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cerebral hyperperfusion

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https://www.readbyqxmd.com/read/29786833/assessment-of-cerebral-perfusion-and-edema-in-preeclampsia-with-intravoxel-incoherent-motion-mri
#1
Maria Nelander, Daniel Hannsberger, Inger Sundström-Poromaa, Lina Bergman, Jan Weis, Helena Åkerud, Johan Wikström, Anna-Karin Wikström
INTRODUCTION: Cerebral complications are the main reasons for morbidity and mortality in preeclampsia and eclampsia. Still we do not know if the pathophysiology entails hypo- or hyperperfusion of the brain, or how and when edema emerges, due to the difficulty to examine the cerebral circulation. MATERIAL AND METHODS: We have used a non-invasive diffusion weighted magnetic resonance imaging (MRI) technique, intravoxel incoherent motion, to study cerebral perfusion on the capillary level and cerebral edema in women with preeclampsia (n=30), normal pregnancy (n=32) and non-pregnant women (n=16)...
May 22, 2018: Acta Obstetricia et Gynecologica Scandinavica
https://www.readbyqxmd.com/read/29760312/change-in-cerebral-blood-flow-after-palliative-percutaneous-angioplasty-and-timing-of-second-stage-carotid-artery-stenting-in-staged-angioplasty
#2
Hisashi Nagashima, Kazuhiro Hongo, Alhusain Nagm
The purpose of this study is to elucidate the hemodynamic changes after palliative angioplasty and the timing of second stage carotid artery stenting (CAS) in staged angioplasty for patients with severe hemodynamically compromised carotid artery stenosis. Among consecutive 111 patients with carotid artery stenosis, chronological changes in the cerebral blood flow of all 11 hemodynamically compromised patients treated with CAS were evaluated with single photon emission computed tomogram (SPECT) in each stage of the treatment...
May 11, 2018: Neurologia Medico-chirurgica
https://www.readbyqxmd.com/read/29757425/four-dimensional-flow-mri-analysis-of-cerebral-blood-flow-before-and-after-high-flow-extracranial-intracranial-bypass-surgery-with-internal-carotid-artery-ligation
#3
Erika Orita, Yasuo Murai, Tetsuro Sekine, Ryo Takagi, Yasuo Amano, Takahiro Ando, Kotomi Iwata, Makoto Obara, Shinichiro Kumita
BACKGROUND: The hemodynamic changes that occur after high-flow (extracranial-intracranial) EC-IC bypass surgery with internal carotid artery (ICA) ligation are not well known. OBJECTIVE: To assess blood flow changes after high-flow EC-IC bypass with ICA ligation by time-resolved 3-dimensional phase-contrast (4D Flow) magnetic resonance imaging (MRI). METHODS: We enrolled 11 patients who underwent high-flow EC-IC bypass. 4D Flow MRI was performed before and after surgery to quantify the blood flow volume (BFV) of the ipsilateral ICA (BFViICA), bypass artery (BFVbypass), contralateral ICA (BFVcICA), and basilar artery (BFVBA)...
May 11, 2018: Neurosurgery
https://www.readbyqxmd.com/read/29729468/the-angiography-of-cervical-carotid-plaque-rupture-due-to-percutaneus-transluminal-balloon-arterioplasty
#4
Tomoya Omae, Naomoto Senbokuya, Toshiharu Yanagisawa
The authors describe the rare imaging of plaque rupture at cervical internal carotid artery stenosis after balloon-arterioplasty. The patient was 82 year-old male who was complained of lt. hemiparesis. Magnetic Resonance imaging-diffusion weight imaging revealed multiple high signal intensity at rt. cerebral hemisphere. Magnetic Resonance angiography showed severe stenosis at cervical internal carotid artery. We considered high risk of hyperperfusion syndrome after revascularization. We planned staged angioplasty...
May 2, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29726017/effect-of-cerebral-flow-autoregulation-function-on-cerebral-flow-rate-under-continuous-flow-left-ventricular-assist-device-support
#5
Selim Bozkurt
Neurological complications in continuous flow left ventricular assist device (CF-LVAD) patients are the second-leading risk of death after multi-organ failure. They are associated with altered blood flow in the cardiovascular system because of CF-LVAD support. Moreover, an impaired cerebral autoregulation function may also contribute to complications such as hyperperfusion in the cerebral circulation under mechanical circulatory support. The aim of this study is to evaluate the effect of cerebral autoregulatory function on cerebral blood flow rate under CF-LVAD support...
May 3, 2018: Artificial Organs
https://www.readbyqxmd.com/read/29689406/hyperperfusion-syndrome-after-trapping-with-high-flow-bypass-for-a-giant-paraclinoid-internal-carotid-artery-aneurysm
#6
Masanao Mohri, Toshiya Ichinose, Naoyuki Uchiyama, Kouichi Misaki, Iku Nambu, Yasushi Takabatake, Mitsutoshi Nakada
BACKGROUND: Hyperperfusion syndrome associated with aneurysm surgery is rare. The occurrence of the syndrome after trapping with high-flow bypass has not been described previously. Herein, we present a case of the syndrome occurring after trapping with high-flow bypass of an unruptured giant paraclinoid internal carotid artery (ICA) aneurysm. CASE DESCRIPTION: The patient was a 68-year-old woman with progressive loss of vision in her left eye. After a diagnosis of a left giant ICA aneurysm, she underwent successful trapping with high-flow bypass...
April 21, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29685407/staged-carotid-artery-stenting-in-patients-with-severe-carotid-stenosis-multicenter-experience
#7
Dong Hyun Yoo, Hong Gee Roh, See-Sung Choi, Jusun Moon, Jeongjun Lee, Young Dae Cho, Moon Hee Han, Keun-Hwa Jung, Byung-Woo Yoon, Hyun-Seung Kang
Cerebral hyperperfusion syndrome (CHS) is serious complication after carotid artery stenting (CAS) caused by decreased cerebral vasoreactivity (CVR) due to long standing hypoperfusion of the brain. We hypothesized that partial dilatation of carotid stenosis would allow the recovery of CVR, and prevent CHS when definitive angioplasty with stent is performed afterward. In this study, we aimed to evaluate the safety and efficacy of staged CAS in patients with severe carotid artery stenosis with evident hemodynamic compromise in regard to preventing hyperperfusion syndrome...
April 20, 2018: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29677060/cerebral-small-vessel-but-not-large-vessel-disease-is-associated-with-impaired-cerebral-autoregulation-during-cardiopulmonary-bypass-a-retrospective-cohort-study
#8
Yohei Nomura, Roland Faegle, Daijiro Hori, Abbas Al-Qamari, Alexander J Nemeth, Rebecca Gottesman, Gayane Yenokyan, Charles Brown, Charles W Hogue
BACKGROUND: Impaired cerebral blood flow (CBF) autoregulation during cardiopulmonary bypass (CPB) is associated with stroke and other adverse outcomes. Large and small arterial stenosis is prevalent in patients undergoing cardiac surgery. We hypothesize that large and/or small vessel cerebral arterial disease is associated with impaired cerebral autoregulation during CPB. METHODS: A retrospective cohort analysis of data from 346 patients undergoing cardiac surgery with CPB enrolled in an ongoing prospectively randomized clinical trial of autoregulation monitoring were evaluated...
April 17, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29668855/the-negative-ultraslow-potential-electrophysiological-correlate-of-infarction-in-the-human-cortex
#9
Janos Lückl, Coline L Lemale, Vasilis Kola, Viktor Horst, Uldus Khojasteh, Ana I Oliveira-Ferreira, Sebastian Major, Maren K L Winkler, Eun-Jeung Kang, Karl Schoknecht, Peter Martus, Jed A Hartings, Johannes Woitzik, Jens P Dreier
Spreading depolarizations are characterized by abrupt, near-complete breakdown of the transmembrane ion gradients, neuronal oedema, mitochondrial depolarization, glutamate excitotoxicity and activity loss (depression). Spreading depolarization induces either transient hyperperfusion in normal tissue; or hypoperfusion (inverse coupling = spreading ischaemia) in tissue at risk for progressive injury. The concept of the spreading depolarization continuum is critical since many spreading depolarizations have intermediate characteristics, as opposed to the two extremes of spreading depolarization in either severely ischaemic or normal tissue...
April 16, 2018: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29663353/positron-emission-tomography-imaging-of-cerebral-glucose-metabolism-and-type-1-cannabinoid-receptor-availability-during-temporal-lobe-epileptogenesis-in-the-amygdala-kindling-model-in-rhesus-monkeys
#10
Evy Cleeren, Cindy Casteels, Karolien Goffin, Michel Koole, Koen Van Laere, Peter Janssen, Wim Van Paesschen
OBJECTIVE: We investigated changes in the endocannabinoid system and glucose metabolism during temporal lobe epileptogenesis. METHODS: Because it is rarely possible to study epileptogenesis in humans, we applied the electrical amygdala kindling model in nonhuman primates to image longitudinal changes in type 1 cannabinoid receptor (CB1R) binding and cerebral glucose metabolism. Two rhesus monkeys received [18 F]-MK-9470 and fluorodeoxyglucose-positron emission tomography ([18 F]-FDG -PET) scans in each of the 4 kindling stages to quantify relative changes over time of CB1R binding and cerebral glucose metabolism in vivo...
April 17, 2018: Epilepsia
https://www.readbyqxmd.com/read/29629988/early-evidence-of-sepsis-associated-hyperperfusion-a-study-of-cerebral-blood-flow-measured-with-mri-arterial-spin-labeling-in-critically-ill-septic-patients-and-control-subjects
#11
Marie-Hélène Masse, Marie Anne Richard, Frédérick D'Aragon, Charles St-Arnaud, Michael Mayette, Neill K J Adhikari, William Fraser, André Carpentier, Steven Palanchuck, David Gauthier, Luc Lanthier, Matthieu Touchette, Albert Lamontagne, Jean Chénard, Sangeeta Mehta, Yanick Sansoucy, Etienne Croteau, Martin Lepage, François Lamontagne
OBJECTIVES: Mechanisms underlying sepsis-associated encephalopathy remain unclear, but reduced cerebral blood flow, alone or in conjunction with altered autoregulation, is reported as a potential contributor. We compared cerebral blood flow of control subjects and vasopressor-dependent septic patients. DESIGN: Randomized crossover study. SETTING: MRI with arterial spin labeling. PATIENTS: Ten sedated septic patients on mechanical ventilation (four with controlled chronic hypertension) and 12 control subjects (six with controlled chronic hypertension) were enrolled...
April 6, 2018: Critical Care Medicine
https://www.readbyqxmd.com/read/29626683/assessment-of-hemodynamic-changes-and-hyperperfusion-risk-following-extracranial-to-intracranial-bypass-surgery-using-intraoperative-indocyanine-green-based-flow-analysis
#12
Robert C Rennert, Ben A Strickland, Kristina Ravina, Joshua Bakhsheshian, Jonathan J Russin
BACKGROUND: Intra-operative blood flow assessments during cerebral bypass would ideally assess vessel patency, downstream perfusion, and risk of post-operative hyperperfusion syndrome (HPS). Previous studies using Indocyanine Green-based flow analyses (ICG-BFA) have identified multiple parameters that can intra-operatively track bypass-related changes in cerebral perfusion and potentially predict post-operative HPS risk. Herein, we determine the most robust parameter and anatomic location for intra-operative ICG-BFA assessment of bypass-related perfusion changes and prediction of post-operative HPS risk...
April 4, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29610036/paradoxical-association-of-symptomatic-local-vasogenic-edema-with-global-cerebral-hypoperfusion-after-direct-revascularization-surgery-for-adult-moyamoya-disease
#13
Ryosuke Tashiro, Miki Fujimura, Shunji Mugikura, Kuniyasu Niizuma, Hidenori Endo, Toshiki Endo, Teiji Tominaga
BACKGROUND: Superficial temporal artery-middle cerebral artery (STA-MCA) anastomosis is the standard treatment for Moyamoya disease (MMD). Cerebral hyperperfusion syndrome is a potential complication of this procedure and can cause local vasogenic edema and/or delayed intracerebral hemorrhage. Cerebral hypoperfusion is a contradictory postoperative pathophysiological condition implicated in MMD, but its association with symptomatic local vasogenic edema has not been reported. CASE REPORT: A 31-year-old woman with MMD underwent left STA-MCA anastomosis 3 months after a minor completed stroke in bilateral hemispheres...
March 30, 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/29600916/risk-factors-for-and-outcomes-of-postoperative-complications-in-adult-patients-with-moyamoya-disease
#14
Meng Zhao, Xiaofeng Deng, Dong Zhang, Shuo Wang, Yan Zhang, Rong Wang, Jizong Zhao
OBJECTIVE The risk factors and clinical significance of postoperative complications in moyamoya disease are still unclear. The aim of this study was to investigate the predictors of postoperative complications in moyamoya disease and examine the impact of complications on outcomes. METHODS The authors reviewed consecutive cases involving adult moyamoya disease patients who underwent indirect, direct, or combined bypass surgery in their hospital between 2009 and 2015. Preoperative clinical characteristics and radiographic features were recorded...
March 30, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29571862/emergent-carotid-artery-stenting-in-atherosclerotic-disease-of-the-internal-carotid-artery-with-tandem-intracranial-occlusion
#15
Marta Rodrigues, André Cunha, Sofia Figueiredo, Andreia Carvalho, Miguel Veloso, Pedro Barros, Tiago Gregório, Ludovina Paredes, João Pinho, Sérgio Castro, Manuel Ribeiro
BACKGROUND: Several randomized clinical trials have proven the safety and efficacy of mechanical thrombectomy (MT) in large vessel occlusions; nonetheless, there is still no consensus concerning hyperacute management of tandem occlusions. Recent studies have suggested that emergent carotid artery stenting (eCAS), along with mechanical thrombectomy, is an effective and safe treatment option. AIMS: To characterize the safety and short-term outcome of patients treated with eCAS during endovascular treatment of acute ischaemic stroke...
April 15, 2018: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29563211/cortical-blindness-as-a-rare-presentation-of-hemorrhagic-cerebral-hyperperfusion-syndrome-following-vertebral-angioplasty
#16
Chao Fu, Zhongxin Xu, Zhenzhen Hu, Shuai Yao, Fengmin Liu, Baiqi Feng, Conghai Zhao, Weidong Yu
Cerebral hyperperfusion syndrome (CHS) is a well-documented complication after carotid endarterectomy or stenting. In contrast, CHS following vertebral revascularization is extremely rare. Here we present a case of a 77-year-old man with high-grade vertebral stenosis who subsequently underwent balloon angioplasty, complicated by hemorrhagic CHS manifesting as cortical blindness, although strict postoperative blood pressure control was administered. To our knowledge, cortical blindness as a presentation of hemorrhagic CHS has not previously been reported...
March 21, 2018: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29556806/cerebral-hyperperfusion-syndrome-after-carotid-revascularization-and-acute-ischemic-stroke
#17
REVIEW
Kathryn F Kirchoff-Torres, Ekaterina Bakradze
PURPOSE OF REVIEW: Cerebral hyperperfusion syndrome (CHS) is a rare but significant complication after carotid revascularization and is increasingly recognized after acute stroke treatments. In this review, we discuss the epidemiology and pathophysiology of CHS, clinical presentation including ipsilateral headache, seizures, and focal neurological deficits, and radiographic presentation. We propose preventive therapies with emphasis on acute stroke post-thrombectomy hyperperfusion. RECENT FINDINGS: CHS was first described after carotid revascularization but is now also reported in patients with acute ischemic stroke...
March 19, 2018: Current Pain and Headache Reports
https://www.readbyqxmd.com/read/29550191/successful-hemispherotomy-in-two-refractory-epilepsy-patients-with-cerebral-hemiatrophy-and-contralateral-eeg-abnormalities
#18
Rumiko Takayama, Katsumi Imai, Hiroko Ikeda, Koichi Baba, Naotaka Usui, Yukitoshi Takahashi, Yushi Inoue
We describe two cases of refractory epilepsy with cerebral hemiatrophy and contralateral electroencephalographic (EEG) abnormalities, in which hemispherotomy of the atrophic hemisphere effectively controlled seizures. Case 1 was a 5-year-1-month-old girl with refractory bilateral asymmetrical tonic posturing seizures predominantly in the right arm. Magnetic resonance imaging showed left porencephaly corresponding to a left middle cerebral artery infarction. Case 2 was a 3-year-8-month-old boy with refractory bilateral asymmetrical tonic posturing seizures predominantly in the right arm due to atrophy of the left cerebral hemisphere after septic meningitis...
March 14, 2018: Brain & Development
https://www.readbyqxmd.com/read/29547088/usefulness-of-the-convexity-apparent-hyperperfusion-sign-in-123-i-iodoamphetamine-brain-perfusion-spect-for-the-diagnosis-of-idiopathic-normal-pressure-hydrocephalus
#19
Takuma Ohmichi, Masaki Kondo, Masahiro Itsukage, Hidetaka Koizumi, Shigenori Matsushima, Nagato Kuriyama, Kazunari Ishii, Etsuro Mori, Kei Yamada, Toshiki Mizuno, Takahiko Tokuda
OBJECTIVE The gold standard for the diagnosis of idiopathic normal pressure hydrocephalus (iNPH) is the CSF removal test. For elderly patients, however, a less invasive diagnostic method is required. On MRI, high-convexity tightness was reported to be an important finding for the diagnosis of iNPH. On SPECT, patients with iNPH often show hyperperfusion of the high-convexity area. The authors tested 2 hypotheses regarding the SPECT finding: 1) it is relative hyperperfusion reflecting the increased gray matter density of the convexity, and 2) it is useful for the diagnosis of iNPH...
March 16, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29530706/cerebral-hyperperfusion-syndrome-after-revascularization-surgery-in-moyamoya-disease-region-symptom-mapping-and-estimating-a-critical-threshold
#20
Ken Kazumata, Haruto Uchino, Kikutaro Tokairin, Masaki Ito, Tohru Shiga, Toshiya Osanai, Masahito Kawabori
BACKGROUND: Cerebral hyperperfusion complicates the postoperative course of patients with moyamoya disease after direct revascularization surgery. There is no clear distinction between cerebral hyperperfusion syndrome and benign postoperative increase in regional cerebral blood flow (rCBF). OBJECTIVE: The present study aimed to determine clinically relevant changes in rCBF, anatomical correlations, and factors associated with transient neurologic symptoms after revascularization surgery in moyamoya disease...
March 10, 2018: World Neurosurgery
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