keyword
MENU ▼
Read by QxMD icon Read
search

Tidal volume

keyword
https://www.readbyqxmd.com/read/28227703/evaluation-of-lung-ventilation-distribution-in-chronic-obstructive-pulmonary-disease-patients-using-the-global-inhomogeneity-index
#1
F Trenk, L Mendes, P Carvalho, R P Paiva, J Henriques, N Maglaveras, I Chouvarda, V Tsara, C A Teixeira, F Trenk, L Mendes, P Carvalho, R P Paiva, J Henriques, N Maglaveras, I Chouvarda, V Tsara, C A Teixeira, P Carvalho, V Tsara, L Mendes, C A Teixeira, J Henriques, F Trenk, N Maglaveras, I Chouvarda, R P Paiva
The global inhomogeneity (GI) index is a electrical impedance tomography (EIT) parameter that quantifies the tidal volume distribution within the lung. In this work the global inhomogeneity index was computed for twenty subjects in order to evaluate his potential use in the detection and follow up of chronic obstructive pulmonary disease (COPD) patients. EIT data of 17 subjects were acquired: 14 patients with the main diagnoses of COPD and 3 healthy subjects which served as a control group. Two or three datasets of around 30 seconds were acquired at 33 scans/s and analysed for each subject...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227285/non-contact-real-time-estimation-of-intrapulmonary-pressure-and-tidal-volume-for-chronic-heart-failure-patients
#2
Vinh Phuc Tran, Adel Ali Al-Jumaily, Vinh Phuc Tran, Adel Ali Al-Jumaily, Vinh Phuc Tran, Adel Ali Al-Jumaily
Long-term continuous patient monitoring is required in many health systems for monitoring and analytical diagnosing purposes. It has been recognized that these types of monitoring systems have shortcomings related to patient comfort and/or functionality. Non-contact monitoring systems have been developed to address some of these shortcomings. One of such systems is non-contact physiological vital signs assessments for Chronic Heart Failure (CHF) patients. This paper presents a novel pulmonary ventilation model that defines the relationship between the intrapulmonary pressure and the chest displacement...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226946/optical-measurement-of-breathing-algorithm-volume-calibration-and-preliminary-validation-on-healthy-trained-subjects
#3
C Massaroni, E Cassetta, I K Levai, S Winter, J W Dickinson, S Silvestri, C Massaroni, E Cassetta, I K Levai, S Winter, J W Dickinson, S Silvestri, E Cassetta, S Winter, J W Dickinson, S Silvestri, C Massaroni, I K Levai
The use of optical technologies may be beneficial when measuring breathing biomechanics. The purpose of this study was twofold: i) to enhance the optoelectronic plethysmography (OEP) algorithm performance for the volume estimation by the use of a novel volume calibration procedure and ii) to compare the OEP volumes gained by a commercial optoelectronic system against actual respiratory volumes measured by a breath-by-breath gas analyzer (BbB). The OEP volume algorithm calibration was performed by the use of a novel volume calibration procedure based on both a calibrator device that delivered known volumes changes and one ad-hoc designed software for the static and dynamic calibration analysis...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226466/using-respiratory-signals-for-the-recognition-of-human-activities
#4
Raul I Ramos-Garcia, Stephen Tiffany, Edward Sazonov, Raul I Ramos-Garcia, Stephen Tiffany, Edward Sazonov, Raul I Ramos-Garcia, Stephen Tiffany, Edward Sazonov
Human activity recognition through wearable sensors is becoming integral to health monitoring and other applications. Typically, human activity is captured through signals from inertial sensors, while signals from other sensors have been utilized less frequently. In this study, we explored the feasibility of classifying human activities by analyzing the temporal information of respiratory signals through hidden Markov models (HMMs). Left-to-right HMMs were trained for five activities: sedentary, walking, eating, talking, and cigarette smoking...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225887/it-is-impossible-to-know-the-way-if-we-do-not-know-where-to-start-tidal-volume-driving-pressure-and-positive-end-expiratory-pressure
#5
Marcelo Cunio Machado Fonseca, Werther Brunow de Carvalho
No abstract text is available yet for this article.
January 1, 2017: Revista da Associação Médica Brasileira
https://www.readbyqxmd.com/read/28223465/assessment-of-bohr-and-enghoff-dead-space-equations-in-mechanically-ventilated-children
#6
Pierre Bourgoin, Florent Baudin, David Brossier, Guillaume Emeriaud, Marc Wysocki, Philippe Jouvet
BACKGROUND: Recent findings suggest that using alveolar PCO2 (PACO2 ) estimated by volumetric capnography in the Bohr equation instead of PaCO2 (Enghoff modification) could be appropriate for the calculation of physiological dead space to tidal volume ratio (VD/VT Bohr and VD/VT Enghoff, respectively). We aimed to describe the relationship between these 2 measurements in mechanically ventilated children and their significance in cases of ARDS. METHODS: From June 2013 to December 2013, mechanically ventilated children with various respiratory conditions were included in this study...
February 21, 2017: Respiratory Care
https://www.readbyqxmd.com/read/28223038/nanoconjugate-bound-adenosine-a1-receptor-antagonist-enhances-recovery-of-breathing-following-acute-cervical-spinal-cord-injury
#7
Zeljka Minic, Sharowyn Wilson, Fangchao Liu, Abdulghani Sankari, Guangzhao Mao, Harry Goshgarian
Respiratory complications in patients with spinal cord injury (SCI) are common and can have a negative impact on the quality of patients' lives. Previously, we found that intradiaphragmatic administration of the nanoconjugate-bound A1 adenosine receptor antagonist, 1,3-dipropyl-8-cyclopentylxanthine (DPCPX) induced recovery of diaphragm function following SCI in rats. When administered immediately following the injury, recovery was observed as early as 3days following SCI and it persisted until the end of the study, 28days after the drug delivery...
February 18, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28221999/coupling-effect-of-double-lungs-on-a-vcv-ventilator-with-automatic-secretion-clearance-function
#8
Yan Shi, Bolun Zhang, Maolin Cai, Weiqing Xu
For patients with mechanical ventilation, secretions in airway are harmful and sometimes even mortal, it's of great significance to clear secretion timely and efficiently. In this paper, a new secretion clearance method for VCV (volume-controlled ventilation) ventilator is put forward, and a secretion clearance system with a VCV ventilator and double lungs is designed. Furthermore, the mathematical model of the secretion clearance system is built and verified via experimental study. Finally, to illustrate the influence of key parameters of respiratory system and secretion clearance system on the secretion clearance characteristics, coupling effects of two lungs on VCV secretion clearance system are studied by an orthogonal experiment, it can be obtained that rise of tidal volume adds to efficiency of secretion clearance while effect of area, compliance and suction pressure on efficiency of secretion clearance needs further study...
February 16, 2017: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/28215134/drainage-of-pleural-effusion-improves-diaphragmatic-function-in-mechanically-ventilated-patients
#9
Michele Umbrello, Giovanni Mistraletti, Andrea Galimberti, Ilaria R Piva, Ottavia Cozzi, Paolo Formenti
BACKGROUND: Pleural effusion adversely affects the pressuregenerating capacity of the diaphragm. It uncouples the lung and chest wall, which may result in diaphragmatic dysfunction. Information on the effects of effusion drainage on diaphragmatic function is limited, but several studies report relief of dyspnoea after drainage, which was attributed to improved diaphragmatic mechanics, even if this issue was never formally addressed. OBJECTIVE: To investigate the effect of drainage of unilateral pleural effusion on diaphragmatic function...
March 2017: Critical Care and Resuscitation: Journal of the Australasian Academy of Critical Care Medicine
https://www.readbyqxmd.com/read/28214133/dynamic-hyperinflation-in-patients-with-asthma-and-exercise-induced-bronchoconstriction
#10
Olga Mediano, Raquel Casitas, Carlos Villasante, Elisabet Martínez-Cerón, Raúl Galera, Ester Zamarrón, Francisco García-Río
BACKGROUND: Little is known about the behavior of operative lung volumes during exercise in patients with asthma and exercise-induced bronchoconstriction (EIB). OBJECTIVES: To compare the presence of dynamic hyperinflation (DH) in patients with mild asthma with and without EIB and in healthy individuals and to relate the changes in end-expiratory lung volume (EELV) with postexercise airflow reduction. METHODS: A total of 122 consecutive stable patients (>12 years of age) with mild asthma and 38 controls were studied...
February 14, 2017: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/28213470/higher-mini-bal-total-protein-concentration-in-early-ards-predicts-faster-resolution-of-lung-injury-measured-by-more-ventilator-free-days
#11
Carolyn M Hendrickson, Jason Abbott, Hanjing Zhuo, Kathleen D Liu, Carolyn S Calfee, Michael A Matthay
The protein concentration of alveolar edema fluid in acute respiratory distress syndrome (ARDS) is dynamic. It reflects alveolar flooding during acute injury as well as fluid and protein clearance over time. We hypothesized that among ARDS patients treated with low tidal volume ventilation, higher concentrations of protein in mini-bronchoalveolar lavage (mBAL) samples would predict slower resolution of lung injury and worse clinical outcomes. Total protein and IgM concentrations in Day 0 mBAL samples from 79 subjects enrolled in the aerosolized albuterol (ALTA) ARDS Network Albuterol trial were measured by colorimetric assay and ELISA respectively...
February 17, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28213294/a-low-cost-simplified-and-scaleable-pneumotachograph-and-face-mask-for-neonatal-mouse-respiratory-measurements
#12
Jenny J Sun, Roshan Nanu, Russell S Ray
INTRODUCTION: Neonatal respiratory disorders are a leading cause of perinatal mortality due to complications resulting from premature births and prenatal exposure to drugs of abuse, but optimal treatments for these symptoms are still unclear due to a variety of confounds and risk factors. Mouse models present an opportunity to study the underlying mechanisms and efficacy of potential treatments of these conditions with controlled variables. However, measuring respiration in newborn mice is difficult and commercial components are expensive and often require modification, creating a barrier and limiting our understanding of the short and long-term effects of birth complications on respiratory function...
February 15, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28213201/respiratory-load-perception-in-overweight-and-asthmatic-children
#13
Victoria MacBean, Lorna Wheatley, Alan C Lunt, Gerrard F Rafferty
Overweight asthmatic children report greater symptoms than normal weight asthmatics, despite comparable airflow obstruction. This has been widely assumed to be due to heightened perception of respiratory effort. Three groups of children (healthy weight controls, healthy weight asthmatics, overweight asthmatics) rated perceived respiratory effort throughout an inspiratory resistive loading protocol. Parasternal intercostal electromyogram was used as an objective marker of respiratory load; this was expressed relative to tidal volume and reported as a ratio of the baseline value (neuroventilatory activity ratio (NVEAR))...
February 14, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28212247/african-american-disparities-in-low-tidal-volume-ventilation
#14
Jason Chertoff
No abstract text is available yet for this article.
March 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28212162/volume-and-pressure-delivery-during-pediatric-high-frequency-oscillatory-ventilation
#15
Ronald Wong, Timothy Deakers, Justin Hotz, Robinder G Khemani, Patrick A Ross, Christopher J Newth
OBJECTIVE: Identify variables independently associated with delivered tidal volume (VT) and measured mean airway pressure during high-frequency oscillatory ventilation across the range of pediatric endotracheal tube sizes. DESIGN: In vitro study. SETTING: Research laboratory. INTERVENTIONS: An in vitro bench model of the intubated pediatric respiratory system during high-frequency oscillatory ventilation was used to obtain delivered VT and mean airway pressure (in the distal lung) for various endotracheal tube sizes...
February 16, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28212050/volume-controlled-ventilation-does-not-prevent-injurious-inflation-during-spontaneous-effort
#16
Takeshi Yoshida, Susumu Nakahashi, Maria Aparecida Miyuki Nakamura, Yukiko Koyama, Rollin Roldan, Vinicius Torsani, Roberta R De Santis, Susimeire Gomes, Akinori Uchiyama, Marcelo B P Amato, Brian P Kavanagh, Yuji Fujino
RATIONALE: Spontaneous breathing during mechanical ventilation increases transpulmonary pressure and tidal volume, and worsens lung injury. Intuitively, controlling tidal volume and transpulmonary pressure might limit injury from added spontaneous effort. OBJECTIVES: To test the hypothesis that during spontaneous effort in injured lungs, tidal volume and transpulmonary pressure limitation by volume-controlled ventilation results in less injurious patterns of inflation...
February 17, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28204830/monoclonal-antibody-against-toll-like-receptor%C3%A2-4-attenuates-ventilator-induced-lung-injury-in-rats-by-inhibiting-myd88-and-nf-%C3%AE%C2%BAb-dependent-signaling
#17
Cuiyuan Huang, Linghui Pan, Fei Lin, Huijun Dai, Ruili Fu
The mechanisms through which mechanical ventilation causes non-infectious inflammatory diseases and lung injury are poorly understood. Animals models of this type of injury suggest that it involves signaling mediated by Toll‑like receptor (TLR)4 and 9. In this study, in order to gain further insight into the involvement of TLR4 in this type of injury, we performed in vivo and in vitro experiments to determine the mechanisms through which TLR4 triggers inflammation. We also examined whether the use of TLR4 monoclonal antibody (mAb) can alleviate this type of injury...
March 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28202552/airway-dynamics-in-copd-patients-by-within-breath-impedance-tracking-effects-of-continuous-positive-airway-pressure
#18
András Lorx, Dorottya Czövek, Zoltán Gingl, Gergely Makan, Bence Radics, Dóra Bartusek, Szabolcs Szigeti, János Gál, György Losonczy, Peter D Sly, Zoltán Hantos
Tracking of the within-breath changes of respiratory mechanics using the forced oscillation technique may provide outcomes that characterise the dynamic behaviour of the airways during normal breathing.We measured respiratory resistance (Rrs) and reactance (Xrs) at 8 Hz in 55 chronic obstructive pulmonary disease (COPD) patients and 20 healthy controls, and evaluated Rrs and Xrs as functions of gas flow (V') and volume (V) during normal breathing cycles. In 12 COPD patients, additional measurements were made at continuous positive airway pressure (CPAP) levels of 4, 8, 14 and 20 hPa...
February 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28199243/intraabdominal-surgery-and-anesthesia-management
#19
John Hedley-Whyte
: Inspired Oxygenation in Surgical Patients During General Anesthesia With Controlled Ventilation: A Concept of Atelectasis. By Bendixen HH, Hedley-Whyte J, and Laver MB. New Engl J Med 1963; 269:991-996. Reprinted with permission. ABSTRACT: The purpose of this study was to determine if the pattern of ventilation, by itself, influences oxygenation during anesthesia and surgery and examine the hypothesis that progressive pulmonary atelectasis may occur during constant ventilation whenever periodic hyperventilation is lacking, but is reversible by passive hyperinflation of the lungs...
March 2017: Anesthesiology
https://www.readbyqxmd.com/read/28196936/influences-of-duration-of-inspiratory-effort-respiratory-mechanics-and-ventilator-type-on-asynchrony-with-pressure-support-and-proportional-assist-ventilation
#20
Renata S Vasconcelos, Raquel P Sales, Luíz H de P Melo, Liégina S Marinho, Vasco Pd Bastos, Andréa da Nc Nogueira, Juliana C Ferreira, Marcelo A Holanda
BACKGROUND: Pressure support ventilation (PSV) is often associated with patient-ventilator asynchrony. Proportional assist ventilation (PAV) offers inspiratory assistance proportional to patient effort, minimizing patient-ventilator asynchrony. The objective of this study was to evaluate the influence of respiratory mechanics and patient effort on patient-ventilator asynchrony during PSV and PAV plus (PAV+). METHODS: We used a mechanical lung simulator and studied 3 respiratory mechanics profiles (normal, obstructive, and restrictive), with variations in the duration of inspiratory effort: 0...
February 14, 2017: Respiratory Care
keyword
keyword
25542
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"