Results 21 to 30 of about 115,625 (290)

Mechanisms of Vasovagal Syncope in the Young: Reduced Systemic Vascular Resistance Versus Reduced Cardiac Output

Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease, 2017
BackgroundSyncope is a sudden transient loss of consciousness and postural tone caused by cerebral hypoperfusion. The most common form is vasovagal syncope (VVS).
Julian M. Stewart, Marvin S. Medow, Richard Sutton, Paul Visintainer, David L. Jardine, Wouter Wieling   +5 more
doaj   +1 more source

Mechanisms of tilt‐induced vasovagal syncope in healthy volunteers and postural tachycardia syndrome patients without past history of syncope

Physiological Reports, 2019
Upright tilt table testing has been used to test for vasovagal syncope (VVS) but can result in “false positives” in which tilt‐induced fainting (tilt+) occurs in the absence of real‐world fainting.
Julian M. Stewart, Mohamed A. Shaban, Tyler Fialkoff, Brianna Tuma‐Marcella, Paul Visintainer, Courtney Terilli, Marvin S. Medow   +6 more
doaj   +1 more source

Arterial Responses in Periparturient Beef Cows Following a 9-Week Exposure to Ergot (Claviceps purpurea) in Feed

Frontiers in Veterinary Science, 2019
Ergot alkaloids are vasoconstrictors frequently detected in low concentrations in livestock feed. The Canadian Food Inspection Agency permits up to 3,000 μg ergot alkaloids per kg cattle feed.
Vanessa Cowan, Vanessa Cowan, Taylor Grusie, John McKinnon, Barry Blakley, Barry Blakley, Jaswant Singh   +6 more
doaj   +1 more source

Post-exercise Body Cooling: Skin Blood Flow, Venous Pooling, and Orthostatic Intolerance

Frontiers in Sports and Active Living, 2021
Athletes and certain occupations (e.g., military, firefighters) must navigate unique heat challenges as they perform physical tasks during prolonged heat stress, at times while wearing protective clothing that hinders heat dissipation.
Afton D. Seeley, Afton D. Seeley, Gabrielle E. W. Giersch, Gabrielle E. W. Giersch, Nisha Charkoudian   +4 more
doaj   +1 more source

Vasoconstriction and hyperperfusion syndrome after carotid artery stenting

The Egyptian Journal of Neurology, Psychiatry and Neurosurgery, 2022
Background Common complications of carotid artery stenting (CAS) are cerebral ischemia and hyperperfusion syndrome. To date, only a few cases of late-onset cerebral vasoconstriction occurring several hours after CAS have been reported. However, there are
Yuya Kobayashi, Teruya Morizumi, Gaku Okumura, Kiyoshiro Nagamatsu, Yusaku Shimizu, Tetsuo Sasaki, Atsushi Sato   +6 more
doaj   +1 more source

The pressure field model: a challenge to the conventional Starling and Guyton model of hemodynamic management

Frontiers in Anesthesiology
IntroductionEnsuring hemodynamic stability with adequate perfusion to vital organs is critical to the safe conduct of anesthesia. Recent advances in hemodynamic monitoring technologies allow pressure, flow, and resistance to be measured continuously ...
Stephen F. Woodford, Stephen F. Woodford, Laurence Weinberg, Laurence Weinberg, Lachlan F. Miles, Lachlan F. Miles, Ruth C. Marshall, Bernhard Riedel, Bernhard Riedel, Philip J. Peyton, Philip J. Peyton   +10 more
doaj   +1 more source

Cardiovascular and Thermal Responses to Cold Exposure During Exercise in Iron-Deficient Anemic Individuals

Journal of Functional Morphology and Kinesiology
Background: Temperature regulation is impaired in iron-deficient anemic humans and rats at rest during cold exposure. However, there is a paucity of data regarding the interplay of cold exposure, anemia, and exercise on thermal and cardiovascular ...
Panagiotis Miliotis, Spyridoula Ntalapera, Panagiotis Lakeas, Argyris Toubekis, Nickos Geladas, Maria Koskolou   +5 more
doaj   +1 more source

Vasoconstriction Response to Mental Stress in Sickle Cell Disease: The Role of the Cardiac and Vascular Baroreflexes

Frontiers in Physiology, 2021
Recent studies have shown that individuals with sickle cell disease (SCD) exhibit greater vasoconstriction responses to physical autonomic stressors, such as heat pain and cold pain than normal individuals, but this is not the case for mental stress (MTS)
Wanwara Thuptimdang, Payal Shah, Maha Khaleel, John Sunwoo, Saranya Veluswamy, Roberta M. Kato, Thomas D. Coates, Michael C. K. Khoo   +7 more
doaj   +1 more source

Mechanisms of electrical vasoconstriction [PDF]

Journal of NeuroEngineering and Rehabilitation, 2018
Electrical vasoconstriction is a promising approach to control blood pressure or restrict bleeding in non-compressible wounds. We explore the neural and non-neural pathways of electrical vasoconstriction in-vivo.Charge-balanced, asymmetric pulses were delivered through a pair of metal disc electrodes.
Mark Brinton, Yossi Mandel, Ira Schachar, Daniel Palanker   +3 more
openaire   +3 more sources

Vascular Contributions to Migraine: Time to Revisit?

Frontiers in Cellular Neuroscience, 2018
Migraine is one of the most prevalent and disabling neurovascular disorders worldwide. However, despite the increase in awareness and research, the understanding of migraine pathophysiology and treatment options remain limited.
Bianca N. Mason, Andrew F. Russo, Andrew F. Russo, Andrew F. Russo   +3 more
doaj   +1 more source