Flow Rate Profiler: an instrument to measure blood velocity profiles

Lombardi, R.; Danese, Giovanni; Leporati, Francesco

doi:10.1016/s0041-624x(00)00051-2

Cited by 8 publications

(9 citation statements)

References 19 publications

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“…Blood alcohol was also measured immediately after the study was completed. The haemodynamic study included the continuous monitoring of finger blood pressure (Finapres ; Ohmeda) and ECG, the dynamic measurement of the common carotid artery diameter (Echotracking technique ; Diamove Teltec, Lund, Sweden), the measurement of blood velocity, and the recording (every 5 ms) of the blood flow profile using an ultrasonographic multigated probe (Profilmeter FRP III) [20,21] at the same vascular sites.…”

Section: Methodsmentioning

confidence: 99%

“…The shear rate at the vessel wall was measured by analysing the blood flow profiles using an algorithm, as reported previously [20][21][22]. Briefly, using a 7.5 MHz multigated ultrasound probe, local blood velocities were measured simultaneously every 5 ms across the vessel transverse axis, in contiguous 0.2 mm sample volumes for the entire duration of the cardiac cycle.…”

Section: Methodsmentioning

confidence: 99%

“…The development of ultrasound technology has facilitated both the measurement of the mechanical properties of large artery walls [19] and the analysis of blood flow characteristics, particularly the measurement of shear stress at the carotid site [20]. Thus we were interested in determining whether any association could be found between the impairment of baroreflex heart rate control and changes in the mechanical properties of the arterial wall and shear stress of the carotid artery after administration of a small dose of alcohol, which reduces baroreflex heart rate control sensitivity [4], using these new ultrasound techniques in young healthy volunteers.…”

Section: Introductionmentioning

confidence: 99%

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Mechanics of the carotid artery wall and baroreflex sensitivity after acute ethanol administration in young healthy volunteers

FAZIO¹,

BARDELLI²,

MACALUSO³

et al. 2001

Clinical Science

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The effects of ethanol administered orally (300 mg/kg in 250 ml of water) or intravenously (7.5 mg.min(-1).kg(-1) in 250 ml of saline over 40 min) on common carotid haemodynamics, wall mechanics and baroreflex sensitivity were compared with the effects of the intravenous infusion of 250 ml of saline. Ethanol or saline was administered to 10 healthy volunteers after 30 min of supine rest, and measurements were obtained 40 min (median; range 34-46 min) after administration. After ethanol administration, the plasma alcohol level rose from 0 to 0.3+/-0.07 g/l. Mean arterial blood pressure had risen slightly at 20 min, but was normalized by 40 min, the time at which the haemodynamic study was performed. Heart rate decreased after infusion of either saline or alcohol, but was unchanged after oral ethanol administration. Both oral and intravenous ethanol administration were associated with significant decreases in baroreflex sensitivity, carotid shear stress and blood velocity, compared with resting values, while the mean carotid artery diameter was increased, and blood viscosity and mean blood flow were unchanged. No changes were observed in these parameters after saline administration. Ethanol, administered either intravenously or orally, increased the stiffness of the carotid artery and decreased the pulsatility (systo-diastolic changes) of its diameter. A direct, statistically significant correlation was found between the decrease in shear stress and the decrease in baroreflex heart rate control sensitivity after both modes of alcohol administration, while no such correlation was found between the increase in the Peterson elastic modulus and the decrease in carotid diameter pulsatility on the one hand or the decrease in baroreflex sensitivity on the other. In conclusion, reduced shear stress associated with vasodilatation of the carotid artery wall may contribute to the decrease in baroreflex sensitivity observed after acute ethanol administration.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanics of the carotid artery wall and baroreflex sensitivity after acute ethanol administration in young healthy volunteers

FAZIO¹,

BARDELLI²,

MACALUSO³

et al. 2001

Clinical Science

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“…Lombardi et al [11] and Hoeks et al [12] implemented two different systems, both capable of estimating the mean velocity on each sample volume. This approach is affected by the influence of the strong signal received from the wall motion (clutter), and needs the application of particular filtering techniques to reduce the estimation errors on the WSR calculation.…”

Section: Introductionmentioning

confidence: 99%

A novel ultrasound instrument for investigation of arterial mechanics

et al. 2004

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“…Taishi et al (23) measured successfully Reynolds shear stress in a pipe flow. Additionally, application of UVP to non-Newtonian and suspension flows are reported by Lombardi et al (24) , Ouriev and Windhab (25) , Fyrippi et al (26) , and Xu and Aidun (27) .…”

Section: Introductionmentioning

confidence: 86%

Turbulent Bubbly Channel Flow Investigated by Ultrasound Velocity Profiler

Murai

Fujii

Tasaka

et al. 2006

JFST

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Ultrasound velocity profiler (UVP) is applied to measurements of a horizontal turbulent bubbly channel flow to ascertain the mechanism of bubble-induced frictional drag reduction. Typical parameter regimes of the target flow are Re number of 0.6-6.0 x10 4 , void fraction of 0-3%, and bubble diameter of 10-50mm.Since the UVP system only outputs velocity profiles on an ultrasound beam inside a liquid phase, a signal processing method for raw velocity data is proposed and used to detect the bubble interface. A conditional averaged liquid phase velocity profile that excludes gas phase data, has shown for the first time the structure of a turbulent boundary layer altered by large buoyant bubbles sliding along the channel wall.

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Flow Rate Profiler: an instrument to measure blood velocity profiles

Cited by 8 publications

References 19 publications

Mechanics of the carotid artery wall and baroreflex sensitivity after acute ethanol administration in young healthy volunteers

Mechanics of the carotid artery wall and baroreflex sensitivity after acute ethanol administration in young healthy volunteers

A novel ultrasound instrument for investigation of arterial mechanics

Turbulent Bubbly Channel Flow Investigated by Ultrasound Velocity Profiler

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