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https://www.readbyqxmd.com/read/28339445/transforaminal-endoscopic-decompression-for-a-giant-epidural-gas-containing-pseudocyst-a-case-report-and-literature-review
#1
Bin Zhu, Liang Jiang, Xiao Guang Liu
The isolated epidural gas-containing pseudocyst is an uncommon pathogenic factor for severe pain of the lower limb as a result of nerve root compression. After reviewing these rare cases reported in the literature, we found that the name, pathogenesis, and treatment strategy of this pathology remained controversial. The most common treatment is conservative treatment or percutaneous aspiration which might result inpoor pain relief and high recurrence rates. Moreover, the patient who received open surgery had good clinical outcome; however, he or she might experience a significant soft tissue injury...
March 2017: Pain Physician
https://www.readbyqxmd.com/read/28338093/-210-pb-226-ra-disequilibria-in-young-gas-laden-magmas
#2
Mark Reagan, Simon Turner, Heather Handley, Michael Turner, Christoph Beier, John Caulfield, David Peate
We present new (238)U-(230)Th-(226)Ra-(210)Pb and supporting data for young lavas from southwest Pacific island arcs, Eyjafjallajökull, Iceland, and Terceira, Azores. The arc lavas have significant (238)U and (226)Ra excesses, whereas those from the ocean islands have moderate (230)Th and (226)Ra excesses, reflecting mantle melting in the presence of a water-rich fluid in the former and mantle melting by decompression in the latter. Differentiation to erupted compositions in both settings appears to have taken no longer than a few millennia...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28323592/measuring-uptake-and-elimination-of-nitrogen-in-humans-at-different-ambient-pressures
#3
Patrik Sundblad, Oskar Frånberg, Christoph Siebenmann, Mikael Gennser
BACKGROUND: To measure nitrogen (N2) wash-out and uptake requires elaborate set-ups, especially when doing the measurements at increased or decreased ambient pressure. Here we present a transportable device for quantifying N2 turnover in humans which can be used at different ambient pressures. METHODS: A modified close-circuit electronic rebreather was used to assess N2 turnover. Changes in N2 volume within the rebreathing circuit, reflecting N2 uptake or washout, were derived from the continuously monitored total system volume and the calculated volumes of oxygen and water vapor...
December 1, 2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28320890/a-biophysical-vascular-bubble-model-for-devising-decompression-procedures
#4
Ran Arieli, Abraham Marmur
Vascular bubble models, which present a realistic biophysical approach, hold great promise for devising suitable diver decompression procedures. Nanobubbles were found to nucleate on a flat hydrophobic surface, expanding to form bubbles after decompression. Such active hydrophobic spots (AHS) were formed from lung surfactants on the luminal aspect of ovine blood vessels. Many of the phenomena observed in these bubbling vessels correlated with those known to occur in diving. On the basis of our previous studies, which proposed a new model for the formation of arterial bubbles, we now suggest the biophysical model presented herein...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28296928/the-probability-and-severity-of-decompression-sickness
#5
Laurens E Howle, Paul W Weber, Ethan A Hada, Richard D Vann, Petar J Denoble
Decompression sickness (DCS), which is caused by inert gas bubbles in tissues, is an injury of concern for scuba divers, compressed air workers, astronauts, and aviators. Case reports for 3322 air and N2-O2 dives, resulting in 190 DCS events, were retrospectively analyzed and the outcomes were scored as (1) serious neurological, (2) cardiopulmonary, (3) mild neurological, (4) pain, (5) lymphatic or skin, and (6) constitutional or nonspecific manifestations. Following standard U.S. Navy medical definitions, the data were grouped into mild-Type I (manifestations 4-6)-and serious-Type II (manifestations 1-3)...
2017: PloS One
https://www.readbyqxmd.com/read/28217293/application-of-hyperbaric-oxygen-in-liver-transplantation
#6
REVIEW
Hu Lv, Cui-Hong Han, Xue-Jun Sun, Wen-Wu Liu
In recent years, hyperbaric oxygen (HBO) has been used in the treatment of a lot of diseases such as decompression sickness, arterial gas embolism, carbon dioxide poisoning, soft tissue infection, refractory osteomyelitis, and problematic wound, but little is known about its application in liver transplantation. Although several studies have been conducted to investigate the protective effects of HBO on liver transplantation and liver preservation, there are still some controversies on this issue, especially its immunomodulatory effect...
October 2016: Medical Gas Research
https://www.readbyqxmd.com/read/28114155/capnoperitoneum-during-peroral-endoscopic-myotomy-recognition-and-management-a-case-report
#7
Eric Lee, Jay B Brodsky, Homero Rivas, Karl Zheng, John G Brock-Utne
Peroral endoscopic myotomy (POEM) is a minimally invasive procedure for treating esophageal achalasia. During POEM, carbon dioxide is insufflated under pressure into the esophagus and stomach, which can cause clinically significant capnoperitoneum, capnomediastinum, or capnothorax. We present a case in which gas accumulation in the abdomen during POEM had adverse effects on ventilation. Once the cause was recognized, needle decompression of the abdomen led to immediate improvement in ventilation.
March 15, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28095955/preconditioning-to-reduce-decompression-stress-in-scuba-divers
#8
Peter Germonpré, Costantino Balestra
BACKGROUND: Using ultrasound imaging, vascular gas emboli (VGE) are observed after asymptomatic scuba dives and are considered a key element in the potential development of decompression sickness (DCS). Diving is also accompanied with vascular dysfunction, as measured by flow-mediated dilation (FMD). Previous studies showed significant intersubject variability to VGE for the same diving exposure and demonstrated that VGE can be reduced with even a single pre-dive intervention. Several preconditioning methods have been reported recently, seemingly acting either on VGE quantity or on endothelial inflammatory markers...
February 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/27965591/pre-dive-whole-body-vibration-better-reduces-decompression-induced-vascular-gas-emboli-than-oxygenation-or-a-combination-of-both
#9
Costantino Balestra, Sigrid Theunissen, Virginie Papadopoulou, Cedric Le Mener, Peter Germonpré, François Guerrero, Pierre Lafère
Purpose: Since non-provocative dive profiles are no guarantor of protection against decompression sickness, novel means including pre-dive "preconditioning" interventions, are proposed for its prevention. This study investigated and compared the effect of pre-dive oxygenation, pre-dive whole body vibration or a combination of both on post-dive bubble formation. Methods: Six healthy volunteers performed 6 no-decompression dives each, to a depth of 33 mfw for 20 min (3 control dives without preconditioning and 1 of each preconditioning protocol) with a minimum interval of 1 week between each dive...
2016: Frontiers in Physiology
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/27760561/acute-transfusion-related-abdominal-injury-in-trauma-patients-a-case-report
#11
P Michel, D Wähnert, M Freistühler, M G Laukoetter, S Rehberg, M J Raschke, P Garcia
BACKGROUND: Secondary abdominal compartment syndrome is well known as a life-threatening complication in critically ill patients in an intensive care unit. Massive crystalloid fluid resuscitation has been identified as the most important risk factor. The time interval from hospital admittance to the development of manifest abdominal compartment syndrome is usually greater than 24 hours. In the absence of any direct abdominal trauma, we observed a rapidly evolving secondary abdominal compartment syndrome shortly after hospital admittance associated with massive transfusion of blood products and only moderate crystalloid resuscitation...
October 19, 2016: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/27737486/do-environmental-conditions-contribute-to-narcosis-onset-and-symptom-severity
#12
P Lafère, C Balestra, W Hemelryck, F Guerrero, P Germonpré
Although many factors contributing to inert gas narcosis onset and severity have been put forward, the available evidence is not particularly strong. Using objective criteria, we have assessed brain impairment associated with narcosis under various environmental diving conditions. 40 volunteers performed a no-decompression dive (33 m for 20 min) either in a dry chamber, a pool or open sea. They were assessed by critical flicker fusion frequency before the dive, upon arriving at depth, 5 min before ascent, on surfacing and 30 min post-dive...
December 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27633737/gut-fermentation-seems-to-promote-decompression-sickness-in-humans
#13
Sébastien de Maistre, Nicolas Vallée, Emmanuel Gempp, Pierre Louge, Claude H B Duchamp, Jean-Eric Blatteau
Introduction Massive bubble formation after diving can lead to decompression sickness (DCS) that can result in neurological disorders. In experimental dives using hydrogen as the diluent gas, decreasing the body's H2 burden by inoculating hydrogen-metabolizing microbes into the gut reduces the risk of DCS. In contrast, we have shown that gut bacterial fermentation in rats on a standard diet promotes DCS through endogenous hydrogen production. So we set out to test these experimental results in humans. Materials and methods 39 divers admitted into our hyperbaric center with neurological DCS (Affected Divers) were compared with 39 healthy divers (Unaffected Divers)...
September 15, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27562522/updating-a-gas-dynamics-model-using-estimates-for-california-sea-lions-zalophus-californianus
#14
Matthew R Hodanbosi, Blair Sterba-Boatwright, Andreas Fahlman
Theoretical models are used to predict how breath-hold diving vertebrates manage O2, CO2, and N2 while underwater. One recent gas dynamics model used available lung and tracheal compliance data from various species. As variation in respiratory compliance significantly affects alveolar compression and pulmonary shunt, the current study objective was to evaluate changes in model output when using species-specific parameters from California sea lions (Zalophus californianus). We explored the effects of lung and dead space compliance on the uptake of N2, O2, and CO2 in various tissues during a series of hypothetical dives...
August 22, 2016: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/27548569/pressure-tuning-of-first-dimension-columns-in-comprehensive-two-dimensional-gas-chromatography
#15
Khan M Sharif, Chadin Kulsing, Philip J Marriott
The experimental approach and mechanism of pressure tuning (PT) are introduced for the first stage of a comprehensive two-dimensional gas chromatography (GC × GC) separation. The PT-GC × GC system incorporates a first dimension ((1)D) coupled column ensemble comprising a pair of (1)D columns ((1)D1 and (1)D2) connected via a microfluidic splitter device, allowing variable decompression of carrier gas across each (1)D column, and a conventional (2)D narrow bore column. By variation of junction pressure between the (1)D1 and (1)D2 columns, tunable total (1)D retentions of analytes are readily derived...
September 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27539496/evidence-for-the-infiltration-of-gas-bubbles-into-the-arterial-circulation-and-neuronal-injury-following-yo-yo-dives-in-pigs
#16
Dror Ofir, Yoav Yanir, Michael Mullokandov, Ben Aviner, Yehuda Arieli
"Yo-yo" diving may place divers at a greater risk of neurologic decompression illness (DCI). Using a rat model, we previously demonstrated that "yo-yo" diving has a protective effect against DCI. In the current study, we evaluated the risk of neurologic DCI following "yo-yo" dives in a pig model. Pigs were divided into four groups. The Control group (A) made a square dive, without excursions to the surface ("peeps"). Group B performed 2 "peeps", Group C performed 4 "peeps", and Group D did not dive at all. All dives were conducted on air to 5 atmospheres absolute, for 30 min bottom time...
August 18, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27504910/fizzy-extraction-of-volatile-and-semivolatile-compounds-into-the-gas-phase
#17
Cheng-Hao Chang, Pawel L Urban
Extraction of volatile and semivolatile compounds from liquid matrixes with high yields, and transferring the extracts to detectors in real time, is challenging. Common extraction procedures involve heating the samples to release the analytes to the gas phase and, in some cases, trapping the gas-phase analytes into sorbents or containers. Here, we propose a new method for fast extraction of volatile and semivolatile compounds from liquid matrixes. This method involves dissolution of a carrier gas in the liquid sample by applying a moderate overpressure (∼150 kPa) and stirring the sample...
September 6, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27493634/bubbles-quantified-in-vivo-by-ultrasound-relates-to-amount-of-gas-detected-post-mortem-in-rabbits-decompressed-from-high-pressure
#18
Yara Bernaldo de Quirós, Andreas Møllerløkken, Marianne B Havnes, Alf O Brubakk, Oscar González-Díaz, Antonio Fernández
The pathophysiological mechanism of decompression sickness is not fully understood but there is evidence that it can be caused by intravascular and autochthonous bubbles. Doppler ultrasound at a given circulatory location is used to detect and quantify the presence of intravascular gas bubbles as an indicator of decompression stress. In this manuscript we studied the relationship between presence and quantity of gas bubbles by echosonography of the pulmonary artery of anesthetized, air-breathing New Zealand White rabbits that were compressed and decompressed...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27490679/a-case-of-abdominal-compartment-syndrome-derived-from-simple-elongated-sigmoid-colon-in-an-elderly-man
#19
Masaaki Shida, Yoshihiko Kitajima, Masayuki Tanaka, Hiroharu Tsuji
INTRODUCTION: Abdominal compartment syndrome or intra-abdominal hypertension may occur after intra-abdominal events, but their etiology and clinical signs remain unclear. We report a case of abdominal compartment syndrome in an elderly patient without other risk factors. PRESENTATION OF CASE: An 86-year-old man had been admitted to our hospital several times for a dilated sigmoid colon with elongation, and had complained about abdominal pain and abdominal fullness...
2016: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/27453644/double-j-stenting-a-rewarding-option-in-the-management-of-emphysematous-pyelonephritis
#20
Debiprasad Das, Dilip Kumar Pal
CONTEXT: Emphysematous pyelonephritis (EPN) is an acute necrotizing inflammation of renal parenchyma and peri-nephric tissue characterized by gas formation. In this study, we evaluated the outcome of EPN cases by medical management with or without renal decompression. MATERIALS AND METHODS: We have observed prospectively 15 cases of EPN admitted in our institute in respect to age, sex, mode of presentation, presence of comorbidity, laboratory profile, urine-analysis, and outcome after medical management and drainage procedures...
July 2016: Urology Annals
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