Results 31 to 40 of about 17,476 (253)

Intracranial and Intraocular Pressure During Various Degrees of Head-Down Tilt [PDF]

Aerospace Medicine and Human Performance, 2017
BACKGROUND: More than half of astronauts develop ophthalmic changes during long-duration spaceflight consistent with an abnormal intraocular and intracranial pressure (IOP, ICP) difference. The aim of our study was to assess IOP and ICP during head-down tilt (HDT) and the additive or attenuating effects of 1% CO2 and lower body negative pressure (LBNP)
Marshall-Goebel, Karina, Mulder, Edwin, Bershad, Eric, Laing, Charles, Eklund, Anders, Malm, Jan, Stern, Claudia, Rittweger, Jörn   +7 more
openaire   +3 more sources

Modelling physiology of haemodynamic adaptation in short-term microgravity exposure and orthostatic stress on Earth

Scientific Reports, 2021
Cardiovascular haemodynamics alters during posture changes and exposure to microgravity. Vascular auto-remodelling observed in subjects living in space environment causes them orthostatic intolerance when they return on Earth.
Parvin Mohammadyari, Giacomo Gadda, Angelo Taibi   +2 more
doaj   +1 more source

Cardiovascular Response to Posture Changes: Multiscale Modeling and in vivo Validation During Head-Up Tilt

Frontiers in Physiology, 2022
In spite of cardiovascular system (CVS) response to posture changes have been widely studied, a number of mechanisms and their interplay in regulating central blood pressure and organs perfusion upon orthostatic stress are not yet clear.
Matteo Fois, Simona Vittoria Maule, Marta Giudici, Matteo Valente, Luca Ridolfi, Stefania Scarsoglio   +5 more
doaj   +1 more source

Ischemia modified albumin: does it change during pneumoperitoneum in robotic prostatectomies?

International Brazilian Journal of Urology, 2016
Background The unique positioning of the patient at steep Trendelenburg with prolonged and increased intra-abdominal pressure (IAP) during robotic radical prostatectomy may increase the risk of splanchnic ischemia.
Serpil Ustalar Ozgen, Bora Ozveren, Meltem Kilercik, Ugur Aksu, Binnaz Ay, Ilter Tufek, Ali Riza Kural, Levent N.Turkeri, Fevzi Toraman   +8 more
doaj   +1 more source

Ground-Based Analogs for Human Spaceflight

Frontiers in Physiology, 2020
This mini-review provides an updated summary of various analogs for adaptations of humans to the microgravity of space. Microgravity analogs discussed in this paper include dry immersion, wet immersion, unilateral lower-extremity limb suspension, head ...
Meenakshi Pandiarajan, Alan R. Hargens
doaj   +1 more source

Head-down tilt position successfully prevent severe brain air embolism

SAGE Open Medical Case Reports, 2018
Air embolisms are rare life-threatening complications that develop under various conditions, including surgery. During segmentectomy for thoracic surgery, air is blown into the selected bronchus for segment margin detection.
Gaku Yamaguchi, Hiroyuki Miura, Eiji Nakajima, Norihiko Ikeda   +3 more
doaj   +1 more source

Effect of Head-Up/-Down Tilt on ECG Segments and Myocardial Temporal Dispersion in Healthy Subjects

Biology, 2023
The head-up/-down tilt test acutely modifies the autonomic nervous system balance throughout a deactivation of the cardiopulmonary reflexes. The present study examines the influence of head-up/-down tilt on a number of ECG segments. A total of 20 healthy
Gianfranco Piccirillo, Federica Moscucci, Ilaria Di Diego, Martina Mezzadri, Cristina Caltabiano, Myriam Carnovale, Andrea Corrao, Ilaria Lospinuso, Sara Stefano, Claudia Scinicariello, Marco Giuffrè, Valerio De Santis, Susanna Sciomer, Pietro Rossi, Emiliano Fiori, Damiano Magrì   +15 more
doaj   +1 more source

Self-Organization of Blood Pressure Regulation: Experimental Evidence

Frontiers in Physiology, 2016
Blood pressure regulation is a prime example of homeostatic regulation. However, some characteristics of the cardiovascular system better match a non-linear self-organized system than a homeostatic one.
Jacques-Olivier eFortrat, Thibaud eLevrard, sandrine ecourcinous, jacques evictor   +3 more
doaj   +1 more source

Impact of Daily Lower‐Body Negative Pressure or Cycling Followed by Venous Constrictive Thigh Cuffs on Bedrest‐Induced Orthostatic Intolerance

Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease
Background Orthostatic intolerance occurs following immobilization in patients on Earth and in astronauts after spaceflight. Head‐down tilt bedrest is a terrestrial model for weightlessness and induces orthostatic intolerance.
Jan‐Niklas Hönemann, Fabian Hoffmann, Laura de Boni, Peter Gauger, Edwin Mulder, Stefan Möstl, Karsten Heusser, Marie‐Therese Schmitz, Marcel Halbach, Steven S. Laurie, Stuart M. C. Lee, Brandon R. Macias, Jens Jordan, Jens Tank   +13 more
doaj   +1 more source

Cardiopulmonary Responses to Sub-Maximal Ergometer Exercise in a Hypo-Gravity Analog Using Head-Down Tilt and Head-Up Tilt

Frontiers in Physiology, 2019
After more than 50 years of spaceflight, we still do not know what is the appropriate range of gravity levels that are required to maintain normal physiological function in humans. This research effort aimed to investigate musculoskeletal, cardiovascular,
Ana Diaz-Artiles, Patricia Navarro Tichell, Francisca Perez   +2 more
doaj   +1 more source