Velocity distribution along an elastic model of human arterial tree

Rieu, Régis; Friggi, A; Pelissier, R.

doi:10.1016/0021-9290(85)90025-9

Cited by 30 publications

(15 citation statements)

References 26 publications

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“…To date, no studies have examined the regional two‐dimensional (cross‐sectional area) flow profiles of the normal Ao in children. Previous studies were performed in one or two dimensions in in‐vitro models (15, 17), in adults (1–7, 9, 10) and animals (6, 8, 14, 18, 26, 33). These studies showed an axisymmetric flow as well as a skewed profile, although it is likely that there were differences between individuals and between humans and animals.…”

Section: Discussionmentioning

confidence: 99%

“…THE MECHANICS OF BLOOD FLOW in the normal aorta (Ao) has been the subject of much investigation for many years (1–10). Many different techniques have been used to study such parameters as regional flow and velocity, pulse wave propagation (11), and wave reflection (12, 13), to name a few.…”

mentioning

confidence: 99%

“…There is a complex configuration of flow in the Ao, with both primary and secondary flow patterns (4, 14–17), and there is disagreement in the literature as to the shape of the velocity profile. Although some investigators have found that flow in the normal ascending (AAo) and descending (DAo) aortas is generally axisymmetric across the vessel diameter (6, 18), numerous studies have demonstrated that velocity profiles are axially skewed (1, 5, 7, 19).…”

mentioning

confidence: 99%

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The impact of patient and professional diagnostic delays on survival in pharyngeal cancer

Koivunen

Rantala

Hyrynkangas

et al. 2001

Cancer

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Precisely size‐selected protonated water clusters H+(H2O)n (n=20–200) were studied by IR spectroscopy to provide insights into the structures of large‐scale H‐bonded water networks. The spectral features reveal that cluster structures gradually approach that of the bulk‐water network and involve a greater number of four‐coordinate water molecules with increasing cluster size (see picture).

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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The impact of patient and professional diagnostic delays on survival in pharyngeal cancer

Koivunen

Rantala

Hyrynkangas

et al. 2001

Cancer

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“…Therefore, some a prior knowledge of the velocity field studied is essential. Rieu et al [23] reported that the radial velocity components in the human arterial tree are small compared to the axial components, and Nygaard et al [20] reported axial velocities almost identical when comparing the PDU and the HFA technique in vivo, apart from retrograde velocities in the ascending and descending aorta. We therefore assumed the blood flow in the ascending aorta to be mainly axial, and considered the error of the axial velocity estimates minor.…”

Section: Discussionmentioning

confidence: 99%

Velocity profiles in the ascending aorta in pigs: Axial development and influence of changes in left ventricular contraction pattern

et al. 1993

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Earlier studies using hot-film anemometry in pigs have revealed skewed tangentially rotating velocity profiles in the ascending aorta during systole. The reason for this phenomenon has been postulated to be caused by the left ventricular contraction pattern. Therefore, the aim of this study was to investigate the influence of the left ventricular contraction pattern on the velocity fields in the ascending aorta of pigs. We used a 10 MHz perivascular pulsed Doppler ultrasound system to measure point blood velocities at two axial locations over the entire cross sectional area in the ascending aorta of 90 kg pigs. The axial component of the velocity profiles was visualized dynamically by computerized 3-dimensional animation techniques. Changing left ventricular contraction patterns were accomplished by reversible occlusion of either the left anterior descending or right posterior descending coronary artery. The axial development of the systolic rotating and skewed velocity profiles in the ascending aorta was described. The appearance of the systolic velocity profiles were virtually unaffected by changes in left ventricular contraction pattern.

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“…However, the development of atherosclerotic disease at specific locations in the arterial system has led to the hypothesis that haemodynamic factors may also influence their development and progression (Glagov et al 1988). A number of factors related to blood flow dynamics, including high/low shear stress, flow separation region and turbulence, have been shown to strongly affect the location of atherosclerotic lesions (Lutz et al 1983;Rieu et al 1985;Ku et al 1989;Nguyen & Haque 1990;Moore et al 1992; Moore & Ku 1994;Pedersen et al 1994;Yamaguchi & Kohtoh 1994;Taylor et al 1999). For instance, the presence of flow separation regions, which is associated with low/oscillatory shear stress and local blood flow stasis at renal artery bifurcations and branching sites, is known as the main trigger for the formation of ARAS (Liepsch et al 1989;Maier et al 1989;Nguyen & Haque 1990;Yamamoto et al 1996;Kwon et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Spiral blood flow in aorta–renal bifurcation models

Javadzadegan

Simmons

Barber

2015

Computer Methods in Biomechanics and Biomedical Engineering

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The presence of a spiral arterial blood flow pattern in humans has been widely accepted. It is believed that this spiral component of the blood flow alters arterial haemodynamics in both positive and negative ways. The purpose of this study was to determine the effect of spiral flow on haemodynamic changes in aorta-renal bifurcations. In this regard, a computational fluid dynamics analysis of pulsatile blood flow was performed in two idealised models of aorta-renal bifurcations with and without flow diverter. The results show that the spirality effect causes a substantial variation in blood velocity distribution, while causing only slight changes in fluid shear stress patterns. The dominant observed effect of spiral flow is on turbulent kinetic energy and flow recirculation zones. As spiral flow intensity increases, the rate of turbulent kinetic energy production decreases, reducing the region of potential damage to red blood cells and endothelial cells. Furthermore, the recirculation zones which form on the cranial sides of the aorta and renal artery shrink in size in the presence of spirality effect; this may lower the rate of atherosclerosis development and progression in the aorta-renal bifurcation. These results indicate that the spiral nature of blood flow has atheroprotective effects in renal arteries and should be taken into consideration in analyses of the aorta and renal arteries.

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Velocity distribution along an elastic model of human arterial tree

Cited by 30 publications

References 26 publications

The impact of patient and professional diagnostic delays on survival in pharyngeal cancer

The impact of patient and professional diagnostic delays on survival in pharyngeal cancer

Velocity profiles in the ascending aorta in pigs: Axial development and influence of changes in left ventricular contraction pattern

Spiral blood flow in aorta–renal bifurcation models

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