keyword
MENU ▼
Read by QxMD icon Read
search

Intravascular optical coherence tomography

keyword
https://www.readbyqxmd.com/read/27896495/accuracy-of-coronary-computed-tomography-angiography-for-bioresorbable-scaffold-luminal-investigation-a-comparison-with-optical-coherence-tomography
#1
Carlos Collet, Yohei Sotomi, Rafael Cavalcante, Taku Asano, Yosuke Miyazaki, Erhan Tenekecioglu, Pieter Kistlaar, Yaping Zeng, Pannipa Suwanasson, Robbert J de Winter, Koen Nieman, Patrick W Serruys, Yoshinobu Onuma
To establish the accuracy of coronary computed tomography angiography (CTA) for in-scaffold quantitative evaluation with optical coherence tomography (OCT) as a reference. The translucent backbone of the bioresorbable scaffold allow us to evaluate non-invasively the coronary lumen with coronary CTA. In the ABSORB first-in-man studies, coronary CTA was shown to be feasible for quantitative luminal assessment. Nevertheless, a comparison with an intravascular modality with higher resolution has never been performed...
November 28, 2016: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/27867732/dynamic-contrast-optical-coherence-tomography-images-transit-time-and-quantifies-microvascular-plasma-volume-and-flow-in-the-retina-and-choriocapillaris
#2
Conrad W Merkle, Conor Leahy, Vivek J Srinivasan
Despite the prevalence of optical imaging techniques to measure hemodynamics in large retinal vessels, quantitative measurements of retinal capillary and choroidal hemodynamics have traditionally been challenging. Here, a new imaging technique called dynamic contrast optical coherence tomography (DyC-OCT) is applied in the rat eye to study microvascular blood flow in individual retinal and choroidal layers in vivo. DyC-OCT is based on imaging the transit of an intravascular tracer dynamically as it passes through the field-of-view...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27867716/automatic-classification-of-atherosclerotic-plaques-imaged-with-intravascular-oct
#3
Jose J Rico-Jimenez, Daniel U Campos-Delgado, Martin Villiger, Kenichiro Otsuka, Brett E Bouma, Javier A Jo
Intravascular optical coherence tomography (IV-OCT) allows evaluation of atherosclerotic plaques; however, plaque characterization is performed by visual assessment and requires a trained expert for interpretation of the large data sets. Here, we present a novel computational method for automated IV-OCT plaque characterization. This method is based on the modeling of each A-line of an IV-OCT data set as a linear combination of a number of depth profiles. After estimating these depth profiles by means of an alternating least square optimization strategy, they are automatically classified to predefined tissue types based on their morphological characteristics...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27866137/clinical-and-multimodality-imaging-results-at-6-months-of-a-bioresorbable-sirolimus-eluting-scaffold-for-patients-with-single-de-novo-coronary-artery-lesions-the-neovas-first-in-man-trial
#4
Yao-Jun Zhang, Xiao-Zeng Wang, Guosheng Fu, Quan-Min Jing, Geng Wang, Chong-Ying Jin, Li-Hua Xie, Jin-Zan Cai, Bo Xu, Ya-Ling Han
AIMS: The study sought to investigate clinical and multimodality imaging assessment of a bioresorbable sirolimus-eluting scaffold (NeoVas, Lepu Medical, Beijing, China) for patients with single de novo coronary artery lesions. METHODS AND RESULTS: The NeoVas first-in-man study was a prospective, open-label study which enrolled 31 patients with single de novo lesions treated with a bioresorbable sirolimus-eluting scaffold. The primary endpoint was target lesion failure (TLF), a composite of cardiac death, target vessel myocardial infarction and clinically indicated target lesion revascularisation (TLR)...
November 20, 2016: EuroIntervention
https://www.readbyqxmd.com/read/27866017/safety-of-optical-coherence-tomography-in-pediatric-heart-transplant-patients
#5
Sarah M Ulrich, Anja Lehner, Julia Birnbaum, Stefanie Heckel, Nikolaus A Haas, Lale Hakami, Rene Schramm, Robert Dalla Pozza, Marcus Fischer, Rainer Kozlik-Feldmann
BACKGROUND: Cardiac allograft vasculopathy (CAV) is a crucial problem after heart transplantation, in adults as well as in children. CAV is the main risk factor for a reduced long-term graft survival. The early diagnosis and treatment of CAV is essential for a successful long-term preservation of the donor heart. However, asymptomatic progression of CAV and concentric hyperplasia of the coronary arteries may complicate the early diagnosis by conventional measures. Intravascular imaging, such as intravascular ultrasound and optical coherence tomography (OCT), enables the diagnosis of early stage CAV...
November 9, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27862314/impact-of-diabetes-mellitus-on-intravascular-ultrasound-guided-provisional-stenting-in-coronary-bifurcation-lesions-j-reverse-sub-study
#6
Masahiro Yamawaki, Daisuke Terashita, Hachidai Takahashi, Toshiro Shinke, Kenichi Fujii, Yoshihisa Shimada, Yoshihiro Takeda, Shinichiro Yamada, Yoshihisa Kinoshita, Yoshinobu Murasato
OBJECTIVE: To investigate the impact of diabetes mellitus (DM) on provisional coronary bifurcation stenting under the complete guidance of intravascular-ultrasound (IVUS). BACKGROUND: The efficacy of such intervention has not yet been fully elucidated in the DM patients. METHODS: A total of 100 DM and 139 non-DM patients in a prospective multi-center registry of IVUS-guided bifurcation stenting were compared in angiographic results at 9 months...
December 2016: Journal of Interventional Cardiology
https://www.readbyqxmd.com/read/27836501/evaluation-of-a-framework-for-the-co-registration-of-intravascular-ultrasound-and-optical-coherence-tomography-coronary-artery-pullbacks
#7
David S Molony, Lucas H Timmins, Emad Rasoul-Arzrumly, Habib Samady, Don P Giddens
A growing number of studies have used a combination of intravascular ultrasound (IVUS) and optical coherence tomography (OCT) for the assessment of atherosclerotic plaques. Given their respective strengths these imaging modalities highly complement each other. Correlations of hemodynamics and coronary artery disease (CAD) have been extensively investigated with both modalities separately, though not concurrently due to challenges in image registration. Manual co-registration of these modalities is a time expensive task subject to human error, and the development of an automatic method has not been previously addressed...
October 28, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27832420/disruption-of-bioresorbable-vascular-scaffold-struts-due-to-loss-of-radial-integrity-insights-from-optical-coherence-tomography
#8
Ana Rita Ramalho, João Silva Marques, Guilherme Mariano Pêgo
Strut disruption of bioresorbable vascular scaffold is a known potential concern, although uncommon when adequate lesion preparation is achieved and nominal size of the scaffold is respected. It is usually difficult to detect with angiography and/or intravascular ultrasound. Three-dimensional reconstructions of optical coherence tomography facilitates understanding of complex luminal anatomy and configuration of stent struts, providing evaluation of stent integrity immediately after deployment and therefore optimization of the complex revascularization procedure...
November 10, 2016: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/27806900/optical-coherence-tomography-compared-with-intravascular-ultrasound-and-with-angiography-to-guide-coronary-stent-implantation-ilumien-iii-optimize-pci-a-randomised-controlled-trial
#9
Ziad A Ali, Akiko Maehara, Philippe Généreux, Richard A Shlofmitz, Franco Fabbiocchi, Tamim M Nazif, Giulio Guagliumi, Perwaiz M Meraj, Fernando Alfonso, Habib Samady, Takashi Akasaka, Eric B Carlson, Massoud A Leesar, Mitsuaki Matsumura, Melek Ozgu Ozan, Gary S Mintz, Ori Ben-Yehuda, Gregg W Stone
BACKGROUND: Percutaneous coronary intervention (PCI) is most commonly guided by angiography alone. Intravascular ultrasound (IVUS) guidance has been shown to reduce major adverse cardiovascular events (MACE) after PCI, principally by resulting in a larger postprocedure lumen than with angiographic guidance. Optical coherence tomography (OCT) provides higher resolution imaging than does IVUS, although findings from some studies suggest that it might lead to smaller luminal diameters after stent implantation...
November 26, 2016: Lancet
https://www.readbyqxmd.com/read/27773862/possible-mechanical-causes-of-scaffold-thrombosis-insights-from-case-reports-with-intracoronary-imaging
#10
Yohei Sotomi, Pannipa Suwannasom, Patrick W Serruys, Yoshinobu Onuma
The advent of intracoronary stents greatly increased the safety and applicability of percutaneous coronary interventions. One of the drawbacks of drug eluting stents (DES) is the increased risk of late and very late stent thrombosis (ST). The risk of ST after the DES implantation were anticipated to be solved with the advent of fully biodegradable scaffolds which offers the possibility of transient scaffolding of the vessel to prevent acute vessel closure and recoil while also transiently eluting an antiproliferative drug to counteract the constrictive remodeling and excessive neointimal hyperplasia...
October 25, 2016: EuroIntervention
https://www.readbyqxmd.com/read/27751322/late-stent-collapse-identified-with-oct-an-underdiagnosed-mechanism-of-restenosis
#11
Nimit C Shah, Peter D O'Kane, Jehangir N Din
Very late stent recoil is a rare albeit recognized phenomenon leading to subsequent in-stent restenosis. Angiography alone may not be adequate in making the diagnosis, and intravascular imaging with optical coherence tomography (OCT) is far superior in confirming the diagnosis and guiding subsequent management. We describe a case with interesting coronary angiogram and OCT images demonstrating very rare diagnosis of the late stent collapse. These images provide a valuable insight into a novel mechanism responsible for late target lesion failure...
September 2016: Indian Heart Journal
https://www.readbyqxmd.com/read/27729666/-peripartum-spontaneous-coronary-artery-dissection-a-case-report
#12
Giovanni Teruzzi, Giuseppe Calligaris, Paolo Ravagnani, Daniela Trabattoni, Luca Grancini, Giovanni Monizzi, Alessandro Lualdi, Antonio L Bartorelli
Spontaneous coronary artery dissection (SCAD) accounts approximately for 0.2% of cases of acute coronary syndrome. It is defined "spontaneous" in absence of any coronary wall damage. This disease affects primarily young women in good health, with no risk factors for coronary artery disease, especially during the postpartum period. Since the clinical presentation varies widely from no symptoms to typical angina and sudden cardiac death, SCAD incidence is underestimated.A 40-year-old woman, in the 8th week after delivery, was admitted to our emergency department because of acute chest pain, and a diagnosis of inferior and posterior non-ST-elevation myocardial infarction was made...
October 2016: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/27717991/-bifurcation-lesions-how-should-they-be-assessed-and-treated
#13
H M Nef, O Dörr, H Möllmann, A Elsässer
Bifurcation lesions are a therapeutic challenge in the interventional treatment of coronary artery disease. Thus, consideration of anatomical aspects and selection of the most appropriate strategy for an individual bifurcation have an impact on the interventional outcome. Accordingly, assessment of the type of bifurcation stenosis, including the relevance of the side branches, vessel diameter and the angle between the two branches are critical for the optimal choice of interventional strategy. The fractional flow reserve (FFR) is a parameter that provides a measure of the severity of coronary stenosis and despite some limitations, FFR can be applied to bifurcation lesions...
October 7, 2016: Herz
https://www.readbyqxmd.com/read/27717579/ivus-and-oct-guided-primary-percutaneous-coronary-intervention-for-spontaneous-coronary-artery-dissection-with-bioresorbable-vascular-scaffolds
#14
Muhammad Muzaffar Mahmood, David Austin
Spontaneous coronary artery dissection (SCAD) is an uncommon but important cause of acute coronary syndrome. The diagnosis of SCAD by an angiogram alone can be challenging and the increasing use of intracoronary imaging has proven an invaluable diagnostic adjunct in this regard. The appropriate initial management of SCAD has been a matter of significant debate. Owing to frequent spontaneous healing of coronary dissection and a higher risk of complications with percutaneous coronary intervention (PCI) in the setting of SCAD, a default approach of mechanical revascularization is not recommended...
September 18, 2016: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/27682603/non-invasive-imaging-of-retinal-blood-flow-in-myeloproliferative-neoplasms
#15
Anne Willerslev, Mathias M Hansen, Oliver Niels Klefter, Ole Weis Bjerrum, Hans C Hasselbalch, Stine N Clemmensen, Michael Larsen, Inger Christine Munch
PURPOSE: To study the circulation in the retinal vessels in patients with blood dyscrasia due to myeloproliferative neoplasms using non-invasive retinal imaging. METHODS: Prospective consecutive case series of seven treatment-naïve patients with chronic myeloid leukaemia (n = 2), polycythemia vera (n = 4), essential thrombocytosis (n = 1) examined before and after cytoreductive treatment. We investigated retinal circulation with motion-contrast imaging, retinal oximetry and spectral-domain optical coherence tomography...
September 29, 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27676648/optical-coherence-tomography-in-drug%C3%A2-eluting-stent-restenosis-a-technique-in-need-of-a-strategy
#16
Sebastian Kufner, Erion Xhepa, Christoph Lutter, Salvatore Cassese, Michael Joner
Owing to the overall increase in the use of DES, the number of patients presenting with DES restenosis is not insignificant in absolute terms. When DES restenosis occurs, it represents a challenging clinical entity in terms of classification and treatment. By providing near histology-level images, intravascular optical coherence tomography (OCT) has been used to describe vascular responses following PCI. Subsequently, OCT has been introduced to assess neointimal morphology and tissue characteristics of restenotic lesions to clarify the underlying pathophysiology...
February 2017: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/27641357/short-sheath-benefit-in-radial-artery-injury-after-pci-optical-coherence-tomography-serial-study
#17
Tereza Novakova, Jan Kanovsky, Roman Miklik, Otakar Bocek, Martin Poloczek, Petr Jerabek, Lenka Privarova, Tomas Ondrus, Jiri Jarkovsky, Klara Benesova, Jindrich Spinar, Petr Kala
BACKGROUND AND AIMS: Transradial catheterization is the predominant access site for coronary catheterization and percutaneous coronary interventions (PCI). Previous studies have reported a high incidence of radial artery (RA) injury. The aim of this investigation was to evaluate the incidence of RA injury using last generation optical coherence tomography (OCT) intravascular imaging in a serial manner. METHODS: 100 patients with a diagnosis of non-ST-elevation myocardial infarction (nSTEMI) treated by PCI were enrolled...
September 2016: Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia
https://www.readbyqxmd.com/read/27631482/optical-coherence-tomography-angiography-of-chorioretinal-diseases
#18
Eduardo A Novais, Luiz Roisman, Paulo Ricardo Chaves de Oliveira, Ricardo N Louzada, Emily D Cole, Mark Lane, Marco Bonini Filho, André Romano, João Rafael de Oliveira Dias, Caio V Regatieri, David Chow, Rubens Belfort, Philip Rosenfeld, Nadia K Waheed, Daniela Ferrara, Jay S Duker
Fluorescein angiography (FA) and indocyanine green angiography (ICGA) have been the gold standard for the evaluation of retinal and choroidal vasculature in the last three decades and have revolutionized the diagnosis of retinal and choroidal vascular diseases. The advantage of these imaging modalities lies in their ability to document retinal and choroidal vasculature through the dynamic assessment of contrast transit over time in the intravascular and extravascular spaces. However, disadvantages include the absence of depth resolution, blurring of details by contrast leakage, and the inability to selectively evaluate different levels of the retinal and choroidal microvasculature...
September 1, 2016: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/27626250/-decision-making-while-implantation-of-biodegradable-vascular-scaffolds-absorb-based-on-methods-of-intravascular-visualization
#19
I V Buzaev, V V Plechev, I E Nikolaeva, I G Zagitov, B A Oleĭnik
A series of studies demonstrated comparability of the incidence rate of major adverse cardiac events (MACE) in the middle-term postoperative period following implantation of last-generation drug-coated stents and biodegradable intravascular scaffolds. It was noted observed that these complications may be associated with malposition and inadequate inappropriate preparation of the lesion. We carried out a total of 16 percutaneous coronary interventions (PCI) with implantation of absorbable vascular scaffolds (Absorb, Abbott Vascular) under the guidance of optical coherent tomography...
2016: Angiologii︠a︡ i Sosudistai︠a︡ Khirurgii︠a︡, Angiology and Vascular Surgery
https://www.readbyqxmd.com/read/27620900/optical-coherence-tomography-attenuation-imaging-for-lipid-core-detection-an-ex-vivo-validation-study
#20
Muthukaruppan Gnanadesigan, Ali S Hussain, Stephen White, Simon Scoltock, Andreas Baumbach, Antonius F W van der Steen, Evelyn Regar, Thomas W Johnson, Gijs van Soest
Lipid-core atherosclerotic plaques are associated with disease progression, procedural complications, and cardiac events. Coronary plaque lipid can be quantified in optical coherence tomography (OCT) pullbacks by measurement of lipid arcs and lipid lengths; parameters frequently used in clinical research, but labor intensive and subjective to analyse. In this study, we investigated the ability of quantitative attenuation, derived from intravascular OCT, to detect plaque lipid. Lipid cores are associated with a high attenuation coefficient...
September 12, 2016: International Journal of Cardiovascular Imaging
keyword
keyword
61017
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"