scholarly journals Gender Differences on the Effect of Non-HDL-C on Blood Pressure, Blood Flow Velocities and Arterial Wall Thickness; An Observational Analysis in Madurai Population

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
John Rajpathy ◽  
M. Mariappan ◽  
J. Vijay Anto
Keyword(s):  
Blood Pressure ◽  
Gender Differences ◽  
Blood Flow ◽  
Wall Thickness ◽  
Arterial Wall ◽  
Observational Analysis ◽  
Arterial Wall Thickness ◽  
Blood Flow Velocities ◽  
Flow Velocities

Patterns of Cerebral Blood Flow and Systemic Hemodynamics During Arithmetic Processing

2008 ◽  
Vol 22 (2) ◽  
pp. 81-90 ◽  
Author(s):  
Natalie Werner ◽  
Neval Kapan ◽  
Gustavo A. Reyes del Paso
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Time Course ◽  
Doppler Sonography ◽  
Transcranial Doppler Sonography ◽  
Systemic Hemodynamics ◽  
Heart Period ◽  
Blood Flow Velocities ◽  
Flow Velocities

The present study explored modulations in cerebral blood flow and systemic hemodynamics during the execution of a mental calculation task in 41 healthy subjects. Time course and lateralization of blood flow velocities in the medial cerebral arteries of both hemispheres were assessed using functional transcranial Doppler sonography. Indices of systemic hemodynamics were obtained using continuous blood pressure recordings. Doppler sonography revealed a biphasic left dominant rise in cerebral blood flow velocities during task execution. Systemic blood pressure increased, whereas heart period, heart period variability, and baroreflex sensitivity declined. Blood pressure and heart period proved predictive of the magnitude of the cerebral blood flow response, particularly of its initial component. Various physiological mechanisms may be assumed to be involved in cardiovascular adjustment to cognitive demands. While specific contributions of the sympathetic and parasympathetic systems may account for the observed pattern of systemic hemodynamics, flow metabolism coupling, fast neurogenic vasodilation, and cerebral autoregulation may be involved in mediating cerebral blood flow modulations. Furthermore, during conditions of high cardiovascular reactivity, systemic hemodynamic changes exert a marked influence on cerebral blood perfusion.

Gender Differences in Blood Flow Velocities after Carotid Angioplasty and Stenting

2007 ◽  
Vol 21 (5) ◽  
pp. 576-579 ◽  
Author(s):  
Carlos H. Timaran ◽  
George L. Berdejo ◽  
Takao Ohki ◽  
David E. Timaran ◽  
Frank J. Veith ◽  
...  
Keyword(s):  
Gender Differences ◽  
Blood Flow ◽  
Carotid Angioplasty ◽  
Blood Flow Velocities ◽  
Angioplasty And Stenting ◽  
Carotid Angioplasty And Stenting ◽  
Flow Velocities

Exercise and arterial adaptation in humans: uncoupling localized and systemic effects

2011 ◽  
Vol 110 (5) ◽  
pp. 1190-1195 ◽  
Author(s):  
Nicola J. Rowley ◽  
Ellen A. Dawson ◽  
Gurpreet K. Birk ◽  
N. Timothy Cable ◽  
Keith George ◽  
...  
Keyword(s):  
Blood Flow ◽  
Wall Thickness ◽  
Arterial Wall ◽  
Duplex Ultrasound ◽  
Arterial Wall Thickness ◽  
Control Subjects ◽  
Systemic Factors ◽  
Ischemic Handgrip Exercise ◽  
And Function ◽  
Peak Blood

Previous studies have established effects of exercise training on arterial wall thickness, remodeling, and function in humans, but the extent to which these changes are locally or systemically mediated is unclear. We examined the brachial arteries of the dominant (D) and nondominant (ND) upper limbs of elite racquet sportsmen and compared them to those of matched healthy inactive controls. Carotid and superficial femoral artery responses were also assessed in both groups. High-resolution duplex ultrasound was used to examine resting diameter, wall thickness, peak diameter, and blood flow. We found larger resting arterial diameter in the preferred arm of the athletes (4.9 ± 0.5 mm) relative to their nonpreferred arm (4.3 ± 0.4 mm, P < 0.05) and both arms of control subjects (D: 4.1 ± 0.4 mm; ND: 4.0 ± 0.4, P < 0.05). Similar limb-specific differences were also evident in brachial artery dilator capacity (5.5 ± 0.5 vs. 4.8 ± 0.4, 4.8 ± 0.6, and 4.8 ± 0.6 mm, respectively; P < 0.05) following glyceryl trinitrate administration and peak blood flow (1,118 ± 326 vs. 732 ± 320, 737 ± 219, and 698 ± 174 ml/min, respectively; P < 0.05) following ischemic handgrip exercise. In contrast, athletes demonstrated consistently lower wall thickness in carotid (509 ± 55 μm), brachial (D: 239 ± 100 μm; ND: 234 ± 133 μm), and femoral (D: 479 ± 38 μm; ND: 479 ± 42 μm) arteries compared with control subjects (carotid: 618 ± 74 μm; brachial D: 516 ± 100 μm; ND: 539 ± 129 μm; femoral D: 634 ± 155 μm; ND: 589 ± 112 μm; all P < 0.05 vs. athletes), with no differences between the limbs of either group. These data suggest that localized effects of exercise are evident in the remodeling of arterial size, whereas arterial wall thickness appears to be affected by systemic factors.

Color Doppler Imaging and Ocular Pulse Amplitude in Glaucomatous and Healthy Eyes

2009 ◽  
Vol 19 (4) ◽  
pp. 580-587 ◽  
Author(s):  
Ingeborg Stalmans ◽  
Alon Harris ◽  
Steffen Fieuws ◽  
Thierry Zeyen ◽  
Veerle Vanbellinghen ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Corneal Thickness ◽  
Healthy Controls ◽  
Open Angle ◽  
Blood Flow Velocities ◽  
Retrobulbar Vessels ◽  
Flow Velocities

Purpose To determine factors influencing color Doppler imaging (CDI) measurements, to compare retrobulbar flow velocities between patients with glaucoma and healthy controls, and to describe the correlation between CDI and ocular pulse amplitude (OPA). Methods Patients with normal tension (n=28) or primary open angle glaucoma (n=19) and healthy controls (n=22) underwent CDI and OPA measurements. Intraocular pressure, corneal thickness, blood pressure, and heart rate were also measured. Spearman correlations were used to explore relations among these variables. A regression model for repeated measures was applied to compare between diagnostic groups the flow velocity indices in the retrobulbar vessels. Results Retrobulbar diastolic blood flow velocities correlated with diastolic blood pressure and perfusion pressure (range of Spearman rho [ρ] coefficients=0.25–0.28; P=0.044–0.013 for the different vessels). Corneal thickness showed a positive correlation with systolic and diastolic flow velocities in the central retinal artery (ρ=0.29 and 0.31; P=0.017 and 0.011 for peak systolic and end diastolic velocity, respectively). Systolic and diastolic blood flow velocities were reduced in the retrobulbar vessels of patients with normal tension glaucoma (P=0.0004) as well as primary open angle glaucoma (P=0.003) compared to healthy controls. A correlation was found between OPA and the resistive index in the retrobulbar vessels of the healthy controls (range ρ=0.42–0.53; P=0.059–0.014). Conclusions Retrobulbar blood flow velocities are reduced in patients with primary open angle glaucoma and normal tension glaucoma. Blood pressure and corneal thickness may influence CDI measurements. OPA correlates with the resistive index in CDI.

Whole blood viscosity and cerebral blood flow velocities in obese hypertensive or obese normotensive adolescents

2018 ◽  
Vol 31 (3) ◽  
pp. 275-281 ◽  
Author(s):  
Meltem Akcaboy ◽  
Bijen Nazliel ◽  
Tayfun Goktas ◽  
Serdar Kula ◽  
Bülent Celik ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Cerebral Artery ◽  
Blood Viscosity ◽  
Whole Blood ◽  
Artery Blood Flow ◽  
Whole Blood Viscosity ◽  
Blood Flow Velocities ◽  
Flow Velocities

AbstractBackground:Obesity affects all major organ systems and leads to increased morbidity and mortality. Whole blood viscosity is an important independent regulator of cerebral blood flow. The aim of the present study was to evaluate the effect of whole blood viscosity on cerebral artery blood flow velocities using transcranial Doppler ultrasound in pediatric patients with obesity compared to healthy controls and analyze the effect of whole blood viscosity and blood pressure status to the cerebral artery blood flow velocities.Methods:Sixty patients with obesity diagnosed according to their body mass index (BMI) percentiles aged 13–18 years old were prospectively enrolled. They were grouped as hypertensive or normotensive according to their ambulatory blood pressure monitoring. Whole blood viscosity and middle cerebral artery velocities by transcranial Doppler ultrasound were studied and compared to 20 healthy same aged controls.Results:Whole blood viscosity values in hypertensive (0.0619±0.0077 poise) and normotensive (0.0607±0.0071 poise) groups were higher than controls (0.0616±0.0064 poise), with no significance. Middle cerebral artery blood flow velocities were higher in the obese hypertensive (73.9±15.0 cm/s) and obese normotensive groups (75.2±13.5 cm/s) than controls (66.4±11.5 cm/s), but with no statistical significance.Conclusions:Physiological changes in blood viscosity and changes in blood pressure did not seem to have any direct effect on cerebral blood flow velocities, the reason might be that the cerebral circulation is capable of adaptively modulating itself to changes to maintain a uniform cerebral blood flow.

scholarly journals Surfactant Bolus Instillation: Effects of Different Doses on Blood Pressure and Cerebral Blood Flow Velocities

Neonatology ◽  
1994 ◽  
Vol 66 (1) ◽  
pp. 16-21 ◽  
Author(s):  
Martin Rey ◽  
Hugo Segerer ◽  
Christiane Kiessling ◽  
Michael Obladen
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Blood Flow Velocities ◽  
Different Doses ◽  
Flow Velocities
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