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Pediatric Acute Respiratory Distress Syndrome: Approaches in Mechanical Ventilation. Pediatr Crit Care Med 2023; 24:e104-e114. [PMID: 36521192 DOI: 10.1097/pcc.0000000000003138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Umbrello M, Lassola S, Sanna A, Pace R, Magnoni S, Miori S. Chest wall loading during supine and prone position in patients with COVID-19 ARDS: effects on respiratory mechanics and gas exchange. Crit Care 2022; 26:277. [PMID: 36100903 PMCID: PMC9470071 DOI: 10.1186/s13054-022-04141-7] [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: 04/28/2022] [Accepted: 08/08/2022] [Indexed: 11/25/2022] Open
Abstract
Background Recent reports of patients with severe, late-stage COVID-19 ARDS with reduced respiratory system compliance described paradoxical decreases in plateau pressure and increases in respiratory system compliance in response to anterior chest wall loading. We aimed to assess the effect of chest wall loading during supine and prone position in ill patients with COVID-19-related ARDS and to investigate the effect of a low or normal baseline respiratory system compliance on the findings. Methods This is a single-center, prospective, cohort study in the intensive care unit of a COVID-19 referral center. Consecutive mechanically ventilated, critically ill patients with COVID-19-related ARDS were enrolled and classified as higher (≥ 40 ml/cmH2O) or lower respiratory system compliance (< 40 ml/cmH2O). The study included four steps, each lasting 6 h: Step 1, supine position, Step 2, 10-kg continuous chest wall compression (supine + weight), Step 3, prone position, Step 4, 10-kg continuous chest wall compression (prone + weight). The mechanical properties of the respiratory system, gas exchange and alveolar dead space were measured at the end of each step. Results Totally, 40 patients were enrolled. In the whole cohort, neither oxygenation nor respiratory system compliance changed between supine and supine + weight; both increased during prone positioning and were unaffected by chest wall loading in the prone position. Alveolar dead space was unchanged during all the steps. In 16 patients with reduced compliance, PaO2/FiO2 significantly increased from supine to supine + weight and further with prone and prone + weight (107 ± 15.4 vs. 120 ± 18.5 vs. 146 ± 27.0 vs. 159 ± 30.4, respectively; p < 0.001); alveolar dead space decreased from both supine and prone position after chest wall loading, and respiratory system compliance significantly increased from supine to supine + weight and from prone to prone + weight (23.9 ± 3.5 vs. 30.9 ± 5.7 and 31.1 ± 5.7 vs. 37.8 ± 8.7 ml/cmH2O, p < 0.001). The improvement was higher the lower the baseline compliance. Conclusions Unlike prone positioning, chest wall loading had no effects on respiratory system compliance, gas exchange or alveolar dead space in an unselected cohort of critically ill patients with C-ARDS. Only patients with a low respiratory system compliance experienced an improvement, with a higher response the lower the baseline compliance. Supplementary Information The online version contains supplementary material available at 10.1186/s13054-022-04141-7.
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Dzierzawski P, Oswalt J, Wirth S, Schumann S. Intratidal compliance of the lung and the total respiratory system. Physiol Meas 2022; 43. [PMID: 36044904 DOI: 10.1088/1361-6579/ac8e4d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 08/31/2022] [Indexed: 11/11/2022]
Abstract
OBJECTIVE The worldwide rising quantity of surgeries and corresponding need of mechanical ventilation implicates a rising number of patients suffering from post-operative pulmonary complications. To prevent this risks, individual mechanics of the lung should be considered when setting the parameters of mechanical ventilation. Intratidal compliance analysis based on transpulmonal pressure would provide an estimate for individual lung mechanics. The downside of such measure however, is its invasiveness. Accurate measurement requires recording of the esophageal pressure as surrogate for the actual pleural pressure. Measuring pressure at the airway opening is considerably easier, but the resulting mechanics of the respiratory system may not represent the actual lung mechanics in a straight forward fashion. APPROACH In order to evaluate if the mechanics of the lungs are represented by those resulting from analysis of the mechanics of the respiratory system we determined intratidal dynamic compliance-volume profiles of both in 23 lung-healthy mechanically ventilated patients undergoing elective surgery. We also compared the accuracy of the compliance profiles resulting from analysis of the total breath with those resulting from the analysis of inspiration data only. MAIN RESULTS When the whole breath was analyzed 54.3%, and with only inspiration data 69.6% of compliance profiles of the respiratory system matched those of the lung. With both approaches profiles of the lung and the respiratory system matched or deviated by only one neighboring step (75% whole breath, 91.3% only inspiration), and never contradicted each other. SIGNIFICANCE Compliance profiles calculated from volume and pressure data of the respiratory system are an adequate surrogate for the compliance profiles of the lungs of lung-healthy patients. Therefore, invasive assessment of esophageal pressure for achievement of intrapleural pressure is unnecessary. The compliance profiles based on inspiratory data only appear more sensitive for indicating intratidal derecruitment than those based on data of the whole breath.
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Affiliation(s)
- Patryk Dzierzawski
- Anaesthesiology and Critical Care, Universitatsklinikum Freiburg, Hugstetter Straße 55, Freiburg, 79106, GERMANY
| | - Jakob Oswalt
- Anaesthesiology and Critical Care, Universitatsklinikum Freiburg, Hugstetter Straße 55, Freiburg, 79106, GERMANY
| | - Steffen Wirth
- Anaesthesiology and Critical Care, Universitatsklinikum Freiburg, Hugstetter Straße 55, Freiburg, 79106, GERMANY
| | - Stefan Schumann
- Anesthesiology and Critical Care, Universitatsklinikum Freiburg, Hugstetter Straße 55, Freiburg, Baden-Württemberg, 79106, GERMANY
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Liu W, Tao G, Zhang Y, Xiao W, Zhang J, Liu Y, Lu Z, Hua T, Yang M. A Simple Weaning Model Based on Interpretable Machine Learning Algorithm for Patients With Sepsis: A Research of MIMIC-IV and eICU Databases. Front Med (Lausanne) 2022; 8:814566. [PMID: 35118099 PMCID: PMC8804204 DOI: 10.3389/fmed.2021.814566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 12/13/2021] [Indexed: 11/13/2022] Open
Abstract
BackgroundInvasive mechanical ventilation plays an important role in the prognosis of patients with sepsis. However, there are, currently, no tools specifically designed to assess weaning from invasive mechanical ventilation in patients with sepsis. The aim of our study was to develop a practical model to predict weaning in patients with sepsis.MethodsWe extracted patient information from the Medical Information Mart for Intensive Care Database-IV (MIMIC-IV) and the eICU Collaborative Research Database (eICU-CRD). Kaplan–Meier curves were plotted to compare the 28-day mortality between patients who successfully weaned and those who failed to wean. Subsequently, MIMIC-IV was divided into a training set and an internal verification set, and the eICU-CRD was designated as the external verification set. We selected the best model to simplify the internal and external validation sets based on the performance of the model.ResultsA total of 5020 and 7081 sepsis patients with invasive mechanical ventilation in MIMIC-IV and eICU-CRD were included, respectively. After matching, weaning was independently associated with 28-day mortality and length of ICU stay (p < 0.001 and p = 0.002, respectively). After comparison, 35 clinical variables were extracted to build weaning models. XGBoost performed the best discrimination among the models in the internal and external validation sets (AUROC: 0.80 and 0.86, respectively). Finally, a simplified model was developed based on XGBoost, which included only four variables. The simplified model also had good predictive performance (AUROC:0.75 and 0.78 in internal and external validation sets, respectively) and was developed into a web-based tool for further review.ConclusionsWeaning success is independently related to short-term mortality in patients with sepsis. The simplified model based on the XGBoost algorithm provides good predictive performance and great clinical applicablity for weaning, and a web-based tool was developed for better clinical application.
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Affiliation(s)
- Wanjun Liu
- The 2nd Department of Intensive Care Unit, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
- The Laboratory of Cardiopulmonary Resuscitation and Critical Care Medicine, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Gan Tao
- The 2nd Department of Intensive Care Unit, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Yijun Zhang
- The 2nd Department of Intensive Care Unit, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
- The Laboratory of Cardiopulmonary Resuscitation and Critical Care Medicine, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Wenyan Xiao
- The 2nd Department of Intensive Care Unit, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
- The Laboratory of Cardiopulmonary Resuscitation and Critical Care Medicine, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Jin Zhang
- The 2nd Department of Intensive Care Unit, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
- The Laboratory of Cardiopulmonary Resuscitation and Critical Care Medicine, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Yu Liu
- Key Laboratory of Intelligent Computing and Signal Processing, Ministry of Education, Anhui University, Hefei, China
| | - Zongqing Lu
- The 2nd Department of Intensive Care Unit, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
- The Laboratory of Cardiopulmonary Resuscitation and Critical Care Medicine, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Tianfeng Hua
- The 2nd Department of Intensive Care Unit, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
- The Laboratory of Cardiopulmonary Resuscitation and Critical Care Medicine, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Min Yang
- The 2nd Department of Intensive Care Unit, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
- The Laboratory of Cardiopulmonary Resuscitation and Critical Care Medicine, The Second Affiliated Hospital of Anhui Medical University, Hefei, China
- *Correspondence: Min Yang
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Over-distension prediction via hysteresis loop analysis and patient-specific basis functions in a virtual patient model. Comput Biol Med 2021; 141:105022. [PMID: 34801244 DOI: 10.1016/j.compbiomed.2021.105022] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 11/02/2021] [Accepted: 11/04/2021] [Indexed: 12/20/2022]
Abstract
BACKGROUND AND OBJECTIVE Recruitment maneuvers (RMs) with subsequent positive-end-expiratory-pressure (PEEP) have proven effective in recruiting lung volume and preventing alveolar collapse. However, a suboptimal PEEP could induce undesired injury in lungs by insufficient or excessive breath support. Thus, a predictive model for patient response under PEEP changes could improve clinical care and lower risks. METHODS This research adds novel elements to a virtual patient model to identify and predict patient-specific lung distension to optimise and personalise care. Model validity and accuracy are validated using data from 18 volume-controlled ventilation (VCV) patients at 7 different baseline PEEP levels (0-12cmH2O), yielding 623 prediction cases. Predictions were made up to ΔPEEP = 12cmH2O ahead covering 6x2cmH2O PEEP steps. RESULTS Using the proposed lung distension model, 90% of absolute peak inspiratory pressure (PIP) prediction errors compared to clinical measurement are within 3.95cmH2O, compared with 4.76cmH2O without this distension term. Comparing model-predicted and clinically measured distension had high correlation increasing to R2 = 0.93-0.95 if maximum ΔPEEP ≤ 6cmH2O. Predicted dynamic functional residual capacity (Vfrc) changes as PEEP rises yield 0.013L median prediction error for both prediction groups and overall R2 of 0.84. CONCLUSIONS Overall results demonstrate nonlinear distension mechanics are accurately captured in virtual lung mechanics patients for mechanical ventilation, for the first time. This result can minimise the risk of lung injury by predicting its potential occurrence of distension before changing ventilator settings. The overall outcomes significantly extend and more fully validate this virtual mechanical ventilation patient model.
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Response to Ventilator Adjustments for Predicting Acute Respiratory Distress Syndrome Mortality. Driving Pressure versus Oxygenation. Ann Am Thorac Soc 2021; 18:857-864. [PMID: 33112644 DOI: 10.1513/annalsats.202007-862oc] [Citation(s) in RCA: 17] [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: Clinicians commonly use short-term physiologic markers to assess the benefit of ventilator adjustments. Improved arterial oxygen tension/pressure (PaO2)/fraction of inspired oxygen (FiO2) after ventilator adjustment in acute respiratory distress syndrome is associated with lower mortality. However, as driving pressure (ΔP) reflects lung stress and strain, changes in ΔP may more accurately reflect benefits or harms of ventilator adjustments compared with changes in oxygenation.Objectives: We aimed to compare the association between mortality and the changes in PaO2/FiO2 and ΔP following protocolized ventilator changes.Methods: We assessed associations between mortality and changes in PaO2/FiO2 (ΔPaO2/FiO2) and ΔP (ΔΔP) after postrandomization positive end-expiratory pressure (PEEP) and tidal volume adjustment in reanalyses of the ALVEOLI (Assessment of Low Tidal Volume and Elevated End-Expiratory Volume to Obviate Lung Injury) and ExPress (Expiratory Pressure) trials. We included subjects with available pre- and postintervention PaO2/FiO2 and ΔP (372 in ALVEOLI and 596 in ExPress). In each separate trial cohort, we performed multivariable Cox regression testing the association between ΔPaO2/FiO2 and ΔΔP with mortality.Results: In ALVEOLI, when analyzed as separate variables, ΔPaO2/FiO2 was associated with mortality only in subjects in whom PEEP increased, whereas ΔΔP was associated with mortality irrespective of direction of PEEP change. When modeled together, improved ΔPaO2/FiO2 was not associated with mortality, whereas ΔΔP remained associated with mortality (adjusted hazard ratio [aHR], 1.50 per 5 cm H2O increase; 95% confidence interval [95% CI], 1.21-1.85). When modeled together in ExPress, ΔΔP (aHR, 1.42; 95% CI, 1.14-1.78) was more strongly associated with mortality than ΔPaO2/FiO2 (aHR, 0.95 per 25 mm Hg increase; 95% CI, 0.90-1.00).Conclusions: Reduced ΔP following protocolized ventilator changes was more strongly and consistently associated with lower mortality than was increased PaO2/FiO2, making ΔΔP more informative about benefit from ventilator adjustments. Our results reinforce the primacy of ΔP, rather than oxygenation, as the key variable associated with outcome.
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Utility of Driving Pressure and Mechanical Power to Guide Protective Ventilator Settings in Two Cohorts of Adult and Pediatric Patients With Acute Respiratory Distress Syndrome: A Computational Investigation. Crit Care Med 2021; 48:1001-1008. [PMID: 32574467 DOI: 10.1097/ccm.0000000000004372] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVES Mechanical power and driving pressure have been proposed as indicators, and possibly drivers, of ventilator-induced lung injury. We tested the utility of these different measures as targets to derive maximally protective ventilator settings. DESIGN A high-fidelity computational simulator was matched to individual patient data and used to identify strategies that minimize driving pressure, mechanical power, and a modified mechanical power that removes the direct linear, positive dependence between mechanical power and positive end-expiratory pressure. SETTING Interdisciplinary Collaboration in Systems Medicine Research Network. SUBJECTS Data were collected from a prospective observational cohort of pediatric acute respiratory distress syndrome from the Children's Hospital of Philadelphia (n = 77) and from the low tidal volume arm of the Acute Respiratory Distress Syndrome Network tidal volume trial (n = 100). INTERVENTIONS Global optimization algorithms evaluated more than 26.7 million changes to ventilator settings (approximately 150,000 per patient) to identify strategies that minimize driving pressure, mechanical power, or modified mechanical power. MEASUREMENTS AND MAIN RESULTS Large average reductions in driving pressure (pediatric: 23%, adult: 23%), mechanical power (pediatric: 44%, adult: 66%), and modified mechanical power (pediatric: 61%, adult: 67%) were achievable in both cohorts when oxygenation and ventilation were allowed to vary within prespecified ranges. Reductions in driving pressure (pediatric: 12%, adult: 2%), mechanical power (pediatric: 24%, adult: 46%), and modified mechanical power (pediatric: 44%, adult: 46%) were achievable even when no deterioration in gas exchange was allowed. Minimization of mechanical power and modified mechanical power was achieved by increasing tidal volume and decreasing respiratory rate. In the pediatric cohort, minimum driving pressure was achieved by reducing tidal volume and increasing respiratory rate and positive end-expiratory pressure. The Acute Respiratory Distress Syndrome Network dataset had limited scope for further reducing tidal volume, but driving pressure was still significantly reduced by increasing positive end-expiratory pressure. CONCLUSIONS Our analysis identified different strategies that minimized driving pressure or mechanical power consistently across pediatric and adult datasets. Minimizing standard and alternative formulations of mechanical power led to significant increases in tidal volume. Targeting driving pressure for minimization resulted in ventilator settings that also reduced mechanical power and modified mechanical power, but not vice versa.
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Fodor GH, Bayat S, Albu G, Lin N, Baudat A, Danis J, Peták F, Habre W. Variable Ventilation Is Equally Effective as Conventional Pressure Control Ventilation for Optimizing Lung Function in a Rabbit Model of ARDS. Front Physiol 2019; 10:803. [PMID: 31297064 PMCID: PMC6607923 DOI: 10.3389/fphys.2019.00803] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 06/06/2019] [Indexed: 11/24/2022] Open
Abstract
Background Introducing mathematically derived variability (MVV) into the otherwise monotonous conventional mechanical ventilation has been suggested to improve lung recruitment and gas exchange. Although the application of a ventilation pattern based on variations in physiological breathing (PVV) is beneficial for healthy lungs, its value in the presence of acute respiratory distress syndrome (ARDS) has not been characterized. We therefore aimed at comparing conventional pressure-controlled ventilation with (PCS) or without regular sighs (PCV) to MVV and PVV at two levels of positive end-expiratory pressure (PEEP) in a model of severe ARDS. Methods Anesthetised rabbits (n = 54) were mechanically ventilated and severe ARDS (PaO2/FiO2 ≤ 150 mmHg) was induced by combining whole lung lavage, i.v. endotoxin and injurious ventilation. Rabbits were then randomly assigned to be ventilated with PVV, MVV, PCV, or PCS for 5 h while maintaining either 6 or 9 cmH2O PEEP. Ventilation parameters, blood gas indices and respiratory mechanics (tissue damping, G, and elastance, H) were recorded hourly. Serum cytokine levels were assessed with ELISA and lung histology was analyzed. Results Although no progression of lung injury was observed after 5 h of ventilation at PEEP 6 cmH2O with PVV and PCV, values for G (58.8 ± 71.1[half-width of 95% CI]% and 40.8 ± 39.0%, respectively), H (54.5 ± 57.2%, 50.7 ± 28.3%), partial pressure of carbon-dioxide (PaCO2, 43.9 ± 23.8%, 46.2 ± 35.4%) and pH (−4.6 ± 3.3%, −4.6 ± 2.2%) worsened with PCS and MVV. Regardless of ventilation pattern, application of a higher PEEP improved lung function and precluded progression of lung injury and inflammation. Histology lung injury scores were elevated in all groups with no difference between groups at either PEEP level. Conclusion At moderate PEEP, variable ventilation based on a pre-recorded physiological breathing pattern protected against progression of lung injury equally to the conventional pressure-controlled mode, whereas mathematical variability or application of regular sighs caused worsening in lung mechanics. This outcome may be related to the excessive increases in peak inspiratory pressure with the latter ventilation modes. However, a greater benefit on respiratory mechanics and gas exchange could be obtained by elevating PEEP, compared to the ventilation mode in severe ARDS.
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Affiliation(s)
- Gergely H Fodor
- Unit for Anesthesiological Investigations, Geneva University Hospitals - University of Geneva, Geneva, Switzerland
| | - Sam Bayat
- Unit for Anesthesiological Investigations, Geneva University Hospitals - University of Geneva, Geneva, Switzerland.,Inserm UA7 STROBE Laboratory, Department of Clinical Physiology, Sleep and Exercise, Grenoble University Hospital, Grenoble, France
| | - Gergely Albu
- Unit for Anesthesiological Investigations, Geneva University Hospitals - University of Geneva, Geneva, Switzerland
| | - Na Lin
- Unit for Anesthesiological Investigations, Geneva University Hospitals - University of Geneva, Geneva, Switzerland.,Department of Anesthesiology, Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Aurélie Baudat
- Unit for Anesthesiological Investigations, Geneva University Hospitals - University of Geneva, Geneva, Switzerland
| | - Judit Danis
- MTA-SZTE Dermatological Research Group, University of Szeged, Szeged, Hungary
| | - Ferenc Peták
- Department of Medical Physics and Informatics, University of Szeged, Szeged, Hungary
| | - Walid Habre
- Unit for Anesthesiological Investigations, Geneva University Hospitals - University of Geneva, Geneva, Switzerland
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Kang H, Yang H, Tong Z. Recruitment manoeuvres for adults with acute respiratory distress syndrome receiving mechanical ventilation: a systematic review and meta-analysis. J Crit Care 2019; 50:1-10. [PMID: 30453220 PMCID: PMC10013696 DOI: 10.1016/j.jcrc.2018.10.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 10/30/2018] [Accepted: 10/31/2018] [Indexed: 12/31/2022]
Abstract
PURPOSE To determine if recruitment manoeuvres (RMs) would decrease 28-day mortality of patients with acute respiratory distress syndrome (ARDS) compared with standard care. MATERIALS AND METHODS Relevant randomized controlled trials (RCTs) published prior to April 26, 2018 were systematically searched. The primary outcome was mortality. The secondary outcomes were oxygenation, barotrauma or pneumothorax, the need for rescue therapies. Data were pooled using the random effects model. And the quality of evidence was assessed by the GRADE system. RESULTS Of 3180 identified studies, 15 were eligibly included in our analysis (N = 2755 participants). In the primary outcome, RMs were not associated with reducing 28-day mortality (RR 0.90; 95% CI 0.74-1.09), ICU mortality (RR 0.92; 95% CI 0.74-1.1), and the in-hospital mortaliy (RR 1.02; 95% CI 0.93-1.12). In the secondary outcomes, RMs could improve oxygenation (MD 37.85; 95% CI 11.08-64.61), the rates of barotrauma (RR 1.42; 95% CI 0.83-2.42) and the need for rescue therapies (RR 0.69; 95% CI 0.42-1.12) did not show any difference in the ARDS patients with RMs. CONCLUSIONS Earlier meta-analyses found decreased mortality with RMs, in the contrary, our results indicate that RMs could improve oxygenation without detrimental effects, but it does not appear to reduce mortality.
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Affiliation(s)
- Hanyujie Kang
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, 100020, China
| | - Huqin Yang
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, 100020, China
| | - Zhaohui Tong
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, 100020, China.
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Heines SJH, Strauch U, van de Poll MCG, Roekaerts PMHJ, Bergmans DCJJ. Clinical implementation of electric impedance tomography in the treatment of ARDS: a single centre experience. J Clin Monit Comput 2018; 33:291-300. [PMID: 29845479 PMCID: PMC6420412 DOI: 10.1007/s10877-018-0164-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 05/27/2018] [Indexed: 11/24/2022]
Abstract
To report on our clinical experience using EIT in individualized PEEP titration in ARDS. Using EIT assessment, we optimized PEEP settings in 39 ARDS patients. The EIT PEEP settings were compared with the physicians' PEEP settings and the PEEP settings according to the ARDS network. We defined a PEEP difference equal to or greater than 4 cm H2O as clinically relevant. Changes in lung compliance and PaO2/FiO2-ratio were compared in patients with EIT-based PEEP adjustments and in patients with unaltered PEEP. In 28% of the patients, the difference in EIT-based PEEP and physician-PEEP was clinically relevant; in 36%, EIT-based PEEP and physician-PEEP were equal. The EIT-based PEEP disagreed with the PEEP settings according to the ARDS network. Adjusting PEEP based upon EIT led to a rapid increase in lung compliance and PaO2/FiO2-ratio. However, this increase was also observed in the group where the PEEP difference was less than 4 cm H2O. We hypothesize that this can be attributed to the alveolar recruitment during the PEEP trial. EIT based individual PEEP setting appears to be a promising method to optimize PEEP in ARDS patients. The clinical impact, however, remains to be established.
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Affiliation(s)
- Serge J H Heines
- Department of Intensive Care, Maastricht University Medical Centre+, P. Debyelaan 25, 6229HX, Maastricht, The Netherlands.
| | - Ulrich Strauch
- Department of Intensive Care, Maastricht University Medical Centre+, P. Debyelaan 25, 6229HX, Maastricht, The Netherlands
| | - Marcel C G van de Poll
- Department of Intensive Care, Maastricht University Medical Centre+, P. Debyelaan 25, 6229HX, Maastricht, The Netherlands.,Department of Surgery, Maastricht University Medical Centre+, P. Debyelaan 25, 6229HX, Maastricht, The Netherlands.,School of Nutrition and Translational Research in Medicine (NUTRIM), Maastricht University, P.O. Box 616, 6200MD, Maastricht, The Netherlands
| | - Paul M H J Roekaerts
- Department of Intensive Care, Maastricht University Medical Centre+, P. Debyelaan 25, 6229HX, Maastricht, The Netherlands.,Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, P.O. Box 616, 6200MD, Maastricht, The Netherlands
| | - Dennis C J J Bergmans
- Department of Intensive Care, Maastricht University Medical Centre+, P. Debyelaan 25, 6229HX, Maastricht, The Netherlands
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Algera AG, Pisani L, Bergmans DCJ, den Boer S, de Borgie CAJ, Bosch FH, Bruin K, Cherpanath TG, Determann RM, Dondorp AM, Dongelmans DA, Endeman H, Haringman JJ, Horn J, Juffermans NP, van Meenen DM, van der Meer NJ, Merkus MP, Moeniralam HS, Purmer I, Tuinman PR, Slabbekoorn M, Spronk PE, Vlaar APJ, Gama de Abreu M, Pelosi P, Serpa Neto A, Schultz MJ, Paulus F. RELAx - REstricted versus Liberal positive end-expiratory pressure in patients without ARDS: protocol for a randomized controlled trial. Trials 2018; 19:272. [PMID: 29739430 PMCID: PMC5941564 DOI: 10.1186/s13063-018-2640-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 04/10/2018] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Evidence for benefit of high positive end-expiratory pressure (PEEP) is largely lacking for invasively ventilated, critically ill patients with uninjured lungs. We hypothesize that ventilation with low PEEP is noninferior to ventilation with high PEEP with regard to the number of ventilator-free days and being alive at day 28 in this population. METHODS/DESIGN: The "REstricted versus Liberal positive end-expiratory pressure in patients without ARDS" trial (RELAx) is a national, multicenter, randomized controlled, noninferiority trial in adult intensive care unit (ICU) patients with uninjured lungs who are expected not to be extubated within 24 h. RELAx will run in 13 ICUs in the Netherlands to enroll 980 patients under invasive ventilation. In all patients, low tidal volumes are used. Patients assigned to ventilation with low PEEP will receive the lowest possible PEEP between 0 and 5 cm H2O, while patients assigned to ventilation with high PEEP will receive PEEP of 8 cm H2O. The primary endpoint is the number of ventilator-free days and being alive at day 28, a composite endpoint for liberation from the ventilator and mortality until day 28, with a noninferiority margin for a difference between groups of 0.5 days. Secondary endpoints are length of stay (LOS), mortality, and occurrence of pulmonary complications, including severe hypoxemia, major atelectasis, need for rescue therapies, pneumonia, pneumothorax, and development of acute respiratory distress syndrome (ARDS). Hemodynamic support and sedation needs will be collected and compared. DISCUSSION RELAx will be the first sufficiently sized randomized controlled trial in invasively ventilated, critically ill patients with uninjured lungs using a clinically relevant and objective endpoint to determine whether invasive, low-tidal-volume ventilation with low PEEP is noninferior to ventilation with high PEEP. TRIAL REGISTRATION ClinicalTrials.gov , ID: NCT03167580 . Registered on 23 May 2017.
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Affiliation(s)
- Anna Geke Algera
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
| | - Luigi Pisani
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
| | - Dennis C. J. Bergmans
- Department of Intensive Care, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Sylvia den Boer
- Department of Intensive Care, Spaarne Gasthuis, Haarlem and Hoofddorp, The Netherlands
| | | | - Frank H. Bosch
- Department of Intensive Care, Rijnstate, Arnhem, The Netherlands
| | - Karina Bruin
- Department of Intensive Care, Westfriesgasthuis, Hoorn, The Netherlands
| | - Thomas G. Cherpanath
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
| | - Rogier M. Determann
- Department of Intensive Care, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands
| | - Arjen M. Dondorp
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
- Madihol–Oxford Research Unit (MORU), Madihol University, Bangkok, Thailand
| | - Dave A. Dongelmans
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
| | - Henrik Endeman
- Department of Intensive Care, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands
| | | | - Janneke Horn
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
- Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Academic Medical Center, Amsterdam, The Netherlands
| | - Nicole P. Juffermans
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
- Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Academic Medical Center, Amsterdam, The Netherlands
| | - David M. van Meenen
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
| | | | | | - Hazra S. Moeniralam
- Department of Intensive Care, Sint Antonius Hospital, Nieuwegein, The Netherlands
| | - Ilse Purmer
- Department of Intensive Care, Haga Hospital, The Hague, The Netherlands
| | - Pieter Roel Tuinman
- Department of Intensive Care, VU Medical Center, Amsterdam, The Netherlands
- REVIVE Research VU Medical Center, VU Medical Center, Amsterdam, The Netherlands
| | - Mathilde Slabbekoorn
- Department of Intensive Care, Haaglanden Medical Center, The Hague, The Netherlands
| | - Peter E. Spronk
- Department of Intensive Care, Gelre Hospital, Apeldoorn, The Netherlands
| | - Alexander P. J. Vlaar
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
- Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Academic Medical Center, Amsterdam, The Netherlands
| | - Marcelo Gama de Abreu
- Department of Anesthesiology and Intensive Care, University Hospital Carl Gustav Carus, Dresden, Germany
| | - Paolo Pelosi
- Department of Surgical Sciences and Integrated Diagnostics, San Martino Policlinico Hospital – IRCCS for Oncology, University of Genoa, Genoa, Italy
| | - Ary Serpa Neto
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
- Department of Intensive Care Medicine, Hospital Israelita Albert Einstein, São Paulo, Brazil
| | - Marcus J. Schultz
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
- Department of Intensive Care, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands
- Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Academic Medical Center, Amsterdam, The Netherlands
| | - Frederique Paulus
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
| | - for the RELAx Investigators and the PROVE Network Investigators
- Department of Intensive Care, Academic Medical Center, Amsterdam, The Netherlands
- Department of Intensive Care, Maastricht University Medical Center, Maastricht, The Netherlands
- Department of Intensive Care, Spaarne Gasthuis, Haarlem and Hoofddorp, The Netherlands
- Clinical Research Unit, Academic Medical Center, Amsterdam, The Netherlands
- Department of Intensive Care, Rijnstate, Arnhem, The Netherlands
- Department of Intensive Care, Westfriesgasthuis, Hoorn, The Netherlands
- Department of Intensive Care, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands
- Madihol–Oxford Research Unit (MORU), Madihol University, Bangkok, Thailand
- Department of Intensive Care, Isala Clinics, Zwolle, The Netherlands
- Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Academic Medical Center, Amsterdam, The Netherlands
- Department of Intensive Care, Amphia Hospital, Breda, The Netherlands
- Department of Intensive Care, Sint Antonius Hospital, Nieuwegein, The Netherlands
- Department of Intensive Care, Haga Hospital, The Hague, The Netherlands
- Department of Intensive Care, VU Medical Center, Amsterdam, The Netherlands
- REVIVE Research VU Medical Center, VU Medical Center, Amsterdam, The Netherlands
- Department of Intensive Care, Haaglanden Medical Center, The Hague, The Netherlands
- Department of Intensive Care, Gelre Hospital, Apeldoorn, The Netherlands
- Department of Anesthesiology and Intensive Care, University Hospital Carl Gustav Carus, Dresden, Germany
- Department of Surgical Sciences and Integrated Diagnostics, San Martino Policlinico Hospital – IRCCS for Oncology, University of Genoa, Genoa, Italy
- Department of Intensive Care Medicine, Hospital Israelita Albert Einstein, São Paulo, Brazil
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12
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Bedirli N, Emmez G, Ünal Y, Tönge M, Emmez H. Effects of positive end-expiratory pressure on intracranial pressure during pneumoperitoneum and Trendelenburg position in a porcine mode. Turk J Med Sci 2017; 47:1610-1615. [PMID: 29152942 DOI: 10.3906/sag-1609-17] [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: 11/03/2022] Open
Abstract
Background/aim: This study was undertaken to evaluate the effects of positive end-expiratory pressure (PEEP) levels on intracranial pressure (ICP) and cerebral perfusion pressure (CPP) and to determine the appropriate PEEP level during steep Trendelenburg position combined with pneumoperitoneum.Materials and methods: Ten pigs were included in this study. Pneumoperitoneum and Trendelenburg position were maintained and PEEP titration was initiated. Arterial pressure, heart rate, arterial blood gas, ICP, and CPP were recorded at the following time points: baseline (T0), 30 min after positioning and pneumoperitoneum (T1), PEEP 5 (T2), PEEP 10 (T3), PEEP 15 (T4), and PEEP 20 (T5).Results: MAP significantly increased at T1 compared to T0 and decreased at T4 and T5 compared to T1. ICP was 9.5 mmHg and CPP was 69.3 mmHg at T0. CO2 insufflation and steep Trendelenburg position did not cause any significant difference in ICP and CPP. ICP increased and CPP decreased significantly at T4 and T5 compared to both T0 and T1. PaO2 and PaO2/FiO2 decreased significantly at T1 and T2 compared to T0, while both increased significantly at T3, T4, and T5 compared to T1.Conclusion: PEEP of 10 cmH2O was effective for providing oxygenation while preserving hemodynamic stability, ICP, and CPP in this model.
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13
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Cavalcanti AB, Suzumura ÉA, Laranjeira LN, Paisani DDM, Damiani LP, Guimarães HP, Romano ER, Regenga MDM, Taniguchi LNT, Teixeira C, Pinheiro de Oliveira R, Machado FR, Diaz-Quijano FA, Filho MSDA, Maia IS, Caser EB, Filho WDO, Borges MDC, Martins PDA, Matsui M, Ospina-Tascón GA, Giancursi TS, Giraldo-Ramirez ND, Vieira SRR, Assef MDGPDL, Hasan MS, Szczeklik W, Rios F, Amato MBP, Berwanger O, Ribeiro de Carvalho CR. Effect of Lung Recruitment and Titrated Positive End-Expiratory Pressure (PEEP) vs Low PEEP on Mortality in Patients With Acute Respiratory Distress Syndrome: A Randomized Clinical Trial. JAMA 2017; 318:1335-1345. [PMID: 28973363 PMCID: PMC5710484 DOI: 10.1001/jama.2017.14171] [Citation(s) in RCA: 550] [Impact Index Per Article: 78.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
IMPORTANCE The effects of recruitment maneuvers and positive end-expiratory pressure (PEEP) titration on clinical outcomes in patients with acute respiratory distress syndrome (ARDS) remain uncertain. OBJECTIVE To determine if lung recruitment associated with PEEP titration according to the best respiratory-system compliance decreases 28-day mortality of patients with moderate to severe ARDS compared with a conventional low-PEEP strategy. DESIGN, SETTING, AND PARTICIPANTS Multicenter, randomized trial conducted at 120 intensive care units (ICUs) from 9 countries from November 17, 2011, through April 25, 2017, enrolling adults with moderate to severe ARDS. INTERVENTIONS An experimental strategy with a lung recruitment maneuver and PEEP titration according to the best respiratory-system compliance (n = 501; experimental group) or a control strategy of low PEEP (n = 509). All patients received volume-assist control mode until weaning. MAIN OUTCOMES AND MEASURES The primary outcome was all-cause mortality until 28 days. Secondary outcomes were length of ICU and hospital stay; ventilator-free days through day 28; pneumothorax requiring drainage within 7 days; barotrauma within 7 days; and ICU, in-hospital, and 6-month mortality. RESULTS A total of 1010 patients (37.5% female; mean [SD] age, 50.9 [17.4] years) were enrolled and followed up. At 28 days, 277 of 501 patients (55.3%) in the experimental group and 251 of 509 patients (49.3%) in the control group had died (hazard ratio [HR], 1.20; 95% CI, 1.01 to 1.42; P = .041). Compared with the control group, the experimental group strategy increased 6-month mortality (65.3% vs 59.9%; HR, 1.18; 95% CI, 1.01 to 1.38; P = .04), decreased the number of mean ventilator-free days (5.3 vs 6.4; difference, -1.1; 95% CI, -2.1 to -0.1; P = .03), increased the risk of pneumothorax requiring drainage (3.2% vs 1.2%; difference, 2.0%; 95% CI, 0.0% to 4.0%; P = .03), and the risk of barotrauma (5.6% vs 1.6%; difference, 4.0%; 95% CI, 1.5% to 6.5%; P = .001). There were no significant differences in the length of ICU stay, length of hospital stay, ICU mortality, and in-hospital mortality. CONCLUSIONS AND RELEVANCE In patients with moderate to severe ARDS, a strategy with lung recruitment and titrated PEEP compared with low PEEP increased 28-day all-cause mortality. These findings do not support the routine use of lung recruitment maneuver and PEEP titration in these patients. TRIAL REGISTRATION clinicaltrials.gov Identifier: NCT01374022.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | - Flavia Ribeiro Machado
- Anesthesiology, Pain, and Intensive Care Department, Federal University of São Paulo-UNIFESP, São Paulo, Brazil
| | | | | | | | | | | | | | | | - Mirna Matsui
- Hospital Universitário da Universidade Federal da Grande Dourados, Dourados, Brazil
| | | | | | | | | | | | | | - Wojciech Szczeklik
- Jagiellonian University Medical College; Department of Intensive Care and Perioperative Medicine, Krakow, Poland
| | - Fernando Rios
- Hospital Nacional Alejandro Posadas, Moron, Argentina
| | - Marcelo Britto Passos Amato
- Cardio-Pulmonary Department, Pulmonary Division, Heart Institute (Incor), University of São Paulo, São Paulo, Brazil
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14
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Bugedo G, Retamal J, Bruhn A. Does the use of high PEEP levels prevent ventilator-induced lung injury? Rev Bras Ter Intensiva 2017; 29:231-237. [PMID: 28977263 PMCID: PMC5496758 DOI: 10.5935/0103-507x.20170032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 09/13/2016] [Indexed: 12/26/2022] Open
Abstract
Overdistention and intratidal alveolar recruitment have been advocated as the
main physical mechanisms responsible for ventilator-induced lung injury.
Limiting tidal volume has a demonstrated survival benefit in patients with acute
respiratory distress syndrome and is recognized as the cornerstone of protective
ventilation. In contrast, the use of high positive end-expiratory pressure
levels in clinical trials has yielded conflicting results and remains
controversial. In the present review, we will discuss the benefits and
limitations of the open lung approach and will discuss some recent experimental
and clinical trials on the use of high versus low/moderate positive
end-expiratory pressure levels. We will also distinguish dynamic (tidal volume)
from static strain (positive end-expiratory pressure and mean airway pressure)
and will discuss their roles in inducing ventilator-induced lung injury. High
positive end-expiratory pressure strategies clearly decrease refractory
hypoxemia in patients with acute respiratory distress syndrome, but they also
increase static strain, which in turn may harm patients, especially those with
lower levels of lung recruitability. In patients with severe respiratory
failure, titrating positive end-expiratory pressure against the severity of
hypoxemia, or providing it in a decremental fashion after a recruitment
maneuver, is recommended. If high plateau, driving or mean airway pressures are
observed, prone positioning or ultraprotective ventilation may be indicated to
improve oxygenation without additional stress and strain in the lung.
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Affiliation(s)
- Guillermo Bugedo
- Departamento de Medicina Intensiva, Pontificia Universidad Catolica de Chile - Santiago, Chile
| | - Jaime Retamal
- Departamento de Medicina Intensiva, Pontificia Universidad Catolica de Chile - Santiago, Chile
| | - Alejandro Bruhn
- Departamento de Medicina Intensiva, Pontificia Universidad Catolica de Chile - Santiago, Chile
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15
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Cyclic PaO 2 oscillations assessed in the renal microcirculation: correlation with tidal volume in a porcine model of lung lavage. BMC Anesthesiol 2017; 17:92. [PMID: 28693425 PMCID: PMC5504855 DOI: 10.1186/s12871-017-0382-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 06/30/2017] [Indexed: 01/08/2023] Open
Abstract
Background Oscillations of the arterial partial pressure of oxygen induced by varying shunt fractions occur during cyclic alveolar recruitment within the injured lung. Recently, these were proposed as a pathomechanism that may be relevant for remote organ injury following acute respiratory distress syndrome. This study examines the transmission of oxygen oscillations to the renal tissue and their tidal volume dependency. Methods Lung injury was induced by repetitive bronchoalveolar lavage in eight anaesthetized pigs. Cyclic alveolar recruitment was provoked by high tidal volume ventilation. Oscillations of the arterial partial pressure of oxygen were measured in real-time in the macrocirculation by multi-frequency phase fluorimetry and in the renal microcirculation by combined white-light spectrometry and laser-Doppler flowmetry during tidal volume down-titration. Results Significant respiratory-dependent oxygen oscillations were detected in the macrocirculation and transmitted to the renal microcirculation in a substantial extent. The amplitudes of these oscillations significantly correlate to the applied tidal volume and are minimized during down-titration. Conclusions In a porcine model oscillations of the arterial partial pressure of oxygen are induced by cyclic alveolar recruitment and transmitted to the renal microcirculation in a tidal volume-dependent fashion. They might play a role in organ crosstalk and remote organ damage following lung injury.
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16
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Kamuf J, Garcia-Bardon A, Duenges B, Liu T, Jahn-Eimermacher A, Heid F, David M, Hartmann EK. Endexpiratory lung volume measurement correlates with the ventilation/perfusion mismatch in lung injured pigs. Respir Res 2017; 18:101. [PMID: 28535788 PMCID: PMC5442669 DOI: 10.1186/s12931-017-0585-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 05/15/2017] [Indexed: 12/30/2022] Open
Abstract
Background In acute respiratory respiratory distress syndrome (ARDS) a sustained mismatch of alveolar ventilation and perfusion (VA/Q) impairs the pulmonary gas exchange. Measurement of endexpiratory lung volume (EELV) by multiple breath-nitrogen washout/washin is a non-invasive, bedside technology to assess pulmonary function in mechanically ventilated patients. The present study examines the association between EELV changes and VA/Q distribution and the possibility to predict VA/Q normalization by means of EELV in a porcine model. Methods After approval of the state and institutional animal care committee 12 anesthetized pigs were randomized to ARDS either by bronchoalveolar lavage (n = 6) or oleic acid injection (n = 6). EELV, VA/Q ratios by multiple inert gas elimination and ventilation distribution by electrical impedance tomography were assessed at healthy state and at five different positive endexpiratory pressure (PEEP) steps in ARDS (0, 20, 15, 10, 5 cmH2O; each maintained for 30 min). Results VA/Q, EELV and tidal volume distribution all displayed the PEEP-induced recruitment in ARDS. We found a close correlation between VA/Q < 0.1 (representing shunt and low VA/Q units) and changes in EELV (spearman correlation coefficient −0.79). Logistic regression reveals the potential to predict VA/Q normalization (VA/Q < 0.1 less than 5%) from changes in EELV with an area under the curve of 0.89 with a 95%-CI of 0.81–0.96 in the receiver operating characteristic. Different lung injury models and recruitment characteristics did not influence these findings. Conclusion In a porcine ARDS model EELV measurement depicts PEEP-induced lung recruitment and is strongly associated with normalization of the VA/Q distribution in a model-independent fashion. Determination of EELV could be an intriguing addition in the context of lung protection strategies.
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Affiliation(s)
- Jens Kamuf
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Langenbeckstr. 1, 55131, Mainz, Germany.
| | - Andreas Garcia-Bardon
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Langenbeckstr. 1, 55131, Mainz, Germany
| | - Bastian Duenges
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Langenbeckstr. 1, 55131, Mainz, Germany
| | - Tanghua Liu
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Langenbeckstr. 1, 55131, Mainz, Germany
| | - Antje Jahn-Eimermacher
- Institute of Medical Biostatistics, Epidemiology and Informatics, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
| | - Florian Heid
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Langenbeckstr. 1, 55131, Mainz, Germany
| | - Matthias David
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Langenbeckstr. 1, 55131, Mainz, Germany
| | - Erik K Hartmann
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Langenbeckstr. 1, 55131, Mainz, Germany
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17
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Serpa Neto A, Filho RR, Cherpanath T, Determann R, Dongelmans DA, Paulus F, Tuinman PR, Pelosi P, de Abreu MG, Schultz MJ. Associations between positive end-expiratory pressure and outcome of patients without ARDS at onset of ventilation: a systematic review and meta-analysis of randomized controlled trials. Ann Intensive Care 2016; 6:109. [PMID: 27813023 PMCID: PMC5095097 DOI: 10.1186/s13613-016-0208-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Accepted: 10/19/2016] [Indexed: 12/17/2022] Open
Abstract
Background The aim of this investigation was to compare ventilation at different levels of positive end-expiratory pressure (PEEP) with regard to clinical important outcomes of intensive care unit (ICU) patients without acute respiratory distress syndrome (ARDS) at onset of ventilation. Methods Meta-analysis of randomized controlled trials (RCTs) comparing a lower level of PEEP with a higher level of PEEP was performed. The primary outcome was in-hospital mortality. Results Twenty-one RCTs (1393 patients) were eligible. PEEP ranged from 0 to 10 cmH2O and from 5 to 30 cmH2O in the lower PEEP and the higher PEEP arms of included RCTs, respectively. In-hospital mortality was not different between the two PEEP arms in seven RCTs (risk ratio [RR] 0.87; 95% confidence interval [CI] 0.62–1.21; I2 = 26%, low quality of evidence [QoE]), as was duration of mechanical ventilation in three RCTs (standardized mean difference [SMD] 0.68; 95% CI −0.24 to 1.61; I2 = 82%, very low QoE). PaO2/FiO2 was higher in the higher PEEP arms in five RCTs (SMD 0.72; 95% CI 0.10–1.35; I2 = 86%, very low QoE). Development of ARDS and the occurrence of hypoxemia (2 RCTs) were lower in the higher PEEP arms in four RCTs and two RCTs, respectively (RR 0.43; 95% CI 0.21–0.91; I2 = 56%, low QoE; RR 0.42; 95%–CI 0.19–0.92; I2 = 19%, low QoE). There was no association between the level of PEEP and any hemodynamic parameter (four RCTs). Conclusion Ventilation with higher levels of PEEP in ICU patients without ARDS at onset of ventilation was not associated with lower in-hospital mortality or shorter duration of ventilation, but with a lower incidence of ARDS and hypoxemia, as well as higher PaO2/FiO2. These findings should be interpreted with caution, as heterogeneity was moderate to high, the QoE was low to very low, and the available studies prevented us from addressing the effects of moderate levels of PEEP. Electronic supplementary material The online version of this article (doi:10.1186/s13613-016-0208-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ary Serpa Neto
- Department of Critical Care Medicine, Hospital Israelita Albert Einstein, São Paulo, Brazil. .,Department of Intensive Care, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
| | - Roberto Rabello Filho
- Department of Critical Care Medicine, Hospital Israelita Albert Einstein, São Paulo, Brazil
| | - Thomas Cherpanath
- Department of Intensive Care, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Rogier Determann
- Department of Critical Care, Westfriesgasthuis, Hoorn, The Netherlands
| | - Dave A Dongelmans
- Department of Intensive Care, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,National Intensive Care Evaluation, Amsterdam, The Netherlands
| | - Frederique Paulus
- Department of Intensive Care, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Pieter Roel Tuinman
- Department of Intensive Care & REVIVE Research VUmc Intensive Care, Free University Medical Center, Amsterdam, The Netherlands
| | - Paolo Pelosi
- Department of Surgical Sciences and Integrated Diagnostics, IRCCS AOU San Martino IST, University of Genoa, Genoa, Italy
| | - Marcelo Gama de Abreu
- Department of Anesthesiology and Intensive Care Medicine, Pulmonary Engineering Groups, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Marcus J Schultz
- Department of Intensive Care, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,Laboratory of Experimental Intensive Care and Anesthesiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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18
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Neto AS, Barbas CSV, Simonis FD, Artigas-Raventós A, Canet J, Determann RM, Anstey J, Hedenstierna G, Hemmes SNT, Hermans G, Hiesmayr M, Hollmann MW, Jaber S, Martin-Loeches I, Mills GH, Pearse RM, Putensen C, Schmid W, Severgnini P, Smith R, Treschan TA, Tschernko EM, Melo MFV, Wrigge H, de Abreu MG, Pelosi P, Schultz MJ. Epidemiological characteristics, practice of ventilation, and clinical outcome in patients at risk of acute respiratory distress syndrome in intensive care units from 16 countries (PRoVENT): an international, multicentre, prospective study. THE LANCET RESPIRATORY MEDICINE 2016; 4:882-893. [PMID: 27717861 DOI: 10.1016/s2213-2600(16)30305-8] [Citation(s) in RCA: 110] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 08/02/2016] [Accepted: 08/04/2016] [Indexed: 01/06/2023]
Abstract
BACKGROUND Scant information exists about the epidemiological characteristics and outcome of patients in the intensive care unit (ICU) at risk of acute respiratory distress syndrome (ARDS) and how ventilation is managed in these individuals. We aimed to establish the epidemiological characteristics of patients at risk of ARDS, describe ventilation management in this population, and assess outcomes compared with people at no risk of ARDS. METHODS PRoVENT (PRactice of VENTilation in critically ill patients without ARDS at onset of ventilation) is an international, multicentre, prospective study undertaken at 119 ICUs in 16 countries worldwide. All patients aged 18 years or older who were receiving mechanical ventilation in participating ICUs during a 1-week period between January, 2014, and January, 2015, were enrolled into the study. The Lung Injury Prediction Score (LIPS) was used to stratify risk of ARDS, with a score of 4 or higher defining those at risk of ARDS. The primary outcome was the proportion of patients at risk of ARDS. Secondary outcomes included ventilatory management (including tidal volume [VT] expressed as mL/kg predicted bodyweight [PBW], and positive end-expiratory pressure [PEEP] expressed as cm H2O), development of pulmonary complications, and clinical outcomes. The PRoVENT study is registered at ClinicalTrials.gov, NCT01868321. The study has been completed. FINDINGS Of 3023 patients screened for the study, 935 individuals fulfilled the inclusion criteria. Of these critically ill patients, 282 were at risk of ARDS (30%, 95% CI 27-33), representing 0·14 cases per ICU bed over a 1-week period. VT was similar for patients at risk and not at risk of ARDS (median 7·6 mL/kg PBW [IQR 6·7-9·1] vs 7·9 mL/kg PBW [6·8-9·1]; p=0·346). PEEP was higher in patients at risk of ARDS compared with those not at risk (median 6·0 cm H2O [IQR 5·0-8·0] vs 5·0 cm H2O [5·0-7·0]; p<0·0001). The prevalence of ARDS in patients at risk of ARDS was higher than in individuals not at risk of ARDS (19/260 [7%] vs 17/556 [3%]; p=0·004). Compared with individuals not at risk of ARDS, patients at risk of ARDS had higher in-hospital mortality (86/543 [16%] vs 74/232 [32%]; p<0·0001), ICU mortality (62/533 [12%] vs 66/227 [29%]; p<0·0001), and 90-day mortality (109/653 [17%] vs 88/282 [31%]; p<0·0001). VT did not differ between patients who did and did not develop ARDS (p=0·471 for those at risk of ARDS; p=0·323 for those not at risk). INTERPRETATION Around a third of patients receiving mechanical ventilation in the ICU were at risk of ARDS. Pulmonary complications occur frequently in patients at risk of ARDS and their clinical outcome is worse compared with those not at risk of ARDS. There is potential for improvement in the management of patients without ARDS. Further refinements are needed for prediction of ARDS. FUNDING None.
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Affiliation(s)
- Ary Serpa Neto
- Department of Intensive Care and Laboratory of Experimental Intensive Care and Anesthesiology (LEICA), Academic Medical Center, Amsterdam, Netherlands; Department of Intensive Care Medicine, Hospital Israelita Albert Einstein, São Paulo, Brazil.
| | - Carmen S V Barbas
- Department of Intensive Care Medicine, Hospital Israelita Albert Einstein, São Paulo, Brazil; Department of Pulmonology, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Fabienne D Simonis
- Department of Intensive Care and Laboratory of Experimental Intensive Care and Anesthesiology (LEICA), Academic Medical Center, Amsterdam, Netherlands
| | - Antonio Artigas-Raventós
- Department of Intensive Care Medicine, Hospital de Sabadell, CIBER de Enfermedades Respiratorias, Corporació Sanitaria I Universitària Parc Taulí, Sabadell, Spain
| | - Jaume Canet
- Department of Anesthesiology, Hospital Universitari Germans Trias I Pujol, Barcelona, Spain
| | | | - James Anstey
- Department of Intensive Care, St Vincent's Hospital, Melbourne, VIC, Australia
| | | | - Sabrine N T Hemmes
- Department of Anesthesiology, Academic Medical Center, Amsterdam, Netherlands
| | - Greet Hermans
- Medical Intensive Care Unit, Division of General Internal Medicine, University Hospital Leuven, Leuven, Belgium; Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Michael Hiesmayr
- Division of Cardiac, Thoracic, and Vascular Anesthesia and Intensive Care, Medical University Vienna, Vienna, Austria
| | - Markus W Hollmann
- Department of Anesthesiology, Academic Medical Center, Amsterdam, Netherlands
| | - Samir Jaber
- Department of Critical Care Medicine and Anesthesiology (SAR B), Saint Eloi University Hospital, Montpellier, France
| | - Ignacio Martin-Loeches
- Department of Clinical Medicine, St James's Hospital, Multidisciplinary Intensive Care Research Organization (MICRO), Trinity Centre for Health Sciences, Dublin, Ireland
| | - Gary H Mills
- Department of Anaesthesia and Critical Care Medicine, Sheffield Teaching Hospital, Sheffield, UK
| | - Rupert M Pearse
- Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Christian Putensen
- Department of Anesthesiology and Intensive Care Medicine, University Hospital Bonn, Bonn, Germany
| | - Werner Schmid
- Division of Cardiac, Thoracic, and Vascular Anesthesia and Intensive Care, Medical University Vienna, Vienna, Austria
| | - Paolo Severgnini
- Department of Biotechnologies and Sciences of Life, Insubria University, Varese, Italy
| | - Roger Smith
- Department of Intensive Care, St Vincent's Hospital, Melbourne, VIC, Australia
| | - Tanja A Treschan
- Department of Anaesthesiology, Düsseldorf University Hospital, Düsseldorf, Germany
| | - Edda M Tschernko
- Division of Cardiac, Thoracic, and Vascular Anesthesia and Intensive Care, Medical University Vienna, Vienna, Austria
| | - Marcos F V Melo
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Hermann Wrigge
- Department of Anesthesiology and Intensive Care Medicine, University of Leipzig, Leipzig, Germany
| | - Marcelo Gama de Abreu
- Pulmonary Engineering Group, Department of Anesthesiology and Intensive Care Medicine, University Hospital Carl Gustav Carus, and Technische Universität Dresden, Dresden, Germany
| | - Paolo Pelosi
- Department of Surgical Sciences and Integrated Diagnostics, IRCCS San Martino IST, University of Genoa, Genoa, Italy
| | - Marcus J Schultz
- Department of Intensive Care and Laboratory of Experimental Intensive Care and Anesthesiology (LEICA), Academic Medical Center, Amsterdam, Netherlands
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Zhou J, Han Y. Pleth variability index and respiratory system compliance to direct PEEP settings in mechanically ventilated patients, an exploratory study. SPRINGERPLUS 2016; 5:1371. [PMID: 27606159 PMCID: PMC4992479 DOI: 10.1186/s40064-016-3008-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Accepted: 08/05/2016] [Indexed: 11/10/2022]
Abstract
OBJECTIVES To analyze the ability of pleth variability index (PVI) and respiratory system compliance (RSC) on evaluating the hemodynamic and respiratory effects of positive end expiratory pressure (PEEP), then to direct PEEP settings in mechanically ventilated critical patients. METHODS We studied 22 mechanically ventilated critical patients in the intensive care unit. Patients were monitored with classical monitor and a pulse co-oximeter, with pulse sensors attached to patients' index fingers. Hemodynamic data [heart rate (HR), perfusion index (PI), PVI, central venous pressure (CVP), mean arterial pressure (MAP), peripheral blood oxygen saturation (SPO2), peripheral blood oxygen content (SPOC) and peripheral blood hemoglobin (SPHB)] as well as the respiratory data [respiratory rate (RR), tidal volume (VT), RSC and controlled airway pressure] were recorded for 15 min each at 3 different levels of PEEP (0, 5 and 10 cmH2O). RESULTS Different levels of PEEP (0, 5 and 10 cmH2O) had no obvious effect on RR, HR, MAP, SPO2 and SPOC. However, 10 cmH2O PEEP induced significant hemodynamic disturbances, including decreases of PI, and increases of both PVI and CVP. Meanwhile, 5 cmH2O PEEP induced no significant changes on hemodynamics such as CVP, PI and PVI, but improved the RSC. CONCLUSIONS RSC and PVI may be useful in detecting the hemodynamic and respiratory effects of PEEP, thus may help clinicians individualize PEEP settings in mechanically ventilated patients.
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Affiliation(s)
- Jing Zhou
- Intensive Care Unit, Department of Geriatrics, Jiangsu Province Hospital, 300 Guangzhou Road, Nanjing, 210029 China
| | - Yi Han
- Intensive Care Unit, Department of Geriatrics, Jiangsu Province Hospital, 300 Guangzhou Road, Nanjing, 210029 China
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Bedside assessment of the effects of positive end-expiratory pressure on lung inflation and recruitment by the helium dilution technique and electrical impedance tomography. Intensive Care Med 2016; 42:1576-1587. [DOI: 10.1007/s00134-016-4467-4] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 07/28/2016] [Indexed: 11/26/2022]
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