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https://www.readbyqxmd.com/read/28636928/neurovascular-toxicity-of-n-methyl-d-aspartate-is-markedly-enhanced-in-the-developing-mouse-central-nervous-system
#1
Sudhakar Vadivelu, Kui Xu, Vanja Tolj, Rahul Rege, Lindsay Darkins, Karthik Vishwanath
Penumbral perfusion is critical to brain viability. Proximal arterial occlusion and deep brain stroke has variable effect on cortical dysfunction. Cortical microvessel collaterals may be recruited and at times sufficient for partial parenchymal perfusion. Postnatal neural and endothelial cells are markedly vulnerable to glutamate excitotoxicity. Early vascular cell stress may promote partial protective neural preconditioning though postnatally a developmental window of the cerebral microvasculature may be particularly vulnerable to injury...
June 18, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28626056/early-reperfusion-after-brain-ischemia-has-beneficial-effects-beyond-rescuing-neurons
#2
Masaki Tachibana, Tetsuro Ago, Yoshinobu Wakisaka, Junya Kuroda, Masahiro Shijo, Yoji Yoshikawa, Motohiro Komori, Ataru Nishimura, Noriko Makihara, Kuniyuki Nakamura, Takanari Kitazono
BACKGROUND AND PURPOSE: Recent studies show that successful endovascular thrombectomy 6 to 12 hours after stroke onset enhances functional outcomes 3 months later. In this study, we investigated the effects of reperfusion after ischemia on repair processes in the ischemic areas, as well as on functional recovery, using mouse stroke models. METHODS: We examined time-dependent histological changes and functional recovery after transient middle cerebral artery occlusion of different durations, including permanent middle cerebral artery occlusion, using the CB-17 (CB-17/lcr-+/+Jcl) mouse strain, which has poor pial collateral blood flow...
June 16, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28620564/moyamoya-syndrome-in-a-child-with-neurofibromatosis-type-1-magnetic-resonance-imaging-as-a-tool-for-clinical-decision-making
#3
Jonathan Mayl, Hanisha Patel, Tushar Chandra
Moyamoya syndrome is a rare cerebrovasculopathy of unknown etiology which is associated with multiple risk factors. Moyamoya was first discovered in Japan and is reported to have an increased prevalence in the Japanese population. The term "Moyamoya" translates into "puff of smoke" and is named after the finding of the collateral cerebral vasculature that develops secondary to occlusion of an internal carotid artery at the entrance into the circle of Willis. This collateral vasculature characterizes the disease...
May 9, 2017: Curēus
https://www.readbyqxmd.com/read/28611828/heads-up-a-novel-provocative-maneuver-to-guide-acute-ischemic-stroke-management
#4
Latisha K Ali, Julius K Weng, Sidney Starkman, Jeffrey L Saver, Doojin Kim, Bruce Ovbiagele, Brian H Buck, Nerses Sanossian, Paul Vespa, Oh Young Bang, Reza Jahan, Gary R Duckwiler, Fernando Viñuela, David S Liebeskind
BACKGROUND: A common dilemma in acute ischemic stroke management is whether to pursue recanalization therapy in patients with large vessel occlusions but minimal neurologic deficits. We describe and report preliminary experience with a provocative maneuver, i.e. 90-degree elevation of the head of bed for 30 min, which stresses collaterals and facilitates decision-making. METHODS: A prospective cohort study of <7.5 h of acute anterior circulation territory ischemia patients with minimal deficits despite middle cerebral artery (MCA) or internal carotid artery (ICA) occlusive disease...
March 2017: Interventional Neurology
https://www.readbyqxmd.com/read/28602923/successful-hybrid-neurovascular-surgery-for-a-ruptured-basilar-artery-dissecting-aneurysm-in-a-patient-with-jeopardized-collateral-circulation-associated-with-aortitis-syndrome-case-report
#5
Kazuaki Yamamoto, Takahisa Mori, Tsuyoshi Watanabe, Tomonori Iwata, Gakuji Gondo, Masahiko Tanaka, Satoshi Tanaka
BACKGROUND: Dissecting aneurysms of the basilar artery (BA) are rare lesions and the management of them has been controversial and challenging. The treatment becomes much more difficult when the patient has a disorder such as aortitis syndrome, which makes cerebral arteries occluded and tortuous. The authors describe a case of a ruptured BA dissecting aneurysm associated with aortitis syndrome, successfully treated with hybrid neurovascular surgery. CASE DESCRIPTION: A 64-year-old woman with a medical history of aortitis syndrome developed a severe headache and was diagnosed with a subarachnoid hemorrhage from a BA dissecting aneurysm...
June 8, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28600011/direct-versus-indirect-bypass-for-moyamoya-disease
#6
REVIEW
Jonathan J Liu, Gary K Steinberg
Moyamoya disease is a progressive occlusive vasculopathy that involves the supraclinoid internal carotid arteries and Circle of Willis, and results in the formation of collateral vessels at the skull base. The progressive nature of this disease leads to cerebral ischemia and sometimes intracerebral hemorrhage. The treatment of moyamoya disease is mainly surgical revascularization, using revascularization techniques that include direct, indirect, and combined strategies. Here we discuss the available options for revascularization as well as our opinions regarding the surgical management of patients with moyamoya disease...
July 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/28598243/advances-in-arterial-spin-labelling-mri-methods-for-measuring-perfusion-and-collateral-flow
#7
Matthias Jp van Osch, Wouter M Teeuwisse, Zhensen Chen, Yuriko Suzuki, Michael Helle, Sophie Schmid
With the publication in 2015 of the consensus statement by the perfusion study group of the International Society for Magnetic Resonance in Medicine (ISMRM) and the EU-COST action 'ASL in dementia' on the implementation of arterial spin labelling MRI (ASL) in a clinical setting, the development of ASL can be considered to have become mature and ready for clinical prime-time. In this review article new developments and remaining issues will be discussed, especially focusing on quantification of ASL as well as on new technological developments of ASL for perfusion imaging and flow territory mapping...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28592050/-the-chinese-guidelines-for-the-evaluation-and-management-of-cerebral-collateral-circulation-in-ischemic-stroke-2017
#8
(no author information available yet)
Precise evaluation of the structure and function of collateral circulation is vital for individualized management in stroke. By summarizing the most up-to-date evidence, the new concepts and clinical significance of cerebral collaterals are highlighted in the guideline, and clinical recommendations for the evaluation and management strategies of cerebral collateral circulation are provided.
June 1, 2017: Zhonghua Nei Ke za Zhi [Chinese Journal of Internal Medicine]
https://www.readbyqxmd.com/read/28583178/therapeutic-angiogenesis-of-adipose-derived-stem-cells-for-ischemic-diseases
#9
REVIEW
Lina Zhao, Takerra Johnson, Dong Liu
Ischemic diseases, the leading cause of disability and death, are caused by the stenosis or obstruction of arterioles/capillaries that is not compensated for by vessel dilatation or collateral circulation. Angiogenesis is a complex process leading to new blood vessel formation and is triggered by ischemic conditions. Adequate angiogenesis, as a compensatory mechanism in response to ischemia, may increase oxygen and nutrient supplies to tissues and protect their function. Therapeutic angiogenesis has been the most promising therapy for treating ischemic diseases...
June 5, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28579899/effects-of-the-rabdosia-rubescens-total-flavonoids-on-focal-cerebral-ischemia-reperfusion-model-in-rats
#10
Mingsan Miao, Xiaoli Yan, Lin Guo, Shuai Shao
The effect of the Rabdosia rubescens total flavonoids on focal cerebral ischemia reperfusion model in rats was observed. The model group, nimodipine group, cerebral collateral group, and large, medium and small dose group of the Rabdosia rubescens total flavonoids were administered with corresponding drugs but sham operation group and model group were administered the same volume of 0.5%CMC, 1 times a day, continuous administration of 7 d. After 1 h at 7 d to medicine, left incision in the middle of the neck of rats after anesthesia, we can firstly expose and isolate the left common carotid artery (CCA), and then expose external carotid artery (ECA) and internal carotid artery (ICA)...
May 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28579039/total-mismatch-of-diffusion-weighted-imaging-and-susceptibility-weighted-imaging-in-patients-with-acute-cerebral-ischemia
#11
Min-Gyu Park, Jeong A Yeom, Seung Kug Baik, Kyung-Pil Park
BACKGROUND AND PURPOSE: Multiple hypointense vessels (MHV) on susceptibility-weighted imaging (SWI) is associated with an increased oxygen demand in acute cerebral ischemia. Occasionally, some patients exhibit extensive MHV on SWI despite of negative diffusion-weighted imaging (DWI), which is a phenomenon called total mismatch DWI-SWI. We analyzed the clinical characteristics and imaging findings in patients with the total DWI-SWI mismatch. MATERIALS AND METHODS: We selected patients with total DWI-SWI mismatch who underwent MRI within 12hours from onset...
May 31, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/28574313/rationale-for-graft-selection-in-patients-with-complex-internal-carotid-artery-aneurysms-treated-with-extracranial-to-intracranial-high-flow-bypass-and-therapeutic-internal-carotid-artery-occlusion
#12
Hidetoshi Matsukawa, Shiro Miyata, Toshiyuki Tsuboi, Kosumo Noda, Nakao Ota, Osamu Takahashi, Rihee Takeda, Sadahisa Tokuda, Hiroyasu Kamiyama, Rokuya Tanikawa
OBJECTIVE After internal carotid artery (ICA) sacrifice without revascularization for complex aneurysms, ischemic complications can occur. In addition, hemodynamic alterations in the circle of Willis create conditions conducive to the formation of de novo aneurysms or the enlargement of existing untreated aneurysms. Therefore, the revascularization technique remains indispensable. Because vessel sizes and the development of collateral circulation are different in each patient, the ideal graft size to prevent low flow-related ischemic complications (LRICs) in external carotid artery (ECA)-middle cerebral artery (MCA) bypass with therapeutic ICA occlusion (ICAO) has not been well established...
June 2, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28562569/traumatic-open-depressed-cranial-fracture-causing-occlusion-of-posterior-superior-sagittal-sinus-case-report
#13
Han-Song Sheng, Fang Shen, Jian Lin, Guang-Hui Bai, Fen-Chun Lin, Dan-Dong Li, Nu Zhang
RATIONALE: The superior sagittal sinus (SSS) is the major dural sinuses that receive a considerable amount of venous drainage. Interruption of its posterior third has been suggested to cause intracranial hypertension and lead to potentially fatal consequences. PATIENT CONCERNS: We presented a 22-year-old man with a severe headache and scalp bleeding after a head chop wound. Physical examination identified a 20-cm straight laceration in his parietooccipital scalp...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28555527/mapping-the-collaterome-for-precision-cerebrovascular-health-theranostics-in-the-continuum-of-stroke-and-dementia
#14
David S Liebeskind
Precision cerebrovascular health or individualized long-term preservation of the brain and associated blood vessels, is predicated on understanding, diagnosing, and tailoring therapies for people at risk of ischemic injury associated with stroke and vascular dementia. The associated imaging patterns are sculpted by the protective effect of the collaterome, the innate compensatory ability of the brain and vasculature to offset hypoperfusion when antegrade or normal arterial inflow pathways are compromised. Theranostics or rational and synchronous use of diagnostic studies in tandem with specific therapies to optimally guide patient outcomes in ischemic brain disorders may capitalize on the pivotal role of the collaterome...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28530158/analyzing-circle-of-willis-blood-flow-in-ischemic-stroke-patients-through-3d-stroke-arterial-flow-estimation
#15
Aichi Chien, Fernando Viñuela
Background The objective of ischemic stroke (IS) treatment is to achieve revascularization in cerebral arteries to restore blood flow. However, there is no available method to extract arterial flow data from clinical CTA images. We developed 3D Stroke Arterial Flow Estimation (SAFE), which provides blood flow data throughout the Circle of Willis based on 3D CTA and allows comparison of arterial flow distribution in the brain. Methods We implemented a newly developed 3D vascular reconstruction algorithm for clinical stroke CTA images...
January 1, 2017: Interventional Neuroradiology
https://www.readbyqxmd.com/read/28515593/role-of-penumbra-mechanical-thrombectomy-device-in-acute-dural-sinus-thrombosis
#16
Suraj Mammen, Shyamkumar Nidugala Keshava, Vinu Moses, Sanjith Aaron, Munawwar Ahmed, George K Chiramel, Sunithi E Mani, Mathew Alexander
BACKGROUND: In dural venous sinus thrombosis (DVST), the mortality ranges 5-30%. Deep venous system involvement and septic dural sinus thrombosis have a higher mortality rate. In acute occlusion, collateral flow may not be established, which may result in significant edema and mass effect. Endovascular interventions may be considered as a treatment option in appropriate high-risk patients with DVST. MATERIALS AND METHODS: Eight patients with magnetic resonance imaging (MRI)-confirmed dural sinus thrombosis, who did not respond to the conventional standard medical treatment, were subsequently treated with mechanical thrombectomy using the Penumbra System(®)...
January 2017: Indian Journal of Radiology & Imaging
https://www.readbyqxmd.com/read/28465268/intracranial-blood-flow-changes-in-patients-with-high-grade-severe-carotid-artery-stenosis-after-stenting
#17
Lei Huang, Wenjie Cao, Liang Ge, Gang Lu, Xiaolong Zhang, Daoying Geng
OBJECTIVE: We investigated whether the cerebral hemodynamic changes of pre- and poststenting in patients with severe carotid stenosis differ by stenosis grades. MATERIALS AND METHODS: We prospectively recruited patients who underwent carotid artery stenting (CAS) after acute ischemic stroke from June 2014 to December 2015. We compared the mean relative cerebral blood flow changes (rCBF) (measured by whole-brain computed tomography [CT] perfusion) pre- and poststenting in patients with high-grade severe stenosis (HGSS 90%-99%) versus patients with low-grade severe stenosis (LGSS 70%-89%)...
April 29, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28450666/anomalies-of-the-middle-cerebral-artery
#18
Naoyuki Uchiyama
There are several anomalies of the middle cerebral artery (MCA) in humans, such as accessory MCA, duplicated MCA, fenestration of MCA, and duplicated origin of MCA. Recently, unfused or twig-like MCA, which indicates MCA trunk occlusion with collateral plexiform arterial network, have been reported. During the embryonic stage, MCA is thought to generate from plexiform arterial twigs arising from the anterior cerebral artery, and these twigs form the definitive MCA by fusion and regression at the end of the development stage...
April 27, 2017: Neurologia Medico-chirurgica
https://www.readbyqxmd.com/read/28442944/immunohistochemical-localization-of-translationally-controlled-tumor-protein-in-axon-terminals-of-mouse-hippocampal-neurons
#19
Seong-Yeon Bae, Vadim Sheverdin, Jeehye Maeng, In Kyoon Lyoo, Pyung-Lim Han, Kyunglim Lee
Translationally controlled tumor protein (TCTP) is a cytosolic protein with microtubule stabilization and calcium-binding activities. TCTP is expressed in most organs including the nervous system. However, detailed distribution and functional significance of TCTP in the brain remain unexplored. In this study, we investigated the global and subcellular distributions of TCTP in the mouse brain. Immunohistochemical analyses with anti-TCTP revealed that TCTP was widely distributed in almost all regions of the brain including the cerebral cortex, thalamus, hypothalamus, hippocampus, and amygdala, wherein it was localized in axon tracts and axon terminals...
April 2017: Experimental Neurobiology
https://www.readbyqxmd.com/read/28439614/internal-carotid-artery-stenosis-and-collateral-recruitment-in-stroke-patients
#20
Jan W Dankbaar, Kelly G P Kerckhoffs, Alexander D Horsch, Irene C van der Schaaf, L Jaap Kappelle, Birgitta K Velthuis
PURPOSE: Leptomeningeal collaterals improve outcome in stroke patients. There is great individual variability in their extent. Internal carotid artery (ICA) stenosis may lead to more extensive recruitment of leptomeningeal collaterals. The purpose of this study was to evaluate the association of pre-existing ICA stenosis with leptomeningeal collateral filling visualized with computed tomography perfusion (CTP). METHODS: From a prospective acute ischemic stroke cohort, patients were included with an M1 middle cerebral artery (MCA) occlusion and absent ipsilateral, extracranial ICA occlusion...
April 24, 2017: Clinical Neuroradiology
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