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Franchineau G, Jonkman AH, Piquilloud L, Yoshida T, Costa E, Rozé H, Camporota L, Piraino T, Spinelli E, Combes A, Alcala GC, Amato M, Mauri T, Frerichs I, Brochard LJ, Schmidt M. Electrical Impedance Tomography to Monitor Hypoxemic Respiratory Failure. Am J Respir Crit Care Med 2024; 209:670-682. [PMID: 38127779 DOI: 10.1164/rccm.202306-1118ci] [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: 07/01/2023] [Accepted: 12/20/2023] [Indexed: 12/23/2023] Open
Abstract
Hypoxemic respiratory failure is one of the leading causes of mortality in intensive care. Frequent assessment of individual physiological characteristics and delivery of personalized mechanical ventilation (MV) settings is a constant challenge for clinicians caring for these patients. Electrical impedance tomography (EIT) is a radiation-free bedside monitoring device that is able to assess regional lung ventilation and changes in aeration. With real-time tomographic functional images of the lungs obtained through a thoracic belt, clinicians can visualize and estimate the distribution of ventilation at different ventilation settings or following procedures such as prone positioning. Several studies have evaluated the performance of EIT to monitor the effects of different MV settings in patients with acute respiratory distress syndrome, allowing more personalized MV. For instance, EIT could help clinicians find the positive end-expiratory pressure that represents a compromise between recruitment and overdistension and assess the effect of prone positioning on ventilation distribution. The clinical impact of the personalization of MV remains to be explored. Despite inherent limitations such as limited spatial resolution, EIT also offers a unique noninvasive bedside assessment of regional ventilation changes in the ICU. This technology offers the possibility of a continuous, operator-free diagnosis and real-time detection of common problems during MV. This review provides an overview of the functioning of EIT, its main indices, and its performance in monitoring patients with acute respiratory failure. Future perspectives for use in intensive care are also addressed.
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Affiliation(s)
- Guillaume Franchineau
- Service de Medecine Intensive Reanimation, Centre Hospitalier Intercommunal de Poissy-Saint-Germain-en-Laye, Poissy, France
| | - Annemijn H Jonkman
- Department of Intensive Care Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Lise Piquilloud
- Adult Intensive Care Unit, Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Takeshi Yoshida
- Department of Anesthesiology and Intensive Care Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Eduardo Costa
- Pulmonary Division, Cardiopulmonary Department, Heart Institute, University of São Paulo, São Paulo, Brazil
| | - Hadrien Rozé
- Department of Thoraco-Abdominal Anesthesiology and Intensive Care, Bordeaux University Hospital, University of Bordeaux, Bordeaux, France
- Réanimation Polyvalente, Centre Hospitalier Côte Basque, Bayonne, France
| | - Luigi Camporota
- Health Centre for Human and Applied Physiological Sciences, Department of Adult Critical Care, Guy's and St Thomas' National Health Service Foundation Trust, London, United Kingdom
| | - Thomas Piraino
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, Unity Health Toronto, Toronto, Ontario, Canada
- Division of Critical Care, Department of Anesthesia, McMaster University, Hamilton, Ontario, Canada
| | - Elena Spinelli
- Department of Anesthesia, Critical Care and Emergency, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Alain Combes
- Sorbonne Université, Groupe de Recherche Clinique 30, Réanimation et Soins Intensifs du Patient en Insuffisance Respiratoire Aigüe, UMRS_1166-ICAN, Institute of Cardiometabolism and Nutrition, Service de Médecine Intensive - Réanimation, Assistance Publique-Hôpitaux de Paris (APHP) Hôpital Pitié-Salpêtrière, Paris, France
| | - Glasiele C Alcala
- Pulmonary Division, Cardiopulmonary Department, Heart Institute, University of São Paulo, São Paulo, Brazil
| | - Marcelo Amato
- Pulmonary Division, Cardiopulmonary Department, Heart Institute, University of São Paulo, São Paulo, Brazil
| | - Tommaso Mauri
- Department of Anesthesia, Critical Care and Emergency, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
- Department of Pathophysiology and Transplants, University of Milan, Milan, Italy
| | - Inéz Frerichs
- Department of Anesthesiology and Intensive Care Medicine, University Medical Centre of Schleswig-Holstein Campus Kiel, Kiel, Germany; and
| | - Laurent J Brochard
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, Unity Health Toronto, Toronto, Ontario, Canada
- Interdepartmental Division of Critical Care, University of Toronto, Toronto, Ontario, Canada
| | - Matthieu Schmidt
- Sorbonne Université, Groupe de Recherche Clinique 30, Réanimation et Soins Intensifs du Patient en Insuffisance Respiratoire Aigüe, UMRS_1166-ICAN, Institute of Cardiometabolism and Nutrition, Service de Médecine Intensive - Réanimation, Assistance Publique-Hôpitaux de Paris (APHP) Hôpital Pitié-Salpêtrière, Paris, France
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Toumi R, Ennouri E, Boussarsar M. Letter on "Physiological effects of high-flow nasal cannula oxygen therapy after extubation: a randomized crossover study". Ann Intensive Care 2024; 14:8. [PMID: 38206542 PMCID: PMC10784431 DOI: 10.1186/s13613-023-01234-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 12/18/2023] [Indexed: 01/12/2024] Open
Affiliation(s)
- Radhouane Toumi
- Medical Intensive Care Unit. Research Laboratory N° LR12SP09, Heart Failure, Farhat Hached University Hospital, Sousse, Tunisia
- Faculty of Medicine of Sousse, University of Sousse, Sousse, Tunisia
| | - Emna Ennouri
- Medical Intensive Care Unit. Research Laboratory N° LR12SP09, Heart Failure, Farhat Hached University Hospital, Sousse, Tunisia
- Faculty of Medicine of Sousse, University of Sousse, Sousse, Tunisia
| | - Mohamed Boussarsar
- Medical Intensive Care Unit. Research Laboratory N° LR12SP09, Heart Failure, Farhat Hached University Hospital, Sousse, Tunisia.
- Faculty of Medicine of Sousse, University of Sousse, Sousse, Tunisia.
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Öner Ö, Ergan B, Kizil AS, Gurkok MC, Dugral E, Gökmen N. Investigation of high flow nasal cannule efficiency with electric impedance tomography based parameters in COVID-19 adults patients: a retrospective study. PeerJ 2023; 11:e15555. [PMID: 37465153 PMCID: PMC10351510 DOI: 10.7717/peerj.15555] [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: 11/04/2022] [Accepted: 05/23/2023] [Indexed: 07/20/2023] Open
Abstract
Background/Aim This study aimed to investigate the effects of oxygen therapy using a high flow nasal cannula (HFNC) on patients diagnosed with COVID-19 Acute Respiratory Distress Syndrome (C-ARDS) by utilizing electrical impedance tomography (EIT)-based parameters. Materials and Methods Oxygen therapy was administered to the patients at two different flow rates and two different positions: T0-baseline measurements were taken in the supine position before any therapy was initiated. T1-HFNC was administered in the supine position with a flow rate of 30 L/min. T2-HFNC was administered in the supine position with a flow rate of 50 L/min. T3-HFNC was administered in the prone position with a flow rate of 30 L/min. T4-HFNC was administered in the prone position with a flow rate of 50 L/min. EIT-based parameters (global inhomogeneity index (GI index), center of ventilation (CoV), regional ventilation delay index (RVD index), region of interest ratio (ROI ratio)), as well as respiratory and hemodynamic parameters of the patients, were recorded from the database. Results A total of twenty patients were included in this retrospective observational study. The mean age of the included patients was 64.3 ± 10.6 years. Statistically significant differences were observed in the measurements of GI index, CoV, RVD index, ROI ratio, PaO2/FiO2 ratio, respiratory rate, and mean arterial pressure parameters across different time intervals (p < 0.005). Pairwise comparisons of EIT parameters and measurements of respiratory and hemodynamic parameters at five different time points revealed statistically significant differences. For the GI index, significant differences were observed between the mean measurements taken at T0-T1, T0-T2, T0-T3, T0-T4, T1-T3, T1-T4, T2-T3, T2-T4, and T3-T4 time intervals (p < 0.05). Regarding CoV, significant differences were found between the mean measurements taken at T0-T3, T1-T3, T2-T3, and T3-T4 time intervals (p < 0.05). Additionally, for the ROI ratio, significant differences were observed between the measurement averages taken at each time interval (p < 0.05). Conclusion Our findings suggest that prone positioning during the management of C-ARDS patients leads to improved lung homogeneity, as indicated by EIT parameters. However, further research is required to enhance the visualization of ventilation using EIT.
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Affiliation(s)
- Özlem Öner
- Faculty of Medicine Department of Anesthesiology and Reanimation, Subdivision of Critical Care Medicine, Dokuz Eylül University, İzmir, Turkey
| | - Begum Ergan
- University Faculty of Medicine Department of Pulmonary, Subdivision of Critical Care, Dokuz Eylül University, İzmir, Turkey
| | - Ayse Sezin Kizil
- Faculty of Medicine Department of Anesthesiology and Reanimation, Subdivision of Critical Care Medicine, Dokuz Eylül University, İzmir, Turkey
| | - Mehmet Cagatay Gurkok
- Faculty of Medicine Department of General Surgery, Subdivision of Critical Care Medicine, Dokuz Eylül University, İzmir, Turkey
| | - Esra Dugral
- Pulmonologist and Physiology Specialist, İzmir Katip Çelebi Research and Training Hospital, İzmir, Turkey
| | - Necati Gökmen
- Faculty of Medicine Department of Anesthesiology and Reanimation, Subdivision of Critical Care Medicine, Dokuz Eylül University, İzmir, Turkey
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Yang L, Li Z, Dai M, Fu F, Möller K, Gao Y, Zhao Z. Optimal machine learning methods for prediction of high-flow nasal cannula outcomes using image features from electrical impedance tomography. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2023; 238:107613. [PMID: 37209577 DOI: 10.1016/j.cmpb.2023.107613] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 04/26/2023] [Accepted: 05/15/2023] [Indexed: 05/22/2023]
Abstract
BACKGROUND High-flow nasal cannula (HNFC) is able to provide ventilation support for patients with hypoxic respiratory failure. Early prediction of HFNC outcome is warranted, since failure of HFNC might delay intubation and increase mortality rate. Existing methods require a relatively long period to identify the failure (approximately 12 h) and electrical impedance tomography (EIT) may help identify the patient's respiratory drive during HFNC. OBJECTIVES This study aimed to investigate a proper machine-learning model to predict HFNC outcomes promptly by EIT image features. METHODS The Z-score standardization method was adopted to normalize the samples from 43 patients who underwent HFNC and six EIT features were selected as model input variables through the random forest feature selection method. Machine-learning methods including discriminant, ensembles, k-nearest neighbour (KNN), artificial neural network (ANN), support vector machine (SVM), AdaBoost, xgboost, logistic, random forest, bernoulli bayes, gaussian bayes and gradient-boosted decision trees (GBDT) were used to build prediction models with the original data and balanced data proceeded by the synthetic minority oversampling technique. RESULTS Prior to data balancing, an extremely low specificity (less than 33.33%) as well as a high accuracy in the validation data set were observed in all the methods. After data balancing, the specificity of KNN, xgboost, random forest, GBDT, bernoulli bayes and AdaBoost significantly reduced (p<0.05) while the area under curve did not improve considerably (p>0.05); and the accuracy and recall decreased significantly (p<0.05). CONCLUSIONS The xgboost method showed better overall performance for balanced EIT image features, which may be considered as the ideal machine learning method for early prediction of HFNC outcomes.
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Affiliation(s)
- Lin Yang
- Department of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Zhe Li
- Department of Critical Care Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Meng Dai
- Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.
| | - Feng Fu
- Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China
| | - Knut Möller
- Institute of Technical Medicine, Furtwangen University, Villingen-Schwenningen, Germany
| | - Yuan Gao
- Department of Critical Care Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Zhanqi Zhao
- Institute of Technical Medicine, Furtwangen University, Villingen-Schwenningen, Germany
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He Y, Zhuang X, Liu H, Ma W. Comparison of the efficacy and comfort of high-flow nasal cannula with different initial flow settings in patients with acute hypoxemic respiratory failure: a systematic review and network meta-analysis. J Intensive Care 2023; 11:18. [PMID: 37165464 PMCID: PMC10171174 DOI: 10.1186/s40560-023-00667-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 05/01/2023] [Indexed: 05/12/2023] Open
Abstract
BACKGROUND High-flow nasal cannula (HFNC) has been proven effective in improving patients with acute hypoxemic respiratory failure (AHRF), but a discussion of its use for initial flow settings still need to be provided. We aimed to compare the effectiveness and comfort evaluation of HFNC with different initial flow settings in patients with AHRF. METHODS Studies published by October 10, 2022, were searched exhaustively in PubMed, Embase, Web of Science, Cochrane Library (CENTRAL), and the China National Knowledge Infrastructure (CNKI) database. Network meta-analysis (NMA) was performed with STATA 17.0 and R software (version 4.2.1). A Bayesian framework was applied for this NMA. Comparisons of competing models based on the deviance information criterion (DIC) were used to select the best model for NMA. The primary outcome is the intubation at day 28. Secondary outcomes included short-term and long-term mortality, comfort score, length of ICU or hospital stay, and 24-h PaO2/FiO2. RESULTS This NMA included 23 randomized controlled trials (RCTs) with 5774 patients. With NIV as the control, the HFNC_high group was significantly associated with lower intubation rates (odds ratio [OR] 0.72 95% credible interval [CrI] 0.56 to 0.93; moderate quality evidence) and short-term mortality (OR 0.81 95% CrI 0.69 to 0.96; moderate quality evidence). Using HFNC_Moderate (Mod) group (mean difference [MD] - 1.98 95% CrI -3.98 to 0.01; very low quality evidence) as a comparator, the HFNC_Low group had a slight advantage in comfort scores but no statistically significant difference. Of all possible interventions, the HFNC_High group had the highest probability of being the best in reducing intubation rates (73.04%), short-term (82.74%) and long-term mortality (67.08%). While surface under the cumulative ranking curve value (SUCRA) indicated that the HFNC_Low group had the highest probability of being the best in terms of comfort scores. CONCLUSIONS The high initial flow settings (50-60 L/min) performed better in decreasing the occurrence of intubation and mortality, albeit with poor comfort scores. Treatment of HFNC for AHRF patients ought to be initiated from moderate flow rates (30-40 L/min), and individualized flow settings can make HFNC more sensible in clinical practice.
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Affiliation(s)
- Yuewen He
- Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, People's Republic of China
- Department of Anesthesiology, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou, Guangdong, 510405, People's Republic of China
| | - Xuhui Zhuang
- Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, People's Republic of China
- Department of Anesthesiology, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou, Guangdong, 510405, People's Republic of China
| | - Hao Liu
- Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, People's Republic of China
- Department of Anesthesiology, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou, Guangdong, 510405, People's Republic of China
| | - Wuhua Ma
- Department of Anesthesiology, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou, Guangdong, 510405, People's Republic of China.
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Li J, Albuainain FA, Tan W, Scott JB, Roca O, Mauri T. The effects of flow settings during high-flow nasal cannula support for adult subjects: a systematic review. Crit Care 2023; 27:78. [PMID: 36855198 PMCID: PMC9974062 DOI: 10.1186/s13054-023-04361-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 02/15/2023] [Indexed: 03/02/2023] Open
Abstract
BACKGROUND During high-flow nasal cannula (HFNC) therapy, flow plays a crucial role in the physiological effects. However, there is no consensus on the initial flow settings and subsequent titration. Thus, we aimed to systematically synthesize the effects of flows during HFNC treatment. METHODS In this systematic review, two investigators independently searched PubMed, Embase, Web of Science, Scopus, and Cochrane for in vitro and in vivo studies investigating the effects of flows in HFNC treatment published in English before July 10, 2022. We excluded studies that investigated the pediatric population (< 18 years) or used only one flow. Two investigators independently extracted the data and assessed the risk of bias. The study protocol was prospectively registered with PROSPERO, CRD42022345419. RESULTS In total, 32,543 studies were identified, and 44 were included. In vitro studies evaluated the effects of flow settings on the fraction of inspired oxygen (FIO2), positive end-expiratory pressure, and carbon dioxide (CO2) washout. These effects are flow-dependent and are maximized when the flow exceeds the patient peak inspiratory flow, which varies between patients and disease conditions. In vivo studies report that higher flows result in improved oxygenation and dead space washout and can reduce work of breathing. Higher flows also lead to alveolar overdistention in non-dependent lung regions and patient discomfort. The impact of flows on different patients is largely heterogeneous. INTERPRETATION Individualizing flow settings during HFNC treatment is necessary, and titrating flow based on clinical findings like oxygenation, respiratory rates, ROX index, and patient comfort is a pragmatic way forward.
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Affiliation(s)
- Jie Li
- Division of Respiratory Care, Department of Cardiopulmonary Sciences, Rush University, 600 S Paulina St, Suite 765, Chicago, IL, 60612, USA.
| | - Fai A. Albuainain
- grid.262743.60000000107058297Division of Respiratory Care, Department of Cardiopulmonary Sciences, Rush University, 600 S Paulina St, Suite 765, Chicago, IL 60612 USA ,grid.411975.f0000 0004 0607 035XDepartment of Respiratory Care, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Wei Tan
- grid.412636.40000 0004 1757 9485Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of China Medical University, Shenyang, China
| | - J. Brady Scott
- grid.262743.60000000107058297Division of Respiratory Care, Department of Cardiopulmonary Sciences, Rush University, 600 S Paulina St, Suite 765, Chicago, IL 60612 USA
| | - Oriol Roca
- grid.428313.f0000 0000 9238 6887Servei de Medicina Intensiva, Parc Taulí Hospital Universitari, Sabadell, Spain ,grid.413448.e0000 0000 9314 1427Centro de Investigacion Biomedica en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain ,grid.7080.f0000 0001 2296 0625Departament de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Tommaso Mauri
- grid.414818.00000 0004 1757 8749Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy ,grid.4708.b0000 0004 1757 2822Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
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Li Z, Gao Y, Zhao Z. Volume-OXygenation Index to Predict High-flow Nasal Cannula Failure: How to Capture the Tidal Volume Matters. Am J Respir Crit Care Med 2023; 207:490-491. [PMID: 36198170 PMCID: PMC9940149 DOI: 10.1164/rccm.202209-1659le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Zhe Li
- Shanghai Jiao Tong University School of Medicine Affiliated Renji HospitalShanghai, China
| | - Yuan Gao
- Shanghai Jiao Tong University School of Medicine Affiliated Renji HospitalShanghai, China,Corresponding author (e-mail: )
| | - Zhanqi Zhao
- Fourth Military Medical UniversityXi’an, China and,Furtwangen UniversityVillingen-Schwenningen, Germany
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Whitney J, Keir I. Clinical review of high-flow nasal oxygen therapy in human and veterinary patients. Front Vet Sci 2023; 10:1070881. [PMID: 36950541 PMCID: PMC10027015 DOI: 10.3389/fvets.2023.1070881] [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: 10/15/2022] [Accepted: 02/02/2023] [Indexed: 03/08/2023] Open
Abstract
Oxygen therapy is the first-line treatment for hypoxemic acute respiratory failure. In veterinary medicine this has traditionally been provided via mask, low-flow nasal oxygen cannulas, oxygen cages and invasive positive pressure ventilation. Traditional non-invasive modalities are limited by the maximum flow rate and fraction of inspired oxygen (FiO2) that can be delivered, variability in oxygen delivery and patient compliance. The invasive techniques are able to provide higher FiO2 in a more predictable manner but are limited by sedation/anesthesia requirements, potential complications and cost. High-flow nasal oxygen therapy (HFNOT) represents an alternative to conventional oxygen therapy. This modality delivers heated and humidified medical gas at adjustable flow rates, up to 60 L/min, and FiO2, up to 100%, via nasal cannulas. It has been proposed that HFNOT improves pulmonary mechanics and reduces respiratory fatigue via reduction of anatomical dead space, provision of low-level positive end-expiratory pressure (PEEP), provision of constant FiO2 at rates corresponding to patient requirements and through improved patient tolerance. Investigations into the use of HFNOT in veterinary patients have increased in frequency since its clinical use was first reported in dogs with acute respiratory failure in 2016. Current indications in dogs include acute respiratory failure associated with pulmonary parenchymal disease, upper airway obstruction and carbon monoxide intoxication. The use of HFNOT has also been advocated in certain conditions in cats and foals. HFNOT is also being used with increasing frequency in the treatment of a widening range of conditions in humans. Although there remains conflict regarding its use and efficacy in some patient groups, overall these reports indicate that HFNOT decreases breathing frequency and work of breathing and reduces the need for escalation of respiratory support. In addition, they provide insight into potential future veterinary applications. Complications of HFNOT have been rarely reported in humans and animals. These are usually self-limiting and typically result in lower morbidity and mortality than those associated with invasive ventilation techniques.
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Kumar N, Kumar Kandrakonda P, Rathinasamy M, Kumar A, Singh K, Kumar A, Kumar A. The Utility of High-Flow Nasal Oxygen Therapy in a Patient with Pneumonia Undergoing Lower Limb Orthopaedic Surgery: A Case Report. Turk J Anaesthesiol Reanim 2022; 50:458-461. [PMID: 36511497 PMCID: PMC9885824 DOI: 10.5152/tjar.2022.21250] [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] [Indexed: 12/13/2022] Open
Abstract
A high-flow nasal cannula is commonly used to manage hypoxic respiratory failure. High-flow nasal cannula not only reduces respiratory effort and work of breathing but also provides better patient comfort. It lowers mortality compared to standard oxygen therapy or non-invasive ventila tion and is associated with more ventilator-free days. A 60-year-old female presented for the correction of ankle fracture with pneumonia and successfully underwent lower limb orthopaedic surgery under the subarachnoid block with the use of high-flow nasal oxygen therapy. High-flow nasal cannula may be considered as one of the useful options for intraoperative management of pneumonia in patients undergoing lower limb surgery under regional anaesthesia.
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Affiliation(s)
- Neeraj Kumar
- Department of Trauma and Emergency, All India Institute of Medical Sciences Patna, Bihar, India,Corresponding author: Neeraj Kumar, e-mail:
| | | | - Mithun Rathinasamy
- Department of Anaesthesiology, All India Institute of Medical Sciences Patna, Bihar, India
| | - Abhyuday Kumar
- Department of Anaesthesiology, All India Institute of Medical Sciences Patna, Bihar, India,Corresponding author: Neeraj Kumar, e-mail:
| | - Kunal Singh
- Department of Anaesthesiology, All India Institute of Medical Sciences Patna, Bihar, India
| | - Anup Kumar
- Department of Orthopaedics, All India Institute of Medical Sciences Patna, Bihar, India,Corresponding author: Neeraj Kumar, e-mail:
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An Analysis of the Effect of Noninvasive Positive Pressure Ventilation on Patients with Respiratory Failure Complicated by Diabetes Mellitus. DISEASE MARKERS 2022; 2022:3597200. [PMID: 36277980 PMCID: PMC9586794 DOI: 10.1155/2022/3597200] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 09/10/2022] [Indexed: 11/17/2022]
Abstract
Objective To observe the clinical effectiveness of noninvasive positive pressure ventilation in patients with respiratory failure complicated by diabetes. Methods From May 2021 to May 2022, 90 patients with respiratory failure complicated by diabetes treated in our hospital were recruited and randomly assigned to receive either medication (control group) or noninvasive positive pressure ventilation (study group), with 45 patients in each group. The clinical endpoint was therapeutic outcomes. Results Noninvasive positive pressure ventilation resulted in significantly lower Self-Rating Anxiety Scale (SAS) and Self-Rating Depression Scale (SDS) scores versus medications (P < 0.05). Patients with noninvasive positive pressure ventilation showed better pulmonary function indices versus those with medications (P > 0.05). There was no significant difference in arterial oxygen (PaO2), carbon dioxide partial pressure (PaCO2), and arterial oxygen pressure/inspired fraction of O2 (PaO2/FiO2) between the two groups prior to the intervention (P > 0.05). However, patients in the study group had significantly elevated PaO2 and PaO2/FiO2 and lower PaCO2 levels than those in the control group (P < 0.05). Following the intervention, noninvasive positive pressure ventilation resulted in significantly lower inflammatory factor levels versus medications (P > 0.05). After the intervention, markedly better glucose control was observed in the study group versus the control group (P < 0.05). The incidence of complications in the control group was 2.38%, which was significantly lower than that of the control group (16.67) (P < 0.05). Conclusion Noninvasive positive pressure ventilation effectively suppresses the inflammatory response, improves the blood gas analysis index, and eliminates the negative emotions of patients, thereby maintaining hemodynamic stability and improving clinical efficacy with a better safety profile. Further studies are recommended prior to clinical promotion.
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Changes in lung volume estimated by electrical impedance tomography during apnea and high-flow nasal oxygenation: A single-center randomized controlled trial. PLoS One 2022; 17:e0273120. [PMID: 36170281 PMCID: PMC9518885 DOI: 10.1371/journal.pone.0273120] [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: 03/21/2022] [Accepted: 07/22/2022] [Indexed: 11/19/2022] Open
Abstract
Background
Previous studies concerning humidified, heated high-flow nasal oxygen delivered in spontaneously breathing patients postulated an increase in functional residual capacity as one of its physiological effects. It is unclear wheter this is also true for patients under general anesthesia.
Methodology
The sincle-center noninferiority trial was registered at ClinicalTrials.gov (NCT NCT03478774). This secondary outcome analysis shows estimated differences in lung volume changes using electrical impedance tomography between different flow rates of 100% oxygen in apneic, anesthetized and paralyzed adults prior to intubation. One hundred and twenty five patients were randomized to five groups with different flow rates of 100% oxygen: i) minimal-flow: 0.25 l.min-1 via endotracheal tube; ii) low-flow: 2 l.min-1 + continuous jaw thrust; iii) medium-flow: 10 l.min-1 + continuous jaw thrust; iv) high-flow: 70l.min-1 + continuous jaw thrust; and v) control: 70 l.min-1 + continuous video-laryngoscopy. After standardized anesthesia induction with non-depolarizing neuromuscular blockade, the 15-minute apnea period and oxygen delivery was started according to the randomized flow rate. Continuous electrical impedance tomography measurements were performed during the 15-minute apnea period. Total change in lung impedance (an estimate of changes in lung volume) over the 15-minute apnea period and times to 25%, 50% and 75% of total impedance change were calculated.
Results
One hundred and twenty five patients completed the original study. Six patients did not complete the 15-minute apnea period. Due to maloperation, malfunction and artefacts additional 54 measurements had to be excluded, resulting in 65 patients included into this secondary outcome analysis. We found no differences between groups with respect to decrease in lung impedance or curve progression over the observation period.
Conclusions
Different flow rates of humidified 100% oxygen during apnea result in comparable decreases in lung volumes. The demonstrated increase in functional residual capacity during spontaneous breathing with high-flow nasal oxygenation could not be replicated during apnea under general anesthesia with neuromuscular blockade.
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12
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Gan W, Yang X, Chen J, Lyu H, Yan A, Chen G, Li S, Zhang Y, Dan L, Huang H, Duan G. Role of daytime variation in pharmaceutical effects of sufentanil, dezocine, and tramadol: A matched observational study. Front Pharmacol 2022; 13:993506. [PMID: 36188598 PMCID: PMC9523536 DOI: 10.3389/fphar.2022.993506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 08/30/2022] [Indexed: 11/21/2022] Open
Abstract
The role of daytime variation in the comprehensive pharmaceutical effects of commonly used opioid analgesics in clinical setting remains unclear. This study aimed to explore the differences in daytime variation among elective surgery patients who were scheduled to receive preemptive analgesia with equivalent doses of sufentanil, dezocine, and tramadol in the morning and afternoon. The analgesic effect was assessed by changes in the pressure pain threshold before and after intravenous administration of sufentanil, dezocine, and tramadol. Respiratory effects were evaluated using pulse oximetry, electrical impedance tomography, and arterial blood gas analysis. Other side effects, including nausea, sedation, and dizziness, were also recorded, and blood concentration was measured. The results showed that the analgesic effects of sufentanil, dezocine, and tramadol were significantly better in the morning than in afternoon. In the afternoon, sufentanil had a stronger sedative effect, whereas dezocine had a stronger inhibitory respiratory effect. The incidence of nausea was higher in the morning with tramadol. Additionally, significant differences in different side effects were observed among three opioids. Our results suggest that the clinical use of these three opioids necessitates the formulation of individualized treatment plans, accounting for different administration times, to achieve maximum analgesic effect with minimal side effects.
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Affiliation(s)
- Wanxia Gan
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Xinqing Yang
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Jie Chen
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Hongyao Lyu
- Department of Preventive Medicine, West China School of Public Health, Sichuan University, Chengdu, Sichuan, China
| | - Ai Yan
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Guizhen Chen
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Shiqi Li
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Yamei Zhang
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Ling Dan
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - He Huang
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
- *Correspondence: He Huang, ; Guangyou Duan,
| | - Guangyou Duan
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
- *Correspondence: He Huang, ; Guangyou Duan,
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13
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Elfeky A, Chen YF, Grove A, Hooper A, Wilson A, Couper K, Thompson M, Uthman O, Court R, Tomassini S, Yeung J. Perioperative oxygen therapy: a protocol for an overview of systematic reviews and meta-analyses. Syst Rev 2022; 11:140. [PMID: 35831881 PMCID: PMC9277880 DOI: 10.1186/s13643-022-02005-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 06/13/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Oxygen is routinely given to patients during and after surgery. Perioperative oxygen administration has been proposed as a potential strategy to prevent and treat hypoxaemia and reduce complications, such as surgical site infections, pulmonary complications and mortality. However, uncertainty exists as to which strategies in terms of amount, delivery devices and timing are clinically effective. The aim of this overview of systematic reviews and meta-analyses is to answer the research question, 'For which types of surgery, at which stages of care, in which sub-groups of patients and delivered under what conditions are different types of perioperative oxygen therapy clinically effective?'. METHODS We will search key electronic databases (MEDLINE, EMBASE, the Cochrane Database of Systematic Reviews, CENTRAL, Epistemonikos, PROSPERO, the INAHTA International HTA Database and DARE archives) for systematic reviews and randomised controlled trials comparing perioperative oxygen strategies. Each review will be mapped according to type of surgery, surgical pathway timepoints and clinical comparison. The highest quality reviews with the most comprehensive and up-to-date coverage of relevant literature will be chosen as anchoring reviews. Standardised data will be extracted from each chosen review, including definition of oxygen therapy, summaries of interventions and comparators, patient population, surgical characteristics and assessment of overall certainty of evidence. For clinical outcomes and adverse events, the overall pooled findings and results of subgroup and sensitivity analyses (where available) will be extracted. Trial-level data will be extracted for surgical site infections, mortality, and potential trial-level effect modifiers such as risk of bias, outcome definition and type of surgery to facilitate quantitative data analysis. This analysis will adopt a multiple indication review approach with panoramic meta-analysis using review-level data and meta-regression using trial-level data. An evidence map will be produced to summarise our findings and highlight any research gaps. DISCUSSION There is a need to provide a panoramic overview of systematic reviews and meta-analyses describing peri-operative oxygen practice to both inform clinical practice and identify areas of ongoing uncertainty, where further research may be required. SYSTEMATIC REVIEW REGISTRATION: PROSPERO CRD42021272361.
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Affiliation(s)
- Adel Elfeky
- Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK
| | - Yen-Fu Chen
- Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK.
| | - Amy Grove
- Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK
| | - Amy Hooper
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Anna Wilson
- Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK
| | - Keith Couper
- Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK.,University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Marion Thompson
- Independent patient and public involvement and engagement advisor, Birmingham, UK
| | - Olalekan Uthman
- Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK
| | - Rachel Court
- Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK
| | - Sara Tomassini
- Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK
| | - Joyce Yeung
- Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK.,University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
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14
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Kumar N, Singh K, Saravanan P, Pattanayak A. Perioperative role of high flow nasal oxygen therapy in elderly patients undergoing emergency lower limb amputation. Indian J Anaesth 2022; 66:S230-S232. [PMID: 35874487 PMCID: PMC9298942 DOI: 10.4103/ija.ija_613_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 10/20/2021] [Accepted: 10/26/2021] [Indexed: 11/04/2022] Open
Affiliation(s)
- Neeraj Kumar
- Department of Trauma and Emergency, All India Institute of Medical Sciences, Patna, Bihar, India,Address for correspondence: Dr. Neeraj Kumar, Room No. 505, 5th Floor, New OT Complex, B Block, Department of Trauma and Emergency, AIIMS, Patna - 801 505, Bihar, India. E-mail:
| | - Kirtika Singh
- Department of Anaesthesiology, All India Institute of Medical Sciences, Patna, Bihar, India
| | - P Saravanan
- Department of Anaesthesiology, All India Institute of Medical Sciences, Patna, Bihar, India
| | - Arunima Pattanayak
- Department of Anaesthesiology, All India Institute of Medical Sciences, Patna, Bihar, India
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15
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Is Time-of-Flight Ready for Take Off to Measure Patient Self-Inflicted Lung Injury? Crit Care Med 2022; 50:168-170. [PMID: 34914651 DOI: 10.1097/ccm.0000000000005237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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16
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Li J, Zeng F, Yang F, Luo X, Liu R, Ren Y, Lan Y, Lei Y, Zhao G, Huang X. Electrical Impedance Tomography Predicts Weaning Success in Adult Patients With Delayed Upper Abdominal Surgery: A Single-Center Retrospective Study. Front Med (Lausanne) 2021; 8:748493. [PMID: 34926497 PMCID: PMC8674867 DOI: 10.3389/fmed.2021.748493] [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: 07/28/2021] [Accepted: 11/09/2021] [Indexed: 11/13/2022] Open
Abstract
Objective: To evaluate the predictive value of electrical impedance tomography (EIT) in patients with delayed ventilator withdrawal after upper abdominal surgery. Methods: We retrospectively analyzed data of patients who were ventilated >24 h after upper abdominal surgery between January 2018 and August 2019. The patients were divided into successful (group S) and failed (group F) weaning groups. EIT recordings were obtained at 0, 5, 15, and 30 min of spontaneous breathing trials (SBTs) with SBT at 0 min set as baseline. We assessed the change in delta end-expiratory lung impedance and tidal volume ratio (ΔEELI/VT) from baseline, the change in compliance change percentage variation (|Δ(CW-CL)|) from baseline, the standard deviation of regional ventilation delay index (RVDSD), and global inhomogeneity (GI) using generalized estimation equation analyses. Receiver operating characteristic curve analyses were performed to evaluate the predictive value of parameters indicating weaning success. Results: Among the 32 included patients, ventilation weaning was successful in 23 patients but failed in nine. Generalized estimation equation analysis showed that compared with group F, the ΔEELI/VT was lower, and the GI, RVDSD, and (|Δ(CW-CL)|) were higher in group S. For predicting withdrawal failure, the areas under the curve of the ΔEELI/VT, (|Δ(CW-CL)|), and the RVDSD were 0.819, 0.918, and 0.918, and 0.816, 0.884, and 0.918 at 15 and 30 min during the SBTs, respectively. Conclusion: The electrical impedance tomography may predict the success rate of ventilator weaning in patients with delayed ventilator withdrawal after upper abdominal surgery.
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Affiliation(s)
- Jiajia Li
- Department of Intensive Care Unit, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Fan Zeng
- Department of Intensive Care Unit, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Fuxun Yang
- Department of Intensive Care Unit, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Xiaoxiu Luo
- Department of Intensive Care Unit, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Rongan Liu
- Department of Intensive Care Unit, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Yinjie Ren
- Department of Intensive Care Unit, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Yunping Lan
- Department of Intensive Care Unit, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Yu Lei
- Department of Intensive Care Unit, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Gaoping Zhao
- Department of Gastrointestinal Surgery, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Xiaobo Huang
- Department of Intensive Care Unit, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
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17
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Li Z, Zhang Z, Xia Q, Xu D, Qin S, Dai M, Fu F, Gao Y, Zhao Z. First Attempt at Using Electrical Impedance Tomography to Predict High Flow Nasal Cannula Therapy Outcomes at an Early Phase. Front Med (Lausanne) 2021; 8:737810. [PMID: 34692729 PMCID: PMC8533818 DOI: 10.3389/fmed.2021.737810] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 09/07/2021] [Indexed: 01/21/2023] Open
Abstract
Objective: Spatial and temporal ventilation distributions in patients with acute respiratory failure during high flow nasal cannula (HFNC) therapy were previously studied with electrical impedance tomography (EIT). The aim of the study was to explore the possibility of predicting HFNC failure based on various EIT-derived parameters. Methods: High flow nasal cannula failure was defined reintubation within 48 h after HFNC. EIT was performed with the patients spontaneously breathing in the supine position at the start of HFNC. EIT-based indices (comprising the global inhomogeneity index, center of ventilation, ventilation delay, rapid shallow breathing index, minute volume, and inspiration to expiration time) were explored and evaluated at three time points (prior to HFNC, T1; 30 min after HFNC started, T2; and 1 h after, T3). Results: A total of 46 subjects were included in the final analysis. Eleven subjects had failed HFNC. The time to failure was 27.8 ± 12.4 h. The ROX index (defined as SpO2/FiO2/respiratory rate) for HFNC success patients was 8.3 ± 2.7 and for HFNC failure patients, 6.2 ± 1.8 (p = 0.23). None of the investigated EIT-based parameters showed significant differences between subjects with HFNC failure and success. Further subgroup analysis indicated that a significant difference in ventilation inhomogeneity was found between ARDS and non-ARDS [0.54 (0.37) vs. 0.46 (0.28) as evaluated with GI, p < 0.01]. Ventilation homogeneity significantly improved in ARDS after 60-min HFNC treatment [0.59 (0.20) vs 0.57 (0.19), T1 vs. T3, p < 0.05]. Conclusion: Spatial and temporal ventilation distributions were slightly but insignificantly different between the HFNC success and failure groups. HFNC failure could not be predicted by changes in EIT temporal and spatial indexes of ventilation distribution within the first hour. Further studies are required to predict the outcomes of HFNC.
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Affiliation(s)
- Zhe Li
- Department of Critical Care Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Zhiyun Zhang
- Department of Critical Care Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Qian Xia
- Department of Critical Care Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Danling Xu
- Department of Critical Care Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Shaojie Qin
- Department of Critical Care Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Meng Dai
- Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China
| | - Feng Fu
- Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China
| | - Yuan Gao
- Department of Critical Care Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Zhanqi Zhao
- Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.,Institute of Technical Medicine, Furtwangen University, Villingen-Schwenningen, Germany
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18
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Fulton R, Millar JE, Merza M, Johnston H, Corley A, Faulke D, Rapchuk IL, Tarpey J, Fanning JP, Lockie P, Lockie S, Fraser JF. Prophylactic Postoperative High Flow Nasal Oxygen Versus Conventional Oxygen Therapy in Obese Patients Undergoing Bariatric Surgery (OXYBAR Study): a Pilot Randomised Controlled Trial. Obes Surg 2021; 31:4799-4807. [PMID: 34387826 DOI: 10.1007/s11695-021-05644-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 07/30/2021] [Accepted: 07/30/2021] [Indexed: 12/19/2022]
Abstract
BACKGROUND Patients with obesity are predisposed to a reduction in end-expiratory lung volume (EELV) and atelectasis after anaesthesia. High flow nasal oxygen (HFNO) may increase EELV, reducing the likelihood of postoperative pulmonary complications (PPC). We conducted a pilot randomised controlled trial (RCT) of conventional oxygen therapy versus HFNO after bariatric surgery. The aim was to investigate the feasibility of using electrical impedance tomography (EIT) as a means of assessing respiratory mechanics and to inform the design of a definitive RCT. METHODS We performed a single-centre, parallel-group, pilot RCT. Adult patients with obesity undergoing elective bariatric surgery were eligible for inclusion. We excluded patients with a known contraindication to HFNO or with chronic lung disease. RESULTS Fifty patients were randomised in equal proportions. One patient crossed over from conventional O2 to HFNO. Delta EELI was higher at 1 hour in patients receiving HFNO (mean difference = 831 Au (95% CI - 1636-3298), p = 0.5). Continuous EIT beyond 1 hour was poorly tolerated. At 6 hours, there were no differences in PaO2/FiO2 ratio or PaCO2. Only one patient developed a PPC (in the HFNO group) by 6 weeks. CONCLUSIONS These data suggest that a large-scale RCT of HFNO after bariatric surgery in an 'all-comers' population is likely infeasible. While EIT was an effective means of assessing respiratory mechanics, it was impractical over time. Similarly, the infrequency of PPC precludes its use as a primary outcome. Future studies should focus on identifying patients at the greatest risk of PPC.
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Affiliation(s)
- Rachel Fulton
- Department of Anaesthesia and Critical Care, Queen Elizabeth II University Hospital, Glasgow, UK.,Critical Care Research Group, The Prince Charles Hospital, Rode Road, Brisbane, Queensland, 4032, Australia
| | - Jonathan E Millar
- Critical Care Research Group, The Prince Charles Hospital, Rode Road, Brisbane, Queensland, 4032, Australia.,Faculty of Medicine, University of Queensland, Brisbane, Australia.,Roslin Institute, University of Edinburgh, Edinburgh, UK
| | - Megan Merza
- St. Andrew's War Memorial Hospital, Brisbane, Australia
| | | | - Amanda Corley
- Critical Care Research Group, The Prince Charles Hospital, Rode Road, Brisbane, Queensland, 4032, Australia.,Griffith University, Griffith, Australia
| | - Daniel Faulke
- St. Andrew's War Memorial Hospital, Brisbane, Australia
| | - Ivan L Rapchuk
- Faculty of Medicine, University of Queensland, Brisbane, Australia.,St. Andrew's War Memorial Hospital, Brisbane, Australia
| | - Joe Tarpey
- St. Andrew's War Memorial Hospital, Brisbane, Australia
| | - Jonathon P Fanning
- Critical Care Research Group, The Prince Charles Hospital, Rode Road, Brisbane, Queensland, 4032, Australia.,Faculty of Medicine, University of Queensland, Brisbane, Australia
| | - Philip Lockie
- St. Andrew's War Memorial Hospital, Brisbane, Australia
| | | | - John F Fraser
- Critical Care Research Group, The Prince Charles Hospital, Rode Road, Brisbane, Queensland, 4032, Australia. .,Faculty of Medicine, University of Queensland, Brisbane, Australia.
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19
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Theologou S, Ischaki E, Zakynthinos SG, Charitos C, Michopanou N, Patsatzis S, Mentzelopoulos SD. High Flow Oxygen Therapy at Two Initial Flow Settings versus Conventional Oxygen Therapy in Cardiac Surgery Patients with Postextubation Hypoxemia: A Single-Center, Unblinded, Randomized, Controlled Trial. J Clin Med 2021; 10:jcm10102079. [PMID: 34066244 PMCID: PMC8151420 DOI: 10.3390/jcm10102079] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/09/2021] [Accepted: 05/10/2021] [Indexed: 01/10/2023] Open
Abstract
In cardiac surgery patients with pre-extubation PaO2/inspired oxygen fraction (FiO2) < 200 mmHg, the possible benefits and optimal level of high-flow nasal cannula (HFNC) support are still unclear; therefore, we compared HFNC support with an initial gas flow of 60 or 40 L/min and conventional oxygen therapy. Ninety nine patients were randomly allocated (respective ratio: 1:1:1) to I = intervention group 1 (HFNC initial flow = 60 L/min, FiO2 = 0.6), intervention group 2 (HFNC initial flow = 40 L/min, FiO2 = 0.6), or control group (Venturi mask, FiO2 = 0.6). The primary outcome was occurrence of treatment failure. The baseline characteristics were similar. The hazard for treatment failure was lower in intervention group 1 vs. control (hazard ratio (HR): 0.11, 95% CI: 0.03–0.34) and intervention group 2 vs. control (HR: 0.30, 95% CI: 0.12–0.77). During follow-up, the probability of peripheral oxygen saturation (SpO2) > 92% and respiratory rate within 12–20 breaths/min was 2.4–3.9 times higher in intervention group 1 vs. the other 2 groups. There was no difference in PaO2/FiO2, patient comfort, intensive care unit or hospital stay, or clinical course complications or adverse events. In hypoxemic cardiac surgery patients, postextubation HFNC with an initial gas flow of 60 or 40 L/min resulted in less frequent treatment failure vs. conventional therapy. The results in terms of SpO2/respiratory rate targets favored an initial HFNC flow of 60 L/min.
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Affiliation(s)
- Stavros Theologou
- Department of Cardiac Surgery, Evaggelismos General Hospital, 10675 Athens, Greece; (S.T.); (C.C.); (N.M.); (S.P.)
| | - Eleni Ischaki
- First Department of Intensive Care Medicine, National and Kapodistrian University of Athens Medical School, Evaggelismos General Hospital, 10675 Athens, Greece; (E.I.); (S.G.Z.)
| | - Spyros G. Zakynthinos
- First Department of Intensive Care Medicine, National and Kapodistrian University of Athens Medical School, Evaggelismos General Hospital, 10675 Athens, Greece; (E.I.); (S.G.Z.)
| | - Christos Charitos
- Department of Cardiac Surgery, Evaggelismos General Hospital, 10675 Athens, Greece; (S.T.); (C.C.); (N.M.); (S.P.)
| | - Nektaria Michopanou
- Department of Cardiac Surgery, Evaggelismos General Hospital, 10675 Athens, Greece; (S.T.); (C.C.); (N.M.); (S.P.)
| | - Stratos Patsatzis
- Department of Cardiac Surgery, Evaggelismos General Hospital, 10675 Athens, Greece; (S.T.); (C.C.); (N.M.); (S.P.)
| | - Spyros D. Mentzelopoulos
- First Department of Intensive Care Medicine, National and Kapodistrian University of Athens Medical School, Evaggelismos General Hospital, 10675 Athens, Greece; (E.I.); (S.G.Z.)
- Correspondence: or ; Tel.: +30-697-530-4909
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20
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L'Her E, Nazir S, Pateau V, Visvikis D. Accuracy of noncontact surface imaging for tidal volume and respiratory rate measurements in the ICU. J Clin Monit Comput 2021; 36:775-783. [PMID: 33886075 PMCID: PMC8060689 DOI: 10.1007/s10877-021-00708-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 04/13/2021] [Indexed: 01/24/2023]
Abstract
Tidal volume monitoring may help minimize lung injury during respiratory assistance. Surface imaging using time-of-flight camera is a new, non-invasive, non-contact, radiation-free, and easy-to-use technique that enables tidal volume and respiratory rate measurements. The objectives of the study were to determine the accuracy of Time-of-Flight volume (VTTOF) and respiratory rate (RRTOF) measurements at the bedside, and to validate its application for spontaneously breathing patients under high flow nasal canula. Data analysis was performed within the ReaSTOC data-warehousing project (ClinicalTrials.gov identifier NCT02893462). All data were recorded using standard monitoring devices, and the computerized medical file. Time-of-flight technique used a Kinect V2 (Microsoft, Redmond, WA, USA) to acquire the distance information, based on measuring the phase delay between the emitted light-wave and received backscattered signals. 44 patients (32 under mechanical ventilation; 12 under high-flow nasal canula) were recorded. High correlation (r = 0.84; p < 0.001), with low bias (-1.7 mL) and acceptable deviation (75 mL) was observed between VTTOF and VTREF under ventilation. Similar performance was observed for respiratory rate (r = 0.91; p < 0.001; bias < 1b/min; deviation ≤ 5b/min). Measurements were possible for all patients under high-flow nasal canula, detecting overdistension in 4 patients (tidal volume > 8 mL/kg) and low ventilation in 6 patients (tidal volume < 6 mL/kg). Tidal volume monitoring using time-of-flight camera (VTTOF) is correlated to reference values. Time-of-flight camera enables continuous and non-contact respiratory monitoring under high-flow nasal canula, and enables to detect tidal volume and respiratory rate changes, while modifying flow. It enables respiratory monitoring for spontaneously patients, especially while using high-flow nasal oxygenation.
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Affiliation(s)
- Erwan L'Her
- Médecine Intensive Et Réanimation, CHRU de La Cavale Blanche, Bvd. Tanguy-Prigent, 29609, BREST Cedex, France. .,LATIM INSERM UMR 1101, Université de Bretagne Occidentale, BREST, France.
| | - Souha Nazir
- LATIM INSERM UMR 1101, Université de Bretagne Occidentale, BREST, France
| | - Victoire Pateau
- Médecine Intensive Et Réanimation, CHRU de La Cavale Blanche, Bvd. Tanguy-Prigent, 29609, BREST Cedex, France
| | - Dimitris Visvikis
- LATIM INSERM UMR 1101, Université de Bretagne Occidentale, BREST, France
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21
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Zhao Z, Zhang JS, Chen YT, Chang HT, Hsu YL, Frerichs I, Adler A. The use of electrical impedance tomography for individualized ventilation strategy in COVID-19: a case report. BMC Pulm Med 2021; 21:38. [PMID: 33482796 PMCID: PMC7820832 DOI: 10.1186/s12890-021-01411-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 01/14/2021] [Indexed: 01/10/2023] Open
Abstract
Background Clinical management of COVID-19 requires close monitoring of lung function. While computed tomography (CT) offers ideal way to identify the phenotypes, it cannot monitor the patient response to therapeutic interventions. We present a case of ventilation management for a COVID-19 patient where electrical impedance tomography (EIT) was used to personalize care. Case presentation The patient developed acute respiratory distress syndrome, required invasive mechanical ventilation, and was subsequently weaned. EIT was used multiple times: to titrate the positive end-expiratory pressure, understand the influence of body position, and guide the support levels during weaning and after extubation. We show how EIT provides bedside monitoring of the patient´s response to various therapeutic interventions and helps guide treatments. Conclusion EIT provides unique information that may help the ventilation management in the pandemic of COVID-19.
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Affiliation(s)
- Zhanqi Zhao
- Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.,Institute of Technical Medicine, Furtwangen University, Villingen-Schwenningen, Germany
| | - Jin-Shou Zhang
- Division of Chest Medicine, Far Eastern Memorial Hospital, Taipei, Taiwan
| | - Ying-Tzu Chen
- Division of Chest Medicine, Far Eastern Memorial Hospital, Taipei, Taiwan
| | - Hou-Tai Chang
- Department of Critical Care Medicine, Far Eastern Memorial Hospital, No. 21, Sec. 2, Nanya S. Rd., Banciao Dist., New Taipei City, 220, Taiwan, ROC.
| | - Yeong-Long Hsu
- Division of Chest Medicine, Far Eastern Memorial Hospital, Taipei, Taiwan
| | - Inéz Frerichs
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center of Schleswig-Holstein Campus Kiel, Kiel, Germany
| | - Andy Adler
- Department of Systems and Computer Engineering, Carleton University, Ottawa, Canada
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22
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Ko RE, Park C, Nam J, Ko MG, Na SJ, Ahn JH, Carriere KC, Jeon K. Effect of post-extubation high-flow nasal cannula on reintubation in elderly patients: a retrospective propensity score-matched cohort study. Ther Adv Respir Dis 2020; 14:1753466620968497. [PMID: 33121395 PMCID: PMC7607726 DOI: 10.1177/1753466620968497] [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] [Indexed: 11/17/2022] Open
Abstract
Background: Studies of mechanically ventilated patients with a low risk of reintubation have suggested that the use of high-flow nasal cannula (HFNC) oxygen therapy reduces the risk of reintubation compared with conventional oxygen therapy (COT). However, the effect of HFNC following extubation in elderly patients with a high risk of reintubation remains unclear. Methods: All consecutive medical intensive care unit (ICU) patients aged >65 years who were mechanically ventilated for >24 h were prospectively registered between July 2017 and June 2018. Control was obtained from a historical database of patients attending the same ICU from January 2012 to December 2013. A total of 152 patients who underwent HFNC after planned extubation according to institutional protocols (HFNC group) were compared with a propensity-matched historical control group who underwent COT (n = 175, COT group). The primary outcome was the proportion of reintubated patients within 48 h after planned extubation. Results: One hundred patients from the HFNC group and 129 patients from the COT group were matched by a propensity score that reflected the probability of receiving HFNC, and all variables were well matched. Post-extubation respiratory failure (41.0% versus 33.3%, p = 0.291) and reintubation rate within 48 h (16.0% versus 11.6%, p = 0.436) did not differ between the HFNC and COT groups. However, decreased levels of consciousness as a sign of post-extubation respiratory failure (27.0% versus 11.7%, p = 0.007) were significantly increased in the HFNC group compared with the COT group. Conclusion: Among elderly patients who underwent planned extubation, HFNC was not associated with a decrease in the risk of reintubation. Further prospective study evaluating the clinical benefits of post-extubation HFNC in elderly patients is needed. The reviews of this paper are available via the supplemental material section.
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Affiliation(s)
- Ryoung-Eun Ko
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Chul Park
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.,Division of Pulmonary Medicine, Department of Internal Medicine, Wonkwang University Hospital, 895 Muwang-ro, Iksan, Republic of Korea
| | - Jimyoung Nam
- Intensive Care Unit Nursing Department, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Myeong Gyun Ko
- Intensive Care Unit Nursing Department, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Soo Jin Na
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Joong Hyun Ahn
- Biostatistics and Clinical Epidemiology Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Keumhee C Carriere
- Biostatistics and Clinical Epidemiology Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.,Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta, Canada
| | - Kyeongman Jeon
- Department of Critical Care Medicine and Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul 06351, Republic of Korea
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23
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Matsuda W. Is the effect of a high-flow nasal cannula after extubation evaluated by electrical impedance tomography applicable to clinical practice? CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2020; 24:184. [PMID: 32345349 PMCID: PMC7189435 DOI: 10.1186/s13054-020-02899-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 04/14/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Wataru Matsuda
- Department of Emergency Medicine and Critical Care, Center Hospital of the National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku, Tokyo, 162-8655, Japan.
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