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Altitude & Ultrasound

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9 papers 0 to 25 followers
Patrick Goeres, Frederick A Zeiler, Bertram Unger, Dimitrios Karakitsos, Lawrence M Gillman
BACKGROUND: Ultrasound assessment of optic nerve sheath diameter (ONSD) has been suggested as a non-invasive measure of intracranial pressure. Numerous small studies suggest its validity; however, discrepancy exists around normal values for ONSD. In this study we sought to define a normal value range for ONSD in a population of healthy adult volunteers. METHODS: ONSD was measured in healthy adult volunteers and a normal range was defined using descriptive statistics...
February 2016: Journal of Critical Care
Julie Dubourg, Etienne Javouhey, Thomas Geeraerts, Mahmoud Messerer, Behrouz Kassai
PURPOSE: To evaluate the diagnostic accuracy of ultrasonography of optic nerve sheath diameter (ONSD) for assessment of intracranial hypertension. METHODS: Systematic review without language restriction based on electronic databases, with manual review of literature and conference proceedings until July 2010. Studies were eligible if they compared ultrasonography of ONSD with intracranial pressure (ICP) monitoring. Data were extracted independently by three authors...
July 2011: Intensive Care Medicine
Maude Pagé, Christine Henri, Pierre Pagé, Claude Sauvé, Erick Schampaert
BACKGROUND: High altitude (HA) pulmonary edema (PE) results from complex and misunderstood interactions between adaptation mechanisms. We assessed the occurrence of subclinical PE and brain natriuretic peptide (BNP) levels among nonacclimatized individuals during an expedition on Mount Elbrus (5642 m). METHODS: Seven subjects underwent assessment of vital signs, Lake Louise Score, ultrasound lung comets using handheld echography and circulating BNP using capillary testing at different stages of ascension, in addition to baseline echocardiography...
August 2015: Canadian Journal of Cardiology
Maude Pagé, Claude Sauvé, Karim Serri, Pierre Pagé, Yalin Yin, Erick Schampaert
BACKGROUND: Data regarding the effect of high altitude on heart function are sparse and conflicting. We aimed to assess the right and left ventricular responses to altitude-induced hypoxia and the occurrence of subclinical pulmonary edema. METHODS: Echocardiography was performed according to protocol on 14 subjects participating in an expedition in Nepal, at 3 altitude levels: Montreal (30 m), Namche Bazaar (3450 m), and Chukkung (4730 m). Systematic lung ultrasound was performed to detect ultrasound lung comets...
October 2013: Canadian Journal of Cardiology
Yashvi Wimalasena, Jeremy Windsor, Mark Edsell
High altitude pulmonary edema is a life-threatening condition that remains a concern for climbers and clinicians alike. Within the last decade, studies have shown ultrasonography to be valuable in the accurate diagnosis of a variety of lung pathologies, including cardiogenic pulmonary edema, pleural effusion, pneumothorax, and lung consolidation. Recently, studies conducted in remote areas have demonstrated that ultrasound lung comets can be used as a measure of subacute pulmonary edema and high altitude pulmonary edema in climbers ascending to altitude...
June 2013: Wilderness & Environmental Medicine
Pierre Bouzat, Guillaume Walther, Thomas Rupp, Gregory Doucende, Jean-François Payen, Patrick Levy, Samuel Verges
The time course of asymptomatic pulmonary oedema during high-altitude exposure and its potential relationship with changes in cardiac function remain to clarify. Eleven volunteers were rapidly exposed to 4350m during a 4-day period. Each subject received clinical examination and thoracic ultrasonography to assess ultrasound lung comets (USLC) on day 1, 2 and 3 after arrival. Echocardiography was performed on day 2 and 4 at 4350m. All subjects had a significant increase in the number of USLC on day 1 (n=8±3), day 2 (n=7±4) and day 3 (n=3±2) compared to sea level (n=1±1) (P<0...
March 1, 2013: Respiratory Physiology & Neurobiology
Lorenza Pratali, Marco Cavana, Rosa Sicari, Eugenio Picano
OBJECTIVE: The ultrasound lung comets detected by chest sonography are a simple, noninvasive, semiquantitative sign of increased extravascular lung water. The aim of this study was to evaluate, by chest sonography, the incidence of interstitial pulmonary edema in recreational high-altitude climbers. DESIGN: Observational study. SUBJECTS: Eighteen healthy subjects (mean age 45 +/- 10 yrs, ten males) participating in a high-altitude trek in Nepal...
September 2010: Critical Care Medicine
Christian Otto, Douglas R Hamilton, Benjamin D Levine, Craig Hare, Ashot E Sargsyan, Peter Altshuler, Scott A Dulchavsky
OBJECTIVE: Mountaineers face a variety of health risks at altitude including pulmonary edema; portable ultrasound may be used to diagnose high altitude pulmonary edema. This report tests the functionality of electronic equipment in a hypobaric test environment and the ability of remotely guided nonexperts to use ultrasound to evaluate respiratory status on Mt Everest. METHODS: Two ultrasound devices and associated video equipment were tested in a cooled (4 degrees C-5 degrees C) hypobaric chamber to 27000 feet (8230 m) before travel to Mt Everest...
2009: Wilderness & Environmental Medicine
Peter J Fagenholz, Jonathan A Gutman, Alice F Murray, Vicki E Noble, Stephen H Thomas, N Stuart Harris
BACKGROUND: The comet-tail technique of chest ultrasonography has been described for the diagnosis of cardiogenic pulmonary edema. This is the first report describing its use for the diagnosis and monitoring of high-altitude pulmonary edema (HAPE), the leading cause of death from altitude illness. METHODS: Eleven consecutive patients presenting to the Himalayan Rescue Association clinic in Pheriche, Nepal (4,240 m) with a clinical diagnosis of HAPE underwent one to three chest ultrasound examinations using the comet-tail technique to determine the presence of extravascular lung water (EVLW)...
April 2007: Chest
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