Impulse propagation in normal and stenosed vessels

Newman, D. L.; Greenwald, Stephen E.; Denyer, H.T.

doi:10.1093/cvr/15.4.190

Cited by 28 publications

(4 citation statements)

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“…The results of the renal graft selective angiography were reevaluated: an arteriographic narrowing ≥50% was considered significant for arterial stenosis combined with the clinical history of the patients, as reported by Hagen and Ghazanfar [ 19 , 20 ]. The results validate the mathematical relationship between wall impedance and blood flow disturbances [ 26 , 27 ].…”

Section: Discussionsupporting

confidence: 77%

Donor/Recipient Delta Age: A Possible Risk for Arterial Stenosis in Renal Transplantation

Pallotti

Donati²,

Capelli³

et al. 2015

Computational and Mathematical Methods in Medicine

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Different arterial wall properties can significantly increase the risk of blood turbulent fluxes leading to complications such as atherosclerosis. Since the mechanical properties of arterial vessels are influenced by age, we investigated, in a retrospective study, the effects on renal artery stenosis of an age difference >15 years between donor and recipient in a cohort of 164 patients undergoing renal transplantation between 1981 and 1991. The age difference between donor and recipient was ≤15 years in 87 patients (53.0%) (Group A) and >15 years in 77 patients (47.0%) (Group B, p = ns). None of the Group A patients developed an anastomotic arterial stenosis, whereas 8/77 Group B patients (10.4%) had an anastomotic arterial stenosis (p < 0.001). This study shows that an age difference >15 years is significantly linked to the risk of developing arterial stenosis after renal transplantation. Indeed, different wall properties can significantly increase the risk of generation of blood turbulent fluxes and involve, in the arterial vessels, the development of complications such as atherosclerosis.

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Section: Discussionsupporting

confidence: 77%

Donor/Recipient Delta Age: A Possible Risk for Arterial Stenosis in Renal Transplantation

Pallotti

Donati²,

Capelli³

et al. 2015

Computational and Mathematical Methods in Medicine

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“…Previous work on blood wave dissipation includes invitro models and in-vivo measurements including waves in the vena cava [8][9][10][11][12][13][14][15][16][17]. However, although it is widely accepted that measured pressure waveforms consist of the linear summation of the incident and reflected waveforms [18], the majority of previous work investigating wave dissipation used only the measured pressure waveforms [19,20].…”

Section: Background Of Wave Dissipationmentioning

confidence: 99%

The compression and expansion waves of the forward and backward flows: An in-vitro arterial model

Feng

Khir

2008

Proc Inst Mech Eng H

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Although the propagation of arterial waves of forward flows has been studied before, that of backward flows has not been thoroughly investigated. The aim of this research is to investigate the propagation of the compression and expansion waves of backward flows in terms of wave speed and dissipation, in flexible tubes. The aim is also to compare the propagation of these waves with those of forward flows. A piston pump generated a flow waveform in the shape of approximately half-sinusoid, in flexible tubes (12 mm and 16 mm diameter). The pump produced flow in either the forward or the backward direction by moving the piston forward, in a 'pushing action' or backward, in a 'pulling action', using a graphite brushes d.c. motor. Pressure and flow were measured at intervals of 5 cm along each tube and wave speed was determined using the PU-loop method. The simultaneous measurements of diameter were also taken at the same position of the pressure and flow in the 16 mm tube. Wave intensity analysis was used to determine the magnitude of the pressure and velocity waveforms and wave intensity in the forward and backward directions. Under the same initial experimental conditions, wave speed was higher during the pulling action (backward flow) than during the pushing action (forward flow). The amplitudes of pressure and velocity in the pulling action were significantly higher than those in the pushing action. The tube diameter was approximately 20 per cent smaller in the pulling action than in the pushing action in the 16 mm tube. The compression and expansion waves resulting from the pushing and pulling actions dissipated exponentially along the travelling distance, and their dissipation was greater in the smaller than in the larger tubes. Local wave speed in flexible tubes is flow direction- and wave nature-dependent and is greater with expansion than with compression waves. Wave dissipation has an inverse relationship with the vessel diameter, and dissipation of the expansion wave of the pulling action was greater than that of the pushing action.

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“…Anliker et al ( , 1971, Anliker and Maxwell (1968) and Anliker (1974) studied wave dissipation in blood vessels in the frequency domain using wave-trains techniques and found that for the frequency range they considered, the amplitude of waves attenuated exponentially with the distance per wavelengths. Newman et al (1981) also carried out experimental work on wave propagation and found that impulse waves attenuated along the distance travelled as an approximately mono-exponential function in both latex rubber tubes and the aorta of dogs.…”

Section: Introductionmentioning

confidence: 99%

Wave dissipation in flexible tubes in the time domain: In vitro model of arterial waves

Feng¹,

Long²,

Khir³

2007

Journal of Biomechanics

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Impulse propagation in normal and stenosed vessels

Cited by 28 publications

References 0 publications

Donor/Recipient Delta Age: A Possible Risk for Arterial Stenosis in Renal Transplantation

Donor/Recipient Delta Age: A Possible Risk for Arterial Stenosis in Renal Transplantation

The compression and expansion waves of the forward and backward flows: An in-vitro arterial model

Wave dissipation in flexible tubes in the time domain: In vitro model of arterial waves

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