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cerebral hyperperfusion

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https://www.readbyqxmd.com/read/28498060/correlation-between-reduction-in-microvascular-transit-time-after-superficial-temporal-artery-middle-cerebral-artery-bypass-surgery-for-moyamoya-disease-and-the-development-of-postoperative-hyperperfusion-syndrome
#1
Tao Yang, Yoshifumi Higashino, Hiroharu Kataoka, Eika Hamano, Daisuke Maruyama, Koji Iihara, Jun C Takahashi
OBJECTIVE Hyperperfusion syndrome (HPS) is a notable complication that causes various neurological symptoms after superficial temporal artery (STA)-middle cerebral artery (MCA) bypass surgery for moyamoya disease (MMD). The authors used intraoperative indocyanine green (ICG) videoangiography to measure the change in microvascular transit time (MVTT) after bypass surgery. An analysis was then conducted to identify the correlation between change in MVTT and presence of postoperative HPS. METHODS This study included 105 hemispheres of 81 patients with MMD who underwent STA-MCA single bypass surgery between January 2010 and January 2015...
May 12, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28492488/redistribution-of-cerebral-blood-flow-during-severe-hypovolemia-and-reperfusion-in-a-sheep-model-critical-role-of-%C3%AE-1-adrenergic-signaling
#2
René Schiffner, Sabine Juliane Bischoff, Thomas Lehmann, Florian Rakers, Sven Rupprecht, Juliane Reiche, Georg Matziolis, Harald Schubert, Matthias Schwab, Otmar Huber, Martin Schmidt
BACKGROUND: Maintenance of brain circulation during shock is sufficient to prevent subcortical injury but the cerebral cortex is not spared. This suggests area-specific regulation of cerebral blood flow (CBF) during hemorrhage. METHODS: Cortical and subcortical CBF were continuously measured during blood loss (≤50%) and subsequent reperfusion using laser Doppler flowmetry. Blood gases, mean arterial blood pressure (MABP), heart rate and renal blood flow were also monitored...
May 11, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28489576/intraoperative-contrast-enhanced-ultrasonography-for-microcirculatory-evaluation-in-rhesus-monkey-with-spinal-cord-injury
#3
Lin Huang, Keng Chen, Fu-Chao Chen, Hui-Yong Shen, Ji-Chao Ye, Zhao-Peng Cai, Xi Lin
This study tried to quantify spinal cord perfusion by using contrast-enhanced ultrasound (CEUS) in rhesus monkey models with acute spinal cord injury. Acute spinal cord perfusion after injury was detected by CEUS, coupling with conventional ultrasound (US) and Color Doppler US (CDFI). Time-intensity curves and perfusion parameters were obtained by autotracking contrast quantification (ACQ) software in the epicenter and adjacent regions of injury, respectively. Neurological and histological examinations were performed to confirm the severity of injury...
April 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/28458103/changes-in-the-interictal-and-early-postictal-diffusion-and-perfusion-magnetic-resonance-parameters-in-familial-spontaneous-epileptic-cats
#4
Yuji Hamamoto, Daisuke Hasegawa, Shunta Mizoguchi, Yoshihiko Yu, Masae Wada, Takayuki Kuwabara, Aki Fujiwara-Igarashi, Michio Fujita
OBJECTIVE: The familial spontaneous epileptic cat (FSEC) is thought to be a good genetic model of mesial temporal lobe epilepsy. In the current study, cerebral diffusion and perfusion magnetic resonance imaging (MRI) were used to confirm the functional deficit zone in the FSEC and evaluate the effect of a single seizure on different brain regions. METHODS: Six FSECs and six healthy control cats were used in this study. MRI was performed in the interictal state (resting state for control) and postictal state immediately after the vestibular stimulation-induced generalized epileptic seizure (control cats received the same stimulation as the FSECs)...
April 23, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28445296/a-case-of-cerebral-hyperperfusion-following-spontaneous-recanalization-of-occluded-middle-cerebral-artery-reperfusion-injury-or-true-cerebral-hyperperfusion-syndrome
#5
Ziqi Xu, Jiajia Zhou, Hui Liang, Benyan Luo, Ping Liu
BACKGROUND: Cerebral hyperperfusion syndrome (CHS) and reperfusion injury are distinct pathological phenomena. CASE SUMMARY: We present the case of a young ischemic stroke patient with middle cerebral artery (MCA) occlusion and spontaneous recanalization. Follow-up transcranial Doppler ultrasound showed high velocity flow in the left MCA, and neuroimaging revealed infarction, brain edema, artery dilatation, and hyperperfusion, consistent with both CHS and reperfusion injury...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28419949/characteristics-of-seizure-induced-signal-changes-on-mri-in-patients-with-first-seizures
#6
Si Eun Kim, Byung In Lee, Kyong Jin Shin, Sam Yeol Ha, JinSe Park, Kang Min Park, Hyung Chan Kim, Joonwon Lee, Soo-Young Bae, Dongah Lee, Sung Eun Kim
PURPOSE: The aim of this study was to investigate the predictive factors and identify the characteristics of the seizure-induced signal changes on MRI (SCM) in patients with first seizures. METHODS: We conducted a retrospective study of patients with first seizures from March 2010 to August 2014. The inclusion criteria for this study were patients with 1) first seizures, and 2) MRI and EEG performed within 24h of the first seizures. The definition of SCM was hyper-intensities in the brain not applying to cerebral arterial territories...
April 11, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28409735/quantitative-magnetic-resonance-angiography-as-a-potential-predictor-for-cerebral-hyperperfusion-syndrome-a-preliminary-study
#7
Lukas Andereggen, Sepideh Amin-Hanjani, Marwan El-Koussy, Rajeev K Verma, Kenya Yuki, Daniel Schoeni, Kety Hsieh, Jan Gralla, Gerhard Schroth, Juergen Beck, Andreas Raabe, Marcel Arnold, Michael Reinert, Robert H Andres
OBJECTIVE Cerebral hyperperfusion syndrome (CHS) is a rare but devastating complication of carotid endarterectomy (CEA). This study sought to determine whether quantitative hemodynamic assessment using MR angiography can stratify CHS risk. METHODS In this prospective trial, patients with internal carotid artery (ICA) stenosis were randomly selected for pre- and postoperative quantitative phase-contrast MR angiography (QMRA). Assessment was standardized according to a protocol and included Doppler/duplex sonography, MRI, and/or CT angiography and QMRA of the intra- and extracranial supplying arteries of the brain...
April 14, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28368507/prediction-of-cerebral-hyperperfusion-after-carotid-artery-stenting-by-cerebral-angiography-and-single-photon-emission-computed-tomography-without-acetazolamide-challenge
#8
Tsuyoshi Ohta, Ichiro Nakahara, Shoji Matsumoto, Ryota Ishibashi, Haruka Miyata, Hidehisa Nishi, Sadayoshi Watanabe, Izumi Nagata
BACKGROUND: Definitive preoperative predictors of cerebral hyperperfusion following carotid artery stenting are yet to be established. OBJECTIVE: To determine the preprocedural risk factors for cerebral hyperperfusion phenomenon (CHP) following carotid artery stenting. METHODS: Patients undergoing preprocedural single-photon emission computed tomography (SPECT) and cerebral angiography prior to their first carotid artery stenting were monitored for occurrence of CHP...
March 29, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28359924/prolonged-cerebral-hyperperfusion-and-subcortical-low-intensity-on-fluid-attenuated-inversion-recovery-images-unusual-manifestation-after-removal-of-organized-chronic-subdural-hematoma
#9
Satoru Tanioka, Yu Sato, Kazuhiko Tsuda, Shigehiko Niwa, Hidenori Suzuki
BACKGROUND: Cerebral hyperperfusion sometimes occurs after removal of chronic subdural hematoma (CSH) and usually resolves within a few days without any symptoms. Subcortical low intensity (SCLI) on fluid-attenuated inversion recovery (FLAIR) magnetic resonance images is rare and has been reported in some diseases other than CSH. A case of organized CSH who suffered prolonged neurologic deterioration, SCLI, and cerebral hyperperfusion postoperatively is described. CASE DESCRIPTION: An 81-year-old man, presenting with left hemiparesis, underwent craniotomy for right organized CSH after 2 burr-hole surgeries...
May 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28357585/uneven-cerebral-hemodynamic-change-as-a-cause-of-neurological-deterioration-in-the-acute-stage-after-direct-revascularization-for-moyamoya-disease-cerebral-hyperperfusion-and-remote-ischemia-caused-by-the-watershed-shift
#10
Xian-Kun Tu, Miki Fujimura, Sherif Rashad, Shunji Mugikura, Hiroyuki Sakata, Kuniyasu Niizuma, Teiji Tominaga
Superficial temporal artery-middle cerebral artery (STA-MCA) anastomosis is the standard surgical treatment for moyamoya disease (MMD). The main potential complications of this treatment are cerebral hyperperfusion (CHP) syndrome and ischemia, and their managements are contradictory to each other. We retrospectively investigated the incidence of the simultaneous manifestation of CHP and infarction after surgery for MMD. Of the 162 consecutive direct revascularization surgeries performed for MMD, we encountered two adult cases (1...
March 29, 2017: Neurosurgical Review
https://www.readbyqxmd.com/read/28357141/intrahemispheric-perfusion-in-chronic-stroke-induced-aphasia
#11
Cynthia K Thompson, Matthew Walenski, YuFen Chen, David Caplan, Swathi Kiran, Brenda Rapp, Kristin Grunewald, Mia Nunez, Richard Zinbarg, Todd B Parrish
Stroke-induced alterations in cerebral blood flow (perfusion) may contribute to functional language impairments and recovery in chronic aphasia. Using MRI, we examined perfusion in the right and left hemispheres of 35 aphasic and 16 healthy control participants. Across 76 regions (38 per hemisphere), no significant between-subjects differences were found in the left, whereas blood flow in the right was increased in the aphasic compared to the control participants. Region-of-interest (ROI) analyses showed a varied pattern of hypo- and hyperperfused regions across hemispheres in the aphasic participants; however, there were no significant correlations between perfusion values and language abilities in these regions...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/28336553/tlr2-knockout-protects-against-diabetes-mediated-changes-in-cerebral-perfusion-and-cognitive-deficits
#12
Trevor Hardigan, Caterina Hernandez, Rebecca Ward, M Nasrul Hoda, Adviye Ergul
The risk of cognitive decline in diabetes (Type 1 and Type 2) is significantly greater compared to normoglycemic patients, and the risk of developing dementia in diabetic patients is doubled. The etiology for this is likely multifactorial, but one mechanism that has gained increasing attention is decreased cerebral perfusion as a result of cerebrovascular dysfunction. The innate immune system has been shown to play a role in diabetic vascular complications, notably through Toll-like receptor (TLR) stimulated release of pro-inflammatory cytokines and chemokines that leads to vascular damage...
February 22, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28323181/perioperative-changes-in-cerebral-perfusion-territories-assessed-by-arterial-spin-labeling-magnetic-resonance-imaging-are-associated-with-postoperative-increases-in-cerebral-blood-flow-in-patients-with-carotid-stenosis
#13
Daisuke Yamamoto, Kohkichi Hosoda, Yoshito Uchihashi, Atsushi Fujita, Takashi Sasayama, Masahiko Fujii, Kazuro Sugimura, Masaaki Kohta, Eiji Kohmura
OBJECTIVE: MRI technique known as Territorial ASL (TASL) allows for noninvasive visualization of their perfusion territories. The objective of this study was to use TASL to assess the relationship between perioperative changes in the perfusion territories of ICA and CBF after carotid revascularization. METHODS: In 32 patients, ICA perfusion volume (PV) and CBF were measured before and after CEA/CAS using TASL and SPECT, respectively. ICA flow was measured during CEA before and after reconstruction, using an electromagnetic flowmeter...
March 16, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28297066/cerebral-hyperperfusion-and-other-consequences-of-hemodialysis-central-vein-catheters
#14
Haimanot Wasse
While central venous stenosis is a common consequence of protracted central venous catheter use, intracardiac device transvenous leads, and central venous instrumentation, the majority of patients who develop symptomatic central venous stenosis present with characteristic venous hypertension. However, some patients may develop an abnormal intracranial venous circulation and present with neurologic symptoms. This paper will summarize findings from case reports that describe the neurologic sequelae that can develop as a result of central venous stenosis/occlusion in end-stage renal disease patients with a functional arteriovenous access...
March 6, 2017: Journal of Vascular Access
https://www.readbyqxmd.com/read/28291816/identification-of-cerebral-perfusion-using-arterial-spin-labeling-in-patients-with-seizures-in-acute-settings
#15
Roh-Eul Yoo, Tae Jin Yun, Byung-Woo Yoon, Sang Kun Lee, Soon-Tae Lee, Koung Mi Kang, Seung Hong Choi, Ji-Hoon Kim, Chul-Ho Sohn, Sun-Won Park, Moon Hee Han
This study aimed to explore the utility of arterial spin labeling perfusion-weighted imaging (ASL-PWI) in patients with suspected seizures in acute settings. A total of 164 patients who underwent ASL-PWI for suspected seizures in acute settings (with final diagnoses of seizure [n = 129], poststroke seizure [n = 18], and seizure mimickers [n = 17]), were included in this retrospective study. Perfusion abnormality was analyzed for: (1) pattern, (2) multifocality, and (3) atypical distribution against vascular territories...
2017: PloS One
https://www.readbyqxmd.com/read/28268070/post-carotid-endarterectomy-hypertension-part-1-association-with-pre-operative-clinical-imaging-and-physiological-parameters
#16
J E Newman, M J Bown, R D Sayers, J P Thompson, T G Robinson, B Williams, R Panerai, P Lacy, A R Naylor
OBJECTIVE/BACKGROUND: Post-endarterectomy hypertension (PEH) is a well recognised, but poorly understood, phenomenon after carotid endarterectomy (CEA) that is associated with post-operative intracranial haemorrhage, hyperperfusion syndrome, and cardiac complications. The aim of the current study was to identify pre-operative clinical, imaging, and physiological parameters associated with PEH. METHODS: In total, 106 CEA patients undergoing CEA under general anaesthesia underwent pre-operative evaluation of 24 hour ambulatory arterial blood pressure (BP), baroreceptor sensitivity, cerebral autoregulation, and transcranial Doppler measurement of cerebral blood flow velocity (CBFv) and pulsatility index...
March 3, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28258019/open-and-endovascular-management-of-severe-cerebral-ischemia-in-takayasu-s-arteritis
#17
Xiao Yun Luo, Qing Hua Wu, Fu Xian Zhang
BACKGROUND: Severe cerebral ischemia in patients with Takayasu's arteries was caused by occlusion of most supra-aortic arteries. Arterial revascularization is necessary to decrease the incidence of stroke and improve the quality of life but may be complicated with multiple occlusive lesions and inflammation condition of this disease. This study was to assess options and long-term outcomes of surgical and endovascular treatment. METHODS: Twenty-nine patients with severe cerebral ischemic symptoms underwent surgical or endovascular treatment from January 1991 to July 2015...
March 1, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28190436/neurologic-complications-of-cardiac-and-vascular-surgery
#18
REVIEW
K N Sheth, E Nourollahzadeh
This chapter will provide an overview of the major neurologic complications of common cardiac and vascular surgeries, such as coronary artery bypass grafting and carotid endarterectomy. Neurologic complications after cardiac and vascular surgeries can cause significant morbidity and mortality, which can negate the beneficial effects of the intervention. Some of the complications to be discussed include ischemic and hemorrhagic stroke, seizures, delirium, cognitive dysfunction, cerebral hyperperfusion syndrome, cranial nerve injuries, and peripheral neuropathies...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/28186430/cerebral-blood-flow-frontal-lobe-oxygenation-and-intra-arterial-blood-pressure-during-sprint-exercise-in-normoxia-and-severe-acute-hypoxia-in-humans
#19
David Curtelin, David Morales-Alamo, Rafael Torres-Peralta, Peter Rasmussen, Marcos Martin-Rincon, Mario Perez-Valera, Christoph Siebenmann, Ismael Pérez-Suárez, Evgenia Cherouveim, A William Sheel, Carsten Lundby, José Al Calbet
Cerebral blood flow (CBF) is regulated to secure brain O2 delivery while simultaneously avoiding hyperperfusion; however, both requisites may conflict during sprint exercise. To determine whether brain O2 delivery or CBF is prioritized, young men performed sprint exercise in normoxia and hypoxia (PIO2 = 73 mmHg). During the sprints, cardiac output increased to ∼22 L min(-1), mean arterial pressure to ∼131 mmHg and peak systolic blood pressure ranged between 200 and 304 mmHg. Middle-cerebral artery velocity (MCAv) increased to peak values (∼16%) after 7...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28153617/the-susceptibility-pathogenesis-of-moyamoya-disease
#20
REVIEW
Juntao Hu, Jie Luo, Qianxue Chen
Moyamoya disease (MMD) is a cerebrovascular disease characterized by progressive stenosis of the intracranial internal carotid arteries and their proximal branches. Epidemiologically, MMD is more prevalent in East Asia than any other region worldwide, and has been estimated at 0.94 per 100,000 in the Japanese and 0.43 per 100,000 in the Chinese population. The etiology of this rare disease, however, remains unknown. Regarding biomarkers, MMD is characterized by an increased expression of angiogenic factors and proinflammatory molecules such as vascular endothelial growth factors and matrix metalloproteinase-9, which may partly explain its clinical manifestations of the pathologic angiogenesis, spontaneous hemorrhage, and greater incidence of cerebral hyperperfusion after revascularization surgery...
May 2017: World Neurosurgery
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