Wave intensity analysis in the great arteries – What has been learnt during the last 25 years? Part 1

Kolyva, Christina; Khir, Ashraf W.

doi:10.17987/icfj.v1i2.23

Cited by 3 publications

(3 citation statements)

References 67 publications

(94 reference statements)

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“…The non‐linear separation of waves has previously been presented in several studies 59. However, Equation (7) is mostly used for practical applications through WIA.…”

Section: Methodsmentioning

confidence: 99%

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Impact of tapering of arterial vessels on blood pressure, pulse wave velocity, and wave intensity analysis using one‐dimensional computational model

Abdullateef

Harana

Khir

2020

Numer Methods Biomed Eng

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The angle of arterial tapering increases with ageing, and the geometrical changes of the aorta may cause an increase in central arterial pressure and stiffness. The impact of tapering has been primarily studied using frequency‐domain transmission line theories. In this work, we revisit the problem of tapering and investigate its effect on blood pressure and pulse wave velocity (PWV) using a time‐domain analysis with a 1D computational model. First, tapering is modelled as a stepwise reduction in diameter and compared with results from a continuously tapered segment. Next, we studied wave reflections in a combination of stepwise diameter reduction of straight vessels and bifurcations, then repeated the experiments with decreasing the length to physiological values. As the model's segments became shorter in length, wave reflections and re‐reflections resulted in waves overlapping in time. We extended our work by examining the effect of increasing the tapering angle on blood pressure and wave intensity in physiological models: a model of the thoracic aorta and a model of upper thoracic and descending aorta connected to the iliac bifurcation. Vessels tapering inherently changed the ratio between the inlet and outlet cross‐sectional areas, increasing the vessel resistance and reducing the compliance compared with non‐tapered vessels. These variables influence peak and pulse pressure. In addition, it is well established that pulse wave velocity increases in an ageing arterial tree. This work provides confirmation that tapering induces reflections and offers an additional explanation to the observation of increased peak pressure and decreased diastolic pressure distally in the arterial tree.

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“…The non‐linear separation of waves has previously been presented in several studies 59. However, Equation (7) is mostly used for practical applications through WIA.…”

Section: Methodsmentioning

confidence: 99%

“…In normal physiological condition, during early systole, a forward compression wave (FCW) increases both pressure and blood velocity 51. During mid‐systole, the arrival of a backward compression wave (BCW) causes an increase in pressure but a decrease in velocity.…”

Section: Methodsmentioning

confidence: 99%

Impact of tapering of arterial vessels on blood pressure, pulse wave velocity, and wave intensity analysis using one‐dimensional computational model

Abdullateef

Harana

Khir

2020

Numer Methods Biomed Eng

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“…The wave intensity analysis (WIA) technique is most suitable for studying ventricular–arterial coupling [16] as it has been validated on the bench [17], used in vitro with the airways [18], in vivo [19] and clinical investigations [20,21], including ventricular assist devices [22]. Extensive reviews of the various applications of WIA have been provided elsewhere [23,24], but briefly WIA was initially introduced as a time-domain technique for analysing wave propagation, and the ventricular–arterial interaction [25]. Previous studies have shown that the forward compression wave (FCW) in early systole relates to left ventricular (LV) myocardial contractility, the backward compression wave (BCW) in mid-systole relates to peripheral reflections and forward decompression wave (FDW) in end-systole correlates with LV early diastolic performance [26].…”

Section: Introductionmentioning

confidence: 99%

Stiffening and ventricular–arterial interaction in the ascending aorta using MRI

Hickson

McEniery

et al. 2019

Journal of Hypertension

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Ventriculo-arterial Coupling in Fontan Patients

Biglino

Ordóñez

Taylor

2022

Modelling Congenital Heart Disease

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Wave intensity analysis in the great arteries – What has been learnt during the last 25 years? Part 1

Abstract: Wave intensity analysis in the great arteries – What has been learnt during the last 25 years? Part 1

Cited by 3 publications

References 67 publications

Impact of tapering of arterial vessels on blood pressure, pulse wave velocity, and wave intensity analysis using one‐dimensional computational model

Impact of tapering of arterial vessels on blood pressure, pulse wave velocity, and wave intensity analysis using one‐dimensional computational model

Stiffening and ventricular–arterial interaction in the ascending aorta using MRI

Ventriculo-arterial Coupling in Fontan Patients

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