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Cardiovascular MRI

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https://www.readbyqxmd.com/read/29053451/spatially-resolved-mr-compatible-doppler-ultrasound-proof-of-concept-for-triggering-of-diagnostic-quality-cardiovascular-mri-for-function-and-flow-quantification-at-3t
#1
Lindsey A Crowe, Gibran Manasseh, Aneta Chmielewski, Anne-Lise Hachulla, Daniel Speicher, Andreas Greiser, Hajo Muller, Thomas De Perrot, Jean-Paul Vallee, Rares Salomir
OBJECTIVES: We demonstrate the use of a Magnetic-Resonance (MR)-compatible ultrasound (US) imaging probe using spatially-resolved Doppler for diagnostic quality cardiovascular MR imaging as an initial step towards hybrid US/MR fetal imaging. METHODS: A newly developed technology for a dedicated MR-compatible phased array ultrasound-imaging probe acquired pulsed color Doppler carotid images, which were converted in near-real time to a trigger signal for cardiac cine and flow quantification MRI...
October 17, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/29051544/estimating-prognosis-in-patients-with-acute-myocardial-infarction-using-personalized-computational-heart-models
#2
Hao Gao, Kenneth Mangion, David Carrick, Dirk Husmeier, Xiaoyu Luo, Colin Berry
Biomechanical computational models have potential prognostic utility in patients after an acute ST-segment-elevation myocardial infarction (STEMI). In a proof-of-concept study, we defined two groups (1) an acute STEMI group (n = 6, 83% male, age 54 ± 12 years) complicated by left ventricular (LV) systolic dysfunction; (2) an age- and sex- matched hyper-control group (n = 6, 83% male, age 46 ± 14 years), no prior history of cardiovascular disease and normal systolic blood pressure (SBP < 130 mmHg)...
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29045977/-clinical-and-genetic-characteristics-of-williams-beuren-syndrome-2-cases-report
#3
S Q Wang, Z X Yang, H Li
To explore the clinical and genetic characteristics of Williams-Beuren syndrome (WBS) and to raise awareness of the disease. The characteristics of clinical manifestations, personal history, cardiac ultrasound, brain magnetic resonance imaging (MRI), electroencephalogram (EEG) and chromosome detection results of two cases with WBS were analyzed. The two patients were both male and the age was 11 months and 1 day, and 9 months and 9 days, respectively. They both suffered from cardiovascular malformation: case one presented supravalvular aortic stenosis, and case two showed atrial septal defect and patent ductus arteriosus...
October 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29037199/assessment-of-local-pulse-wave-velocity-distribution-in-mice-using-k-t-blast-pc-cmr-with-semi-automatic-area-segmentation
#4
Volker Herold, Stefan Herz, Patrick Winter, Fabian Tobias Gutjahr, Kristina Andelovic, Wolfgang Rudolf Bauer, Peter Michael Jakob
BACKGROUND: Local aortic pulse wave velocity (PWV) is a measure for vascular stiffness and has a predictive value for cardiovascular events. Ultra high field CMR scanners allow the quantification of local PWV in mice, however these systems are yet unable to monitor the distribution of local elasticities. METHODS: In the present study we provide a new accelerated method to quantify local aortic PWV in mice with phase-contrast cardiovascular magnetic resonance imaging (PC-CMR) at 17...
October 16, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29033829/exercise-training-increases-parietal-lobe-cerebral-blood-flow-in-chronic-stroke-an-observational-study
#5
Andrew D Robertson, Susan Marzolini, Laura E Middleton, Vincenzo S Basile, Paul I Oh, Bradley J MacIntosh
Exercise is increasingly recommended as an essential component of stroke rehabilitation, yet uncertainty remains with respect to its direct effect on the cerebral vasculature. The current study first demonstrated the repeatability of pseudo-continuous arterial spin labeling (ASL) magnetic resonance imaging (MRI) in older adults with stroke, and then investigated the change in cerebrovascular function following a 6-month cardiovascular rehabilitation program. In the repeatability study, 12 participants at least 3 months post-stroke underwent two ASL imaging scans 1 month apart...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29026416/right-ventricular-thrombosis-as-a-manifestation-of-beh%C3%A3-et-s-syndrome
#6
Payam Ebrahimifar, Javad Shahabi
BACKGROUND: Behçet's disease (BD) is a rare condition with a classic triad of oral and genital ulceration and eye disease. Cardiovascular complication is a rare finding in BD. CASE REPORT: In this report, we present a seventeen years old patient with a history of fever for 20 days, who developed a clot in right ventricle (RV). Cardiac magnetic resonance imaging (MRI) and echocardiography demonstrated a thrombosis in RV and a thoracic multi detector computed tomographic image showed pulmonary thromboembolism (PTE) in patient...
March 2017: ARYA Atherosclerosis
https://www.readbyqxmd.com/read/29023983/age-vascular-health-and-alzheimer-s-disease-biomarkers-in-an-elderly-sample
#7
Prashanthi Vemuri, Timothy G Lesnick, Scott A Przybelski, David S Knopman, Val J Lowe, Jonathan Graff-Radford, Rosebud O Roberts, Michelle M Mielke, Mary M Machulda, Ronald C Petersen, Clifford R Jack
OBJECTIVE: To investigate the associations between age, vascular health, and Alzheimer's disease (AD) imaging biomarkers in an elderly sample. METHODS: We identified 430 individuals along the cognitive continuum aged>60 years with amyloid-PET, Tau-PET, and MRI scans from the population-based Mayo Clinic Study of Aging. A subset of 329 individuals had FDG-PET. We ascertained presently existing cardiovascular and metabolic conditions (CMC) from healthcare records and used the summation of presence/absence of hypertension, hyperlipidemia, cardiac-arrhythmias, coronary artery disease, congestive heart failure, diabetes mellitus, and stroke as a surrogate for vascular health...
October 10, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/29017630/poor-perinatal-growth-impairs-baboon-aortic-windkessel-function
#8
A H Kuo, J Li, C Li, H F Huber, P W Nathanielsz, G D Clarke
The ability of the aorta to buffer blood flow and provide diastolic perfusion (Windkessel function) is a determinant of cardiovascular health. We have reported cardiac dysfunction indicating downstream vascular abnormalities in young adult baboons who were intrauterine growth restricted (IUGR) at birth as a result of moderate maternal nutrient reduction. Using 3 T MRI, we examined IUGR offspring (eight male, eight female; 5.7 years; human equivalent 25 years) and age-matched controls (eight male, eight female; 5...
October 11, 2017: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/29017156/the-missing-link-in-the-pathophysiology-of-vascular-cognitive-impairment-design-of-the-heart-brain-study
#9
Astrid M Hooghiemstra, Anne Suzanne Bertens, Anna E Leeuwis, Esther E Bron, Michiel L Bots, Hans-Peter Brunner-La Rocca, Anton J M de Craen, Rob J van der Geest, Jacoba P Greving, L Jaap Kappelle, Wiro J Niessen, Robert J van Oostenbrugge, Matthias J P van Osch, Albert de Roos, Albert C van Rossum, Geert Jan Biessels, Mark A van Buchem, Mat J A P Daemen, Wiesje M van der Flier
BACKGROUND: Hemodynamic balance in the heart-brain axis is increasingly recognized as a crucial factor in maintaining functional and structural integrity of the brain and thereby cognitive functioning. Patients with heart failure (HF), carotid occlusive disease (COD), and vascular cognitive impairment (VCI) present themselves with complaints attributed to specific parts of the heart-brain axis, but hemodynamic changes often go beyond the part of the axis for which they primarily seek medical advice...
October 10, 2017: Cerebrovascular Diseases Extra
https://www.readbyqxmd.com/read/29016776/atrial-fibrillation-is-associated-with-decreased-total-cerebral-blood-flow-and-brain-perfusion
#10
Marianna Gardarsdottir, Sigurdur Sigurdsson, Thor Aspelund, Hrafnhildur Rokita, Lenore J Launer, Vilmundur Gudnason, David O Arnar
Aims: Atrial fibrillation (AF) has been associated with cognitive impairment. Additionally, brain volume may be reduced in individuals with AF. Potential causes may include cerebral micro-embolism or reduced stroke volume due to the beat-to-beat variation in AF. The aims of this study were to measure cerebral blood flow and estimate whole brain perfusion in elderly individuals with and without AF. Methods and results: Blood flow in the cervical arteries was measured with phase contrast MRI and brain perfusion estimated in a large cohort from the AGES-Reykjavik Study...
August 9, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29016766/temporal-pattern-episode-duration-based-classification-of-atrial-fibrillation-as-paroxysmal-vs-persistent-is-it-time-to-develop-a-more-integrated-prognostic-score-to-optimize-management
#11
Matthew Hammond-Haley, Rui Providência, Pier D Lambiase
Atrial fibrillation (AF) is a clinically heterogeneous arrhythmia that is currently classified according to the variety of temporal rhythm based manifestations observed clinically, including 'first detected episode', 'paroxysmal', 'persistent', or 'permanent' AF. Despite being widely adopted by the most recent consensus guidelines, the utility of this classification system to stratify patients into distinct and clinically useful groups that have different outcomes including mortality, morbidity, specific cardiovascular outcomes, and quality of life (QoL), remains questionable...
July 11, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28994865/value-of-cine-mri-sequences-before-and-after-injection-in-the-diagnosis-of-acute-myocarditis
#12
Asma Zidi, Ihsen Zairi, Khadija Mzoughi, Lilia Zakhama, Ikram Kamoun, Afef Ben Halima, Imen Ridene
BACKGROUND: Cardiovascular magnetic resonance (CMR) has become the examination of choice in case of suspicion of acute myocarditis. Late gadolinium enhancement (LGE) imaging is very important to establish this diagnosis. Cine MRI sequences are useful for the study of the myocardial contractility. AIMS:   The purpose is to estimate the value of cine MRI sequences before and after injection for the diagnosis of acute myocarditis compared with late gadolinium enhanced sequences...
November 2016: La Tunisie Médicale
https://www.readbyqxmd.com/read/28981438/filtering-of-ecg-signals-distorted-by-magnetic-field-gradients-during-mri-using-non-linear-filters-and-higher-order-statistics
#13
Marcus Schmidt, Johannes W Krug, Michael N Rosenheimer, Georg Rose
The electrocardiogram (ECG) is the state-of-the-art signal for patient monitoring and gating in cardiovascular magnetic resonance (CMR) imaging applications. However, ECG signals are severely distorted during MRI scans due to the effects of static magnetic fields, radio frequency pulses and fast-switching gradient magnetic fields. Gradient-induced artifacts that cause high frequency peaks in the ECG signal especially hamper a correct and reliable QRS detection. To cope with this problem, a new median-based real-time gradient filter (M1) approach was developed...
June 5, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28981141/brain-and-heart-magnetic-resonance-imaging-spectroscopy-in-duchenne-muscular-dystrophy
#14
REVIEW
Sophie Mavrogeni, Roser Pons, Ioannis Nikas, George Papadopoulos, Dimitrios A Verganelakis, Genovefa Kolovou, George P Chrousos
Duchenne muscular dystrophy (DMD) is an X-linked muscle disorder characterized by progressive and irreversible loss of muscular function. As muscular disease progresses, the repair mechanisms cannot compensate for cellular damage, leading inevitably to necrosis and progressive replacement by fibrous and fatty tissue. Cardiomyopathy and respiratory failure are the main causes of death in DMD. In addition to the well-described muscle and heart disease, cognitive dysfunction affects around 30% of DMD boys. Myocardial fibrosis, assessed by late gadolinium enhancement (LGE), using cardiovascular magnetic resonance imaging (CMR), is an early marker of heart involvement in both DMD patients and female carriers...
October 5, 2017: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28975024/quantification-of-pulmonary-regurgitation-in-patients-with-repaired-tetralogy-of-fallot-by-2d-phase-contrast-mri-differences-between-the-standard-method-of-velocity-averaging-and-a-pixel-wise-analysis
#15
Julio Sotelo, Pablo Bächler, Jesús Urbina, Gerard Crelier, Lida Toro, Myriam Ferreiro, Israel Valverde, Marcelo Andia, Cristian Tejos, Pablo Irarrazaval, Sergio Uribe
OBJECTIVES: To compare the values of pulmonary regurgitation in patients with repaired Tetralogy of Fallot quantified from two-dimensional phase-contrast data, by using a new pixel-wise analysis and the standard velocity-averaging method. DESIGN: Quantitative in silico and in vivo analysis. SETTING: Hospital Sótero del Río. The magnetic resonance images were acquired using a Philips Achieva 1.5T scanner. PARTICIPANTS: Twenty-five patients with repaired Tetralogy of Fallot who underwent cardiovascular magnetic resonance imaging requested by their referring physicians were included in this study...
January 2017: JRSM Cardiovascular Disease
https://www.readbyqxmd.com/read/28974742/the-relative-contribution-of-metabolic-and-structural-abnormalities-to-diastolic-dysfunction-in-obesity
#16
J J Rayner, R Banerjee, C J Holloway, A J M Lewis, M A Peterzan, J M Francis, S Neubauer, O J Rider
BACKGROUND: Obesity causes diastolic dysfunction, and is one of the leading causes of heart failure with preserved ejection fraction. Myocardial relaxation is determined by both active metabolic processes such as impaired energetic status and steatosis, as well as intrinsic myocardial remodelling. However, the relative contribution of each to diastolic dysfunction in obesity is currently unknown. METHODS: 80 adult subjects (48 male) with no cardiovascular risk factors across a wide range of body mass indices (18...
October 4, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28967613/relationship-of-serum-leptin-with-some-biochemical-anthropometric-parameters-and-abdominal-fat-volumes-as-measured-by-magnetic-resonance-imaging
#17
Nawal S Hijjawi, Ali M Al-Radaideh, Kholoud I Al-Fayomi, Nisreen A Nimer, Hadeel A Alabadi, Rana M Al-Zu'bi, Lana M Agraib, Sabika S Allehdan, Reema F Tayyem
AIMS: To measure the level of leptin in volunteers and correlate it with several anthropometric, biochemical variables and abdominal fat volumes. METHODS: The level of leptin was investigated in 167 disease-free volunteers. Serum levels of IL-6, adiponectin, and resistin, blood lipid profile (cholesterol, low-density lipoprotein (LDL), high-density lipoprotein (HDL), and triglyceride (TG) were determined. Waist circumference (WC) was measured using tape and magnetic resonance imaging (MRI) images...
September 22, 2017: Diabetes & Metabolic Syndrome
https://www.readbyqxmd.com/read/28965668/hemorrhagic-infarct-of-basal-ganglia-in-cardiac-arrest-ct-and-mri-findings-2-cases
#18
Monique Boukobza, Frédéric J Baud
We report the CT and MRI findings in two cases of hemorrhagic infarct of the basal ganglia (BG), following out-of-hospital cardiac arrest (CA). In case 1, Brain-CT realized at day 2 showed bilateral and almost symmetric hemorrhagic infarct of the BG and infarct of the tectum of the mesencephalon. In case 2, MRI realized at day 6 showed hemorrhagic infarct of both lenticular nuclei on T2 GE images. In both cases there was no medical history and the cardiovascular and the coagulation profile were normal. In these cases, the lesions are observed earlier than reported in a few previous radiological cases...
September 21, 2017: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/28956200/magnetic-resonance-guided-renal-denervation-using-active-tracking-first-in-vivo-experience-in-swine
#19
F Bönner, S Haberkorn, P Behm, B Schnackenburg, S Krüger, S Weiss, C Meyer, M Kelm, M Neizel-Wittke
Interventional cardiovascular magnetic resonance (iCMR) might evolve as a technique to improve procedural success rates in cardiovascular interventions by combining intraprocedural guidance and simultaneous lesion imaging. The objective of the present study was to prove feasibility and estimate safety of renal sympathetic denervation guided by real-time iCMR using active tracking. Six pigs were examined in a 1.5 T MRI-System (Achieva, Philips Healthcare, Best, Netherlands) equipped with non-invasive hemodynamic control and in-room monitors displaying an interventional software platform [Interventional MRI Suite (iSuite), Philips Research, Hamburg, Germany]...
September 27, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28950314/prognostic-impact-of-unrecognized-myocardial-scar-in-the-non-culprit-territories-by-cardiac-magnetic-resonance-imaging-in-patients-with-acute-myocardial-infarction
#20
Taku Omori, Tairo Kurita, Kaoru Dohi, Akihiro Takasaki, Tomoyuki Nakata, Shiro Nakamori, Naoki Fujimoto, Kakuya Kitagawa, Kozo Hoshino, Takashi Tanigawa, Hajime Sakuma, Masaaki Ito
Aims: Unrecognized myocardial scar by late gadolinium enhancement (LGE) magnetic resonance imaging (MRI) is strongly associated with cardiac event in patients with stable coronary artery disease. The purpose of this study was to evaluate the prognostic impact of unrecognized non-infarct-related LGE (non-IR-LGE) in patients with acute myocardial infarction (AMI). Methods and results: We studied 269 patients with a first clinical episode of AMI underwent cardiac MRI within 6 weeks after onset (209 men; age, 66 ± 12 years)...
July 27, 2017: European Heart Journal Cardiovascular Imaging
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