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Hyperinflation

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https://www.readbyqxmd.com/read/28736210/effects-of-positive-expiratory-pressure-on-chest-wall-volumes-in-subjects-with-stroke-compared-to-healthy-controls-a-case-control-study
#1
Elis E A Cabral, Vanessa R Resqueti, Illia N D F Lima, Lucien P Gualdi, Andrea Aliverti, Guilherme A F Fregonezi
BACKGROUND: Alterations in respiratory system kinematics in stroke lead to restrictive pattern associated with decreased lung volumes. Chest physical therapy, such as positive expiratory pressure, may be useful in the treatment of these patients; however, the optimum intensity to promote volume and motion changes of the chest wall remains unclear. OBJECTIVE: To assess the effect of different intensities of positive expiratory pressure on chest wall kinematics in subjects with stroke compared to healthy controls...
July 8, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28732830/impact-of-laba-lama-combination-on-exercise-endurance-and-lung-hyperinflation-in-copd-a-pair-wise-and-network-meta-analysis
#2
REVIEW
Luigino Calzetta, Josuel Ora, Francesco Cavalli, Paola Rogliani, Denis E O'Donnell, Mario Cazzola
BACKGROUND: The ability to exercise is an important clinical outcome in COPD, and the improvement in exercise capacity is recognized to be an important goal in the management of COPD. Therefore, since the current interest in the use of bronchodilators in COPD is gradually shifting towards the dual bronchodilation, we carried out a meta-analysis to evaluate the impact of LABA/LAMA combination on exercise capacity and lung hyperinflation in COPD. METHODS: RCTs were identified after a search in different databases of published and unpublished trials...
August 2017: Respiratory Medicine
https://www.readbyqxmd.com/read/28729396/acute-volume-loading-exacerbates-direct-ventricular-interaction-in-a-model-of-copd
#3
William Spencer Cheyne, Alexandra Mackenzie Williams, Megan I Harper, Neil Derek Eves
Volume loading increases left ventricular (LV) stroke volume (LVSV) through series interaction but may paradoxically reduce LVSV in the presence of large increases in right ventricular (RV) afterload due to direct ventricular interaction (DVI). RV afterload is often increased in COPD as a result of pathological changes to respiratory mechanics, namely increased negative intrathoracic pressure (nITP), dynamic lung hyperinflation (DH) and increased pulmonary vascular resistance (PVR). These hallmarks of COPD negatively impact LV hemodynamics in normovolemia...
July 20, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28728274/-a-retrospective-study-of-10-cases-of-post-transplant-bronchiolitis-obliterans
#4
J J Chai, T Liu, B Q Cai, H D Zhu
Objective: To analyze the clinical features of bronchiolitis obliterans syndrome (BOS) in patients with allogeneic hematopoietic stem cell transplantation (HSCT). Methods: This retrospective study included patients who underwent allogeneic HSCT from January 1998 to December 2016. The clinical features, radiological manifestations and treatment of clinically proven BOS were reviewed. Results: Of 681 patients who experienced HSCT, 10(1.47%) met the diagnostic criteria. The duration of BOS onset after transplantation was 5-48 months, averaging (18±15) months...
July 12, 2017: Chinese Journal of Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/28727052/rapid-communication-subclinical-bovine-respiratory-disease-loci-and-pathogens-associated-with-lung-lesions-in-feedlot-cattle
#5
J N Kiser, T E Lawrence, M Neupane, C M Seabury, J F Taylor, J E Womack, H L Neibergs
Bovine respiratory disease (BRD) is an economically important disease of feedlot cattle that is caused by viral and bacterial pathogen members of the BRD complex. Many cases of subclinical BRD go untreated and are not detected until slaughter, when lung lesions are identified. The objectives of this study were to identify which BRD pathogens were associated with the presence of lung lesions at harvest and to identify genomic loci that were associated with susceptibility to lung lesions as defined by consolidation of the lung and/or the presence of fibrin tissue...
June 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28698266/spirometry-static-lung-volumes-and-diffusing-capacity
#6
Carlos A Vaz Fragoso, Hilary C Cain, Richard Casaburi, Patty J Lee, Lynne Iannone, Linda S Leo-Summers, Peter H Van Ness
BACKGROUND: Spirometric Z-scores from the Global Lung Initiative (GLI) rigorously account for age-related changes in lung function and are thus age-appropriate when establishing spirometric impairments, including a restrictive pattern and air-flow obstruction. However, GLI-defined spirometric impairments have not yet been evaluated regarding associations with static lung volumes (total lung capacity [TLC], functional residual capacity [FRC], and residual volume [RV]) and gas exchange (diffusing capacity)...
July 11, 2017: Respiratory Care
https://www.readbyqxmd.com/read/28696966/defining-a-ventilation-strategy-for-flexible-bronchoscopy-on-mechanically-ventilated-patients-in-the-medical-intensive-care-unit
#7
Yonatan Y Greenstein, Eric Shakespeare, Peter Doelken, Paul H Mayo
BACKGROUND: Flexible bronchoscopy (FB) in intubated patients on mechanical ventilation increases airway resistance. During FB, two ventilatory strategies are possible: maintaining tidal volume (VT) while maintaining baseline CO2 or allowing reduction of VT. The former strategy carries risk of hyperinflation due to expiratory flow limitation with FB. The aim of the authors was too study end expiratory lung volume (EELV) during FB of intubated subjects while limiting VT. METHODS: We studied 16 subjects who were intubated on mechanical ventilation and required FB...
July 2017: Journal of Bronchology & Interventional Pulmonology
https://www.readbyqxmd.com/read/28684597/dynamic-hyperinflation-and-exercise-limitations-in-obese-asthmatic-women
#8
Palmira Gabriele Ferreira, Patricia Duarte Freitas, Aline Grandi Silva, Desiderio Cano Porras, Rafael Stelmach, Alberto Cukier, Frederico Leon Arrabal Fernandes, Mílton A Martins, Celso R F Carvalho
Obese individuals and patients with asthma can develop dynamic hyperinflation (DH) during exercise; however, no previous study has investigated DH as a factor associated with reduced exercise capacity in obese asthmatic women. The aim of the present study was to examine the occurrence of DH and exercise limitations in obese asthmatics. Obese grade II (obese group (Ob-G); BMI 35-39.9 kg/m2; n=36) and non-obese (non-obese group (NOb-G); BMI 18.5-29.9 kg/m2; n=18) asthmatic patients performed a cardiopulmonary test to quantify peak VO2 and a submaximal exercise test to assess DH...
July 6, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28682006/air-trapping-in-early-cystic-fibrosis-lung-disease-does-ct-tell-the-full-story
#9
Tim Rosenow, Kathryn Ramsey, Lidija Turkovic, Conor P Murray, L Clara Mok, Graham L Hall, Stephen M Stick
INTRODUCTION: Mosaic attenuation on expiratory chest computed tomography (CT) is common in early life cystic fibrosis (CF) and often referred to as "air trapping". It is presumed to be localized hyperinflation due to small airway obstruction. In order to test this assumption, we compared air trapping extent to lung volumes measured on CT in young children with CF. MATERIALS AND METHODS: Children aged below 7 years undergoing inspiratory/expiratory CT were recruited from the Australian Respiratory Early Surveillance Team for Cystic Fibrosis cohort...
July 6, 2017: Pediatric Pulmonology
https://www.readbyqxmd.com/read/28671937/clinical-model-of-exercise-related-dyspnea-in-adult-patients-with-cystic-fibrosis
#10
Daniel Stevens, Heather F Neyedli
PURPOSE: Dyspnea is a highly distressing symptom of pulmonary disease that can make performing physical activities challenging. However, little is known regarding the strongest predictors of exercise-related dyspnea in adult cystic fibrosis (CF). Therefore, the purpose of the present study was to determine the best clinical model of exercise-related dyspnea in this patient group. METHODS: A retrospective analysis of pulmonary function and cardiopulmonary exercise testing data from patients with CF being followed up at the Adult CF Program at St Michael's Hospital, Toronto, Canada, from 2002 to 2008 were used for the analysis...
June 30, 2017: Journal of Cardiopulmonary Rehabilitation and Prevention
https://www.readbyqxmd.com/read/28662942/secretion-clearance-strategies-in-australian-and-new-zealand-intensive-care-units
#11
George Ntoumenopoulos, Naomi Hammond, Nicola R Watts, Kelly Thompson, Gabrielle Hanlon, Jennifer D Paratz, Peter Thomas
INTRODUCTION/AIMS: To describe the processes of care for secretion clearance in adult, intubated and mechanically ventilated patients in Australian and New Zealand Intensive Care Units (ICUs). METHODS/RESULTS: A prospective, cross-sectional study was conducted through the Australian and New Zealand Intensive Care Society Clinical Trials Group (ANZICS CTG) Point Prevalence Program. Forty-seven ICUs collected data from 230 patients intubated and ventilated on the study day...
June 26, 2017: Australian Critical Care: Official Journal of the Confederation of Australian Critical Care Nurses
https://www.readbyqxmd.com/read/28655742/respiratory-sensations-in-dynamic-hyperinflation-physiological-and-clinical-applications
#12
REVIEW
Morgan I Soffler, Margaret M Hayes, Richard M Schwartzstein
Dynamic hyperinflation is a common cause of dyspnea and functional limitation in patients with emphysema. Dynamic hyperinflation occurs in individuals with air-flow limitation when expiratory time is decreased during periods of relative tachypnea (such as during exercise or agitation, for example). In this setting, patients with emphysema develop lung hyperinflation, impairment of inspiratory respiratory muscles, and an increase in work of breathing. The associated decrease in inspiratory capacity results in the stimulation of several receptors, including chemoreceptors and pulmonary receptors, which signal the brain to increase tidal volume...
June 27, 2017: Respiratory Care
https://www.readbyqxmd.com/read/28617166/challenges-in-providing-timely-physiotherapy-and-opportunities-to-influence-outcomes-for-potential-lung-donors
#13
Cassandra Raios, Jenny L Keating, Nicola Stitt, Helen I Opdam, Elizabeth H Skinner
CONTEXT: There is a critical shortage of donor lungs however, considerable ethical considerations are associated with the conduct of research to optimize care of the potential organ donor. OBJECTIVE: To investigate pathways of consent, respiratory care by physiotherapists and donation rates to contextualize future research on physiotherapy effects on donor lung suitability for procurement. DESIGN: Retrospective audit. SETTING: Australian tertiary hospital...
June 2017: Progress in Transplantation
https://www.readbyqxmd.com/read/28615308/mechanisms-measurement-and-management-of-exertional-dyspnoea-in-asthma-number-5-in-the-series-exertional-dyspnoea-edited-by-pierantonio-laveneziana-and-piergiuseppe-agostoni
#14
Jason Weatherald, M Diane Lougheed, Camille Taillé, Gilles Garcia
Asthma is a heterogeneous condition, with dyspnoea during exercise affecting individuals to a variable degree. This narrative review explores the mechanisms and measurement of exertional dyspnoea in asthma and summarises the available evidence for the efficacy of various interventions on exertional dyspnoea. Studies on the mechanisms of dyspnoea in asthma have largely utilised direct bronchoprovocation challenges, rather than exercise, which may invoke different physiological mechanisms. Thus, the description of dyspnoea during methacholine challenge can differ from what is experienced during daily activities, including exercise...
June 30, 2017: European Respiratory Review: An Official Journal of the European Respiratory Society
https://www.readbyqxmd.com/read/28614400/emphysema-in-active-farmer-s-lung-disease
#15
Thibaud Soumagne, Marie-Laure Chardon, Gaël Dournes, Lucie Laurent, Bruno Degano, François Laurent, Jean Charles Dalphin
BACKGROUND: Farmer's lung (FL) is a common type of hypersensitivity pneumonitis. It is often considered that fibrosis is the most frequent finding in chronic FL. Nevertheless, three cohort studies have suggested that some patients with chronic FL may develop emphysema. We aimed to evaluate the current prevalence of emphysema in active FL, to describe the radiological and functional features of emphysema in active FL, and to identify risk factors associated with emphysema in this population...
2017: PloS One
https://www.readbyqxmd.com/read/28604095/anesthetic-management-using-a-laryngeal-mask-airway-in-a-child-with-congenital-bronchial-atresia
#16
Yuki Gomi, Asuka Taguchi, Sahoko Matsunari, Taisuke Iwamoto, Yui Kawamoto, Satoshi Tachikawa, Rikuo Masuda, Kinuko Gotoh, Takehiko Iijima
Congenital bronchial atresia is a relatively rare malformation that causes a segmental obstruction of the bronchus during the fetal period. The peripheral lung distal from the obstructed bronchus becomes hyperinflated because of the unidirectional flow through collateral check-valve entry. Positive pressure ventilation during general anesthesia may cause a rupture of the bulla, resulting in pneumothorax. An 8-year-old girl, who had to undergo oral surgery, was diagnosed as having congenital bronchial atresia and one-fifth of her lung was poorly ventilated...
2017: Anesthesia Progress
https://www.readbyqxmd.com/read/28586146/locating-the-level-and-extent-of-congenital-high-airway-obstruction-fluid-in-the-airway-tract-as-reference-points
#17
Mamatha Gowda, Shilpa Gupta, Ashraf Ali, Shanthi Paranthaman
Described here are a series of four cases of congenital high airway obstruction in the fetus. All of the patients presented in the second trimester and all had hydrops fetalis. Three cases had bilateral hyperinflated lungs, midline shift of heart, flattening or inversion of the diaphragm, and fetal ascites. Autopsy was performed in one of these three and showed laryngeal atresia. In one fetus, there was only a unilateral huge enlargement of the lung with mediastinal shift. On autopsy, this fetus had atresia of right main bronchus...
June 6, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28583413/effect-of-pulmonary-hyperinflation-on-central-blood-volume-an-mri-study
#18
Tanja Mijacika, Kasper Kyhl, Daria Frestad, F Otto Barak, Ivan Drvis, Niels H Secher, Zeljko Dujic, Per Lav Madsen
Pulmonary hyperinflation attained by glossopharyngeal insufflation (GPI) challenges the circulation by compressing the heart and pulmonary vasculature. Our aim was to determine the amount of blood translocated from the central blood volume during GPI. Cardiac output and cardiac chamber volumes were assessed by magnetic resonance imaging in twelve breath-hold divers at rest and during apnea with GPI. Pulmonary blood volume was determined from pulmonary blood flow and transit times for gadolinium during first-pass perfusion after intravenous injection...
September 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28579768/clinical-characteristics-of-copd-patients-with-tidal-expiratory-flow-limitation
#19
James Dean, Umme Kolsum, Paul Hitchen, Vandana Gupta, Dave Singh
We have used impulse oscillometry to identify COPD patients with tidal expiratory flow limitation (EFL), which is a measurement related to small airway disease. We report that 37.4% of COPD patients had EFL; these patients had multiple clinical characteristics of more severe disease including lower forced expiratory volume in 1 second values, greater hyperinflation, reduced exercise performance, and increased small airway impairment. We highlight that EFL can be used to identify a subgroup of COPD patients with distinct characteristics associated with small airway disease...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28579149/assessment-of-dyspnea-and-dynamic-hyperinflation-in-male-patients-with-chronic-obstructive-pulmonary-disease-during-a-six-minute-walk-test-and-an-incremental-treadmill-cardiorespiratory-exercise-test
#20
M Alfonso, V Bustamante, P Cebollero, M Antón, S Herrero, J B Gáldiz
The six minute walk test (6MWT) is a standardized test that provides information on exercise capacity in patients with COPD. It is considered a submaximal test in opposition to incremental cardiopulmonary exercise tests (CPET) that provide valuable information on all the systems involved in exercise. OBJECTIVES: 1. To compare the perceptive, physiological responses and degree of dynamic hyperinflation during two exercise tests: the 6MWT and the incremental CPET on a treadmill. 2. To evaluate how dyspnea is related to dynamic hyperinflation (DH) and other functional parameters in both tests...
June 1, 2017: Revista Portuguesa de Pneumologia
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