Results 31 to 40 of about 184,374 (299)

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

Isoflavone Containing Legumes Mitigate Ergot Alkaloid-Induced Vasoconstriction in Goats (Capra hircus)

Animals, 2022
Ergot alkaloids produced by a fungal endophyte that infects tall fescue (Lolium arundinaceum; (E+ TF) can induce constriction of the vasculature in ruminants, resulting in “fescue toxicosis”.
Brittany E. Harlow, Michael D. Flythe, Jack P. Goodman, Huihua Ji, Glen E. Aiken   +4 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

Vascular responses of the extremities to transdermal application of vasoactive agents in Caucasian and African descent individuals [PDF]

, 2015
This is an accepted manuscript of an article published by Springer in European Journal of Applied Physiology on 04/04/2015, available online: https://doi.org/10.1007/s00421-015-3164-2 The accepted version of the publication may differ from the final ...
AC Shore, Army Medical surveillance activity, AT Koutsavlis, B Endrich, B Waeber, BJ Kim, C Cardillo, C Cardillo, CC Ungley, CC Ungley, Clare M. Eglin, CM Stein, CM Stein, CR Anderson, CS Thompson-Torgerson, D Bylund, D Miller, DA Rosenbaum, DF Kahn, DL Feairheller, DS Jones, DW DeGroot, E Clark, E Mata-Greenwood, FSC Golden, GA Conway, HA Daanen, HC Parkington, HP Rang, J Gainer, J Jia, J Jia, J Lundberg, James R. House, JE Burgess, JE Ramsay, JM Johnson, JP Noon, K Hope, K Komori, K Sauerstein, KK Griendling, KW Russell, L Ekenvall, L Kalinowski, LA Holowatz, LA Holowatz, M Honda, M Roustit, M Schmelz, M Shibasaki, MA Chotani, MA Chotani, MA Hashmi, Matthew J. Maley, ME Pueyo, Michael J. Tipton, MJ Easter, MJ Maley, MS Taylor, N Melikian, O Wilson, RF Furchgott, RG Hendry, RT Grant, RT Grant, SJ Duffy, SJ Morris, SJ Sarnoff, SR Bailey, T Lewis, TJ Cleophas, TM Mäkinen, WH Candler   +73 more
core   +4 more sources

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

Endothelin and the ischaemic heart [PDF]

, 2005
Soon after its identification as a powerful vasoconstrictor peptide, endothelin (ET-1) was implicated as a detrimental agent involved in determining the outcome of myocardial ischaemia and reperfusion.
Kane, K.A., McCabe, C., Wainwright, C.L.
core   +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

Relation between vibrotactile perception thresholds and reductions in finger blood flow induced by vibration of the hand at frequencies in the range 8–250 Hz

, 2014
Purpose: this study investigated how the vasoconstriction induced by vibration depends on the frequency of vibration when the vibration magnitude is defined by individual thresholds for perceiving vibration [i.e.
Griffin, Michael J., Ye, Ying
core   +1 more source