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Gas decompression

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https://www.readbyqxmd.com/read/29317768/ultrafast-syn-eruptive-degassing-and-ascent-trigger-high-energy-basic-eruptions
#1
Marisa Giuffrida, Marco Viccaro, Luisa Ottolini
Lithium gradients in plagioclase are capable of recording extremely short-lived processes associated with gas loss from magmas prior to extrusion at the surface. We present SIMS profiles of the 7Li/30Si ion ratio in plagioclase crystals from products of the paroxysmal sequence that occurred in the period 2011-2013 at Mt. Etna (Italy) in an attempt to constrain the final ascent and degassing processes leading to these powerful eruptions involving basic magma. The observed Li concentrations reflect cycles of Li addition to the melt through gas flushing, and a syn-eruptive stage of magma degassing driven by decompression that finally produce significant Li depletion from the melt...
January 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29241237/delayed-hyperbaric-intervention-in-life-threatening-decompression-illness
#2
Michael Fm Perez, Janet V Ongkeko Perez, April R Serrano, Maravic P Andal, Maria Cc Aldover
Arterial gas embolism is a catastrophic event. Bubbles in the arterial circulation may lodge in the brain and cause infarction in the affected area and/or in a coronary vessel causing acute myocardial ischaemia. There is no well-defined window of time beyond which a response to hyperbaric oxygen is not expected. Major improvement may occur if the patient is treated as soon as possible, but is less likely in divers with severe decompression illness who have delayed intervention. We report on a 51-year-old, male rebreather diver who suffered loss of consciousness and cardiovascular collapse within minutes of a 30-metre deep dive at a remote Micronesian dive site...
December 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/29216947/-effects-of-active-abdominal-compression-decompression-cpr-on-oxygen-metabolism-and-prognosis-in-patients-with-cardiac-arrest
#3
Xin Sha, Sisen Zhang, Hongwei Wang, Yingxin Cen, Wei Song, Jing Li, Lixiang Wang
OBJECTIVE: To analyze the effect of active abdominal compression-decompression cardiopulmonary resuscitation (AACD-CPR) and standard cardiopulmonary resuscitation (STD-CPR) on oxygen metabolism and prognosis of patient with cardiac arrest (CA), and to evaluate the treatment effect of AACD-CPR. METHODS: Patients with CA, CA time less than 30 minutes, and without STD-CPR and AACD-CPR contraindications admitted to the Zhengzhou People's Hospital from October 1st 2015 to May 31st 2017 were enrolled...
December 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29212105/-german-society-of-gastroenterology-digestive-and-metabolic-diseases-dgvs-position-statement-on-endoscopic-decompression-in-acute-ileus
#4
Martin Götz, Georg Braun, Ralf Jakobs, Helmut Messmann, Eduard F Stange, Markus M Lerch
In patients with ileus with dilated intestine in imaging studies, endoscopic decompression appears a feasible option. However, its use is often uncritical and without scientific evidence. Before considering endoscopic intervention, CT-imaging should differentiate between mechanical obstruction and paralytic ileus/intestinal pseudo-obstruction. Tumor diagnosis and localisation are essential because the latter determines the choice of the decompression procedure. Coecal dilatation of more than 12 cm indicates an increased risk of perforation...
December 2017: Zeitschrift Für Gastroenterologie
https://www.readbyqxmd.com/read/29196510/necrotizing-enterocolitis
#5
Barrie S Rich, Stephen E Dolgin
Necrotizing enterocolitis (NEC) is a frequently encountered condition in the premature neonate, which can have devastating effects. The signs and symptoms of NEC are variable and can be confused with those of sepsis. An abdominal radiograph is often obtained for diagnosis, and findings that indicate NEC include pneumatosis and portal venous gas. The treatment of NEC includes gastrointestinal rest, gastric decompression, broad-spectrum intravenous antibiotics, and systemic support. A finding of pneumoperitoneum signifies intestinal perforation, which requires surgical intervention...
December 2017: Pediatrics in Review
https://www.readbyqxmd.com/read/29178494/microvascular-characteristics-of-the-acoustic-fats-novel-data-suggesting-taxonomic-differences-between-deep-and-shallow-diving-odontocetes
#6
Molly K Gabler, D Mark Gay, Andrew J Westgate, Heather N Koopman
Odontocetes have specialized mandibular fats, the extramandibular (EMFB) and intramandibular fat bodies (IMFB), which function as acoustic organs, receiving and channeling sound to the ear during hearing and echolocation. Recent strandings of beaked whales suggest that these fat bodies are susceptible to nitrogen (N2 ) gas embolism and empirical evidence has shown that the N2 solubility of these fat bodies is higher than that of blubber. Since N2 gas will diffuse from blood into tissue at any blood/tissue interface and potentially form gas bubbles upon decompression, it is imperative to understand the extent of microvascularity in these specialized acoustic fats so that risk of embolism formation when diving can be estimated...
November 27, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/29175087/iso-risk-air-no-decompression-limits-after-scoring-marginal-decompression-sickness-cases-as-non-events
#7
F Gregory Murphy, Ashleigh J Swingler, Wayne A Gerth, Laurens E Howle
Decompression sickness (DCS) in humans is associated with reductions in ambient pressure that occur during diving, aviation, or certain manned spaceflight operations. Its signs and symptoms can include, but are not limited to, joint pain, radiating abdominal pain, paresthesia, dyspnea, general malaise, cognitive dysfunction, cardiopulmonary dysfunction, and death. Probabilistic models of DCS allow the probability of DCS incidence and time of occurrence during or after a given hyperbaric or hypobaric exposure to be predicted based on how the gas contents or gas bubble volumes vary in hypothetical tissue compartments during the exposure...
November 15, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29161578/probabilistic-pharmacokinetic-models-of-decompression-sickness-in-humans-part-2-coupled-perfusion-diffusion-models
#8
F Gregory Murphy, Ethan A Hada, David J Doolette, Laurens E Howle
Decompression sickness (DCS) can be experienced following a reduction in ambient pressure; such as that associated with diving or ascent to high altitudes. DCS is believed to result when supersaturated inert gas dissolved in biological tissues exits solution and forms bubbles. Models to predict the probability of DCS are typically based on nitrogen and/or helium gas uptake and washout in several theoretical tissues, each represented by a single perfusion-limited compartment. It has been previously shown that coupled perfusion-diffusion compartments are better descriptors than solely perfusion-based models of nitrogen and helium uptake and elimination kinetics observed in the brain and skeletal muscle of sheep...
November 15, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29157337/simulated-high-altitude-helium-oxygen-diving
#9
Lu Shi, Yan-Meng Zhang, Katsuura Tetsuo, Zhong-Yuan Shi, Yi-Qun Fang, Petar J Denoble, Yang-Yang Li
BACKGROUND: Experience with commercial heliox diving at high altitude is limited. The purpose of this study was to evaluate the effects of acute high-altitude exposure on fitness to dive and the safety of decompression after heliox diving while using U.S. Navy heliox decompression tables with Cross correction. METHOD: Four professional male divers were consecutively decompressed in a hypo- and hyperbaric chamber to altitudes of 3000 m (9842.5 ft), 4000 m (13,123...
December 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29109872/severe-decompression-illness-case-report-prehospital-recognition-and-regional-transport-considerations
#10
Julie Estrada, David Meurer, Kevin De Boer, Karl Huesgen
A 46-year-old male presented to our tertiary care emergency department (ED) with shortness of breath and chest pain following an uneventful four-hour SCUBA dive at 100 feet. His prehospital emergency medical services (EMS) assessment revealed transient hypotension and hypoxia. He later developed progressive skin mottling. Serology was significant for acute kidney injury, transaminitis, hemoconcentration, and hypoxia on an arterial blood gas. Computed tomography (CT) angiography demonstrated intravascular gas throughout the mesenteric and pulmonary arteries as well as the portal venous system...
2017: Case Reports in Emergency Medicine
https://www.readbyqxmd.com/read/29079345/postoperative-respiratory-effects-of-intravenous-fentanyl-compared-to-intravenous-methadone-in-dogs-following-spinal-surgery
#11
Maria Amengual, Hannah Leigh, Eva Rioja
OBJECTIVE: To evaluate the 24-hour postoperative respiratory effects of either intravenous fentanyl administered as a constant rate infusion or boluses of methadone, in dogs following spinal surgery, assessed by serial arterial blood gas analyses. STUDY DESIGN: Prospective, randomized clinical study. ANIMALS: Thirty-two healthy dogs (American Society of Anesthesiologists I/II) anaesthetized for elective caudal thoracic and/or lumbar decompression spinal surgery...
April 8, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/29051628/deadly-acute-decompression-sickness-in-risso-s-dolphins
#12
A Fernández, E Sierra, J Díaz-Delgado, S Sacchini, Y Sánchez-Paz, C Suárez-Santana, M Arregui, M Arbelo, Y Bernaldo de Quirós
Diving air-breathing vertebrates have long been considered protected against decompression sickness (DCS) through anatomical, physiological, and behavioural adaptations. However, an acute systemic gas and fat embolic syndrome similar to DCS in human divers was described in beaked whales that stranded in temporal and spatial association with military exercises involving high-powered sonar. More recently, DCS has been diagnosed in bycaught sea turtles. Both cases were linked to human activities. Two Risso's dolphin (Grampus griseus) out of 493 necropsied cetaceans stranded in the Canary Islands in a 16-year period (2000-2015), had a severe acute decompression sickness supported by pathological findings and gas analysis...
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28974936/dive-risk-factors-gas-bubble-formation-and-decompression-illness-in-recreational-scuba-diving-analysis-of-dan-europe-dsl-data-base
#13
Danilo Cialoni, Massimo Pieri, Costantino Balestra, Alessandro Marroni
Introduction: The popularity of SCUBA diving is steadily increasing together with the number of dives and correlated diseases per year. The rules that govern correct decompression procedures are considered well known even if the majority of Decompression Sickness (DCS) cases are considered unexpected confirming a bias in the "mathematical ability" to predict DCS by the current algorithms. Furthermore, little is still known about diving risk factors and any individual predisposition to DCS. This study provides an in-depth epidemiological analysis of the diving community, to include additional risk factors correlated with the development of circulating bubbles and DCS...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28971104/wave-intensity-analysis-and-its-application-to-the-coronary-circulation
#14
REVIEW
C J Broyd, J E Davies, J E Escaned, A Hughes, K Parker
Wave intensity analysis (WIA) is a technique developed from the field of gas dynamics that is now being applied to assess cardiovascular physiology. It allows quantification of the forces acting to alter flow and pressure within a fluid system, and as such it is highly insightful in ascribing cause to dynamic blood pressure or velocity changes. When co-incident waves arrive at the same spatial location they exert either counteracting or summative effects on flow and pressure. WIA however allows waves of different origins to be measured uninfluenced by other simultaneously arriving waves...
March 31, 2017: Global Cardiology Science & Practice
https://www.readbyqxmd.com/read/28900861/acute-kidney-injury-caused-by-decompression-illness-successfully-treated-with-hyperbaric-oxygen-therapy-and-temporary-dialysis
#15
Arata Hibi, Keisuke Kamiya, Takahisa Kasugai, Keisuke Kamiya, Satoru Kominato, Chiharu Ito, Toshiyuki Miura, Katsushi Koyama
A 52-year-old Japanese male professional diver was referred to our hospital for decompression illness (DCI). After 1 h of diving operation at 20 m below sea level, he complained of dyspnea, chest pain, and abdominal pain. He dove again, intending to ease the symptoms, but the symptoms were never relieved. He dove for a total of 4 h. No neurological abnormalities were observed. Computed tomography images revealed portal venous gas and mesenteric venous gas, in addition to bubbles in the femoral veins, pelvis, lumbar canal, intracranial sinuses, and joints...
November 2017: CEN Case Reports
https://www.readbyqxmd.com/read/28880140/-diving-accident-induced-arterial-gas-embolism
#16
P D Nijk, T P van Rees Vellinga, J M van Lieshout, M I Gaakeer
BACKGROUND: During scuba diving, nitrogen dissolves into the body tissues due to elevated pressure under water. During a sudden drop in pressure due to a rapid return to the water surface, arterial gas embolism can arise from pulmonary barotrauma. In a later phase, nitrogen bubbles can also arise in the venous circulation (decompression sickness). Arterial bubbles can incur vascular damage, obstruction, hypoxia and infarction. CASE DESCRIPTION: A 53-year-old healthy sport diver presented at the emergency department in a hypovolemic shock with progressive paresis of all the extremities...
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/28861003/nanobubbles-form-at-active-hydrophobic-spots-on-the-luminal-aspect-of-blood-vessels-consequences-for-decompression-illness-in-diving-and-possible-implications-for-autoimmune-disease-an-overview
#17
REVIEW
Ran Arieli
Decompression illness (DCI) occurs following a reduction in ambient pressure. Decompression bubbles can expand and develop only from pre-existing gas micronuclei. The different hypotheses hitherto proposed regarding the nucleation and stabilization of gas micronuclei have never been validated. It is known that nanobubbles form spontaneously when a smooth hydrophobic surface is submerged in water containing dissolved gas. These nanobubbles may be the long sought-after gas micronuclei underlying decompression bubbles and DCI...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28839003/acute-hypoxia-in-a-simulated-high-altitude-airdrop-scenario-due-to-oxygen-system-failure
#18
William Ottestad, Tor Are Hansen, Gaurav N Pradhan, Jan Stepanek, Lars Øivind Høiseth, Jan Ivar Kåsin
High Altitude High Opening (HAHO) is a military operational procedure in which parachute jumps are performed at high altitude requiring supplemental oxygen, putting personnel at risk of acute hypoxia in the event of oxygen equipment failure. This study was initiated by the Norwegian Army in order to evaluate potential outcomes during failure of oxygen supply, and to explore physiology during acute severe hypobaric hypoxia. A simulated HAHO without supplemental oxygen was carried out in a hypobaric chamber with decompression to 30 000 ft (9144 m) and then recompression to ground level with a descent rate of 1000 ft/min (305 m/min)...
August 24, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28820265/pressure-induced-polymerization-and-disproportionation-of-li2c2-accompanied-with-irreversible-conductivity-enhancement
#19
Lijuan Wang, Xiao Dong, Yajie Wang, Haiyan Zheng, Kuo Li, Xing Peng, Ho-Kwang Mao, Changqing Jin, Yufei Meng, Mingquan Huang, Zhisheng Zhao
Li2C2 has the highest theoretical capacity (1400 mA·h·g(-1)) as the electrode material for Li-ion battery, but suffers from low conductivity. Here we found that under external pressure its conductivity was irreversibly enhanced by 10(9)-fold. To explain that, we performed X-ray diffraction, Raman, IR, gas chromatography-mass spectrometry, and theoretical investigations under external pressure. We found that the C2(2-) anions approached to each other and polymerized upon compression, which is responsible for the irreversible enhancement of conductivity...
August 24, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28777907/elimination-of-ct-detected-gas-bubbles-derived-from-decompression-illness-with-abdominal-symptoms-after-a-short-hyperbaric-oxygen-treatment-in-a-monoplace-chamber-a-case-report
#20
Takuya Oyaizu, Mitsuhiro Enomoto, Toshihide Tsujimoto, Yasushi Kojima, Atsushi Okawa, Kazuyoshi Yagishita
We report the case of a 54-year-old male compressed-air worker with gas bubbles detected by computed tomography (CT). He had complained of strong abdominal pain 30 minutes after decompression after working at a pressure equivalent to 17 meters of sea water for three hours. The initial CT images revealed gas bubbles in the intrahepatic portal vein, pulmonary artery and bilateral femoral vein. After the first hyperbaric oxygen treatment (HBO₂ at 2.5 atmospheres absolute/ATA for 150 minutes), no bubbles were detected on repeat CT examination...
March 2017: Undersea & Hyperbaric Medicine: Journal of the Undersea and Hyperbaric Medical Society, Inc
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