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Background: A coronary function test (CFT) is the recommended diagnostic test to identify coronary vasomotor dysfunction as a cause of symptoms in patients with angina and nonobstructive coronary arteries (ANOCA). Acetylcholine is the commonly used pharmacological agent for spasm provocation. We aimed to investigate an association between severity of symptoms and provocative acetylcholine dose.
View Article and Find Full Text PDFIschemia during exercise stress testing, an indication of coronary vasomotor dysfunction?
Int J Cardiol Heart Vasc
February 2025
Department of Cardiology, Radboud University Medical Center, Nijmegen, the Netherlands.
Background: Recently it has been suggested that coronary microvascular dysfunction (CMD) may explain the high false-positive rate of exercise electrocardiographic stress testing (EST). However, patients with angina but non-obstructive coronary artery disease (ANOCA) present with a broader spectrum of coronary vasomotor dysfunction (CVDys), namely coronary artery spasm (CAS), CMD or a combination of both. We aim to investigate the diagnostic value of EST for the entire CVDys spectrum.
View Article and Find Full Text PDFEffects of Hydrogen Sulfide at Normal Body Temperature and in the Cold on Isolated Tail and Carotid Arteries from Rats and TRPA1 Knockout and Wild-Type Mice.
Biomedicines
December 2024
Department of Thermophysiology, Institute for Translational Medicine, Medical School, University of Pecs, 7624 Pecs, Hungary.
Hydrogen sulfide (HS) is a gasotransmitter that modulates vascular tone, causing either vasodilation or vasoconstriction depending on the vascular bed, species, and experimental conditions. The cold-sensitive transient receptor potential ankyrin-1 (TRPA1) channel mediates HS-induced effects; however, its contribution to the vasomotor responses of different arteries at different temperatures has remained unclear. Here, we aimed to fill this gap by comparing the effects of sodium sulfide (NaS), which is a fast-releasing HS donor, on the isolated carotid and tail skin arteries of rats and mice at cold and normal body temperature with wire myography.
View Article and Find Full Text PDFNon-invasive point-of-care optical technique for continuous in vivo assessment of microcirculatory function: Application to a preclinical model of early sepsis.
FASEB J
December 2024
Department of Medical Biophysics, Western University, London, Ontario, Canada.
Increased amplitude of peripheral vasomotion is a potential early marker of sepsis-related microcirculatory impairment; however, previous reports relied on clinically unsuitable invasive techniques. Hyperspectral near-infrared spectroscopy (hsNIRS) and diffuse correlation spectroscopy (DCS) are non-invasive, bedside techniques that can be paired to continuously monitor tissue hemoglobin content (HbT), oxygenation (StO), and perfusion (rBF) to detect vasomotion as low-frequency microhemodynamic oscillations. While previous studies have primarily focused on the peripheral microcirculation, cerebral injury is also a common occurrence in sepsis and hsNIRS-DCS could be used to assess cerebral microcirculatory function.
View Article and Find Full Text PDFThe gamma rhythm as a guardian of brain health.
Elife
November 2024
Transylvanian Institute of Neuroscience, Department of Experimental and Theoretical Neuroscience, Cluj-Napoca, Romania.
Gamma oscillations in brain activity (30-150 Hz) have been studied for over 80 years. Although in the past three decades significant progress has been made to try to understand their functional role, a definitive answer regarding their causal implication in perception, cognition, and behavior still lies ahead of us. Here, we first review the basic neural mechanisms that give rise to gamma oscillations and then focus on two main pillars of exploration.
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