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Journal articles on the topic 'Air exhalé'

Author: Grafiati

Published: 22 June 2024

Last updated: 31 July 2025

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1

Anderson, Joseph C., and Michael P. Hlastala. "The alcohol breath test in practice: effects of exhaled volume." Journal of Applied Physiology 126, no. 6 (2019): 1630–35. http://dx.doi.org/10.1152/japplphysiol.00726.2018.

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Alcohol breath test (ABT) measurements are sensitive to the volume of the exhaled breath. Although a minimum breath volume is required for a legally acceptable sample, any additional increase in the volume of exhaled air increases the measurement of breath alcohol concentration (BrAC). Using a sample of 115 ABTs collected by police agencies for evidentiary purposes, we studied the influence of exhaled air volume on the measurement of BrAC. The 115 ABTs were performed on 30 different Alcotest 9510s. Each of the tests included paired, time series measurements of exhaled breath flow rates and bre

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I Made Putra Arya Winata, Putu Emilia Dewi, Putu Brahmanda Sudarsana, and Made Sucipta. "Air-Flow Simulation in Child Respirator for Covid-19 Personal Protection Equipment Using Bamboo-Based Activated Carbon Filter." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 91, no. 1 (2022): 83–91. http://dx.doi.org/10.37934/arfmts.91.1.8391.

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The use of personal protective equipment during the Covid-19 pandemic may inhibit the social interaction and learning process of children. A child respirator that is suitable for children's growth and development has been developed. Its designing process was done by computer-aided design and validated by computational fluid dynamics simulation. The device consists of inhale and exhale system, face cover, and headband. Various air filter is embedded in the inhale system, such as prefilter, HEPA filter, and bamboo-based activated carbon filter. Meanwhile, the exhale system contains HEPA filter o

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Fachet, Melanie, Simon Lowitzki, Marie-Louise Reckzeh, Thorsten Walles, and Christoph Hoeschen. "Investigation of everyday influencing factors on the variability of exhaled breath profiles in healthy subjects." Current Directions in Biomedical Engineering 8, no. 2 (2022): 261–64. http://dx.doi.org/10.1515/cdbme-2022-1067.

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Abstract Introduction: The human breath is an accurate but complex read-out of many physiological processes in the organism that can be monitored via volatile organic compounds (VOCs) in the exhaled air. However, there are many confounding variables that limit the transfer and application of breath analysis to become a clinical procedure. Method: This work aims to establish a systematic procedure for sampling and characterization of various everyday influences of healthy subjects using proton transfer reaction-mass spectrometry (PTR-MS). In order to limit the influencing factors on the breath

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Ghosh, Nabarun, Shaily Goyal, Aubrey Howard, Prabir Banerjee, and Jay Vitale. "Application of Nanotechnology in a Novel Air Purifier for Remediation of Airborne Pathogen and to Prevent the Spread of COVID-19." European Scientific Journal, ESJ 19, no. 12 (2023): 1. http://dx.doi.org/10.19044/esj.2023.v19n12p1.

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The spread of COVID-19 occurs via airborne transmission. With a constant and variable spread of COVID-19, indoor air-quality has become a major concern all over the world. People who are infected with COVID can release particles and droplets of respiratory fluids that contain the SARS CoV-2 virus into the air when they exhale (e.g., quiet breathing, speaking, singing, exercise, coughing, sneezing). Once infectious droplets are exhaled, they move outward from the person (the source) into the surrounding environment; these droplets carry the virus and transmit infection. Indoors, the very fine d

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Ohkuwa, Tetsuo, Tatsuo Mizuno, Yuji Kato, Kazutoshi Nose, Hiroshi Itoh, and Takao Tsuda. "Effects of Hypoxia on Nitric Oxide (NO) in Skin Gas and Exhaled Air." International Journal of Biomedical Science 2, no. 3 (2006): 279–83. http://dx.doi.org/10.59566/ijbs.2006.2279.

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This study confirmed the effects of hypoxia on nitric oxide (NO) concentrations in skin gas and exhaled air. NO concentrations in skin gas and exhaled air were measured by a chemiluminescence analyzer. Arterial oxygen saturation (SpO2) of the right forefinger was determined using an oxygen saturation monitor. The M±SEM of NO concentrations in skin gas at 20.93% (control), 15.1% and 14.8% oxygen concentrations were 23.7±3.6, 32.3±4.7 and 36.2±5.2 ppb, respectively. M±SEM of NO concentrations in exhaled air at 20.93% (control), 15.1%, and 14.8% were 25.0±5.1, 35.01±5.6 and 44.9±7.2 ppb, respecti

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Jobsis, Q., HC Raatgeep, PW Hermans, and JC de Jongste. "Hydrogen peroxide in exhaled air is increased in stable asthmatic children." European Respiratory Journal 10, no. 3 (1997): 519–21. http://dx.doi.org/10.1183/09031936.97.10030519.

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Exhaled air condensate provides a noninvasive means of obtaining samples from the lower respiratory tract. Hydrogen peroxide (H2O2) in exhaled air has been proposed as a marker of airway inflammation. We hypothesized that in stable asthmatic children the H2O2 concentration in exhaled air condensate may be elevated as a result of airway inflammation. In a cross-sectional study, 66 allergic asthmatic children (of whom, 41 were treated with inhaled steroids) and 21 healthy controls exhaled through a cold trap. The resulting condensate was examined fluorimetrically for the presence of H2O2. All su

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Wyszyńska, Magdalena, Monika Nitsze-Wierzba, Aleksandra Czelakowska, Jacek Kasperski, Joanna Żywiec, and Małgorzata Skucha-Nowak. "An Evidence-Based Review of Application Devices for Nitric Oxide Concentration Determination from Exhaled Air in the Diagnosis of Inflammation and Treatment Monitoring." Molecules 27, no. 13 (2022): 4279. http://dx.doi.org/10.3390/molecules27134279.

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The measurement of nitric oxide (NO) in exhaled air is used in diagnostics and monitoring the pathologies not only in the respiratory system but also in the oral cavity. It has shown a huge increase in its level in asthma and diseases of the oral cavity. It seems reasonable to undertake research on the impact of inflammation on the level of NO in exhaled air. The aim of the study is to make an evidence-based review of the application of NO levels in exhaled air in the diagnosis of inflammation and treatment monitoring on the basis of selected measuring devices. Methods and Results: This paper

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Zaitsev, A., N. Matsegora, S. Zaitsev, S. Kaminska, and V. Тikhenko. "APPLICATION OF GAS CHROMATOGRAPHY METHODS FOR ANALYSIS OF EXHALED AIR BY PATIENTS WITH RESPIRATORY DISEASES." Odes’kyi Politechnichnyi Universytet Pratsi 2, no. 64 (2021): 52–60. http://dx.doi.org/10.15276/opu.2.64.2021.07.

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. Improvement of gas chromatography methods for analyzing the exhaled air of patients when diagnosing the presence and development of pathologies of their respiratory organs is an urgent task. The aim of this work is to analyze proven and promising methods for monitoring the content of vaporous and (or) gaseous biological markers in the exhaled air of patients with respiratory pathologies, as well as the choice of optimal measurement techniques using gas chromatography methods. The analysis of scientific researches and publications in the field of modern methods of control of the content of va

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Hui, David S., Benny K. Chow, Thomas Lo, et al. "Exhaled air dispersion during high-flow nasal cannula therapy versus CPAP via different masks." European Respiratory Journal 53, no. 4 (2019): 1802339. http://dx.doi.org/10.1183/13993003.02339-2018.

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BackgroundHigh-flow nasal cannula (HFNC) is an emerging therapy for respiratory failure but the extent of exhaled air dispersion during treatment is unknown. We examined exhaled air dispersion during HFNC therapy versus continuous positive airway pressure (CPAP) on a human patient simulator (HPS) in an isolation room with 16 air changes·h−1.MethodsThe HPS was programmed to represent different severity of lung injury. CPAP was delivered at 5–20 cmH2O via nasal pillows (Respironics Nuance Pro Gel or ResMed Swift FX) or an oronasal mask (ResMed Quattro Air). HFNC, humidified to 37°C, was delivere

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Zhuang, Hao, Zhijun Zou, Li Wang, et al. "Investigation of Air Change Rate in a Single Room Using Multiple Carbon Dioxide Breathing Models in China: Verification by Field Measurement." Buildings 13, no. 2 (2023): 459. http://dx.doi.org/10.3390/buildings13020459.

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It is difficult to accurately measure the air exchange rate (AER) in residential and office buildings during occupation via on-site field measurement. The tracer gas method was widely applied to estimate the AER in these buildings, and human metabolic carbon dioxide (CO2) was often used as a tracer gas in different models. This study introduced three models (the ASHRAE model, the ASHRAE China-specific modified model, and the BMR model), which were proposed to estimate the AER based on exhaled CO2. We verified these models by comparing the exhaled CO2-based AER with AER from field measurements

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Kotlyarov, Stanislav N., Igor’ A. Suchkov, Oleg M. Uryas’yev, and Elena A. Maksimtseva. "The Assessment of Exhaled Air Temperature in Patients with Different Course of Chronic Obstructive Pulmonary Disease." NAUKA MOLODYKH (Eruditio Juvenium) 11, no. 3 (2023): 336–44. http://dx.doi.org/10.23888/hmj2023113336-344.

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INTRODUCTION: Chronic obstructive pulmonary disease (COPD) is an important medical problem of modern society. COPD is characterized by a heterogeneous course due to individual trajectories of pulmonary function decline, differences in the frequency of exacerbations and comorbidity. The exhaled air temperature is a parameter associated with the activity of local inflammation in the respiratory tract in COPD and, accordingly, the nature of the course of the disease. AIM: To study peak values of exhaled air temperature in patients with heterogeneous COPD. MATERIALS AND METHODS: The exhaled air te

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Alving, K., E. Weitzberg, and JM Lundberg. "Increased amount of nitric oxide in exhaled air of asthmatics." European Respiratory Journal 6, no. 9 (1993): 1368–70. http://dx.doi.org/10.1183/09031936.93.06091368.

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The presence of nitric oxide (NO) in the exhaled air of humans has recently been described. We wanted to assess at what level exhaled NO originates in normal airways, and to determine whether airway inflammation induces changes in the levels of exhaled NO. Exhaled NO was continuously measured by chemiluminescence technique during normal tidal breathing through the nose or mouth, with a detection limit of 1 part per billion (ppb). Twelve control subjects were compared to eight patients with mild atopic asthma and rhinitis caused by occupational allergen. In control subjects, the major part of N

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Fojtík, P., J. Hůlka, P. Bartl, et al. "RADON INHALATION EXPERIMENTS TO TEST RADON EXHALATION KINETICS." Radiation Protection Dosimetry 191, no. 2 (2020): 176–80. http://dx.doi.org/10.1093/rpd/ncaa144.

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Abstract Three experiments were conducted with a volunteer to test the kinetics of the 222Rn exhalation after a shorttime exposure to an elevated 222Rn air concentration. Radon concentration in an exhaled air was measured, complemented by whole body counting of 222Rn decay products in a body. Exhaled activities are compared with the prediction of the recent ICRP biokinetic model for radon. While a rapid equilibration of the exhaled radon activity concentration with that in the air inhaled corresponded with the model, the measured 222Rn exhalation rate was significantly less than modelled. Fiv

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Mazej, Mitja, and Vincenc Butala. "Investigation in the Characteristics of the Personal Ventilation Using Computational Fluid Dynamics." Indoor and Built Environment 21, no. 6 (2011): 749–71. http://dx.doi.org/10.1177/1420326x11420456.

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Detailed information of transient exhaled air dispersion and recirculation in the breathing zone can be obtained using computational fluid dynamics (CFD) to generate detailed numerical models and obtain the necessary information. In this study, interaction of free convection flow around human body with respiration flow of breathing and vertical personalized flow from personalized ventilation (PV) system was simulated using a commercial CFD package. Impact of breathing process on personal exposure effectiveness εp was evaluated for different operating and environmental conditions. Re-inhaled ex

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Lundberg, J. O. N., E. Weitzberg, J. M. Lundberg, and K. Alving. "Nitric oxide in exhaled air." European Respiratory Journal 9, no. 12 (1996): 2671–80. http://dx.doi.org/10.1183/09031936.96.09122671.

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Platonov, Igor A., Vladimir I. Platonov, Irina N. Kolesnichenko, et al. "Express analysis of acetone in exhaled air for diagnosing diabetes melli-tus." Сорбционные и хроматографические процессы 24, no. 2 (2024): 180–96. http://dx.doi.org/10.17308/sorpchrom.2024.24/12124.

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Exhaled air analysis is an actively developing area of medical non-invasive diagnostics, as it does not involve invasive interventions and can be performed repeatedly. It is known that acetone in exhaled air correlates with blood glucose and is a biomarker of diabetes. The use of analytical systems to analyse acetone in exhaled air in medical institutions will allow for the timely diagnosis of pathological changes in blood glucose levels, the early diagnosis of diabetes, and the monitoring of the effectiveness of treatments. In this study, we described the express analysis of acetone in exhale

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Wyszyńska, Magdalena, Aleksandra Czelakowska, Rafał Rój, et al. "Measurement of the Level of Nitric Oxide in Exhaled Air in Patients Using Acrylic Complete Dentures and with Oral Pathologies." Coatings 11, no. 2 (2021): 169. http://dx.doi.org/10.3390/coatings11020169.

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The measurement of nitric oxide (NO) in exhaled air is used in diagnostics and monitoring of the pathologies in the respiratory system but also in the oral cavity. Researchers have shown a huge increase of its level in asthma and diseases in the oral cavity. It seems reasonable to research the impact of pathologies in the oral cavity on the level of NO in exhaled air. The purpose of this study was to determine the impact of inflammation in the oral cavity (according to the material of dentures) on the level of nitric oxide in exhaled air. Three groups of patients were examined in this study. T

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Peters, Stefan, Angelika Kronseder, Stefan Karrasch, et al. "Hydrogen peroxide in exhaled air: a source of error, a paradox and its resolution." ERJ Open Research 2, no. 2 (2016): 00052–2015. http://dx.doi.org/10.1183/23120541.00052-2015.

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The concentration of hydrogen peroxide (H2O2) in exhaled air has been reported to be elevated in asthma and chronic obstructive pulmonary disease (COPD), but results are inconsistent and difficult to reproduce. As H2O2 occurs in ambient air, we examined its association with exhaled H2O2 in human subjects.Exhaled breath condensate (EBC) of 12 COPD patients and nine healthy control subjects was collected either with an inhalation filter (efficiency 81%) or without. Ambient air condensate (AAC) was collected in parallel and samples were analysed for H2O2. Additionally, ambient H2O2 was recorded b

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Westhoff, Michael, Maren Friedrich, and Jörg I. Baumbach. "Simultaneous measurement of inhaled air and exhaled breath by double multicapillary column ion-mobility spectrometry, a new method for breath analysis: results of a feasibility study." ERJ Open Research 8, no. 1 (2021): 00493–2021. http://dx.doi.org/10.1183/23120541.00493-2021.

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The high sensitivity of the methods applied in breath analysis entails a high risk of detecting analytes that do not derive from endogenous production. Consequentially, it appears useful to have knowledge about the composition of inhaled air and to include alveolar gradients into interpretation.The current study aimed to standardise sampling procedures in breath analysis, especially with multicapillary column ion-mobility spectrometry (MCC-IMS), by applying a simultaneous registration of inhaled air and exhaled breath.A “double MCC-IMS” device, which for the first time allows simultaneous anal

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Misnikova, Inna, Yulia Kovaleva, Svetlana Shokur, Tyler W. LeBaron, Oxana Povarova, and Oleg Medvedev. "Hydrogen and Methane Detection in Breath in Response to Two Different Types of Dietary Fiber and Its Relationship to Postprandial Glucose Concentration in Obese Patients with Type 2 Diabetes and Normoglycemic Subjects." Nutrients 17, no. 5 (2025): 917. https://doi.org/10.3390/nu17050917.

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Background: The aim of this study was to investigate the relationship between postprandial glycemic levels based on flashmonitoring and the production of intestinal hydrogen (H2) and methane (CH4) gases based on the measurement of the amount of these gases in exhaled air. Materials and Methods: We studied 14 subjects with type 2 diabetes mellitus (T2DM) and 14 individuals without diabetes (control) with two food load tests, including two types of dietary fiber (inulin and guar gum), with the simultaneous determination of gases in exhaled air and the assessment of glucose levels. Results: All s

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Vuong, Caroline, Paul Brinkman, Harriët Heijboer, et al. "Analysis of Volatile Organic Compounds in Exhaled Air in Patients with Sickle Cell Disease during Vaso-Occlusive Episodes." Blood 142, Supplement 1 (2023): 1131. http://dx.doi.org/10.1182/blood-2023-180835.

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Background: Sickle cell disease (SCD) is an inherited red blood cell disorder characterized by hemolytic anemia, inflammation and vaso-occlusion. Due to the process of vaso-occlusion patients with SCD experience unpredictable and painful vaso-occlusive episodes (VOE), causing stress and disruption of daily life. To date, we lack adequate markers to predict the development of a VOE before it occurs. In other conditions such as asthma, exhaled air analyses have shown to be of diagnostic value and may predict exacerbations. In the human body, metabolic processes generate volatile organic compound

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Кистенев, Ю. В., А. В. Тетенева, Т. В. Сорокина та ін. "Диагностика диабета на основе анализа выдыхаемого воздуха методом терагерцовой спектроскопии и машинного обучения". Журнал технической физики 128, № 6 (2020): 805. http://dx.doi.org/10.21883/os.2020.06.49414.46-20.

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The results of a study of the exhaled air of patients with diabetes mellitus in comparison with healthy volunteers using broadband time-domain THz spectroscopy are presented. Characteristic spectral sub-bands were identified, in which the profiles of the absorption spectra of exhaled air samples of the target and control groups differ most significantly: 0.56, 0.738, 0.97, 1.07, 1.14, 1.18, 1.4 THz. The results of the principal component analysis showed that the set of absorption coefficients in these spectral sub-bands allows us to separate the target and control groups reliably. The results

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Anatychuk, L. I., R. R. Kobylianskyi, and V. V. Lysko. "Computer design of a thermoelectric pulmonary air condenser for the diagnostics of coronavirus and other diseases." Journal of Thermoelectricity, no. 1 (March 25, 2023): 55–65. https://doi.org/10.63527/1607-8829-2023-1-55-65.

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The physical model of a thermoelectric device for collecting exhaled air condensate is considered. By means of computer simulation, the distribution of temperature and velocity of air movement in the working chamber of the device was determined depending on the temperature of the working chamber, as well as humidity, temperature and volume of exhaled air. The results of calculations of the cooling efficiency of thermoelectric modules, necessary to ensure the specified modes of operation of the device, are given.

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Schulze-König, Tim, Lukas Wacker, and Hans-Arno Synal. "Direct radiocarbon analysis of exhaled air." J. Anal. At. Spectrom. 26, no. 2 (2011): 287–92. http://dx.doi.org/10.1039/c0ja00039f.

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Chen, Jery, Noni Novisari Soeroso, Syamsul Bihar, and Lambok Siahaan. "Correlation Between Carbon Monoxide Level In Exhaled Air and Pulmonary Function On Grill Street-Vendors In Medan City." Journal of Endocrinology, Tropical Medicine, and Infectious Disease (JETROMI) 3, no. 3 (2021): 85–90. http://dx.doi.org/10.32734/jetromi.v3i3.6382.

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Background. Air pollution is the result of household waste responsible for 3.8 million death and 7.7% of all mortality over the world. One air pollutant which tends to increase year by year is carbon monoxide (CO). CO is produced as the result of the imperfect combustion of machines and the combustion of charcoal. The purpose of this study is to assess the correlation between CO level in exhaled air and pulmonary function on grill street-vendors in Medan city. Method: This study is an observational analytic with a cross-sectional approach. The subjects were grill in Medan city who fulfilled ce

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Lammers, Ariana, Anne H. Neerincx, Susanne J. H. Vijverberg, et al. "The Impact of Short-Term Exposure to Air Pollution on the Exhaled Breath of Healthy Adults." Sensors 21, no. 7 (2021): 2518. http://dx.doi.org/10.3390/s21072518.

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Environmental factors, such as air pollution, can affect the composition of exhaled breath, and should be well understood before biomarkers in exhaled breath can be used in clinical practice. Our objective was to investigate whether short-term exposures to air pollution can be detected in the exhaled breath profile of healthy adults. In this study, 20 healthy young adults were exposed 2–4 times to the ambient air near a major airport and two highways. Before and after each 5 h exposure, exhaled breath was analyzed using an electronic nose (eNose) consisting of seven different cross-reactive me

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Bivolarova, Mariya P., Wojciech Kierat, Signe Hvidkjær, et al. "Reduced personal exposure to airborne cross-infection using wearable exhaust ventilation." E3S Web of Conferences 396 (2023): 02032. http://dx.doi.org/10.1051/e3sconf/202339602032.

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This study aimed to explore an alternative solution for protection against cross-infection. Exposure reduction to exhaled airborne contaminants by wearing an exhaust nozzle was studied. Experiments were performed in a full-scale test room (64.8 m3) equipped with a small section of a stadium tribune with six seats. Two breathing thermal manikins and four heated dummies were placed on the tribune. The manikins were equipped with artificial lungs simulating a realistic breathing cycle and respiratory flow. One of the breathing manikins was used to mimic a sick person having an infectious respirat

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Vyshnavi, Somana B., M. Shanthi, V. C. Divya, C. Ganesh, Shreya Gupta, and Korukonda Jayavardhan. "Measurement of Exhaled Carbon Monoxide Levels in Patients Visiting to Dental Hospitals." Journal of Indian Academy of Oral Medicine and Radiology 36, no. 3 (2024): 292–96. https://doi.org/10.4103/jiaomr.jiaomr_52_24.

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Abstract Background: Nowadays, analyzing the amount of carbon monoxide in exhaled air is a commonly used method in population research and useful as a quantitative breathing guide and for verifying claims of not smoking. The primary and most prevalent indoor source of carbon monoxide is cigarette smoke. Objectives: To measure exhaled carbon monoxide levels in order to assess individual smoking status. Materials and Methods: An instantaneous, noninvasive way to determine smoking status may be offered by measuring carbon monoxide exhaled. A carbon monoxide analyzer or smoke analyzer (md diagnost

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Jöbsis, Rijn Q., Susanne L. Schellekens, Anoeska Fakkel-Kroesbergen, Rolien H. C. Raatgeep, and Johan C. de Jongste. "Hydrogen peroxide in breath condensate during a common cold." Mediators of Inflammation 10, no. 6 (2001): 351–54. http://dx.doi.org/10.1080/09629350120102398.

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Background:Hydrogen peroxide (H2O2) in exhaled air condensate is elevated in inflammatory disorders of the lower respiratory tract. It is unknown whether viral colds contribute to exhaled H2O2.Aim:To assess exhaled H2O2during and after a common cold.Methods:We examined H2O2in the breath condensate of 20 normal subjects with acute symptoms of a common cold and after recovery 2 weeks later and, similarly, in 10 subjects without infection. H2O2was measured with a fluorimetric assay.Results:At the time of infection exhaled H2O2(median, ranges) was 0.20 μM (0.03-1.2 μM), and this decreased to 0.09

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Ziener, Chris-Elmo, and Pia-Paulin Braunsdorf. "Trace Analysis in End-Exhaled Air Using Direct Solvent Extraction in Gas Sampling Tubes: Tetrachloroethene in Workers as an Example." International Journal of Analytical Chemistry 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/904512.

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Simple and cost-effective analytical methods are required to overcome the barriers preventing the use of exhaled air in routine occupational biological monitoring. Against this background, a new method is proposed that simplifies the automation and calibration of the analytical measurements. End-exhaled air is sampled using valveless gas sampling tubes made of glass. Gaseous analytes are transferred to a liquid phase using a microscale solvent extraction performed directly inside the gas sampling tubes. The liquid extracts are analysed using a gas chromatograph equipped, as usual, with a liqui

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Pashchenko, Alexander A., Yulia E. Dobrokhotova, and Daria S. Fomina. "To study the level of nitric oxide in exhaled air in pregnant women with bronchial asthma as a monitoring of disease control and prediction of asthma-associated obstetric complications: Observational comparative study." Gynecology 26, no. 2 (2024): 171–75. http://dx.doi.org/10.26442/20795696.2024.2.202689.

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Aim. To determine the clinical significance of the level of nitric oxide in exhaled air (NOex) for optimizing the control of bronchial asthma (BA) in pregnant women in order to reduce asthma-associated obstetric complications. Materials and methods. A cohort comparative study was conducted with the participation of 80 pregnant women in the third trimester of pregnancy against the background of asthma with varying degrees of severity and level of control, with an assessment of the frequency of asthma-associated obstetric complications. The main group consisted of 40 patients with a prospective

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Hadi, Kasnawi Al, Arif Budianto, Sabila Alhadawiah, Karina Alma Fidya, and Satutik Rahayu. "VOCs (Volatile Organic Compounds) Concentration Measurement in Human-Exhaled Breath - A Preliminary Study." JURNAL SAINS TEKNOLOGI & LINGKUNGAN 10, no. 4 (2024): 618–22. https://doi.org/10.29303/jstl.v10i4.728.

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VOC is a group of organic compounds that easily evaporate into the atmosphere and have various impacts on human health and the environment. Human exhaled breath and VOC is related to each other. The concentration of VOC differs from an abnormal condition to other abnormalities. However, there is limited information or study about VOC concentration in human exhaled breath. In line with this, this study aims to develop a VOC meter or a measurement system using a CCS811 sensor for human exhaled breath. This study used a CCS811 sensor, a microcontroller, and a suction pump installed inside a senso

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Kulbakin, D. E., E. L. Choinzonov, I. K. Fedorova, et al. "Optimization of upper respiratory tract cancer diagnosis method based on exhaled breath gas analysis." Head and Neck Tumors (HNT) 14, no. 3 (2024): 14–21. http://dx.doi.org/10.17650/2222-1468-2024-14-3-14-21.

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Introduction. Head and neck tumors comprise about 7 % of all malignant neoplasms. In the head and neck area, tumors are usually located on the tongue (25–40 %) and floor of mouth (15–20 %). In the majority of cases, diagnosis, especially at early disease stages, is based on clinical and histopathological evaluation of tumor process. However, recently development and implementation of non-invasive techniques of early diagnosis of upper respiratory tract tumors through detection of pathognomonic volatile tumor markers in the exhaled air has become topical.Aim. To evaluate diagnostic accuracy of

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Tretyakov, Akim, Denis Vrazhnov, Alexander Shkurinov, Viacheslav Zasedatel, and Yury Kistenev. "Qualitative and Quantitative Analysis of Volatile Molecular Biomarkers in Breath Using THz-IR Spectroscopy and Machine Learning." Applied Sciences 14, no. 24 (2024): 11521. https://doi.org/10.3390/app142411521.

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Exhaled air contains volatile molecular compounds of endogenous origin, being products of current metabolic pathways. It can be used for medical express diagnostics through control of these compounds in the patient’s breath using molecular absorption spectroscopy. The fundamental problem in this field is that the composition of exhaled air or other gas mixtures of natural origin is unknown, and content analysis of such spectra by conventional iterative methods is unpredictable. Machine learning methods enable the establishment of latent dependencies in spectral data and the conducting of their

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Dragonieri, Silvano, Vitaliano Nicola Quaranta, Pierluigi Carratù, Teresa Ranieri, Enrico Buonamico, and Giovanna Elisiana Carpagnano. "Breathing Rhythm Variations during Wash-In Do Not Influence Exhaled Volatile Organic Compound Profile Analyzed by an Electronic Nose." Molecules 26, no. 9 (2021): 2695. http://dx.doi.org/10.3390/molecules26092695.

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E-noses are innovative tools used for exhaled volatile organic compound (VOC) analysis, which have shown their potential in several diseases. Before obtaining a full validation of these instruments in clinical settings, a number of methodological issues still have to be established. We aimed to assess whether variations in breathing rhythm during wash-in with VOC-filtered air before exhaled air collection reflect changes in the exhaled VOC profile when analyzed by an e-nose (Cyranose 320). We enrolled 20 normal subjects and randomly collected their exhaled breath at three different breathing r

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Hintzen, K. F. H., A. Smolinska, A. G. R. Mommers, N. D. Bouvy, F. J. van Schooten, and T. Lubbers. "Non-invasive breath collection in murine models using a newly developed sampling device ^*." Journal of Breath Research 16, no. 2 (2022): 027102. http://dx.doi.org/10.1088/1752-7163/ac4fae.

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Abstract Volatile organic compounds (VOCs) in exhaled breath have the potential to be used as biomarkers for screening and diagnosis of diseases. Clinical studies are often complicated by both modifiable and non-modifiable factors influencing the composition of VOCs in exhaled breath. Small laboratory animal studies contribute in obtaining fundamental insight in alterations in VOC composition in exhaled breath and thereby facilitate the design and analysis of clinical research. However, long term animal experiments are often limited by invasive breath collection methods and terminal experiment

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Margaryan, Asthik E., Igor A. Platonov, Irina N. Kolesnichenko, Ekaterina A. Novikova, and Alesya S. Karsunkina. "Planar microfluid concentrators based on silagerm 8040 for sampling and sample preparation for the analy-sis of gas media." Сорбционные и хроматографические процессы 23, no. 5 (2023): 732–40. http://dx.doi.org/10.17308/sorpchrom.2023.23/11691.

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Exhaled air is a matrix with a complex molecular composition, including more than 3,500 components of various origins, the content of which can indicate the normal or pathological state of human health. One of the selective markers of diabetes formed in exhaled air is acetone. Its increased content (more than2.54 mg/m3) in exhaled air indicates excessive levels of glucose in the blood. To carry out a diagnostically reliable quantitative analysis of acetone in exhaled air, it is necessary to minimize random errors at all stages of sampling, concentration and calibration. The proposed MFC allow

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Morimatsu, Hiroshi, Toru Takahashi, Kyoichiro Maeshima та ін. "Increased heme catabolism in critically ill patients: correlation among exhaled carbon monoxide, arterial carboxyhemoglobin, and serum bilirubin IXα concentrations". American Journal of Physiology-Lung Cellular and Molecular Physiology 290, № 1 (2006): L114—L119. http://dx.doi.org/10.1152/ajplung.00031.2005.

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It has been reported that exhaled carbon monoxide (CO) concentrations and arterial carboxyhemoglobin (CO-Hb) concentration in blood may be increased in critically ill patients. However, there was no study that examined correlation among amount of CO in exhaled air, CO-Hb concentrations in erythrocytes, and bilirubin IXα (BR) in serum, i.e., the three major indexes of heme catabolism, within the same subject. Here, we examined CO concentrations in exhaled air, CO-Hb concentrations in arterial blood, and BR levels in serum in 29 critically ill patients. Measurements of exhaled CO, arterial CO-Hb

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Chan, Matthew T. V., Benny K. M. Chow, Leo Chu, and David S. C. Hui. "Mask Ventilation and Dispersion of Exhaled Air." American Journal of Respiratory and Critical Care Medicine 187, no. 7 (2013): e12-e14. http://dx.doi.org/10.1164/rccm.201201-0137im.

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Taylor, R. G. S. "Measurement of 222Rn activity in exhaled air." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 241, no. 2-3 (1985): 618–19. http://dx.doi.org/10.1016/0168-9002(85)90625-4.

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Shende, Pravin, Jai Vaidya, Yogesh A. Kulkarni, and R. S. Gaud. "Systematic approaches for biodiagnostics using exhaled air." Journal of Controlled Release 268 (December 2017): 282–95. http://dx.doi.org/10.1016/j.jconrel.2017.10.035.

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Buszewski, Bogusław, Martyna Kęsy, Tomasz Ligor, and Anton Amann. "Human exhaled air analytics: biomarkers of diseases." Biomedical Chromatography 21, no. 6 (2007): 553–66. http://dx.doi.org/10.1002/bmc.835.

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Anatychuk, L. I., O. L. Panasiuk, P. A. Diachenko, et al. "Thermoelectric device for collecting exhaled air condensate." Journal of Thermoelectricity, no. 3 (September 25, 2023): 50–58. https://doi.org/10.63527/1607-8829-2023-3-50-58.

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The article presents the results of the design development and a description of the manufactured experimental sample of a new highly efficient thermoelectric condenser of pulmonary air for the diagnosis of coronavirus and other diseases with an extended range of condensation temperatures below -20 °C and close to -70 °C. The method of using the developed device in medical diagnostics and the results of its experimental studies are described. Bibl. 5, Figs. 5.

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Chen, Chun, and Ruoyu You. "Differentiating between direct and indirect exposure to exhaled particles in indoor environments with mechanical ventilation systems." E3S Web of Conferences 111 (2019): 04034. http://dx.doi.org/10.1051/e3sconf/201911104034.

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Exhaled contaminants transported in the air can result in the transmission of many airborne infectious diseases in indoor environments. When the exhaled air from the infected person directly enters the breathing zone of another person, direct exposure occurs. When the exhaled contaminants disperse in the room and then are inhaled by another person, indirect exposure occurs. This investigation developed a method for differentiating the direct and indirect exposure to exhaled contaminants in indoor environments with mechanical ventilation. A literature review was conducted to collect experimenta

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Popov, Evgeniy, Anton Polishchuk, Anton Kovalev, and Vladimir Vitkin. "Raman Spectroscopy for Urea Breath Test." Biosensors 13, no. 6 (2023): 609. http://dx.doi.org/10.3390/bios13060609.

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The urea breath test is a non-invasive diagnostic method for Helicobacter pylori infections, which relies on the change in the proportion of 13CO2 in exhaled air. Nondispersive infrared sensors are commonly used for the urea breath test in laboratory equipment, but Raman spectroscopy demonstrated potential for more accurate measurements. The accuracy of the Helicobacter pylori detection via the urea breath test using 13CO2 as a biomarker is affected by measurement errors, including equipment error and δ13C measurement uncertainty. We present a Raman scattering-based gas analyzer capable of δ13

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Novikova, L. B. "Artificial smell sensor systems in the diagnostics of neurodegenerative diseases." Аналитика и контроль 27, no. 4 (2023): 199–207. http://dx.doi.org/10.15826/analitika.2023.27.4.001.

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Neurodegenerative diseases are a group of diseases of the nervous system that are characterized by a long-term latent stage, a variety of manifestations associated with heterogeneity of symptoms, different aggressiveness of the course, and progressive death of neurons. Neurodegenerative diseases are mainly diagnosed on the basis of clinical data and expensive invasive and non-invasive imaging techniques. There is no specific laboratory test for diagnosing neurodegenerative diseases. Exhaled air is the secretion of the body, and the process of its selection is simple and economical. Exhaled gas

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Piacentini, G. L., A. Bodini, L. Zerman, et al. "Relationship between exhaled air temperature and exhaled nitric oxide in childhood asthma." European Respiratory Journal 20, no. 1 (2002): 108–11. http://dx.doi.org/10.1183/09031936.02.00237702.

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Киреев, С. В., А. А. Кондрашов та С. Л. Шнырев. "Применение метода абсорбционной диодной лазерной спектроскопии для измерения содержания -=SUP=-13-=/SUP=-С и -=SUP=-12-=/SUP=-С в выдыхаемом воздухе". Оптика и спектроскопия 131, № 1 (2023): 116. http://dx.doi.org/10.21883/os.2023.01.54548.3776-22.

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The paper reports on experimental studies of the absorption of 13C16O2 in a mixture with 12C16O2 in exhaled air by laser absorption spectroscopy using a diode laser tunable in the frequency range 4860-4880 cm-1. The results of the studies showed that the minimum detectable concentration of 13C16O2 is at a level of less than 20 ppm, and this approach is promising for measuring the content of 13C16O2 in exhaled air for non-invasive online diagnosis of oncological diseases of the gastrointestinal tract at early stages

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Hooker, Sascha K., Russel D. Andrews, John P. Y. Arnould, et al. "Fur seals do, but sea lions don't — cross taxa insights into exhalation during ascent from dives." Philosophical Transactions of the Royal Society B: Biological Sciences 376, no. 1830 (2021): 20200219. http://dx.doi.org/10.1098/rstb.2020.0219.

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Management of gases during diving is not well understood across marine mammal species. Prior to diving, phocid (true) seals generally exhale, a behaviour thought to assist with the prevention of decompression sickness. Otariid seals (fur seals and sea lions) have a greater reliance on their lung oxygen stores, and inhale prior to diving. One otariid, the Antarctic fur seal ( Arctocephalus gazella ), then exhales during the final 50–85% of the return to the surface, which may prevent another gas management issue: shallow-water blackout. Here, we compare data collected from animal-attached tags

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Weissmann, N., H. Vogels, R. T. Schermuly, et al. "Measurement of exhaled hydrogen peroxide from rabbit lungs." Biological Chemistry 385, no. 3-4 (2004): 259–64. http://dx.doi.org/10.1515/bc.2004.020.

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Abstract Exhaled H2O2 is considered an indicator of lung inflammatory and oxidative stress. Moreover, H2O2 may be involved in signal transduction processes. It is not fully elucidated to what extent (i) H2O2 escapes from the intravascular compartment, and (ii) pulmonary H2O2 generation and nasopharyngeal H2O2 generation contribute to exhaled H2O2. We investigated H2O2 concentrations in breath condensate from isolated bufferperfused and ventilated rabbit lungs, and from both intubated and spontaneously breathing rabbits with a horseradish peroxidase/ 2,7dichlorofluorescin assay. For the perfuse

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