keyword
MENU ▼
Read by QxMD icon Read
search

altitude chamber

keyword
https://www.readbyqxmd.com/read/28069461/is-acute-mountain-sickness-related-to-trait-anxiety-a-normobaric-chamber-study
#1
Martin Niedermeier, Robb Waanders, Verena Menz, Maria Wille, Martin Kopp, Martin Burtscher
INTRODUCTION: Some mountaineers are more prone to the occurrence of acute mountain sickness (AMS) than others. State anxiety during altitude exposure might be associated with AMS development. We hypothesized that trait anxiety might be higher in AMS cases compared to non-AMS cases. The aim of the present study was to study the relationship between AMS development and trait anxiety. METHODS: In an observational study design, AMS incidence during a 12-hour exposure to normobaric hypoxia (FiO2=12...
January 6, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28061780/rhodiola-crenulata-extract-counteracts-the-effect-of-hypobaric-hypoxia-in-rat-heart-via-redirection-of-the-nitric-oxide-and-arginase-1-pathway
#2
Shih-Wei Hsu, Tsu-Chung Chang, Yu-Kuan Wu, Kuen-Tze Lin, Li-Shian Shi, Shih-Yu Lee
BACKGROUND: Rhodiola crenulata is traditionally used as a folk medicine in Tibet for preventing high-altitude illnesses, including sudden cardiac death (SCD). The cardio-protective effects of Rhodiola crenulata root extract (RCE) against hypoxia in vivo have been recently confirmed. However, the way in which RCE produces these effects remains unclear. The present study is designed to confirm the protective effects of RCE on the heart in acute hypobaric hypoxia exposure and examine the mechanisms by which this occurs...
January 7, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28057654/protocol-for-a-prospective-controlled-observational-study-to-evaluate-the-influence-of-hypoxia-on-healthy-volunteers-and-patients-with-inflammatory-bowel-disease-the-altitude-ibd-study
#3
Stephan Vavricka, Pedro A Ruiz, Sylvie Scharl, Luc Biedermann, Michael Scharl, Cheryl de Vallière, Carsten Lundby, Roland H Wenger, Leonhard Held, Tobias M Merz, Max Gassmann, Thomas Lutz, Andres Kunz, Denis Bron, Adriano Fontana, Laura Strauss, Achim Weber, Michael Fried, Gerhard Rogler, Jonas Zeitz
INTRODUCTION: Inflammatory bowel disease (IBD) is a chronic intestinal disorder, often leading to an impaired quality of life in affected patients. The importance of environmental factors in the pathogenesis of IBD, including their disease-modifying potential, is increasingly recognised. Hypoxia seems to be an important driver of inflammation, as has been reported by our group and others. The aim of the study is to evaluate if hypoxia can alter disease activity of IBD measured by Harvey-Bradshaw Activity Index in Crohn's disease (increase to ≥5 points) and the partial Mayo Score for ulcerative colitis (increase to ≥2 points)...
January 5, 2017: BMJ Open
https://www.readbyqxmd.com/read/28056235/-a-novel-open-chest-method-of-right-ventricular-hemodynamics-measurement-in-pulmonary-hypertensive-mice
#4
A H Yuan, Y Y He, S H Yang, S Q Li, J Ye, S Hu, J Y Qiu, Z C Jing, X J Wang
Objective: Right heart catheterization is the gold-standard for measurement of right ventricular hemodynamics. However, it is difficult to perform in mice. We thus aimed to establish a new open chest method to record and analyze the right ventricular hemodynamic parameters in intubated mice connected to a respirator under anesthesia. Methods: Eight-week old male C57BL/6 mice were divided into the control group, and the hypoxia group using completely random method. Mice in the hypoxia group were exposed in low pressure oxygen chamber, which simulated the environment of plateau (5 500 m altitude, 10% oxygen) for 3 weeks...
December 24, 2016: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/27990700/biomass-fuel-smoke-exposure-was-associated-with-adverse-cardiac-remodeling-and-left-ventricular-dysfunction-in-peru
#5
Melissa S Burroughs Peña, Eric J Velazquez, Jose D Rivera, Fawaz Alenezi, Catherine Wong, Matthew Grigsby, Victor G Davila-Roman, Robert H Gilman, Jaime J Miranda, William Checkley
BACKGROUND: While household air pollution from biomass fuel combustion has been linked to cardiovascular disease, the effects on cardiac structure and function have not been well described. We sought to determine the association between biomass fuel smoke exposure and cardiac structure and function by transthoracic echocardiography. METHODS: We identified a random sample of urban and rural residents living in the high-altitude region of Puno, Peru. Daily biomass fuel use was self-reported...
December 19, 2016: Indoor Air
https://www.readbyqxmd.com/read/27959667/bench-evaluation-of-four-portable-oxygen-concentrators-under-different-conditions-representing-altitudes-of-2438-4200-and-8000%C3%A2-m
#6
Vincent Bunel, Amr Shoukri, Frederic Choin, Serge Roblin, Cindy Smith, Thomas Similowski, Capucine Morélot-Panzini, Jesus Gonzalez
Bunel, Vincent, Amr Shoukri, Frederic Choin, Serge Roblin, Cindy Smith, Thomas Similowski, Capucine Morélot-Panzini, and Jésus Gonzalez. Bench evaluation of four portable oxygen concentrators under different conditions representing altitudes of 2438, 4200, and 8000 m. High Alt Med Biol. 17:370-374, 2016.-Air travel is responsible for a reduction of the partial pressure of oxygen (O2) as a result of the decreased barometric pressure. This hypobaric hypoxia can be dangerous for passengers with respiratory diseases, requiring initiation or intensification of oxygen therapy during the flight...
December 2016: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/27925282/hypobaric-hypoxia-regulates-brain-iron-homeostasis-in-rats
#7
Yaru Li, Peng Yu, Shi-Yang Chang, Qiong Wu, Panpan Yu, Congcong Xie, Wenyue Wu, Baolu Zhao, Guofen Gao, Yan-Zhong Chang
Disruption of iron homeostasis in brain has been found to be closely involved in several neurodegenerative diseases. Recent studies have reported that appropriate intermittent hypobaric hypoxia played a protective role in brain injury caused by acute hypoxia. However, the mechanisms of this protective effect have not been fully understood. In this study, Sprague-Dawley (SD) rat models were developed by hypobaric hypoxia treatment in an altitude chamber, and the iron level and iron related protein levels were determined in rat brain after 4 weeks of treatment...
December 6, 2016: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/27923417/mechanisms-of-memory-dysfunction-during-high-altitude-hypoxia-training-in-military-aircrew
#8
Daniel A Nation, Mark W Bondi, Ellis Gayles, Dean C Delis
OBJECTIVES: Cognitive dysfunction from high altitude exposure is a major cause of civilian and military air disasters. Pilot training improves recognition of the early symptoms of altitude exposure so that countermeasures may be taken before loss of consciousness. Little is known regarding the nature of cognitive impairments manifesting within this critical window when life-saving measures may still be taken. Prior studies evaluating cognition during high altitude simulation have predominantly focused on measures of reaction time and other basic attention or motor processes...
January 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/27888818/high-altitude-illness
#9
Anna Hartman-Ksycińska, Jolanta Kluz-Zawadzka, Bogumił Lewandowski
High-altitude illness is a result of prolonged high-altitude exposure of unacclimatized individuals. The illness is seen in the form of acute mountain sickness (AMS) which if not treated leads to potentially life-threatening high altitude pulmonary oedema and high-altitude cerebral oedema. Medical problems are caused by hypobaric hypoxia stimulating hypoxia-inducible factor (HIF) release. As a result, the central nervous system, circulation and respiratory system function impairment occurs. The most important factor in AMS treatment is acclimatization, withdrawing further ascent and rest or beginning to descent; oxygen supplementation, and pharmacological intervention, and, if available, a portable hyperbaric chamber...
2016: Przegla̧d Epidemiologiczny
https://www.readbyqxmd.com/read/27779957/explosive-decompression-with-resultant-air-gas-embolism-in-a-fourth-generation-fighter-at-ground-level
#10
REVIEW
Joe X Zhang, Jacob R Berry, Devin P Beckstrand
BACKGROUND: Arterial gas embolism (AGE) is a rare condition in the flying community most often only ever seen in flight while operating at high altitude or incidents involving hypobaric chambers. This article describes a severe case of AGE that occurred in a pilot of a fourth generation fighter aircraft at ground level. The environmental control system (ECS) malfunctioned, causing an overpressurized cockpit and a subsequent explosive decompression when the pilot opened the canopy to egress...
2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/27737815/effect-of-tongxinluo-on-pulmonary-hypertension-and-pulmonary-vascular-remodeling-in-rats-exposed-to-a-low-pressure-hypoxic-environment
#11
Yong Wang, Ting-Ting Ma, Na-Na Gao, Xiao-Ling Zhou, Hong Jiang, Rui Guo, Li-Na Jia, Hong Chang, Ying Gao, Zhi-Min Gao, Lei Pan
ETHNOPHARMACOLOGICAL RELEVANCE: Tongxinluo (TXL), which is a Chinese medicine rooted from traditional used herbs, has been used in clinic to treat cardiovascular and cerebrovascular diseases. However, it remains unknown whether TXL alleviates low pressure hypoxic pulmonary hypertension. AIM OF THE STUDY: Here, we aimed to observe the influence of TXL on pulmonary hypertension in a rat model that exposed to high altitude environment characterized by low pressure hypoxia...
December 24, 2016: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/27728906/carbon-monoxide-saturated-hemoglobin-based-oxygen-carriers-attenuate-high-altitude-induced-cardiac-injury-by-amelioration-of-the-inflammation-response-and-mitochondrial-oxidative-damage
#12
Qingshu Wang, Ling Hu, Yu Hu, Gu Gong, Hua Tan, Li Deng, Xiaoqin Sun, Xiaobo Yi, Yangyang Sun, Wei Wu, Tao Li
OBJECTIVE: To investigate the therapeutic effect of carbon monoxide (CO) on high-altitude hypoxia-induced cardiac damage. METHODS: Forty male C57BL/6 mice were randomly divided into 4 groups. The mice were exposed to normoxia or simulated 5,500-meter high-altitude hypoxia in a hypobaric chamber for 7 days. During the first 3 days, the mice were pretreated with CO-saturated hemoglobin (Hb)-based oxygen carrier (CO-HBOC), oxygen-saturated hemoglobin-based oxygen carrier (O2-HBOC) at a dose of 0...
2017: Cardiology
https://www.readbyqxmd.com/read/27637439/laryngeal-cuff-force-application-modeling-during-air-medical-evacuation-simulation
#13
David Eisenbrey, Arthur B Eisenbrey, Patrick Pettengill
Endotracheal tubes are intended to protect the airway and assist with mechanical ventilation in sedated patients. The blood vessels of the tracheal mucosa can be compressed by high tracheal tube cuff pressures (> 30 cm H2O), leading to reduced mucosal blood flow with resulting ischemia and morbidity. Previous research showed a direct correlation between aircraft pressure altitude and the pressure reading from the tracheal cuff, with resulting pressures > 80 cm H2O at 10,000 ft. Standard practice is to periodically remove air from the cuff during ascent based on assumed increased pressure on the adjacent tracheal mucosa...
September 2016: Air Medical Journal
https://www.readbyqxmd.com/read/27634605/respiratory-muscle-training-and-exercise-endurance-at-altitude
#14
Samuel Helfer, Joseph Quackenbush, Michael Fletcher, David R Pendergast
BACKGROUND: Climbing and trekking at altitude are common recreational and military activities. Physiological effects of altitude are hypoxia and hyperventilation. The hyperventilatory response to altitude may cause respiratory muscle fatigue and reduce sustained submaximal exercise. Voluntary isocapnic hyperpnea respiratory muscle training (VIHT) improves exercise endurance at sea level and at depth. The purpose of this study was to test the hypothesis that VIHT would improve exercise time at altitude [3600 m (11,811 ft)] compared to control and placebo groups...
August 2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/27602899/automated-control-of-endotracheal-tube-cuff-pressure-during-simulated-flight
#15
Thomas Blakeman, Dario Rodriquez, James Woods, Daniel Cox, Joel Elterman, Richard Branson
BACKGROUND: Successful mechanical ventilation requires that the airway be controlled by an endotracheal tube (ETT) with an inflatable cuff to seal the airway. Aeromedical evacuation represents a unique challenge in which to manage ETT cuffs. We evaluated three methods of automatic ETT cuff pressure adjustment during changes in altitude in an altitude chamber. METHODS: Size 7.5 and 8.0 mm ETTs that are currently included in the Critical Care Air Transport Team allowance standard were used for the evaluation...
November 2016: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/27596558/-correlation-between-egln1-gene-protein-express-in-lung-tissue-of-rats-and-pulmonary-artery-pressure-at-different-altitude
#16
S H Li, S Li, L Sun, Z Z Bai, Q Y Yang, Q Ga, G E Jin
OBJECTIVE: To investigate the correlation between pulmonary artery pressure (PAP) and the expression level of Egl nine homologue 1 (EGLN1) gene or its protein in lung tissue of rats at different altitudes. METHODS: Totally 121 male Wistar rats were randomly divided into low altitude group (n=11), moderate altitude group and high altitude group, the rats in moderate altitude and high altitude group were further divided into 1(st) day, 3(rd) days, 7(th) days, 15(th) day and 30(th) day group according to the exposure time to hypoxic environment, each group 11 rats...
August 23, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/27553127/dietary-nitrate-supplementation-enhances-high-intensity-running-performance-in-moderate-normobaric-hypoxia-independent-of-aerobic-fitness
#17
Oliver Michael Shannon, Lauren Duckworth, Matthew John Barlow, David Woods, Jose Lara, Mario Siervo, John Paul O'Hara
Nitrate-rich beetroot juice (BRJ) increases plasma nitrite concentrations, lowers the oxygen cost (V⋅O2) of steady-state exercise and improves exercise performance in sedentary and moderately-trained, but rarely in well-trained individuals exercising at sea-level. BRJ supplementation may be more effective in a hypoxic environment, where the reduction of nitrite into nitric oxide (NO) is potentiated, such that well-trained and less well-trained individuals may derive a similar ergogenic effect. We conducted a randomised, counterbalanced, double-blind placebo controlled trial to determine the effects of BRJ on treadmill running performance in moderate normobaric hypoxia (equivalent to 2500 m altitude) in participants with a range of aerobic fitness levels...
September 30, 2016: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/27503042/cognitive-performance-effects-of-bilastine-20-mg-during-6-hours-at-8000-ft-cabin-altitude
#18
RANDOMIZED CONTROLLED TRIAL
Pierre J L Valk, Ries Simons, Andrea M Jetten, Román Valiente, Luis Labeaga
INTRODUCTION: Bilastine is a new oral, second generation antihistamine used in the symptomatic treatment of allergic rhinoconjunctivitis and urticaria. It is considered a nonsedating antihistamine and might be recommended for use in pilots, pending research on the effects on flying-related performance under hypobaric conditions that prevail in an airliner. We assessed the effects of a single dose of bilastine 20 mg on alertness and complex task performance of healthy volunteers in a hypobaric chamber at 75...
July 2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/27503038/cognition-effects-of-low-grade-hypoxia
#19
Andrew A Pilmanis, Ulf I Balldin, Joseph R Fischer
INTRODUCTION: The effects of low-grade hypoxia on cognitive function are reported in this paper. The study compared cognitive function during short exposures at four different altitudes. METHODS: Ninety-one subjects were exposed to simulated altitudes of ground level, 1524, 2438, and 3658 m (5000, 8000, and 12,000 ft) in the Brooks City-Base altitude pressure chamber in a balanced design. Oxygen saturation, heart rate, and cognitive performance on seven different cognitive tasks were measured...
July 2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/27497480/multi-vitamin-b-supplementation-reverses%C3%A2-hypoxia-induced-tau-hyperphosphorylation-and-improves-memory-function-in-adult-mice
#20
Lixia Yu, Yuan Chen, Weiguang Wang, Zhonghai Xiao, Yan Hong
Hypobaric hypoxia (HH) leads to reduced oxygen delivery to brain. It could trigger cognitive dysfunction and increase the risk of dementia including Alzheimer's disease (AD). The present study was undertaken in order to examine whether B vitamins (B6, B12, folate, and choline) could exert protective effects on hypoxia-induced memory deficit and AD related molecular events in mice. Adult male Kunming mice were assigned to five groups: normoxic control, hypoxic model (HH), hypoxia+vitamin B6/B12/folate (HB), hypoxia+choline (HC), hypoxia+vitamin B6/B12/folate+choline (HBC)...
August 4, 2016: Journal of Alzheimer's Disease: JAD
keyword
keyword
64259
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"