Academic literature on the topic 'Periodical breathing'

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Journal articles on the topic "Periodical breathing"

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Cai, Zhong Yi, He Len Wu, Xiao Li Zhao, and Jian Ping Zhang. "Bending Stiffness Analysis of Elastic Shafts with Three Types of Transverse Cracks." Advanced Materials Research 356-360 (October 2011): 2197–204. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.2197.

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The breathing mechanism of a transverse crack in an elastic shaft has been extensively researched. Although many different crack models have been presented, little published research has explored experimentally how the shaft crack breathing mechanism interacts with the change of stiffness during each revolution. This study addressed static analysis of the stiffness of elastic shafts with experimentally-induced fatigue, welding or wire cut transverse cracks. Bending stiffness was measured from different angles under a three point bending fixture, to efficiently define the correct periodical sti
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Zhang, Xiaoli, Junda Su, Ningren Cui, Hongyu Gai, Zhongying Wu, and Chun Jiang. "The disruption of central CO2 chemosensitivity in a mouse model of Rett syndrome." American Journal of Physiology-Cell Physiology 301, no. 3 (2011): C729—C738. http://dx.doi.org/10.1152/ajpcell.00334.2010.

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People with Rett syndrome (RTT) have breathing instability in addition to other neuropathological manifestations. The breathing disturbances contribute to the high incidence of unexplained death and abnormal brain development. However, the cellular mechanisms underlying the breathing abnormalities remain unclear. To test the hypothesis that the central CO2 chemoreception in these people is disrupted, we studied the CO2 chemosensitivity in a mouse model of RTT. The Mecp2-null mice showed a selective loss of their respiratory response to 1–3% CO2 (mild hypercapnia), whereas they displayed more r
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Shchegolkov, Alexandr V. "Regenerative Heat Exchanger Based on Graphene-Modified Paraffin for Portable Respiratory Devices." Nano Hybrids and Composites 13 (January 2017): 69–74. http://dx.doi.org/10.4028/www.scientific.net/nhc.13.69.

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The present paper describes an investigation of the application of the carbon nanostructures-and graphene-modified paraffin for the heat exchange elements of means of individual protection. The thermophysical parameters of the modified material and the test benches in the mode of periodical alternation of temperature, when the oxygen with high temperature up to 250°C is produced in the cartridge (with powdered potassium superoxide) and СО2 at 36 оС is arrived from the artificial lung device, were studied.The application of graphene as the modifiers of heat storage materials for the individual
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Kawczyński, Andrzej L. "Oscillons Localized inside Breathing Periodical Structures in a Two-Variable Model of a One-Dimensional Infinite Excitable Reaction−Diffusion System." Journal of Physical Chemistry A 114, no. 32 (2010): 8217–22. http://dx.doi.org/10.1021/jp104781w.

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Tasic, G. M., B. M. Djurovic, V. T. Jovanovic, et al. "Surgical treatment of brain stem cavernoma: Current approaches." Acta chirurgica Iugoslavica 55, no. 2 (2008): 141–49. http://dx.doi.org/10.2298/aci0802141t.

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Results of our series of 10 operated patients who had cavernous malformation of the brain stem, in accordance with the findings of other authors, have confirmed that surgical removal of cavernomas is an absolutely appropriate approach as regards the prevention of repeated and disabling hemorrhages, also from the point of view of the recovery of the neurological deficit. In patients with disturbed vital functions (breathing, swallowing) evacuation of hematomas and removal of the malformation eliminate life endangering compressive effect on the vital structures of the brain stem. It is not dispu
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Kitamura, Akira, Takeshi Hoshino, Tadashi Kon, and Ryo Ogawa. "Patients with Diabetic Neuropathy Are at Risk of a Greater Intraoperative Reduction in Core Temperature." Anesthesiology 92, no. 5 (2000): 1311–18. http://dx.doi.org/10.1097/00000542-200005000-00019.

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Background Core hypothermia develops after the induction of general anesthesia, but intraoperative vasoconstriction usually prevents its progression. However, diabetes mellitus is often associated with autonomic neuropathy, which leads to abnormal peripheral neurovascular function. Accordingly, we tested the hypothesis that diabetic patients experience a greater reduction in core temperature during general anesthesia than nondiabetic patients. Methods We studied 36 nondiabetic patients (control group) and 27 diabetic patients (diabetic group) undergoing elective abdominal surgery. Both groups
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Várnay, František, Leona Mífková, Pavel Homolka, and Petr Dobšák. "Irregular breathing during the cardiopulmonary exercise test - from mildly irregular breathing pattern to periodic breathing of oscillatory ventilation type." Vnitřní lékařství 63, no. 3 (2017): 175–82. http://dx.doi.org/10.36290/vnl.2017.037.

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Nugent, S. T., and J. P. Finley. "Spectral analysis of the EMG and diaphragmatic muscle fatigue during periodic breathing in infants." Journal of Applied Physiology 58, no. 3 (1985): 830–33. http://dx.doi.org/10.1152/jappl.1985.58.3.830.

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Periodic breathing occurs commonly in full-term and preterm infants. The mechanisms which switch breathing on and off within a cycle of periodic breathing are not certain. Since immature infants may experience diaphragmatic muscle fatigue, one potential switching mechanism is fatigue. Power spectra of the electromyogram, uncontaminated by the electrocardiograph artifact, were studied for evidence of diaphragmatic muscle fatigue during spontaneous periodic breathing in infants. A fall in the high-frequency (103–600 Hz) power and an increase in the low-frequency (23–47 Hz) power during periodic
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Keyl, Cornelius, Peter Lemberger, Michael Pfeifer, Karin Hochmuth, and Peter Geisler. "Heart Rate Variability in Patients with Daytime Sleepiness Suspected of Having Sleep Apnoea Syndrome: A Receiver-Operating Characteristic Analysis." Clinical Science 92, no. 4 (1997): 335–43. http://dx.doi.org/10.1042/cs0920335.

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1. Periodic breathing is known to be associated with cyclic fluctuations in heart rate. The purpose of this study was to evaluate the capability of spectral analysis of heart rate variability to identify episodes with periodic breathing in patients suspected of having sleep apnoea syndrome. 2. Forty-eight subjects complaining of chronic daytime sleepiness were studied using polysomnography and additional monitoring of Holter-ECG and synchronized pulse oximetry. The recordings were divided into 20 min episodes which were identified as recordings registered during normal breathing, periodic brea
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van den Aardweg, J. G., and J. M. Karemaker. "Repetitive apneas induce periodic hypertension in normal subjects through hypoxia." Journal of Applied Physiology 72, no. 3 (1992): 821–27. http://dx.doi.org/10.1152/jappl.1992.72.3.821.

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Periodic increases in blood pressure (BP) can occur in the sleep apnea syndrome (SAS) during recurrent apneas. To investigate the mechanisms causing this periodic hypertension, we simulated SAS by imposing a matching breathing pattern on seven healthy awake male volunteers. Continuous finger arterial BP, electrocardiogram, arterial O2 saturation (SaO2), end-tidal CO2, and tidal volume were measured. The role of hypoxia was studied by comparing apneas during depletion of O2 in the spirometer with those during 100% O2 breathing. In all subjects, BP periodically reached values greater than 150/95
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Dissertations / Theses on the topic "Periodical breathing"

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Johnson, Pamela Lesley. "Sleep and Breathing at High Altitude." University of Sydney, 2008. http://hdl.handle.net/2123/3531.

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Doctor of Philosphy (PhD)<br>This thesis describes the work carried out during four treks, each over 10-11 days, from 1400m to 5000m in the Nepal Himalaya and further work performed during several two-night sojourns at the Barcroft Laboratory at 3800m on White Mountain in California, USA. Nineteen volunteers were studied during the treks in Nepal and seven volunteers were studied at White Mountain. All subjects were normal, healthy individuals who had not travelled to altitudes higher than 1000m in the previous twelve months. The aims of this research were to examine the effects on sleep, and
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Mohr, Mary A. "Quantitative Analysis of Periodic Breathing and Very Long Apnea in Preterm Infants." W&M ScholarWorks, 2016. https://scholarworks.wm.edu/etd/1593092111.

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Campbell, Leah Catherine. "Exploring Differences in Pediatric and Adult Sleep: Two Mathematical Investigations." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338312080.

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Mebrate, Yoseph. "Mathematical modelling of periodic breathing in chronic heart failure to design novel real-time dynamic therapy." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/51091.

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Periodic breathing (PB) is common in chronic heart failure (CHF) and has poor prognosis. The most commonly used therapy option involve continuous positive airway pressure, which is not acceptable to all patients. In this thesis I present a mathematical model providing a novel approach to treat PB with carefully controlled dynamic administration of supplementary CO2. I explored the consequences of phasic CO2 administration, with different timing and dosing algorithms. I found an optimal time window within the ventilatory cycle in which therapy reduces ventilation oscillations by more than 95%.
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Castro, Renata Rodrigues Teixeira de. "Variabilidade ventilatória durante exercício dinâmico em indivíduos saudáveis e com insuficiência cardíaca." Universidade do Estado do Rio de Janeiro, 2010. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=4770.

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A presença de ventilação periódica durante o exercício confere pior prognóstico a pacientes com insuficiência cardíaca. Existem divergências quanto aos critérios para identificação deste fenômeno. Além disso, a interpretação dicotômica (presença ou ausência) quanto a este fenômeno dificulta a estratificação de risco mais detalhada dos pacientes com insuficiência cardíaca. Desta forma, esta tese avalia a utilização de técnicas estabelecidas para análise de variabilidade de sinais para quantificar as oscilações ventilatórias que ocorrem durante o teste cardiopulmonar de exercício, em indivíd
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Nespoulet, Hugo. "Oxygénation en conditions hypoxiques : rôle de la chémosensibilité sur la tolérance à l'altitude, plasticité et amélioration par pression positive expiratoire." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENS041/document.

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A l'éveil comme au cours du sommeil, en plaine comme en haute altitude, le maintien d'une oxygénation artérielle stable et élevée est un marqueur essentiel d'une bonne réponse physiologique de l'organisme. L'intolérance à l'altitude regroupe des pathologies graves voire fatales dont le développement est en lien direct avec le taux d'oxygénation artériel des sujets. D'autre part, en plaine, la prévalence élevée du syndrome d'apnées obstructives du sommeil (SAOS) incite les chercheurs au développement de modèles d'études spécifiques, permettant d'investiguer les conséquences du principal stimulu
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Yeh, Shu-Ming, and 葉書銘. "Changes of Exercise Periodic Breathing after Obesity Weight Reduction Program." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/71646655995736005903.

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碩士<br>國立中正大學<br>運動與休閒教育研究所<br>101<br>Purpose: To compare exercise physiology performance between obesity with and without EPB and to discuss if weight reduction program can modify the EPB phenomenon in obesity. Method: The Exercise gas analysis data of 96 participants (24 male and 72 female) in National Taiwan University Hospital weight reduction exercise program was collected from 2008/01/01 to 2012/12/31. We recorded the duration and amplitude of 3 maximal fluctuations of ventilation expiration (VE) and divided the participants into two groups (with/without EPB). ). Paired t-tests were used
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Books on the topic "Periodical breathing"

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Nussbaumer-Ochsner, Yvonne, and Konrad E. Bloch. Sleep at high altitude and during space travel. Edited by Sudhansu Chokroverty, Luigi Ferini-Strambi, and Christopher Kennard. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199682003.003.0054.

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This chapter summarizes data on sleep–wake disturbances in humans at high altitude and in space. High altitude exposure is associated with periodic breathing and a trend toward reduced slow-wave sleep and sleep efficiency in healthy individuals. Some subjects are affected by altitude-related illness (eg, acute and chronic mountain sickness, high-altitude cerebral and pulmonary edema). Several drugs are available to prevent and treat these conditions. Data about the effects of microgravity on sleep are limited and do not allow the drawing of firm conclusions. Microgravity and physical and psych
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Randerath, Winfried J., and Shahrokh Javaheri. Sleep and the heart. Edited by Sudhansu Chokroverty, Luigi Ferini-Strambi, and Christopher Kennard. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199682003.003.0040.

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Heart function and sleep are closely associated. While NREM sleep reduces cardiac workload, phasic REM sleep increases sympathetic activity and cardiac vulnerability. Heart failure (HF) patients suffer from disturbed sleep due to frequent awakenings, periodic limb movements, sleep apnea, and depression. Insomnia seems to be associated with incident HF, and, when comorbid, results in a vicious circle. There is much evidence of a relationship between breathing disturbances during sleep and heart diseases. At least 50% of HF patients suffer from obstructive (OSA) or central (CSA) sleep apnea, bot
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Book chapters on the topic "Periodical breathing"

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Burgess, Keith, Katie Burgess, Prajan Subedi, Phil Ainslie, Zbigniew Topor, and William Whitelaw. "Prediction of Periodic Breathing at Altitude." In Integration in Respiratory Control. Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-73693-8_77.

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Gottschalk, A., M. C. K. Khoo, and A. I. Pack. "Multiple Modes of Periodic Breathing during Sleep." In Advances in Experimental Medicine and Biology. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1933-1_22.

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Caples, S. M., and V. K. Somers. "Central Sleep Apnea, Hypoventilation Syndromes and Periodic Breathing Disorders." In Sleep Apnea. KARGER, 2006. http://dx.doi.org/10.1159/000093167.

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LONGOBARDO, GUY, Carlo J. Evangelisti, and Neil S. Cherniack. "Effects of Controller Dynamics on Simulations of Irregular and Periodic Breathing." In Advances in Experimental Medicine and Biology. Springer US, 2003. http://dx.doi.org/10.1007/978-1-4419-9280-2_50.

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Eleuteri, Michela, Erica Ipocoana, Jana Kopfová, and Pavel Krejčí. "Breathing as a Periodic Gas Exchange in a Deformable Porous Medium." In Trends in Mathematics. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25261-8_20.

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Fordyce, Wayne E., and Robert K. Kanter. "Factors Inducing Periodic Breathing in Man During Acclimatization to Chronic Hypoxia." In Respiratory Control. Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0529-3_34.

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Wolff, C. B., M. Bell, C. D. Thake, and D. J. Collier. "Oscillations in Cardiac Output in Hypoxia with Periodic Breathing and Constant End-Tidal PCO2 at High Altitude (5,000 m)." In Oxygen Transport to Tissue XXXIII. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-1566-4_29.

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"Periodic Breathing." In Respiratory Control and Disorders in the Newborn. CRC Press, 2003. http://dx.doi.org/10.3109/9780203912027-14.

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"Theoretical Models of Periodic Breathing." In Sleep Apnea. CRC Press, 2000. http://dx.doi.org/10.1201/b15277-20.

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Wellman, Andrew, and David P. White. "Central Sleep Apnea and Periodic Breathing." In Principles and Practice of Sleep Medicine. Elsevier, 2011. http://dx.doi.org/10.1016/b978-1-4160-6645-3.00100-6.

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Conference papers on the topic "Periodical breathing"

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Delaunay, Nathalie, and Miriam Marchon. "Obstructive sleep apnoea syndrome: a screening test for periodical medical examinations?" In ERS/ESRS Sleep and Breathing Conference 2017 abstracts. European Respiratory Society, 2017. http://dx.doi.org/10.1183/23120541.sleepandbreathing-2017.p11.

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Inoue, Tsuyoshi, Toshihiro Yamamichi, Masato Kato, and Yukio Ishida. "Vibration Analysis and Detection of Rotor Crack in a Multi-Disk Rotor System by Periodic Excitation Using AMB." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34639.

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Operating of rotating machinery with a rotor crack is a risk condition, since the rotor crack grows gradually and may fail causing a catastrophic accident. Therefore, it is very important to detect the occurrence of a crack on rotating machinery in early stages. The authors have used the simple two-degree-of-freedom cracked rotor model, and investigated the usage of periodic excitation for the detection of the rotor crack. This paper constructs a finite element rotor model with breathing crack element, and performs the numerical investigation. The dynamic responses of a cracked rotor system un
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Kulesza, Zbigniew, and Jerzy T. Sawicki. "Parametrically Induced Damping in a Cracked Rotor." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-58113.

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The tendency to higher speeds in turbomachinery results in the design of more flexible shafts, which run at speeds above several of their natural frequencies. Due to stress concentration and high spin speed, the rotor dynamic system is more prone to cracks that propagate faster due to low-cycle fatigue loading. The propagating shaft crack usually leads to sudden machine failure, its damage and a serious accident. Therefore, an early shaft crack detection and warning is an important research task. A transverse shaft crack in a rotor is usually modeled as a local change in the shaft stiffness. I
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Pusalavidyasagar, Snigdha, Reena Kartha, and Adnan Abbasi. "Effect of periodic limb movements on plasma nitric oxide levels in patients with obstructive sleep apnoea." In ERS/ESRS Sleep and Breathing Conference 2017 abstracts. European Respiratory Society, 2017. http://dx.doi.org/10.1183/23120541.sleepandbreathing-2017.p87.

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Dongol, Eptehal, Panagis Drakatos, Rexford Tapiwa Muza, et al. "Periodic limb movement disorder: a Trojan horse for residual sleepiness in patients with OSAS while on CPAP?" In ERS/ESRS Sleep and Breathing Conference 2017 abstracts. European Respiratory Society, 2017. http://dx.doi.org/10.1183/23120541.sleepandbreathing-2017.p29.

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Spiesshoefer, Jens, Sara Becker, Peter Young, Matthias Boentert, and Alberto Giannoni. "Impact of voluntary periodic breathing on hemodynamics and autonomic nervous system function in patients with and without heart failure." In ERS/ESRS Sleep and Breathing Conference 2019 abstracts. European Respiratory Society, 2019. http://dx.doi.org/10.1183/23120541.sleepandbreathing-2019.p29.

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Ghirardo, Sergio, Alessandro Amaddeo, Sonia Khirani, Lucie Griffon, and Brigitte Fauroux. "Description of central apnea and periodic breathing in children." In ERS International Congress 2020 abstracts. European Respiratory Society, 2020. http://dx.doi.org/10.1183/13993003.congress-2020.1226.

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Herkenrath, Simon, Catarina Lacerda, Alessandra Castrogiovanni, et al. "Loop Gain in Heart Failure Patients with Periodic Breathing." In ERS International Congress 2017 abstracts. European Respiratory Society, 2017. http://dx.doi.org/10.1183/1393003.congress-2017.oa3205.

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Garde, Ainara, Beatriz F. Giraldo, Raimon Jane, et al. "Characterization of periodic and non-periodic breathing pattern in chronic heart failure patients." In 2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2008. http://dx.doi.org/10.1109/iembs.2008.4649891.

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Fletcher, Hannah, Arif Khokhar, Peter Siu Pan Cho, and James Hull. "Exercise-related periodic ventilatory irregularities in dysfunctional breathing disorder>." In ERS International Congress 2017 abstracts. European Respiratory Society, 2017. http://dx.doi.org/10.1183/1393003.congress-2017.pa2233.

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Reports on the topic "Periodical breathing"

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White, David P., Kevin Gleeson, John T. Reeves, Cheryl K. Pickett, and Anne M. Rannels. Predictors of Periodic Breathing at Altitude. Defense Technical Information Center, 1986. http://dx.doi.org/10.21236/ada167947.

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Clausen, Jay, D. Moore, L. Cain, and K. Malinowski. VI preferential pathways : rule or exception. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41305.

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Trichloroethylene (TCE) releases from leaks and spills next to a large government building occurred over several decades with the most recent event occurring 20 years ago. In response to a perceived conventional vapor intrusion (VI) issue a sub-slab depressurization system (SSDS) was installed 6 years ago. The SSDS is operating within design limits and has achieved building TCE vapor concentration reductions. However, subsequent periodic TCE vapor spikes based on daily HAPSITE™ measurements indicate additional source(s). Two rounds of smoke tests conducted in 2017 and 2018 involved introductio
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