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Intravascular ultrasound

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https://www.readbyqxmd.com/read/27906702/diagnostic-accuracy-of-intraluminal-blood-speckle-intensity-on-intravascular-ultrasound-for-physiological-assessment-of-coronary-artery-stenosis
#1
Yuichi Saito, Hideki Kitahara, Takashi Nakayama, Yoshihide Fujimoto, Yoshio Kobayashi
OBJECTIVES: The difference in intraluminal intensity of blood speckle (IBS) on integrated backscatter intravascular ultrasound (IVUS) across the coronary stenosis was reportedly correlated with fractional flow reserve (FFR) in the left descending coronary artery. The aim of this study was to investigate the novel physiological assessment using IVUS in all coronary arteries. PATIENTS AND METHODS: Fifty-four patients with 57 coronary lesions underwent both FFR and IVUS...
November 30, 2016: Coronary Artery Disease
https://www.readbyqxmd.com/read/27904017/what-does-intravascular-ultrasound-illustrate
#2
Osamu Iida, Mitsuyoshi Takahara
No abstract text is available yet for this article.
November 29, 2016: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/27895986/combined-frequency-domain-photoacoustic-and-ultrasound-imaging-for-intravascular-applications
#3
Robin F Castelino, Michael Hynes, Chelsea E Munding, Sergey Telenkov, F Stuart Foster
Intravascular photoacoustic (IVPA) imaging has the potential to characterize lipid-rich structures based on the optical absorption contrast of tissues. In this study, we explore frequency domain photoacoustics (FDPA) for intravascular applications. The system employed an intensity-modulated continuous wave (CW) laser diode, delivering 1W over an intensity modulated chirp frequency of 4-12MHz. We demonstrated the feasibility of this approach on an agar vessel phantom with graphite and lipid targets, imaged using a planar acoustic transducer co-aligned with an optical fibre, allowing for the co-registration of IVUS and FDPA images...
November 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27895243/contrast-less-stent-placement-for-vertebral-artery-origin-stenosis
#4
Shinzo Ota, Yoshinobu Sekihara, Takahiro Himeno, Yasue Tanaka, Tatsuya Ohtonari
We performed stent placement under intravascular ultrasound (IVUS), without the use of contrast medium, in a male patient in his 70s who had vertebral artery origin stenosis and decreased renal function. Satisfactory dilatation was achieved without complications, and the patient remained asymptomatic at 2 years of follow-up. We now report the details of this procedure. Stent placement under IVUS guidance may be useful in patients in whom contrast medium is contraindicated.
November 28, 2016: Interventional Neuroradiology
https://www.readbyqxmd.com/read/27893376/a-modulated-excitation-imaging-system-for-intravascular-ultrasound
#5
Weibao Qiu, Xingying Wang, Yan Chen, Qiang Fu, Min Su, Lining Zhang, Jingjing Xia, Jiyan Dai, Yaonan Zhang, Hairong Zheng
Advances in methodologies and tools often lead to new insights into cardiovascular diseases. Intravascular ultrasound (IVUS) is a well-established diagnostic method that provides high-resolution images of the vessel wall and atherosclerotic plaques. High-frequency (>50 MHz) ultrasound enables the spatial resolution of IVUS to approach that of optical imaging methods. However, the penetration depth decreases when using higher imaging frequencies due to the greater acoustic attenuation. An imaging method that improves the penetration depth of high-resolution IVUS would therefore be of major clinical importance...
November 22, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27893049/a-novel-approach-to-assess-the-in-situ-versus-ex-vivo-mechanical-behaviors-of-the-coronary-artery
#6
Ruoya Wang, Julia Raykin, Luke P Brewster, Rudolph L Gleason
Ex vivo mechanical testing has provided tremendous insight toward prediction of the in vivo mechanical behavior and local mechanical environment of the arterial wall; however, the role of perivascular support on the local mechanical behavior of arteries is not well understood. Here, we present a novel approach for quantifying the impact of the perivascular support on arterial mechanics using intravascular ultrasound (IVUS) on cadaveric porcine hearts. We performed pressure-diameter tests (n = 5) on the left anterior descending coronary arteries (LADCAs) in situ while embedded in their native perivascular environment using IVUS imaging and after removal of the perivascular support of the artery...
January 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/27881556/nitrite-and-s-nitrosohemoglobin-exchange-across-the-human-cerebral-and-femoral-circulation-relationship-to-basal-and-exercise-blood-flow-responses-to-hypoxia
#7
Damian M Bailey, Peter Rasmussen, Morten Overgaard, Kevin A Evans, Aske M Bohm, Thomas Seifert, Patrice Brassard, Morten Zaar, Henning B Nielsen, Peter Raven, Niels H Secher
BACKGROUND: -The mechanisms underlying red blood cell (RBC)-mediated hypoxic vasodilation remain controversial with separate roles for nitrite (NO2(-)) and S-nitrosohemoglobin (SNO-Hb) widely contested given their ability to transduce nitric oxide (NO) bioactivity within the microcirculation. To establish their relative contribution in vivo, we quantified arterial-venous (a-v) concentration gradients across the human cerebral and femoral circulation at rest and during exercise, an ideal model system characterized by physiological extremes of O2 tension and blood flow...
November 15, 2016: Circulation
https://www.readbyqxmd.com/read/27876264/intravascular-ultrasound-and-near-infrared-spectroscopic-characterization-of-thin-cap-fibroatheroma
#8
Shinji Inaba, Gary S Mintz, Allen P Burke, Gregg W Stone, Renu Virmani, Mitsuaki Matsumura, Rupa Parvataneni, Rishi Puri, Stephen J Nicholls, Akiko Maehara
Thin-cap fibroatheromas (TCFAs) are considered precursors for plaque rupture and subsequent acute coronary events. We investigated intravascular ultrasound (IVUS) and near-infrared spectroscopy (NIRS) characteristics of lesions that were histopathologic TCFAs. IVUS, NIRS, and histopathology were performed in 271 atherosclerotic lesions from 107 fresh coronary arteries from 54 patients at necropsy. The plaque burden and remodeling index calculated by IVUS and maximum lipid core burden index within any 4-mm segment (maxLCBI4mm) calculated by NIRS were compared among each plaque type based on histopathologic classifications but focusing on TCFA...
October 31, 2016: American Journal of Cardiology
https://www.readbyqxmd.com/read/27876181/analysis-of-suboptimal-stent-deployment-using-intravascular-ultrasound-and-coronary-pressure-pullback-measurement
#9
Nobuhiro Tanaka, Nico H J Pijls, Jun Yamashita, Yo Kimura, Masashi Ogawa, Naotaka Murata, Kunihiro Sakoda, Kou Hoshino, Youhei Hokama, Akira Yamashina
BACKGROUND: There are some cases in whom a sufficient improvement in fractional flow reserve (FFR) could not be achieved even if anatomical results indicated satisfactory stent deployment. We investigated the relation of abnormal findings between intravascular ultrasound (IVUS) and coronary pressure pullback measurement (CP-PB). METHODS: IVUS and CP-PB were investigated after stent deployment in 60 vessels in 53 patients. CP-PB criterion for adequate stent deployment was defined as a ratio of coronary pressure at the stent distal edge to the proximal edge (Psd/Psp) that is greater than 0...
November 18, 2016: Journal of Cardiology
https://www.readbyqxmd.com/read/27876180/gray-scale-intravascular-ultrasound-sheds-light-on-the-importance-of-vasa-vasorum-in-unstable-coronary-plaque
#10
EDITORIAL
Takashi Kubo, Takashi Akasaka
No abstract text is available yet for this article.
November 18, 2016: Journal of Cardiology
https://www.readbyqxmd.com/read/27876049/geographical-predisposition-influences-on-the-distribution-and-tissue-characterisation-of-eccentric-coronary-plaques-in-non-branching-coronary-arteries-cross-sectional-study-of-coronary-plaques-analysed-by-intravascular-ultrasound
#11
Hidenori Komiyama, Hitoshi Takano, Shunichi Nakamura, Masamichi Takano, Noritake Hata, Miyauchi Yasushi, Yoshihiko Seino, Kyoichi Mizuno, Wataru Shimizu
BACKGROUND: We investigated the influence of geographical predisposition on the spatial distribution and composition of coronary plaques. METHODS: Thirty coronary arteries were evaluated. A total of 1441 cross-sections were collected from intravascular ultrasound (IVUS) and radio-frequency signal-based virtual histology (VH-IVUS) imaging. To exclude complex geographical effects of side branches and to localise the plaque distribution, we analysed only eccentric plaques in non-branching regions...
November 22, 2016: Cardiovascular Ultrasound
https://www.readbyqxmd.com/read/27869217/magnesium-alloy-covered-stent-for-treatment-of-a-lateral-aneurysm-model-in-rabbit-common-carotid-artery-an-in-vivo-study
#12
Wu Wang, Yong-Li Wang, Mo Chen, Liang Chen, Jian Zhang, Yong-Dong Li, Ming-Hua Li, Guang-Yin Yuan
Magnesium alloy covered stents have rarely been used in the common carotid artery (CCA). We evaluated the long-term efficacy of magnesium alloy covered stents in a lateral aneurysm model in rabbit CCA. Magnesium alloy covered stents (group A, n = 7) or Willis covered stents (group B, n = 5) were inserted in 12 New Zealand White rabbits and they were followed up for 12 months. The long-term feasibility for aneurysm occlusion was studied through angiograms; the changes in vessel area and lumen area were assessed with IVUS...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27867639/using-sound-advice-intravascular-ultrasound-as-a-diagnostic-tool
#13
COMMENT
Yasir Parviz, Khady N Fall, Ziad A Ali
No abstract text is available yet for this article.
October 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/27867141/sex-differences-in-plaque-characteristics-by-intravascular-imaging-in-patients-with-coronary-artery-disease
#14
Monique E Ten Haaf, Melissa Rijndertse, Jin M Cheng, Sanneke P de Boer, Hector M Garcia Garcia, Robert-Jan M van Geuns, Evelyn Regar, Mattie J Lenzen, Yolande Appelman, Eric Boersma
AIMS: We aimed to study sex differences in coronary plaque burden and plaque composition in patients with coronary artery disease (CAD). METHODS AND RESULTS: Virtual histology intravascular ultrasound (VH-IVUS) and near-infrared spectroscopy (NIRS) imaging of a non-culprit coronary artery was performed in 178 (23.5%) women and 581 men who underwent invasive management of stable angina pectoris (SAP) or acute coronary syndrome (ACS). Women were older and had a worse cardiovascular risk profile than men, but less extended angiographic coronary disease...
November 22, 2016: EuroIntervention
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
#15
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/27866136/biodegradable-polymer-based-argatroban-eluting-cobalt-chromium-stent-jf-04-for-treatment-of-native-coronary-lesions-final-results-of-the-first-in-man-study-and-lessons-learned
#16
Yoshihiro Morino, Tetsuya Tobaru, Satoshi Yasuda, Kazuaki Kataoka, Kengo Tanabe, Atsushi Hirohata, Ken Kozuma, Takeshi Kimura
AIMS: The aim of the study was to investigate the six-month angiographic and nine-month clinical follow-up outcomes in a first-in-man study using the biodegradable polymer-based cobalt-chromium argatroban-eluting stent (JF-04) for treatment of native coronary atherosclerotic lesions. METHODS AND RESULTS: A total of 31 patients with either stable or unstable angina, or silent myocardial ischaemia, exhibiting de novo coronary lesions were enrolled at seven Japanese sites...
November 20, 2016: EuroIntervention
https://www.readbyqxmd.com/read/27866017/safety-of-optical-coherence-tomography-in-pediatric-heart-transplant-patients
#17
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/27865004/long-term-effects-of-high-intensity-interval-training-in-heart-transplant-recipients-a-5-year-follow-up-study-of-a-randomized-controlled-trial
#18
Marianne Yardley, Lars Gullestad, Bjørn Bendz, Elisabeth Bjørkelund, Katrine Rolid, Satish Arora, Kari Nytrøen
BACKGROUND: Previously studies have demonstrated that high-intensity interval training(HIT) is superior to moderate-continuous exercise in general and in cardiovascular diseases. Recently we also found HIT safe and efficient after heart transplantation(HTx). This study reports the 5-year long-term effects. DESIGN AND METHODS: Forty-one HTx-patients who had completed the previous 12-month randomized controlled trial, comparing HIT-intervention with usual care, were eligible...
November 12, 2016: Clinical Transplantation
https://www.readbyqxmd.com/read/27864454/minimal-medial-injury-after-orbital-atherectomy-an-intravascular-ultrasound-analysis
#19
Prakash Krishnan, Brad J Martinsen, Arthur Tarricone, Anvar Babaev, Akiko Maehara
No abstract text is available yet for this article.
November 17, 2016: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/27864303/diagnosis-of-left-ventricular-assist-device-outflow-graft-obstruction-using-intravascular-ultrasound
#20
Hellmuth R Muller Moran, Malek Kass, Amir Ravandi, Shelley Zieroth, S Allan Schaffer, Francisco J Cordova, Zlatko I Pozeg, Rakesh C Arora, Rohit K Singal
No abstract text is available yet for this article.
December 2016: Circulation. Heart Failure
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