Results 61 to 70 of about 10,602 (234)

Hypoxia, Hypocapnia and Spirometry at Altitude

Clinical Science, 1997
1. Both hypoxia and hypocapnia can cause broncho-constriction in humans, and this could have a bearing on performance at high altitude or contribute to altitude sickness. We studied the relationship between spirometry, arterial oxygen saturation and end-tidal carbon dioxide (ETCO2) concentration in a group of healthy lowland adults during a stay at ...
Pollard, A, Barry, P, Mason, N, Collier, D, Pollard, R, Pollard, P, Martin, I, Fraser, R, Miller, MR, Milledge, J   +9 more
openaire   +3 more sources

Hypocapnia and Cerebral Hypoperfusion in Orthostatic Intolerance [PDF]

Stroke, 1998
Background and Purpose —Orthostatic and other stresses trigger tachycardia associated with symptoms of tremulousness, shortness of breath, dizziness, blurred vision, and, often, syncope. It has been suggested that paradoxical cerebral vasoconstriction during head-up tilt might be present in patients with orthostatic intolerance.
V, Novak, J M, Spies, P, Novak, B R, McPhee, T A, Rummans, P A, Low   +5 more
openaire   +2 more sources

Treatment of Cheyne-Stokes respiration in patients with congestive heart failure [PDF]

, 2007
Universidade Federal de São Paulo (UNIFESP), Escola Paulista de Medicina (EPM)UNIFESP ...
Freitas, Ivan Guerra de Araújo, Togeiro, Sonia Maria, Tufik, Sergio   +2 more
core   +2 more sources

Whole‐body hot water immersion effect on cerebral haemodynamics and subsequent cerebrovascular reactivity to carbon dioxide

Experimental Physiology, EarlyView.
Abstract To test the hypothesis that hot water immersion (HWI) improves cerebrovascular function via shear‐mediated mechanisms, this study determined cerebrovascular reactivity to carbon dioxide (CVRCO2${\mathrm{CV}}{{\mathrm{R}}_{{\mathrm{C}}{{\mathrm{O}}_2}}}$) before and after 60 min of 39°C HWI and a 21°C air control (CON) in 15 healthy ...
Samuel F. Leaney, Ester Tommasini, Guto W. Hughes, Alison M. Shepherd, Nyah D. Kingdon, Justin S. Lawley, Geoff B. Coombs, Jonathan P. Moore, Samuel J. Oliver   +8 more
wiley   +1 more source

A comparison of normobaric and hypobaric hypoxia effects on cerebrovascular response pre and post maximal exercise

Experimental Physiology, EarlyView.
Abstract A lack of consensus remains on whether normobaric hypoxia (NH) and hypobaric hypoxia (HH) may differentially impact physiological factors affecting cerebrovascular regulation, particularly with an additional strenuous exercise component. We sought to compare the acute effects of NH and HH on global cerebral blood flow (gCBF) at an altitude ...
Rachel Turner, Giovanni Vinetti, Giacomo Strapazzon, Hannes Gatterer   +3 more
wiley   +1 more source

Sustained moderate reductions in arterial CO2 after brain trauma Time-course of cerebral blood flow velocity and intracranial pressure [PDF]

, 2018
Objective: In healthy volunteers cerebral blood flow starts to recover towards baseline within a few minutes of continued hyperventilation due to normalisation of perivascular pH.
Balestreri, Marcella, Chatfield, Doris, Coles, Jonathan, Czosnyka, Marek, Johnston, Andrew, Menon, David, Pickard, John, Smielewski, Peter, Steiner, Luzius   +8 more
core  

Influence of facial cooling on carotid body tonic activity and sensitivity

Experimental Physiology, EarlyView.
Abstract Facial cooling can increase ventilation and augment the hypoxic ventilatory response. Whole body cooling increases both carotid body tonic activity and sensitivity; however, whether isolated facial cooling induces similar carotid body hyperexcitability was unknown.
Robyn Morley, Liam D. Corr, Elliott J. Jenkins, Joseph A. Killick, Travis D. Gibbons, Joshua C. Tremblay   +5 more
wiley   +1 more source

End-Tidal Hypocapnia Under Anesthesia Predicts Postoperative Delirium

Frontiers in Neurology, 2018
Background: Postoperative delirium (POD) might be associated with anesthetic management, but research has focused on choice or dosage of anesthetic drugs. We examined potential contributions of intraoperative ventilatory and hemodynamic management to POD.
W. Alan C. Mutch, W. Alan C. Mutch, Renée El-Gabalawy, Renée El-Gabalawy, Linda Girling, Kayla Kilborn, Eric Jacobsohn   +6 more
doaj   +1 more source

Randomized crossover comparison of proportional assist ventilation and patient-triggered ventilation in extremely low birth weight infants with evolving chronic lung disease [PDF]

, 2007
Background: Refinement of ventilatory techniques remains a challenge given the persistence of chronic lung disease of preterm infants. Objective: To test the hypothesis that proportional assist ventilation ( PAV) will allow to lower the ventilator ...
Andreas Schulze, Eduardo Bancalari, Esther Rieger-Fackeldey, Lebowitz HH, Musante G, Nelson Claure, Poon CS, Poon CS, Ruth Everett, Schaller P, Schulze A, Schulze A, Schulze A, Schulze A, Schulze A, Schulze A, Tilo Gerhardt, Younes M   +17 more
core   +1 more source

Sex differences in the prefrontal cortex and muscle oxygenation during exercise until exhaustion in endurance‐trained individuals

Experimental Physiology, EarlyView.
Abstract figure legend During cardiopulmonary exercise testing, the decline in oxygenation in the prefrontal cortex of women is striking. This crucial brain area is directly involved in planning motor tasks. The decline is particularly pronounced at higher exercise intensities, especially after reaching the respiratory compensation point or anaerobic ...
Daniel Ramos‐López, Raúl Caulier‐Cisterna, Benjamín Díaz‐Ortiz, Cristóbal Baumann‐Biancani, Kamilo Hunger‐Abbott, Matías Herrera‐Matas, Andrés Vega‐Moraga, Vitor A. Lira, Maximiliano Espinosa‐Ramírez, Karol Ramírez‐Parada, Luigi Gabrielli‐Nervi, Hugo E. Verdejo, Felipe Contreras‐Briceño   +12 more
wiley   +1 more source