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Exhaled breath

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https://www.readbyqxmd.com/read/27919178/comparison-of-respiratory-inductive-plethysmography-versus-head-out-plethysmography-for-anesthetized-nonhuman-primates-in-an-animal-biosafety-level-4-facility
#1
J Kyle Bohannon, Anna N Honko, Rebecca J Reeder, Kurt Cooper, Russ Byrum, Laura Bollinger, Jens H Kuhn, Jiro Wada, Jing Qin, Peter B Jahrling, Matthew G Lackemeyer
For inhalational studies and aerosol exposures to viruses, head-out plethysmography acquisition has been traditionally used for the determination of estimated inhaled dose in anesthetized nonhuman primates prior to or during an aerosol exposure. A pressure drop across a pneumotachograph is measured within a sealed chamber during inspiration/exhalation of the nonhuman primate, generating respiratory values and breathing frequencies. Due to the fluctuation of depth of anesthesia, pre-exposure respiratory values can be variable, leading to less precise and accurate dosing calculations downstream...
December 5, 2016: Inhalation Toxicology
https://www.readbyqxmd.com/read/27913298/a-novel-monoclonal-antibody-suitable-for-the-detection-of-leukotriene-b4
#2
Steffi Lütkecosmann, Axel Warsinke, Winfried Tschöpe, Rüdiger Eichler, Katja Hanack
Leukotriene B4 as an inflammatory mediator is an important biomarker for different respiratory diseases like asthma, chronic obstructive pulmonary disease or cystic lung fibrosis. Therefore the detection of LTB4 is helpful in the diagnosis of these pulmonary diseases. However, until now its determination in exhaled breath condensates suffers from problems of accuracy. Reasons for that could be improper sample collection and preparation methods of condensates and the lack of consistently assay specificity and reproducibility of the used immunoassay detection system...
November 29, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27902490/detection-of-staphylococcus-aureus-in-cystic-fibrosis-patients-using-breath-voc-profiles
#3
A H Neerincx, B P Geurts, J van Loon, V Tiemes, J J Jansen, F J M Harren, L A J Kluijtmans, P J F M Merkus, S M Cristescu, L M C Buydens, R A Wevers
Staphylococcus aureus (S. aureus) is a common bacterium infecting children with cystic fibrosis (CF). Since current detection methods are difficult to perform in children, there is need for an alternative. This proof of concept study investigates whether breath profiles can discriminate between S. aureus infected and non-infected CF patients based on volatile organic compounds (VOCs). We collected exhaled breath of CF patients with and without S. aureus airways infections in which VOCs were identified using gas chromatography-mass spectrometry...
November 30, 2016: Journal of Breath Research
https://www.readbyqxmd.com/read/27891048/metabolic-signatures-of-lung-cancer-in-sputum-and-exhaled-breath-condensate-detected-by-1-h-magnetic-resonance-spectroscopy-a-feasibility-study
#4
Naseer Ahmed, Tedros Bezabeh, Omkar B Ijare, Renelle Myers, Reem Alomran, Michel Aliani, Zoann Nugent, Shantanu Banerji, Julian Kim, Gefei Qing, Zoheir Bshouty
OBJECTIVES: Lung cancer is one of the most lethal cancers. Currently, there are no biomarkers for early detection, monitoring treatment response, and detecting recurrent lung cancer. We undertook this study to determine if (1)H magnetic resonance spectroscopy (MRS) of sputum and exhaled breath condensate (EBC), as a noninvasive tool, can identify metabolic biomarkers of lung cancer. MATERIALS AND METHODS: Sputum and EBC samples were collected from 20 patients, comprising patients with pathologically confirmed non-small cell lung cancer (n = 10) and patients with benign respiratory conditions (n = 10)...
2016: Magnetic Resonance Insights
https://www.readbyqxmd.com/read/27889360/validation-of-the-exhaled-breath-temperature-measure-reference-values-in-healthy-subjects
#5
Giovanna E Carpagnano, Maria P Foschino-Barbaro, Corrado Crocetta, Donato Lacedonia, Valerio Saliani, Luigi Davide Zoppo, Peter J Barnes
BACKGROUND: Exhaled breath temperature (EBT) is a new non-invasive method for the study of inflammatory respiratory diseases with a potential to reach clinical practice. However, few studies, and mainly derived from small, paediatric populations, are available on the validation of the method and the range of normal values is not well established. The aim of this study was to measure EBT values in an Italian population of 298 (45.2±15.5 yrs, 143 male, FEV1 97.2±5.8%, FVC 98.4±3.9%) selected from 867 adult volunteers, in order to define reference values in healthy subjects and to analyse the influence of individual and external variables on this parameter...
November 23, 2016: Chest
https://www.readbyqxmd.com/read/27885813/a-novel-modelling-approach-to-energy-transport-in-a-respiratory-system
#6
Perumal Nithiarasu, Igor Sazonov
In this paper, energy transport in a respiratory tract is modelled using the finite element method for the first time. The upper and lower respiratory tracts are approximated as a one-dimensional domain with varying cross sectional and surface areas and the radial heat conduction in the tissue is approximated using the one dimensional cylindrical coordinate system. The governing equations are solved using one-dimensional linear finite elements with convective and evaporative boundary conditions on the wall...
November 24, 2016: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/27880043/mmp-8-mmp-9-and-neutrophil-elastase-in-peripheral-blood-and-exhaled-breath-condensate-in-copd
#7
JieHao Joshua Sng, Silvie Prazakova, Paul S Thomas, Cristan Herbert
Chronic obstructive pulmonary disease (COPD) is characterised by progressive and irreversible airflow limitation associated with chronic inflammation involving cytokines and metalloproteinases (MMPs). MMP-8, MMP-9 and neutrophil elastase (NE) are known to be implicated in COPD but the factors influencing activation and suppression remain unclear. This study aimed to compare MMP-8, MMP-9 and NE in the peripheral blood of COPD patients and controls and to likewise assess exhaled breath condensate (EBC) for these MMPs...
November 23, 2016: COPD
https://www.readbyqxmd.com/read/27871890/respiratory-dynamics-in-phonation-and-breathing-a-real-time-mri-study
#8
Louisa Traser, Ali Caglar Özen, Fabian Burk, Michael Burdumy, Michael Bock, Bernhard Richter, Matthias Echternach
The respiratory system is a central part of voice production, but for phonation neither the underlying functional relations between diaphragm (DPH) and rib cage (RC), nor differences to normal breathing are yet understood. This study aims to compare respiratory dynamics in phonation and breathing via dynamic MRI of the lung. Images of the breathing apparatus of 6 professional singers were captured in a 1.5T MRI system in supine position during vital capacity breathing and maximal long sustained phonation at 3 different pitches and loudness conditions...
November 18, 2016: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/27869108/limonene-in-exhaled-breath-is-elevated-in-hepatic-encephalopathy
#9
M E O'Hara, R Fernández Del Río, A Holt, P Pemberton, T Shah, T Whitehouse, C A Mayhew
Breath samples were taken from 31 patients with liver disease and 30 controls in a clinical setting and proton transfer reaction quadrupole mass spectrometry (PTR-Quad-MS) used to measure the concentration of volatile organic compounds (VOCs). All patients had cirrhosis of various etiologies, with some also suffering from hepatocellular cancer (HCC) and/or hepatic encephalopathy (HE). Breath limonene was higher in patients with No-HCC than with HCC, median (lower/upper quartile) 14.2 (7.2/60.1) versus 3.6 (2...
November 21, 2016: Journal of Breath Research
https://www.readbyqxmd.com/read/27869103/th-17-cytokines-and-interstitial-lung-involvement-in-systemic-sclerosis
#10
G Rolla, E Fusaro, S Nicola, C Bucca, C Peroni, S Parisi, M C Cassinis, A Ferraris, F Angelino, E Heffler, M Boita, L Brussino
The two phenotypes of both limited and diffuse systemic sclerosis (SSc) have different forms of pulmonary involvement: pulmonary arterial hypertension (limited phenotype) or interstitial lung disease (ILD) (diffuse phenotype). We aimed to investigate whether Th17-related cytokines, as measured in exhaled breath condensate (EBC) and in serum were connected to ILD in diffuse SSc patients. We found that for both limited and diffuse SSc, the EBC levels of all cytokines and most of the cytokine serum levels were significantly higher in patients than in controls, while, the EBC levels of Th-17 cytokines and the serum levels of IL-10 and TNF-α were significantly higher in diffuse than in limited SSc...
November 21, 2016: Journal of Breath Research
https://www.readbyqxmd.com/read/27867553/using-a-chemiresistor-based-alkane-sensor-to-distinguish-exhaled-breaths-of-lung-cancer-patients-from-subjects-with-no-lung-cancer
#11
Jiunn-Liang Tan, Zheng-Xin Yong, Chong-Kin Liam
BACKGROUND: Breath alkanes are reported to be able to discriminate lung cancer patients from healthy people. A simple chemiresistor-based sensor was designed to respond to alkanes by a change in resistance measured by a digital multimeter connected to the sensor. In preclinical experiments, the sensor response was found to have a strong positive linear relationship with alkane compounds and not responsive to water. This study aimed to determine the ability of the alkane sensor to distinguish the exhaled breaths of lung cancer patients from that of chronic obstructive pulmonary disease (COPD) patients and control subjects without lung cancer...
October 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/27856039/impact-of-real-time-image-gating-on-spot-scanning-proton-therapy-for-lung-tumors-a%C3%A2-simulation-study
#12
Takahiro Kanehira, Taeko Matsuura, Seishin Takao, Yuka Matsuzaki, Yusuke Fujii, Takaaki Fujii, Yoichi M Ito, Naoki Miyamoto, Tetsuya Inoue, Norio Katoh, Shinichi Shimizu, Kikuo Umegaki, Hiroki Shirato
PURPOSE: To investigate the effectiveness of real-time-image gated proton beam therapy for lung tumors and to establish a suitable size for the gating window (GW). METHODS AND MATERIALS: A proton beam gated by a fiducial marker entering a preassigned GW (as monitored by 2 fluoroscopy units) was used with 7 lung cancer patients. Seven treatment plans were generated: real-time-image gated proton beam therapy with GW sizes of ±1, 2, 3, 4, 5, and 8 mm and free-breathing proton therapy...
September 28, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27855548/markers-of-lipid-oxidative-damage-in-the-exhaled-breath-condensate-of-nano-tio2-production-workers
#13
Daniela Pelclova, Vladimir Zdimal, Petr Kacer, Nadezda Zikova, Martin Komarc, Zdenka Fenclova, Stepanka Vlckova, Jaroslav Schwarz, Otakar Makeš, Kamila Syslova, Tomas Navratil, Francesco Turci, Ingrid Corazzari, Sergey Zakharov, Dhimiter Bello
Nanoscale titanium dioxide (nanoTiO2) is a commercially important nanomaterial. Animal studies have documented lung injury and inflammation, oxidative stress, cytotoxicity and genotoxicity. Yet human health data are scarce and quantitative risk assessments and biomonitoring of exposure are lacking. NanoTiO2 is classified by IARC as a group 2B, possible human carcinogen. In our earlier studies we documented an increase in markers of inflammation, as well as DNA and protein oxidative damage, in exhaled breath condensate (EBC) of workers exposed nanoTiO2...
November 18, 2016: Nanotoxicology
https://www.readbyqxmd.com/read/27853412/significance-of-exhaled-breath-test-in-clinical-diagnosis-a-special-focus-on-the-detection-of-diabetes-mellitus
#14
REVIEW
Souvik Das, Saurabh Pal, Madhuchhanda Mitra
Analysis of volatile organic compounds (VOCs) emanating from human exhaled breath can provide deep insight into the status of various biochemical processes in the human body. VOCs can serve as potential biomarkers of physiological and pathophysiological conditions related to several diseases. Breath VOC analysis, a noninvasive and quick biomonitoring approach, also has potential for the early detection and progress monitoring of several diseases. This paper gives an overview of the major VOCs present in human exhaled breath, possible biochemical pathways of breath VOC generation, diagnostic importance of their analysis, and analytical techniques used in the breath test...
2016: Journal of Medical and Biological Engineering
https://www.readbyqxmd.com/read/27849432/monitoring-the-inhalation-flow-rate-of-nebulized-aerosols-using-an-ultrasonic-flow-meter-in-vitro-assessment
#15
Michael Y Yang, Hak-Kim Chan
BACKGROUND: The measurement of aerosol flow rates without obscuration of the flow is of particular concern with in vivo lung deposition studies, where precise knowledge of aerosol particle size distributions is a necessary requirement for the development of predictive correlations. This study examines the utility of an ultrasonic flow meter for such measurements and determines if a valved system can be attached to the flow meter for sampling exhaled aerosols. METHODS: The flow rate across a D-30 flow meter was compared with and without nebulization of 0...
November 16, 2016: Journal of Aerosol Medicine and Pulmonary Drug Delivery
https://www.readbyqxmd.com/read/27837378/nasal-nitric-oxide-improved-by-continuous-positive-airway-pressure-therapy-for-upper-airway-inflammation-in-obstructive-sleep-apnea
#16
Satoshi Hamada, Shuji Tatsumi, Yoshiki Kobayashi, Hirotaka Yasuba
PURPOSE: In this report, we examined the association between obstructive sleep apnea (OSA) and upper and lower airway inflammation based on nitric oxide (NO) measurements. METHODS: Study subjects included 51 consecutive participants. Sleep-disordered breathing was evaluated by a type 3 portable monitor and quantified by respiratory disturbance index (RDI). Airway inflammation was noninvasively analyzed by the measurement of nasally and orally exhaled NO; nasal value was presented as nasally exhaled NO minus orally exhaled NO...
November 12, 2016: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/27835856/respiratory-ocular-and-skin-health-in-recreational-and-competitive-swimmers-beneficial-effect-of-a-new-method-to-reduce-chlorine-oxidant-derivatives
#17
Anton Gomà, Rosó de Lluis, Jordi Roca-Ferrer, Javier Lafuente, César Picado
BACKGROUND: Chlorine by-products may irritate the eyes, nose, skin and airways of swimmers and may cause chronic airway inflammation. OBJECTIVE: To assess the salutary effects on swimmers health of a new method of water disinfection. METHODS: Recreational (n=320) and competitive swimmers (n=53) participated in the study. The first part of the study (Phase A) was carried out while using the current standard method. The second part (Phase B) began 8 weeks after the new method had been introduced...
January 2017: Environmental Research
https://www.readbyqxmd.com/read/27834896/development-of-an-exhaled-breath-monitoring-system-with-semiconductive-gas-sensors-a-gas-condenser-unit-and-gas-chromatograph-columns
#18
Toshio Itoh, Toshio Miwa, Akihiro Tsuruta, Takafumi Akamatsu, Noriya Izu, Woosuck Shin, Jangchul Park, Toyoaki Hida, Takeshi Eda, Yasuhiro Setoguchi
Various volatile organic compounds (VOCs) in breath exhaled by patients with lung cancer, healthy controls, and patients with lung cancer who underwent surgery for resection of cancer were analyzed by gas condenser-equipped gas chromatography-mass spectrometry (GC/MS) for development of an exhaled breath monitoring prototype system involving metal oxide gas sensors, a gas condenser, and gas chromatography columns. The gas condenser-GC/MS analysis identified concentrations of 56 VOCs in the breath exhaled by the test population of 136 volunteers (107 patients with lung cancer and 29 controls), and selected four target VOCs, nonanal, acetoin, acetic acid, and propanoic acid, for use with the condenser, GC, and sensor-type prototype system...
November 10, 2016: Sensors
https://www.readbyqxmd.com/read/27830528/real-time-quantitative-analysis-of-valproic-acid-in-exhaled-breath-by-low-temperature-plasma-ionization-mass-spectrometry
#19
Xiaoxia Gong, Songyue Shi, Gerardo Gamez
Real-time analysis of exhaled human breath is a rapidly growing field in analytical science and has great potential for rapid and noninvasive clinical diagnosis and drug monitoring. In the present study, an LTP-MS method was developed for real-time, in-vivo and quantitative analysis of γ-valprolactone, a metabolite of valproic acid (VPA), in exhaled breath without any sample pretreatment. In particular, the effect of working conditions and geometry of the LTP source on the ions of interest, protonated molecular ion at m/z 143 and ammonium adduct ion at m/z 160, were systematically characterized...
November 9, 2016: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/27826890/acute-response-to-cigarette-smoking-assessed-in-exhaled-breath-condensate-in-patients-with-chronic-obstructive-pulmonary-disease-and-healthy-smokers
#20
M Maskey-Warzęchowska, P Nejman-Gryz, K Osinka, P Lis, K Malesa, K Górska, R Krenke
The effect of acute exposure to cigarette smoke (CS) on the respiratory system has been less extensively studied than the long term effects of smoking. The aim of the present study was to evaluate the acute response to CS in smokers suffering from chronic obstructive pulmonary disease (COPD) and in healthy smokers. Nineteen stable COPD patients and 19 young healthy smokers were enrolled. Tumor necrosis factor alpha (TNF-α), IL-1β, and malondialdehyde (MDA) were measured in exhaled breath condensate (EBC) before and 60 min after smoking a cigarette...
2017: Advances in Experimental Medicine and Biology
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