1. Articles in category: Cardiology

    49-72 of 3851 « 1 2 3 4 5 6 ... 159 160 161 »
    1. 5‐Year clinical follow‐up of the COBRA (complex coronary bifurcation lesions: Randomized comparison of a strategy using a dedicated self‐expanding biolimus A9‐eluting stent vs. a culotte strategy using everolimus‐eluting stents) study

      5‐Year clinical follow‐up of the COBRA (complex coronary bifurcation lesions: Randomized comparison of a strategy using a dedicated self‐expanding biolimus A9‐eluting stent vs. a culotte strategy using everolimus‐eluting stents) study

      Objectives We evaluated healing responses with optical coherence tomography, and long‐term clinical outcomes after treatment with a dedicated stent versus a conventional culotte technique. Background Dedicated bifurcation stents have been proposed as an alternative treatment for coronary bifurcation lesions. The long‐term performance of dedicated stents versus conventional dual‐stent techniques for the treatment of complex coronary bifurcation lesions is unknown. Methods Forty patients with true coronary bifurcation lesions were randomized to treatment with a dedicated Axxess bifurcation stent in the proximal main vessel and additional Biomatrix stents in branches versus culotte stenting using Xience stents. Results The percentage ...

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    2. Usefulness of longitudinal reconstructed optical coherence tomography images for predicting the need for the reverse wire technique during coronary bifurcation interventions

      Usefulness of longitudinal reconstructed optical coherence tomography images for predicting the need for the reverse wire technique during coronary bifurcation interventions

      Objectives The aim is to investigate the usefulness of longitudinal reconstructed optical coherence tomography (OCT) images in selecting the reverse wire (RW) technique for inserting a guidewire into a side branch (SB). Background It is sometimes necessary to protect the SB with a guidewire to prevent SB complications in PCI for bifurcation lesions. The RW is a novel method for guidewire insertion into an extremely angulated SB when the standard antegrade wire (AW) approach is difficult. Methods This retrospective study included 46 consecutive patients who underwent OCT‐guided PCI in bifurcation lesions with significant SB stenosis. Patients were divided into ...

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    3. Association Between TG-to-HDL-C Ratio and In-Stent Stenosis Under Optical Coherence Tomography Guidance

      Association Between TG-to-HDL-C Ratio and In-Stent Stenosis Under Optical Coherence Tomography Guidance

      We determined the relevance between the TG-to-HDL-C ratio and stent restenosis. Ninety-nine patients with in-stent stenosis (ISR) who were admitted to An Zhen Hospital in Beijing between April 2014 and June 2017 were selected. At the same time, 122 patients with coronary stenosis <50% were selected. All patients were tested for TG, HDL-C, and TG/HDL-C ratio. Optical coherence tomography (OCT) can assess microscopic status in all ISR patients. The proportion of male and Diabetic patients were significantly higher for ISR. There were differences in the prevalence of cigarette smokers among the different tissue types, among which the layered tissue ...

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    4. Changes in retinal flow density measured by optical coherence tomography angiography in patients with carotid artery stenosis after carotid endarterectomy

      Changes in retinal flow density measured by optical coherence tomography angiography in patients with carotid artery stenosis after carotid endarterectomy

      The aim of the study presented here was to evaluate retinal and optic nerve head (ONH) perfusion in patients with severe asymptomatic carotid artery stenosis (CAS) compared with healthy controls and to analyze the impact of carotid endarterectomy using optical coherence tomography angiography (OCT-A). 25 eyes of 25 patients with CAS (study group) and 25 eyes of 25 healthy controls (control group) were prospectively included in this study. OCT-A was performed using RTVue XR Avanti (Optovue, Inc, Fremont, California, USA). The flow density data in the superficial and deep retinal OCT-angiogram of the macula and in the radial peripapillary capillary ...

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    5. Case reports of coronary fibromuscular dysplasia and spontaneous coronary artery dissections

      Case reports of coronary fibromuscular dysplasia and spontaneous coronary artery dissections

      Spontaneous coronary artery dissection (SCAD) is an important cause of acute coronary syndrome especially in women. The most common underlying predisposing cause of SCAD is fibromuscular dysplasia (FMD), a non‐inflammatory arteriopathy that results in weakening of the affected arteries, and can cause dissection or aneurysm. Coronary FMD (CFMD) was described as rare, and was shown to cause SCAD in histopathological case reports. Unfortunately, CFMD is challenging to diagnose on coronary angiography, as the findings can be similar to other causes of coronary artery disease. Therefore, we illustrate two case examples of CFMD on coronary angiography, and highlight findings on ...

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    6. Macrophage uptake switches on OCT contrast of superparamagnetic nanoparticles for imaging of atherosclerotic plaques

      Macrophage uptake switches on OCT contrast of superparamagnetic nanoparticles for imaging of atherosclerotic plaques

      Background: Optical coherence tomography (OCT) is an intravascular, high-resolution imaging technique that is used to characterize atherosclerotic plaques. However, the identification of macrophages as important markers of inflammation and plaque vulnerability remains difficult. Here, we investigate whether the uptake of very small iron oxide particles (VSOP) in macrophages, that cluster in phagolysosomes and allow high-quality magnetic resonance imaging (MRI) of atherosclerotic plaques, and uptake of ferumoxytol nanoparticles enhance detection of macrophages by OCT. Materials and methods: RAW 264.7 macrophage cells were incubated with VSOP (1 and 2 mM Fe) that have been clinically tested and ferumoxytol (8.9 mM ...

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    7. Optical coherence tomography substudy of a prospective multicentre randomised post-market trial to assess the safety and effectiveness of the Firehawk cobalt-chromium coronary stent (rapamycin target-eluting) system for the treatment of atherosclerotic le

      Optical coherence tomography substudy of a prospective multicentre randomised post-market trial to assess the safety and effectiveness of the Firehawk cobalt-chromium coronary stent (rapamycin target-eluting) system for the treatment of atherosclerotic le

      Aims: Durable polymer drug-eluting stents (DP-DES) may contribute to persistent inflammation, delayed endothelial healing and subsequent late DES thrombosis. The aim of this optical coherence tomography (OCT) substudy was to compare healing and neointimal coverage of a novel bioabsorbable polymer sirolimus-eluting stent (Firehawk ® ) (BP-DES) versus the DP-DES (XIENCE) at 90 days in an all-comers patient population. Methods and results: The TARGET All Comers study is a prospective multicentre randomised post-market trial of 1,656 patients randomised 1:1 to Firehawk or XIENCE at 21 centres in 10 European countries. The TARGET OCT substudy enrolled 36 consecutive patients with 52 lesions ...

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    8. Optical coherence tomography revisited: imaging and imagination

      Optical coherence tomography revisited: imaging and imagination

      Optical coherence tomography (OCT) was introduced into cardiovascular imaging in 1997 1 , emerging as a spin-off from an original scientific invention within the field of ophthalmology to enable imaging of retinal microstructures including arterioles and to facilitate detection of early degenerative changes of retinopathies. Consequently, OCT was praised as being a ground-breaking imaging technology which provides a far superior resolution as compared to the already established ultrasound-based imaging system (intravascular ultrasound [IVUS]). As such, it provides high-resolution tomographic images (10-20 µm), which enable recognition of atherosclerotic plaque patterns 2 , 3 , and can be used to identify high-risk lesions including their ...

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    9. Reproducibility of optical coherence tomography in vein grafts used for coronary revascularization

      Reproducibility of optical coherence tomography in vein grafts used for coronary revascularization

      Background: Optical coherence tomography (OCT) is a high-resolution imaging modality able to provide near-histological images of vessel walls making it possible to distinguish intima and media layers of the vessel wall separately. The use of this imaging technique is increasing while data on the variability and reliability is lacking. The aim of this study was to investigate the reproducibility of frequency-domain OCT in vein grafts used for coronary revascularization. Methods: Five pullbacks were analyzed by the same analyst with a 1-month delay (intraobserver) and by two different analysts (interobserver). Five pairs of pullbacks from the same catheters and vein graft ...

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    10. Avinger Announces Successful Treatment of First Patients Globally with Pantheris SV, a New Image-Guided Atherectomy Device Designed to Treat Smaller Vessels

      Avinger Announces Successful Treatment of First Patients Globally with Pantheris SV, a New Image-Guided Atherectomy Device Designed to Treat Smaller Vessels

      Avinger, Inc. (NASDAQ: AVGR), a commercial-stage medical device company that designs and develops the first-ever image-guided, catheter-based system that diagnoses and treats patients with peripheral artery disease (PAD), today announced the successful treatment of the first nine patients with Pantheris SV (Small Vessel) at two separate hospitals in Germany. Dr. Arne Schwindt, a vascular surgeon at St. Franziskus Hospital Muenster and longtime innovator with Lumivascular technology, performed the first procedures globally. Additional cases were performed by Dr. Ulrich Sunderdiek, an interventional radiologist and cardiac surgeon at Marienhospital Osnabrueck. Pantheris SV was used to successfully treat a variety of lesion types ...

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    11. OCT-Guided Percutaneous Coronary Intervention In Bifurcation Lesions

      OCT-Guided Percutaneous Coronary Intervention In Bifurcation Lesions

      Coronary artery bifurcation lesions remain challenging despite significant advancements in stent technology and development of specific bifurcation stenting approaches. Optical coherence tomography (OCT) is the intracoronary imaging technique with the highest resolution and can generate automatically contoured lumen areas across the variable geometry of bifurcation lesions. Knowledge of plaque severity and composition facilitates planning of the best strategy for percutaneous coronary intervention (PCI) and stenting. In particular, the provisional stent strategy preferred in this context can be modified when there is high risk of side-branch compromise at the ostium after main vessel stenting. OCT is unique because it allows the ...

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      Mentions: Carlo Di Mario
    12. Avinger Provides Third Quarter 2018 Shareholder Update

      Avinger Provides Third Quarter 2018 Shareholder Update

      Avinger, Inc. (NASDAQ: AVGR), a commercial-stage medical device company that designs and develops the first-ever image-guided, catheter-based system that diagnoses and treats patients with peripheral artery disease (PAD), today reported results for the third quarter ended September 30, 2018. Third Quarter and Recent Highlights ● Achieved revenue of $2.0 million for the third quarter of 2018 ● Announced in September that physicians at 35 sites globally have successfully treated over 200 patients with the next-generation Pantheris image-guided atherectomy system ● Submitted a new 510(k) application to the U.S Food & Drug Administration (FDA) in August for the Pantheris SV (Small Vessel ...

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      Mentions: Avinger
    13. Optical coherence tomography: Translation from 3D-printed vascular models of the anterior cerebral circulation to the first human images of implanted surface modified flow diverters

      Optical coherence tomography: Translation from 3D-printed vascular models of the anterior cerebral circulation to the first human images of implanted surface modified flow diverters

      Background The new generation of flow diverters includes a surface modification with a synthetic biocompatible polymer, which makes the device more biocompatible and less thrombogenic. Optical coherence tomography (OCT) can be used to visualize perforators, stent wall apposition, and intra-stent thrombus. Unfortunately real world application of this technology has been limited because of the limited navigability of these devices in the intracranial vessels. In this report, we share our experience of using 3D-printed neurovascular anatomy models to simulate and test the navigability of a commercially available OCT system and to show the application of this device in a patient treated ...

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    14. Understanding congenital heart defects to prevent them

      Understanding congenital heart defects to prevent them

      To understand cardiovascular failures, the leading cause of birth defect-related deaths in infants, UH professor of biomedical engineering Kirill Larin is teaming up with Baylor College of Medicine professor of cellular and molecular physiology Irina Larina on a chicken and egg hunt. "When the heart develops, it becomes stiffer as required for ability to contract and pump blood," said Larin. "So the question is - does it become stiff because it's contracting, or is it stiff to begin with because it is genetically predefined?" Surprisingly, very little is known about an embryo's developing heart. "Defining how these mechanical factors ...

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    15. Can we Predict COronary Resistance By EYE Examination ? (COREYE)

      Can we Predict COronary Resistance By EYE Examination ? (COREYE)

      Prospective interventional study, open, non-comparative and non-randomized. The research concerns physiological parameters of the coronary and ocular blood circulation. At the coronary level, the curves of pressure and Doppler flow will be extracted from ComboMap® (Philips). The coronary microvascular resistances, basal and hyperemic, will be determined by the average ratio of the distal pressure and flow. At the ocular level, a fundus oculi and an OCTA (angiography by tomography in optical coherence) examination will be performed. The measures of the FFR and the coronary microvascular resistance will be determined by a specific guidewire allowing simultaneous measures of pressure and Doppler ...

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    16. Cardiac OCT: 20 Years from Bench to Erosion

      Cardiac OCT: 20 Years from Bench to Erosion

      A 1 hr lecture on intravascular optical coherence tomography by IV-OCT pioneer Dr. IK-Kyung Jang, MD, PhD. Dr. Jang came to Massachusetts General Hospital in 1987 from Leuven University in Belgium, where he has completed his residency in medicine and fellowship in cardiology. He also successfully defended his doctorate thesis at the same university. After his advanced fellowship in cardiology at MGH, he joined the staff and is currently working as a Physician and an interventional cardiologist in the Cardiology Division. He holds currently an academic title of Professor of Medicine at Harvard Medical School. A recipient of the Partners ...

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    17. A flow cytometric and optical coherence analysis of the role of microparticles as determinants of plaque instability in acute coronary syndrome (FOAM study) (Thesis)

      A flow cytometric and optical coherence analysis of the role of microparticles as determinants of plaque instability in acute coronary syndrome (FOAM study) (Thesis)

      Introduction: Microparticles (MPs) are implicated in the pathogenesis of coronary artery disease (CAD). / Aims: To determine whether circulating MPs correlate with high-risk coronary atherosclerotic plaque phenotype. / Methods: 25 patients with CAD undergoing percutaneous coronary intervention (PCI) were recruited; 13 were diagnosed to have acute coronary syndrome (ACS) & 12 with stable angina (SA). We characterized and compared coronary atherosclerotic plaque burden and vulnerable plaque phenotype by three-vessel optical coherence tomography (OCT) between ACS and SA groups. Endothelial (EMPs), platelet (PMPs), Neutrophil (NMPs), tissue factor (TFMPs) and smooth muscle (SMMPs) were quantified by flow cytometry, compared between groups pre PCI, post PCI ...

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    18. Numerical Investigation of Atherosclerotic Plaque Rupture using Optical Coherence Tomography Imaging and XFEM

      Numerical Investigation of Atherosclerotic Plaque Rupture using Optical Coherence Tomography Imaging and XFEM

      Myocardial infarction contributes to most fatalities in which atherosclerotic plaque disruption is the underlying pathology. From the mechanics view point, the pulsatile blood flow in the arteries resembles a fatigue environment and generates stresses that affect the rupture of the atherosclerotic plaque. In this context, patient-specific optical coherence tomography (OCT) was used to develop the fatigue crack growth behavior. The impact of location specific morphological features and their relative effect on plaque life were discussed. EXtended Finite Element Method (XFEM) and Paris’ Law were employed to investigate the fatigue crack growth. Twelve 2D slices from six patients were reconstructed for ...

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    19. Association Between Insulin Resistance and Coronary Plaque Vulnerability in Patients With Acute Coronary Syndromes: Insights From Optical Coherence Tomography

      Association Between Insulin Resistance and Coronary Plaque Vulnerability in Patients With Acute Coronary Syndromes: Insights From Optical Coherence Tomography

      We investigated the correlation between insulin resistance (IR) and optical coherence tomography and identified culprit plaque characteristics in patients with acute coronary syndrome (ACS). Patients with ACS who underwent selective coronary intervention were prospectively enrolled. A total of 159 culprit lesions were identified in 145 patients. Culprit plaque characteristics, including thin-cap fibroatheroma (TCFA) and spotty calcification, were analyzed. The IR was assessed using the homeostasis model assessment of IR (HOMA-IR). Patients were divided into 4 interquartile ranges (IQRs) according to HOMA-IR values. The prevalence rates of TCFA were significantly different among the 4 groups (17.5% [IQR1 group] vs 17 ...

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    20. Imaging cellular structures of atherosclerotic coronary arteries using circumferentially scanning micro-optical coherence tomography fiber probe ex vivo

      Imaging cellular structures of atherosclerotic coronary arteries using circumferentially scanning micro-optical coherence tomography fiber probe ex vivo

      Development and progression of coronary atherosclerotic lesions is mediated by a number of cellular components, which are not readily visualized using the current clinical investigation tools. Visualizing these cellular components in situ and in vivo may allow early detection of the vulnerable plaques, with implications for coronary artery disease (CAD) therapy and for the prevention of acute myocardial infarction (AMI). In this study, we have developed a fiber-optic micro-optical coherence tomography (µOCT) probe for intravascular use. We conducted ex vivo imaging experiments in normal swine aorta and human atherosclerotic coronary arteries, and demonstrate that the fiber-probe based µOCT could delineate ...

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    49-72 of 3851 « 1 2 3 4 5 6 ... 159 160 161 »
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