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Cerebrovascular anatomy

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https://www.readbyqxmd.com/read/28541130/measuring-functional-connectivity-in-stroke-approaches-and-considerations
#1
Joshua S Siegel, Gordon L Shulman, Maurizio Corbetta
Recent research has demonstrated the importance of global changes to the functional organization of brain network following stroke. Resting functional magnetic resonance imaging (R-fMRI) is a non-invasive tool that enables the measurement of functional connectivity (FC) across the entire brain while placing minimal demands on the subject. For these reasons, it is a uniquely appealing tool for studying the distant effects of stroke. However, R-fMRI studies rely on a number of premises that cannot be assumed without careful validation in the context of stroke...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28535731/transcervical-carotid-stent-placement-in-the-setting-of-a-hostile-neck-and-a-type-iii-aortic-arch
#2
Lauren A Huntress, Naiem Nassiri, Randy Shafritz, Saum A Rahimi
Previous radical neck dissection and neck irradiation pose considerable operative risks in patients requiring carotid endarterectomy for symptomatic carotid disease. Carotid stenting is an acceptable alternative for these patients but carries a higher risk of cerebrovascular accidents especially in patients with type III aortic arch anatomy. Herein, we present a technically challenging case of a patient with an irradiated neck and a history of radical neck dissection who presented with a symptomatic high-grade left internal carotid artery stenosis in the setting of a type III aortic arch...
January 1, 2017: Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28523471/quantification-of-left-atrial-volume-and-phasic-function-using-cardiovascular-magnetic-resonance-imaging-comparison-of-biplane-area-length-method-and-simpson-s-method
#3
Laura Kristin Wandelt, Johannes Tammo Kowallick, Andreas Schuster, Rolf Wachter, Thomas Stümpfig, Christina Unterberg-Buchwald, Michael Steinmetz, Christian Oliver Ritter, Joachim Lotz, Wieland Staab
Left atrial (LA) enlargement and dysfunction are markers of chronic diastolic dysfunction and an important predictor of adverse cardiovascular and cerebrovascular outcomes. Accordingly, accurate quantification of left atrial volume (LAV) and function is needed. In routine clinical cardiovascular magnetic resonance (CMR) imaging the biplane area-length method (Bi-ALM) is frequently applied due to time-saving image acquisition and analysis. However, given the varying anatomy of the LA we hypothesized that the diagnostic accuracy of the Bi-ALM is not sufficient and that results would be different from a precise volumetric assessment of transversal multi-slice cine images using Simpson's method...
May 18, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28451353/highly-specific-noninvasive-photoacoustic-and-positron-emission-tomography-of-brain-plaque-with-functionalized-croconium-dye-labeled-by-a-radiotracer
#4
Yajing Liu, Yanping Yang, Mingjian Sun, Mengchao Cui, Ying Fu, Yu Lin, Zijing Li, Liming Nie
Highly-efficient targeting probes are desirable for disease diagnosis and functional imaging. However, most of the current near-infrared (NIR) probes suffer from low signal conversion, insufficient photostability, poor probe specificity, and limited functions. Herein, an NIR ultrahigh absorbing croconium dye for amyloid (CDA) was designed and synthesized to specifically bind to cerebrovascular amyloid without antibody linkage. This unique CDA is able to strongly bind the hydrophobic channels of amyloid beta (Aβ) fiber with a very strong binding energy of -9...
April 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28437244/second-transcatheter-closure-for-residual-shunt-following-percutaneous-closure-of-patent-foramen-ovale
#5
Njomeza Susuri, Slayman Obeid, Mirjam Ulmi, George Cm Siontis, Andreas Wahl, Stephan Windecker, Fabian Nietlispach, Bernhard Meier, Fabien Praz
AIMS: Residual shunt following percutaneous patent foramen ovale (PFO) closure has been described in up to 49% of the patients and is associated with recurrent cerebrovascular events. Our aim was to evaluate the safety, feasibility, and mid-term outcomes of transcatheter residual shunt closure. METHODS AND RESULTS: From 1994 to July 2016, 2679 patients underwent transcatheter PFO closure for treatment of presumed paradoxical embolism at our institution. Among them, 100 patients (3...
April 25, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28430115/a-systematic-review-of-3-d-printing-in-cardiovascular-and-cerebrovascular-diseases
#6
Zhonghua Sun, Shen Yuan Lee
OBJECTIVE: The application of 3-D printing has been increasingly used in medicine, with research showing many applications in cardiovascular disease. This systematic review analyzes those studies published about the applications of 3-D printed, patient-specific models in cardiovascular and cerebrovascular diseases. METHODS: A search of PubMed/Medline and Scopus databases was performed to identify studies investigating the 3-D printing in cardiovascular and cerebrovascular diseases...
April 10, 2017: Anatolian Journal of Cardiology
https://www.readbyqxmd.com/read/28386716/importance-of-variants-in-cerebrovascular-anatomy-for-potential-retrograde-embolization-in-cryptogenic-stroke
#7
Michael Markl, Edouard Semaan, LeRoy Stromberg, James Carr, Shyam Prabhakaran, Jeremy Collins
OBJECTIVES: To test the hypothesis that variants in cerebrovascular anatomy will affect the number of patients demonstrating a plausible retrograde embolization mechanism from plaques in the descending aorta (DAo). METHODS: Thirty-five patients (aged 63 ± 17 years) with cryptogenic stroke underwent 4D flow MRI for the assessment of aortic 3D blood flow and MR angiography for the evaluation of circle of Willis, posterior circulation, and aortic arch architecture...
April 6, 2017: European Radiology
https://www.readbyqxmd.com/read/28384909/immediate-outcome-of-balloon-mitral-valvuloplasty-with-jomiva-balloon-during-pregnancy
#8
Shanmuga Sundaram Rathakrisnnan, Ramona Ramasamy, Tamilarasu Kaliappan, Rajendiran Gopalan, Ramasmy Palanimuthu, Premkrishna Anandhan
INTRODUCTION: Rheumatic mitral stenosis is the most common Valvular Heart Disease encountered during pregnancy. Balloon Mitral Valvuloplasty (BMV) is one of the treatment option available if the symptoms are refractory to the medical management and the valve anatomy is suitable for balloon dilatation. BMV with Inoue balloon is the most common technique being followed worldwide. Over the wire BMV is a modified technique using Joseph Mitral Valvuloplasty (JOMIVA) balloon catheter which is being followed in certain centres...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28268528/estimation-of-voxel-wise-dynamic-cerebrovascular-reactivity-curves-from-resting-state-fmri-data
#9
Prokopis C Prokopiou, Kevin Murphy, Richard G Wise, Georgios D Mitsis
In this work, we investigate the linear dynamic interactions between fluctuations in arterial CO2 that occur during normal breathing, and the BOLD fMRI signal. We cast this problem within a systems-theoretic framework, where we employ functional expansions for the estimation of the impulse responses in large regions of interest, as well as in individual voxels. We also implement classification schemes in order to identify different brain regions with similar cerebrovascular reactivity characteristics. Our results reveal that it is feasible to obtain reliable estimates of cerebrovascular reactivity curves from resting-state data and that these curves exhibit considerable variability across different brain regions that may be related to the underlying anatomy...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28256020/left-atrial-anatomy-and-patient-related-factors-associated-with-adverse-outcomes-with-the-watchman-device-a-real-world-experience
#10
Shishir Murarka, Mohamad Lazkani, Soundos Moualla, Divya Ratan Verma, Ashish Pershad
OBJECTIVE: This study sought to identify patient and left atrial morphology specific factors associated with early complications for left atrial appendage occlusion with the Watchman™ (Boston Scientific, Natick, MA) device. BACKGROUND: Oral anticoagulation (OAC) is recommended for patients with atrial fibrillation, however, long-term OAC compliance is poor. In randomized control trials, the Watchman™ device has demonstrated superiority over OAC with warfarin for all cause and cardiovascular mortality and hemorrhagic stroke...
April 2017: Journal of Interventional Cardiology
https://www.readbyqxmd.com/read/28226702/estimation-of-voxel-wise-dynamic-cerebrovascular-reactivity-curves-from-resting-state-fmri-data
#11
Prokopis C Prokopiou, Kevin Murphy, Richard G Wise, Georgios D Mitsis, Prokopis C Prokopiou, Kevin Murphy, Richard G Wise, Georgios D Mitsis, Prokopis C Prokopiou, Georgios D Mitsis, Richard G Wise, Kevin Murphy
In this work, we investigate the linear dynamic interactions between fluctuations in arterial CO2 that occur during normal breathing, and the BOLD fMRI signal. We cast this problem within a systems-theoretic framework, where we employ functional expansions for the estimation of the impulse responses in large regions of interest, as well as in individual voxels. We also implement classification schemes in order to identify different brain regions with similar cerebrovascular reactivity characteristics. Our results reveal that it is feasible to obtain reliable estimates of cerebrovascular reactivity curves from resting-state data and that these curves exhibit considerable variability across different brain regions that may be related to the underlying anatomy...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28209740/quantitative-mri-volumetry-diffusivity-cerebrovascular-flow-and-cranial-hydrodynamics-during-head-down-tilt-and-hypercapnia-the-spacecot-study
#12
Larry Allen Kramer, Khader M Hasan, Ashot E Sargsyan, Karina Marshall-Goebel, Jörn Rittweger, Dorit Donoviel, Saki Higashi, Benson Mwangi, Darius A Gerlach, Eric M Bershad
PURPOSE: In order to improve the pathophysiologic understanding of visual changes observed in astronauts, we aimed to use quantitative MRI to measure anatomic and physiologic responses during a ground-based spaceflight analogue (head down tilt, HDT) combined with increased ambient carbon dioxide (CO2). METHODS: Six healthy, male subjects participated in the double-blinded, randomized cross-over design study with two conditions: 26.5 h of -12° HDT with ambient air and with 0...
February 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28202827/-cerebrovascular-diseases-from-the-perspective-of-embryology-anatomy-and-genetics
#13
Masaki Komiyama
No abstract text is available yet for this article.
February 2017: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/28198523/diversity-among-posterior-thalamoperforating-branches-originated-from-p1-segment-systematic-review
#14
Cezary Grochowski, Ryszard Maciejewski
BACKGROUND: The P1 segment of the posterior cerebral artery (PCA) begins at the termination of the basilar artery and ends at the origin of posterior communicating artery (PCoM), within the interpeduncular cistern. Perforating branches arising from this segment are called posterior thalamoperforating arteries and the main and biggest artery among those is called thalamoperforating artery (TPA). Perforating branches are a crucial component of cerebrovascular system supplying the posterior part of the thalamus, subthalamus, hypothalamus, substantia nigra, perforated substance, posterior part of internal capsule and the nucleus of III and IV cranial nerve...
February 15, 2017: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/28183839/mr-imaging-of-individual-perfusion-reorganization-using-superselective-pseudocontinuous-arterial-spin-labeling-in-patients-with-complex-extracranial-steno-occlusive-disease
#15
V Richter, M Helle, M J P van Osch, T Lindner, A S Gersing, P Tsantilas, H-H Eckstein, C Preibisch, C Zimmer
BACKGROUND AND PURPOSE: Patients with multiple stenoses or occlusions of the extracranial arteries require an individualized diagnostic approach. We evaluated the feasibility and clinical utility of a novel MR imaging technique for regional perfusion imaging in this patient group. MATERIALS AND METHODS: Superselective pseudocontinuous arterial spin-labeling with a circular labeling spot enabling selective vessel labeling was added to routine imaging in a prospective pilot study in 50 patients (10 women, 70...
February 9, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28151414/basilar-stroke-from-a-persistent-hypoglossal-artery
#16
Alfred P See, Jacob F Baranoski, Bruno C Flores, Andrew Ducruet, Felipe C Albuquerque
Occlusion of the basilar artery can be treated with endovascular thrombectomy, although the results have not been well studied. Persistent fetal cerebrovascular anatomy can lead to unusual presentation of carotid atherosclerotic disease and can be a barrier to successful mechanical thrombectomy if not recognized. This case presents a rare persistent carotico-basilar anastomosis which resulted in basilar occlusion via the persistent hypoglossal artery and coincident absence of contralateral vertebral arterial access due to a left vertebral artery terminating in the left posterior inferior cerebellar artery...
February 1, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28137542/developing-the-first-highly-specialized-neurosurgical-center-of-excellence-in-trujillo-peru-work-in-progress-first-four-months-results
#17
Joham Choque-Velasquez, Roberto Colasanti, Virginia Baffigo-Torre, Luisa Estela Sacieta-Carbajo, Jacqueline Olivari-Heredia, Yolanda Falcon-Lizaraso, Juan Huber Mallma-Torres, Humberto Elera-Florez, Juha Hernesniemi
BACKGROUND: Economic, cultural, and geographical reasons usually limit the access to specialized health centers in developing countries, especially in rural areas. Peruvian health system indicators still highlight significant unmet clinical need for neurosurgical patients. Our project is to develop the first highly specialized neurosurgical center in the EsSalud hospital of Trujillo, with the goal to improve the treatment of neurosurgical diseases in that region, thus optimizing their outcomes while decreasing expensive and risky patients transfer to the neurosurgical departments in the capital district...
January 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28135646/gap-free-segmentation-of-vascular-networks-with-automatic-image-processing-pipeline
#18
Chih-Yang Hsu, Mahsa Ghaffari, Ali Alaraj, Michael Flannery, Xiaohong Joe Zhou, Andreas Linninger
Current image processing techniques capture large vessels reliably but often fail to preserve connectivity in bifurcations and small vessels. Imaging artifacts and noise can create gaps and discontinuity of intensity that hinders segmentation of vascular trees. However, topological analysis of vascular trees require proper connectivity without gaps, loops or dangling segments. Proper tree connectivity is also important for high quality rendering of surface meshes for scientific visualization or 3D printing...
March 1, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28130280/basilar-stroke-from-a-persistent-hypoglossal-artery
#19
Alfred P See, Jacob F Baranoski, Bruno C Flores, Andrew Ducruet, Felipe C Albuquerque
Occlusion of the basilar artery can be treated with endovascular thrombectomy, although the results have not been well studied. Persistent fetal cerebrovascular anatomy can lead to unusual presentation of carotid atherosclerotic disease and can be a barrier to successful mechanical thrombectomy if not recognized. This case presents a rare persistent carotico-basilar anastomosis which resulted in basilar occlusion via the persistent hypoglossal artery and coincident absence of contralateral vertebral arterial access due to a left vertebral artery terminating in the left posterior inferior cerebellar artery...
January 27, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28111187/functional-and-oxygen-metabolic-photoacoustic-microscopy-of-the-awake-mouse-brain
#20
Rui Cao, Jun Li, Bo Ning, Naidi Sun, Tianxiong Wang, Zhiyi Zuo, Song Hu
A long-standing challenge in optical neuroimaging has been the assessment of hemodynamics and oxygen metabolism in the awake rodent brain at the microscopic level. Here, we report first-of-a-kind head-restrained photoacoustic microscopy (PAM), which enables simultaneous imaging of the cerebrovascular anatomy, total concentration and oxygen saturation of hemoglobin, and blood flow in awake mice. Combining these hemodynamic measurements allows us to derive two key metabolic parameters-oxygen extraction fraction (OEF) and the cerebral metabolic rate of oxygen (CMRO2)...
April 15, 2017: NeuroImage
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