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Airplane altitude changes

Akiyuki Hiraga, Yuya Aotsuka, Kyosuke Koide, Satoshi Kuwabara
Background Reversible cerebral vasoconstriction syndrome (RCVS) is characterized by segmental vasospasm. Vasoactive agents and childbirth have been reported as precipitating factors for RCVS; however, RCVS induced by altitude change or air travel has rarely been reported. Case We present a case of a 74-year-old woman who presented with thunderclap headache during airplane descent. Magnetic resonance angiography demonstrated segmental vasoconstriction that improved 9 days after onset. Conclusion These findings indicate that airplane descent may be a trigger of RCVS...
October 2017: Cephalalgia: An International Journal of Headache
Michael F Harrison, Paul Anderson, Andrew Miller, Kathy O'Malley, Maile Richert, Jacob Johnson, Bruce D Johnson
UNLABELLED: Exposure to altitudes >2500 m can result in acute mountain sickness (AMS), a mild and usually self-limiting condition. Research has attempted to identify factors associated with developing AMS without controlling important factors related to the ascent or collecting a comprehensive set of variables. OBJECTIVES: The Antarctic Study of Altitude Physiology (ASAP) investigated variables associated with the development of AMS in adults experiencing rapid passive transport to altitude by airplane...
2013: BMJ Open
Tiffany Murano, Adam D Fox, Devashish Anjaria
BACKGROUND: Patients with sickle cell trait (SCT) generally suffer few effects of sickle cell disease. Acute splenic syndrome is a rare but well-documented complication of SCT that can present in the setting of low oxygen tension that occurs with major changes in altitude, either by unpressurized air flight or ground travel such as mountain climbing. OBJECTIVE: Our objective was to increase emergency physician awareness of the rare diagnosis of altitude-induced splenic infarction in patients with SCT by presenting and reviewing recorded literature...
November 2013: Journal of Emergency Medicine
Hayrunnisa Bolay, Alan Rapoport
Although atmospheric weather changes are often listed among the common migraine triggers, studies to determine the specific weather component(s) responsible have yielded inconsistent results. Atmospheric pressure change produces air movement, and low pressure in particular is associated with warm weather, winds, clouds, dust, and precipitation, but how this effect might generate migraine is not immediately obvious. Humans are exposed to low atmospheric pressure in situations such as ascent to high altitude or traveling by airplane in a pressurized cabin...
October 2011: Headache
Marc Dalecki, Otmar Bock, Simon Guardiera
BACKGROUND: We have previously shown that subjects produce exaggerated manual forces in +3 Gz. When subjects execute discrete flight path changes in a flight simulator, their performance is less stable in +3 Gz than in +1 Gz. Here we explore whether Gz-related deficits are found with continuous flight path changes. METHODS: Novice subjects and fighter pilots sat in a high-fidelity flight simulator equipped with the reproduction of the Eurofighter 2000 cockpit, including the realistic flight stick, and pursued continuous altitude changes of a target airplane in +1 Gz and +3 Gz...
May 2010: Aviation, Space, and Environmental Medicine
Simon Guardiera, Marc Dalecki, Otmar Bock
INTRODUCTION: Earlier studies have shown that naïve subjects and experienced jet pilots produce exaggerated manual forces when exposed to increased acceleration (+Gz). This study was designed to evaluate whether this exaggeration affects the stability of simulated flight path control. METHODS: We evaluated naïve subjects' performance in a flight simulator which either remained stationary (+1 Gz), or rotated to induce an acceleration in accordance to the simulated flight path with a mean acceleration of about +3 Gz...
April 2010: Aviation, Space, and Environmental Medicine
Andrew M Luks
As medical care and the quality of life for patients with lung disease improve, many of these individuals may engage in various forms of travel, including, possibly, travel to high altitude. Because the hypobaric hypoxia at high altitude may cause severe hypoxemia or impaired exercise tolerance in these patients, clinicians may be asked to assess whether they should use supplemental oxygen during their planned sojourn. This review considers this question in greater detail. After considering how the issue is approached in commercial airplane flight, we consider changes in oxygenation in lung disease patients in ambient hypoxia, the complications associated with such changes, tools for predicting the degree of hypoxemia at high altitude and important logistical issues associated with traveling with supplemental oxygen...
2009: High Altitude Medicine & Biology
Iu I Voronkov, I I Pelevina, V V Tsetlin, A N Osipov, N I Riabchenko, A M Serebrianyĭ, V Ia Gotlib, N Iu Vorob'eva, M M Antoshina, V A Bondarenko
The issues of radiation risk evaluation were addressed in the investigation of cytogenetic and molecular-biological changes in lymphocytes of cosmonauts and pilots of high-altitude airplanes. The goal was to determine individual sensitivity to the flight conditions and an additional factor (lymphocyte exposure to 1 Gy in situ), and adaptability as an index of induction of cell and organism resistance to extreme conditions.
May 2008: Aviakosmicheskaia i Ekologicheskaia Meditsina, Aerospace and Environmental Medicine
William D Toff, Chris I Jones, Isobel Ford, Robert J Pearse, Henry G Watson, Stephen J Watt, John A S Ross, David P Gradwell, Anthony J Batchelor, Keith R Abrams, Joost C M Meijers, Alison H Goodall, Michael Greaves
CONTEXT: The link between long-haul air travel and venous thromboembolism is the subject of continuing debate. It remains unclear whether the reduced cabin pressure and oxygen tension in the airplane cabin create an increased risk compared with seated immobility at ground level. OBJECTIVE: To determine whether hypobaric hypoxia, which may be encountered during air travel, activates hemostasis. DESIGN, SETTING, AND PARTICIPANTS: A single-blind, crossover study, performed in a hypobaric chamber, to assess the effect of an 8-hour seated exposure to hypobaric hypoxia on hemostasis in 73 healthy volunteers, which was conducted in the United Kingdom from September 2003 to November 2005...
May 17, 2006: JAMA: the Journal of the American Medical Association
D Terrance Booth, Samuel E Cox, Robert D Berryman
Managers need measurements and resource managers need the length/width of a variety of items including that of animals, logs, streams, plant canopies, man-made objects, riparian habitat, vegetation patches and other things important in resource monitoring and land inspection. These types of measurements can now be easily and accurately obtained from very large scale aerial (VLSA) imagery having spatial resolutions as fine as 1 millimeter per pixel by using the three new software programs described here. VLSA images have small fields of view and are used for intermittent sampling across extensive landscapes...
January 2006: Environmental Monitoring and Assessment
Victoria Atkinson, Liesly Lee
A 28-year-old man developed severe headache associated with changes in altitude during ascent and descent while flying in an airplane. Jabbing pain over the forehead and between the eyes began within minutes of ascent. It resolved once a cruising altitude was reached, but then returned at the start of descent.
May 2004: Headache
David R Holmes, Howard Cohen, William E Katz, Guy S Reeder
The recognition, evaluation and treatment of patent foramen ovale has attracted increasing interest as the importance and frequency of paradoxical embolism has become better understood. The interest in this field has been driven largely by the widespread application of echocardiography with identification of a patent foramen ovale and/or an atrial septal aneurysm. The evaluation of the role of a patent foramen ovale in patients with a neurologic event is complex because the patent foramen ovale or atrial septal aneurysm may either be an innocent bystander or could be the etiologic mechanisms involved in the paradoxical embolus...
February 2004: Current Problems in Cardiology
P A Kaufmann, C Schirlo, V Pavlicek, T Berthold, C Burger, G K von Schulthess, E A Koller, A Buck
BACKGROUND: Although only poor data exist on changes in myocardial blood flow (MBF) under acute hypoxia, patients with known coronary artery disease are advised not to exceed a moderate altitude exposure of about 2000 m above sea level. METHODS AND RESULTS: We measured MBF with positron emission tomography using O-15--labeled water in 8 healthy human volunteers (aged 26 +/- 3 years [mean +/- SD]) at baseline (450 m above sea level, Zurich, Switzerland) and during acute hypoxic hypoxemia induced by inhalation of 2 hypoxic gas mixtures corresponding to altitudes of 2000 and 4500 m...
March 2001: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
A J Pikarsky, G Zamir, H Belzberg, P Crookes, A I Rivkind
Mallory-Weiss Syndrome (MWS) lesions account for up to 15 per cent of upper gastrointestinal bleeding episodes. Typically these lesions present as a consequence of vomiting that is often associated with alcoholism. Recently other conditions such as pregnancy, migraine, hiatal hernia, gastric ulcer, biliary disease, and various medications have been associated with MWS. We report on a 32-year-old male who developed a MSW lesion after a prolonged period of swimming followed by an extended commercial airplane flight...
November 2000: American Surgeon
G Weiler, M Risse
On February 8th 1988, a two-motor passenger aircraft of Metroliner type with 21 people on board entered a front of heavy weather at an altitude of 900 m and crashed after being struck by lightning which led to complete breakdown of the electrical systems on board. The site of the crash was in the marshy Ruhr meadows. The formation of the terrain enabled a subdivision into plan squares for rescue. The identification of the 21 bodies was carried out in the Essen Institute of Forensic Medicine in collaboration with the identification commission of the Federal Criminal Investigation Office...
1989: Beiträge Zur Gerichtlichen Medizin
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