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Coronary computed tomography

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https://www.readbyqxmd.com/read/28324943/overcoming-spatio-temporal-limitations-using-dynamically-scaled-in-vitro-pc-mri-a-flow-field-comparison-to-true-scale-computer-simulations-of-idealized-stented-and-patient-specific-left-main-bifurcations
#1
Susann Beier, John Ormiston, Mark Webster, John Cater, Stuart Norris, Pau Medrano-Gracia, Alistair Young, Kathleen Gilbert, Brett Cowan
The majority of patients with angina or heart failure have coronary artery disease. Left main bifurcations are particularly susceptible to pathological narrowing. Flow is a major factor of atheroma development, but limitations in imaging technology such as spatio-temporal resolution, signal-to-noise ratio (SNRv), and imaging artefacts prevent in vivo investigations. Computational fluid dynamics (CFD) modelling is a common numerical approach to study flow, but it requires a cautious and rigorous application for meaningful results...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324126/relationship-between-cardiac-calcification-and-left-ventricular-hypertrophy-in-patients-with-chronic-kidney-disease-at-hemodialysis-initiation
#2
Ken Kitamura, Hideki Fujii, Kentaro Nakai, Keiji Kono, Shunsuke Goto, Tatsuya Nishii, Atsushi Kono, Shinichi Nishi
Coronary artery calcification (CAC), cardiac valve calcification (CVC) and left ventricular hypertrophy (LVH) are frequently observed in chronic kidney disease (CKD) patients. These abnormalities significantly affect morbidity and mortality. The aim of this study was to investigate the relationship between CAC, CVC and LVH in CKD patients. This study included 96 patients who were hospitalized and initiated hemodialysis between December 2011 and July 2014 at our five institutions. Multi-detector computed tomography for the quantification of CAC using the Agatston score and transthoracic echocardiography for assessing CVC and LVH were performed for all patients included in the study...
March 21, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/28315622/subclinical-atherosclerosis-statin-eligibility-and-outcomes-in-african-american-individuals-the-jackson-heart-study
#3
Ravi V Shah, Aferdita Spahillari, Stanford Mwasongwe, J Jeffrey Carr, James G Terry, Robert J Mentz, Daniel Addison, Udo Hoffmann, Jared Reis, Jane E Freedman, Joao A C Lima, Adolfo Correa, Venkatesh L Murthy
Importance: Modern prevention guidelines substantially increase the number of individuals who are eligible for treatment with statins. Efforts to refine statin eligibility via coronary calcification have been studied in white populations but not, to our knowledge, in large African American populations. Objective: To compare the relative accuracy of US Preventive Services Task Force (USPSTF) and American College of Cardiology/American Heart Association (ACC/AHA) recommendations in identifying African American individuals with subclinical and clinical atherosclerotic cardiovascular disease (ASCVD)...
March 18, 2017: JAMA Cardiology
https://www.readbyqxmd.com/read/28315492/long-term-in-vivo-corrosion-behavior-biocompatibility-and-bioresorption-mechanism-of-a-bioresorbable-nitrided-iron-scaffold
#4
Wenjiao Lin, Li Qin, Haiping Qi, Deyuan Zhang, Gui Zhang, Runlin Gao, Hong Qiu, Ying Xia, Ping Cao, Xiang Wang, Wei Zheng
Pure iron as a potential bioresorbable material for bioresorbable coronary scaffold has major disadvantages of slow corrosion and bioresorption. However, so far, there are neither quantitative data of long-term in vivo corrosion nor direct experimental evidence for bioresorption of pure iron and its alloys, which are fundamental and vital for developing novel Fe-based alloys overcoming the intrinsic drawbacks of pure iron. This work systemically investigated scaffold performance, long-term in vivo corrosion behavior and biocompatibility of a nitrided iron coronary scaffold and explored its bioresorption mechanism...
March 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28306696/n-terminal-fragment-of-b-type-natriuretic-peptide-predicts-coexisting-subclinical-heart-and-vessel-disease
#5
Luigi E Pastormerlo, Stefano Maffei, Daniele Della Latta, Vladislav Chubuchny, Carla Susini, Sergio Berti, Concetta Prontera, Simona Storti, Claudio Passino, Emilio Pasanisi, Michele Emdin, Dante Chiappino
BACKGROUND: Identification of preclinical cardiovascular disease represents a challenge. We evaluate N-terminal proB-type natriuretic peptides (NT-proBNP) as markers of both cardiac and vascular subclinical disease in a community-based study including asymptomatic middle- aged study participants. METHODS AND RESULTS: In total, 807 study participants without previous cardiovascular disease were recruited. They underwent thorough laboratory assessment (including NT-proBNP), ultrasound examination of heart and evaluation of coronary calcium score and carotid intima-media thickness, by computed tomography and ultrasound, respectively...
March 16, 2017: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/28303473/incremental-role-of-resting-myocardial-computed-tomography-perfusion-for-predicting-physiologically-significant-coronary-artery-disease-a-machine-learning-approach
#6
Donghee Han, Ji Hyun Lee, Asim Rizvi, Heidi Gransar, Lohendran Baskaran, Joshua Schulman-Marcus, Bríain Ó Hartaigh, Fay Y Lin, James K Min
BACKGROUND: Evaluation of resting myocardial computed tomography perfusion (CTP) by coronary CT angiography (CCTA) might serve as a useful addition for determining coronary artery disease. We aimed to evaluate the incremental benefit of resting CTP over coronary stenosis for predicting ischemia using a computational algorithm trained by machine learning methods. METHODS: 252 patients underwent CCTA and invasive fractional flow reserve (FFR). CT stenosis was classified as 0%, 1-30%, 31-49%, 50-70%, and >70% maximal stenosis...
March 16, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28303063/a-case-report-of-idiopathic-iliopsoas-hematoma-which-occurred-soon-after-transfer-to-the-wheelchair-after-total-hip-arthroplasty
#7
Tomoo Okumura, Hiroshi Fujita, Hideto Harada, Ryuuichi Nishimura, Tomohiro Tominaga
A 79-year-old woman was diagnosed with osteoarthritis of the left hip and scheduled for total hip arthroplasty. As two lesions were detected in branches of the coronary arteries, she was treated with catheter treatment. The patient was receiving anticoagulant treatment, which was suspended eight days before the operation; however, heparin was started at 6 days before the operation and was stopped 9 hours before the operation. On the 2nd postoperative day soon after transfer to the wheel chair, she was feeling unwell and was suffering from severe pain in her left buttock and left thigh...
February 2017: Nagoya Journal of Medical Science
https://www.readbyqxmd.com/read/28302592/spectral-detector-ct-for-cardiovascular-applications
#8
Prabhakar Rajiah, Suhny Abbara, Sandra Simon Halliburton
Spectral detector computed tomography (SDCT) is a novel technology that uses two layers of detectors to simultaneously collect low and high energy data. Spectral data is used to generate conventional polyenergetic images as well as dedicated spectral images including virtual monoenergetic and material composition (iodine-only, virtual unenhanced, effective atomic number) images. This paper provides an overview of SDCT technology and a description of some spectral image types. The potential utility of SDCT for cardiovascular imaging and the impact of this new technology on radiation and contrast dose are discussed through presentation of initial patient studies performed on a SDCT scanner...
March 17, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28300293/coronary-artery-calcification-is-common-on-nongated-chest-computed-tomography-imaging
#9
Revathi Balakrishnan, Brian Nguyen, Roy Raad, Robert Donnino, David P Naidich, Jill E Jacobs, Harmony R Reynolds
BACKGROUND: Coronary artery calcification as assessed by computed tomography (CT) is a validated predictor of cardiovascular risk, whether identified on a dedicated cardiac study or on a routine non-gated chest CT. The prevalence of incidentally detected coronary artery calcification on non-gated chest CT imaging and consistency of reporting have not been well characterized. HYPOTHESIS: Coronary calcification is present on chest CT in some patients not taking statin therapy and may be under-reported...
March 16, 2017: Clinical Cardiology
https://www.readbyqxmd.com/read/28299238/erratum-syntax-score-in-patients-with-high-computed-tomography-coronary-calcium-score
#10
(no author information available yet)
[This corrects the article on p. 46 in vol. 6, PMID: 28028450.].
2017: Journal of Clinical Imaging Science
https://www.readbyqxmd.com/read/28296684/improved-discrimination-of-myocardial-perfusion-defects-at-low-energy-levels-using-virtual-monochromatic-imaging
#11
Patricia Carrascosa, Alejandro Deviggiano, Macarena de Zan, Carlos Capunay, Roxana Campisi, Gaston A Rodriguez-Granillo
OBJECTIVES: The aim of this study was to explore the diagnostic performance of dual-energy computed tomography perfusion (DE-CTP) at different energy levels. METHODS: Patients with known or suspected coronary artery disease underwent stress and rest DE-CTP and single-photon emission computed tomography. Images were evaluated using monochromatic data, and perfusion defects were initially identified in a qualitative manner and subsequently confirmed using attenuation levels...
March 15, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28296294/electrocardiogram-gated-coronary-ct-angiography-dose-estimates-using-impact
#12
Masanao Kobayashi, Yasuki Asada, Kosuke Matsubara, Shouichi Suzuki, Kichiro Koshida, Yuta Matsunaga, Tomonobu Haba, Ai Kawaguchi, Hiroshi Toyama, Ryoichi Kato
The primary study objective was to assess radiation doses using a modified form of the Imaging Performance Assessment of Computed Tomography (CT) scanner (ImPACT) patient dosimetry for cardiac applications on an Aquilion ONE ViSION Edition scanner, including the Ca score, target computed tomography angiography (CTA), prospective CTA, continuous CTA/cardiac function analysis (CFA), and CTA/CFA modulation. Accordingly, we clarified the CT dose index (CTDI) to determine the relationship between heart rate (HR) and X-ray exposure...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28295996/incidence-and-predictors-of-coronary-obstruction-following-transcatheter-aortic-valve-implantation-in-the-real-world
#13
Takahide Arai, Thierry Lefèvre, Thomas Hovasse, Philippe Garot, Hakim Benamer, Thierry Unterseeh, Andrew K Roy, Mauro Romano, Kentaro Hayashida, Yusuke Watanabe, Erik Bouvier, Marie-Claude Morice, Bernard Chevalier
OBJECTIVES: Coronary obstruction (CO) is a rare but serious complication of transcatheter aortic valve implantation (TAVI). There are very limited data regarding CO following TAVI. The aim of this study was to evaluate the incidence and outcomes of CO after TAVI and identify the predictors including the valve type. METHODS: Between October 2006 and March 2015, 1,203 TAVI cases were performed in our institution. Of them, 814 cases whose coronary height was measured using computed tomography for screening were analyzed in this study...
March 15, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28295517/a-giant-aneurysm-of-noncoronary-sinus-of-valsalva-concomitant-with-aortic-regurgitation-and-mitral-regurgitation
#14
Yi Luo, Zhi Fang, Wei Meng
Aneurysms of the sinus of Valsalva (ASV) are rare, with an incidence ranging from 0.1% to 3.5% of all congenital cardiac defects and a prevalence of 0.009% in an autopsy series.ASVs occur much more frequently in the right coronary sinus of Valsalva. Previous reports, based on necropsy and cardiac surgery findings, estimated that 20% of ASVs are unruptured. Patients with an unruptured ASV may remain asymptomatic for a long period of time until rupture. They may also presented with dyspnea, palpitation, and angina-like chest pain...
March 14, 2017: Echocardiography
https://www.readbyqxmd.com/read/28294853/-interrelation-of-electrophysiological-and-perfusion-changes-in-patients-with-left-ventricular-aneurysm
#15
V E Babokin, V M Shipulin, S M Minin, R E Batalov, S S Gutor, U B Lishmanov, S V Popov, V N Ilyinov, S L Andreev, R S Karpov
The study was aimed at identification of relations between perfusion and electrophysiological changes in left ventricular (LV) myocardium in patients with ischemic heart disease (IHD) with postinfarction LV aneurysm and ventricular tachycardia. The study enrolled 23 patients with the aforementioned disease. Preoperatively, apart from standard clinical examination of cardiosurgical patients, intracardiac electrophysiological study and perfusion single-photon emission computed tomography of myocardium with 99mTc-Technetril were performed...
April 2016: Kardiologiia
https://www.readbyqxmd.com/read/28293007/-dual-left-anterior-descending-coronary-artery-report-of-a-case
#16
Soujiro Amamoto, Masaru Yoshikai, Takahiro Miho, Kiyokazu Koga
A 77-year-old male presented with angina pectoris. On coronary angiography, the left anterior descending artery(LAD) was obstructed after branching the second septal branch. Three-dimensional (3D) images constructed with 64-slice computed tomography (CT) showed type I dual LAD. The short LAD, which had been erroneously recognized as a septal branch on coronary angiography, ran on the anterior interventricular sulcus (AIVS) where it then terminated. The long LAD, which was obstructed at its origin, ran on the left ventricular side of the AIVS, and entered the distal part of the AIVS...
March 2017: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/28293003/-surgical-repair-of-coronary-pulmonary-artery-fistulae-with-giant-coronary-aneurysm
#17
Naoki Hashiyama, Yusuke Katayama, Makoto Mo, Munetaka Masuda
A 69-year-old woman was referred to our hospital due to dyspnea on exertion and a heart murmur. A chest X-ray showed a bulge at the left 3rd arch and chest computed tomography( CT) revealed a giant mass adjacent to the right ventricular outflow. Multidetector-row CT and coronary angiography showed a giant coronary aneurysm (55×45 mm) and fistulae arising from the left main coronary trunk and entering into the main pulmonary artery (PA). The pulmonary to systemic flow ratio was 1.84. She was diagnosed with coronary-pulmonary artery fistulae with giant coronary aneurysm...
March 2017: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/28292858/predictive-value-of-age-and-sex-specific-nomograms-of-global-plaque-burden-on-coronary-computed-tomography-angiography-for-major-cardiac-events
#18
Christopher Naoum, Daniel S Berman, Amir Ahmadi, Philipp Blanke, Heidi Gransar, Jagat Narula, Leslee J Shaw, Leonard Kritharides, Stephan Achenbach, Mouaz H Al-Mallah, Daniele Andreini, Matthew J Budoff, Filippo Cademartiri, Tracy Q Callister, Hyuk-Jae Chang, Kavitha Chinnaiyan, Benjamin Chow, Ricardo C Cury, Augustin DeLago, Allison Dunning, Gudrun Feuchtner, Martin Hadamitzky, Joerg Hausleiter, Philipp A Kaufmann, Yong-Jin Kim, Erica Maffei, Hugo Marquez, Gianluca Pontone, Gilbert Raff, Ronen Rubinshtein, Todd C Villines, James Min, Jonathon Leipsic
BACKGROUND: Age-adjusted coronary artery disease (CAD) burden identified on coronary computed tomography angiography predicts major adverse cardiovascular event (MACE) risk; however, it seldom contributes to clinical decision making because of a lack of nomographic data. We aimed to develop clinically pragmatic age- and sex-specific nomograms of CAD burden using coronary computed tomography angiography and to validate their prognostic use. METHODS AND RESULTS: Patients prospectively enrolled in phase I of the CONFIRM registry (Coronary CT Angiography Evaluation for Clinical Outcomes) were included (derivation cohort: n=21,132; 46% female) to develop CAD nomograms based on age-sex percentiles of segment involvement score (SIS) at each year of life (40-79 years)...
March 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28291663/acc-aats-aha-ase-asnc-scai-scct-sts-2017-appropriate-use-criteria-for-coronary-revascularization-in-patients-with%C3%A2-stable-ischemic-heart%C3%A2-disease-a-report-of-the-american-college-of-cardiology-appropriate-use-criteria-task-force-american-association-for-thoracic
#19
https://www.readbyqxmd.com/read/28290832/-computed-tomography-in-the-evaluation-of-coronary-atherosclerotic-plaques-comparison-with-intravascular-ultrasound
#20
T N Veselova, M S Shabanova, V M Mironov, I N Merkulova, S K Ternovoy
PURPOSE: Determination of computed tomography angiography (CTA) informativeness in assessment of state of atherosclerotic coronary plaque (ACP) and identification of signs of its instability compared with intravascular ultrasound (IVUS). MATERIALS AND METHODS: Coronary CTA was carried out in 52 patients with clinical presentation of non-ST elevation (NSTE) acute coronary syndrome on the first day of hospitalization. ACPs were identified in 32 of 52 patients (61...
January 2017: Kardiologiia
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