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https://www.readbyqxmd.com/read/29026001/understanding-a-role-for-hypoxia-in-lesion-formation-and-location-in-the-deep-and-periventricular-white-matter-in-small-vessel-disease-and-multiple-sclerosis
#1
REVIEW
Santiago Martinez Sosa, Kenneth J Smith
The deep and periventricular white matter is preferentially affected in several neurological disorders, including cerebral small vessel disease (SVD) and multiple sclerosis (MS), suggesting that common pathogenic mechanisms may be involved in this injury. Here we consider the potential pathogenic role of tissue hypoxia in lesion development, arising partly from the vascular anatomy of the affected white matter. Specifically, these regions are supplied by a sparse vasculature fed by long, narrow end arteries/arterioles that are vulnerable to oxygen desaturation if perfusion is reduced (as in SVD, MS and diabetes) or if the surrounding tissue is hypoxic (as in MS, at least)...
October 15, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29019794/vessel-calibre-and-flow-splitting-relationships-at-the-internal-carotid-artery-terminal-bifurcation
#2
Christophe Chnafa, Pierre Bouillot, Olivier Brina, Benedicte M A Delattre, Maria I Vargas, Karl-Olaf Lovblad, Vitor M Pereira, David A Steinman
Vessel lumen calibres and flow rates are thought to be related by mathematical power laws, reflecting the optimization of cardiac vs. metabolic work. While these laws have been confirmed indirectly via measurement of branch calibres, there is little data confirming power law relationships of flow distribution to branch calibres at individual bifurcations. Approach: Flow rates and diameters of parent and daughter vessels of the internal carotid artery terminal bifurcation were determined, via robust and automated methods, from 4D phase-contrast magnetic resonance imaging and 3D rotational angiography of 31 patients...
October 11, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/29018650/surgical-treatment-of-rotational-vertebral-artery-syndrome-induced-by-spinal-tumor-a-case-report-and-literature-review
#3
Shoichi Haimoto, Yusuke Nishimura, Masahito Hara, Yuu Yamamoto, Toshiki Fukuoka, Ryuichi Fukuyama, Toshihiko Wakabayashi, Howard J Ginsberg
Vertebrobasilar insufficiency (VBI) provoked by physiological head rotation is known as rotational vertebral artery syndrome (RVAS) or Bow Hunter syndrome. RVAS most often occurs at C1-2 level with head rotation and presents with symptoms of VBI. Several previously published studies have reported RVAS at subaxial sites (V2 segment), however, tumor-induced RVAS has never been reported. The authors report the first case of RVAS at V2 segment due to compression from a spinal tumor. A 71-year-old man presented with symptoms of dizziness provoked by head rotation or neck extension...
October 2017: NMC Case Rep J
https://www.readbyqxmd.com/read/28993752/histological-characteristics-of-intracranial-atherosclerosis-in-a-chinese-population-a-postmortem-study
#4
Wen Jie Yang, Mark Fisher, Lu Zheng, Chun Bo Niu, Annlia Paganini-Hill, Hai Lu Zhao, Yun Xu, Ka Sing Wong, Ho Keung Ng, Xiang Yan Chen
BACKGROUND: Anterior and posterior circulation atherosclerosis differ in vascular risk factors and stroke mechanisms. However, few studies have compared the pathological features between these lesions. Using a series of intracranial artery specimens, we characterized the intracranial atherosclerotic lesions and compared pathological features among different arteries of the intracranial vasculature. METHODS: Intracranial large arteries of 32 consecutively recruited autopsy cases of Chinese adults aged 45 years or older were examined pathologically using routine histology and immunostaining, to characterize the pathological features of the atherosclerotic lesions...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28987853/early-hemodynamic-changes-based-on-initial-color-coding-angiography-as-a-predictor-for-developing-subsequent-symptomatic-vasospasm-after-aneurysmal-sah
#5
Jan-Karl Burkhardt, Xiaolin Chen, Ethan A Winkler, Miriam Weiss, John Yue, Daniel L Cooke, Helen Kim, Michael T Lawton
INTRODUCTION: Prediction of vasospasm following aneurysmal subarachnoid hemorrhage (aSAH) remains imperfect and currently relies on clinical and radiographic characteristics. Whether early hemodynamic changes may refine risk stratification for delayed vasospasm (DV) after aSAH was analyzed. METHODS: Patients with aSAH (n=53) and a control of unruptured intracranial aneurysms (UIA) (n=12) with initial color-coding angiography at admission were included in this study (n=65)...
October 5, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28987841/severe-subarachnoid-hemorrhage-due-to-a-fusiform-lateral-anterior-a1-artery-perforator-aneurysm-with-spontaneous-resolution
#6
Gökce Hatipoglu Majernik, Elvis J Hermann, Christian Hartmann, Peter Raab, Joachim K Krauss
Perforating arteries are thin and long vessels which originate from the main cerebral arteries. Subarachnoidal hemorrhage from a perforator aneurysm is rare. Here, we report on a 70-year-old woman who presented with severe subarachnoid hemorrhage from a fusiform lateral anterior (A1) artery perforator aneurysm. Unexpectedly, digital subtraction angiography was non-diagnostic. MR imaging, however, demonstrated occlusion of the aneurysm secondary to thrombosis. Surgery was performed to remove the associated hematoma, and histopathological examination verified intraaneurysmal thrombosis...
October 5, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28986149/factors-associated-with-early-dramatic-recovery-following-successful-recanalization-of-occluded-artery-by-endovascular-treatment-in-anterior-circulation-stroke
#7
Dae-Hyun Kim, Hyun-Wook Nah, Hyun-Seok Park, Jae-Hyung Choi, Myung-Jin Kang, Jae-Kwan Cha
Endovascular treatment (EVT) significantly increases the recanalization rate and improves functional outcomes in acute ischemic stroke. However, despite successful recanalization by EVT, some stroke patients demonstrate no early dramatic recovery (EDR). We assessed factors associated with EDR following recanalization by EVT. We included subjects with anterior circulation stroke treated with EVT who met the following criteria: Thrombolysis in Cerebral Ischemia scores (TICI) 2b-3 after EVT, lesion volume <70mL as seen on the pre-treatment diffusion-weighted imaging (DWI) scan and a baseline NIHSS score ≥6...
October 3, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28983488/neurovascular-function-recovery-after-focal-ischemic-stroke-by-enhancing-cerebral-collateral-circulation-via-peripheral-stimulation-mediated-interarterial-anastomosis
#8
Han-Chi Pan, Lun-De Liao, Yu-Chun Lo, Jia-Wei Chen, Han-Lin Wang, Li Yang, Yao-Wen Liang, Po-Yu Huang, Ming-Hsun Yang, You-Yin Chen
Current treatments for ischemic stroke have focused on the administration of a tissue plasminogen activator, although the associated side effects and subsequent reperfusion injury remain challenging. Peripheral electrical stimulation has shed light on therapeutic interventions for ischemia by increasing cerebral blood flow (CBF) to the target region through collateral circulation, although the mechanism remains elusive. Here, a focal photothrombotic ischemic (PTI) stroke was induced in the right hemispheric primary somatosensory forelimb cortex (S1FL) of rat brains, and the therapeutic effects of forelimb and hindlimb stimulation were characterized at the contralesional S1FL...
July 2017: Neurophotonics
https://www.readbyqxmd.com/read/28983280/fatigue-and-cognitive-fatigability-in-mild-traumatic-brain-injury-are-correlated-with-altered-neural-activity-during-vigilance-test-performance
#9
Marika C Möller, Love Engström Nordin, Aniko Bartfai, Per Julin, Tie-Qiang Li
INTRODUCTION: Fatigue is the most frequently reported persistent symptom following a mild traumatic brain injury (mTBI), but the explanations for the persisting fatigue symptoms in mTBI remain controversial. In this study, we investigated the change of cerebral blood flow during the performance of a psychomotor vigilance task (PVT) by using pseudo-continuous arterial spin labeling (PCASL) MRI technique to better understand the relationship between fatigability and brain activity in mTBI...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28982784/clinical-and-imaging-characteristics-of-arteriopathy-subtypes-in-children-with-arterial-ischemic-stroke-results-of-the-vips-study
#10
M Wintermark, N K Hills, G A DeVeber, A J Barkovich, T J Bernard, N R Friedman, M T Mackay, A Kirton, G Zhu, C Leiva-Salinas, Q Hou, H J Fullerton
BACKGROUND AND PURPOSE: Childhood arteriopathies are rare but heterogenous, and difficult to diagnose and classify, especially by nonexperts. We quantified clinical and imaging characteristics associated with childhood arteriopathy subtypes to facilitate their diagnosis and classification in research and clinical settings. MATERIALS AND METHODS: The Vascular Effects of Infection in Pediatric Stroke (VIPS) study prospectively enrolled 355 children with arterial ischemic stroke (2010-2014)...
October 5, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28982294/the-effect-of-prenatal-alcohol-exposure-on-fetal-growth-and-cardiovascular-parameters-in-a-baboon-model-of-pregnancy
#11
Ana M Tobiasz, Jose R Duncan, Zoran Bursac, Ryan D Sullivan, Danielle L Tate, Alex M Dopico, Anna N Bukiya, Giancarlo Mari
Prenatal alcohol exposure often results in an array of fetal developmental abnormalities termed fetal alcohol spectrum disorders (FASDs). Despite the high prevalence of FASDs, the pathophysiology of fetal damage by alcohol remains poorly understood. One of the major obstacles in studying fetal development in response to alcohol exposure is the inability to standardize the amount, pattern of alcohol consumption, and peak blood alcohol levels in pregnant mothers. In the present study, we used Doppler ultrasonography to assess fetal growth and cardiovascular parameters in response to alcohol exposure in pregnant baboons...
January 1, 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28981977/reduced-cbf-recovery-detected-by-longitudinal-3d-ssp-spect-analyses-predicts-outcome-of-postoperative-patients-after-subarachnoid-hemorrhage
#12
Tatsushi Mutoh, Tomoko Totsune, Shunsuke Takenaka, Yasuko Tatewaki, Manabu Nakagawa, Jose Ignacio Suarez, Yasuyuki Taki, Tatsuya Ishikawa
The aim of this study was to evaluate the impact of cerebral blood flow (CBF) recovery obtained from brain single-photon emission computed tomography (SPECT) images on postoperative outcome after aneurysmal subarachnoid hemorrhage (SAH). Twenty-nine patients who had undergone surgical clipping for ruptured anterior communicating artery aneurysms were analyzed prospectively. Routine measurements of CBF were performed using technetium-99m hexamethyl propyleneamine oxine SPECT on days 4 and 14 after SAH. Regional voxel data analyzed by three dimensional stereotactic surface projection (3D-SSP) were compared between patients and age-matched normal database (NDB)...
October 5, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28978900/subarachnoid-aneurysmal-hemorrhage-associated-with-coarctation-of-the-aorta-case-report-and-review-of-the-literature
#13
Ryuta Nakae, Yu Fujiki, Shoji Yokobori, Yasutaka Naoe, Hiroyuki Yokota
Intracranial aneurysms (IAs) that undergo rupture causing subarachnoid hemorrhage (SAH), are common in young patients with coarctation of the aorta (CoA), but rarer in middle-aged and elderly patients. The pathogenesis of IAs associated with CoA remains unclear. We report the case of a 50-year-old woman who presented with SAH. On evaluation, six IAs were distributed among the anterior communicating artery (ACoA) (ruptured), distal segments of both anterior cerebral arteries (ACA), the left internal carotid artery (ICA), the bifurcation of the left middle cerebral artery (MCA)/MCA early branch, and the inferior trunk of the left MCA...
2017: Journal of Nippon Medical School, Nippon Ika Daigaku Zasshi
https://www.readbyqxmd.com/read/28973585/characteristics-of-unruptured-compared-to-ruptured-intracranial-aneurysms-a-multicenter-case-control-study
#14
Isabel C Hostettler, Varinder S Alg, Nichole Shahi, Fatima Jichi, Stephen Bonner, Daniel Walsh, Diederik Bulters, Neil Kitchen, Martin M Brown, Henry Houlden, Joan Grieve, David J Werring
BACKGROUND: Only a minority of intracranial aneurysms rupture to cause subarachnoid hemorrhage. OBJECTIVE: To test the hypothesis that unruptured aneurysms have different characteristics and risk factor profiles compared to ruptured aneurysms. METHODS: We recruited patients with unruptured aneurysms or aneurysmal subarachnoid hemorrhages at 22 UK hospitals between 2011 and 2014. Demographic, clinical, and imaging data were collected using standardized case report forms...
July 25, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28970078/evaluation-of-cerebral-arterial-and-venous-system-in-tuberculous-meningitis
#15
Jayantee Kalita, Rajesh K Singh, Usha K Misra, Sunil Kumar
BACKGROUND: Central nervous system infection especially pyogenic results in cerebral venous sinus thrombosis. Tuberculous meningitis (TBM) although associated with infarctions but there is no comprehensive study evaluating the role of CVST contributing in infarction. PURPOSE: To evaluate cerebral arterial and venous system using MR angiography (MRA) and MR venography (MRV) in TBM, and correlate with clinical and MRI findings. MATERIALS AND METHODS: Consecutive patients with TBM were evaluated clinically and their consciousness was assessed by using Glasgow Coma scale...
September 29, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/28967326/cerebral-blood-flow-after-mild-traumatic-brain-injury-associations-between-symptoms-and-post-injury-perfusion
#16
Jaclyn A Stephens, Peiying Liu, Hanzang Lu, Stacy J Suskauer
Arterial spin labeling (ASL) has emerged as a technique for assessing mild traumatic brain injury (mTBI), as it can non-invasively evaluate cerebrovascular physiology. To date, there is substantial variability in methodology and findings of ASL studies of mTBI. While both increased and decreased perfusion are reported after mTBI, more consistency is emerging when perfusion is examined with regard to symptomology. We evaluated 15 teenage athletes 2 and 6 weeks after sports-related concussion (SRC group) using pseudo-continuous ASL...
October 1, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28966817/association-of-travel-distance-and-cerebral-aneurysm-treatment
#17
Jian Guan, Michael Karsy, William T Couldwell, Richard H Schmidt, Philipp Taussky, Min S Park
BACKGROUND: The management of cerebral aneurysms requires a significant level of expertise, and large areas of the country have limited access to such advanced neurosurgical care. The objective of this study was to examine the impact of longer travel distance on aneurysm management. METHODS: Adult patients treated for cerebral aneurysms from January 1, 2013 to January 1, 2016, were retrospectively identified. Demographic data, socioeconomic data, aneurysm characteristics, and postoperative outcomes were evaluated with univariate and multivariable analysis to determine factors that influenced treatment prior to or after rupture...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28965156/decompressive-hemicraniectomy-for-malignant-middle-cerebral-artery-infarction-including-patients-with-additional-involvement-of-the-anterior-and-or-posterior-cerebral-artery-territory-outcome-analysis-and-definition-of-prognostic-factors
#18
Sven Kürten, Christopher Munoz, Kerim Beseoglu, Igor Fischer, Jason Perrin, Hans-Jakob Steiger
BACKGROUND: According to current evidence, adding decompressive craniectomy (DC) to best medical therapy reduces case fatality rate of malignant middle cerebral artery infarction by 50-75%. There is currently little information available regarding the outcome of subgroups, in particular of patients with extensive infarctions exceeding the territory of the middle cerebral artery. METHODS: The records of 101 patients with large hemispheric infarctions undergoing DC were retrospectively reviewed...
September 30, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28965106/safety-and-efficacy-of-aneurysm-treatment-with-web-in-the-cumulative-population-of-three-prospective-multicenter-series
#19
Laurent Pierot, Jacques Moret, Xavier Barreau, Istvan Szikora, Denis Herbreteau, Francis Turjman, Markus Holtmannspötter, Anne-Christine Januel, Vincent Costalat, Jens Fiehler, Joachim Klisch, Jean-Yves Gauvrit, Werner Weber, Hubert Desal, Stéphane Velasco, Thomas Liebig, Luc Stockx, Joachim Berkefeld, Andrew Molyneux, James Byrne, Laurent Spelle
BACKGROUND: Flow disruption with the WEB is an innovative endovascular approach for treatment of wide-neck bifurcation aneurysms. Initial studies have shown a low complication rate with good efficacy. PURPOSE: To report clinical and anatomical results of the WEB treatment in the cumulative population of three Good Clinical Practice (GCP) studies: WEBCAST (WEB Clinical Assessment of Intrasaccular Aneurysm), French Observatory, and WEBCAST-2. METHODS: WEBCAST, French Observatory, and WEBCAST-2 are single-arm, prospective, multicenter, GCP studies dedicated to the evaluation of WEB treatment...
September 30, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28962962/a-patient-with-a-recurrent-anterior-cerebral-artery-dissecting-aneurysm-after-stent-assisted-coil-embolization-successfully-treated-with-a3-a3-anastomosis
#20
Yoshiharu Takahashi, Hidenori Endo, Toshiki Endo, Miki Fujimura, Kuniyasu Niizuma, Teiji Tominaga
BACKGROUND: With recent advances in endovascular devices and techniques, the use of endovascular treatment has been reported for intracranial dissecting aneurysms. However, the efficacy of this endovascular approach for intracranial dissection is still unknown. We report the case of a patient with a recurrent anterior cerebral artery (ACA) dissecting aneurysm after endovascular treatment. CASE DESCRIPTION: A 67-year-old woman underwent stent-assisted coil embolization for a ruptured ACA dissecting aneurysm of the left A2 segment...
September 26, 2017: World Neurosurgery
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