Coronary artery atherectomy reduces plaque shear strains: An endovascular elastography imaging study

Keshavarz‐Motamed, Zahra; Saijo, Yoshifumi; Majdouline, Younes; Riou, Laurent; Ohayon, Jacques; Cloutier, Guy

doi:10.1016/j.atherosclerosis.2014.04.022

Cited by 19 publications

(19 citation statements)

References 59 publications

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“…With the proposed method (CPW + Inc + timeensemble averaging), we are now able to estimate all components of the plane strain tensor. With our previous implementation [7], we were only able to reliably estimate the axial strain and shear in the case of NIVE, and radial strain and shear in the case of EVE [52]. The current LSME implementation may be extended to EVE (using standard intravascular ultrasound focusing scheme) and help understanding the complex mechanical behavior of coronary arteries.…”

Section: In Vivo Feasibilitymentioning

confidence: 99%

“…Vascular strain analysis has recently gained a lot of interest [48][49][50][51][52][53][54] as elevated shear movements might be associated with plaque development leading to its rupture. For examples, recent in vivo studies using endovascular elastography (EVE) on a diabetic pig model [51] and on humans, prior and following coronary atherectomy interventions [52] revealed the potential of radial shear strains to detect and classify atherosclerotic plaques according to American Heart Association classes [55].…”

Section: In Vivo Feasibilitymentioning

confidence: 99%

“…For examples, recent in vivo studies using endovascular elastography (EVE) on a diabetic pig model [51] and on humans, prior and following coronary atherectomy interventions [52] revealed the potential of radial shear strains to detect and classify atherosclerotic plaques according to American Heart Association classes [55]. Those studies also revealed a significant correlation between the radial shear strain magnitude and the level of inflammation and soft plaque content.…”

Section: In Vivo Feasibilitymentioning

confidence: 99%

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Noninvasive Vascular Elastography With Plane Strain Incompressibility Assumption Using Ultrafast Coherent Compound Plane Wave Imaging

Porée

Garcia

Chayer

et al. 2015

IEEE Trans. Med. Imaging

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Plane strain tensor estimation using non-invasive vascular ultrasound elastography (NIVE) can be difficult to achieve using conventional focus beamforming due to limited lateral resolution and frame rate. Recent developments in compound plane wave (CPW) imaging have led to high speed and high resolution imaging. In this study, we present the performance of NIVE using coherent CPW. We show the impact of CPW beamforming on strain estimates compared to conventional focus sequences. To overcome the inherent variability of lateral strains, associated with the low lateral resolution of linear array transducers, we use the plane strain incompressibility to constrain the estimator. Taking advantage of the approximate tenfold increase in frame rate of CPW compared with conventional focus imaging, we introduce a time-ensemble estimation approach to further improve the elastogram quality. By combining CPW imaging with the constrained Lagrangian speckle model estimator, we observe an increase in elastography quality (∼ 10 dB both in signal-to-noise and contrast-to-noise ratios) over a wide range of applied strains (0.02 to 3.2%).

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Section: In Vivo Feasibilitymentioning

confidence: 99%

Section: In Vivo Feasibilitymentioning

confidence: 99%

Section: In Vivo Feasibilitymentioning

confidence: 99%

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Noninvasive Vascular Elastography With Plane Strain Incompressibility Assumption Using Ultrafast Coherent Compound Plane Wave Imaging

Porée

Garcia

Chayer

et al. 2015

IEEE Trans. Med. Imaging

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“…However, several investigators are now developing methods to visualize shear strains because (1) peak shear strains and the American Heart Association classification of atherosclerotic plaques (Stary, 2000) are correlated, and (2) cyclic shear strains in the adventitia could trigger neovascular proliferation and destabilize plaques (Wan et al, 2014; Majdouline et al, 2014b; Keshavarz-Motamed et al, 2014). Unfortunately, coordinate dependency limits the performance of vascular elastography.…”

Section: Introductionmentioning

confidence: 99%

Principal Strain Vascular Elastography: Simulation and Preliminary Clinical Evaluation

Nayak

Huntzicker

Ohayon

et al. 2017

Ultrasound in Medicine & Biology

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It is difficult to produce reliable polar strain elastograms (radial and circumferential) because the center of carotid artery is typically unknown. Principal strain imaging can overcome this limitation, but suboptimal lateral displacement estimates measured with conventional ultrasonic imaging methods make this an impractical approach for visualizing the mechanical properties within the carotid artery. We hypothesize that compounded plane wave imaging can minimize this problem. To corroborate this hypothesis, we performed (a) simulations with vessels of varying morphology and mechanical behavior (i.e., isotropic and transversely isotropic), and (b) a pilot study with 10 healthy volunteers. The accuracy of principal and polar strain (computed using knowledge of the precise vessel center) elastograms varied between 7–17%. In both types of elastograms, strain concentrated at the junction between the fibrous cap and the vessel wall, and the strain magnitude decreased with increasing fibrous cap thickness. Elastograms obtained from healthy volunteers were consistent with those obtained from transversely isotropic homogeneous vessels; they were spatially asymmetric–a trend that was common to both principal and polar strains. No significant differences were observed in the mean strain recovered from principal and polar strains (p > 0.05). This investigation demonstrates that principal strain elastograms measured with compounding plane wave imaging overcame problems incurred when polar strain elastograms are computed with imprecise estimates of the vessel center.

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“…extended arc of calcium or significant fibrosis) may assist the decision to use preemptive atherectomy. 25 …”

Section: Anatomical Assessment and Intervention Guidancementioning

confidence: 99%

Impact of Intravascular Ultrasound in Clinical Practice

Vásquez

Mistry

Singh

2014

Interventional Cardiology Review

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Intravascular ultrasound (IVUS) has expanded our understanding of atherosclerotic plaque morphology, and provides an opportunity to guide cardiovascular interventions and evaluate results. Use of this technique requires understanding of ultrasound physics, catheter differences, skills in vessel, plaque and stent quantification and knowledge of artifacts and various physiologic and pathologic findings. Optimal cardiovascular interventions should result in absence of inflow or outflow obstruction, precise geographic landing, while attaining the largest feasible luminal gain without plaque protrusion, vessel dissection or perforation and, if deployed, with complete stent expansion and apposition to the vessel wall. IVUS is safe, cost efficient and effectively optimises cardiovascular interventions. In addition, IVUS improves outcomes when used to guide coronary interventions using bare metal stents (BMS) and drug eluting stents (DES). The role of IVUS in endovascular therapy is rapidly expanding. This review will focus on the impact of IVUS in clinical practice.

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Coronary artery atherectomy reduces plaque shear strains: An endovascular elastography imaging study

Cited by 19 publications

References 59 publications

Noninvasive Vascular Elastography With Plane Strain Incompressibility Assumption Using Ultrafast Coherent Compound Plane Wave Imaging

Noninvasive Vascular Elastography With Plane Strain Incompressibility Assumption Using Ultrafast Coherent Compound Plane Wave Imaging

Principal Strain Vascular Elastography: Simulation and Preliminary Clinical Evaluation

Impact of Intravascular Ultrasound in Clinical Practice

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