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'Brain perfusion'

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https://www.readbyqxmd.com/read/28936173/combining-spect-and-quantitative-eeg-analysis-for-the-automated-differential-diagnosis-of-disorders-with-amnestic-symptoms
#1
Yvonne Höller, Arne C Bathke, Andreas Uhl, Nicolas Strobl, Adelheid Lang, Jürgen Bergmann, Raffaele Nardone, Fabio Rossini, Harald Zauner, Margarita Kirschner, Amirhossein Jahanbekam, Eugen Trinka, Wolfgang Staffen
Single photon emission computed tomography (SPECT) and Electroencephalography (EEG) have become established tools in routine diagnostics of dementia. We aimed to increase the diagnostic power by combining quantitative markers from SPECT and EEG for differential diagnosis of disorders with amnestic symptoms. We hypothesize that the combination of SPECT with measures of interaction (connectivity) in the EEG yields higher diagnostic accuracy than the single modalities. We examined 39 patients with Alzheimer's dementia (AD), 69 patients with depressive cognitive impairment (DCI), 71 patients with amnestic mild cognitive impairment (aMCI), and 41 patients with amnestic subjective cognitive complaints (aSCC)...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28917591/increased-left-prefrontal-brain-perfusion-after-mri-compatible-tdcs-attenuates-momentary-ruminative-self-referential-thoughts
#2
Chris Baeken, Jonathan Remue, Marie-Anne Vanderhasselt, Andre R Brunoni, Sara De Witte, Romain Duprat, Ernst H W Koster, Rudi De Raedt, Guo-Rong Wu
BACKGROUND: Transcranial direct current stimulation (tDCS) is a non-invasive electrical stimulation technique, assumed to influence cognition and emotional processing. OBJECTIVE: However, it is unclear how tDCS influences spontaneous cognitive processes such as momentary self-referential thoughts on the neuronal level. METHODS: Forty healthy female volunteers participated in a single session sham-controlled crossover tDCS study while being in the MRI scanner...
September 6, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28913751/emergency-neurological-life-support-airway-ventilation-and-sedation
#3
Venkatakrishna Rajajee, Becky Riggs, David B Seder
Airway management and ventilation are central to the resuscitation of the neurologically ill. These patients often have evolving processes that threaten the airway and adequate ventilation. Furthermore, intubation, ventilation, and sedative choices directly affect brain perfusion. Therefore, Airway, Ventilation, and Sedation was chosen as an Emergency Neurological Life Support protocol. Topics include airway management, when and how to intubate with special attention to hemodynamics and preservation of cerebral blood flow, mechanical ventilation settings and the use of sedative agents based on the patient's neurological status...
September 14, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/28912128/aging-modifies-the-effect-of-cardiac-output-on-middle-cerebral-artery-blood-flow-velocity
#4
Anne-Sophie G T Bronzwaer, Jasper Verbree, Wim J Stok, Mat J A P Daemen, Mark A van Buchem, Matthias J P van Osch, Johannes J van Lieshout
An association between cerebral blood flow (CBF) and cardiac output (CO) has been established in young healthy subjects. As of yet it is unclear how this association evolves over the life span. To that purpose, we continuously recorded mean arterial pressure (MAP; finger plethysmography), CO (pulse contour; CO-trek), mean blood flow velocity in the middle cerebral artery (MCAV; transcranial Doppler ultrasonography), and end-tidal CO2 partial pressure (PetCO2) in healthy young (19-27 years), middle-aged (51-61 years), and elderly subjects (70-79 years)...
September 2017: Physiological Reports
https://www.readbyqxmd.com/read/28906268/new-pet-markers-for-the-diagnosis-of-dementia
#5
Pierre Payoux, Anne Sophie Salabert
PURPOSE OF REVIEW: To present the new PET markers that could become in the coming years, relevant to advanced clinical approaches to dementia diagnosis, drug trials, and treatment strategies and discuss their advantages and limitations. RECENT FINDINGS: The most advanced new PET tracers are the markers of the amyloid plaques, the τ compounds and the tracers of the translocator protein as markers of neuroinflammation. The main advantages but also the weaknesses of each of these markers are discussed...
September 12, 2017: Current Opinion in Neurology
https://www.readbyqxmd.com/read/28888042/effect-of-a-multinutrient-intervention-after-ischemic-stroke-in-female-c57bl-6-mice
#6
Maximilian Wiesmann, Nienke M Timmer, Bastian Zinnhardt, Dirk Reinhard, Sarah Eligehausen, Anja Königs, Hasnae Ben Jeddi, Pieter J Dederen, Andreas H Jacobs, Amanda J Kiliaan
Stroke can affect females very differently from males, and therefore preclinical research on underlying mechanisms and the effects of interventions should not be restricted to male subjects, and treatment strategies for stroke should be tailored to benefit both sexes. Previously, we demonstrated that a multinutrient intervention (Fortasyn) improved impairments after ischemic stroke induction in male C57Bl/6 mice, but the therapeutic potential of this dietary treatment remained to be investigated in females...
September 9, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28880164/low-dose-dynamic-cerebral-perfusion-computed-tomography-reconstruction-via-kronecker-basis-representation-tensor-sparsity-regularization
#7
Jianhua Ma, Qi Xie, Wenfei Cao, Jiahui Lin, Hao Zhang, Shanli Zhang, Jing Huang, Zhaoying Bian, Deyu Meng, Zongben Xu, Zhengrong Liang, Wufan Chen, Dong Zeng
Dynamic cerebral perfusion computed tomography (DCPCT) has the ability to evaluate the hemodynamic information throughout the brain. However, due to multiple threedimensional image volume acquisitions protocol, DCPCT scanning imposes high radiation dose on the patients with growing concerns. To address this issue, in this study, based on the robust principal component analysis (RPCA, or equivalently the low-rank and sparsity decomposition) model and the DCPCT imaging procedure, we propose a new DCPCT image reconstruction algorithm to improve low-dose DCPCT and perfusion maps quality via using a powerful measure, called Kroneckerbasis- representation (KBR) tensor sparsity regularization, for measuring low-rankness extent of a tensor...
September 4, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28879204/dynamic-susceptibility-contrast-perfusion-magnetic-resonance-imaging-demonstrates-reduced-periventricular-cerebral-blood-flow-in-dogs-with-ventriculomegaly
#8
Martin J Schmidt, Malgorzata Kolecka, Robert Kirberger, Antje Hartmann
The nature of ventriculomegaly in dogs is still a matter of debate. Signs of increased intraventricular pressure and atrophy of the cerebral white matter have been found in dogs with ventriculomegaly, which would imply increased intraventricular pressure and, therefore, a pathological condition, i.e., to some extent. Reduced periventricular blood flow was found in people with high elevated intraventricular pressure. The aim of this study was to compare periventricular brain perfusion in dogs with and without ventriculomegaly using perfusion weighted-magnetic-resonance-imaging to clarify as to whether ventriculomegaly might be associated with an increase in intraventricular pressure...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28858563/imaging-human-brain-perfusion-with-inhaled-hyperpolarized-129-xe-mr-imaging
#9
Madhwesha R Rao, Neil J Stewart, Paul D Griffiths, Graham Norquay, Jim M Wild
Purpose To evaluate the feasibility of directly imaging perfusion of human brain tissue by using magnetic resonance (MR) imaging with inhaled hyperpolarized xenon 129 ((129)Xe). Materials and Methods In vivo imaging with (129)Xe was performed in three healthy participants. The combination of a high-yield spin-exchange optical pumping (129)Xe polarizer, custom-built radiofrequency coils, and an optimized gradient-echo MR imaging protocol was used to achieve signal sensitivity sufficient to directly image hyperpolarized (129)Xe dissolved in the human brain...
August 31, 2017: Radiology
https://www.readbyqxmd.com/read/28838534/true-lumen-perfusion-technique-for-extensive-aortic-dissections-involving-the-neck-and-femoral-vessels
#10
V Rao Parachuri, Ajay Subramanian
Cannulation and perfusion in extensive aortic dissection involving the neck and femoral vessels is challenging in view of false lumen cannulation and attendant malperfusion syndromes. Although a number of methods have been described, our technique of cannulation and perfusion through right atrial-to-left atrial bypass and innominate artery transection ensures adequate brain perfusion and visceral organ true lumen perfusion during the entire duration of cardiopulmonary bypass. This procedure can be applied to all varieties of extensive type A aortic dissections involving the neck and femoral vessels...
September 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28835309/impaired-cerebral-autoregulation-and-elevation-in-plasma-glial-fibrillary-acidic-protein-level-during-cardiopulmonary-bypass-surgery-for-chd
#11
Ronald B Easley, Bradley S Marino, Jacky Jennings, Amy E Cassedy, Kathleen K Kibler, Ken M Brady, Dean B Andropoulos, Marissa Brunetti, Charles W Hogue, Eugenie S Heitmiller, Jennifer K Lee, James Spaeth, Allen D Everett
BACKGROUND: Cerebrovascular reactivity monitoring has been used to identify the lower limit of pressure autoregulation in adult patients with brain injury. We hypothesise that impaired cerebrovascular reactivity and time spent below the lower limit of autoregulation during cardiopulmonary bypass will result in hypoperfusion injuries to the brain detectable by elevation in serum glial fibrillary acidic protein level. METHODS: We designed a multicentre observational pilot study combining concurrent cerebrovascular reactivity and biomarker monitoring during cardiopulmonary bypass...
August 24, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/28820894/short-term-apparent-brain-tissue-changes-are-contributed-by-cerebral-blood-flow-alterations
#12
Qiu Ge, Wei Peng, Jian Zhang, Xuchu Weng, Yong Zhang, Thomas Liu, Yu-Feng Zang, Ze Wang
Structural MRI (sMRI)-identified tissue "growth" after neuropsychological training has been reported in many studies but the origins of those apparent tissue changes (ATC) still remain elusive. One possible contributor to ATC is brain perfusion since T1-weighted MRI, the tool used to identify ATC, is sensitive to perfusion-change induced tissue T1 alterations. To test the hypothetical perfusion contribution to ATC, sMRI data were acquired before and after short-term global and regional perfusion manipulations via intaking a 200 mg caffeine pill and performing a sensorimotor task...
2017: PloS One
https://www.readbyqxmd.com/read/28801040/extracorporeal-cardiopulmonary-resuscitation-for-blunt-cardiac-rupture-a-case-report
#13
Shunsuke Kudo, Keiji Tanaka, Kunihiko Okada, Takahiro Takemura
Extracorporeal cardiopulmonary resuscitation (ECPR) followed by operating room sternotomy, rather than resuscitative thoracotomy, might be life-saving for patients with blunt cardiac rupture and cardiac arrest who do not have multiple severe traumatic injuries. A 49-year-old man was injured in a vehicle crash and transferred to the emergency department. On admission, he was hemodynamically stable, but a plain chest radiograph revealed a widened mediastinum, and echocardiography revealed hemopericardium. A computed tomography scan revealed hemopericardium and mediastinal hematoma, without other severe traumatic injuries...
August 5, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28777701/a-pet-mr-imaging-approach-for-the-integrated-assessment-of-chemotherapy-induced-brain-heart-and-bone-injuries-in-pediatric-cancer-survivors-a-pilot-study
#14
Ashok J Theruvath, Anat Ilivitzki, Anne Muehe, Johanna Theruvath, Praveen Gulaka, Christine Kim, Sandra Luna-Fineman, Kathleen M Sakamoto, Kristen W Yeom, Phillip Yang, Michael Moseley, Frandics Chan, Heike E Daldrup-Link
Purpose To develop a positron emission tomography (PET)/magnetic resonance (MR) imaging protocol for evaluation of the brain, heart, and joints of pediatric cancer survivors for chemotherapy-induced injuries in one session. Materials and Methods Three teams of experts in neuroimaging, cardiac imaging, and bone imaging were tasked to develop a 20-30-minute PET/MR imaging protocol for detection of chemotherapy-induced tissue injuries of the brain, heart, and bone. In an institutional review board-approved, HIPAA-compliant, prospective study from April to July 2016, 10 pediatric cancer survivors who completed chemotherapy underwent imaging of the brain, heart, and bone with a 3-T PET/MR imager...
August 4, 2017: Radiology
https://www.readbyqxmd.com/read/28770549/therapy-related-longitudinal-brain-perfusion-changes-in-patients-with-chronic-pelvic-pain-syndrome
#15
Christian Weisstanner, Livio Mordasini, George N Thalmann, Rajeev K Verma, Christian Rummel, Andrea Federspiel, Thomas M Kessler, Roland Wiest
BACKGROUND: The imaging method most frequently employed to identify brain areas involved in neuronal processing of nociception and brain pain perception is blood oxygenation level-dependent (BOLD) magnetic resonance imaging (MRI). Arterial spin labelling (ASL), in contrast, offers advantages when slow varying changes in brain function are investigated. Chronic pelvic pain syndrome (CPPS) is a disorder of, mostly, young males that leads to altered pain perceptions in structures related to the pelvis...
August 3, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28763503/increased-heterogeneity-of-brain-perfusion-is-an-early-marker-of-central-nervous-system-involvement-in-antiphospholipid-antibody-carriers
#16
Ting-Syuan Lin, Pei-Ying Hsu, Chin-Hao Chang, Chi-Lun Ko, Yu-Min Kuo, Yen-Wen Wu, Ruoh-Fang Yen, Cheng-Han Wu, Ko-Jen Li, Yenh-Chen Hsein, Song-Chou Hsieh
OBJECTIVE: The non-criteria neuropsychiatric manifestations of antiphospholipid syndrome include headache, dizziness, vertigo, seizure, depression and psychosis. There were still no objective methods qualified to detect the early central nervous system involvement in non-criteria antiphospholipid syndrome. We evaluated the effectiveness of Tc-99m ECD SPECT in assessing circulatory insufficiency in the brains of patients with antiphospholipid antibodies and neuropsychiatric symptoms but without thromboembolism...
2017: PloS One
https://www.readbyqxmd.com/read/28761534/efficacy-of-superficial-temporal-artery-middle-cerebral-artery-bypass-in-cerebrovascular-steno-occlusive-diseases-hemodynamics-assessed-by-perfusion-computed-tomography
#17
Woo-Keun Kwon, Taek-Hyun Kwon, Dong-Hyuk Park, Joo-Han Kim, Sung-Kon Ha
OBJECTIVES: Our purpose of this study was to assess the cerebral hemodynamic improvement with perfusion computed tomography (CT), before and after superficial temporal artery (STA) to middle cerebral artery (MCA) bypass surgery in patients with cerebrovascular steno-occlusive diseases including both moyamoya disease and nonmoyamoya steno-occlusions. MATERIALS AND METHODS: Twenty-four STA-MCA bypasses were performed to 22 patients with symptomatic cerebrovascular steno-occlusive diseases, including both moyamoya disease and nonmoyamoya steno-occlusive diseases...
July 2017: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/28740479/non-ischemic-cerebral-energy-dysfunction-at-the-early-brain-injury-phase-following-aneurysmal-subarachnoid-hemorrhage
#18
Laurent Carteron, Camille Patet, Daria Solari, Mahmoud Messerer, Roy T Daniel, Philippe Eckert, Reto Meuli, Mauro Oddo
BACKGROUND: The pathophysiology of early brain injury following aneurysmal subarachnoid hemorrhage (SAH) is still not completely understood. OBJECTIVE: Using brain perfusion CT (PCT) and cerebral microdialysis (CMD), we examined whether non-ischemic cerebral energy dysfunction may be a pathogenic determinant of EBI. METHODS: A total of 21 PCTs were performed (a median of 41 h from ictus onset) among a cohort of 18 comatose mechanically ventilated SAH patients (mean age 58 years, median admission WFNS score 4) who underwent CMD and brain tissue PO2 (PbtO2) monitoring...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28738690/magnetic-resonance-imaging-in-children-presenting-migraine-with-aura-association-of-hypoperfusion-detected-by-arterial-spin-labelling-and-vasospasm-on-mr-angiography-findings
#19
Domitille Cadiot, Romain Longuet, Bertrand Bruneau, Catherine Treguier, Aline Carsin-Vu, Isabelle Corouge, Constantin Gomes, Maïa Proisy
Objective A child presenting with a first attack of migraine with aura usually undergoes magnetic resonance imaging (MRI) to rule out stroke. The purpose of this study was to report vascular and brain perfusion findings in children suffering from migraine with aura on time-of-flight MR angiography (TOF-MRA) and MR perfusion imaging using arterial spin labelling (ASL). Methods We retrospectively included all children who had undergone an emergency MRI examination with ASL and TOF-MRA sequences for acute neurological deficit and were given a final diagnosis of migraine with aura...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/28736949/simultaneous-measurement-of-brain-perfusion-and-labeling-efficiency-in-a-single-pseudo-continuous-arterial-spin-labeling-scan
#20
Zhensen Chen, Xihai Zhao, Xingxing Zhang, Rui Guo, Wouter M Teeuwisse, Bida Zhang, Peter Koken, Jouke Smink, Chun Yuan, Matthias J P van Osch
PURPOSE: The aim of this study was to propose, optimize, and validate a pseudo-continuous arterial spin labeling (pCASL) sequence for simultaneous measurement of brain perfusion and labeling efficiency. METHODS: The proposed sequence incorporates the labeling efficiency measurement into the postlabeling delay period of a conventional perfusion pCASL sequence by using the time-encoding approach. In vivo validation experiments were performed on nine young subjects by comparing it to separate perfusion and labeling efficiency sequences...
July 24, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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