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Gas decompression

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
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...
October 13, 2016: International Journal of Sports Medicine
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
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
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
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
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
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
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
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
Sean McIntire, Lee Boujie
Inner ear barotrauma can occur when the gas-filled chambers of the ear have difficulty equalizing pressure with the outside environment after changes in ambient pressure. This can transpire even with small pressure changes. Hypobaric or hyperbaric environments can place significant stress on the structures of the middle and inner ear. If methods to equalize pressure between the middle ear and other connected gas-filled spaces (i.e., Valsalva maneuver) are unsuccessful, middle ear overpressurization can occur...
2016: Journal of Special Operations Medicine: a Peer Reviewed Journal for SOF Medical Professionals
Kazushi Nakai, Tatsuya Hiraku, Izumi Fujimoto, Tsuyoshi Yoshimura
The efficacy of decompression treatment as a non-destructive method to control larvae of the powderpost beetle, Lyctus africanus Lesne, was evaluated in the laboratory using various combinations of two pressure levels, 1.1 kPa and 40 kPa, and three temperature levels, 20, 25, and 40 °C. Larval mortality generally depended on weight reduction while decreases in the oxygen level had relatively little effect. The lower pressure, 1.1 kPa, significantly affected mortality, and no larvae survived after 12 h of this pressure treatment, at 25 °C...
2016: Insects
Hee Duck Kim, Sang Hwan Lee, Huisu Eom, Young Joong Kang
We report here the first case of liver injury in a 51-year-old man following a dive to a depth of 40 meters. He presented with typical neurological symptoms affecting the lower limbs. Five days later, he experienced delayed abdominal pain, followed by rapidly progressive liver and adjacent organ injury due to air emboli in the intrahepatic portal vein. He received supportive care and hyperbaric therapy with a U.S. Navy Treatment Table 6 and recovered. Decompression sickness is a disease of protean manifestations...
May 2016: Undersea & Hyperbaric Medicine: Journal of the Undersea and Hyperbaric Medical Society, Inc
Kiyonori Kanemitsu, Yasuo Sumi, Kimihiro Yamashita, Masashi Ymamoto, Shingo Kanaji, Taro Oshikiri, Tetsu Nakamura, Satoshi Suzuki, Akihiro Toyokawa, Yoshihiro Kakeji
BACKGROUND: It is debatable whether laparoscopic surgery is suitable for obstructive colorectal cancer. MATERIALS AND METHODS: We retrospectively reviewed the clinical and oncological effectiveness of laparoscopic surgery after tube decompression for obstructive colorectal cancer in 54 patients (18 laparoscopic resections, 36 open resections). RESULTS: There were no significant differences between groups with respect to mean size, location, depth, and stage of tumor, median operating times, or median number of lymph nodes retrieved...
August 2016: Surgical Laparoscopy, Endoscopy & Percutaneous Techniques
Jml Williamson, D Mahon
Acute gastric dilatation is a rare cause of gas within the hepatic portal vein, but one that is important to recognise as prompt decompression via a nasogastric tube is usually successful in resolving the situation. We report the rare case of a 68-year-old man with spontaneous acute gastric dilatation 50 minutes after a dobutamine stress echo that resulted in pneumoporta. The patient had a Nissen's fundoplication 18 months previously; patients with previous antireflux surgery or who have a degree of gastric outlet obstruction may be at increased risk of this unusual condition...
July 7, 2016: Annals of the Royal College of Surgeons of England
Antoine Mboyo, Pauline Clermidi, Guillaume Podevin, Dariusz Patkowski, Maciej Baglaj, Sylwester Gerus, Abdelfetah Lalioui, Stéphan de Napoli-Cocci, Michel Robert
BACKGROUND: Pyloric atresia (PA) is a rare condition, and may be misdiagnosed and especially confused for duodenal atresia pre-operatively. We looked for clues to avoiding pre-operative misdiagnosis and hence allow the best neonatal medical and surgical management. METHODS: A retrospective case-note review was carried out of the five patients managed in four centres with the diagnosis of isolated PA. We focused on antenatal ultrasound findings, postnatal clinical and radiological features, operative findings, surgical procedures and outcomes...
April 2016: Acta Chirurgica Belgica
W Alexander Fox-Alvarez, J Brad Case, Kirsten L Cooke, Fernando L Garcia-Pereira, Gareth J Buckley, Eric Monnet, Beau B Toskich
OBJECTIVE To evaluate a percutaneous, continuous gastric decompression technique for dogs involving a temporary T-fastener gastropexy and self-retaining decompression catheter. ANIMALS 6 healthy male large-breed dogs. PROCEDURES Dogs were anesthetized and positioned in dorsal recumbency with slight left-lateral obliquity. The gastric lumen was insufflated endoscopically until tympany was evident. Three T-fasteners were placed percutaneously into the gastric lumen via the right lateral aspect of the abdomen, caudal to the 13th rib and lateral to the rectus abdominis muscle...
July 2016: American Journal of Veterinary Research
Silvia Guenzani, Diego Mereu, Mark Messersmith, Diego Olivari, Mario Arena, Andrea Spanò
INTRODUCTION: Recreational technical diving, including the use of helium-based mixes (trimix) and the experimentation of new decompression algorithms, has become increasingly popular. Inner-ear decompression sickness (DCS) can occur as an isolated clinical entity or as part of a multi-organ presentation in this population. Physiological characteristics of the inner ear make it selectively vulnerable to DCS. The inner ear has a slower gas washout than the brain thus potentially making it more vulnerable to deleterious effects of any bubbles that cross a persistent foramen ovale (PFO) and enter the basilar artery, whilst the inner ear remains supersaturated but the brain does not...
June 2016: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
Janne Tikkinen, Tomi Wuorimaa, Martti A Siimes
INTRODUCTION: Inert gas narcosis (IGN) impairs cognitive performance and some divers are more susceptible to IGN than others. We compared the sensitivity of two reaction time tests to detect changes in performance at pressure and compared these results with critical flicker fusion frequency (CFF) changes at the same ambient pressures. METHODS: The study assessed simple reaction time (RT), mean time correct of the discrimination reaction time (MTC) and CFF in 30 professional divers breathing air at 101 kPa and 608 kPa in a hyperbaric chamber...
June 2016: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
Andrew McGregor, Khaldoun Bekdache, Laura Choi
INTRODUCTION: Pneumatosis intestinalis (PI) and hepatic portal venous gas (HPVG) are radiographic signs of questionable bowel ischemia. Pneumatosis intestinalis can be associated with possible benign conditions such as obstructive airway disease. We present a patient who demonstrated clinical signs of overt sepsis with corresponding radiological findings of PI and HPVG concering for possible small or large bowel ischemia. However at exploration, no sign of small or large bowel injury or ischemia could be detected...
May 2016: Connecticut Medicine
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