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Sud S, Fan E, Adhikari NKJ, Friedrich JO, Ferguson ND, Combes A, Guerin C, Guyatt G. Comparison of venovenous extracorporeal membrane oxygenation, prone position and supine mechanical ventilation for severely hypoxemic acute respiratory distress syndrome: a network meta-analysis. Intensive Care Med 2024; 50:1021-1034. [PMID: 38842731 DOI: 10.1007/s00134-024-07492-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Accepted: 05/13/2024] [Indexed: 06/07/2024]
Abstract
PURPOSE Severe acute respiratory distress syndrome (ARDS) with PaO2/FiO2 < 80 mmHg is a life-threatening condition. The optimal management strategy is unclear. The aim of this meta-analysis was to compare the effects of low tidal volumes (Vt), moderate Vt, prone ventilation, and venovenous extracorporeal membrane oxygenation (VV-ECMO) on mortality in severe ARDS. METHODS We performed a frequentist network meta-analysis of randomised controlled trials (RCTs) with participants who had severe ARDS and met eligibility criteria for VV-ECMO or had PaO2/FiO2 < 80 mmHg. We applied the Grades of Recommendation, Assessment, Development, and Evaluation (GRADE) methodology to discern the relative effect of interventions on mortality and the certainty of the evidence. RESULTS Ten RCTs including 812 participants with severe ARDS were eligible. VV-ECMO reduces mortality compared to low Vt (risk ratio [RR] 0.77, 95% confidence interval [CI] 0.59-0.99, moderate certainty) and compared to moderate Vt (RR 0.75, 95% CI 0.57-0.98, low certainty). Prone ventilation reduces mortality compared to moderate Vt (RR 0.78, 95% CI 0.66-0.93, high certainty) and compared to low Vt (RR 0.81, 95% CI 0.63-1.02, moderate certainty). We found no difference in the network comparison of VV-ECMO compared to prone ventilation (RR 0.95, 95% CI 0.72-1.26), but inferences were based solely on indirect comparisons with very low certainty due to very wide confidence intervals. CONCLUSIONS In adults with ARDS and severe hypoxia, both VV-ECMO (low to moderate certainty evidence) and prone ventilation (moderate to high certainty evidence) improve mortality relative to low and moderate Vt strategies. The impact of VV-ECMO versus prone ventilation remains uncertain.
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Affiliation(s)
- Sachin Sud
- Division of Critical Care, Department of Medicine, Trillium Health Center, University of Toronto, 100 Queensway West, Mississauga, ON, L5B 1B8, Canada.
- Institute of Better Health, Trillium Health Partners, Mississauga, Canada.
| | - 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
| | - Neill K J Adhikari
- 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 Critical Care Medicine, Sunnybrook Health Sciences Centre, Toronto, Canada
| | - Jan O Friedrich
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
| | - Niall D Ferguson
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Canada
| | - Alain Combes
- Service de Médecine Intensive-Réanimation, Institut de Cardiologie, APHP Hôpital Pitié-Salpêtrière, 75013, Paris, France
- Sorbonne Université, INSERM, UMRS_1166-ICAN, Institute of Cardiometabolism and Nutrition, 75013, Paris, France
| | - Claude Guerin
- Service de Médecine Intensive-Réanimation, Hôpital Edouard Herriot, Université de Lyon, Lyon, France
| | - Gordon Guyatt
- Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, Canada
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Al-Ayed T, Alsarhi IB, Alturki A, Aljofan F, Alofisan T, Abdulsalam MA, Gashgarey D, Alrwili R, Aldihan W, Mahfodh SBB, Alanzi F, Al-Wathinani AM, Alhuthil RT. The outcome of high-frequency oscillatory ventilation in pediatric patients with acute respiratory distress syndrome in an intensive care unit. Ann Saudi Med 2023; 43:283-290. [PMID: 37805817 PMCID: PMC10560370 DOI: 10.5144/0256-4947.2023.283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Accepted: 08/26/2023] [Indexed: 10/09/2023] Open
Abstract
BACKGROUND In adults with acute respiratory distress syndrome (ARDS), high-frequency oscillatory ventilation (HFOV) has been associated with higher mortality rates. Therefore, its use in children with ARDS is still controversial. OBJECTIVES Evaluate the overall mortality of HFOV in children with ARDS and explore mortality-related risk factors; compare the outcome of using HFOV post-endotracheal intubation early (≤24 hours) versus late (≤24 hours). DESIGN Retrospective (medical record review) SETTING: Pediatric intensive care unit in a tertiary care center in Saudi Arabia. PATIENTS AND METHODS Data were collected from medical records of all pediatric patients with ARDS aged one week to 14 years, who were admitted to the pediatric intensive care unit (PICU) from January 2016-June 2019 and who required HFOV. MAIN OUTCOME MEASURES PICU mortality. SAMPLE SIZE AND CHARACTERISTICS 135 ARDS patients including 74 females (54.8%), and 61 males (45.2%), with a median age (interquar-tile range) of 35 (72) months. RESULTS The overall mortality rate was 60.0% (81/135), and most died in the first 28 days in the PICU (91.3%, 74/8). Of non-survivors, 75.3% (61/81) were immunocompromised, and 24.7% (20/81) were immuno-competent patients, 52 (64.2%) received inotropic support, 40 (49.4%) had a bone-marrow transplant (BMT) before HFOV initiation. Although the prone position was used in 20.7% (28/135) to improve the survival rate post-HFOV ventilation, only 28.6% (8/28) survived. In addition, altered code status or chemotherapy reported a significant association with mortality (P<.05). Interestingly, early HFOV initiation (≤24 hours) did not seem to have a high impact on survival compared to late initiation (>24 hours); (57.4% vs. 42.6%, P=.721). CONCLUSION Immunocompromised and oncology patients, including post-BMT, reported poorer outcomes, and neither the prone position nor early use of HFOV improved outcomes. However, it is recommended to replicate the study in a larger cohort to generalize the results. LIMITATIONS Retrospective single-center study.
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Affiliation(s)
- Tareq Al-Ayed
- From the Critical Care Medicine Department, Pediatric Intensive Care Unit, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Iyad B. Alsarhi
- From the Pediatric Intensive Care Unit, International Medical Center, Jeddah, Saudi Arabia
| | - Abdullah Alturki
- From the Critical Care Medicine Department, Pediatric Intensive Care Unit, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Fahad Aljofan
- From the Critical Care Medicine Department, Pediatric Intensive Care Unit, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Tariq Alofisan
- From the Critical Care Medicine Department, Pediatric Intensive Care Unit, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Moath Al Abdulsalam
- From the Critical Care Medicine Department, Pediatric Intensive Care Unit, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Deema Gashgarey
- From the Department of Pediatrics, King Faisal Specialist Hospital and Research Center, Riyadh
| | - Rwan Alrwili
- From the Department of Pediatrics, King Faisal Specialist Hospital and Research Center, Riyadh
| | - Wala Aldihan
- From the Department of Pediatrics, King Faisal Specialist Hospital and Research Center, Riyadh
| | - Saleh Badr Bin Mahfodh
- From the Pediatric Intensive Care Unit, International Medical Center, Jeddah, Saudi Arabia
| | - Fawaz Alanzi
- From the Department of Pediatrics, King Faisal Specialist Hospital and Research Center, Riyadh
| | | | - Raghad Tariq Alhuthil
- From the Department of Pediatrics, King Faisal Specialist Hospital and Research Center, Riyadh
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3
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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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Miller AG, Bartle RM, Feldman A, Mallory P, Reyes E, Scott B, Rotta AT. A narrative review of advanced ventilator modes in the pediatric intensive care unit. Transl Pediatr 2021; 10:2700-2719. [PMID: 34765495 PMCID: PMC8578787 DOI: 10.21037/tp-20-332] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 11/26/2020] [Indexed: 01/29/2023] Open
Abstract
Respiratory failure is a common reason for pediatric intensive care unit admission. The vast majority of children requiring mechanical ventilation can be supported with conventional mechanical ventilation (CMV) but certain cases with refractory hypoxemia or hypercapnia may require more advanced modes of ventilation. This paper discusses what we have learned about the use of advanced ventilator modes [e.g., high-frequency oscillatory ventilation (HFOV), high-frequency percussive ventilation (HFPV), high-frequency jet ventilation (HFJV) airway pressure release ventilation (APRV), and neurally adjusted ventilatory assist (NAVA)] from clinical, animal, and bench studies. The evidence supporting advanced ventilator modes is weak and consists of largely of single center case series, although a few RCTs have been performed. Animal and bench models illustrate the complexities of different modes and the challenges of applying these clinically. Some modes are proprietary to certain ventilators, are expensive, or may only be available at well-resourced centers. Future efforts should include large, multicenter observational, interventional, or adaptive design trials of different rescue modes (e.g., PROSpect trial), evaluate their use during ECMO, and should incorporate assessments through volumetric capnography, electric impedance tomography, and transpulmonary pressure measurements, along with precise reporting of ventilator parameters and physiologic variables.
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Affiliation(s)
- Andrew G Miller
- Duke University Medical Center, Durham, NC, USA.,Respiratory Care Services, Duke University Medical Center, Durham, NC, USA
| | - Renee M Bartle
- Duke University Medical Center, Durham, NC, USA.,Respiratory Care Services, Duke University Medical Center, Durham, NC, USA
| | - Alexandra Feldman
- Duke University Medical Center, Durham, NC, USA.,Division of Pediatric Critical Care Medicine, Duke University Medical Center, Durham, NC, USA
| | - Palen Mallory
- Duke University Medical Center, Durham, NC, USA.,Division of Pediatric Critical Care Medicine, Duke University Medical Center, Durham, NC, USA
| | - Edith Reyes
- Duke University Medical Center, Durham, NC, USA.,Division of Pediatric Critical Care Medicine, Duke University Medical Center, Durham, NC, USA
| | - Briana Scott
- Duke University Medical Center, Durham, NC, USA.,Division of Pediatric Critical Care Medicine, Duke University Medical Center, Durham, NC, USA
| | - Alexandre T Rotta
- Duke University Medical Center, Durham, NC, USA.,Division of Pediatric Critical Care Medicine, Duke University Medical Center, Durham, NC, USA
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5
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Rahayatri TH, Amaliah R, Putri NM, Puspaningtyas NW, Karyanti MR, Hendarto A. Omphalopagus conjoined twins separation during coronavirus disease-19 pandemic era: A case report. Int J Surg Case Rep 2021; 84:106150. [PMID: 34221850 PMCID: PMC8240450 DOI: 10.1016/j.ijscr.2021.106150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/24/2021] [Accepted: 06/26/2021] [Indexed: 11/23/2022] Open
Abstract
Introduction and importance Conjoined twin is a rare congenital anomaly characterized by a fusion of certain anatomical structures. Coronavirus-19 (COVID-19) is a new emerging infectious respiratory disease affecting worldwide and potentially leads to acute respiratory distress (ARDS) in children. COVID-19 has reconstructed the healthcare system, including surgical care and decision-making. Case presentation Herein we describe a surgical separation of 2.5 months old omphalopagus conjoined twins, with one of them (Baby A) presenting COVID-19-associated respiratory distress, as well as the challenges faced during the preparation and the execution of the complex surgical procedure. Clinical discussion Baby A underwent antiviral therapy, oxygen supplementation, and ventilation in the ICU, while baby B remained stable and confirmed negative for SARS-CoV-2. The separation surgery was conducted after baby A had become clinically stable. Defect closure and reconstruction were accomplished. At one week follow-up, Baby A died of lung infection, while baby B remained well after one year. Conclusion The complexity of surgical separation requires careful planning by a multidisciplinary team. Surgical separation of conjoined twins during the pandemic era has not been reported much in the literature, more reports are required to provide further insight. Omphalopagus conjoined twins separation surgery is an intricate procedure that requires a multidisciplinary team The separation surgery of conjoined twins during the COVID-19 pandemic necessitate a unique surgical preparation and disciplined health protocols. The ideal timing of separation surgery of conjoined twins in the COVID-19 pandemic era remains controversial, factors that may play a role in the decision making include the age, weight, general clinical condition, and the complexity of fusion identified
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Key Words
- ARDS, acute respiratory distress syndrome
- CDC, Centers for Disease Control and Prevention
- COVID-19
- COVID-19, coronavirus disease-19
- CPAP, continuous positive airway pressure
- CT-scan, computed tomography-scan
- CUSA, cavitron ultrasonic surgical aspirator
- Case report
- Children
- Conjoined twins separation
- ECMO, extracorporeal membrane oxygenation
- HCP, healthcare providers
- HFN, high flow nasal
- HFOV, high-frequency oscillation ventilation
- ICU, intensive care unit
- IVC, inferior vena cava
- MRI, magnetic resonance imaging
- MRSA, methicillin-resistant Staphylococcus aureus
- NPWT, negative pressure wound therapy
- ORC, oxidized regenerated cellulose
- Omphalopagus conjoined twins
- PCR, polymerase chain reaction
- PDA, patent ductus arteriosus
- PDS, polydioxanone suture
- PICU, pediatric intensive care unit
- POD, post-operative day
- PPE, personal protective equipment
- SCARE, surgical case report
- WHO, World Health Organization
- cm, centimeter
- lpm, litres per minute
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Affiliation(s)
- Tri Hening Rahayatri
- Faculty of Medicine, Universitas Indonesia, Pediatric Surgery Division, Department of Surgery, Dr. Cipto Mangunkusumo Hospital, Jakarta, Indonesia.
| | - Rizky Amaliah
- Faculty of Medicine, Universitas Indonesia, Pediatric Surgery Division, Department of Surgery, Dr. Cipto Mangunkusumo Hospital, Jakarta, Indonesia
| | - Nandita Melati Putri
- Faculty of Medicine, Universitas Indonesia, Plastic Surgery Division, Department of Surgery, Dr. Cipto Mangunkusumo Hospital, Jakarta, Indonesia
| | - Niken Wahyu Puspaningtyas
- Faculty of Medicine, Universitas Indonesia, Pediatric Intensive Care Division, Department of Child Health, Dr. Cipto Mangunkusumo Hospital, Jakarta, Indonesia
| | - Mulya Rahma Karyanti
- Faculty of Medicine, Universitas Indonesia, Pediatric Infectious and Tropical Disease Division, Department of Child Health,Dr. Cipto Mangunkusumo Hospital, Jakarta, Indonesia
| | - Aryono Hendarto
- Faculty of Medicine, Universitas Indonesia, Pediatric Nutrition and Metabolic Disease Division, Department of Child Health, Dr. Cipto Mangunkusumo Hospital, Jakarta, Indonesia
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6
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Hon KL, Leung KKY, Oberender F, Leung AK. Paediatrics: how to manage acute respiratory distress syndrome. Drugs Context 2021; 10:dic-2021-1-9. [PMID: 34122589 PMCID: PMC8177958 DOI: 10.7573/dic.2021-1-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 03/17/2021] [Indexed: 12/13/2022] Open
Abstract
Background Acute respiratory distress syndrome (ARDS) is a significant cause of mortality and morbidity amongst critically ill children. The purpose of this narrative review is to provide an up-to-date review on the evaluation and management of paediatric ARDS (PARDS). Methods A PubMed search was performed with Clinical Queries using the key term "acute respiratory distress syndrome". The search strategy included clinical trials, meta-analyses, randomized controlled trials, observational studies and reviews. Google, Wikipedia and UpToDate were also searched to enrich the review. The search was restricted to the English literature and children. Discussion Non-invasive positive pressure ventilation, lung-protective ventilation strategies, conservative fluid management and adequate nutritional support all have proven efficacy in the management of PARDS. The Pediatric Acute Lung Injury Consensus Conference recommends the use of corticosteroids, high-frequency oscillation ventilation and inhaled nitric oxide in selected scenarios. Partial liquid ventilation and surfactant are not considered efficacious based on evidence from clinical trials. Conclusion PARDS is a serious but relatively rare cause of admission into the paediatric intensive care unit and is associated with high mortality. Non-invasive positive pressure ventilation, lung-protective ventilation strategies, conservative fluid management and adequate nutrition are advocated. As there has been a lack of progress in the management of PARDS in recent years, further well-designed, large-scale, randomized controlled trials in this field are urgently needed.
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Affiliation(s)
- Kam Lun Hon
- Paediatric Intensive Care Unit, Department of Paediatrics and Adolescent Medicine, Hong Kong Children's Hospital, Hong Kong
| | - Karen Ka Yan Leung
- Paediatric Intensive Care Unit, Department of Paediatrics and Adolescent Medicine, Hong Kong Children's Hospital, Hong Kong
| | - Felix Oberender
- Paediatric Intensive Care Unit, Monash Children's Hospital, Melbourne, Australia.,Monash University, School of Clinical Sciences, Department of Paediatrics, Melbourne, Australia
| | - Alexander Kc Leung
- Department of Pediatrics, The University of Calgary and The Alberta Children's Hospital, Calgary, Alberta, Canada
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Tiruvoipati R, Gupta S, Pilcher D, Bailey M. Management of hypercapnia in critically ill mechanically ventilated patients-A narrative review of literature. J Intensive Care Soc 2020; 21:327-333. [PMID: 34093735 PMCID: PMC8142102 DOI: 10.1177/1751143720915666] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The use of lower tidal volume ventilation was shown to improve survival in mechanically ventilated patients with acute lung injury. In some patients this strategy may cause hypercapnic acidosis. A significant body of recent clinical data suggest that hypercapnic acidosis is associated with adverse clinical outcomes including increased hospital mortality. We aimed to review the available treatment options that may be used to manage acute hypercapnic acidosis that may be seen with low tidal volume ventilation. The databases of MEDLINE and EMBASE were searched. Studies including animals or tissues were excluded. We also searched bibliographic references of relevant studies, irrespective of study design with the intention of finding relevant studies to be included in this review. The possible options to treat hypercapnia included optimising the use of low tidal volume mechanical ventilation to enhance carbon dioxide elimination. These include techniques to reduce dead space ventilation, and physiological dead space, use of buffers, airway pressure release ventilation and prone positon ventilation. In patients where hypercapnic acidosis could not be managed with lung protective mechanical ventilation, extracorporeal techniques may be used. Newer, minimally invasive low volume venovenous extracorporeal devices are currently being investigated for managing hypercapnia associated with low and ultra-low volume mechanical ventilation.
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Affiliation(s)
- Ravindranath Tiruvoipati
- Department of Intensive Care Medicine, Frankston Hospital, Frankston, Australia
- Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Australia
- ANZIC-RC, Department of Epidemiology & Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, Australia
- Ravindranath Tiruvoipati, Department of Intensive Care Medicine, Frankston Hospital, Frankston, Victoria 3199, Australia.
| | - Sachin Gupta
- Department of Intensive Care Medicine, Frankston Hospital, Frankston, Australia
- Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Australia
| | - David Pilcher
- ANZIC-RC, Department of Epidemiology & Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, Australia
- The ANZICS Centre for Outcome and Resource Evaluation (ANZICS CORE), Melbourne, Australia
- Department of Intensive Care, The Alfred Hospital, Melbourne, Australia
| | - Michael Bailey
- ANZIC-RC, Department of Epidemiology & Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, Australia
- The ANZICS Centre for Outcome and Resource Evaluation (ANZICS CORE), Melbourne, Australia
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8
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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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Abstract
The COVID-19 outbreak has led to 80,409 diagnosed cases and 3,012 deaths in mainland China based on the data released on March 4, 2020. Approximately 3.2% of patients with COVID-19 required intubation and invasive ventilation at some point in the disease course. Providing best practices regarding intubation and ventilation for an overwhelming number of patients with COVID-19 amid an enhanced risk of cross-infection is a daunting undertaking. The authors presented the experience of caring for the critically ill patients with COVID-19 in Wuhan. It is extremely important to follow strict self-protection precautions. Timely, but not premature, intubation is crucial to counter a progressively enlarging oxygen debt despite high-flow oxygen therapy and bilevel positive airway pressure ventilation. Thorough preparation, satisfactory preoxygenation, modified rapid sequence induction, and rapid intubation using a video laryngoscope are widely used intubation strategies in Wuhan. Lung-protective ventilation, prone position ventilation, and adequate sedation and analgesia are essential components of ventilation management.
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10
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Meng L, Qiu H, Wan L, Ai Y, Xue Z, Guo Q, Deshpande R, Zhang L, Meng J, Tong C, Liu H, Xiong L. Intubation and Ventilation amid the COVID-19 Outbreak: Wuhan's Experience. Anesthesiology 2020; 132:1317-1332. [PMID: 32195705 PMCID: PMC7155908 DOI: 10.1097/aln.0000000000003296] [Citation(s) in RCA: 382] [Impact Index Per Article: 95.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 03/06/2020] [Indexed: 02/06/2023]
Abstract
The COVID-19 outbreak has led to 80,409 diagnosed cases and 3,012 deaths in mainland China based on the data released on March 4, 2020. Approximately 3.2% of patients with COVID-19 required intubation and invasive ventilation at some point in the disease course. Providing best practices regarding intubation and ventilation for an overwhelming number of patients with COVID-19 amid an enhanced risk of cross-infection is a daunting undertaking. The authors presented the experience of caring for the critically ill patients with COVID-19 in Wuhan. It is extremely important to follow strict self-protection precautions. Timely, but not premature, intubation is crucial to counter a progressively enlarging oxygen debt despite high-flow oxygen therapy and bilevel positive airway pressure ventilation. Thorough preparation, satisfactory preoxygenation, modified rapid sequence induction, and rapid intubation using a video laryngoscope are widely used intubation strategies in Wuhan. Lung-protective ventilation, prone position ventilation, and adequate sedation and analgesia are essential components of ventilation management.
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Affiliation(s)
- Lingzhong Meng
- From the Department of Anesthesiology, Yale University School of Medicine, New Haven, Connecticut (L.M., R.D.) the Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China (H.Q.) the Department of Anesthesiology, Tongji Hospital, Tongji Medical College Huazhong University of Science and Technology, Wuhan, Hubei, China (L.W.) the Departments of Critical Care Medicine (Y.A., L.Z.) Anesthesiology (Q.G.) Respiratory Medicine (J.M.), Xiangya Hospital, Central South University, Changsha, Hunan Province, China the Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China (Z.X.) the Department of Anesthesiology, Wake Forest University, Winston-Salem, North Carolina (C.T.) the Department of Anesthesiology and Pain Medicine, University of California Davis, Sacramento, California (H.L.) the Department of Anesthesiology and Perioperative Medicine, Shanghai Fourth People's Hospital, Tongji University School of Medicine, Shanghai, China (L.X.)
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11
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Jayashree M, Vishwa CR. HFOV in Pediatric ARDS: Viable or Vestigial? Indian J Pediatr 2020; 87:171-172. [PMID: 32026303 DOI: 10.1007/s12098-020-03215-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 01/24/2020] [Indexed: 10/25/2022]
Affiliation(s)
- Muralidharan Jayashree
- Division of Pediatric Critical Care, Advanced Pediatrics Centre, PGIMER, Chandigarh, India.
| | - C R Vishwa
- Division of Pediatric Critical Care, Advanced Pediatrics Centre, PGIMER, Chandigarh, India
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12
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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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Ganguly A, Makkar A, Sekar K. Volume Targeted Ventilation and High Frequency Ventilation as the Primary Modes of Respiratory Support for ELBW Babies: What Does the Evidence Say? Front Pediatr 2020; 8:27. [PMID: 32117833 PMCID: PMC7025474 DOI: 10.3389/fped.2020.00027] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 01/20/2020] [Indexed: 12/01/2022] Open
Abstract
Respiratory management of the extremely low birth weight (ELBW) newborn has evolved over time. Although non-invasive ventilation is being increasingly used for respiratory support in these ELBW infants, invasive ventilation still remains the primary mode in this population. Current ventilators are microprocessor driven and have revolutionized the respiratory support for these neonates synchronizing the baby's breath to ventilator breaths. High frequency ventilators with the delivery of tidal volumes less than the dead space have been introduced to minimize barotrauma and chronic lung disease. Despite these advances, the incidence of chronic lung disease has not decreased. There is still controversy regarding which mode is ideal as the primary mode of ventilation in ELBW infants. The most common modes seem to be pressure targeted conventional ventilation, volume targeted conventional ventilation and high frequency ventilation which includes high frequency oscillatory ventilation, high frequency jet ventilation and high frequency flow interrupter. In recent years, several randomized controlled trials and meta-analyses have compared volume vs. pressure targeted ventilation and high frequency ventilation. While volume targeted ventilation and high frequency ventilation does show promise, substantial practice variability among different centers persists. In this review, we weighed the evidence for each mode and evaluated which modes show promise as the primary support of ventilation in ELBW babies.
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Affiliation(s)
- Abhrajit Ganguly
- Section of Neonatal-Perinatal Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Abhishek Makkar
- Section of Neonatal-Perinatal Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Krishnamurthy Sekar
- Section of Neonatal-Perinatal Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
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Fichtner F, Moerer O, Weber-Carstens S, Nothacker M, Kaisers U, Laudi S. Clinical Guideline for Treating Acute Respiratory Insufficiency with Invasive Ventilation and Extracorporeal Membrane Oxygenation: Evidence-Based Recommendations for Choosing Modes and Setting Parameters of Mechanical Ventilation. Respiration 2019; 98:357-372. [PMID: 31505511 DOI: 10.1159/000502157] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 07/16/2019] [Indexed: 11/19/2022] Open
Abstract
For patients with acute respiratory insufficiency, mechanical ("invasive") ventilation is a fundamental therapeutic measure to ensure sufficient gas exchange. Despite decades of strong research efforts, central questions on mechanical ventilation therapy are still answered incompletely. Therefore, many different ventilation modes and settings have been used in daily clinical practice without scientifically sound bases. At the same time, implementation of the few evidence-based therapeutic concepts (e.g., "lung protective ventilation") into clinical practice is still insufficient. The aim of our guideline project "Mechanical ventilation and extracorporeal gas exchange in acute respiratory insufficiency" was to develop an evidence-based decision aid for treating patients with and on mechanical ventilation. It covers the whole pathway of invasively ventilated patients (including indications of mechanical ventilation, ventilator settings, additional and rescue therapies, and liberation from mechanical ventilation). To assess the quality of scientific evidence and subsequently derive recommendations, we applied the Grading of Recommendations, Assessment, Development and Evaluation method. For the first time, using this globally accepted methodological standard, our guideline contains recommendations on mechanical ventilation therapy not only for acute respiratory distress syndrome patients but also for all types of acute respiratory insufficiency. This review presents the two main chapters of the guideline on choosing the mode of mechanical ventilation and setting its parameters. The guideline group aimed that - by thorough implementation of the recommendations - critical care teams may further improve the quality of care for patients suffering from acute respiratory insufficiency. By identifying relevant gaps of scientific evidence, the guideline group intended to support the development of important research projects.
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Affiliation(s)
- Falk Fichtner
- Department of Anesthesiology and Intensive Care Medicine, University of Leipzig Medical Center, Leipzig, Germany,
| | - Onnen Moerer
- Center for Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Steffen Weber-Carstens
- Department of Anesthesiology and Operative Intensive Care Medicine, Charité, Universitätsmedizin Berlin, Berlin, Germany
| | - Monika Nothacker
- AWMF-Institute for Medical Knowledge Management (AWMF-IMWi), AWMF-office Berlin, Berlin, Germany
| | - Udo Kaisers
- Board of Directors, Ulm University Hospital, Ulm, Germany
| | - Sven Laudi
- Department of Anesthesiology and Intensive Care Medicine, University of Leipzig Medical Center, Leipzig, Germany
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Lewis SR, Pritchard MW, Thomas CM, Smith AF. Pharmacological agents for adults with acute respiratory distress syndrome. Cochrane Database Syst Rev 2019; 7:CD004477. [PMID: 31334568 PMCID: PMC6646953 DOI: 10.1002/14651858.cd004477.pub3] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Acute respiratory distress syndrome (ARDS) is a life-threatening condition caused by direct or indirect injury to the lungs. Despite improvements in clinical management (for example, lung protection strategies), mortality in this patient group is at approximately 40%. This is an update of a previous version of this review, last published in 2004. OBJECTIVES To evaluate the effectiveness of pharmacological agents in adults with ARDS on mortality, mechanical ventilation, and fitness to return to work at 12 months. SEARCH METHODS We searched CENTRAL, MEDLINE, Embase, and CINAHL on 10 December 2018. We searched clinical trials registers and grey literature, and handsearched reference lists of included studies and related reviews. SELECTION CRITERIA We included randomized controlled trials (RCTs) comparing pharmacological agents with control (placebo or standard therapy) to treat adults with established ARDS. We excluded trials of nitric oxide, inhaled prostacyclins, partial liquid ventilation, neuromuscular blocking agents, fluid and nutritional interventions and medical oxygen. We excluded studies published earlier than 2000, because of changes to lung protection strategies for people with ARDS since this date. DATA COLLECTION AND ANALYSIS Two review authors independently assessed studies for inclusion, extracted data, and assessed risks of bias. We assessed the certainty of evidence with GRADE. MAIN RESULTS We included 48 RCTs with 6299 participants who had ARDS; two included only participants with mild ARDS (also called acute lung injury). Most studies included causes of ARDS that were both direct and indirect injuries. We noted differences between studies, for example the time of administration or the size of dose, and because of unclear reporting we were uncertain whether all studies had used equivalent lung protection strategies.We included five types of agents as the primary comparisons in the review: corticosteroids, surfactants, N-acetylcysteine, statins, and beta-agonists. We included 15 additional agents (sivelestat, mesenchymal stem cells, ulinastatin, anisodimine, angiotensin-converting enzyme (ACE) inhibitor, recombinant human ACE2 (palifermin), AP301, granulocyte-macrophage colony stimulating factor (GM-CSF), levosimendan, prostacyclins, lisofylline, ketaconazole, nitroglycerins, L-2-oxothiazolidine-4-carboxylic acid (OTZ), and penehyclidine hydrochloride).We used GRADE to downgrade outcomes for imprecision (because of few studies and few participants), for study limitations (e.g. high risks of bias) and for inconsistency (e.g. differences between study data).Corticosteroids versus placebo or standard therapyCorticosteroids may reduce all-cause mortality within three months by 86 per 1000 patients (with as many as 161 fewer to 19 more deaths); however, the 95% confidence interval (CI) includes the possibility of both increased and reduced deaths (risk ratio (RR) 0.77, 95% CI 0.57 to 1.05; 6 studies, 574 participants; low-certainty evidence). Due to the very low-certainty evidence, we are uncertain whether corticosteroids make little or no difference to late all-cause mortality (later than three months) (RR 0.99, 95% CI 0.64 to 1.52; 1 study, 180 participants), or to the duration of mechanical ventilation (mean difference (MD) -4.30, 95% CI -9.72 to 1.12; 3 studies, 277 participants). We found that ventilator-free days up to day 28 (VFD) may be improved with corticosteroids (MD 4.09, 95% CI 1.74 to 6.44; 4 studies, 494 participants; low-certainty evidence). No studies reported adverse events leading to discontinuation of study medication, or fitness to return to work at 12 months (FTR).Surfactants versus placebo or standard therapyWe are uncertain whether surfactants make little or no difference to early mortality (RR 1.08, 95% CI 0.91 to 1.29; 9 studies, 1338 participants), or whether they reduce late all-cause mortality (RR 1.28, 95% CI 1.01 to 1.61; 1 study, 418 participants). Similarly, we are uncertain whether surfactants reduce the duration of mechanical ventilation (MD -2.50, 95% CI -4.95 to -0.05; 1 study, 16 participants), make little or no difference to VFD (MD -0.39, 95% CI -2.49 to 1.72; 2 studies, 344 participants), or to adverse events leading to discontinuation of study medication (RR 0.50, 95% CI 0.17 to 1.44; 2 studies, 88 participants). We are uncertain of these effects because we assessed them as very low-certainty. No studies reported FTR.N-aceytylcysteine versus placeboWe are uncertain whether N-acetylcysteine makes little or no difference to early mortality, because we assessed this as very low-certainty evidence (RR 0.64, 95% CI 0.32 to 1.30; 1 study, 36 participants). No studies reported late all-cause mortality, duration of mechanical ventilation, VFD, adverse events leading to study drug discontinuation, or FTR.Statins versus placeboStatins probably make little or no difference to early mortality (RR 0.99, 95% CI 0.78 to 1.26; 3 studies, 1344 participants; moderate-certainty evidence) or to VFD (MD 0.40, 95% CI -0.71 to 1.52; 3 studies, 1342 participants; moderate-certainty evidence). Statins may make little or no difference to duration of mechanical ventilation (MD 2.70, 95% CI -3.55 to 8.95; 1 study, 60 participants; low-certainty evidence). We could not include data for adverse events leading to study drug discontinuation in one study because it was unclearly reported. No studies reported late all-cause mortality or FTR.Beta-agonists versus placebo controlBeta-blockers probably slightly increase early mortality by 40 per 1000 patients (with as many as 119 more or 25 fewer deaths); however, the 95% CI includes the possibility of an increase as well as a reduction in mortality (RR 1.14, 95% CI 0.91 to 1.42; 3 studies, 646 participants; moderate-certainty evidence). Due to the very low-certainty evidence, we are uncertain whether beta-agonists increase VFD (MD -2.20, 95% CI -3.68 to -0.71; 3 studies, 646 participants), or make little or no difference to adverse events leading to study drug discontinuation (one study reported little or no difference between groups, and one study reported more events in the beta-agonist group). No studies reported late all-cause mortality, duration of mechanical ventilation, or FTR. AUTHORS' CONCLUSIONS We found insufficient evidence to determine with certainty whether corticosteroids, surfactants, N-acetylcysteine, statins, or beta-agonists were effective at reducing mortality in people with ARDS, or duration of mechanical ventilation, or increasing ventilator-free days. Three studies awaiting classification may alter the conclusions of this review. As the potential long-term consequences of ARDS are important to survivors, future research should incorporate a longer follow-up to measure the impacts on quality of life.
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Affiliation(s)
- Sharon R Lewis
- Royal Lancaster InfirmaryLancaster Patient Safety Research UnitPointer Court 1, Ashton RoadLancasterUKLA1 4RP
| | - Michael W Pritchard
- Royal Lancaster InfirmaryLancaster Patient Safety Research UnitPointer Court 1, Ashton RoadLancasterUKLA1 4RP
| | - Carmel M Thomas
- Greater Manchester Mental Health NHS Foundation TrustDepartment of Research and InnovationHarrop HousePrestwichManchesterUKM25 3BL
| | - Andrew F Smith
- Royal Lancaster InfirmaryDepartment of AnaesthesiaAshton RoadLancasterLancashireUKLA1 4RP
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Meyers M, Rodrigues N, Ari A. High-frequency oscillatory ventilation: A narrative review. CANADIAN JOURNAL OF RESPIRATORY THERAPY : CJRT = REVUE CANADIENNE DE LA THERAPIE RESPIRATOIRE : RCTR 2019; 55:40-46. [PMID: 31297448 PMCID: PMC6591785 DOI: 10.29390/cjrt-2019-004] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
High-frequency oscillatory ventilation (HFOV) is a lung-protective strategy that can be utilized in the full spectrum of patient populations ranging from neonatal to adults with acute lung injury. HFOV is often utilized as a rescue strategy when conventional mechanical ventilation (CV) has failed. HFOV uses low tidal volumes and constant mean airway pressures in conjunction with high respiratory rates to provide beneficial effects on oxygenation and ventilation, while eliminating the traumatic “inflate–deflate” cycle imposed by CV. Although statistical evidence supporting HFOV is particularly low, potential benefits for its application in many clinical manifestations still remain. High-frequency oscillation is a safe and effective rescue mode of ventilation for the treatment of acute respiratory distress syndrome (ARDS). All patients who have ventilator-induced lung injury (VILI) or are at risk of developing VILI or ARDS would be suitable candidates for HFOV, especially those who have failed conventional mechanical ventilation. This narrative aims to provide a review of HFOV vis-à-vis its indications, contraindications, hazards, parameters to monitoring, patient selection, clinical goals, mechanisms of action, controls for optimizing ventilation and oxygenation, clinical application in ARDS, and a comparison with other modes of mechanical ventilation.
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Affiliation(s)
| | - Nathan Rodrigues
- Department of Respiratory Care, Texas State University, Round Rock, TX, USA
| | - Arzu Ari
- Department of Respiratory Care, Texas State University, Round Rock, TX, USA
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Erdem Ö, Ince C, Tibboel D, Kuiper JW. Assessing the Microcirculation With Handheld Vital Microscopy in Critically Ill Neonates and Children: Evolution of the Technique and Its Potential for Critical Care. Front Pediatr 2019; 7:273. [PMID: 31338353 PMCID: PMC6629784 DOI: 10.3389/fped.2019.00273] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 06/17/2019] [Indexed: 12/17/2022] Open
Abstract
Assuring adequate tissue oxygenation in the critically ill, but still developing child is challenging. Conventional hemodynamic monitoring techniques fall short in assessing tissue oxygenation as these are directed at the macrocirculation and indirect surrogates of tissue oxygenation. The introduction of handheld vital microscopy (HVM) has allowed for the direct visualization of the microcirculation and with this has offered insight into tissue oxygenation on a microcirculatory level. Since its introduction, technical improvements have been made to HVM, to both hardware and software, and guidelines have been developed through expert consensus on image assessment and analysis. Using HVM, the microcirculation of the skin, the buccal mucosa, and the sublingual mucosa of healthy and (critically) ill neonates and children have been visualized and investigated. Yet, integration of HVM in hemodynamic monitoring has been limited due to technical shortcomings. Only superficial microcirculatory beds can be visualized, inter-observer and intra-observer variabilities are not accounted for and image analysis happens offline and is semi-automated and time-consuming. More importantly, patients need to be cooperative or fully sedated to prevent pressure and movement artifacts, which is often not the case in children. Despite these shortcomings, observational research with HVM in neonates and children has revealed the following: (1) age-related developmental changes in the microcirculation, (2) loss of hemodynamic coherence, i.e., microcirculatory disturbances in the presence of a normal macrocirculation and, (3) microcirculatory disturbances which were independently associated with increased mortality risk. Although these observations underline the importance of microcirculatory monitoring, several steps have to be taken before integration in the decision process during critical care can happen. These steps include technological innovations to ease the use of HVM in the pediatric age group, measuring additional functional parameters of microvascular blood flow and integrated automated analysis software. As a next step, reference values for microcirculatory parameters need to be established, while also accounting for developmental changes. Finally, studies on microcirculatory guided therapies are necessary to assess whether the integration of microcirculatory monitoring will actually improve patient outcome. Nevertheless, HVM remains a promising, non-invasive tool to help physicians assure tissue oxygenation in the critically ill child.
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Affiliation(s)
- Özge Erdem
- Intensive Care and Department of Pediatric Surgery, Erasmus University Medical Center - Sophia Children's Hospital, Rotterdam, Netherlands
| | - Can Ince
- Department of Intensive Care, Erasmus University Medical Center, Rotterdam, Netherlands.,Department of Translational Physiology, Amsterdam University Medical Center, Amsterdam, Netherlands
| | - Dick Tibboel
- Intensive Care and Department of Pediatric Surgery, Erasmus University Medical Center - Sophia Children's Hospital, Rotterdam, Netherlands
| | - Jan Willem Kuiper
- Intensive Care and Department of Pediatric Surgery, Erasmus University Medical Center - Sophia Children's Hospital, Rotterdam, Netherlands
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18
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Fichtner F, Moerer O, Laudi S, Weber-Carstens S, Nothacker M, Kaisers U. Mechanical Ventilation and Extracorporeal Membrane Oxygena tion in Acute Respiratory Insufficiency. DEUTSCHES ARZTEBLATT INTERNATIONAL 2018; 115:840-847. [PMID: 30722839 PMCID: PMC6375070 DOI: 10.3238/arztebl.2018.0840] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 06/18/2018] [Accepted: 09/12/2018] [Indexed: 01/02/2023]
Abstract
BACKGROUND Mechanical ventilation is life-saving for patients with acute respiratory insufficiency. In a German prevalence study, 13.6% of patients in intensive care units received mechanical ventilation for more than 12 hours; 20% of these patients received mechanical ventilation as treatment for acute respiratory distress syndrome (ARDS). The new S3 guideline is the first to contain recommendations for the entire process of treatment in these groups of patients (indications, ventilation modes/parameters, ac- companying measures, treatments for refractory impairment of gas exchange, weaning, and follow-up care). METHODS This guideline was developed according to the GRADE methods. Pertinent publications were identified by a systematic search of the literature, the quality of the evidence was evaluated, a risk/benefit assessment was conducted, and recommendations were issued by interdisciplinary consensus. RESULTS Mechanical ventilation is recommended as primary treatment for patients with severe ARDS. In other patient groups, non-in- vasive ventilation can lower mortality. If mechanical ventilation is needed, ventilation modes allowing spontaneous breathing seem beneficial (quality of evidence [QoE]: very low). Protective ventilation (high positive end-expiratory pressure, low tidal volume, limited peak pressure) improve the survival of ARDS patients (QoE: high). If a severe impairment of gas exchange is present, prone posi- tioning lessens mortality (QoE: high). Veno-venous extracorporeal membrane oxygenation (vvECMO) has not unequivocally been shown to improve survival. Early mobilization and weaning protocols can shorten the duration of ventilation (QoE: moderate). CONCLUSION Recommendations for patients undergoing mechanical ventilation include lung-protective ventilation, early sponta- neous breathing and mobilization, weaning protocols, and, for those with severe impairment of gas exchange, prone positioning. It is further recommended that patients with ARDS and refractory impairment of gas exchange should be transferred to an ARDS/ECMO center, where extracorporeal methods should be applied only after application of all other therapeutic options.
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Affiliation(s)
- Falk Fichtner
- Department of Anesthesiology and Intensive Care Medicine, University Hospital Leipzig
| | - Onnen Moerer
- Center for Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen
| | - Sven Laudi
- Department of Anesthesiology and Intensive Care Medicine, University Hospital Leipzig
| | - Steffen Weber-Carstens
- Department of Anesthesiology and Operative Intensive Care Medicin, Charité–Universitätsklinikum Berlin
| | - Monika Nothacker
- AWMF-Institute for Medical Knowledge Management (AWMF-IMWi), AWMF office Berlin
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Abstract
Acute Respiratory Distress Syndrome (ARDS) is a well-described disease process that can have numerous underlying causes, is commonly seen in the critical care setting, and is often under-recognized. ARDS is characterized by pulmonary edema with refractory hypoxemia, and was traditionally associated with a high mortality rate. The past few decades have generated many studies examining therapeutic interventions for ARDS; however, there are few Level 1 evidence-based interventions to this day that have been shown to improve mortality and outcomes. Lung protective ventilation remains the most studied and evidence-based intervention for the treatment of ARDS.
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Affiliation(s)
- Hemanshu Prabhakar
- Department of Neuroanaesthesiology and Critical Care, All India Institute of Medical Sciences, New Delhi, India
| | - Zulfiqar Ali
- Division of Neuroanesthesiology, Department of Anesthesiology, Sher-i-Kashmir Institute of Medical Sciences, Soura, Srinagar, Jammu and Kashmir India
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20
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Fielding-Singh V, Matthay MA, Calfee CS. Beyond Low Tidal Volume Ventilation: Treatment Adjuncts for Severe Respiratory Failure in Acute Respiratory Distress Syndrome. Crit Care Med 2018; 46:1820-1831. [PMID: 30247273 PMCID: PMC6277052 DOI: 10.1097/ccm.0000000000003406] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVES Despite decades of research, the acute respiratory distress syndrome remains associated with significant morbidity and mortality. This Concise Definitive Review provides a practical and evidence-based summary of treatments in addition to low tidal volume ventilation and their role in the management of severe respiratory failure in acute respiratory distress syndrome. DATA SOURCES We searched the PubMed database for clinical trials, observational studies, and review articles describing treatment adjuncts in acute respiratory distress syndrome patients, including high positive end-expiratory pressure strategies, recruitment maneuvers, high-frequency oscillatory ventilation, neuromuscular blockade, prone positioning, inhaled pulmonary vasodilators, extracorporeal membrane oxygenation, glucocorticoids, and renal replacement therapy. STUDY SELECTION AND DATA EXTRACTION Results were reviewed by the primary author in depth. Disputed findings and conclusions were then reviewed with the other authors until consensus was achieved. DATA SYNTHESIS Severe respiratory failure in acute respiratory distress syndrome may present with refractory hypoxemia, severe respiratory acidosis, or elevated plateau airway pressures despite lung-protective ventilation according to acute respiratory distress syndrome Network protocol. For severe hypoxemia, first-line treatment adjuncts include high positive end-expiratory pressure strategies, recruitment maneuvers, neuromuscular blockade, and prone positioning. For refractory acidosis, we recommend initial modest liberalization of tidal volumes, followed by neuromuscular blockade and prone positioning. For elevated plateau airway pressures, we suggest first decreasing tidal volumes, followed by neuromuscular blockade, modification of positive end-expiratory pressure, and prone positioning. Therapies such as inhaled pulmonary vasodilators, glucocorticoids, and renal replacement therapy have significantly less evidence in favor of their use and should be considered second line. Extracorporeal membrane oxygenation may be life-saving in selected patients with severe acute respiratory distress syndrome but should be used only when other alternatives have been applied. CONCLUSIONS Severe respiratory failure in acute respiratory distress syndrome often necessitates the use of treatment adjuncts. Evidence-based application of these therapies in acute respiratory distress syndrome remains a significant challenge. However, a rational stepwise approach with frequent monitoring for improvement or harm can be achieved.
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Affiliation(s)
- Vikram Fielding-Singh
- Department of Anesthesiology and Perioperative Medicine, University of California Los Angeles, Los Angeles, CA
| | - Michael A. Matthay
- Departments of Medicine and Anesthesia, Division of Pulmonary and Critical Care Medicine, University of California San Francisco, San Francisco, CA
| | - Carolyn S. Calfee
- Departments of Medicine and Anesthesia, Division of Pulmonary and Critical Care Medicine, University of California San Francisco, San Francisco, CA
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Janiaud P, Cristea IA, Ioannidis JPA. Industry-funded versus non-profit-funded critical care research: a meta-epidemiological overview. Intensive Care Med 2018; 44:1613-1627. [PMID: 30151688 PMCID: PMC6182357 DOI: 10.1007/s00134-018-5325-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 07/16/2018] [Indexed: 12/24/2022]
Abstract
Purpose To study the landscape of funding in intensive care research and assess whether the reported outcomes of industry-funded randomized controlled trials (RCTs) are more favorable. Methods We systematically assembled meta-analyses evaluating any type of intervention in the critical care setting and reporting the source of funding for each included RCT. Furthermore, when the intervention was a drug or biologic, we searched also the original RCT articles, when their funding information was unavailable in the meta-analysis. We then qualitatively summarized the sources of funding. For binary outcomes, separate summary odds ratios were calculated for trials with and without industry funding. We then calculated the ratio of odds ratios (RORs) and the summary ROR (sROR) across topics. ROR < 1 implies that the experimental intervention is relatively more favorable in trials with industry funding compared with trials without industry funding. For RCTs included in the ROR analysis, we also examined the conclusions of their abstract. Results Across 67 topics with 568 RCTs, 88 were funded by industry and another 73 had both industry and non-profit funding. Across 33 topics with binary outcomes, the sROR was 1.10 [95% CI (0.96–1.26), I2 = 1%]. Conclusions were not significantly more commonly unfavorable for the experimental arm interventions in industry-funded trials (21.3%) compared with trials without industry funding (18.2%). Conclusion Industry-funded RCTs are the minority in intensive care. We found no evidence that industry-funded trials in intensive care yield more favorable results or are less likely to reach unfavorable conclusions. Electronic supplementary material The online version of this article (10.1007/s00134-018-5325-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Perrine Janiaud
- Meta-Research Innovation Center at Stanford (METRICS), Stanford University, Stanford, CA, 94305, USA
| | - Ioana-Alinea Cristea
- Meta-Research Innovation Center at Stanford (METRICS), Stanford University, Stanford, CA, 94305, USA.,Department of Clinical Psychology and Psychotherapy, Babes-Bolyai University, Cluj-Napoca, Romania
| | - John P A Ioannidis
- Meta-Research Innovation Center at Stanford (METRICS), Stanford University, Stanford, CA, 94305, USA. .,Department of Clinical Psychology and Psychotherapy, Babes-Bolyai University, Cluj-Napoca, Romania. .,Department of Medicine, Stanford University, Stanford, CA, 94305, USA. .,Department of Health Research and Policy, Stanford University, Stanford, CA, 94305, USA. .,Department of Biomedical Data Science, Stanford University, Stanford, CA, 94305, USA. .,Department of Statistics, Stanford University, Stanford, CA, 94305, USA.
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Salvage therapies for refractory hypoxemia in ARDS. Respir Med 2018; 141:150-158. [PMID: 30053961 DOI: 10.1016/j.rmed.2018.06.030] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 05/15/2018] [Accepted: 06/29/2018] [Indexed: 02/06/2023]
Abstract
Acute Respiratory Distress Syndrome (ARDS) is a condition of varied etiology characterized by the acute onset (within 1 week of the inciting event) of hypoxemia, reduced lung compliance, diffuse lung inflammation and bilateral opacities on chest imaging attributable to noncardiogenic (increased permeability) pulmonary edema. Although multi-organ failure is the most common cause of death in ARDS, an estimated 10-15% of the deaths in ARDS are caused due to refractory hypoxemia, i.e.- hypoxemia despite lung protective conventional ventilator modes. In these cases, clinicians may resort to other measures with less robust evidence -referred to as "salvage therapies". These include proning, 48 h of paralysis early in the course of ARDS, various recruitment maneuvers, unconventional ventilator modes, inhaled pulmonary vasodilators, and Extracorporeal membrane oxygenation (ECMO). All the salvage therapies described have been associated with improved oxygenation, but with the exception of proning and 48 h of paralysis early in the course of ARDS, none of them have a proven mortality benefit. Based on the current evidence, no salvage therapy has been shown to be superior to the others and each of them is associated with its own risks and benefits. Hence, the order of application of these therapies varies in different institutions and should be applied following a risk-benefit analysis specific to the patient and local experience. This review explores the rationale, evidence, advantages and risks behind each of these strategies.
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Abstract
The management of the acute respiratory distress syndrome (ARDS) patient is fundamental to the field of intensive care medicine, and it presents unique challenges owing to the specialized mechanical ventilation techniques that such patients require. ARDS is a highly lethal disease, and there is compelling evidence that mechanical ventilation itself, if applied in an injurious fashion, can be a contributor to ARDS mortality. Therefore, it is imperative for any clinician central to the care of ARDS patients to understand the fundamental framework that underpins the approach to mechanical ventilation in this special scenario. The current review summarizes the major components of the mechanical ventilation strategy as it applies to ARDS.
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Affiliation(s)
- Oleg Epelbaum
- a Division of Pulmonary, Critical Care, and Sleep Medicine , Westchester Medical Center, New York Medical College , Valhalla , NY , USA
| | - Wilbert S Aronow
- b Division of Cardiology , Westchester Medical Center, New York Medical College , Valhalla , NY , USA
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