Simple Analysis of the Pulse Wave for Blood Vessel Evaluation

Saito, Masashi; Yamamoto, Yoshiyuki; Matsukawa, Mami; Watanabe, Yoshiaki; Furuya, Mio; Asada, Takaaki

doi:10.1143/jjap.48.07gj09

Cited by 14 publications

(19 citation statements)

References 13 publications

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“…This technique will be useful for the medical evaluation of vessel wall elasticity. 17) However, in the analysis, we assumed the blood vessel as an elastic tube and estimated the forward wave from the blood flow velocity waveform. Of course, this assumption should be carefully considered because the actual vessel wall is a viscoelastic material.…”

Section: Introductionmentioning

confidence: 99%

Effect of Viscoelasticity of Vessel Walls on Pulse Wave

Saito¹,

Yamamoto²,

Matsukawa³

et al. 2010

Jpn. J. Appl. Phys.

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The pulse wave comes from the displacement of surface skin and is composed of incident and reflected waves. Since the properties of the reflected wave change considerably owing to the viscoelasticity of the vessel walls, the analysis of the reflected wave is considered to be useful for evaluating arterial stiffness; thereby, appropriate estimation of the incident wave is important for separating the pulse wave. Here, the incident wave is generated by a forward wave, which is the intravascular pressure caused by blood flow. In the former analysis, we assumed the blood vessel as an elastic tube and estimated the forward wave from the blood flow velocity waveform. In this study, we used a viscoelastic model to estimate a more appropriate forward wave. In this estimation, we used viscoelastic properties similar to those of bovine aorta, human aorta, or human artery. The estimated forward waves showed that the difference in the viscous properties of vessel walls causes minimal changes in the forward waves, which were also similar to that estimated using the elastic model. The result tells us that the elastic model is acceptable and useful for the estimation of forward wave, incident wave, and reflected wave, which enables the simple evaluation of the viscoelastic properties of vessel walls. #

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Section: Introductionmentioning

confidence: 99%

Effect of Viscoelasticity of Vessel Walls on Pulse Wave

Saito¹,

Yamamoto²,

Matsukawa³

et al. 2010

Jpn. J. Appl. Phys.

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“…1. By assuming the model artery to be an elastic tube, we estimated the pressure wave from the measured flow velocity waveform using a one-dimensional continuity equation and an elastic model [2,3] .…”

Section: Estimation Of Reflected Wavementioning

confidence: 99%

“…Because attenuation of the reflected wave changes markedly due to the arterial stiffness, wave properties of this reflected wave give us information of arterial stiffness. In previous study, we have proposed a simple method to extract the reflected wave from the observed pulse wave [2,3] , and pointed that the amplitudes of the reflected wave increased owing to age. However, the propagation properties of the reflected wave were not perfectly investigated.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Pulse Wave Propagation in a Human Artery Model

Yamamoto

Saito

Ikenaga

et al. 2011

Jpn. J. Appl. Phys.

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We study DBI-type effective theory of an unstable D3-brane in the background manifold R 1,1 × M 2 where M 2 is an arbitrary two-dimensional manifold. We obtain an exact tubular D2-brane solution of arbitrary cross sectional shape by employing 1/ cosh tachyon potential. When M 2 = S 2 , the solution is embedded in the background geometry R 1,3 × S 2 of Salam-Sezgin model. This tachyon potential shows a unique property that an array of tachyon soliton solutions has a fixed period which is independent of integration constants of the equations of motion. The thin BPS limit of the configurations leads to supertubes of arbitrary cross sectional shapes.

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“…change dramatically due to the age. This seems to result from decreasing the force of cardiac contraction with the age and the superposition of the reflected waves with negative amplitude of blood flow [4].…”

Section: B Data Collectionmentioning

confidence: 99%

“…In previous study, we focused on the pulse wave measured on the skin surface as one such technique [4]. The pulse wave is a wave composed of the displacement components due to the forward and backward pressure waves.…”

Section: Introductionmentioning

confidence: 99%

Estimation of reflected wave in carotid pulse wave for simple and noninvasive assessment of arterial stiffness

Saito

Yamamoto

Shibayama

et al. 2010

2010 IEEE International Ultrasonics Symposium

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Evaluation of a pulse wave is effective for screening arteriosclerosis. The pulse wave is composed of two components, incident and reflected waves. Because attenuation of the reflected wave changes markedly due to the arterial stiffness, analyzing this wave is useful. In previous study, we proposed a separation technique of two components using observed pulse waves and blood flow velocity waveforms. We confirmed that maximum values of estimated reflected waves increased with age. However, the measurement of the blood flow still needs an ultrasonic diagnostic equipment, which results in a barrier for simple screening. In this study, empirical model functions of blood flow velocity are introduced for each age group. The functions were obtained by averaging the blood flow velocity waveforms after normalizing them by the time interval between maximum amplitude and incisura. We then investigated the applicability of these functions for the estimation of the reflected waves. In consequence, we found small differences between the amplitudes of reflected waves estimated by personal waveform and empirical model function. The idea of this empirical model function is reasonable and eliminates the use of ultrasonic diagnostic system.

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Simple Analysis of the Pulse Wave for Blood Vessel Evaluation

Cited by 14 publications

References 13 publications

Effect of Viscoelasticity of Vessel Walls on Pulse Wave

Effect of Viscoelasticity of Vessel Walls on Pulse Wave

Experimental Study on the Pulse Wave Propagation in a Human Artery Model

Estimation of reflected wave in carotid pulse wave for simple and noninvasive assessment of arterial stiffness

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