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Key Structural Features of Microvascular Networks Leading to the Formation of Multiple Equilibria.
Bull Math Biol
January 2025
Wolfson Centre for Mathematical Biology, Mathematical Institute, University of Oxford, Woodstock Rd, Oxford, Oxfordshire, OX2 6GG, UK.
We analyse mathematical models of blood flow in two simple vascular networks in order to identify structural features that lead to the formation of multiple equilibria. Our models are based on existing rules for blood rheology and haematocrit splitting. By performing bifurcation analysis on these simple network flow models, we identify a link between the changing flow direction in key vessels and the existence of multiple equilibria.
View Article and Find Full Text PDFCardiovascular Performance in Neonates with Hypoxic-Ischemic Encephalopathy Under Therapeutic Hypothermia: Evaluation by Conventional and Advanced Echocardiographic Techniques.
Pediatr Cardiol
January 2025
Echocardiography Laboratory, Instituto Dante Pazzanese de Cardiologia, São Paulo, Brazil.
This study aimed to evaluate the hemodynamic and ventricular performance of neonates with hypoxic-ischemic encephalopathy (HIE) undergoing therapeutic hypothermia using conventional and advanced echocardiographic techniques. This observational, prospective study included 22 neonates with HIE matched with 22 healthy neonates. Echocardiographic studies were performed 24 h after achieving target temperature during hypothermia and 24 h after rewarming.
View Article and Find Full Text PDFCardiovascular Reactivity to Mental Stress and Adverse Cardiovascular Outcomes in Patients With Coronary Artery Disease.
J Am Heart Assoc
January 2025
Department of Medicine, Division of Cardiology Emory University School of Medicine Atlanta GA USA.
Background: Acute psychological stress may induce physiological changes predisposing individuals to adverse health outcomes through hemodynamic and vascular effects. We studied the association between the aggregated stress-induced changes in hemodynamic and vascular function tests with adverse cardiovascular outcomes in patients with coronary artery disease, after adjusting for sociodemographic and clinical factors.
Methods And Results: Individuals with stable coronary artery disease from 2 prospective cohort studies were studied.
Correlation of zero echo time functional MRI with neuronal activity in rats.
J Cereb Blood Flow Metab
January 2025
A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland.
Zero echo time (zero-TE) pulse sequences provide a quiet and artifact-free alternative to conventional functional magnetic resonance imaging (fMRI) pulse sequences. The fast readouts (<1 ms) utilized in zero-TE fMRI produce an image contrast with negligible contributions from blood oxygenation level-dependent (BOLD) mechanisms, yet the zero-TE contrast is highly sensitive to brain function. However, the precise relationship between the zero-TE contrast and neuronal activity has not been determined.
View Article and Find Full Text PDFDecreased prefrontal activation during verbal fluency task after repetitive transcranial magnetic stimulation treatment for depression in Alzheimer's disease: a functional near-infrared spectroscopy study.
Front Aging Neurosci
January 2025
Department of Psychiatry, Affiliated Kangning Hospital of Ningbo University, Ningbo, China.
Background: Studies have shown the clinical effects of repetitive transcranial magnetic stimulation (rTMS) on depression in Alzheimer's disease (AD). However, the underlying mechanisms remain poorly understood. The measurement of brain activation links neurobiological and functional aspects but is challenging in patients with dementia.
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