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Normal lung physiology

Margaret L Salisbury, David A Lynch, Edwin J R van Beek, Ella A Kazerooni, Junfeng Guo, Meng Xia, Susan Murray, Kevin J Anstrom, Eric Yow, Fernando J Martinez, Eric A Hoffman, Kevin R Flaherty
RATIONALE: Adaptive Multiple Features Method (AMFM) lung texture analysis software recognizes high-resolution computed tomography (HRCT) patterns. OBJECTIVES: We evaluated AMFM and visual quantification of HRCT patterns and their relationship with disease progression in Idiopathic Pulmonary Fibrosis. METHODS: IPF patients in a clinical trial of prednisone, azathioprine, and N-acetylcysteine underwent HRCT at study start and finish. Proportion of lung occupied by ground glass, ground glass-reticular (GGR), honeycombing, emphysema, and normal were measured by AMFM and 3 radiologists, documenting baseline disease extent and post-baseline change...
October 21, 2016: American Journal of Respiratory and Critical Care Medicine
Britta Langen, Nils Rudqvist, Khalil Helou, Eva B Forssell-Aronsson
INTRODUCTION: Targeted α-therapy is a promising treatment option for various types of malignant tumors. Radiolabeled cancer-seeking agents, however, undergo degradation resulting in a certain percentage of free radionuclide in the body. The radiohalogen (211)At accumulates in various tissues with specifically high uptake in the thyroid. When normal thyroid function is disturbed due to ionizing radiation (IR) exposure, deleterious effects can occur in tissues that depend on thyroid hormone (TH) regulation for normal physiological function...
October 20, 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
Peter B Terry, Richard J Traystman
Oxygen delivery and carbon dioxide removal being critical to cell survival, mammals have developed collateral vascular and ventilation systems to ensure tissue viability. Collateral ventilation, defined as ventilation of alveoli via pathways that bypass normal airways, is present in humans and many other species. The presence of collateral ventilation can be beneficial in certain disease states, while its relative absence can predispose to other diseases. These well defined anatomical pathways contribute little to ventilation in normal humans, but modulate ventilation perfusion imbalance in a variety of diseases including obstructive diseases such as asthma and emphysema...
October 14, 2016: Annals of the American Thoracic Society
Amir Soltani, Eugene Haydn Walters, David W Reid, Shakti Dhar Shukla, Kaosia Nowrin, Chris Ward, H Konrad Muller, Sukhwinder Singh Sohal
BACKGROUND: This study assessed the effects of inhaled corticosteroid (ICS) on airway vascular remodeling in chronic obstructive pulmonary disease (COPD). METHODS: Thirty-four subjects with mild-to-moderate COPD were randomly allocated 2:1 to ICS or placebo treatment in a double-blinded clinical trial over 6 months. Available tissue was compared before and after treatment for vessel density, and expression of VEGF, TGF-β1, and TGF-β1-related phosphorylated transcription factors p-SMAD 2/3...
2016: International Journal of Chronic Obstructive Pulmonary Disease
Erik Arbeid, Alessio Demi, Etrusca Brogi, Elisa Gori, Teresa Giusto, Gino Soldati, Luigi Vetrugno, Francesco Giunta, Francesco Forfori
BACKGROUND/AIMS: The normal lung ultrasound (US) pattern during a regular pregnancy has not been evaluated extensively in the current literature. Pregnancy-related changes in the respiratory tract affect maternal predisposition to several respiratory complications; consequently, it is important to differentiate between a physiologic pattern during pregnancy and a pathologic lung pattern, due to respiratory failure. The goal of our study was to assess the normal US lung pattern in women without known comorbidities in the last weeks of pregnancy...
October 5, 2016: Gynecologic and Obstetric Investigation
Nidal Amin Jaradat, Hamzeh Al Zabadi, Belal Rahhal, Azmi Mahmoud Ali Hussein, Jamal Shaker Mahmoud, Basel Mansour, Ahmad Ibrahim Khasati, Abdelkhaleq Issa
BACKGROUND: Recently, there has been an increased interest in the effects of essential oils on athletic performances and other physiological effects. This study aimed to assess the effects of Citrus sinensis flower and Mentha spicata leaves essential oils inhalation in two different groups of athlete male students on their exercise performance and lung function. METHODS: Twenty physical education students volunteered to participate in the study. The subjects were randomly assigned into two groups: Mentha spicata and Citrus sinensis (ten participants each)...
2016: Journal of the International Society of Sports Nutrition
Deme Swaroopa, Kakarla Bhaskar, T Mahathi, Shivakrishna Katkam, Y Satyanarayana Raju, Naval Chandra, Vijay Kumar Kutala
BACKGROUND AND AIM: Studies on potential biomarkers in experimental models of acute lung injury (ALI) and clinical samples from patients with ALI have provided evidence to the pathophysiology of the mechanisms of lung injury and predictor of clinical outcome. Because of the high mortality and substantial variability in outcomes in patients with acute respiratory distress syndrome (ARDS), identification of biomarkers such as cytokines is important to determine prognosis and guide clinical decision-making...
September 2016: Indian Journal of Critical Care Medicine
S Bommart, J P Berthet, G Durand, B Ghaye, J L Pujol, C Marty-Ané, H Kovacsik
The major lung resections are the pneumonectomies and lobectomies. The sublobar resections are segmentectomies and wedge resections. These are performed either through open surgery through a thoracotomy or by video-assisted mini-invasive surgery for lobectomies and sublobar resections. Understanding the procedures involved allows the normal postoperative appearances to be interpreted and these normal anatomical changes to be distinguished from potential postoperative complications. Surgery results in a more or less extensive physiological adaptation of the chest cavity depending on the lung volume, which has been resected...
October 2016: Diagnostic and Interventional Imaging
Yanfei Wang, Ivan J Dmochowski
Molecular imaging holds considerable promise for elucidating biological processes in normal physiology as well as disease states, by determining the location and relative concentration of specific molecules of interest. Proton-based magnetic resonance imaging ((1)H MRI) is nonionizing and provides good spatial resolution for clinical imaging but lacks sensitivity for imaging low-abundance (i.e., submicromolar) molecular markers of disease or environments with low proton densities. To address these limitations, hyperpolarized (hp) (129)Xe NMR spectroscopy and MRI have emerged as attractive complementary methodologies...
October 18, 2016: Accounts of Chemical Research
Dalya Ataca, Marian Caikovski, Alessandra Piersigilli, Alexandre Moulin, Charaf Benarafa, Sarah E Earp, Yakir Guri, Corinne Kostic, Yvan Arsenivic, Raija Soininen, Suneel S Apte, Cathrin Brisken
The ADAMTS family comprises 19 secreted metalloproteinases that cleave extracellular matrix components and have diverse functions in numerous disease and physiological contexts. A number of them remain 'orphan' proteases, among them ADAMTS18, which has been implicated in developmental eye disorders, platelet function and various malignancies. To assess in vivo function of ADAMTS18, we generated a mouse strain with inactivated Adamts18 alleles. In the C57Bl6/Ola background, Adamts18 deficient mice are born in a normal Mendelian ratio, and are viable but show a transient growth delay...
October 11, 2016: Biology Open
Daniel J Schneider, Jennifer M Speth, Marc Peters-Golden
Unconventional secretion and subsequent uptake of molecular cargo via extracellular vesicles (EVs) is an important mechanism by which cells can exert paracrine effects. While this phenomenon has been widely characterized in the context of their ability to promote inflammation, less is known about the ability of EVs to transfer immunosuppressive cargo. Maintenance of normal physiology in the lung requires suppression of potentially damaging inflammatory responses to the myriad of insults to which it is continually exposed...
2016: Frontiers in Cell and Developmental Biology
Stephen H Loring, George P Topulos, Rolf D Hubmayr
Recent studies applying the principles of respiratory mechanics to respiratory disease have used inconsistent and mutually exclusive definitions of the term "transpulmonary pressure." By the traditional definition, transpulmonary pressure is the pressure across the whole lung including the intrapulmonary airways, i.e., the pressure difference between the opening to the pulmonary airway and the pleural surface. However more recently, transpulmonary pressure has also been defined as the pressure across only the lung tissue, i...
September 8, 2016: American Journal of Respiratory and Critical Care Medicine
Kamonpun Ussavarungsi, Augustine S Lee, Charles D Burger
OBJECTIVES: Pulmonary hypertension (PH) is commonly observed in patients with diffuse parenchymal lung disease (DPLD). The purpose of this study was to explore the influence of the 6-minute walk test (6MWT) as a simple, non-invasive tool to assess right ventricular (RV) function in patients with DPLD and to identify the need for an echocardiogram (ECHO) to screen for PH. METHODS: We retrospectively reviewed 48 patients with PH secondary to DPLD, who were evaluated in the PH clinic at the Mayo Clinic in Jacksonville, Florida, from January 1999 to December 2014...
September 2016: Oman Medical Journal
Heather M Evans, Grady L Bryant, Beth A Garvy
The cyst cell wall β-glucans of Pneumocystis have been shown to stimulate immune responses in lung epithelial cells, dendritic cells, and alveolar macrophages. Little is known about how the trophic life forms, which do not have a fungal cell wall, interact with these innate immune cells. Here, we report differences in the responses of both neonatal and adult mice to the trophic and cystic life cycle stages of Pneumocystis murina The adult and neonatal immune responses to infection with Pneumocystis murina trophic forms were less robust than the response to infection with a physiologically normal mixture of cysts and trophic forms...
August 29, 2016: Infection and Immunity
Loren C Denlinger, Brenda R Phillips, Sima Ramratnam, Kristie Ross, Nirav R Bhakta, Juan Carlos Cardet, Mario Castro, Stephen P Peters, Wanda Phipatanakul, Shean Aujla, Leonard B Bacharier, Eugene R Bleecker, Suzy A A Comhair, Andrea Coverstone, Mark DeBoer, Serpil C Erzurum, Sean B Fain, Merritt Fajt, Anne M Fitzpatrick, Jonathan Gaffin, Benjamin Gaston, Annette T Hastie, Gregory A Hawkins, Fernando Holguin, Anne-Marie Irani, Elliot Israel, Bruce D Levy, Ngoc Ly, Deborah A Meyers, Wendy C Moore, Ross Myers, Maria Theresa D Opina, Michael C Peters, Mark L Schiebler, Ronald L Sorkness, W Gerald Teague, Sally E Wenzel, Prescott G Woodruff, David T Mauger, John V Fahy, Nizar N Jarjour
RATIONALE: Reducing asthma exacerbation frequency is an important criterion for approval of asthma therapies, but the clinical features of exacerbation prone asthma (EPA) remain incompletely defined. OBJECTIVE: Describe the clinical, physiological, inflammatory and co-morbidity factors associated with EPA. METHODS: Baseline data from the NHLBI Severe Asthma Research Program-3 were analyzed. An exacerbation was defined as a burst of systemic corticosteroids lasting ≥3 days...
August 24, 2016: American Journal of Respiratory and Critical Care Medicine
L J Jia, L Yi, Z X Yang, S P Wang, G Li, X Zhu
OBJECTIVE: To explore the effect of ulinastatin on prevention of acute respiratory distress syndrome (ARDS). METHODS: A prospective multicentral cohort study was conducted. The patients from three intensive care units (ICUs) of grade A tertiary hospitals in Beijing and a ICU of grade A tertiary hospitals in Cangzhou from January 2012 to December 2014, included 77 ARDS at-risk patients with ulinastatin treatment and 108 ARDS at-risk patients without ulinastatin treatment (control) were eligible...
February 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Robert A Stockley, Ross G Edgar, Anilkumar Pillai, Alice M Turner
BACKGROUND: Chronic obstructive pulmonary disease (COPD) is characterized by fixed airflow obstruction and accelerated decline of forced expired volume in 1 second (FEV1). Alpha-1-antitrypsin deficiency is a genetic cause of COPD and associated with more rapid decline in lung function, even in some never smokers (NS) but the potential for individualized assessment to reveal differences when compared to group analyses has rarely been considered. METHODS: We analyzed decline in post-bronchodilator FEV1 and gas transfer (% predicted) over at least 3 years (mean= 6...
2016: International Journal of Chronic Obstructive Pulmonary Disease
Anna M Swanson, Carlo A Rossi, Keren Ofir, Vedanta Mehta, Michael Boyd, Hannah Barker, Agata Ledwozyw, Owen Vaughan, John Martin, Ian Zachary, Neil Sebire, Donald M Peebles, Anna L David
In a model of growth-restricted sheep pregnancy, it was previously demonstrated that transient uterine artery VEGF overexpression can improve fetal growth. This approach was tested in guinea-pig pregnancies, where placental physiology is more similar to humans. Fetal growth restriction (FGR) was attained through peri-conceptual nutrient restriction in virgin guinea pigs. Ad.VEGF-A165 or Ad.LacZ (1 × 10(10)vp) was applied at mid-gestation via laparotomy, delivered externally to the uterine circulation with thermosensitive gel...
August 16, 2016: Human Gene Therapy
Neil J Stewart, Juan Parra-Robles, Jim M Wild
Existing models of (129)Xe diffusive exchange for lung microstructural modeling with time-resolved MR spectroscopy data have considered analytical solutions to one-dimensional, homogeneous models of the lungs with specific assumptions about the alveolar geometry. In order to establish a model system for simulating the effects of physiologically-realistic changes in physical and microstructural parameters on (129)Xe exchange NMR, we have developed a 3D alveolar capillary model for finite element analysis. To account for the heterogeneity of the alveolar geometry across the lungs, we have derived realistic geometries for finite element analysis based on 2D histological samples and 3D micro-CT image volumes obtained from ex vivo biopsies of lung tissue from normal subjects and patients with interstitial lung disease...
October 2016: Journal of Magnetic Resonance
Nicla A Varnier, Sarah Chwah, Trent Miller, Franziska Pettit, Mark Brown, David Rees, Amanda Henry
BACKGROUND: Shortness of breath is a common physiological pregnancy presentation, secondary to both hormonal and mechanical effects. Its pathological causes are common (asthma exacerbation or infection); new-onset cardiac pathology is rarely considered. CASE: JC, a 39-year old G4P2T1, presented at 34 weeks' gestation with shortness of breath unrelieved by salbutamol. History included asthma, poly-drug abuse and smoking. Initial presentation was consistent with asthma exacerbation and she was treated as such...
September 2015: Obstetric Medicine
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