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https://www.readbyqxmd.com/read/28107552/reflections-on-the-history-of-indoor-air-science-focusing-on-the-last-50-years
#1
Jan Sundell
The scientific articles and Indoor Air conference publications of the indoor air sciences (IAS) during the last 50 years are summarized. In total 7524 presentations, from 79 countries, have been made at Indoor Air conferences held between 1978 (49 presentations) and 2014 (1049 presentations). In the Web of Science 26,992 articles on indoor air research (with the word "indoor" as a search term) have been found (as of 1 Jan 2016) of which 70% were published during the last 10 years. The modern scientific history started in the 1970s with a question: "did indoor air pose a threat to health as did outdoor air?" Soon it was recognized that indoor air is more important, from a health point of view, than outdoor air...
January 20, 2017: Indoor Air
https://www.readbyqxmd.com/read/28107207/dynamic-mechanical-interactions-between-neighboring-airspaces-determine-cyclic-opening-and-closure-in-injured-lung
#2
Ludovic Broche, Gaetano Perchiazzi, Liisa Porra, Angela Tannoia, Mariangela Pellegrini, Savino Derosa, Alessandra Sindaco, João Batista Borges, Loïc Degrugilliers, Anders Larsson, Göran Hedenstierna, Anthony S Wexler, Alberto Bravin, Sylvia Verbanck, Bradford J Smith, Jason H T Bates, Sam Bayat
OBJECTIVES: Positive pressure ventilation exposes the lung to mechanical stresses that can exacerbate injury. The exact mechanism of this pathologic process remains elusive. The goal of this study was to describe recruitment/derecruitment at acinar length scales over short-time frames and test the hypothesis that mechanical interdependence between neighboring lung units determines the spatial and temporal distributions of recruitment/derecruitment, using a computational model. DESIGN: Experimental animal study...
January 19, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28079607/mapping-regional-differences-of-local-pressure-volume-curves-with-electrical-impedance-tomography
#3
Alessandro Beda, Alysson R Carvalho, Nadja C Carvalho, Sören Hammermüller, Marcelo B P Amato, Thomas Muders, Claudia Gittel, Katharina Noreikat, Hermann Wrigge, Andreas W Reske
OBJECTIVES: Lung-protective mechanical ventilation aims to prevent alveolar collapse and overdistension, but reliable bedside methods to quantify them are lacking. We propose a quantitative descriptor of the shape of local pressure-volume curves derived from electrical impedance tomography, for computing maps that highlight the presence and location of regions of presumed tidal recruitment (i.e., elastance decrease during inflation, pressure-volume curve with upward curvature) or overdistension (i...
January 10, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28067830/bronchopulmonary-dysplasia-chronic-lung-disease-of-infancy-and-long-term-pulmonary-outcomes
#4
REVIEW
Lauren M Davidson, Sara K Berkelhamer
Bronchopulmonary dysplasia (BPD) is a chronic lung disease most commonly seen in premature infants who required mechanical ventilation and oxygen therapy for acute respiratory distress. While advances in neonatal care have resulted in improved survival rates of premature infants, limited progress has been made in reducing rates of BPD. Lack of progress may in part be attributed to the limited therapeutic options available for prevention and treatment of BPD. Several lung-protective strategies have been shown to reduce risks, including use of non-invasive support, as well as early extubation and volume ventilation when intubation is required...
January 6, 2017: Journal of Clinical Medicine
https://www.readbyqxmd.com/read/28036088/current-concepts-of-ards-a-narrative-review
#5
REVIEW
Michele Umbrello, Paolo Formenti, Luca Bolgiaghi, Davide Chiumello
Acute respiratory distress syndrome (ARDS) is characterized by the acute onset of pulmonary edema of non-cardiogenic origin, along with bilateral pulmonary infiltrates and reduction in respiratory system compliance. The hallmark of the syndrome is refractory hypoxemia. Despite its first description dates back in the late 1970s, a new definition has recently been proposed. However, the definition remains based on clinical characteristic. In the present review, the diagnostic workup and the pathophysiology of the syndrome will be presented...
December 29, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28019649/the-relative-accuracy-of-4d-dose-accumulation-for-lung-radiotherapy-using-rigid-dose-projection-versus-dose-recalculation-on-every-breathing-phase
#6
Gilmer Valdes, Chul Lee, Stephen Tenn, Percy Lee, Clifford Robinson, Keisuke Iwamoto, Daniel Low, James M Lamb
PURPOSE: To investigate the accuracy of 4D dose accumulation using projection of dose calculated on the end-exhalation, mid-ventilation, or average intensity breathing phase CT scan, versus dose accumulation performed using full Monte Carlo dose recalculation on every breathing phase. METHODS: Radiotherapy plans for 10 patients with stage I-II lung cancer were analyzed. All patients had respiratory-correlated computed tomography (4D-CT) performed as part of an IRB-approved research protocol...
December 26, 2016: Medical Physics
https://www.readbyqxmd.com/read/28013057/neural-control-of-ventilation-prevents-both-over-distension-and-de-recruitment-of-experimentally-injured-lungs
#7
Lukas Brander, Onnen Moerer, Göran Hedenstierna, Jennifer Beck, Jukka Takala, Arthur S Slutsky, Christer Sinderby
BACKGROUND: Endogenous pulmonary reflexes may protect the lungs during mechanical ventilation. We aimed to assess integration of continuous neurally adjusted ventilatory assist (cNAVA), delivering assist in proportion to diaphragm's electrical activity during inspiration and expiration, and Hering-Breuer inflation and deflation reflexes on lung recruitment, distension, and aeration before and after acute lung injury (ALI). METHODS: In 7 anesthetised rabbits with bilateral pneumothoraces, we identified adequate cNAVA level (cNAVAAL) at the plateau in peak ventilator pressure during titration procedures before (healthy lungs with endotracheal tube, [HLETT]) and after ALI (endotracheal tube [ALIETT] and during non-invasive ventilation [ALINIV])...
December 22, 2016: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28012314/do-air-quality-targets-really-represent-safe-limits-for-lung-cancer-risk
#8
G Buonanno, L Stabile, L Morawska, G Giovinco, X Querol
In order to estimate the lung cancer risk associated to airborne particles, exposure and risk-assessment studies ordinarily use particle mass concentration as dosimetry parameter. Consequently, the corresponding air quality targets are based on this metrics, neglecting the potential impact of ultrafine particles (UFPs) due to their negligible mass. The main purpose of this study was to evaluate the reliability of air quality targets in protecting Italian non-smoking people from lung cancer risk due to exposure to polycyclic aromatic hydrocarbons and some heavy metals associated with particle inhalation...
December 21, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/28008651/determinants-of-pre-transplantation-pectoralis-muscle-area-and-post-transplantation-change-in-pectoralis-muscle-area-in-lung-transplant-recipients
#9
Van Hoang, Gloria W Li, Christina C Kao, Goutham Dronavalli, Amit D Parulekar
BACKGROUND: This study aimed to determine predictors of pectoralis muscle area (PMA) and assess change in PMA following lung transplantation and its relationship to outcomes. METHODS: A retrospective review of 88 lung transplant recipients at a single center was performed. PMA was determined on a single axial slice from chest computerized tomography. Pectoralis muscle index (PMI) was calculated from the PMA divided by the height squared. RESULTS: PMI decreased post transplantation (8...
December 23, 2016: Clinical Transplantation
https://www.readbyqxmd.com/read/27999152/optimizing-peep-by-electrical-impedance-tomography-in-a-porcine-animal-model-of-ards
#10
Nadine Hochhausen, Ingeborg Biener, Rolf Rossaint, Andreas Follmann, Christian Bleilevens, Till Braunschweig, Steffen Leonhardt, Michael Czaplik
BACKGROUND: Mechanical ventilation is necessary in diverse clinical circumstances. Especially in the context of ARDS, so-called protective ventilation strategies must be followed. It is already known that PEEP might enhance oxygenation in ARDS. However, determining the optimal PEEP settings in clinical routines is challenging. Electrical impedance tomography (EIT) is a promising technique with which to adjust ventilator settings. We investigated whether the combination of different EIT parameters, namely the global inhomogeneity and hyperdistension indices, may lead to a feasible and safe PEEP setting...
December 20, 2016: Respiratory Care
https://www.readbyqxmd.com/read/27995008/desflurane-inhalation-before-ischemia-increases-ischemia-reperfusion-induced-vascular-leakage-in-isolated-rabbit-lungs
#11
Yoshiaki Oshima, Seiji Sakamoto, Kazumasa Yamasaki, Shinsuke Mochida, Kazumi Funaki, Naoki Moriyama, Akihiro Otsuki, Ryo Endo, Masato Nakasone, Shunsaku Takahashi, Tomomi Harada, Yukari Minami, Yoshimi Inagaki
BACKGROUND: Isoflurane and sevoflurane protect lungs with ischemia-reperfusion (IR) injury. We examined the influence of desflurane on IR lung injury using isolated rabbit lungs perfused with a physiological salt solution. METHODS: The isolated lungs were divided into three groups: IR, desflurane-treated ischemia-reperfusion (DES-IR), and ventilation/perfusion-continued control (Cont) groups (n = 6 per group). In the DES-IR group, inhalation of desflurane at 1 minimum alveolar concentration (MAC) was conducted in a stable 30-min phase...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27986329/preemptive-hemodynamic-intervention-restricting-the-administration-of-fluids-attenuates-lung-edema-progression-in-oleic-acid-induced-lung-injury
#12
A Gil Cano, M Gracia Romero, M I Monge García, P Guijo González, J Ruiz Campos
OBJECTIVE: A study is made of the influence of preemptive hemodynamic intervention restricting fluid administration upon the development of oleic acid-induced lung injury. DESIGN: A randomized in vivo study in rabbits was carried out. SETTING: University research laboratory. SUBJECTS: Sixteen anesthetized, mechanically ventilated rabbits. VARIABLES: Hemodynamic measurements obtained by transesophageal Doppler signal...
December 14, 2016: Medicina Intensiva
https://www.readbyqxmd.com/read/27984004/high-positive-end-expiratory-pressure-is-associated-with-improved-survival-in-obese-patients-with-acute-respiratory-distress-syndrome
#13
Christian Bime, Mallorie Fiero, Zhenqiang Lu, Eyal Oren, Cristine E Berry, Sairam Parthasarathy, Joe G N Garcia
BACKGROUND: In acute respiratory distress syndrome, minimizing lung injury from repeated collapse and reopening of alveoli by applying a high positive end expiratory pressure improves oxygenation without influencing mortality. Obesity causes alveolar atelectasis thus suggesting that a higher positive end expiratory pressure might be more protective among the obese. We hypothesized that the effect of applying a high positive end expiratory pressure on mortality from acute respiratory distress syndrome would differ by obesity status...
October 27, 2016: American Journal of Medicine
https://www.readbyqxmd.com/read/27956843/lung-protective-mechanical-ventilation-strategies-in-cardiothoracic-critical-care-a-retrospective-study
#14
Vasileios Zochios, Matthew Hague, Kimberly Giraud, Nicola Jones
A body of evidence supports the use of low tidal volumes in ventilated patients without lung pathology to slow progress to acute respiratory distress syndrome (ARDS) due to ventilator associated lung injury. We undertook a retrospective chart review and tested the hypothesis that tidal volume is a predictor of mortality in cardiothoracic (medical and surgical) critical care patients receiving invasive mechanical ventilation. Independent predictors of mortality in our study included: type of surgery, albumin, H(+), bilirubin, and fluid balance...
2016: International Journal of General Medicine
https://www.readbyqxmd.com/read/27941354/the-endothelial-glycocalyx-and-perioperative-lung-injury
#15
Florian Brettner, Vera von Dossow, Daniel Chappell
PURPOSE OF REVIEW: Ventilator-induced lung injury is a major contributor to perioperative lung injury. The end-expiratory lung volume, regional lung overdistension, and tidal recruitment are known to be the main factors causing subsequent alveolar damage and inflammation. The alveolar-capillary membrane including the endothelial glycocalyx as an integral part of the vascular endothelium seems to play a major role in different kinds of lung injury. RECENT FINDINGS: Recent studies underline the pivotal importance of the endothelial glycocalyx in lung injury...
February 2017: Current Opinion in Anaesthesiology
https://www.readbyqxmd.com/read/27936178/ex-vivo-lung-perfusion-in-the-rat-detailed-procedure-and-videos
#16
Giulia Alessandra Bassani, Caterina Lonati, Daniela Brambilla, Francesca Rapido, Franco Valenza, Stefano Gatti
Ex vivo lung perfusion (EVLP) is a promising procedure for evaluation, reconditioning, and treatment of marginal lungs before transplantation. Small animal models can contribute to improve clinical development of this technique and represent a substantial platform for bio-molecular investigations. However, to accomplish this purpose, EVLP models must sustain a prolonged reperfusion without pharmacological interventions. Currently available protocols only partly satisfy this need. The aim of the present research was accomplishment and optimization of a reproducible model for a protracted rat EVLP in the absence of anti-inflammatory treatment...
2016: PloS One
https://www.readbyqxmd.com/read/27935773/lung-protective-ventilation
#17
Rex A Marley, Kaycee Simon
Historically, mechanical ventilation of the lungs utilizing relatively large tidal volumes was common practice in the operating room and intensive care unit (ICU). The rationale behind this treatment strategy was to yield better patient outcomes, that is, fewer pulmonary complications, and a reduction in morbidity and mortality. As evidence-based practice has evolved, potential harmful effects of traditional, nonphysiological mechanical ventilation (ventilation with larger tidal volumes and the tolerance of high airway pressures) even in shortterm treatment have been shown to correlate with systemic inflammation and the development of ventilator-associated lung injury...
January 2017: Annual Review of Nursing Research
https://www.readbyqxmd.com/read/27932671/coupling-of-eit-with-computational-lung-modeling-for-predicting-patient-specific-ventilatory-responses
#18
Christian J Roth, Tobias Becher, Inez Frerichs, Norbert Weiler, Wolfgang A Wall
Providing personalised optimal mechanical ventilation for patients with acute or chronic respiratory failure is still a challenge within a clinical setting for each case anew. In this article, we integrate electrical impedance tomography (EIT) monitoring into a powerful patient-specific computational lung model to create an approach for personalising protective ventilatory treatment. The underlying computational lung model is able to predict global quantities e.g., tracheal flow and tidal volume, as well as local tissue aeration and strains for any ventilation manoeuvre...
December 8, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27925446/the-declined-levels-of-inflammatory-cytokines-related-with-weaning-rate-during-period-of-septic-patients-using-ventilators
#19
Chao-Huei Yang, Jung-Lung Hsiao, Ming-Feng Wu, Mei-Hua Lu, Hui-Ming Chang, Wang-Sheng Ko, Ya-Ling Chiou
INTRODUCTION: Approximately 50% of patients with sepsis-induced acute lung injury and acute respiratory distress syndrome require mechanical ventilation. Patients with extended mechanical ventilator use routinely develop reinfections, which increases hospital stay, mortality, and health care cost. Some studies have pointed out inflammatory factors concentrations can affect ventilator weaning, but do not indicate changed inflammatory factors related to ventilator weaning during using ventilators...
December 7, 2016: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/27925055/lung-protection-an-intervention-for-tidal-volume-reduction-in-a-teaching-intensive-care-unit
#20
Arturo Briva, Cristina Gaiero
Objective: To determine the effect of feedback and education regarding the use of predicted body weight to adjust tidal volume in a lung-protective mechanical ventilation strategy. Methods: The study was performed from October 2014 to November 2015 (12 months) in a single university polyvalent intensive care unit. We developed a combined intervention (education and feedback), placing particular attention on the importance of adjusting tidal volumes to predicted body weight bedside...
October 2016: Revista Brasileira de Terapia Intensiva
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