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Zhu F, de Oliveira CB, Mohsen N, Kharrat A, Deshpande P, Mertens L, Jain A. Challenges in clinical identification of right ventricular dysfunction in preterm infants with persistent pulmonary hypertension of the newborn. Early Hum Dev 2024; 190:105942. [PMID: 38306954 DOI: 10.1016/j.earlhumdev.2024.105942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 12/20/2023] [Accepted: 01/11/2024] [Indexed: 02/04/2024]
Abstract
BACKGROUND Right ventricular dysfunction, typically qualitatively diagnosed (Q-RVd) in preterm infants, requires echocardiography which is not always acutely available. We aimed to identify clinical indices of Q-RVd in very preterm infants (gestational age, GA <32 weeks) with persistent pulmonary hypertension of newborn (PPHN) and examine the reliability and validity of Q-RVd. METHODS Forty-seven infants with mean ± SD GA of 26.8 ± 2.7 weeks who had targeted neonatal echocardiography (TNE) ≤72 h old, during PPHN, were retrospectively studied. Three standard TNE clips were reviewed by two blinded assessors, and infants categorized as Q-RVd if moderate-severe RVd was diagnosed on ≥2 clips. Cardiopulmonary clinical indices at TNE and quantitative RV functional markers were compared between Q-RVd vs. no-RVd groups. Potential quantitative RVd definitions examined by classifying each measurement as "low" or "normal" using published data. Inter-rater agreement for Q-RVd assessed using Kappa statistics. RESULTS Mean age at TNE was 25.3 ± 20.4 h with Q-RVd diagnosed in 19(40 %) infants. Q-RVd group demonstrated higher peak oxygen requirements (96 ± 9 % vs. 84 ± 16 %, p < 0.01); however, no clinical parameters at TNE differentiated the groups. Quantitative measures were lower in Q-RVd patients, confirming classification validity. Among tested quantitative definitions, low RV stroke volume was associated with lower systolic blood pressure (41±7 vs. 47±9 mmHg, p = 0.02) and higher shock index (4.02±0.80 vs. 3.44±0.72, p = 0.02). Kappa for Q-RVd was 0.55 (95%CI 0.32-0.77). CONCLUSIONS The non-specific nature of clinical markers of RVd in preterm infants with PPHN necessitates echocardiographic diagnosis of RVd. Studies should examine prognostic relevance of RVd and establish outcome-based quantitative definitions in preterm infants.
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Affiliation(s)
- Faith Zhu
- Department of Paediatrics, Mount Sinai Hospital, Toronto, Ontario, Canada; Department of Paediatrics, University of Toronto, Ontario, Canada
| | - Caio Barbosa de Oliveira
- Department of Paediatrics, Mount Sinai Hospital, Toronto, Ontario, Canada; Department of Paediatrics, University of Toronto, Ontario, Canada
| | - Nada Mohsen
- Department of Paediatrics, Mount Sinai Hospital, Toronto, Ontario, Canada; Department of Paediatrics, University of Toronto, Ontario, Canada; Department of Pediatrics, Mansoura University, Mansoura, Egypt
| | - Ashraf Kharrat
- Department of Paediatrics, Mount Sinai Hospital, Toronto, Ontario, Canada; Department of Paediatrics, University of Toronto, Ontario, Canada
| | - Poorva Deshpande
- Department of Paediatrics, Mount Sinai Hospital, Toronto, Ontario, Canada; Department of Paediatrics, University of Toronto, Ontario, Canada
| | - Luc Mertens
- Department of Cardiology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Amish Jain
- Department of Paediatrics, Mount Sinai Hospital, Toronto, Ontario, Canada; Department of Paediatrics, University of Toronto, Ontario, Canada.
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Ganeriwal S, Alves Dos Anjos G, Schleicher M, Hockstein MA, Tonelli AR, Duggal A, Siuba MT. Right ventricle-specific therapies in acute respiratory distress syndrome: a scoping review. Crit Care 2023; 27:104. [PMID: 36907888 PMCID: PMC10008150 DOI: 10.1186/s13054-023-04395-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 03/06/2023] [Indexed: 03/14/2023] Open
Abstract
OBJECTIVE To summarize knowledge and identify gaps in evidence regarding treatment of right ventricular dysfunction (RVD) in acute respiratory distress syndrome (ARDS). DATA SOURCES We conducted a comprehensive search of MEDLINE, Embase, CINAHL, Web of Science, and the Cochrane Central Register of Controlled Trials. STUDY SELECTION Studies were included if they reported effects of treatments on right ventricular function, whether or not the intent was to modify right ventricular function. DATA EXTRACTION Data extraction was performed independently and in duplicate by two authors. Data items included the study design, patient population, type of intervention, comparison group, and RV-specific outcomes. DATA SYNTHESIS Of 1,430 studies screened, 51 studies reporting on 1,526 patients were included. By frequency, the included studies examined the following interventions: ventilator settings (29.4%), inhaled medications (33.3%), extracorporeal life support (13.7%), intravenous or oral medications (13.7%), and prone positioning (9.8%). The majority of the studies were non-randomized experimental studies (53%), with the next most common being case reports (16%). Only 5.9% of studies were RCTs. In total, 27% of studies were conducted with the goal of modifying RV function. CONCLUSIONS Given the prevalence of RVD in ARDS and its association with mortality, the dearth of research on this topic is concerning. This review highlights the need for prospective trials aimed at treating RV dysfunction in ARDS.
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Affiliation(s)
- Simran Ganeriwal
- Department of Internal Medicine, Community Care Institute, Cleveland Clinic, Cleveland, OH, USA
| | | | - Mary Schleicher
- The Cleveland Clinic Floyd D. Loop Alumni Library, Cleveland Clinic, Cleveland, OH, USA
| | - Maxwell A Hockstein
- Departments of Emergency Medicine and Critical Care, MedStar Washington Hospital Center, Washington, DC, USA
| | - Adriano R Tonelli
- Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, OH, USA.,Department of Pulmonary Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Abhijit Duggal
- Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Matthew T Siuba
- Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, OH, USA.
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Miller AG, Tan HL, Smith BJ, Rotta AT, Lee JH. The Physiological Basis of High-Frequency Oscillatory Ventilation and Current Evidence in Adults and Children: A Narrative Review. Front Physiol 2022; 13:813478. [PMID: 35557962 PMCID: PMC9087180 DOI: 10.3389/fphys.2022.813478] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 04/08/2022] [Indexed: 12/12/2022] Open
Abstract
High-frequency oscillatory ventilation (HFOV) is a type of invasive mechanical ventilation that employs supra-physiologic respiratory rates and low tidal volumes (VT) that approximate the anatomic deadspace. During HFOV, mean airway pressure is set and gas is then displaced towards and away from the patient through a piston. Carbon dioxide (CO2) is cleared based on the power (amplitude) setting and frequency, with lower frequencies resulting in higher VT and CO2 clearance. Airway pressure amplitude is significantly attenuated throughout the respiratory system and mechanical strain and stress on the alveoli are theoretically minimized. HFOV has been purported as a form of lung protective ventilation that minimizes volutrauma, atelectrauma, and biotrauma. Following two large randomized controlled trials showing no benefit and harm, respectively, HFOV has largely been abandoned in adults with ARDS. A multi-center clinical trial in children is ongoing. This article aims to review the physiologic rationale for the use of HFOV in patients with acute respiratory failure, summarize relevant bench and animal models, and discuss the potential use of HFOV as a primary and rescue mode in adults and children with severe respiratory failure.
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Affiliation(s)
- Andrew G Miller
- Duke University Medical Center, Respiratory Care Services, Durham, NC, United States
| | - Herng Lee Tan
- KK Women's and Children's Hospital, Children's Intensive Care Unit, Singapore, Singapore
| | - Brian J Smith
- University of California, Davis, Respiratory Care Services, Sacramento, CA, United States
| | - Alexandre T Rotta
- Duke University Medical Center, Division of Pediatric Critical Care Medicine, Durham, NC, United States
| | - Jan Hau Lee
- KK Women's and Children's Hospital, Children's Intensive Care Unit, Singapore, Singapore.,Duke-NUS Medical School, Singapore, Singapore
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4
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Roubík K, Ráfl J, Rožánek M, Kudrna P, Mlček M. Tidal volume significantly affects oxygenation in healthy pigs during high-frequency oscillatory ventilation compared to conventional ventilation. Biomed Eng Online 2022; 21:14. [PMID: 35152895 PMCID: PMC8842876 DOI: 10.1186/s12938-022-00984-x] [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: 10/01/2021] [Accepted: 01/30/2022] [Indexed: 01/12/2023] Open
Abstract
Abstract
Background
The role of high-frequency oscillatory ventilation (HFOV) has long been debated. Numerous studies documented its benefits, whereas several more recent studies did not prove superiority of HFOV over protective conventional mechanical ventilation (CV). One of the accepted explanations is that CV and HFOV act differently, including gas exchange.
Methods
To investigate a different level of coupling or decoupling between oxygenation and carbon dioxide elimination during CV and HFOV, we conducted a prospective crossover animal study in 11 healthy pigs. In each animal, we found a normocapnic tidal volume (VT) after the lung recruitment maneuver. Then, VT was repeatedly changed over a wide range while keeping constant the levels of PEEP during CV and mean airway pressure during HFOV. Arterial partial pressures of oxygen (PaO2) and carbon dioxide (PaCO2) were recorded. The same procedure was repeated for CV and HFOV in random order.
Results
Changes in PaCO2 intentionally induced by adjustment of VT affected oxygenation more significantly during HFOV than during CV. Increasing VT above its normocapnic value during HFOV caused a significant improvement in oxygenation, whereas improvement in oxygenation during CV hyperventilation was limited. Any decrease in VT during HFOV caused a rapid worsening of oxygenation compared to CV.
Conclusion
A change in PaCO2 induced by the manipulation of tidal volume inevitably brings with it a change in oxygenation, while this effect on oxygenation is significantly greater in HFOV compared to CV.
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See KC. Acute cor pulmonale in patients with acute respiratory distress syndrome: A comprehensive review. World J Crit Care Med 2021; 10:35-42. [PMID: 33728264 PMCID: PMC7941786 DOI: 10.5492/wjccm.v10.i2.35] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 01/01/2021] [Accepted: 01/28/2021] [Indexed: 02/06/2023] Open
Abstract
Acute respiratory distress syndrome (ARDS)-related acute cor pulmonale (ACP) is found in 8%-50% of all patients with ARDS, and is associated with adverse hemodynamic and survival outcomes. ARDS-related ACP is an echocardiographic diagnosis marked by combined right ventricular dilatation and septal dyskinesia, which connote simultaneous diastolic (volume) and systolic (pressure) overload respectively. Risk factors include pneumonia, hypercapnia, hypoxemia, high airway pressures and concomitant pulmonary disease. Current evidence suggests that ARDS-related ACP is amenable to multimodal treatments including ventilator adjustment (aiming for arterial partial pressure of carbon dioxide < 60 mmHg, plateau pressure < 27 cmH2O, driving pressure < 17 cmH2O), prone positioning, fluid balance optimization and pharmacotherapy. Further research is required to elucidate the optimal frequency and duration of routine bedside echocardiography screening for ARDS-related ACP, to more clearly delineate the diagnostic role of transthoracic echocardiography relative to transesophageal echocardiography, and to validate current and novel therapies.
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Affiliation(s)
- Kay Choong See
- Department of Medicine, National University Hospital, Singapore 119228, Singapore
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6
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Butler AD, Dominick CL, Yehya N. High frequency percussive ventilation in pediatric acute respiratory failure. Pediatr Pulmonol 2021; 56:502-508. [PMID: 33258557 PMCID: PMC7902396 DOI: 10.1002/ppul.25191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 11/20/2020] [Accepted: 11/24/2020] [Indexed: 11/07/2022]
Abstract
OBJECTIVE High frequency percussive ventilation (HFPV) is used in acute respiratory failure, but is poorly described in pediatrics. We aimed to describe the clinical characteristics, ventilator settings, and outcomes of a large pediatric cohort, and to determine predictors of who would benefit from HFPV. HYPOTHESIS Gas exchange 2 h after HFPV initiation predicts success. DESIGN Single center retrospective cohort study testing association between gas exchange 2 h after HFPV initiation with success, defined a priori. PATIENTS Intubated children on HFPV for ≥2 h from 2012 to 2018. METHODS We described indications, ventilator settings, and gas exchange immediately before, 2 h after, and at termination of HFPV. Univariate and multivariate regression tested association of oxygenation and ventilation after HFPV initiation with success. Areas under the receiver operating characteristic (AUROC) curve and adjusted odds ratios (aORs) were computed. RESULTS We performed 237 courses of HFPV in 193 children (22% non-survivors), of which 162 (68%) were successful. In univariate analysis, pH (AUROC, 0.65) and PCO2 (AUROC, 0.66) 2 h after HFPV predicted success. In multivariate analysis, pH (aOR: 1.67 per 1 SD; 95% confidence interval [CI]: 1.19-2.35), PCO2 (aOR: 0.49 per 1 SD; 95% CI: 0.31-0.79), and oxygenation index (aOR: 0.66 per 1 SD; 95% CI: 0.44-0.97) 2 h after HFPV initiation were associated with success. CONCLUSION We describe the largest cohort of HFPV to date, with detailed description of indications and settings. Gas exchange after 2 h of HFPV was independently associated with success.
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Affiliation(s)
- Andrew D Butler
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia and University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Cheryl L Dominick
- Department of Respiratory Therapy, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Nadir Yehya
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia and University of Pennsylvania, Philadelphia, Pennsylvania, USA
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High-Frequency Oscillatory Ventilation and Ventilator-Induced Lung Injury: Size Does Matter. Crit Care Med 2020; 48:e66-e73. [PMID: 31634232 DOI: 10.1097/ccm.0000000000004073] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The theoretical basis for minimizing tidal volume during high-frequency oscillatory ventilation may not be appropriate when lung tissue stretch occurs heterogeneously and/or rapidly. The objective of this study was to assess the extent to which increased ventilation heterogeneity may contribute to ventilator-induced lung injury during high-frequency oscillatory ventilation in adults compared with neonates on the basis of lung size, using a computational model of human lungs. DESIGN Computational modeling study. SETTING Research laboratory. SUBJECTS High-fidelity, 3D computational models of human lungs, scaled to various sizes representative of neonates, children, and adults, with varying injury severity. All models were generated from one thoracic CT image of a healthy adult male. INTERVENTIONS Oscillatory ventilation was simulated in each lung model at frequencies ranging from 0.2 to 40 Hz. Sinusoidal flow oscillations were delivered at the airway opening of each model and distributed through the lungs according to regional parenchymal mechanics. MEASUREMENTS AND MAIN RESULTS Acinar flow heterogeneity was assessed by the coefficient of variation in flow magnitudes across all acini in each model. High-frequency oscillatory ventilation simulations demonstrated increasing heterogeneity of regional parenchymal flow with increasing lung size, with decreasing ratio of deadspace to total acinar volume, and with increasing frequency above lung corner frequency and resonant frequency. Potential for resonant amplification was greatest in injured adult-sized lungs with higher regional quality factors indicating the presence of underdamped lung regions. CONCLUSIONS The potential for ventilator-induced lung injury during high-frequency oscillatory ventilation is enhanced at frequencies above lung corner frequency or resonant frequency despite reduced tidal volumes, especially in adults, due to regional amplification of heterogeneous flow. Measurements of corner frequency and resonant frequency should be considered during high-frequency oscillatory ventilation management.
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8
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Liu S, Zhao Z, Tan L, Wang L, Möller K, Frerichs I, Yu T, Huang Y, Pan C, Yang Y, Qiu H. Optimal mean airway pressure during high-frequency oscillatory ventilation in an experimental model of acute respiratory distress syndrome: EIT-based method. Ann Intensive Care 2020; 10:31. [PMID: 32144514 PMCID: PMC7060304 DOI: 10.1186/s13613-020-0647-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 02/26/2020] [Indexed: 12/26/2022] Open
Abstract
Background High-frequency oscillatory ventilation (HFOV) may theoretically provide lung protective ventilation. The negative clinical results may be due to inadequate mean airway pressure (mPaw) settings in HFOV. Our objective was to evaluate the air distribution, ventilatory and hemodynamic effects of individual mPaw titration during HFOV in ARDS animal based on oxygenation and electrical impedance tomography (EIT). Methods ARDS was introduced with repeated bronchoalveolar lavage followed by injurious mechanical ventilation in ten healthy male pigs (51.2 ± 1.9 kg). Settings of HFOV were 9 Hz (respiratory frequency), 33% (inspiratory time) and 70 cmH2O (∆pressure). After lung recruitment, the mPaw was reduced in steps of 3 cmH2O every 6 min. Hemodynamics and blood gases were obtained in each step. Regional ventilation distribution was determined with EIT. Results PaO2/FiO2 decreased significantly during the mPaw decremental phase (p < 0.001). Lung overdistended regions decreased, while recruitable regions increased as mPaw decreased. The optimal mPaw with respect to PaO2/FiO2 was 21 (18.0–21.0) cmH2O, that is comparable to EIT-based center of ventilation (EIT-CoV) and EIT-collapse/over, 19.5 (15.0–21.0) and 19.5 (18.0–21.8), respectively (p = 0.07). EIT-CoV decreasing along with mPaw decrease revealed redistribution toward non-dependent regions. The individual mPaw titrated by EIT-based indices improved regional ventilation distribution with respect to overdistension and collapse (p = 0.035). Conclusion Our data suggested personalized optimal mPaw titration by EIT-based indices improves regional ventilation distribution and lung homogeneity during high-frequency oscillatory ventilation.
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Affiliation(s)
- Songqiao Liu
- Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Jiangsu Province, Nanjing, 210009, China
| | - Zhanqi Zhao
- Institute of Technical Medicine, Furtwangen University, Jakob-Kienzle Strasse 17, 78054, VS-Schwenningen, Germany.,Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China
| | - Li Tan
- Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Jiangsu Province, Nanjing, 210009, China.,Department of Critical Care Medicine, Beijing Tongren Hospital, Capital Medical University, Bejing, 100730, China
| | - Lihui Wang
- Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Jiangsu Province, Nanjing, 210009, China
| | - Knut Möller
- Institute of Technical Medicine, Furtwangen University, Jakob-Kienzle Strasse 17, 78054, VS-Schwenningen, Germany
| | - Inéz Frerichs
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center of Schleswig-Holstein Campus Kiel, Arnold-Heller-Strasse 3, 24105, Kiel, Germany
| | - Tao Yu
- Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Jiangsu Province, Nanjing, 210009, China
| | - Yingzi Huang
- Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Jiangsu Province, Nanjing, 210009, China
| | - Chun Pan
- Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Jiangsu Province, Nanjing, 210009, China
| | - Yi Yang
- Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Jiangsu Province, Nanjing, 210009, China
| | - Haibo Qiu
- Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Jiangsu Province, Nanjing, 210009, China.
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Wong JJM, Liu S, Dang H, Anantasit N, Phan PH, Phumeetham S, Qian S, Ong JSM, Gan CS, Chor YK, Samransamruajkit R, Loh TF, Feng M, Lee JH. The impact of high frequency oscillatory ventilation on mortality in paediatric acute respiratory distress syndrome. Crit Care 2020; 24:31. [PMID: 32005285 PMCID: PMC6995130 DOI: 10.1186/s13054-020-2741-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 01/14/2020] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND High-frequency oscillatory ventilation (HFOV) use was associated with greater mortality in adult acute respiratory distress syndrome (ARDS). Nevertheless, HFOV is still frequently used as rescue therapy in paediatric acute respiratory distress syndrome (PARDS). In view of the limited evidence for HFOV in PARDS and evidence demonstrating harm in adult patients with ARDS, we hypothesized that HFOV use compared to other modes of mechanical ventilation is associated with increased mortality in PARDS. METHODS Patients with PARDS from 10 paediatric intensive care units across Asia from 2009 to 2015 were identified. Data on epidemiology and clinical outcomes were collected. Patients on HFOV were compared to patients on other modes of ventilation. The primary outcome was 28-day mortality and secondary outcomes were 28-day ventilator- (VFD) and intensive care unit- (IFD) free days. Genetic matching (GM) method was used to analyse the association between HFOV treatment with the primary outcome. Additionally, we performed a sensitivity analysis, including propensity score (PS) matching, inverse probability of treatment weighting (IPTW) and marginal structural modelling (MSM) to estimate the treatment effect. RESULTS A total of 328 patients were included. In the first 7 days of PARDS, 122/328 (37.2%) patients were supported with HFOV. There were significant differences in baseline oxygenation index (OI) between the HFOV and non-HFOV groups (18.8 [12.0, 30.2] vs. 7.7 [5.1, 13.1] respectively; p < 0.001). A total of 118 pairs were matched in the GM method which found a significant association between HFOV with 28-day mortality in PARDS [odds ratio 2.3, 95% confidence interval (CI) 1.3, 4.4, p value 0.01]. VFD was indifferent between the HFOV and non-HFOV group [mean difference - 1.3 (95%CI - 3.4, 0.9); p = 0.29] but IFD was significantly lower in the HFOV group [- 2.5 (95%CI - 4.9, - 0.5); p = 0.03]. From the sensitivity analysis, PS matching, IPTW and MSM all showed consistent direction of HFOV treatment effect in PARDS. CONCLUSION The use of HFOV was associated with increased 28-day mortality in PARDS. This study suggests caution but does not eliminate equivocality and a randomized controlled trial is justified to examine the true association.
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Affiliation(s)
- Judith Ju-Ming Wong
- Children's Intensive Care Unit, Department of Pediatric Subspecialties, KK Women's and Children's Hospital, 100 Bukit Timah Road, Singapore, 229899, Singapore.
| | - Siqi Liu
- Saw Swee Hock School of Public Health, National University Health System, NUS Graduate School for Integrative Science and Engineering, National University of Singapore, 12 Science Drive 2, Singapore, 117549, Singapore
| | - Hongxing Dang
- Pediatric Intensive Care Unit, Children's Hospital of Chongqing Medical University, 136 Zhongshan 2nd Rd, Yuzhong district, Chongqing, 400041, China
| | - Nattachai Anantasit
- Ramathibodi Hospital, Mahidol University, 270 Rama VI Road, Ratchathewi, Bangkok, 10400, Thailand
| | - Phuc Huu Phan
- National Children's Hospital, 18/879 La Thành, Láng Thượng, Đống Đa, Hanoi, Vietnam
| | - Suwannee Phumeetham
- Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road Bangkoknoi, Bangkok, 10700, Thailand
| | - Suyun Qian
- Beijing Children's Hospital, Capital Medical University, 56 Nanlishi Rd, Xicheng District, Beijing, 100045, China
| | - Jacqueline Soo May Ong
- Khoo Teck Puat-National University Children's Medical Institute, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Chin Seng Gan
- Department of Pediatrics, University of Malaya. Jalan Universiti, 50603, Wilayah Persekutuan, Kuala Lumpur, Malaysia
| | - Yek Kee Chor
- Sarawak General Hospital, Jalan Hospital, 93586, Kuching, Sarawak, Malaysia
| | - Rujipat Samransamruajkit
- Critical Care Excellence Center, King Chulalongkorn Memorial Hospital, Faculty of Medicine, Chulalongkorn University Bangkok, Bangkok, 10330, Thailand
| | - Tsee Foong Loh
- Children's Intensive Care Unit, Department of Pediatric Subspecialties, KK Women's and Children's Hospital, 100 Bukit Timah Road, Singapore, 229899, Singapore
| | - Mengling Feng
- Saw Swee Hock School of Public Health, National University Health System, NUS Graduate School for Integrative Science and Engineering, National University of Singapore, 12 Science Drive 2, Singapore, 117549, Singapore
| | - Jan Hau Lee
- Children's Intensive Care Unit, Department of Pediatric Subspecialties, KK Women's and Children's Hospital, 100 Bukit Timah Road, Singapore, 229899, Singapore
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10
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Magunia H, Jordanow A, Keller M, Rosenberger P, Nowak-Machen M. The effects of anesthesia induction and positive pressure ventilation on right-ventricular function: an echocardiography-based prospective observational study. BMC Anesthesiol 2019; 19:199. [PMID: 31684877 PMCID: PMC6829832 DOI: 10.1186/s12871-019-0870-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 10/17/2019] [Indexed: 01/08/2023] Open
Abstract
Background General anesthesia induction with the initiation of positive pressure ventilation creates a vulnerable phase for patients. The impact of positive intrathoracic pressure on cardiac performance has been studied but remains controversial. 3D echocardiography is a valid and MRI-validated bed-side tool to evaluate the right ventricle (RV). The aim of this study was to assess the impact of anesthesia induction (using midazolam, sufentanil and rocuronium, followed by sevoflurane) with positive pressure ventilation (PEEP 5, tidal volume 6–8 ml/kg) on 2D and 3D echocardiography derived parameters of RV function. Methods A prospective observational study on fifty-three patients undergoing elective cardiac surgery in a tertiary care university hospital was designed. Transthoracic echocardiography exams were performed before and immediately after anesthesia induction and were recorded together with hemodynamic parameters and ventilator settings. Results After anesthesia induction TAPSE (mean difference − 1.6 mm (95% CI − 2.6 mm to − 0.7 mm; p = 0.0013) as well as the Tissue Doppler derived tricuspid annulus peak velocity (TDITVs’) were significantly reduced (mean difference − 1.9% (95% CI: − 2.6 to − 1.2; p < 0.0001), but global right ventricular ejection fraction (RVEF; p = 0.1607) and right ventricular stroke volume (RVSV; p = 0.1838) did not change. Conclusions This data shows a preserved right ventricular ejection fraction and right ventricular stroke volume after anesthesia induction and initiation of positive pressure ventilation. However, the baso-apical right ventricular function is significantly reduced. Larger studies are needed in order to determine the clinical impact of these findings especially in patients presenting with impaired right ventricular function before anesthesia induction. Trial registration Retrospecitvely registered, 6th June 2016, ClinicalTrials.gov Identifier NCT02820727.
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Affiliation(s)
- Harry Magunia
- Department of Anaesthesiology and Intensive Care Medicine, University Hospital Tübingen, Eberhard-Karls-University Tübingen, Hoppe-Seyler-Str. 3, 72076, Tübingen, Germany.
| | - Anne Jordanow
- Department of Anaesthesiology and Intensive Care Medicine, University Hospital Tübingen, Eberhard-Karls-University Tübingen, Hoppe-Seyler-Str. 3, 72076, Tübingen, Germany
| | - Marius Keller
- Department of Anaesthesiology and Intensive Care Medicine, University Hospital Tübingen, Eberhard-Karls-University Tübingen, Hoppe-Seyler-Str. 3, 72076, Tübingen, Germany
| | - Peter Rosenberger
- Department of Anaesthesiology and Intensive Care Medicine, University Hospital Tübingen, Eberhard-Karls-University Tübingen, Hoppe-Seyler-Str. 3, 72076, Tübingen, Germany
| | - Martina Nowak-Machen
- Department of Anaesthesiology and Intensive Care Medicine, University Hospital Tübingen, Eberhard-Karls-University Tübingen, Hoppe-Seyler-Str. 3, 72076, Tübingen, Germany.,Department of Anesthesia and Intensive Care Medicine, Klinikum Ingolstadt, Krumenauerstr. 25, 85049, Ingolstadt, Germany
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Papazian L, Aubron C, Brochard L, Chiche JD, Combes A, Dreyfuss D, Forel JM, Guérin C, Jaber S, Mekontso-Dessap A, Mercat A, Richard JC, Roux D, Vieillard-Baron A, Faure H. Formal guidelines: management of acute respiratory distress syndrome. Ann Intensive Care 2019. [PMID: 31197492 DOI: 10.1186/s13613-019-0540-9.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Fifteen recommendations and a therapeutic algorithm regarding the management of acute respiratory distress syndrome (ARDS) at the early phase in adults are proposed. The Grade of Recommendation Assessment, Development and Evaluation (GRADE) methodology has been followed. Four recommendations (low tidal volume, plateau pressure limitation, no oscillatory ventilation, and prone position) had a high level of proof (GRADE 1 + or 1 -); four (high positive end-expiratory pressure [PEEP] in moderate and severe ARDS, muscle relaxants, recruitment maneuvers, and venovenous extracorporeal membrane oxygenation [ECMO]) a low level of proof (GRADE 2 + or 2 -); seven (surveillance, tidal volume for non ARDS mechanically ventilated patients, tidal volume limitation in the presence of low plateau pressure, PEEP > 5 cmH2O, high PEEP in the absence of deleterious effect, pressure mode allowing spontaneous ventilation after the acute phase, and nitric oxide) corresponded to a level of proof that did not allow use of the GRADE classification and were expert opinions. Lastly, for three aspects of ARDS management (driving pressure, early spontaneous ventilation, and extracorporeal carbon dioxide removal), the experts concluded that no sound recommendation was possible given current knowledge. The recommendations and the therapeutic algorithm were approved by the experts with strong agreement.
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Affiliation(s)
- Laurent Papazian
- Service de Médecine Intensive - Réanimation, Hôpital Nord, Chemin des Bourrely, 13015, Marseille, France.
| | - Cécile Aubron
- Medical Intensive Care Unit, Centre Hospitalier Régional et Universitaire de Brest, site La Cavale Blanche, Bvd Tanguy Prigent, 29609, Brest Cedex, France
| | - Laurent Brochard
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
| | - Jean-Daniel Chiche
- Service de Médecine Intensive - Réanimation, Hôpital Cochin, Hôpitaux Universitaires Paris-Centre, Assistance Publique - Hôpitaux de Paris, 27 Rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Alain Combes
- Service de Réanimation, Institut de Cardiologie, Groupe Hospitalier Pitié- Salpêtrière, Assistance Publique-Hôpitaux de Paris, 47, boulevard de l'Hôpital, 75013, Paris, France
| | - Didier Dreyfuss
- Intensive Care Unit, Louis Mourier Hospital, AP-HP, 178 Rue des Renouillers, 92700, Colombes, France
| | - Jean-Marie Forel
- Service de Médecine Intensive - Réanimation, Hôpital Nord, Chemin des Bourrely, 13015, Marseille, France
| | - Claude Guérin
- Service de Réanimation Médicale, Hôpital De La Croix Rousse, Hospices Civils de Lyon, 103 Grande Rue de la Croix Rousse, 69004, Lyon, France
| | - Samir Jaber
- Department of Anesthesiology and Intensive Care (DAR B), Saint Eloi University Hospital, Montpellier, France
| | - Armand Mekontso-Dessap
- Service de Réanimation Médicale, Hôpitaux Universitaires Henri-Mondor, AP-HP, DHU A-TVB, 94010, Créteil, France
| | - Alain Mercat
- Medical Intensive Care Department, Angers University Hospital, 4, rue Larrey, 49933, Angers Cedex, France
| | | | - Damien Roux
- Intensive Care Unit, Louis Mourier Hospital, AP-HP, 178 Rue des Renouillers, 92700, Colombes, France
| | | | - Henri Faure
- Service de Médecine Intensive - Réanimation, Centre Hospitalier Intercommunal Robert Ballanger, 93602, Aulnay-sous-Bois, France
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12
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Papazian L, Aubron C, Brochard L, Chiche JD, Combes A, Dreyfuss D, Forel JM, Guérin C, Jaber S, Mekontso-Dessap A, Mercat A, Richard JC, Roux D, Vieillard-Baron A, Faure H. Formal guidelines: management of acute respiratory distress syndrome. Ann Intensive Care 2019; 9:69. [PMID: 31197492 PMCID: PMC6565761 DOI: 10.1186/s13613-019-0540-9] [Citation(s) in RCA: 410] [Impact Index Per Article: 82.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 05/27/2019] [Indexed: 12/16/2022] Open
Abstract
Fifteen recommendations and a therapeutic algorithm regarding the management of acute respiratory distress syndrome (ARDS) at the early phase in adults are proposed. The Grade of Recommendation Assessment, Development and Evaluation (GRADE) methodology has been followed. Four recommendations (low tidal volume, plateau pressure limitation, no oscillatory ventilation, and prone position) had a high level of proof (GRADE 1 + or 1 −); four (high positive end-expiratory pressure [PEEP] in moderate and severe ARDS, muscle relaxants, recruitment maneuvers, and venovenous extracorporeal membrane oxygenation [ECMO]) a low level of proof (GRADE 2 + or 2 −); seven (surveillance, tidal volume for non ARDS mechanically ventilated patients, tidal volume limitation in the presence of low plateau pressure, PEEP > 5 cmH2O, high PEEP in the absence of deleterious effect, pressure mode allowing spontaneous ventilation after the acute phase, and nitric oxide) corresponded to a level of proof that did not allow use of the GRADE classification and were expert opinions. Lastly, for three aspects of ARDS management (driving pressure, early spontaneous ventilation, and extracorporeal carbon dioxide removal), the experts concluded that no sound recommendation was possible given current knowledge. The recommendations and the therapeutic algorithm were approved by the experts with strong agreement.
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Affiliation(s)
- Laurent Papazian
- Service de Médecine Intensive - Réanimation, Hôpital Nord, Chemin des Bourrely, 13015, Marseille, France.
| | - Cécile Aubron
- Medical Intensive Care Unit, Centre Hospitalier Régional et Universitaire de Brest, site La Cavale Blanche, Bvd Tanguy Prigent, 29609, Brest Cedex, France
| | - Laurent Brochard
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
| | - Jean-Daniel Chiche
- Service de Médecine Intensive - Réanimation, Hôpital Cochin, Hôpitaux Universitaires Paris-Centre, Assistance Publique - Hôpitaux de Paris, 27 Rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Alain Combes
- Service de Réanimation, Institut de Cardiologie, Groupe Hospitalier Pitié- Salpêtrière, Assistance Publique-Hôpitaux de Paris, 47, boulevard de l'Hôpital, 75013, Paris, France
| | - Didier Dreyfuss
- Intensive Care Unit, Louis Mourier Hospital, AP-HP, 178 Rue des Renouillers, 92700, Colombes, France
| | - Jean-Marie Forel
- Service de Médecine Intensive - Réanimation, Hôpital Nord, Chemin des Bourrely, 13015, Marseille, France
| | - Claude Guérin
- Service de Réanimation Médicale, Hôpital De La Croix Rousse, Hospices Civils de Lyon, 103 Grande Rue de la Croix Rousse, 69004, Lyon, France
| | - Samir Jaber
- Department of Anesthesiology and Intensive Care (DAR B), Saint Eloi University Hospital, Montpellier, France
| | - Armand Mekontso-Dessap
- Service de Réanimation Médicale, Hôpitaux Universitaires Henri-Mondor, AP-HP, DHU A-TVB, 94010, Créteil, France
| | - Alain Mercat
- Medical Intensive Care Department, Angers University Hospital, 4, rue Larrey, 49933, Angers Cedex, France
| | | | - Damien Roux
- Intensive Care Unit, Louis Mourier Hospital, AP-HP, 178 Rue des Renouillers, 92700, Colombes, France
| | | | - Henri Faure
- Service de Médecine Intensive - Réanimation, Centre Hospitalier Intercommunal Robert Ballanger, 93602, Aulnay-sous-Bois, France
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13
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Mohamed SAR, Mohamed NN. Efficacy and adverse events of early high-frequency oscillatory ventilation in adult burn patients with acute respiratory distress syndrome. EGYPTIAN JOURNAL OF ANAESTHESIA 2019. [DOI: 10.1016/j.egja.2016.01.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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14
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Sklar MC, Patel BK, Beitler JR, Piraino T, Goligher EC. Optimal Ventilator Strategies in Acute Respiratory Distress Syndrome. Semin Respir Crit Care Med 2019; 40:81-93. [PMID: 31060090 PMCID: PMC7117088 DOI: 10.1055/s-0039-1683896] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Mechanical ventilation practices in patients with acute respiratory distress syndrome (ARDS) have progressed with a growing understanding of the disease pathophysiology. Paramount to the care of affected patients is the delivery of lung-protective mechanical ventilation which prioritizes tidal volume and plateau pressure limitation. Lung protection can probably be further enhanced by scaling target tidal volumes to the specific respiratory mechanics of individual patients. The best procedure for selecting optimal positive end-expiratory pressure (PEEP) in ARDS remains uncertain; several relevant issues must be considered when selecting PEEP, particularly lung recruitability. Noninvasive ventilation must be used with caution in ARDS as excessively high respiratory drive can further exacerbate lung injury; newer modes of delivery offer promising approaches in hypoxemic respiratory failure. Airway pressure release ventilation offers an alternative approach to maximize lung recruitment and oxygenation, but clinical trials have not demonstrated a survival benefit of this mode over conventional ventilation strategies. Rescue therapy with high-frequency oscillatory ventilation is an important option in refractory hypoxemia. Despite a disappointing lack of benefit (and possible harm) in patients with moderate or severe ARDS, possibly due to lung hyperdistention and right ventricular dysfunction, high-frequency oscillation may improve outcome in patients with very severe hypoxemia.
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Affiliation(s)
- Michael C Sklar
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Bhakti K Patel
- Section of Pulmonary and Critical Care, Department of Medicine, University of Chicago, Chicago, Illinois
| | - Jeremy R Beitler
- Center for Acute Respiratory Failure and Division of Pulmonary, Allergy, and Critical Care Medicine, Columbia University, New York, New York
| | - Thomas Piraino
- Keenan Centre for Biomedical Research, St. Michael's Hospital, Toronto, Ontario, Canada.,Division of Critical Care, Department of Anesthesia, McMaster University, Hamilton, Ontario, Canada.,Department of Respiratory Therapy, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Ewan C Goligher
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Ontario, Canada.,Toronto General Hospital Research Institute, Toronto, Ontario, Canada.,Department of Medicine, Division of Respirology, University Health Network, Toronto, Ontario, Canada
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15
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Mentzelopoulos SD, Anninos H, Malachias S, Zakynthinos SG. "Low-" versus "high"-frequency oscillation and right ventricular function in ARDS. A randomized crossover study. J Intensive Care 2018; 6:58. [PMID: 30202530 PMCID: PMC6122746 DOI: 10.1186/s40560-018-0327-3] [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: 07/04/2018] [Accepted: 08/22/2018] [Indexed: 11/10/2022] Open
Abstract
Background Recent, large trials of high-frequency oscillation (HFO) versus conventional ventilation (CV) in acute respiratory distress syndrome (ARDS) reported negative results. This could be explained by an HFO-induced right ventricular (RV) dysfunction/failure due to high intrathoracic pressures and hypercapnia. We hypothesized that HFO strategies aimed at averting/attenuating hypercapnia, such as "low-frequency" (i.e., 4 Hz) HFO and 4-Hz HFO with tracheal-gas insufflation (HFO-TGI), may result in an improved RV function relative to "high-frequency" (i.e., 7 Hz) HFO (which may promote hypercapnia) and similar RV function relative to lung protective CV. Methods We studied 17 patients with moderate-to-severe ARDS [PaO2-to-inspiratory O2 fraction ratio (PaO2/FiO2) < 150]. RV function was assessed by transesophageal echocardiography (TEE). Patients received 60 min of CV for TEE-guided, positive end-expiratory pressure (PEEP) "optimization" and subsequent stabilization; 60 min of 4-Hz HFO for "study mean airway pressure (mPaw)" titration to peripheral oxygen saturation ≥ 95%, without worsening RV function as assessed by TEE; 60 min of each tested HFO strategy in random order; and another 60 min of CV using the pre-HFO, TEE-guided PEEP setting. Study measurements (i.e., gas exchange, hemodynamics, and TEE data) were obtained over the last 10 min of pre-HFO CV, of each one of the three tested HFO strategies, and of post-HFO CV. Results The mean "study HFO mPaw" was 8-10 cmH2O higher relative to pre-HFO CV. Seven-Hz HFO versus 4-Hz HFO and 4-Hz HFO-TGI resulted in higher mean ± SD right-to-left ventricular end-diastolic area ratio (RVEDA/LVEDA) (0.64 ± 0.15 versus 0.56 ± 0.14 and 0.52 ± 0.10, respectively, both p < 0.05). Higher diastolic/systolic eccentricity indexes (1.33 ± 0.19/1.42 ± 0.17 versus 1.21 ± 0.10/1.26 ± 0.10 and 1.17 ± 0.11/1.17 ± 0.13, respectively, all p < 0.05). Seven-Hz HFO resulted in 18-28% higher PaCO2 relative to all other ventilatory strategies (all p < 0.05). Four-Hz HFO-TGI versus pre-HFO CV resulted in 15% lower RVEDA/LVEDA, and 7%/10% lower diastolic/systolic eccentricity indexes (all p < 0.05). Mean PaO2/FiO2 improved by 77-80% during HFO strategies versus CV (all p < 0.05). Mean cardiac index varied by ≤ 10% among strategies. Percent changes in PaCO2 among strategies were predictive of concurrent percent changes in measures of RV function (R2 = 0.21-0.43). Conclusions In moderate-to-severe ARDS, "short-term" 4-Hz HFO strategies resulted in better RV function versus 7-Hz HFO, partly attributable to improved PaCO2 control, and similar or improved RV function versus CV. Trial registration This study was registered 40 days prior to the enrollment of the first patient at ClinicalTrials.gov, ID no. NCT02027129, Principal Investigator Spyros D. Mentzelopoulos, date of registration January 3, 2014.
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Affiliation(s)
- Spyros D Mentzelopoulos
- First Department of Intensive Care Medicine, National and Kapodestrian University of Athens Medical School, Evaggelismos General Hospital, 45-47 Ipsilandou Street, GR-10675 Athens, Greece
| | - Hector Anninos
- First Department of Intensive Care Medicine, National and Kapodestrian University of Athens Medical School, Evaggelismos General Hospital, 45-47 Ipsilandou Street, GR-10675 Athens, Greece
| | - Sotirios Malachias
- First Department of Intensive Care Medicine, National and Kapodestrian University of Athens Medical School, Evaggelismos General Hospital, 45-47 Ipsilandou Street, GR-10675 Athens, Greece
| | - Spyros G Zakynthinos
- First Department of Intensive Care Medicine, National and Kapodestrian University of Athens Medical School, Evaggelismos General Hospital, 45-47 Ipsilandou Street, GR-10675 Athens, Greece
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16
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Mechanical Ventilation in Adults with Acute Respiratory Distress Syndrome. Summary of the Experimental Evidence for the Clinical Practice Guideline. Ann Am Thorac Soc 2018; 14:S261-S270. [PMID: 28985479 DOI: 10.1513/annalsats.201704-345ot] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
RATIONALE The American Thoracic Society/European Society for Intensive Care Medicine/Society of Critical Care Medicine guidelines on mechanical ventilation in adult patients with acute respiratory distress syndrome (ARDS) provide treatment recommendations derived from a thorough analysis of the clinical evidence on six clinical interventions. However, each of the recommendations contains areas of uncertainty and controversy, which may affect their appropriate clinical application. OBJECTIVES To provide a critical review of the experimental evidence surrounding the pathophysiology of ventilator-induced lung injury and to help clinicians apply the clinical recommendations to individual patients. METHODS We conducted a literature search and narrative review. RESULTS A large number of experimental studies have been performed with the aim of improving understanding of the pathophysiological effects of mechanical ventilation. These studies have formed the basis for the design of many clinical trials. Translational research has fundamentally advanced understanding of the mechanisms of ventilator-induced lung injury, thus informing the design of interventions that improve survival in patients with ARDS. CONCLUSIONS Because daily management of patients with ARDS presents the challenge of competing considerations, clinicians should consider the mechanism of ventilator-induced lung injury, as well as the rationale for interventions designed to mitigate it, when applying evidence-based recommendations at the bedside.
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Abstract
PURPOSE OF REVIEW In light of emerging data from clinical trials, the place of high-frequency oscillatory ventilation (HFOV) in the management of acute respiratory distress syndrome (ARDS) is uncertain. This review provides an overview of these new clinical data and also explores new areas of investigation for HFOV in adults. RECENT FINDINGS While prior meta-analyses suggested benefit for HFOV, updated systematic reviews published this year, which include two large recent clinical trials, now show no statistically significant impact of HFOV on mortality in adults with ARDS. It is possible that HFOV would be safer and more effective with a more individualized approach to setting mean airway pressure (mPaw). Possible techniques to achieve this include titrating mPaw in response to oxygenation or hemodynamic changes after HFOV initiation, by measuring respiratory system impedance, or by following echocardiographic changes. SUMMARY Although not first-line, HFOV remains a tool in the armamentarium of the intensivist managing the patient with severe ARDS and refractory hypoxemia. A refinement in the approach to delivering HFOV is warranted, with more attention paid to its adverse hemodynamic consequences.
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18
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Huang SJ, Nalos M, Smith L, Rajamani A, McLean AS. The use of echocardiographic indices in defining and assessing right ventricular systolic function in critical care research. Intensive Care Med 2018; 44:868-883. [PMID: 29789861 DOI: 10.1007/s00134-018-5211-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 05/05/2018] [Indexed: 01/25/2023]
Abstract
PURPOSE Many echocardiographic indices (or methods) for assessing right ventricular (RV) function are available, but each has its strengths and limitations. In some cases, there might be discordance between the indices. We conducted a systematic review to audit the echocardiographic RV assessments in critical care research to see if a consistent pattern existed. We specifically looked into the kind and number of RV indices used, and how RV dysfunction was defined in each study. METHODS Studies conducted in critical care settings and reported echocardiographic RV function indices from 1997 to 2017 were searched systematically from three databases. Non-adult studies, case reports, reviews and secondary studies were excluded. These studies' characteristics and RV indices reported were summarized. RESULTS Out of 495 non-duplicated publications found, 81 studies were included in our systematic review. There has been an increasing trend of studying RV function by echocardiography since 2001, and most were conducted in ICU. Thirty-one studies use a single index, mostly TAPSE, to define RV dysfunction; 33 used composite indices and the combinations varied between studies. Seventeen studies did not define RV dysfunction. For those using composite indices, many did not explain their choices. CONCLUSIONS TAPSE seemed to be the most popular index in the last 2-3 years. Many studies used combinations of indices but, apart from cor pulmonale, we could not find a consistent pattern of RV assessment and definition of RV dysfunction amongst these studies.
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Affiliation(s)
- Stephen J Huang
- Department of Intensive Care Medicine, Nepean Hospital, Sydney Medical School, The University of Sydney, Sydney, NSW, Australia.
| | - Marek Nalos
- Department of Intensive Care Medicine, Nepean Hospital, Sydney Medical School, The University of Sydney, Sydney, NSW, Australia
| | - Louise Smith
- Cardiovascular Ultrasound Laboratory, Intensive Care Unit, Nepean Hospital, Sydney, NSW, Australia
| | - Arvind Rajamani
- Department of Intensive Care Medicine, Nepean Hospital, Sydney Medical School, The University of Sydney, Sydney, NSW, Australia
| | - Anthony S McLean
- Department of Intensive Care Medicine, Nepean Hospital, Sydney Medical School, The University of Sydney, Sydney, NSW, Australia
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19
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Klapsing P, Moerer O, Wende C, Herrmann P, Quintel M, Bleckmann A, Heuer JF. High-frequency oscillatory ventilation guided by transpulmonary pressure in acute respiratory syndrome: an experimental study in pigs. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2018; 22:121. [PMID: 29743121 PMCID: PMC5943989 DOI: 10.1186/s13054-018-2028-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 04/05/2018] [Indexed: 12/20/2022]
Abstract
BACKGROUND Recent clinical studies have not shown an overall benefit of high-frequency oscillatory ventilation (HFOV), possibly due to injurious or non-individualized HFOV settings. We compared conventional HFOV (HFOVcon) settings with HFOV settings based on mean transpulmonary pressures (PLmean) in an animal model of experimental acute respiratory distress syndrome (ARDS). METHODS ARDS was induced in eight pigs by intrabronchial installation of hydrochloric acid (0.1 N, pH 1.1; 2.5 ml/kg body weight). The animals were initially ventilated in volume-controlled mode with low tidal volumes (6 ml kg- 1) at three positive end-expiratory pressure (PEEP) levels (5, 10, 20 cmH2O) followed by HFOVcon and then HFOV PLmean each at PEEP 10 and 20. The continuous distending pressure (CDP) during HFOVcon was set at mean airway pressure plus 5 cmH2O. For HFOV PLmean it was set at mean PL plus 5 cmH2O. Baseline measurements were obtained before and after induction of ARDS under volume controlled ventilation with PEEP 5. The same measurements and computer tomography of the thorax were then performed under all ventilatory regimens at PEEP 10 and 20. RESULTS Cardiac output, stroke volume, mean arterial pressure and intrathoracic blood volume index were significantly higher during HFOV PLmean than during HFOVcon at PEEP 20. Lung density, total lung volume, and normally and poorly aerated lung areas were significantly greater during HFOVcon, while there was less over-aerated lung tissue in HFOV PLmean. The groups did not differ in oxygenation or extravascular lung water index. CONCLUSION HFOV PLmean is associated with less hemodynamic compromise and less pulmonary overdistension than HFOVcon. Despite the increase in non-ventilated lung areas, oxygenation improved with both regimens. An individualized approach with HFOV settings based on transpulmonary pressure could be a useful ventilatory strategy in patients with ARDS. Providing alveolar stabilization with HFOV while avoiding harmful distending pressures and pulmonary overdistension might be a key in the context of ventilator-induced lung injury.
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Affiliation(s)
- Philipp Klapsing
- Department of Anesthesiology, Intensive Care Medicine, Emergency Medicine and Pain Management, University Medical Center Göttingen, Göttingen, Germany
| | - Onnen Moerer
- Department of Anesthesiology, Intensive Care Medicine, Emergency Medicine and Pain Management, University Medical Center Göttingen, Göttingen, Germany
| | - Christoph Wende
- Department of Anesthesiology, Intensive Care Medicine, Emergency Medicine and Pain Management, University Medical Center Göttingen, Göttingen, Germany
| | - Peter Herrmann
- Department of Anesthesiology, Intensive Care Medicine, Emergency Medicine and Pain Management, University Medical Center Göttingen, Göttingen, Germany
| | - Michael Quintel
- Department of Anesthesiology, Intensive Care Medicine, Emergency Medicine and Pain Management, University Medical Center Göttingen, Göttingen, Germany
| | - Annalen Bleckmann
- Department of Medical Statistics, University Medical Center Göttingen, Göttingen, Germany
| | - Jan Florian Heuer
- Department of Anesthesiology, Intensive Care Medicine, Emergency Medicine and Pain Management, University Medical Center Göttingen, Göttingen, Germany. .,Department Anesthesiology, Intensive Care Medicine, Emergency Medicine and Pain Management, Augusta-Kliniken Bochum-Mitte, Bochum, Germany.
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Abstract
IMPORTANCE Acute respiratory distress syndrome (ARDS) is a life-threatening form of respiratory failure that affects approximately 200 000 patients each year in the United States, resulting in nearly 75 000 deaths annually. Globally, ARDS accounts for 10% of intensive care unit admissions, representing more than 3 million patients with ARDS annually. OBJECTIVE To review advances in diagnosis and treatment of ARDS over the last 5 years. EVIDENCE REVIEW We searched MEDLINE, EMBASE, and the Cochrane Database of Systematic Reviews from 2012 to 2017 focusing on randomized clinical trials, meta-analyses, systematic reviews, and clinical practice guidelines. Articles were identified for full text review with manual review of bibliographies generating additional references. FINDINGS After screening 1662 citations, 31 articles detailing major advances in the diagnosis or treatment of ARDS were selected. The Berlin definition proposed 3 categories of ARDS based on the severity of hypoxemia: mild (200 mm Hg<Pao2/Fio2≤300 mm Hg), moderate (100 mm Hg<Pao2/Fio2≤200 mm Hg), and severe (Pao2/Fio2 ≤100 mm Hg), along with explicit criteria related to timing of the syndrome's onset, origin of edema, and the chest radiograph findings. The Berlin definition has significantly greater predictive validity for mortality than the prior American-European Consensus Conference definition. Clinician interpretation of the origin of edema and chest radiograph criteria may be less reliable in making a diagnosis of ARDS. The cornerstone of management remains mechanical ventilation, with a goal to minimize ventilator-induced lung injury (VILI). Aspirin was not effective in preventing ARDS in patients at high-risk for the syndrome. Adjunctive interventions to further minimize VILI, such as prone positioning in patients with a Pao2/Fio2 ratio less than 150 mm Hg, were associated with a significant mortality benefit whereas others (eg, extracorporeal carbon dioxide removal) remain experimental. Pharmacologic therapies such as β2 agonists, statins, and keratinocyte growth factor, which targeted pathophysiologic alterations in ARDS, were not beneficial and demonstrated possible harm. Recent guidelines on mechanical ventilation in ARDS provide evidence-based recommendations related to 6 interventions, including low tidal volume and inspiratory pressure ventilation, prone positioning, high-frequency oscillatory ventilation, higher vs lower positive end-expiratory pressure, lung recruitment maneuvers, and extracorporeal membrane oxygenation. CONCLUSIONS AND RELEVANCE The Berlin definition of acute respiratory distress syndrome addressed limitations of the American-European Consensus Conference definition, but poor reliability of some criteria may contribute to underrecognition by clinicians. No pharmacologic treatments aimed at the underlying pathology have been shown to be effective, and management remains supportive with lung-protective mechanical ventilation. Guidelines on mechanical ventilation in patients with acute respiratory distress syndrome can assist clinicians in delivering evidence-based interventions that may lead to improved outcomes.
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Affiliation(s)
- Eddy Fan
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Canada
- Department of Medicine, University Health Network and Sinai Health System, Toronto, Canada
- Department of Medicine, University of Toronto, Toronto, Canada
| | - Daniel Brodie
- Division of Pulmonary, Allergy, and Critical Care Medicine, Columbia University College of Physicians and Surgeons/New York-Presbyterian Hospital, New York
| | - Arthur S Slutsky
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
- Department of Medicine, University of Toronto, Toronto, Canada
- Keenan Research Center, Li Ka Shing Knowledge Institute, St Michael's Hospital, Toronto, Canada
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21
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Coz Yataco A, Aguinaga Meza M, Buch KP, Disselkamp MA. Hospital and intensive care unit management of decompensated pulmonary hypertension and right ventricular failure. Heart Fail Rev 2018; 21:323-46. [PMID: 26486799 PMCID: PMC7102249 DOI: 10.1007/s10741-015-9514-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Pulmonary hypertension and concomitant right ventricular failure present a diagnostic and therapeutic challenge in the intensive care unit and have been associated with a high mortality. Significant co-morbidities and hemodynamic instability are often present, and routine critical care unit resuscitation may worsen hemodynamics and limit the chances of survival in patients with an already underlying poor prognosis. Right ventricular failure results from structural or functional processes that limit the right ventricle’s ability to maintain adequate cardiac output. It is commonly seen as the result of left heart failure, acute pulmonary embolism, progression or decompensation of pulmonary hypertension, sepsis, acute lung injury, or in the perioperative setting. Prompt recognition of the underlying cause and institution of treatment with a thorough understanding of the elements necessary to optimize preload, cardiac contractility, enhance systemic arterial perfusion, and reduce right ventricular afterload are of paramount importance. Moreover, the emergence of previously uncommon entities in patients with pulmonary hypertension (pregnancy, sepsis, liver disease, etc.) and the availability of modern devices to provide support pose additional challenges that must be addressed with an in-depth knowledge of this disease.
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Affiliation(s)
- Angel Coz Yataco
- Department of Internal Medicine, Pulmonary and Critical Care Medicine, University of Kentucky, 740 S. Limestone, KY Clinic L543, Lexington, KY, 40536, USA.
| | - Melina Aguinaga Meza
- Department of Internal Medicine, Division of Cardiovascular Medicine - Gill Heart Institute, University of Kentucky, Lexington, KY, USA
| | - Ketan P Buch
- Department of Internal Medicine, Pulmonary and Critical Care Medicine, University of Kentucky, 740 S. Limestone, KY Clinic L543, Lexington, KY, 40536, USA
| | - Margaret A Disselkamp
- Department of Internal Medicine, Pulmonary and Critical Care Medicine, University of Kentucky, 740 S. Limestone, KY Clinic L543, Lexington, KY, 40536, USA
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22
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See KC, Ng J, Siow WT, Ong V, Phua J. Frequency and prognostic impact of basic critical care echocardiography abnormalities in patients with acute respiratory distress syndrome. Ann Intensive Care 2017; 7:120. [PMID: 29260440 PMCID: PMC5736519 DOI: 10.1186/s13613-017-0343-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Accepted: 12/13/2017] [Indexed: 02/08/2023] Open
Abstract
Background Among intensive care unit (ICU) patients with acute respiratory distress syndrome (ARDS), apart from acute cor pulmonale (ACP), the frequency and prognostic impact of basic critical care echocardiography (BCCE) abnormalities are not well defined.
Methods Observational study of patients with ARDS, admitted from September 2012 to May 2014, who underwent BCCE within 48 h of admission to a 20-bed medical ICU. We examined the association of two major BCCE-detected abnormalities (left ventricular ejection fraction < 40% and severe ACP) with ICU/hospital mortality and ICU/hospital length of stay. Multivariable models adjusted for age and illness severity. Results Of 234 patients with ARDS (age 62.3 ± 14.3 years; 88/37.6% female; APACHE II 26.8 ± 8.3; 26.5% ICU mortality; 32.1% hospital mortality), 94 (40.2%) had at least one major BCCE-detected abnormality. The more common major BCCE abnormality found was severe ACP (28.2%), followed by left ventricular ejection fraction < 40% (16.2%). On multivariate analysis, only severe ACP remained significantly associated with ICU/hospital mortality. Hospital mortality for mild, moderate and severe ARDS was 17.0, 27.9 and 50.0%, respectively (without severe ACP), and was 29.2, 48.3 and 53.8%, respectively (with severe ACP). Conclusions BCCE abnormalities were common, but only severe ACP had prognostic significance in ARDS, identifying patients who are at increased risk of ICU and hospital mortality. The presence of severe ACP appears to upstage ARDS severity by one level.
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Affiliation(s)
- Kay Choong See
- Division of Respiratory and Critical Care Medicine, University Medicine Cluster, National University Health System, 1E Kent Ridge Road, NUHS Tower Block Level 10, Singapore, 119228, Singapore. .,Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
| | - Jeffrey Ng
- Division of Respiratory and Critical Care Medicine, University Medicine Cluster, National University Health System, 1E Kent Ridge Road, NUHS Tower Block Level 10, Singapore, 119228, Singapore.,Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Wen Ting Siow
- Division of Respiratory and Critical Care Medicine, University Medicine Cluster, National University Health System, 1E Kent Ridge Road, NUHS Tower Block Level 10, Singapore, 119228, Singapore.,Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Venetia Ong
- Division of Respiratory and Critical Care Medicine, University Medicine Cluster, National University Health System, 1E Kent Ridge Road, NUHS Tower Block Level 10, Singapore, 119228, Singapore.,Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Jason Phua
- Division of Respiratory and Critical Care Medicine, University Medicine Cluster, National University Health System, 1E Kent Ridge Road, NUHS Tower Block Level 10, Singapore, 119228, Singapore.,Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
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23
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Radermacher P, Maggiore SM, Mercat A. FiftyYears ofResearch inARDS.Gas Exchange in Acute Respiratory Distress Syndrome. Am J Respir Crit Care Med 2017; 196:964-984. [DOI: 10.1164/rccm.201610-2156so] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Peter Radermacher
- Institute of Anaesthesiological Pathophysiology and Process Engineering, University Medical School, Ulm, Germany
| | - Salvatore Maurizio Maggiore
- Section of Anesthesia, Analgesia, Perioperative, and Intensive Care, Department of Medical, Oral, and Biotechnological Sciences, School of Medicine and Health Sciences, “SS. Annunziata” Hospital, “Gabriele d’Annunzio” University of Chieti-Pescara, Chieti, Italy; and
| | - Alain Mercat
- Department of Medical Intensive Care and Hyperbaric Medicine, Angers University Hospital, Angers, France
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24
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Sanfilippo F, Corredor C, Arcadipane A, Landesberg G, Vieillard-Baron A, Cecconi M, Fletcher N. Tissue Doppler assessment of diastolic function and relationship with mortality in critically ill septic patients: a systematic review and meta-analysis. Br J Anaesth 2017; 119:583-594. [DOI: 10.1093/bja/aex254] [Citation(s) in RCA: 92] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2023] Open
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25
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Cordioli RL, Costa ELV, Azevedo LCP, Gomes S, Amato MBP, Park M. Physiologic effects of alveolar recruitment and inspiratory pauses during moderately-high-frequency ventilation delivered by a conventional ventilator in a severe lung injury model. PLoS One 2017; 12:e0185769. [PMID: 28961282 PMCID: PMC5621701 DOI: 10.1371/journal.pone.0185769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 09/19/2017] [Indexed: 11/18/2022] Open
Abstract
Background and aims To investigate whether performing alveolar recruitment or adding inspiratory pauses could promote physiologic benefits (VT) during moderately-high-frequency positive pressure ventilation (MHFPPV) delivered by a conventional ventilator in a porcine model of severe acute respiratory distress syndrome (ARDS). Methods Prospective experimental laboratory study with eight pigs. Induction of acute lung injury with sequential pulmonary lavages and injurious ventilation was initially performed. Then, animals were ventilated on a conventional mechanical ventilator with a respiratory rate (RR) = 60 breaths/minute and PEEP titrated according to ARDS Network table. The first two steps consisted of a randomized order of inspiratory pauses of 10 and 30% of inspiratory time. In final step, we removed the inspiratory pause and titrated PEEP, after lung recruitment, with the aid of electrical impedance tomography. At each step, PaCO2 was allowed to stabilize between 57–63 mmHg for 30 minutes. Results The step with RR of 60 after lung recruitment had the highest PEEP when compared with all other steps (17 [16,19] vs 14 [10, 17]cmH2O), but had lower driving pressures (13 [13,11] vs 16 [14, 17]cmH2O), higher P/F ratios (212 [191,243] vs 141 [105, 184] mmHg), lower shunt (23 [20, 23] vs 32 [27, 49]%), lower dead space ventilation (10 [0, 15] vs 30 [20, 37]%), and a more homogeneous alveolar ventilation distribution. There were no detrimental effects in terms of lung mechanics, hemodynamics, or gas exchange. Neither the addition of inspiratory pauses or the alveolar recruitment maneuver followed by decremental PEEP titration resulted in further reductions in VT. Conclusions During MHFPPV set with RR of 60 bpm delivered by a conventional ventilator in severe ARDS swine model, neither the inspiratory pauses or PEEP titration after recruitment maneuver allowed reduction of VT significantly, however the last strategy decreased driving pressures and improved both shunt and dead space.
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Affiliation(s)
- Ricardo Luiz Cordioli
- Research and Education Institute, Hospital Sírio-Libanês, São Paulo, Brazil
- Cardio-Pulmonary Department, Pulmonary Division, Heart Institute (Incor), University of São Paulo, São Paulo, Brazil
- Intensive Care Unit, Hospital Israelita Albert Einstein, São Paulo, Brazil
- Intensive Care Unit, Hospital Alemão Oswaldo Cruz, São Paulo, Brazil
- * E-mail:
| | - Eduardo Leite Vieira Costa
- Research and Education Institute, Hospital Sírio-Libanês, São Paulo, Brazil
- Cardio-Pulmonary Department, Pulmonary Division, Heart Institute (Incor), University of São Paulo, São Paulo, Brazil
| | - Luciano Cesar Pontes Azevedo
- Research and Education Institute, Hospital Sírio-Libanês, São Paulo, Brazil
- Emergency Medicine Discipline, Universidade de São Paulo, São Paulo, Brazil
| | - Susimeire Gomes
- Cardio-Pulmonary Department, Pulmonary Division, Heart Institute (Incor), University of São Paulo, São Paulo, Brazil
| | - Marcelo Britto Passos Amato
- Cardio-Pulmonary Department, Pulmonary Division, Heart Institute (Incor), University of São Paulo, São Paulo, Brazil
| | - Marcelo Park
- Research and Education Institute, Hospital Sírio-Libanês, São Paulo, Brazil
- Emergency Medicine Discipline, Universidade de São Paulo, São Paulo, Brazil
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26
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Meade MO, Young D, Hanna S, Zhou Q, Bachman TE, Bollen C, Slutsky AS, Lamb SE, Adhikari NKJ, Mentzelopoulos SD, Cook DJ, Sud S, Brower RG, Thompson BT, Shah S, Stenzler A, Guyatt G, Ferguson ND. Severity of Hypoxemia and Effect of High-Frequency Oscillatory Ventilation in Acute Respiratory Distress Syndrome. Am J Respir Crit Care Med 2017; 196:727-733. [PMID: 28245137 DOI: 10.1164/rccm.201609-1938oc] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE High-frequency oscillatory ventilation (HFOV) is theoretically beneficial for lung protection, but the results of clinical trials are inconsistent, with study-level meta-analyses suggesting no significant effect on mortality. OBJECTIVES The aim of this individual patient data meta-analysis was to identify acute respiratory distress syndrome (ARDS) patient subgroups with differential outcomes from HFOV. METHODS After a comprehensive search for trials, two reviewers independently identified randomized trials comparing HFOV with conventional ventilation for adults with ARDS. Prespecified effect modifiers were tested using multivariable hierarchical logistic regression models, adjusting for important prognostic factors and clustering effects. MEASUREMENTS AND MAIN RESULTS Data from 1,552 patients in four trials were analyzed, applying uniform definitions for study variables and outcomes. Patients had a mean baseline PaO2/FiO2 of 114 ± 39 mm Hg; 40% had severe ARDS (PaO2/FiO2 <100 mm Hg). Mortality at 30 days was 321 of 785 (40.9%) for HFOV patients versus 288 of 767 (37.6%) for control subjects (adjusted odds ratio, 1.17; 95% confidence interval, 0.94-1.46; P = 0.16). This treatment effect varied, however, depending on baseline severity of hypoxemia (P = 0.0003), with harm increasing with PaO2/FiO2 among patients with mild-moderate ARDS, and the possibility of decreased mortality in patients with very severe ARDS. Compliance and body mass index did not modify the treatment effect. HFOV increased barotrauma risk compared with conventional ventilation (adjusted odds ratio, 1.75; 95% confidence interval, 1.04-2.96; P = 0.04). CONCLUSIONS HFOV increases mortality for most patients with ARDS but may improve survival among patients with severe hypoxemia on conventional mechanical ventilation.
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Affiliation(s)
- Maureen O Meade
- 1 Department of Medicine and.,2 Department of Clinical Epidemiology & Biostatistics, McMaster University, Hamilton, Ontario, Canada
| | | | - Steven Hanna
- 1 Department of Medicine and.,2 Department of Clinical Epidemiology & Biostatistics, McMaster University, Hamilton, Ontario, Canada
| | - Qi Zhou
- 1 Department of Medicine and.,2 Department of Clinical Epidemiology & Biostatistics, McMaster University, Hamilton, Ontario, Canada
| | | | - Casper Bollen
- 5 Wilhelmina Children's Hospital, Utrecht, the Netherlands
| | - Arthur S Slutsky
- 6 Interdepartmental Division of Critical Care Medicine.,8 Department of Medicine, and.,7 Keenan Centre for Biomedical Research, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Canada
| | | | - Neill K J Adhikari
- 6 Interdepartmental Division of Critical Care Medicine.,8 Department of Medicine, and.,9 Department of Critical Care Medicine, Sunnybrook Health Science Centre, Toronto, Canada
| | | | - Deborah J Cook
- 1 Department of Medicine and.,2 Department of Clinical Epidemiology & Biostatistics, McMaster University, Hamilton, Ontario, Canada
| | - Sachin Sud
- 11 Trillium Health Partners, University of Toronto, Mississauga, Ontario, Canada
| | - Roy G Brower
- 12 Johns Hopkins University School of Medicine, Baltimore, Maryland
| | | | - Sanjoy Shah
- 14 University Hospitals Bristol, National Health Service Foundation Trust, Bristol, United Kingdom
| | - Alex Stenzler
- 15 12th Man Technologies, Garden Grove, California; and
| | - Gordon Guyatt
- 1 Department of Medicine and.,2 Department of Clinical Epidemiology & Biostatistics, McMaster University, Hamilton, Ontario, Canada
| | - Niall D Ferguson
- 6 Interdepartmental Division of Critical Care Medicine.,8 Department of Medicine, and.,16 Institute for Health Policy, Management, and Evaluation, University of Toronto, Toronto, Canada.,17 Division of Respirology, Department of Medicine, University Health Network and Mount Sinai Hospital, Toronto General Research Institute, Toronto, Canada
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27
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Sklar MC, Fan E, Goligher EC. High-Frequency Oscillatory Ventilation in Adults With ARDS: Past, Present, and Future. Chest 2017; 152:1306-1317. [PMID: 28684287 DOI: 10.1016/j.chest.2017.06.025] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 05/29/2017] [Accepted: 06/16/2017] [Indexed: 01/12/2023] Open
Abstract
High-frequency oscillatory ventilation (HFOV) is a unique mode of mechanical ventilation that uses nonconventional gas exchange mechanisms to deliver ventilation at very low tidal volumes and high frequencies. The properties of HFOV make it a potentially ideal mode to prevent ventilator-induced lung injury in patients with ARDS. Despite a compelling physiological basis and promising experimental data, large randomized controlled trials have not detected an improvement in survival with the use of HFOV, and its use as an early lung-protective strategy in patients with ARDS may be harmful. Nevertheless, HFOV still has an important potential role in the management of refractory hypoxemia. Careful attention should be paid to right ventricular function and lung stress when applying HFOV. This review discusses the physiological principles, clinical evidence, practical applications, and future prospects for the use of HFOV in patients with ARDS.
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Affiliation(s)
- Michael C Sklar
- Department of Anesthesia, University of Toronto, Toronto, ON, Canada; Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, ON, Canada
| | - Eddy Fan
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, ON, Canada; Institute for Health Policy, Management, and Evaluation, University of Toronto, Toronto, ON, Canada; Division of Respirology, Department of Medicine, University Health Network and Mount Sinai Hospital, Toronto, ON, Canada
| | - Ewan C Goligher
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, ON, Canada; Division of Respirology, Department of Medicine, University Health Network and Mount Sinai Hospital, Toronto, ON, Canada.
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28
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Das SK, Choupoo NS, Saikia P, Lahkar A. Incidence Proportion of Acute Cor Pulmonale in Patients with Acute Respiratory Distress Syndrome Subjected to Lung Protective Ventilation: A Systematic Review and Meta-analysis. Indian J Crit Care Med 2017; 21:364-375. [PMID: 28701843 PMCID: PMC5492739 DOI: 10.4103/ijccm.ijccm_155_17] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
INTRODUCTION Reported incidence of acute cor pulmonale (ACP) in patients with acute respiratory distress syndrome (ARDS) varies from 10% to 84%, despite being subjected to lung protective ventilation according to the current guidelines. The objective of this review is to find pooled cumulative incidence of ACP in patients with ARDS undergoing lung protective ventilation. MATERIALS AND METHODS We searched MEDLINE, EMBASE, Cochrane Library, KoreaMed, LILACS, and WHO Clinical Trial Registry. Cross-sectional or cohort studies were included if they reported or provided data that could be used to calculate the incidence proportion of ACP. Inverse variance heterogeneity (IVhet) and random effect model were used for the main outcome and measures. RESULTS We included 16 studies encompassing 1661 patients. The cumulative incidence of ACP using IVhet analysis was 23% (95% confidence interval [CI] = 18%-28%) over 3 days of lung protective ventilation. Random effect analysis of 7 studies (1250 patients) revealed pooled odd ratio of mortality of 1.16 (95% CI = 0.80-1.67, P = 0.44) due to ACP. CONCLUSION Patients with ARDS have a 23% risk of developing ACP with lung protective ventilation. Findings of this review indicate the need of updating existing guidelines for ventilating ARDS patients to incorporate right ventricle protective strategy.
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Affiliation(s)
- Saurabh Kumar Das
- Department of Critical Care, Fortis Super Specialty Hospital, Shalimar Bagh, New Delhi, India
| | - Nang Sujali Choupoo
- Department of Anesthesiology and Critical Care, Post graduate Institute of Medical Education and Research - Dr. Ram Monohar Lohia Hospital, New Delhi, India
| | - Priyam Saikia
- Department of Anesthesia, Milton Keynes Hospital, NHS Foundation Trust, Standing Way, Eaglestone, Milton Keynes, MK6 5HS, UK
| | - Amitabh Lahkar
- Department of Anaesthesiology and Critical Care, Gauhati Medical College and Hospital, Guwahati, Assam, India
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29
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Voiriot G, Razazi K, Amsellem V, Tran Van Nhieu J, Abid S, Adnot S, Mekontso Dessap A, Maitre B. Interleukin-6 displays lung anti-inflammatory properties and exerts protective hemodynamic effects in a double-hit murine acute lung injury. Respir Res 2017; 18:64. [PMID: 28424078 PMCID: PMC5397701 DOI: 10.1186/s12931-017-0553-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 04/13/2017] [Indexed: 01/11/2023] Open
Abstract
Background Interleukin 6 (IL-6) is a predictive factor of poor prognosis in patients with acute respiratory distress syndrome (ARDS). However, its acute pulmonary hemodynamic effects and role in lung injury have not been investigated in a clinically relevant murine model of ARDS. Methods We used adult C57Bl6 wild-type (WT) and IL-6 knock-out (IL-6KO) mice. The animals received intravenous recombinant human IL-6 (rHuIL-6) or vehicle followed by intratracheal lipopolysaccharide (LPS) or saline before undergoing low tidal volume mechanical ventilation (MV) for 5 h. Before sacrifice, right ventricular systolic pressure and cardiac output were measured and total pulmonary resistance was calculated. After sacrifice, lung inflammation, edema and injury were assessed with bronchoalveolar lavage (BAL) and histology. In other experiments, right ventricular systolic pressure was recorded during hypoxic challenges in uninjured WT mice pretreated with rHuIL-6 or rHuIL-6 + non-selective nitric oxide synthase inhibitor L-NAME or vehicle. Results IL-6KO(LPS+MV) mice showed a faster deterioration of lung elastic properties and more severe bronchoalveolar cellular inflammation as compared to WT(LPS+MV). Treatment with rHuIL-6 partially prevented this lung deterioration. Total pulmonary resistance was higher in IL-6KO(LPS+MV) mice and this increase was abolished in rHuIL-6-treated IL-6KO mice. Finally, rHuIL-6 reduced hypoxic pulmonary vasoconstriction in uninjured WT mice, an effect that was abolished by co-treatment with L-NAME. Conclusions In a double-hit murine model of ARDS, IL-6 deficient mice experienced more severe bronchoalveolar cellular inflammation as compared to wild-type littermates. Furthermore, IL-6 deficiency caused marked acute pulmonary hypertension, which may be, at least partially, due to vasoactive mechanisms. A dysregulation of nitric oxide synthase may account for this observation, a hypothesis that will need to be investigated in future studies.
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Affiliation(s)
- Guillaume Voiriot
- INSERM, Unité U955 (Institut Mondor de Recherche Biomédicale), Créteil, France. .,Faculté de Médecine, Groupe de recherche clinique CARMAS, Université Paris Est, Créteil, France.
| | - Keyvan Razazi
- INSERM, Unité U955 (Institut Mondor de Recherche Biomédicale), Créteil, France.,Faculté de Médecine, Groupe de recherche clinique CARMAS, Université Paris Est, Créteil, France.,Groupe Henri Mondor-Albert Chenevier, Hôpital Henri Mondor, Service de Réanimation Médicale, AP-HP, Créteil, France
| | - Valérie Amsellem
- INSERM, Unité U955 (Institut Mondor de Recherche Biomédicale), Créteil, France
| | - Jeanne Tran Van Nhieu
- Faculté de Médecine, Groupe de recherche clinique CARMAS, Université Paris Est, Créteil, France.,Groupe Henri Mondor-Albert Chenevier, Hôpital Henri Mondor, Service d'Anatomie et Cytologie Pathologiques, AP-HP, Créteil, France
| | - Shariq Abid
- INSERM, Unité U955 (Institut Mondor de Recherche Biomédicale), Créteil, France
| | - Serge Adnot
- INSERM, Unité U955 (Institut Mondor de Recherche Biomédicale), Créteil, France.,Faculté de Médecine, Groupe de recherche clinique CARMAS, Université Paris Est, Créteil, France.,Groupe Henri Mondor-Albert Chenevier, Hôpital Henri Mondor, Service des Explorations Fonctionnelles, AP-HP, Créteil, France
| | - Armand Mekontso Dessap
- INSERM, Unité U955 (Institut Mondor de Recherche Biomédicale), Créteil, France.,Faculté de Médecine, Groupe de recherche clinique CARMAS, Université Paris Est, Créteil, France.,Groupe Henri Mondor-Albert Chenevier, Hôpital Henri Mondor, Service de Réanimation Médicale, AP-HP, Créteil, France
| | - Bernard Maitre
- INSERM, Unité U955 (Institut Mondor de Recherche Biomédicale), Créteil, France.,Faculté de Médecine, Groupe de recherche clinique CARMAS, Université Paris Est, Créteil, France.,Groupe Henri Mondor-Albert Chenevier, Hôpital Henri Mondor, Service de Réanimation Médicale, AP-HP, Créteil, France
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30
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Zochios V, Parhar K, Tunnicliffe W, Roscoe A, Gao F. The Right Ventricle in ARDS. Chest 2017; 152:181-193. [PMID: 28267435 DOI: 10.1016/j.chest.2017.02.019] [Citation(s) in RCA: 135] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 02/15/2017] [Accepted: 02/17/2017] [Indexed: 02/08/2023] Open
Abstract
ARDS is associated with poor clinical outcomes, with a pooled mortality rate of approximately 40% despite best standards of care. Current therapeutic strategies are based on improving oxygenation and pulmonary compliance while minimizing ventilator-induced lung injury. It has been demonstrated that relative hypoxemia can be well tolerated, and improvements in oxygenation do not necessarily translate into survival benefit. Cardiac failure, in particular right ventricular dysfunction (RVD), is commonly encountered in moderate to severe ARDS and is reported to be one of the major determinants of mortality. The prevalence rate of echocardiographically evident RVD in ARDS varies across studies, ranging from 22% to 50%. Although there is no definitive causal relationship between RVD and mortality, severe RVD is associated with increased mortality. Factors that can adversely affect RV function include hypoxic pulmonary vasoconstriction, hypercapnia, and invasive ventilation with high driving pressure. It might be expected that early diagnosis of RVD would be of benefit; however, echocardiographic markers (qualitative and quantitative) used to prospectively evaluate the right ventricle in ARDS have not been tested in adequately powered studies. In this review, we examine the prognostic implications and pathophysiology of RVD in ARDS and discuss available diagnostic modalities and treatment options. We aim to identify gaps in knowledge and directions for future research that could potentially improve clinical outcomes in this patient population.
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Affiliation(s)
- Vasileios Zochios
- Department of Critical Care Medicine, University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital, Edgbaston; Institute of Inflammation and Ageing, Centre of Translational Inflammation Research, University of Birmingham, Birmingham.
| | - Ken Parhar
- Department of Critical Care Medicine, the University of Calgary, Calgary, AB, Canada
| | - William Tunnicliffe
- Department of Critical Care Medicine, University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital, Edgbaston
| | - Andrew Roscoe
- Department of Cardiothoracic Anesthesia and Critical Care Medicine, Papworth Hospital NHS Foundation Trust, Papworth Everard, Cambridge
| | - Fang Gao
- Institute of Inflammation and Ageing, Centre of Translational Inflammation Research, University of Birmingham, Birmingham; Academic Department of Anesthesia, Critical Care, Pain and Resuscitation, Heart of England NHS Foundation Trust, Birmingham, England, and The 2nd Affiliated Hospital and Yuying Children's Hospital Wenzhou Medical University, Wenzhou, China
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31
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32
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Cho YJ, Moon JY, Shin ES, Kim JH, Jung H, Park SY, Kim HC, Sim YS, Rhee CK, Lim J, Lee SJ, Lee WY, Lee HJ, Kwak SH, Kang EK, Chung KS, Choi WI. Clinical Practice Guideline of Acute Respiratory Distress Syndrome. Tuberc Respir Dis (Seoul) 2016; 79:214-233. [PMID: 27790273 PMCID: PMC5077725 DOI: 10.4046/trd.2016.79.4.214] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 06/27/2016] [Accepted: 08/16/2016] [Indexed: 12/29/2022] Open
Abstract
There is no well-stated practical guideline for mechanically ventilated patients with or without acute respiratory distress syndrome (ARDS). We generate strong (1) and weak (2) grade of recommendations based on high (A), moderate (B) and low (C) grade in the quality of evidence. In patients with ARDS, we recommend low tidal volume ventilation (1A) and prone position if it is not contraindicated (1B) to reduce their mortality. However, we did not support high-frequency oscillatory ventilation (1B) and inhaled nitric oxide (1A) as a standard treatment. We also suggest high positive end-expiratory pressure (2B), extracorporeal membrane oxygenation as a rescue therapy (2C), and neuromuscular blockage for 48 hours after starting mechanical ventilation (2B). The application of recruitment maneuver may reduce mortality (2B), however, the use of systemic steroids cannot reduce mortality (2B). In mechanically ventilated patients, we recommend light sedation (1B) and low tidal volume even without ARDS (1B) and suggest lung protective ventilation strategy during the operation to lower the incidence of lung complications including ARDS (2B). Early tracheostomy in mechanically ventilated patients can be performed only in limited patients (2A). In conclusion, of 12 recommendations, nine were in the management of ARDS, and three for mechanically ventilated patients.
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Affiliation(s)
- Young-Jae Cho
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Jae Young Moon
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea
| | - Ein-Soon Shin
- Research Agency for Clinical Practice Guidelines, Korean Academy of Medical Sciences Research Center, Seoul, Korea
| | - Je Hyeong Kim
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea
| | - Hoon Jung
- Department of Pulmonary and Critical Care Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea
| | - So Young Park
- Department of Pulmonary and Critical Care Medicine, Kyung Hee University Medical Center, Seoul, Korea
| | - Ho Cheol Kim
- Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Gyeongsang National University School of Medicine, Changwon, Korea
| | - Yun Su Sim
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea
| | - Chin Kook Rhee
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Jaemin Lim
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea
| | - Seok Jeong Lee
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Won-Yeon Lee
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Hyun Jeong Lee
- Department of Anesthesiology and Pain Medicine, Chonnam National University Medical School, Gwangju, Korea
| | - Sang Hyun Kwak
- Department of Anesthesiology and Pain Medicine, Chonnam National University Medical School, Gwangju, Korea
| | - Eun Kyeong Kang
- Department of Pediatrics, Dongguk University Ilsan Hospital, Goyang, Korea
| | - Kyung Soo Chung
- Division of Pulmonology, Department of Internal Medicine, Severance Hospital, Institute of Chest Diseases, Yonsei University College of Medicine, Seoul, Korea
| | - Won-Il Choi
- Department of Internal Medicine, Keimyung University Dongsan Hospital, Daegu, Korea
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Abstract
PURPOSE OF REVIEW Circulatory failure is a frequent complication during acute respiratory distress syndrome (ARDS) and is associated with a poor outcome. This review aims at clarifying the mechanisms of circulatory failure during ARDS. RECENT FINDINGS For the past decades, the right ventricle (RV) has gained a crucial interest since many authors confirmed the high incidence of acute cor pulmonale during ARDS and showed a potential role of the acute cor pulmonale in the poor outcome of ARDS patients. The most important recent progress demonstrated in ARDS ventilatory strategy is represented by the prone position, which has a huge beneficial effect on RV afterload. This review will focus on the mechanisms responsible for the RV dysfunction/failure during ARDS and on the strategy, which allows improving the right ventricular function. SUMMARY The RV has a pivotal role in the circulatory failure of ARDS patients. The ventilatory strategy during ARDS has to pay a peculiar attention to the RV to rigorously control its afterload.
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Guervilly C, Forel JM, Hraiech S, Roch A, Talmor D, Papazian L. Effect of high-frequency oscillatory ventilation on esophageal and transpulmonary pressures in moderate-to-severe acute respiratory distress syndrome. Ann Intensive Care 2016; 6:84. [PMID: 27577052 PMCID: PMC5005229 DOI: 10.1186/s13613-016-0181-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 08/10/2016] [Indexed: 12/02/2022] Open
Abstract
Background High-frequency oscillatory ventilation (HFOV) has not been shown to be beneficial in the management of moderate-to-severe acute respiratory distress syndrome (ARDS). There is uncertainty about the actual pressure applied into the lung during HFOV. We therefore performed a study to compare the transpulmonary pressure (PL) during conventional mechanical ventilation (CMV) and different levels of mean airway pressure (mPaw) during HFOV. Methods This is a prospective randomized crossover study in a university teaching hospital. An esophageal balloon catheter was used to measure esophageal pressures (Pes) at end inspiration and end expiration and to calculate PL. Measurements were taken during ventilation with CMV (CMVpre) after which patients were switched to HFOV with three 1-h different levels of mPaw set at +5, +10 and +15 cm H2O above the mean airway pressure measured during CMV. Patients were thereafter switched back to CMV (CMVpost). Results Ten patients with moderate-to-severe ARDS were included. We demonstrated a linear increase in Pes and PL with the increase in mPaw during HFOV. Contrary to CMV, PL was always positive during HFOV whatever the level of mPaw applied but not associated with improvement in oxygenation. We found significant correlations between mPaw and Pes. Conclusion HFOV with high level of mPaw increases transpulmonary pressures without improvement in oxygenation.
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Affiliation(s)
- Christophe Guervilly
- Aix-Marseille Univ, APHM, URMITE UMR CNRS 7278, Hôpital Nord, Réanimation des Détresses Respiratoires et Infections Sévères, Marseille, France.
| | - Jean-Marie Forel
- Aix-Marseille Univ, APHM, URMITE UMR CNRS 7278, Hôpital Nord, Réanimation des Détresses Respiratoires et Infections Sévères, Marseille, France
| | - Sami Hraiech
- Aix-Marseille Univ, APHM, URMITE UMR CNRS 7278, Hôpital Nord, Réanimation des Détresses Respiratoires et Infections Sévères, Marseille, France
| | - Antoine Roch
- Aix-Marseille Univ, APHM, URMITE UMR CNRS 7278, Hôpital Nord, Réanimation des Détresses Respiratoires et Infections Sévères, Marseille, France.,Service d'Accueil des Urgences, APHM, Hôpital Nord, Marseille, France
| | - Daniel Talmor
- Department of Anesthesia, Critical Care, and Pain Medicine, Beth Israel Deaconess Medical Center, 330 Brookline Ave, Boston, MA, USA
| | - Laurent Papazian
- Aix-Marseille Univ, APHM, URMITE UMR CNRS 7278, Hôpital Nord, Réanimation des Détresses Respiratoires et Infections Sévères, Marseille, France
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Adhikari NKJ, Slutsky AS. Pediatric High-Frequency Oscillation. The End of the Road? Am J Respir Crit Care Med 2016; 193:471-2. [PMID: 26930425 DOI: 10.1164/rccm.201511-2169ed] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Neill K J Adhikari
- 1 Department of Critical Care Medicine Sunnybrook Health Sciences Centre Toronto, Canada.,2 Interdepartmental Division of Critical Care University of Toronto Toronto, Canada and
| | - Arthur S Slutsky
- 2 Interdepartmental Division of Critical Care University of Toronto Toronto, Canada and.,3 Keenan Research Centre for Biomedical Science Li Ka Shing Knowledge Institute of St. Michael's Hospital Toronto, Canada
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Kobylianskii J, Murray A, Brace D, Goligher E, Fan E. Electrical impedance tomography in adult patients undergoing mechanical ventilation: A systematic review. J Crit Care 2016; 35:33-50. [PMID: 27481734 DOI: 10.1016/j.jcrc.2016.04.028] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 04/25/2016] [Accepted: 04/27/2016] [Indexed: 01/20/2023]
Abstract
PURPOSE The purpose of the study is to systematically review and summarize current literature concerning the validation and application of electrical impedance tomography (EIT) in mechanically ventilated adult patients. MATERIALS AND METHODS An electronic search of MEDLINE, EMBASE, CINAHL, Cochrane Central Register of Controlled Trials, and the Web of Science was performed up to June 2014. Studies investigating the use of EIT in an adult human patient population treated with mechanical ventilation (MV) were included. Data extracted included study objectives, EIT details, interventions, MV protocol, validation and comparators, population characteristics, and key findings. RESULTS Of the 67 included studies, 35 had the primary objective of validating EIT measures including regional ventilation distribution, lung volume, regional respiratory mechanics, and nonventilatory parameters. Thirty-two studies had the primary objective of applying EIT to monitor the response to therapeutic MV interventions including change in ventilation mode, patient repositioning, endotracheal suctioning, recruitment maneuvers, and change in positive end-expiratory pressure. CONCLUSIONS In adult patients, EIT has been successfully validated for assessing ventilation distribution, measuring changes in lung volume, studying regional respiratory mechanics, and investigating nonventilatory parameters. Electrical impedance tomography has also been demonstrated to be useful in monitoring regional respiratory system changes during MV interventions, although existing literature lacks clinical outcome evidence.
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Affiliation(s)
- Jane Kobylianskii
- School of Medicine, Queen's University, Kingston, Canada; Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
| | - Alistair Murray
- Schulich School of Medicine & Dentistry, Western University, London, Canada; Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
| | - Debbie Brace
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
| | - Ewan Goligher
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
| | - Eddy Fan
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada.
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Vieillard-Baron A, Matthay M, Teboul JL, Bein T, Schultz M, Magder S, Marini JJ. Experts' opinion on management of hemodynamics in ARDS patients: focus on the effects of mechanical ventilation. Intensive Care Med 2016; 42:739-749. [PMID: 27038480 DOI: 10.1007/s00134-016-4326-3] [Citation(s) in RCA: 173] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 03/11/2016] [Indexed: 02/06/2023]
Abstract
RATIONALE Acute respiratory distress syndrome (ARDS) is frequently associated with hemodynamic instability which appears as the main factor associated with mortality. Shock is driven by pulmonary hypertension, deleterious effects of mechanical ventilation (MV) on right ventricular (RV) function, and associated-sepsis. Hemodynamic effects of ventilation are due to changes in pleural pressure (Ppl) and changes in transpulmonary pressure (TP). TP affects RV afterload, whereas changes in Ppl affect venous return. Tidal forces and positive end-expiratory pressure (PEEP) increase pulmonary vascular resistance (PVR) in direct proportion to their effects on mean airway pressure (mPaw). The acutely injured lung has a reduced capacity to accommodate flowing blood and increases of blood flow accentuate fluid filtration. The dynamics of vascular pressure may contribute to ventilator-induced injury (VILI). In order to optimize perfusion, improve gas exchange, and minimize VILI risk, monitoring hemodynamics is important. RESULTS During passive ventilation pulse pressure variations are a predictor of fluid responsiveness when conditions to ensure its validity are observed, but may also reflect afterload effects of MV. Central venous pressure can be helpful to monitor the response of RV function to treatment. Echocardiography is suitable to visualize the RV and to detect acute cor pulmonale (ACP), which occurs in 20-25 % of cases. Inserting a pulmonary artery catheter may be useful to measure/calculate pulmonary artery pressure, pulmonary and systemic vascular resistance, and cardiac output. These last two indexes may be misleading, however, in cases of West zones 2 or 1 and tricuspid regurgitation associated with RV dilatation. Transpulmonary thermodilution may be useful to evaluate extravascular lung water and the pulmonary vascular permeability index. To ensure adequate intravascular volume is the first goal of hemodynamic support in patients with shock. The benefit and risk balance of fluid expansion has to be carefully evaluated since it may improve systemic perfusion but also may decrease ventilator-free days, increase pulmonary edema, and promote RV failure. ACP can be prevented or treated by applying RV protective MV (low driving pressure, limited hypercapnia, PEEP adapted to lung recruitability) and by prone positioning. In cases of shock that do not respond to intravascular fluid administration, norepinephrine infusion and vasodilators inhalation may improve RV function. Extracorporeal membrane oxygenation (ECMO) has the potential to be the cause of, as well as a remedy for, hemodynamic problems. Continuous thermodilution-based and pulse contour analysis-based cardiac output monitoring are not recommended in patients treated with ECMO, since the results are frequently inaccurate. Extracorporeal CO2 removal, which could have the capability to reduce hypercapnia/acidosis-induced ACP, cannot currently be recommended because of the lack of sufficient data.
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Affiliation(s)
- A Vieillard-Baron
- Intensive Care Unit, Section Thorax-Vascular Disease-Abdomen-Metabolism, Service de Réanimation, Assistance Publique-Hôpitaux de Paris, University Hospital Ambroise Paré, 9, avenue Charles de Gaulle, 92100, Boulogne-Billancourt, France. .,University of Versailles Saint-Quentin en Yvelines, Faculty of Medicine Paris Ile-de-France Ouest, 78280, Saint-Quentin en Yvelines, France. .,INSERM U-1018, CESP, Team 5 (EpReC, Renal and Cardiovascular Epidemiology), UVSQ, 94807, Villejuif, France.
| | - M Matthay
- Departments of Medicine and Anesthesia and the Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA
| | - J L Teboul
- Assistance Publique-Hôpitaux de Paris, Hôpitaux universitaires Paris-Sud, Hôpital de Bicêtre, service de réanimation médicale, Le Kremlin-Bicêtre, France.,Université Paris-Sud, Faculté de médecine Paris-Sud, Inserm UMR S_999, Le Kremlin-Bicêtre, France
| | - T Bein
- Department of Anesthesia, Operative Intensive Care, University Hospital Regensburg, 93042, Regensburg, Germany
| | - M Schultz
- Laboratory of Experimental Intensive Care and Anesthesiology, Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
| | - S Magder
- Department of Critical Care, McGill University Health Centre (Glen Site Campus), Montreal, Canada
| | - J J Marini
- Departments of Pulmonary and Critical Care Medicine, University of Minnesota and Regions Hospital, Minneapolis/St. Paul, MN, USA
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Cho YJ, Moon JY, Shin ES, Kim JH, Jung H, Park SY, Kim HC, Sim YS, Rhee CK, Lim J, Lee SJ, Lee WY, Lee HJ, Kwak SH, Kang EK, Chung KS, Choi WI. Clinical Practice Guideline of Acute Respiratory Distress Syndrome. Korean J Crit Care Med 2016. [DOI: 10.4266/kjccm.2016.31.2.76] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- Young-Jae Cho
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Jae Young Moon
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea
| | - Ein-Soon Shin
- Research Agency for Clinical Practice Guidelines, Korean Academy of Medical Sciences Research Center, Seoul, Korea
| | - Je Hyeong Kim
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Ansan, Korea University College of Medicine, Korea
| | - Hoon Jung
- Department of Pulmonary and Critical Care Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea
| | - So Young Park
- Department of Pulmonary and Critical Care Medicine, Kyung Hee University Medical Center, Seoul, Korea
| | - Ho Cheol Kim
- Department of Internal Medicine, Gyeongsang National University School of Medicine and Gyeongsang National University Changwon Hospital, Changwon, Korea
| | - Yun Su Sim
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea
| | - Chin Kook Rhee
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Seoul St. Mary's Hospital, Catholic University of Korea, Seoul, Korea
| | - Jaemin Lim
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Gangneung Asan Hospital, University of Ulsan Medical College of Medicine, Gangneung, Korea
| | - Seok Jeong Lee
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Won-Yeon Lee
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Hyun Jeong Lee
- Department of Anesthesiology and Pain Medicine, Chonnam National University Medical School and Hospital, Gwangju, Korea
| | - Sang Hyun Kwak
- Department of Anesthesiology and Pain Medicine, Chonnam National University Medical School and Hospital, Gwangju, Korea
| | - Eun Kyeong Kang
- Department of Pediatrics, Dongguk University Ilsan Hospital, Goyang, Korea
| | - Kyung Soo Chung
- Division of Pulmonology, Department of Internal Medicine, Severance Hospital, Institute of Chest Diseases, Yonsei University College of Medicine, Seoul, Korea
| | - Won-Il Choi
- Department of Internal Medicine, Keimyung University Dongsan Hospital, Daegu, Korea
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Takeuchi M, Tachibana K. Mechanical ventilation for ARDS patients--for a better understanding of the 2012 Surviving Sepsis Campaign Guidelines. Cardiovasc Hematol Disord Drug Targets 2015; 15:41-5. [PMID: 25567337 PMCID: PMC4428140 DOI: 10.2174/1871529x15666150108113853] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 09/20/2014] [Accepted: 10/10/2014] [Indexed: 12/29/2022]
Abstract
The mortality rate among patients suffering acute respiratory distress syndrome (ARDS) remains high despite implementation at clinical centers of the lung protective ventilatory strategies recommended by the International Guidelines for Management of Severe Sepsis and Septic Shock, 2012. This suggests that such strategies are still sub-optimal for some ARDS patients. For these patients, tailored use of ventilator settings should be considered, including: further reduction of tidal volumes, administration of neuromuscular blocking agents if the patient’s spontaneous breathing is incompatible with mechanical ventilation, and adjusting positive end-expiratory pressure (PEEP) settings based on transpulmonary pressure levels.
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Affiliation(s)
| | - Kazuya Tachibana
- Department of Intensive Care Medicine, Osaka Medical Center and Research Institute for Maternal and Child Health, 840 Murodocho, Izumi, Osaka, 594-1101, Japan.
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40
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Gong B, Krueger-Ziolek S, Moeller K, Schullcke B, Zhao Z. Electrical impedance tomography: functional lung imaging on its way to clinical practice? Expert Rev Respir Med 2015; 9:721-37. [DOI: 10.1586/17476348.2015.1103650] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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41
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Electrical impedance tomography-guided prone positioning in a patient with acute cor pulmonale associated with severe acute respiratory distress syndrome. J Anesth 2015; 30:161-5. [PMID: 26446805 PMCID: PMC4744250 DOI: 10.1007/s00540-015-2084-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Accepted: 09/20/2015] [Indexed: 01/12/2023]
Abstract
Electrical impedance tomography (EIT) is a noninvasive technique used to assess regional gas distribution in the lung. We experienced a patient with acute cor pulmonale during high positive-pressure ventilation for the treatment of severe acute respiratory distress syndrome. Prone positioning was beneficial for unloading the right ventricle for treatment of acute cor pulmonale. EIT played a role in detecting lung derecruitment at the patient’s bedside. Impedance distribution in ventral, mid-ventral, mid-dorsal, and dorsal layers before and 20 min after the start of prone positioning was 9, 48, 44, and 0 %, and 10, 25, 48, and 16 %, respectively. Lung recruitment monitored by EIT paralleled the improvement of PaO2/FIO2 from 123 to 239 mmHg. Timing of termination of prone positioning and ventilator settings such as lowering positive end-expiration pressure was determined to maintain dorsal recruitment as seen by EIT. The patient was weaned from mechanical ventilation on day 32 and discharged on day 200. EIT assessed the effects of prone positioning with real-time dynamic imaging and guided less injurious mechanical ventilation in a patient with acute cor pulmonale with dorsal lung derecruitment.
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Dreyfuss D, Ricard JD, Gaudry S. Did studies on HFOV fail to improve ARDS survival because they did not decrease VILI? On the potential validity of a physiological concept enounced several decades ago. Intensive Care Med 2015; 41:2076-86. [PMID: 26438222 DOI: 10.1007/s00134-015-4062-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 09/06/2015] [Indexed: 02/06/2023]
Abstract
High frequency oscillatory ventilation (HFOV) has been the subject of extensive physiological research for 30 years and even more so of an intense debate on its potential usefulness in the treatment of acute respiratory distress syndrome (ARDS). This technique has been enthusiastically promoted by some teams until two high-quality randomized clinical trials in adults with ARDS showed that HFOV did not decrease and might have even increased mortality. As a consequence of these results, physiological concepts such as atelectrauma and biotrauma on which ARDS management with HFOV were based should be reexamined. In contrast, the concept of volutrauma, i.e., end-inspiratory overdistension, as the cause for ventilator-induced lung injury might help explain excess mortality during mechanical ventilation of ARDS when inspiratory volumes are too high. This is what might have happened during one of the recent studies on HFOV. Failure of this complex technique must be put in perspective with the dramatic improvement of ARDS prognosis with very simple interventions such as tidal volume reduction, early pharmacological paralysis, and prone positioning which all limited end-inspiratory volume.
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Affiliation(s)
- Didier Dreyfuss
- Service de Réanimation Médico-Chirurgicale, Hôpital Louis Mourier, AP-HP, 92700, Colombes, France. .,UMR 1137, IAME, INSERM, 75018, Paris, France. .,UMR 1137, IAME, Univ Paris Diderot, Sorbonne Paris Cité, 75018, Paris, France.
| | - Jean-Damien Ricard
- Service de Réanimation Médico-Chirurgicale, Hôpital Louis Mourier, AP-HP, 92700, Colombes, France.,UMR 1137, IAME, INSERM, 75018, Paris, France.,UMR 1137, IAME, Univ Paris Diderot, Sorbonne Paris Cité, 75018, Paris, France
| | - Stéphane Gaudry
- Service de Réanimation Médico-Chirurgicale, Hôpital Louis Mourier, AP-HP, 92700, Colombes, France.,UMR 1137, IAME, INSERM, 75018, Paris, France.,UMR 1123, ECEVE, Univ Paris Diderot, Sorbonne Paris Cité, 75018, Paris, France
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McLean B. Hemodynamics of Acute Right Heart Failure in Mechanically Ventilated Patients with Acute Respiratory Distress Syndrome. Crit Care Nurs Clin North Am 2015; 27:449-67. [PMID: 26567491 DOI: 10.1016/j.cnc.2015.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
In critically ill patients with circulatory shock, the role of the left ventricle has long been appreciated and the object of measurement and therapeutic targeting. The right ventricle is often under appreciated and dysfunction may be overlooked. Generally, the right ventricle operates passively to support the ejection of the left ventricular diastolic volume. A loss of right ventricular wall compliance secondary to pulmonary pressures may result in an alteration in the normal pressure-volume relationship, ultimately affecting the stroke volume and cardiac output. Traditional right heart filling indices may increase because of decreasing compliance, further complicating the picture. The pathophysiology of pulmonary vascular dysfunction in acute respiratory distress syndrome combined with the effects of a mean airway pressure strategy may create an acute cor pulmonale.
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Affiliation(s)
- Barbara McLean
- Division of Critical Care, Grady Health System, Atlanta, GA, USA.
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Ursulet L, Roussiaux A, Belcour D, Ferdynus C, Gauzere BA, Vandroux D, Jabot J. Right over left ventricular end-diastolic area relevance to predict hemodynamic intolerance of high-frequency oscillatory ventilation in patients with severe ARDS. Ann Intensive Care 2015; 5:25. [PMID: 26380993 PMCID: PMC4573736 DOI: 10.1186/s13613-015-0068-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 09/08/2015] [Indexed: 01/19/2023] Open
Abstract
Background High-frequency oscillatory ventilation (HFOV) does not improve the prognosis of ARDS patients despite an improvement in oxygenation. This paradox may partly be explained by HFOV hemodynamic side-effects on right ventricular function. Our goal was to study the link between HFOV and hemodynamic effects and to test if the pre-HFOV right over left ventricular end-diastolic area (RVEDA/LVEDA) ratio, as a simple parameter of afterload-related RV dysfunction, could be used to predict HFOV hemodynamic intolerance in patients with severe ARDS. Methods Twenty-four patients were studied just before and within 3 h of HFOV using transthoracic echocardiography and transpulmonary thermodilution. Results Before HFOV, the mean PaO2/FiO2 ratio was 89 ± 23. The number of patients with a RVEDA/LVEDA ratio >0.6 significantly increased after HFOV [11 (46 %) vs. 17 (71 %)]. Although HFOV did not significantly decrease the arterial pressure (systolic, diastolic, mean and pulse pressure), it significantly decreased the cardiac index (CI) by 13 ± 18 % and significantly increased the RVEDA/LVEDA ratio by 14 ± 11 %. A significant correlation was observed between pre-HFOV RVEDA/LVEDA ratio and CI diminution after HFOV (r = 0.78; p < 0.0001). A RVEDA/LVEDA ratio superior to 0.6 resulted in a CI decrease >15 % during HFOV with a sensitivity of 80 % (95 % confidence interval 44–98 %) and a specificity of 79 % (confidence interval 49–95 %). Conclusion The RVEDA/LVEDA ratio measured just before HFOV predicts the hemodynamic intolerance of this technique in patients with severe ARDS. A high ratio under CMV raises questions about the use of HFOV in such patients. Trial registration: ClinicalTrials.gov: NCT01167621
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Affiliation(s)
- Lionel Ursulet
- Medical Surgical Intensive Care Unit, Saint Denis University Hospital, Saint Denis, Reunion Island, France.
| | - Arnaud Roussiaux
- Medical Surgical Intensive Care Unit, Saint Denis University Hospital, Saint Denis, Reunion Island, France.
| | - Dominique Belcour
- Medical Surgical Intensive Care Unit, Saint Denis University Hospital, Saint Denis, Reunion Island, France.
| | - Cyril Ferdynus
- Methodological Support and Biostatistics Unit, Saint Denis University Hospital, Saint Denis, Reunion Island, France.
| | - Bernard-Alex Gauzere
- Medical Surgical Intensive Care Unit, Saint Denis University Hospital, Saint Denis, Reunion Island, France.
| | - David Vandroux
- Medical Surgical Intensive Care Unit, Saint Denis University Hospital, Saint Denis, Reunion Island, France.
| | - Julien Jabot
- Medical Surgical Intensive Care Unit, Saint Denis University Hospital, Saint Denis, Reunion Island, France.
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46
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Krishnan S, Schmidt GA. Acute right ventricular dysfunction: real-time management with echocardiography. Chest 2015; 147:835-846. [PMID: 25732449 DOI: 10.1378/chest.14-1335] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
In critically ill patients, the right ventricle is susceptible to dysfunction due to increased afterload, decreased contractility, or alterations in preload. With the increased use of point-of-care ultrasonography and a decline in the use of pulmonary artery catheters, echocardiography can be the ideal tool for evaluation and to guide hemodynamic and respiratory therapy. We review the epidemiology of right ventricular failure in critically ill patients; echocardiographic parameters for evaluating the right ventricle; and the impact of mechanical ventilation, fluid therapy, and vasoactive infusions on the right ventricle. Finally, we summarize the principles of management in the context of right ventricular dysfunction and provide recommendations for echocardiography-guided management.
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47
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High-frequency Ventilation Does Not Provide Mortality Benefit in Comparison with Conventional Lung-protective Ventilation in Acute Respiratory Distress Syndrome. Anesthesiology 2015; 122:841-51. [DOI: 10.1097/aln.0000000000000306] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Abstract
Background:
Despite implementation of lung-protective ventilation strategy, acute respiratory distress syndrome is associated with significant mortality, which necessitates the evaluation of ventilatory modes other than conventional lung-protective strategy. This meta-analysis of the randomized controlled trials has been undertaken to know whether high-frequency oscillatory ventilation (HFOV) provides any mortality benefit over conventional ventilation in adult patients with acute respiratory distress syndrome.
Methods:
Published randomized controlled trials comparing HFOV with conventional lung-protective ventilation in adult patients with acute respiratory distress syndrome were included in this meta-analysis.
Results:
A total 1,759 patient data from seven randomized controlled trials have been analyzed here. Primary outcome of the review is in-hospital/30-day mortality and secondary outcomes are duration of intensive care unit stay, duration of mechanical ventilation, requirement of additional treatment, and complications associated with the interventions. HFOV does not offer any in-hospital/30-day mortality benefit (386 of 886 in HFOV vs. 368 of 873 in conventional ventilation; risk ratio, 0.96; 95% CI, 0.77 to 1.19; P = 0.70) over conventional ventilation. It may also prolong the duration of mechanical ventilation (mean difference, 1.18 days; 95% CI, 0.00 to 2.35 days; P = 0.05). Duration of intensive care unit stay (mean difference, 1.24 days; 95% CI, −0.08 to 2.56 days; P = 0.06) and requirement of neuromuscular blocker is similar between two treatment arm. Incidence of refractory hypoxemia is significantly less (risk ratio, 0.60; 95% CI, 0.39 to 0.93; P = 0.02) with the use of HFOV. HFOV is not associated with increased incidence of barotrauma and refractory hypotension.
Conclusion:
HFOV should not be used routinely in all adult patients with acute respiratory distress syndrome as primary ventilation strategy in place of conventional lung-protective ventilation.
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48
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Repessé X, Charron C, Vieillard-Baron A. Acute cor pulmonale in ARDS: rationale for protecting the right ventricle. Chest 2015; 147:259-265. [PMID: 25560864 DOI: 10.1378/chest.14-0877] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The ventilatory strategy for ARDS has been regularly amended over the last 40 years as knowledge of the pathophysiology of ARDS has increased. Initially focused mainly on the lung with the objectives of "opening the lung" and optimizing arterial oxygen saturation, this strategy now also takes into account pulmonary vascular injury and its effects on the right ventricle and on hemodynamics. Hemodynamic devices now available at the bedside, such as echocardiography, allow intensivists to evaluate respiratory settings according to right ventricular tolerance. Here, we review the pathophysiology of pulmonary vascular dysfunction in ARDS, consider the beneficial and deleterious effects of mechanical ventilation, describe the incidence and meaning of acute cor pulmonale based on recent studies in large series of patients, and propose a new, although not strictly validated, approach based on the protection of both the lung and right ventricle. One of our conclusions is that evaluating the right ventricle may help intensivists to assess the balance between recruitment and overdistension induced by the ventilatory strategy. Prone positioning with its beneficial effects on the lung and also on hemodynamics (the right ventricle) is a good illustration of this. Readers should be aware that most of the information given in this article reflects the point of view of the authors. Although based on clinical observations, clinical studies, and well-known pathophysiology, there is no evidence-based medicine to support this clinical commentary. Other approaches may be favored, in which case our article should be read as another attempt to help intensivists to improve management of ARDS.
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Affiliation(s)
- Xavier Repessé
- Section Thorax-Vascular Disease-Abdomen-Metabolism, Université de Versailles Saint-Quentin-en-Yvelines, Saint-Quentin en Yvelines, France
| | - Cyril Charron
- Section Thorax-Vascular Disease-Abdomen-Metabolism, Université de Versailles Saint-Quentin-en-Yvelines, Saint-Quentin en Yvelines, France
| | - Antoine Vieillard-Baron
- Intensive Care Unit, Ambroise-Paré, Hôpitaux Universitaires Paris Ile-de-France Ouest, Assistance Publique Hôpitaux de Paris, Boulogne-Billancourt; and Faculty of Medicine Paris Ile-de-France Ouest, Université de Versailles Saint-Quentin-en-Yvelines, Saint-Quentin en Yvelines, France.; Section Thorax-Vascular Disease-Abdomen-Metabolism, Université de Versailles Saint-Quentin-en-Yvelines, Saint-Quentin en Yvelines, France..
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Tidal volume and plateau pressure use for acute lung injury from 2000 to present: a systematic literature review. Crit Care Med 2014; 42:2278-89. [PMID: 25098333 DOI: 10.1097/ccm.0000000000000504] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
OBJECTIVE Since publication of the Respiratory Management of Acute Lung Injury and Acute Respiratory Distress Syndrome (ARMA) trial in 2000, use of tidal volume (VT) less than or equal to 6 mL/kg predicted body weight with corresponding plateau airway pressures (PPlat) less than or equal to 30 cm H2O has been advocated for acute lung injury. However, compliance with these recommendations is unknown. We therefore investigated VT (mL/kg predicted body weight) and PPlat (cm H2O) practices reported in studies of acute lung injury since ARMA using a systematic literature review (i.e., not a meta-analysis). DATA SOURCES PubMed, Scopus, and EMBASE. STUDY SELECTION Randomized controlled trials and nonrandomized studies enrolling patients with acute lung injury from May 2000 to June 2013 and reporting VT. DATA EXTRACTION Whether the study was a randomized controlled trial or a nonrandomized study and performed or not at an Acute Respiratory Distress Syndrome Network center; in randomized controlled trials, the pre- and postrandomization VT (mL/kg predicted body weight) and PPlat (cm H2O) and whether a VT protocol was used postrandomization; in nonrandomized studies, baseline VT and PPlat. DATA SYNTHESIS Twenty-two randomized controlled trials and 71 nonrandomized studies were included. Since 2000 at acute respiratory distress syndrome Network centers, routine VT was similar comparing randomized controlled trials and nonrandomized studies (p = 0.25) and unchanged over time (p = 0.75) with a mean value of 6.81 (95% CI, 6.45, 7.18). At non-acute respiratory distress syndrome Network centers, routine VT was also similar when comparing randomized controlled trials and nonrandomized studies (p = 0.71), but decreased (p = 0.001); the most recent estimate for it was 6.77 (6.22, 7.32). All VT estimates were significantly greater than 6 (p ≤ 0.02). In randomized controlled trials employing VT protocols, routine VT was reduced in both acute respiratory distress syndrome Network (n = 4) and non-acute respiratory distress syndrome Network (n = 11) trials (p ≤ 0.01 for both), but even postrandomization was greater than 6 (6.47 [6.29, 6.65] and 6.80 [6.42, 7.17], respectively; p ≤ 0.0001 for both). In 59 studies providing data, routine PPlat, averaged across acute respiratory distress syndrome Network or non-acute respiratory distress syndrome Network centers, was significantly less than 30 (p ≤ 0.02). CONCLUSIONS For clinicians treating acute lung injury since 2000, achieving VT less than or equal to 6 mL/kg predicted body weight may not have been as attainable or important as PPlat less than or equal to 30 cm H2O. If so, there may be equipoise to test if VT less than or equal to 6 mL/kg predicted body weight are necessary to improve acute lung injury outcome.
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High-frequency oscillatory ventilation for early acute respiratory distress syndrome in adults. Curr Opin Crit Care 2014; 20:77-85. [PMID: 24356284 DOI: 10.1097/mcc.0000000000000060] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
PURPOSE OF REVIEW High-frequency oscillatory ventilation (HFOV) has been considered a potentially ideal mode of lung-protective ventilation. A recent meta-analysis suggested improved oxygenation and reduced mortality in adults and children with acute respiratory distress syndrome (ARDS), but the use of outdated control strategies and small numbers of patients in many of the studies rendered these findings hypothesis-generating only. RECENT FINDINGS During 2013, two large randomized controlled trials comparing HFOV with a conventional lung-protective ventilation were published - the Oscillation for Acute Respiratory Distress Syndrome Treated Early (OSCILLATE) and the Oscillation in ARDS (OSCAR) trials. These trials suggested no benefit or even harm with HFOV in adults with early moderate-to-severe ARDS. In this article, the major characteristics of these two studies and the possible reasons for failure to achieve the expected theoretical benefits are reviewed. Moreover, future directions with potential new technical advances and the use of new bedside monitoring techniques are addressed. SUMMARY The OSCILLATE and OSCAR trials showed that the early application of HFOV in moderate-to-severe adult ARDS does not reduce mortality compared with conventional ventilation strategies. Future studies on HFOV will need to identify those patients who might benefit most from HFOV and to determine the best oscillator settings. Both goals require an improved capability of monitoring recruitment and overdistension, and oscillatory volumes.
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