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https://www.readbyqxmd.com/read/27904536/a-review-on-human-respiratory-modeling
#1
REVIEW
Pardis Ghafarian, Hamidreza Jamaati, Seyed Mohammadreza Hashemian
Input impedance of the respiratory system is measured by forced oscillation technique (FOT). Multiple prior studies have attempted to match the electromechanical models of the respiratory system to impedance data. Since the mechanical behavior of airways and the respiratory system as a whole are similar to an electrical circuit in a combination of series and parallel formats some theories were introduced according to this issue. It should be noted that, the number of elements used in these models might be less than those required due to the complexity of the pulmonary-chest wall anatomy...
2016: Tanaffos
https://www.readbyqxmd.com/read/27898436/golden-anniversary-of-the-acute-respiratory-distress-syndrome-still-much-work-to-do
#2
Jesús Villar, Arthur S Slutsky
PURPOSE OF REVIEW: Over the past 50 years, we have developed a conceptual model of the acute respiratory distress syndrome (ARDS), and have witnessed significant advances in the care of patients with ARDS. In this commentary, we will discuss recent published articles reporting or suggesting new conceptual models for diagnosis, classification, stratification, prevention, ventilatory management, pharmacologic treatment, and outcome prediction of ARDS. RECENT FINDINGS: This review is a tribute to all clinicians and investigators that have contributed to a better understanding of ARDS...
November 24, 2016: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/27894328/effect-of-driving-pressure-on-mortality-in-ards-patients-during-lung-protective-mechanical-ventilation%C3%A2-in-two-randomized-controlled-trials
#3
Claude Guérin, Laurent Papazian, Jean Reignier, Louis Ayzac, Anderson Loundou, Jean-Marie Forel
BACKGROUND: Driving pressure (ΔPrs) across the respiratory system is suggested as the strongest predictor of hospital mortality in patients with acute respiratory distress syndrome (ARDS). We wonder whether this result is related to the range of tidal volume (VT). Therefore, we investigated ΔPrs in two trials in which strict lung-protective mechanical ventilation was applied in ARDS. Our working hypothesis was that ΔPrs is a risk factor for mortality just like compliance (Crs) or plateau pressure (Pplat,rs) of the respiratory system...
November 29, 2016: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/27892925/a-mouse-model-for-mers-coronavirus-induced-acute-respiratory-distress-syndrome
#4
Adam S Cockrell, Boyd L Yount, Trevor Scobey, Kara Jensen, Madeline Douglas, Anne Beall, Xian-Chun Tang, Wayne A Marasco, Mark T Heise, Ralph S Baric
Middle East respiratory syndrome coronavirus (MERS-CoV) is a novel virus that emerged in 2012, causing acute respiratory distress syndrome (ARDS), severe pneumonia-like symptoms and multi-organ failure, with a case fatality rate of ∼36%. Limited clinical studies indicate that humans infected with MERS-CoV exhibit pathology consistent with the late stages of ARDS, which is reminiscent of the disease observed in patients infected with severe acute respiratory syndrome coronavirus. Models of MERS-CoV-induced severe respiratory disease have been difficult to achieve, and small-animal models traditionally used to investigate viral pathogenesis (mouse, hamster, guinea-pig and ferret) are naturally resistant to MERS-CoV...
November 28, 2016: Nature Microbiology
https://www.readbyqxmd.com/read/27888550/mesenchymal-stem-stromal-cells-biology-and-preclinical-evidence-for-therapeutic-potential-for-organ-dysfunction-following-trauma-or-sepsis
#5
Michael A Matthay, Shibani Pati, Jae-Woo Lee
Several experimental studies have provided evidence that bone-marrow derived mesenchymal stem (stromal) cells (MSC) may be effective in treating critically ill surgical patients who develop traumatic brain injury, acute renal failure, or the acute respiratory distress syndrome. There is also preclinical evidence that MSC may be effective in treating sepsis-induced organ failure, including evidence that MSC have anti-microbial properties. This review considers preclinical studies with direct relevance to organ failure following trauma, sepsis or major infections that apply to critically ill patients...
November 26, 2016: Stem Cells
https://www.readbyqxmd.com/read/27873292/icu-management-based-on-picco-parameters-reduces-duration-of-mechanical-ventilation-and-icu-length-of-stay-in-patients-with-severe-thoracic-trauma-and-acute-respiratory-distress-syndrome
#6
Zhong Yuanbo, Wang Jin, Shi Fei, Long Liangong, Liu Xunfa, Xu Shihai, Shan Aijun
BACKGROUND: This study aimed to assess whether a management algorithm using data obtained with a PiCCO system can improve clinical outcomes in critically ill patients with acute respiratory distress syndrome (ARDS). RESULTS: The PaO2/FiO2 ratio increased over time in both groups, with a sharper increase in the PiCCO group. There was no difference in 28-day mortality (3.2 vs. 3.6%, P = 0.841). Days on mechanical ventilation (3 vs. 5 days, P = 0.002) and ICU length of stay (6 vs...
December 2016: Annals of Intensive Care
https://www.readbyqxmd.com/read/27873291/prediction-of-non-recovery-from-ventilator-demanding-acute-respiratory-failure-ards-and-death-using-lung-damage-biomarkers-data-from-a-1200-patient-critical-care-randomized-trial
#7
Jens-Ulrik S Jensen, Theis S Itenov, Katrin M Thormar, Lars Hein, Thomas T Mohr, Mads H Andersen, Jesper Løken, Hamid Tousi, Bettina Lundgren, Hans Christian Boesen, Maria E Johansen, Sisse R Ostrowski, Pär I Johansson, Jesper Grarup, Jørgen Vestbo, Jens D Lundgren
BACKGROUND: It is unclear whether biomarkers of alveolar damage (surfactant protein D, SPD) or conductive airway damage (club cell secretory protein 16, CC16) measured early after intensive care admittance are associated with one-month clinical respiratory prognosis. If patients who do not recover respiratory function within one month can be identified early, future experimental lung interventions can be aimed toward this high-risk group. We aimed to determine, in a heterogenous critically ill population, whether baseline profound alveolar damage or conductive airway damage has clinical respiratory impact one month after intensive care admittance...
December 2016: Annals of Intensive Care
https://www.readbyqxmd.com/read/27864287/double-hit-mouse-model-of-cigarette-smoke-priming-for-acute-lung-injury
#8
Pavlo Sakhatskyy, Zhengke Wang, Diana Borgas, Joanne Lomas-Neira, Yaping Chen, Alfred Ayala, Sharon Rounds, Qing Lu
Epidemiologic studies indicate that cigarette smoking (CS) increases the risk and severity of acute lung injury (ALI)/acute respiratory distress syndrome (ARDS). The mechanism is not understood at least in part due to lack of animal models that reproduce the key features of CS priming process. In this study, using two strains of mice we characterized a double-hit mouse model of ALI induced by CS priming of injury caused by lipopolysaccharide (LPS). C57BL/6 and AKR mice were pre-exposed to CS briefly (3 hours) or sub-acutely (3 weeks) before intra-tracheal instillation of LPS and ALI was assessed 18 hours after LPS administration by measuring lung static compliance, lung edema, vascular permeability, inflammation and alveolar apoptosis...
November 18, 2016: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/27855271/experimental-lung-injury-reduces-klf2-to-increase-endothelial-permeability-via-regulation-of-rapgef3-rac1-signaling
#9
Ru-Ting Huang, David Wu, Angelo Meliton, Myung-Jin Oh, Matthew Krause, Joyce A Lloyd, Recep Nigdelioglu, Robert B Hamanaka, Mukesh K Jain, Anna Birukova, John P Kress, Konstantin G Birukov, Gökhan M Mutlu, Yun Fang
RATIONALE: The acute respiratory distress syndrome (ARDS) is caused by widespread endothelial barrier disruption and uncontrolled cytokine storm. Genome-wide association studies (GWAS) have linked multiple genes to ARDS. Although mechano-sensitive transcription factor Krüppel-like factor 2 (KLF2) is a major regulator of endothelial function, its role in regulating pulmonary vascular integrity in lung injury and ARDS-associated GWAS genes remains poorly understood. OBJECTIVES: To examine KLF2 expression in multiple animal models of acute lung injury and further elucidate the KLF2-mediated pathways involved in endothelial barrier disruption and cytokine storm in experimental lung injury...
November 17, 2016: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/27846240/efficacy-and-safety-of-adjunctive-corticosteroids-therapy-for-severe-community-acquired-pneumonia-in-adults-an-updated-systematic-review-and-meta-analysis
#10
Jirui Bi, Jin Yang, Ying Wang, Cijiang Yao, Jing Mei, Ying Liu, Jiyu Cao, Youjin Lu
BACKGROUND: Adjunctive corticosteroids therapy is an attractive option for community-acquired pneumonia (CAP) treatment. However, the effectiveness of adjunctive corticosteroids on mortality of CAP remains inconsistent, especially in severe CAP. We performed a meta-analysis to evaluate the efficacy and safety of adjunctive corticosteroids in severe CAP patients. METHODS: Three databases of PubMed, EMBASE and Cochrane Library were searched for related studies published in English up to December, 2015...
2016: PloS One
https://www.readbyqxmd.com/read/27836120/computationally-efficient-analysis-of-particle-transport-and-deposition-in-a-human-whole-lung-airway-model-part-ii-dry-powder-inhaler-application
#11
Arun V Kolanjiyil, Clement Kleinstreuer, Ruxana T Sadikot
Pulmonary drug delivery is becoming a favored route for administering drugs to treat both lung and systemic diseases. Examples of lung diseases include asthma, cystic fibrosis and chronic obstructive pulmonary disease (COPD) as well as respiratory distress syndrome (ARDS) and pulmonary fibrosis. Special respiratory drugs are administered to the lungs, using an appropriate inhaler device. Next to the pressurized metered-dose inhaler (pMDI), the dry powder inhaler (DPI) is a frequently used device because of the good drug stability and a minimal need for patient coordination...
November 3, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/27835962/soluble-programmed-cell-death-receptor-1-spd-1-a-potential-biomarker-with-anti-inflammatory-properties-in-human-and-experimental-acute-respiratory-distress-syndrome-ards
#12
Sean F Monaghan, Chun-Shiang Chung, Yaping Chen, Joanne Lomas-Neira, William G Fairbrother, Daithi S Heffernan, William G Cioffi, Alfred Ayala
BACKGROUND: Acute respiratory distress syndrome (ARDS) remains a common organ dysfunction in the critically ill patient. Mechanisms for its development have focused on immune mediated causes, aspects of our understanding are not complete, and we lack biomarkers. DESIGN, SETTING, AND SUBJECTS: Blood and bronchial alveolar lavage fluid (BAL) from humans (n = 10-13) with ARDS and controls (n = 5-10) as well as a murine model of ARDS (n = 5-6) with controls (n = 6-7) were studied...
November 11, 2016: Journal of Translational Medicine
https://www.readbyqxmd.com/read/27831560/manipulating-the-air-filled-zebrafish-swim-bladder-as-a-neutrophilic-inflammation-model-for-acute-lung-injury
#13
Yuefei Zhang, Hongcui Liu, Junlin Yao, Yanfeng Huang, Shenlu Qin, Zheng Sun, Yingchun Xu, Shu Wan, Hongqiang Cheng, Chunqi Li, Xue Zhang, Yuehai Ke
Acute lung injury (ALI) and its more severe form, acute respiratory distress syndrome (ARDS), are life-threatening diseases that are associated with high mortality rates due to treatment limitations. Neutrophils play key roles in the pathogenesis of ALI/ARDS by promoting the inflammation and injury of the alveolar microenvironment. To date, in vivo functional approaches have been limited by the inaccessibility to the alveolar sacs, which are located at the anatomical terminal of the respiratory duct in mammals...
November 10, 2016: Cell Death & Disease
https://www.readbyqxmd.com/read/27815261/soluble-epoxide-hydrolase-deficiency-or-inhibition-enhances-murine-hypoxic-pulmonary-vasoconstriction-after-lipopolysaccharide-challenge
#14
Martin Wepler, Arkadi Beloiartsev, Mary D Buswell, Dipak Panigrahy, Rajeev Malhotra, Emmanuel S Buys, Peter Radermacher, Fumito Ichinose, Donald B Bloch, Warren M Zapol
RATIONALE: Hypoxic pulmonary vasoconstriction (HPV) is the response of the pulmonary vasculature to low levels of alveolar oxygen. HPV improves systemic arterial oxygenation by matching pulmonary perfusion to ventilation during alveolar hypoxia, and is impaired in lung diseases such as the acute respiratory distress syndrome (ARDS) and in experimental models of endotoxemia. Epoxyeicosatrienoic acids (EETs) are pulmonary vasoconstrictors, which are metabolized to less vasoactive dihydroxyeicosatrienoic acids (DHETs) by soluble epoxide hydrolase (sEH)...
November 4, 2016: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/27810746/acid-rock-drainage-passive-remediation-potential-use-of-alkaline-clay-optimal-mixing-ratio-and-long-term-impacts
#15
Fernando Plaza, Yipei Wen, Hanna Perone, Yi Xu, Xu Liang
Acid rock drainage (ARD) is one of the most adverse environmental problems of the mining industry. Surface and ground water affected by this pollution are characterized by their acidity and the high content of sulfates and metals/metalloids. In this study, alkaline clay (AC), an industrial waste with a high alkalinity, which is utilized in the alumina refining process, was used as the remediation material to inhibit pyrite oxidation in waste coal piles. Through a series of laboratory experiments (static and kinetic), complemented with field measurements and geochemical modeling, three important issues associated with this passive and sustainable ARD remediation method were investigated: 1) the potential use of alkaline clay as an ARD remediation material, 2) the adequate alkaline clay/coal refuse mixing ratio (AC/CR) to ensure pH values close to neutral conditions, and, 3) the implications for long-term performance, in terms of the trends of the main parameters involved in this process such as pH, concentrations of sulfate, iron and other dissolved contaminants...
October 27, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27809752/dok3-degradation-is-required-for-the-development-of-lps-induced-ards-in-mice
#16
Ning Liu, Xiaofeng Liu, Xiaoou Li, Kaifang Duan, Yuming Deng, Xiuyan Yu, Qisheng Peng
It has been reported that DOK3 protein negatively regulates LPS responses and endotoxin tolerance in mice. However, the role of DOK3 in the development of acute respiratory distress syndrome (ARDS) remains unknown. In this study, we showed that DOK3 is degraded in the lung tissues of LPS-induced ARDS. Through lentivirus infection containing DOK3(K27R) via the intranasal route, we created a mice model, in which DOK3 maintains stable expression. We found that the forced DOK3 expression significantly attenuated LPS-induced pulmonary histological alterations, inflammatory cells infiltration, lung edema, as well as the generation of inflammatory cytokines TNFα, IL-1βand IL-6 in BALF of LPS-induced ARDS mice...
November 3, 2016: Current Gene Therapy
https://www.readbyqxmd.com/read/27806995/septic-porcine-blood-does-not-further-activate-coagulation-during-in-vitro-membrane-oxygenation
#17
Christian Bleilevens, Oliver Grottke, Sabine Groening, Markus Honickel, Rüdger Kopp, Smriti Singh, Jutta Arens, Rolf Rossaint
OBJECTIVES: For patients with a severe acute respiratory distress syndrome (ARDS), extracorporeal membrane oxygenation (ECMO) represents a life-saving measure. Frequently, patients with severe ARDS also show signs of severe sepsis. As blood contact with the membrane oxygenator surface leads to adverse effects due to insufficient biocompatibility partly caused by activation of platelets, coagulation factors and leucocytes, we hypothesized that these adverse effects would be amplified if septic blood in a preactivated state came into contact with the membrane oxygenator...
November 2, 2016: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/27802900/downregulation-of-mir-181a-protects-mice-from-lps-induced-acute-lung-injury-by-targeting-bcl-2
#18
Wuquan Li, Xiaochen Qiu, He Jiang, Yalong Han, Dinan Wei, Jun Liu
Acute lung injury/acute respiratory distress syndrome (ALI/ARDS) is a progressive syndrome with a high incidence and mortality rate. Apoptosis is a very important pathological feature of ALI. Recently, more and more researches on mircoRNAs are involved in the regulation of proliferation and apoptosis of cancer cells. However, the functions of microRNAs in ALI remain unknown. In this study, PCR array and qRT-PCR were used to investigate microRNA profiles and miR-181a regulates apoptosis induced by LPS. Then, we predict the potential target gene of miR-181a is BCL-2 by bioinformatics methods, and validate it using luciferase reporter gene assays...
October 29, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27799180/high-peep-in-acute-respiratory-distress-syndrome-quantitative-evaluation-between-improved-arterial-oxygenation-and-decreased-oxygen-delivery
#19
M Chikhani, A Das, M Haque, W Wang, D G Bates, J G Hardman
BACKGROUND: Positive end-expiratory pressure (PEEP) is widely used to improve oxygenation and prevent alveolar collapse in mechanically ventilated patients with the acute respiratory distress syndrome (ARDS). Although PEEP improves arterial oxygenation predictably, high-PEEP strategies have demonstrated equivocal improvements in ARDS-related mortality. The effect of PEEP on tissue oxygen delivery is poorly understood and is difficult to quantify or investigate in the clinical environment...
November 2016: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/27796971/geochemical-behavior-of-an-acid-drainage-system-the-case-of-the-amarillo-river-famatina-la-rioja-argentina
#20
K L Lecomte, S N Maza, G Collo, A M Sarmiento, P J Depetris
The Amarillo River (Famatina range, Argentina, ~29° S and ~67° W) is unusual because acid mine drainage (AMD) is superimposed on the previously existing acid rock drainage (ARD) scenario, as a Holocene paleolake sedimentary sequence shows. In a markedly oxidizing environment, its water is currently ferrous and of the sulfate-magnesium type with high electrical conductivity (>10 mS cm(-1) in uppermost catchments). At the time of sampling, the interaction of the mineralized zone with the remnants of mining labors determined an increase in some elements (e...
October 28, 2016: Environmental Science and Pollution Research International
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