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Journal of Breath Research

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https://www.readbyqxmd.com/read/28649974/utility-of-sup-13-sup-c-methacetin-breath-test-in-predicting-long-term-survival-of-patients-with-decompensated-cirrhosis
#1
Segundo Moran, Aline Mina, Ximena Duque, Nayeli Ortiz-Olvera, Gustavo Rodríguez-Leal, Jose Sierra-Ramirez, Roberto Medina, Robertino Mera, Misael Uribe
The 13C-methacetin breath test (13C-MeBT) is a noninvasive tool that allows evaluation of the functional activity of the liver and the prediction of liver cirrhosis. Nevertheless, there is no information on its potential utility to predict long-term survival in patients with liver disease. Methods: Patients with cirrhosis were selected. All patients underwent a complete clinical assessment, standard biochemical tests, and 13C-MeBT at the beginning of the study. Death was recorded during the three years of follow-up...
June 26, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28649963/the-effect-of-growth-medium-on-i-escherichia-coli-i-pathway-mirrored-into-gc-ms-profiles
#2
Ileana Andreea Ratiu, Tomasz Ligor, Victor Bocos-Bintintan, Hossam Al-Suod, Tomasz Kowalkowski, Katarzyna Rafińska, Boguslaw Buszewski
Escherichia coli (E. coli) is a gram-negative coliform bacterium that is commonly found in the lower intestine of warm-blooded organisms. Most of the strains are harmless, but some serotypes are pathogenic, meaning they can cause illness, either diarrhea or illness outside of the intestinal tract. The aim of this work was to assess which components are generated in case of E. coli target analysis needed. In this purpose our study intends to emphasize the importance of the cultivability and to prove the crucial role of growth media used in bacteria growing...
June 26, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28649095/the-detection-of-hepatocellular-carcinoma-hcc-from-patients-breath-using-canine-scent-detection-proof-of-concept-study
#3
Taya Kitiyakara, Susan Redmond, Nattawut Unwanatham, Sasivimol Rattanasiri, Ammarin Thakkinstian, Pongsatorn Tangtawee, Somkit Mingphruedhi, Abhasnee Sobhonslidsuk, Pongphob Intaraprasong, Chomsri Kositchaiwat
Patients with hepatocellular carcinomas (HCC) have poor outcomes as a result of late detection of disease. We investigated the possibility of using smell detection by dogs for detecting HCC from breaths of patients. Patients' whose diagnosis of HCC was confirmed histologically or radiologically according to the American Association for the study of the Liver (AASLD) criteria had breaths collected using facemasks and transported to the study test site. One golden retriever was trained to detect HCC with positive feedback using known samples of HCC and healthy controls in a step-wise manner...
June 26, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28635619/on-the-importance-of-accurate-quantification-of-individual-volatile-metabolites-in-exhaled-breath
#4
David Smith, Patrik Spanel
It is argued that shortcomings of certain approaches to breath analysis research based on superficial interpretation of non-quantitative data are inadvertently inhibiting the progression of non-invasive breath analysis into clinical practice. The objective of this perspective is to suggest more clinically profitable approaches to breath research. Thus, following a discourse on the challenges and expectations in breath research, a brief indication is given of the analytical techniques currently used for the analysis of very humid exhaled breath...
June 21, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28631618/exhaled-carbon-monoxide-is-correlated-with-ischemia-reperfusion-injuries-during-ex-vivo-lung-perfusion-in-pigs
#5
Maxime Maignan, Stéphane Gennai, Guillaume Debaty, Daniele Romanini, Marie Hélène Schmidt, Vivien Brenckmann, Angélique Brouta, Irène Ventrillard, Raphael Briot
Measurement of exhaled carbon monoxide (eCO) might help in the selection of lung grafts during ex vivo lung perfusion since its endogenous production is increased under ischemia reperfusion. The objective of this study was to measure eCO variations depending on the extent of lung ischemia reperfusion injuries. Using a porcine model and a laser spectrometer instrument, eCO was measured during ex vivo lung perfusion. eCO was compared after 30 min (D0) or 24 h (D1) of cold ischemia. The ability of eCO to distinguish lungs deemed suitable for transplantation was evaluated...
June 20, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28612760/effects-of-growth-and-aging-on-the-reference-values-of-pulmonary-nitric-oxide-dynamics-in-healthy-subjects
#6
Marieann Högman, Alexandra Thornadtsson, Per Liv, Thong Hua-Huy, Anh-Tuan Dinh-Xuan, Ellen Tufvesson, Holger Dressel, Christer Janson, Kirsi Koskela, Panu Oksa, Riitta Sauni, Jukka Uitti, Eeva Moilanen, Lauri Lehtimäki
The lung just like all other organs is affected by age. The lung matures by the age of 20 and age related changes starts around middle age, 40-50 years. Exhaled nitric oxide (F<sub></sub>E<sub></sub>NO) has been shown to be age, height and gender dependent. We hypothesize that the nitric oxide (NO) parameters alveolar NO (C<sub>A</sub>NO), airway flux (J<sub>aw</sub>NO), airway diffusing capacity (D<sub>aw</sub>NO) and airway wall content (C<sub>aw</sub>NO), will also demonstrate this dependence...
June 14, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28592704/the-added-value-of-exhaled-breath-temperature-in-respiratory-medicine
#7
Todor A Popov, Tanya Kralimarkova, Marina Labor, Davor Plavec
Recognition of the huge economic burden chronic respiratory diseases pose for society motivated fundamental and clinical research leading to insight into the role of airway inflammation in various disease entities and their phenotypes. However, no easy, cheap and patient-friendly methods to assess it have found a place in routine clinical practice. Measurement of exhaled breath temperature (EBT) has been suggested as a non-invasive method to detect inflammatory processes in the airways as a result of increased blood flow within the airway walls...
June 8, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28585921/detection-of-lung-cancer-in-exhaled-breath-with-electronic-nose-using-support-vector-machine-analysis
#8
Madara Tirzīte, Māris Bukovskis, Gunta Strazda, Normunds Jurka, Immanuels Taivans
Lung cancer is one of the most common malignancies with a low five-year survival rate. There are no cheap, simple and widely available screening methods for early diagnostics of lung cancer. The aim of the study was to determine whether analysis of the exhaled breath with an artificial olfactory sensor using support vector analysis can differentiate lung cancer patients from healthy individuals and patients with other lung diseases regardless of the stage of lung cancer and the most common comorbidities...
June 6, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28579561/normal-values-of-offline-exhaled-and-nasal-nitric-oxide-in-healthy-children-and-teens-using-chemiluminescence
#9
Awen Menou, Diane Babeanu, Henry-Nicolas Paruit, Aline Ordureau, Sophie Guillard, Arnaud Christian Chambellan
Nitric oxide (NO) can be used to detect respiratory or ciliary diseases. Fractional exhaled nitric oxide (FeNO) measurement can reflect ongoing eosinophilic airway inflammation and has a diagnostic utility as a test for asthma screening and follow-up while nasal nitric oxide (nNO) is a valuable screening tool for the diagnosis of Primary Ciliary Dyskinesia (PCD). The possibility to collect airway gas samples in an offline manner offers the advantage to extend these measures and improve the screening and management of these diseases, but normal values from healthy children and teens remain sparse...
June 5, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28566556/estimation-of-clinical-parameters-of-chronic-kidney-disease-ckd-by-exhaled-breath-full-scan-mass-spectrometry-data-and-iterative-pca-with-intensity-screening-ips-algorithm
#10
Maggie Haitian Wang, Steven Y F Lau, Ka Chun Chong, Chloe Kwok, Maria Lai, Hau Yin Chung, Chung Shun Ho, Cheuk Chun Szeto, Benny Zee
Breath mass spectrometry is a useful tool for identifying important compounds associated with health. However, there have been few studies that explored human exhaled breath by full-scan mass spectrometry as a non-invasive method for medical diagnosis, which may be attributed to the difficulties resulting from multicollinearity and small sample sizes relative to a large number of product ions. In this study, breath samples from 54 chronic kidney disease patients were analyzed by selected ion flow tube mass spectrometry (SIFT-MS) in the full-scan mode...
June 1, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28439048/faecal-volatile-organic-compounds-analysis-using-field-asymmetric-ion-mobility-spectrometry-non-invasive-diagnostics-in-paediatric-inflammatory-bowel-disease
#11
Nora van Gaal, Rozanne Lakenman, James Covington, Richard Savage, Evelien de Groot, Marije Bomers, Marc Benninga, Chris Mulder, Nanne de Boer, Tim de Meij
Inflammatory bowel disease (IBD), including Crohn's disease (CD) and ulcerative colitis (UC), remains challenging to diagnose. Diagnostic work up carries a high burden, especially in paediatric patients, due to invasive endoscopic procedures. IBD is associated with alterations in intestinal microbiota composition. Faecal volatile organic compounds (VOCs) reflect gut microbiota composition. Aim of this study was to assess the diagnostic accuracy of faecal VOC profiling as non-invasive diagnostic biomarker for paediatric IBD...
April 25, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28424429/the-volatile-molecule-signature-of-four-mycobacteria-species
#12
Theodore Mellors, Christiaan Rees, Wendy Wieland-Alter, C Fordham von Reyn, Jane E Hill
Mycobacteria are the leading cause of death from infectious disease worldwide and limitations in current diagnostics are hampering control efforts. In recent years, the use of small volatile molecules as diagnostic biomarkers for mycobacteria has shown promise for use in the rapid analysis of in vitro cultures as well as ex vivo diagnosis using breath or sputum. In this study, 18 strains from four mycobacteria species (Mycobacterium avium, M. bovis BCG, M. intracellulare and M. xenopi) were analyzed for the first time using two-dimensional gas chromatography time-of-flight mass spectrometry (GC×GC-TOFMS)...
April 20, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28416775/volatile-organic-compounds-in-gastrointestinal-stromal-tumour-tissue-originating-from-patient-derived-xenografts
#13
Renata Wawrzyniak, Agnieszka Woźniak, Yemarshet Gebreyohannes, Bartosz Dykcik, Patrick Schöffski, Michal Markuszewski
Gastrointestinal stromal tumours (GIST) are the most common mesenchymal neoplasms of the gastrointestinal tract, localized mainly in the stomach or small intestine. The metabolomic signature of GIST signature associated with various mutations in KIT gene remains undiscovered and unexplored. The main aim of this pilot study was to determine and compare metabolomic profiles in GIST xenograft models with different genetic background. Metabolomic profiling using gas chromatography coupled with mass spectrometry followed by both univariate and multivariate statistical analyses was applied to select metabolites which differentiate the GIST models studied...
April 18, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28373602/data-analysis-of-electronic-nose-technology-in-lung-cancer-generating-prediction-models-by-means-of-aethena
#14
Sharina Kort, Marjolein Brusse-Keizer, Jan-Willem Gerritsen, Job van der Palen
INTRODUCTION: Only 15% of lung cancer cases present with potentially curable disease. Therefore, there is large interest in a fast, non-invasive tool to detect lung cancer earlier. Exhaled breath analysis by electronic nose technology measures volatile organic compounds (VOC's) in exhaled breath which are associated with lung cancer. METHODS: The diagnostic accuracy of the Aeonose™ is currently being studied in a multi-centre, prospective study in 210 subjects suspected for lung cancer, where approximately half will have a confirmed diagnosis and the other half will have a rejected diagnosis of lung cancer...
April 4, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28492183/evaluation-of-formula-see-text-enrichment-values-obtained-with-an-oral-breath-test-under-conditions-of-impaired-gastric-functioning
#15
J A Vogt, U Wachter, P Radermacher, M Georgieff, D König, W Fabinski, E Barth
Gastric emptying can be assessed by an oral administration of a (13)C labeled substrate and its response in the expiratory release of the oxidation product [Formula: see text]. Impaired gut function, reflected, for example, in an intolerance against enteral nutrition may delay or discontinue gastric emptying, potentially leading to multiple peaks in the time profile of expiration. The resulting profile cannot be analyzed by the usual data evaluation that is based on a 'beta exponential' (BEX) function. We developed a new approach that better reflects the underlying physiology...
June 12, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28473668/molecular-breath-analysis-identifies-the-breathprint-of-renal-failure
#16
Sevag Demirjian, Kelly M Paschke, Xiaofeng Wang, David Grove, Robert J Heyka, Raed A Dweik
Many uremic solutes retained in chronic kidney disease are volatile, and can be detected by breath testing. We compared the exhaled breath of subjects with end stage renal disease (ESRD) to healthy volunteers to identify volatile compounds that can serve as a potential breathprint for renal failure. We analyzed the exhaled breath of 86 ESRD subjects and 25 healthy volunteers using selected-ion flow-tube mass spectrometry (SIFT-MS). Using a random forests classification model, we identified three known volatiles (2-propanol, ammonia, acetaldehyde) and two unknown volatiles ([Formula: see text] NO(+)76) that were highly significant for discriminating individuals with renal failure from individuals without renal failure (C statistic > 0...
June 12, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28569242/-13-c-isotopic-abundances-in-natural-nutrients-a-newly-formulated-test-meal-for-non-invasive-diagnosis-of-type-2-diabetes
#17
Chiranjit Ghosh, Santanu Mandal, Mithun Pal, Prabuddha Mukhopadhyay, Shibendu Ghosh, Manik Pradhan
A new method to replace commercially prepared (13)C-labelled glucose with naturally available (13)C-enriched substrates could result in promotion of the clinical applicability of the isotopic breath test for detection of type 2 diabetes (T2D). Variation of the carbon-13 isotope in human breath depends on the (13)C enrichment in the diet taken by subjects. Here, we formulated a new test meal comprising naturally available (13)C-enriched foods and subsequently administered it to non-diabetic control (NDC) subjects and those with T2D...
June 1, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28569238/analyzing-breath-samples-of-hypoglycemic-events-in-type-1-diabetes-patients-towards-developing-an-alternative-to-diabetes-alert-dogs
#18
Amanda P Siegel, Ali Daneshkhah, Dana S Hardin, Sudhir Shrestha, Kody Varahramyan, Mangilal Agarwal
Diabetes is a disease that involves dysregulation of metabolic processes. Patients with type 1 diabetes (T1D) require insulin injections and measured food intake to maintain clinical stability, manually tracking their results by measuring blood glucose levels. Low blood glucose levels, hypoglycemia, can be extremely dangerous and can result in seizures, coma, or even death. Canines trained as diabetes alert dogs (DADs) have demonstrated the ability to detect hypoglycemia from breath, which led us to hypothesize that hypoglycemia, a metabolic dysregulation leading to low blood glucose levels, could be identified through analyzing volatile organic compounds (VOCs) contained within breath...
June 1, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28440225/observation-of-nonanoic-acid-and-aldehydes-in-exhaled-breath-of-patients-with-lung-cancer
#19
L Callol-Sanchez, M A Munoz-Lucas, O Gomez-Martin, J A Maldonado-Sanz, C Civera-Tejuca, C Gutierrez-Ortega, G Rodriguez-Trigo, J Jareno-Esteban
Lung cancer (LC) is the leading cause of cancer death in men and the second leading cause in women worldwide. The use of low-dose computed tomography in early diagnosis was shown to reduce mortality by 20% with a median follow-up time of 6.5 years. In order to increase profitability and reduce radiation risks and costs, exhaled biomarkers could serve to help establish narrower inclusion criteria. The aim of this study was to identify new, well-founded volatile organic compounds in exhaled breath which distinguish LC patients from chronic obstructive pulmonary disease (COPD) patients and healthy subjects...
April 25, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28397711/volatile-organic-compounds-in-exhaled-breath-are-independent-of-systemic-inflammatory-syndrome-caused-by-intravenous-lipopolysaccharide-infusion-in-humans-results-from-an-experiment-in-healthy-volunteers
#20
Anna L Peters, Marije G Gerritsen, Paul Brinkman, Koos A H Zwinderman, Alexander P J Vlaar, Lieuwe D Bos
Systemic inflammatory response syndrome (SIRS) is observed during critical illness in most patients. It is defined by a clinical definition. The composition of volatile organic compounds (VOCs) in exhaled breath may change during SIRS and may thus serve as a diagnostic tool. We investigated whether exhaled breath VOCs can serve as biomarker for SIRS in a human model of endotoxemia. Eighteen healthy volunteers received 2 ng Eschericia coli lipopolysaccharide (LPS) kg(-1) body weight intravenously. Venous blood and exhaled breath were collected before infusion of LPS and every 2 h thereafter, up to 8 h after infusion...
April 11, 2017: Journal of Breath Research
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