1. Articles in category: Cardiology

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    1. A patient with multiple Swiss cheese aspect coronary lesions: optical coherence tomography to guide coronary angioplasty

      A patient with multiple Swiss cheese aspect coronary lesions: optical coherence tomography to guide coronary angioplasty

      Although spontaneous recanalization of coronary thrombi has been reported pathologically, it is rarely recognized in clinical practice. We presented a rare case of recanalized thrombi of the right coronary artery and distal left anterior descending artery in a patient with an anterior ST segment elevation myocardial infarction treated with primary percutaneous intervention of the proximal left anterior descending artery. Optical coherence tomography aspect of right coronary artery was consistent with a ‘Swiss cheese’ appearance that represented recanalization of organized thrombi. Optical coherence tomography has been essential to discriminate the underlying mechanism and may provide useful information for an appropriate treatment ...

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    2. Alterations of Hyaluronan Metabolism in Acute Coronary Syndrome: Implications for Plaque Erosion

      Alterations of Hyaluronan Metabolism in Acute Coronary Syndrome: Implications for Plaque Erosion

      Background Superficial erosion currently causes at least one-third of acute coronary syndromes (ACS), and its incidence is increasing. Yet, the underlying mechanisms in humans are still largely unknown. Objectives The authors sought to assess the role of hyaluronan (HA) metabolism in ACS. Methods Peripheral blood mononuclear cells were collected from ACS (n = 66), stable angina (SA) (n = 55), and control (CTRL) patients (n = 45). The authors evaluated: 1) gene expression of hyaluronidase 2 (HYAL2) (enzyme degrading high-molecular-weight HA to its proinflammatory 20-kDa isoform) and of CD44v1, CD44v4, and CD44v6 splicing variants of HA receptor; and 2) HYAL2 and CD44 protein ...

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      Mentions: Rocco Vergallo
    3. First Human Evaluation of Endothelial Healing after a Pipeline Flex Embolization Device with Shield Technology Implanted in Posterior Circulation Using Optical Coherence Tomography

      First Human Evaluation of Endothelial Healing after a Pipeline Flex Embolization Device with Shield Technology Implanted in Posterior Circulation Using Optical Coherence Tomography

      A 64-year-old female presented with an incidentally-discovered right posterior inferior cerebral artery (PICA) aneurysm, initially treated in 2015 by simple coiling. Follow-up demonstrated significant coil compaction that required retreatment. Retreatment was done uneventfully using a Pipeline embolization device (PED) shield deployed starting from the basilar artery and ending at the V4 segment of the vertebral artery. Eight-weeks post-deployment, a follow-up digital subtraction imaging (DSA) and intravascular imaging with optical coherence tomography were obtained. The intravascular imaging demonstrated that the flow diverter had good wall apposition and concentric neointimal growth over the braid with exception to the areas that the PED ...

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      Mentions: St. Jude Medical
    4. System for coregistration of optical coherence tomography and angiographic X-ray image data

      System for coregistration of optical coherence tomography and angiographic X-ray image data

      A system comprises a catheter including a lens, for acquiring optical coherence tomography images within the vessel of interest as the catheter is being retracted from the vessel in the presence of contrast agent. An X-ray imaging system interface receives a first set of X-ray images of an anatomical region including the vessel of interest containing the catheter. The first set of X-ray images are acquired at points corresponding to the particular points within a heart cycle, while the catheter is stationary in the vessel, in response to a heart electrical activity representative signal and in the absence of contrast ...

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      Mentions: Siemens
    5. Assessing coronary plaques: non-invasive and intracoronary imaging and haemodynamic measurements

      Assessing coronary plaques: non-invasive and intracoronary imaging and haemodynamic measurements

      Atherosclerotic plaque is the hidden culprit of angina and infarction. Commonly, we assume that a coronary plaque that causes ischaemia and/or angina is clinically relevant, although we have learned that even non-obstructive plaques can cause acute coronary syndromes. 1–3 The assessment of haemodynamically relevant plaques is challenging. The so-called gold standard, i.e. coronary angiography, only provides an estimate of the significance of luminal narrowing as it provides only a two-dimensional pictures of the lumen and, unless it is analysed quantitatively, also involves a lot of subjectivity. Intracoronary imaging with intravascular ultrasound (IVUS) and optical coherence tomography (OCT ...

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    6. Acute myocardial infarction secondary to blunt chest trauma in motorcycle accident: A rare combination where percutaneous coronary intervention and intravascular imaging optimization are needed

      Acute myocardial infarction secondary to blunt chest trauma in motorcycle accident: A rare combination where percutaneous coronary intervention and intravascular imaging optimization are needed

      Blunt chest trauma is a common occurrence in vehicle accident. Cardiac injuries following nonpenetrating thoracic trauma have been reported. ST‐elevation myocardial infarction (STEMI) due to coronary artery involvement is a rare but extremely serious condition for the high risk of undetected diagnosis. Blunt thoracic trauma may obscure typical chest pain associated with cardiac ischemia especially in patients with high tolerance of pain or secondary administration of analgesic drugs. We report two consecutive cases of young adults admitted to our emergency department after motorcycle accident and concomitant anterior STEMI due to occlusion of left anterior descending artery. In both cases ...

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    7. OPTICAL COHERENCE TOMOGRAPHY FOR CORONARY ARTERY DISEASE (Thesis)

      OPTICAL COHERENCE TOMOGRAPHY FOR CORONARY ARTERY DISEASE (Thesis)

      The aim of this thesis was to develop a software pipeline for tissue analysis in IVOCT by systematically addressing different open questions for analysis. In Chapter 2, we report on a first attempt to quantify the correlation between the position of the catheter with respect to the luminal wall and the image intensities. We implemented the Depth-Resolved (DR) model for IVOCT images in Chapter 3. In addition to the attenuation coefficient, we further extended the model to estimate a backscatter term, and proposed an algorithm to exclude the noisy region. For the first time, it was implemented in IVOCT images ...

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    8. Microbubble contrast enhancement of neointima after drug-eluting stent implantation: an optical coherence tomography study

      Microbubble contrast enhancement of neointima after drug-eluting stent implantation: an optical coherence tomography study

      Microvessels within neoatherosclerosis are associated with vulnerability and increase from the early to the very late phase after drug-eluting stent implantation. Microbubble contrast agents have been suggested to enhance tissue microvasculature for optical coherence tomography (OCT) imaging. The present study investigated whether OCT signal intensity of neointima within stented segments was enhanced after intracoronary administration of microbubble contrast agents. A total of 40 patients who underwent follow-up coronary angiography after drug-eluting stent implantation were enrolled. At the time of follow-up coronary angiography, OCT images of the stented segments were recorded before and after intracoronary administration of microbubble contrast agents. Mean ...

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      Mentions: Kenichi Fujii
    9. In vivo imaging of complicated atherosclerotic plaque – role of optical coherence tomography (OCT)

      In vivo imaging of complicated atherosclerotic plaque – role of optical coherence tomography (OCT)

      Cardiovascular diseases are the main cause of death worldwide, with coronary artery disease (CAD) being the predominant underlying etiology. Coronary angiography (CA) is the current invasive method used for CAD diagnosis, as well as for defining the coronary interventional treatment strategy. However, CA offers sometimes-poor accuracy in estimating atherosclerotic plaque volume, morphology and degree of stenosis severity. Optical coherence tomography (OCT) is an intracoronary imaging technique, developed in order to overcome CA limitations and is considered to be an “optical biopsy” that provides in vivo imaging. OCT has an extremely high resolution, similar to that of a usual histological evaluation ...

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    10. Correlation between CD4+CD28null T lymphocytes, regulatory T cells and plaque rupture: An Optical Coherence Tomography study in Acute Coronary Syndromes

      Correlation between CD4+CD28null T lymphocytes, regulatory T cells and plaque rupture: An Optical Coherence Tomography study in Acute Coronary Syndromes

      Background A sizeable proportion of patients with Acute Coronary Syndromes (ACS) shows a unique adaptive immune system profile, associated to a worse outcome, characterized by higher CD4 + CD28 null T-cells, lower regulatory T-cells (Treg) and increased CD4 + CD28 null /Treg ratio. We sought to investigate the correlation between CD4 + CD28 null T-cells, Treg, CD4 + CD28 null /Treg ratio and plaque phenotype as assessed by Optical Coherence Tomography (OCT). Methods Peripheral blood mononuclear cells (PBMC) were collected from 30 Non-ST Elevation Myocardial Infarction (NSTEMI) patients, sub-grouped according to OCT analysis of culprit lesions into two cohorts: Ruptured Fibrous Cap (NSTEMI-RFC, n ...

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      Mentions: Rocco Vergallo
    11. Lesional Evaluation of High Risk Patients With Neoatherosclerosis Treated With Rosuvastatin and Eicosapentaenoic Acid Using Optical Coherence Tomography(OCT)[LINK It Two]

      Lesional Evaluation of High Risk Patients With Neoatherosclerosis Treated With Rosuvastatin and Eicosapentaenoic Acid Using Optical Coherence Tomography(OCT)[LINK It Two]

      Eicosapentaenoic acid and statin therapy prevents cardiovascular events. However, the impact of these treatment in patients with in-stent neoatherosclerosis has not been clarified. So, the investigators conducted LINK IT study. This study showed that eicosapentaenoic acid(EPA) and rosuvastatin therapy improve lipid index in patients compared with rosuvastatin alone therapy. However, it was insufficient to directly evaluate the efficacy of additional effect of EPA for neoatherosclerosis. Because, statin dose of two groups was different and type of stent was variety. Therefore, the investigators designed a new prospective, randomized OCT study. The OCT operators randomly assigned 75 patients who were detected ...

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    12. Avinger Announces Successful Treatment of 200th Patient with Next-Generation Pantheris Device

      Avinger Announces Successful Treatment of 200th Patient with Next-Generation Pantheris Device

      Avinger, Inc. (NASDAQ: AVGR), a leading developer of innovative treatments for peripheral artery disease (PAD), today announced that physicians in 35 sites globally have successfully treated over 200 patients with the next-generation Pantheris image-guided atherectomy system for the treatment of peripheral artery disease (PAD). The next-generation Pantheris was launched on a limited basis in the U.S. following receipt of 510(k) clearance from the U.S. Food and Drug Administration (FDA) in late May 2018. The next-generation Pantheris device features a number of improvements intended to augment the performance and reliability of the design, including a simplified single balloon ...

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      Mentions: FDA Avinger
    13. Cooperative Three-View Imaging Optical Coherence Tomography for Intraoperative Vascular Evaluation

      Cooperative Three-View Imaging Optical Coherence Tomography for Intraoperative Vascular Evaluation

      Real-time intraoperative optical coherence tomography (OTC) imaging of blood vessels after anastomosis operation can provide important information the vessel, such as patency, flow speed, and thrombosis morphology. Due to the strong scattering and absorption effect of blood, normal OCT imaging suffers from the problem of incomplete cross-sectional view of the vessel under investigation when the diameter is large. In this work, we present a novel cooperative three-view imaging spectral domain optical coherence tomography system for intraoperative exposed vascular imaging. Two more side views (left view and right view) were realized through a customized sample arm optical design and corresponding mechanical ...

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    14. A Patient-Specific Study Investigating the Relation between Coronary Hemodynamics and Neo-Intimal Thickening after Bifurcation Stenting with a Polymeric Bioresorbable Scaffold

      A Patient-Specific Study Investigating the Relation between Coronary Hemodynamics and Neo-Intimal Thickening after Bifurcation Stenting with a Polymeric Bioresorbable Scaffold

      We present an application of a validated reconstruction methodology for the comparison between patient-specific hemodynamics and neo-intimal thickening at nine months from the intervention. (1) Background: Coronary bifurcation stenting alters the vessel geometry, influencing the local hemodynamics. The evaluation of wall shear stress (WSS) relies on the application of computational fluid dynamics to model its distribution along the coronary tree. The endothelium actively responds to WSS, which triggers eventual cell proliferation to cover the stent struts. (2) Methods: Baseline optical coherence tomography and angiographic data were combined to reconstruct a patient-specific coronary bifurcation with an implanted bioresorbable scaffold and to ...

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    15. Avinger Announces 510(k) Filing of Pantheris Small Vessel Device

      Avinger Announces 510(k) Filing of Pantheris Small Vessel Device

      Avinger, Inc. (NASDAQ:AVGR), a leading developer of innovative treatments for peripheral artery disease (PAD), today announced the Company submitted a new 510(k) application to the U.S Food & Drug Administration (FDA) for the Pantheris SV (Small Vessel) Lumivascular atherectomy system. Pantheris SV is a line extension of the Pantheris family of catheters, the first and only image-guided atherectomy devices for the treatment of PAD. Designed with a lower profile and longer length, Pantheris SV is intended to expand the number of addressable procedures for Pantheris by allowing physicians to target lesions in smaller diameter vessels and more distal ...

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      Mentions: Avinger
    16. Optical coherence tomographic analysis of drug-eluting in-stent restenosis at different times: A STROBE compliant study

      Optical coherence tomographic analysis of drug-eluting in-stent restenosis at different times: A STROBE compliant study

      The imaging characteristics of drug-eluting in-stent restenosis (ISR) at different times varied; however, the mechanism had not yet been elucidated. To analyze the imaging characteristics of drug-eluting ISR at different time points by optical coherence tomography (OCT) and investigate the cause of the stent treatment failure. A total of 70 patients with drug-eluting ISR undergoing OCT were enrolled (intimal hyperplasia ≥50% of stent area) and implanted with drug-eluting stents . According to stent implantation time, the patients were divided into 2 groups: early in-stent restenosis group (E-ISR group) (group A, n = 35, stent age ≤12 months) and late in-stent restenosis group ...

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    17. Automatic Side Branch Detection in Optical Coherence Tomography Images Using Adjacent Frame Correlation Information

      Automatic Side Branch Detection in Optical Coherence Tomography Images Using Adjacent Frame Correlation Information

      Side branch detection is particularly important in clinical applications such as surgical planning, quantification of side branch size, and hemodynamics. Intravascular optical coherence tomography (IVOCT) is a novel imaging modality based on high axial resolution (10–16 μ m) and a better signal-to-noise ratio, which provides greater detail of the vessel lumen. Traditionally, physicians spend a significant amount of time manually marking side branches; thus, in the present study, we demonstrated an automatic side branch detection method using adjacent frame correlation. This method was divided into distance computing of a single frame, gradient computing of the width of the candidate region ...

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    18. Avinger Completes Enrollment in SCAN Clinical Study Comparings OCT Imaging with IVUS for Diagnostic Imaging in Peripheral Arteries

      Avinger Completes Enrollment in SCAN Clinical Study Comparings OCT Imaging with IVUS for Diagnostic Imaging in Peripheral Arteries

      Post-Market Study Compares Pantheris OCT Imaging with IVUS for Diagnostic Imaging in Peripheral Arteries Avinger, Inc. (NASDAQ: AVGR), a leading developer of innovative treatments for peripheral artery disease (PAD), today announced that it has completed enrollment in the SCAN clinical study, a post-market study comparing optical coherence tomography (OCT) with intravascular ultrasound (IVUS) as a diagnostic imaging tool in the peripheral arteries. Avinger’s proprietary Lumivascular technology utilizes OCT to provide real-time vascular imaging for the diagnosis and treatment of peripheral artery disease. OCT is a light-based, high-definition imaging modality, which generates no X-ray radiation, and has a resolution approximately ...

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      Mentions: FDA Avinger
    19. Impact of Real-time Angiographic Co-registered OCT on PCI Results - the OPTICO-integration II Study

      Impact of Real-time Angiographic Co-registered OCT on PCI Results - the OPTICO-integration II Study

      Intracoronary optical coherence tomography (OCT) imaging allows for high-resolution characterization of coronary lesions. Difficulties in matching cross-sectional OCT-images with angiographic lesion localization, however, may limit its clinical utilization. The investigators sought to prospectively assess the impact of a novel system of real-time OCT-coregistration with angiography (ACR) compared to OCT alone and to the clinical standard proceeding (angiographic guided-PCI) all used for coronary lesion evaluation before percutaneous coronary interventions (PCI). The investigators hypothesize that the use of ACR will lead to less incidence of insufficient covered coronary lesions (geographical mismatch) and/or a less rate of edge dissections after PCI (combined ...

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    1-24 of 3730 1 2 3 4 ... 154 155 156 »
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