfusion mismatch is not the sole reason for hypoxaemia in early stage COVID-19 patients. Eur Respir Rev 2022; 31:31/164/210277. [PMID: 35768132 PMCID: PMC9488915 DOI: 10.1183/16000617.0277-2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 04/07/2022] [Indexed: 12/27/2022] Open
Abstract
It was a pleasure reading the work of Gattinoniet al. [1] dedicated to the pathophysiological mechanisms of hypoxaemia observed in coronavirus disease 2019 (COVID-19) patients. The authors recommend treating the hypoxaemia observed in the early stages of COVID-19 based on ventilation/perfusion (VʹA/Qʹ) mismatch. The transformation of alveolar microcirculation to a peripheral circulation type in COVID-19 patients leads to important decreases in haemoglobin–oxygen affinity and provokes biochemical shunthttps://bit.ly/3jE53pe
Collapse
Affiliation(s)
| | | | - Garnik Harutyunyan
- Universitat De València, Faculty of Pharmacy, Burjassot, Valencia, Spain
| | | | - Artur Cherkezyan
- Erebouni medical center, Dept of Anesthesiology, Yerevan, Armenia
| | - Spartak Petrosyan
- National Center for Infection Diseases (Ministry of Health, Republic of Armenia), Yerevan, Armenia
| | - Anatoli Gnuni
- Ministry of Health, Republic of Armenia, Yerevan, Armenia
| | | |
Collapse
|
17
|
Kamenshchikov NO, Berra L, Carroll RW. Therapeutic Effects of Inhaled Nitric Oxide Therapy in COVID-19 Patients. Biomedicines 2022; 10:biomedicines10020369. [PMID: 35203578 PMCID: PMC8962307 DOI: 10.3390/biomedicines10020369] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 01/26/2022] [Accepted: 01/26/2022] [Indexed: 01/08/2023] Open
Abstract
The global COVID-19 pandemic has become the largest public health challenge of recent years. The incidence of COVID-19-related acute hypoxemic respiratory failure (AHRF) occurs in up to 15% of hospitalized patients. Antiviral drugs currently available to clinicians have little to no effect on mortality, length of in-hospital stay, the need for mechanical ventilation, or long-term effects. Inhaled nitric oxide (iNO) administration is a promising new non-standard approach to directly treat viral burden while enhancing oxygenation. Along with its putative antiviral affect in COVID-19 patients, iNO can reduce inflammatory cell-mediated lung injury by inhibiting neutrophil activation, lowering pulmonary vascular resistance and decreasing edema in the alveolar spaces, collectively enhancing ventilation/perfusion matching. This narrative review article presents recent literature on the iNO therapy use for COVID-19 patients. The authors suggest that early administration of the iNO therapy may be a safe and promising approach for the treatment of COVID-19 patients. The authors also discuss unconventional approaches to treatment, continuous versus intermittent high-dose iNO therapy, timing of initiation of therapy (early versus late), and novel delivery systems. Future laboratory and clinical research is required to define the role of iNO as an adjunct therapy against bacterial, viral, and fungal infections.
Collapse
Affiliation(s)
- Nikolay O. Kamenshchikov
- Cardiology Research Institute, Tomsk National Research Medical Center, Russian Academy of Sciences, 634012 Tomsk, Russia
- Correspondence:
| | - Lorenzo Berra
- Department of Anaesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Boston, MA 02114, USA;
- Department of Anaesthesia, Harvard Medical School, Boston, MA 02115, USA;
| | - Ryan W. Carroll
- Department of Anaesthesia, Harvard Medical School, Boston, MA 02115, USA;
- Division of Pediatric Critical Care Medicine, Massachusetts General Hospital, Boston, MA 02114, USA
| |
Collapse
|