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https://www.readbyqxmd.com/read/29148586/a-dynamic-ultrasound-simulation-of-a-pulsating-three-layered-cca-for-validation-of-2d-wall-motion-and-blood-velocity-estimation-algorithms
#1
Xiao Hu, Yufeng Zhang, Guanghui Cai, Kexin Zhang, Li Deng, Lian Gao, Suya Han, Jianhua Chen
PURPOSE: A dynamic ultrasound simulation model for the common carotid artery (CCA) with three arterial layers for validation of 2D wall motion and blood velocity estimation algorithms is proposed in present study. This model describes layers with not only characteristics of echo distributions conforming to clinical ones, but also varying thicknesses, axial and radial displacements with pulsatile blood pressure during a cardiac cycle. METHODS: The modeling process is as follows: first, a geometrical model according with the clinical structure size of a CCA is built based on the preset layer thicknesses and the diameter of lumen...
November 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/29147633/a-unique-case-of-carotid-splaying-by-a-cervical-vagal-neurofibroma-and-the-role-of-neuroradiology-in-surgical-management
#2
Sally A Itawi, Mark Buehler, Robert E Mrak, Tarek R Mansour, Yacine Medhkour, Azedine Medhkour
Carotid splaying, also known as the Lyre sign, is a widening of the carotid bifurcation due to the displacement of the internal carotid artery and the external carotid artery just distal to the point of divergence. This phenomenon is classically exhibited by highly vascularized carotid body tumors and, in rare cases, by cervical sympathetic chain schwannomas. Demonstration of the Lyre sign by a cervical vagal neurofibroma, however, is a unique occurrence that has not been previously documented in the literature...
September 7, 2017: Curēus
https://www.readbyqxmd.com/read/29147596/carotidynia-a-rare-diagnosis-for-unilateral-neck-pain-revealed-by-cross-sectional-imaging
#3
Corrado Santarosa, Salvatore Stefanelli, Roman Sztajzel, Pravin Mundada, Minerva Becker
Idiopathic carotidynia (IC) is a rare and poorly understood syndrome consisting of unilateral neck pain, tenderness, and increased pulsations over the affected carotid bifurcation. A growing body of evidence supports the hypothesis that IC is a distinct clinicopathologic entity with characteristic imaging features. We report the case of a 34-year-old Caucasian male presenting with intense unilateral neck pain in the emergency setting. Computed tomography and ultrasonography revealed fusiform eccentric thickening of the ipsilateral carotid bifurcation without vessel narrowing...
2017: Case Reports in Radiology
https://www.readbyqxmd.com/read/29146829/is-bridging-therapy-still-required-in-stroke-due-to-carotid-artery-terminus-occlusions
#4
Romain Bourcier, Pierre-Louis Alexandre, François Eugène, Béatrice Delasalle-Guyomarch, Benoit Guillon, Basile Kerleroux, Suzana Saleme, Gaultier Marnat, Samy Boucebci, Mahmood Mirza, Jean-Christophe Ferré, Chrysanthi Papagiannaki, Hubert Desal
INTRODUCTION: Studies comparing endovascular stroke treatment using mechanical thrombectomy (MT) with or without prior IV tissue plasminogen activator (tPa) have included only 30% of internal carotid artery terminus occlusions (ICA-O), a known predictor of recanalization failure with IV tPa. OBJECTIVE: To carry out a retrospective multicenter analysis of prospectively collected data of consecutive patients to investigate the impact of intravenous thrombolysis on ICA-O by comparing patients treated with MT alone or bridging therapy (BT)...
November 16, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29146719/can-arterial-spin-labeling-with-multiple-postlabeling-delays-predict-cerebrovascular-reserve
#5
H J Choi, C-H Sohn, S-H You, R-E Yoo, K M Kang, T J Yun, S H Choi, J-H Kim, W-S Cho, J E Kim
BACKGROUND AND PURPOSE: The effect of delayed transit time is the main source of error in the quantitative measurement of CBF in arterial spin-labeling. In the present study, we evaluated the usefulness of the transit time-corrected CBF and arterial transit time delay from multiple postlabeling delays arterial spin-labeling compared with basal/acetazolamide stress technetium Tc99m-hexamethylpropylene amineoxime (Tc99m-HMPAO) SPECT in predicting impairment in the cerebrovascular reserve...
November 16, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29142623/simple-coiling-versus-stent-assisted-coiling-of-paraclinoid-aneurysms-radiological-outcome-in-a-single-center-study
#6
Soo Yeon Kim, Dong Sun Park, Hye Yin Park, Young Il Chun, Chang Taek Moon, Hong Gee Roh
Objective: Paraclinoid aneurysms are a group of aneurysms arising at the distal internal carotid artery. Due to a high incidence of small, wide-necked aneurysms in this zone, it is often challenging to achieve complete occlusion when solely using detachable coils, thus stent placement is often required. In the present study, we aimed to investigate the effect of stent placement in endovascular treatment of paraclinoid aneurysms. Methods: Data of 98 paraclinoid aneurysms treated by endovascular approach in our center from August 2005 to June 2016 were retrospectively reviewed...
November 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/29137053/prognostic-value-of-high-resolution-magnetic-resonance-imaging-in-evaluating-carotid-atherosclerotic-plaque-in-patients-with-ischemic-stroke
#7
Jin-Er Shu, Ming-Liang Ying, Xiao-Rong Chen, Jian-Jun Hua, Jie-Ting Fu, Xiu-Mei Xia, Yong-Hao Pan, Yang Jiang
BACKGROUND: Ischemic stroke (IS) is a devastating occurrence affecting millions worldwide. This study aimed to evaluate the prognostic value of high-resolution magnetic resonance imaging (HRMRI) in assessing carotid atherosclerotic plaque in IS patients. METHODS: Between January 2013 and March 2015, 338 IS patients were recruited for the investigative purposes of the study. All participants of the study underwent an HRMRI inspection procedure after being admitted into the hospital...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29134169/age-and-tumor-volume-predict-growth-of-carotid-and-vagal-body-paragangliomas
#8
Berdine L Heesterman, Lisa M H de Pont, Berit M Verbist, Andel G L van der Mey, Eleonora P M Corssmit, Frederik J Hes, Peter Paul G van Benthem, Jeroen C Jansen
Objective  Treatment for head and neck paragangliomas (HNGPL) can be more harmful than the disease. After diagnosis, an initial period of surveillance is often indicated, and surgery or radiotherapy is reserved for progressive disease. With the aim to optimize this "wait and scan" strategy, we studied growth and possible predictors. Design  A retrospective cohort study was conducted. Setting  This study was conducted at a tertiary referral center for patients with HNGPL. Methods  Tumor volume was estimated for 184 SDHD -related carotid and vagal body paragangliomas using sequential magnetic resonance imaging...
December 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/29132196/carotid-endarterectomy-the-change-in-practice-over-11%C3%A2-years-in-a-stroke-centre
#9
Gabrielle T W Tse, Monique F Kilkenny, Chris Bladin, Michael Grigg, Helen M Dewey
BACKGROUND: Recent research evidence has impacted the practice of carotid endarterectomy (CEA). We aim to characterize changes in the practice and outcome of CEA over time in a single large-volume stroke centre. METHODS: All patients who underwent CEA from 2004 to 2014 and carotid angioplasty and stenting (CAS) from 2003 to 2008 at an Australian metropolitan tertiary stroke centre hospital were included. Clinical data were analysed to identify time trends in choice of intervention, patient selection, preoperative imaging utilization, surgical timing and outcome...
November 13, 2017: ANZ Journal of Surgery
https://www.readbyqxmd.com/read/29132058/clinical-significance-of-the-coexistence-of-carotid-artery-plaque-and-white-matter-disease-in-patients-with-symptomatic-cerebral-infarction
#10
Mami Ishikawa, Hitoshi Sugawara, Toshiyuki Tsuji, Mutsumi Nagai, Gen Kusaka, Heiji Naritaka
OBJECTIVES: Symptomatic cerebral infarction (CI) can occur in patients without main cerebral artery stenosis or occlusion. This study investigated the unique features of carotid artery plaque and white matter disease (WMD) in patients with symptomatic CI and transient ischemic attack (TIA) but without stenosis or occlusion of a main cerebral artery. PATIENTS AND METHODS: We studied 647 patients who underwent both carotid ultrasound examination and brain magnetic resonance images...
December 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29131823/prevalence-of-extracranial-carotid-artery-aneurysms-in-patients-with-an-intracranial-aneurysm
#11
V E C Pourier, C J H C M van Laarhoven, M D I Vergouwen, G J E Rinkel, Gert J de Borst
BACKGROUND AND PURPOSE: Aneurysms in various arterial beds have common risk- and genetic factors. Data on the correlation of extracranial carotid artery aneurysms (ECAA) with aneurysms in other vascular territories are lacking. We aimed to investigate the prevalence of ECAA in patients with an intracranial aneurysm (IA). METHODS: We used prospectively collected databases of consecutive patients registered at the University Medical Center Utrecht with an unruptured intracranial aneurysm (UIA) or aneurysmal Subarachnoid hemorrhage (SAH)...
2017: PloS One
https://www.readbyqxmd.com/read/29124548/development-of-an-experimental-and-digital-cardiovascular-arterial-model-for-transient-hemodynamic-and-postural-change-studies-a-preliminary-framework-analysis
#12
Rodward L Hewlin, John P Kizito
The ultimate goal of the present work is to aid in the development of tools to assist in the treatment of cardiovascular disease. Gaining an understanding of hemodynamic parameters for medical implants allow clinicians to have some patient-specific proposals for intervention planning. In the present work an experimental and digital computational fluid dynamics (CFD) arterial model consisting of a number of major arteries (aorta, carotid bifurcation, cranial, femoral, jejunal, and subclavian arteries) were fabricated to study: (1) the effects of local hemodynamics (flow parameters) on global hemodynamics (2) the effects of transition from bedrest to upright position (postural change) on hemodynamics, and (3) diffusion of dye (medical drug diffusion simulation) in the arterial system via experimental and numerical techniques...
November 9, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/29124105/measuring-brain-synaptic-vesicle-protein-2a-with-positron-emission-tomography-and-18-f-ucb-h
#13
Mohamed Ali Bahri, Alain Plenevaux, Joël Aerts, Christine Bastin, Guillaume Becker, Joël Mercier, Anne Valade, Tim Buchanan, Nathalie Mestdagh, Didier Ledoux, Alain Seret, André Luxen, Eric Salmon
Introduction: Brain distribution of synaptic vesicle protein 2A was measured with fluorine-18 UCB-H ([(18)F]UCB-H) and positron emission tomography (PET). Methods: Images of synaptic density were acquired in healthy volunteers (two young participants and two seniors). Input function was measured by arterial blood sampling (arterial input function) and derived from PET images using carotid activity (image-derived input function). Logan graphical analysis was used to estimate regional synaptic vesicle protein 2A distribution volume...
November 2017: Alzheimer's & Dementia: Translational Research & Clinical Interventions
https://www.readbyqxmd.com/read/29123849/a-case-report-of-systemic-embolic-events-associated-with-atrial-fibrillation
#14
Hidehiko Nakano, Hiroshi Yamagami, Hisashi Ofuchi
Case: An 82-year-old woman who had atrial fibrillation was found unconscious and was brought to the emergency department by ambulance. Her Glasgow Coma Scale score was 3, and an electrocardiogram showed ST segment elevation in V3 and V4. Cardiac ultrasonography showed left ventricular asynergy in the anterior wall, septum, and apex. Although dissection of the aorta was suspected, contrast computed tomography showed multiple arterial thromboses, including bilateral common carotid arteries and poor contrast in the left ventricle...
January 2017: Acute Medicine & Surgery
https://www.readbyqxmd.com/read/29121596/the-impact-of-long-term-moderate-and-heavy-alcohol-consumption-on-incident-atherosclerosis-among-persons-living-with-hiv
#15
N E Kelso-Chichetto, M Plankey, D S Sheps, A G Abraham, X Chen, S Shoptaw, R C Kaplan, W S Post, R L Cook
BACKGROUND: Level of alcohol consumption is associated with differential risk of atherosclerosis, but little research has investigated this association among HIV+ persons. We evaluated the association between long-term alcohol use and incident atherosclerosis among HIV+ persons. METHODS: We utilized data from HIV+ participants of the Women's Interagency HIV Study (n=483) and the Multicenter AIDS Cohort Study (n=305) without history of cardiovascular disease. Atherosclerosis was assessed two times by B-mode carotid artery ultrasound imaging from 2004 to 2013...
October 28, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/29120867/quantifying-the-ultrastructure-of-carotid-arteries-using-high-resolution-micro-diffusion-tensor-imaging-comparison-of-intact-versus-open-cut-tissue
#16
Syed Salman Shahid, Robert T Gaul, Christian Kerskens, Vittoria Flamini, Caitríona Lally
Diffusion magnetic resonance imaging (dMRI) can provide insights into the microstructure of intact arterial tissue. The current study employed high magnetic field MRI to obtain ultra-high resolution dMRI at an isotropic voxel resolution of 117 µm(3) in less than 2 h of scan time. A parameter selective single shell (128 directions) diffusion-encoding scheme based on Stejskel-Tanner sequence with echo-planar imaging (EPI) readout was used. EPI segmentation was used to reduce the echo time (TE) and to minimise the susceptibility-induced artefacts...
November 9, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29118798/internal-carotid-artery-and-the-proximal-m1-segment-are-optimal-targets-for-mechanical-thrombectomy
#17
Niko Sillanpää, Sara Protto, Jukka T Saarinen, Juha-Pekka Pienimäki, Janne Seppänen, Heikki Numminen, Harri Rusanen
Background and Purpose: Mechanical thrombectomy (MT) is an established treatment of acute anterior circulation stroke caused by large vessel occlusion (LVO). We compared the clinical outcome (3-month modified Rankin Scale, mRS) in hyperacute (<3h from the onset of symptoms) ischemic stroke between an MT and an intravenous thrombolysis (IVT) cohort in proximal (ICA and the proximal M1 segment of the middle cerebral artery) and distal (the distal M1 and the M2 segment) LVOs. Methods: We prospectively reviewed 67 patients who underwent MT with newer-generation stent retrievers...
October 2017: Interventional Neurology
https://www.readbyqxmd.com/read/29117484/carotid-intraplaque-hemorrhage-imaging-with-quantitative-vessel-wall-t1-mapping-technical-development-and-initial-experience
#18
Haikun Qi, Jie Sun, Huiyu Qiao, Shuo Chen, Zechen Zhou, Xinlei Pan, Yishi Wang, Xihai Zhao, Rui Li, Chun Yuan, Huijun Chen
Purpose To develop a three-dimensional (3D) high-spatial-resolution time-efficient sequence for use in quantitative vessel wall T1 mapping. Materials and Methods A previously described sequence, simultaneous noncontrast angiography and intraplaque hemorrhage (SNAP) imaging, was extended by introducing 3D golden angle radial k-space sampling (GOAL-SNAP). Sliding window reconstruction was adopted to reconstruct images at different inversion delay times (different T1 contrasts) for voxelwise T1 fitting. Phantom studies were performed to test the accuracy of T1 mapping with GOAL-SNAP against a two-dimensional inversion recovery (IR) spin-echo (SE) sequence...
November 8, 2017: Radiology
https://www.readbyqxmd.com/read/29117252/preclinical-4d-flow-magnetic-resonance-phase-contrast-imaging-of-the-murine-aortic-arch
#19
Moritz Braig, Jochen Leupold, Marius Menza, Maximilian Russe, Cheng-Wen Ko, Juergen Hennig, Dominik von Elverfeldt
PURPOSE: Cardiovascular diseases remain the number one death cause worldwide. Preclinical 4D flow phase contrast magnetic resonance imaging can provide substantial insights in the analysis of aortic pathophysiologies in various animal models. These insights may allow a better understanding of pathophysiologies, therapy monitoring, and can possibly be translated to humans. This study provides a framework to acquire the velocity field within the aortic arch. It analyses important flow values at different locations within the aortic arch...
2017: PloS One
https://www.readbyqxmd.com/read/29114287/unruptured-internal-carotid-artery-aneurysm-associated-with-functional-pituitary-adenoma-a-true-association
#20
Guru Dutta Satyarthee, Amol Raheja
Detection of incidental intracranial aneurysm on neuroimaging can be associated with pituitary adenoma; however, such association is extremely rare. However, aneurysm with extension into the sella is extremely rare, and increases the risk of inadvertent intraoperative rupture, if trans-sphenoidal decompression is attempted either using endoscopic or microscopic surgical approach. Hanak et al. in a literature review of intrasellar noniatrogenic aneurysms over PubMed search in 2012 could only collect 31 studies, of which only eight cases had pituitary adenoma associated with aneurysm extending into sella...
October 2017: Asian Journal of Neurosurgery
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