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https://www.readbyqxmd.com/read/27909265/prevention-of-the-collapse-of-pial-collaterals-by-remote-ischemic-perconditioning-during-acute-ischemic-stroke
#1
Junqiang Ma, Yonglie Ma, Bin Dong, Mischa V Bandet, Ashfaq Shuaib, Ian R Winship
Collateral circulation is a key variable determining prognosis and response to recanalization therapy during acute ischemic stroke. Remote ischemic perconditioning (RIPerC) involves inducing peripheral ischemia (typically in the limbs) during stroke and may reduce perfusion deficits and brain damage due to cerebral ischemia. In this study, we directly investigated pial collateral flow augmentation due to RIPerC during distal middle cerebral artery occlusion (MCAo) in rats. Blood flow through pial collaterals between the anterior cerebral artery (ACA) and the MCA was assessed in male Sprague Dawley rats using in vivo laser speckle contrast imaging (LSCI) and two photon laser scanning microscopy (TPLSM) during distal MCAo...
December 1, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27888269/internal-carotid-artery-pseudoaneurysm-and-ischemic-stroke-secondary-to-retropharyngeal-and-parapharyngeal-abscess-a-case-report-and-review-of-the-literature
#2
Michael W Ruff, Deena M Nasr, James P Klaas, Deborah L Renaud
Internal carotid artery pseudoaneurysm is an uncommon complication of retropharyngeal and parapharyngeal abscess in children. Treatment of the pseudoaneurysm has evolved in recent years from surgical ligation to endovascular techniques. Neurologic sequelae most commonly consist of Horner's syndrome with cerebral ischemia being uncommon. The clinical course of a 2-year-old boy with retropharyngeal abscess complicated by internal carotid artery pseudoaneurysm, is described and the literature is reviewed. A conventional angiogram confirmed the presence of a large pseudoaneurysm with no anterograde flow distal to the pseudoaneurysm and substantial collateral flow across the circle of Willis, with filling of the left anterior and middle cerebral arteries via the anterior and posterior communicating arteries...
November 25, 2016: Journal of Child Neurology
https://www.readbyqxmd.com/read/27859886/collateral-blood-flow-in-different-cerebrovascular-hierarchy-provides-endogenous-protection-in-cerebral-ischemia
#3
Chuanming Luo, Fengyin Liang, Huixia Ren, Xiaoli Yao, Qiang Liu, Mingyue Li, Dajiang Qin, Ti-Fei Yuan, Zhong Pei, Huanxing Su
Collateral blood flow as vascular adaptions to focal cerebral ischemia is well recognized. However, few studies directly investigate the dynamics of collateral vessel recruitment in vivo and little is known about the effect of collateral blood flow in different cerebrovascular hierarchy on the neuropathology after focal ischemic stroke. Here, we report that collateral blood flow is critically involved in blood vessel compensations following regional ischemia. We occluded a pial arteriole using femtosecond laser ablating under the intact thinned skull and documented the changes of collateral flow around the surface communication network and between the surface communication network and subsurface microcirculation network using in vivo two photon microscopy imaging...
November 15, 2016: Brain Pathology
https://www.readbyqxmd.com/read/27856435/impact-of-pial-collaterals-on-infarct-growth-rate-in-experimental-acute-ischemic-stroke
#4
G A Christoforidis, P Vakil, S A Ansari, F H Dehkordi, T J Carroll
BACKGROUND AND PURPOSE: Cerebral infarction evolves at different rates depending on available blood flow suggesting that treatment time windows vary depending on the degree of pial collateral recruitment. This work sought to mathematically model infarct growth and determine whether infarct volume growth can be predicted by angiographic assessment of pial collateral recruitment in an experimental MCA occlusion animal model. MATERIALS AND METHODS: Pial collateral recruitment was quantified by using DSA, acquired 15 minutes following permanent MCA occlusion in 6 canines based on a scoring system (average pial collateral score) and arterial arrival time...
November 17, 2016: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/27856113/clinical-outcome-predicted-by-collaterals-depends-on-technical-success-of-mechanical-thrombectomy-in-middle-cerebral-artery-occlusion
#5
Alexandra S Gersing, Benedikt J Schwaiger, Justus F Kleine, Johannes Kaesmacher, Silke Wunderlich, Benjamin Friedrich, Sascha Prothmann, Claus Zimmer, Tobias Boeckh-Behrens
BACKGROUND: This study aimed to analyze the effects of technical outcome of mechanical thrombectomy (MTE) on the associations between collateral status, assessed with pretreatment computed tomography angiography (CTA), and neurological and functional outcome, as well as associations between collaterals and metabolic risk factors (arterial hypertension, diabetes, hyperlipidemia, overweight). METHODS: Prospectively collected data of 115 patients with CTA-proven isolated middle cerebral artery occlusion treated successfully with MTE (Thrombosis in Cerebral Infarction [TICI] scale 2b or 3) were assessed retrospectively...
November 14, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/27847772/endovascular-treatment-of-giant-serpentine-aneurysm-of-the-middle-cerebral-artery
#6
Young Ha Jeong, Jong Yeon Kim, Youn Moo Koo, Jong Wook Choi, Kum Whang, Chul Hu, Sung Min Cho
Giant serpentine aneurysms are uncommon types of aneurysmal disease and have angiographically authentic features. We report a case of a 44-year-old male with headache and seizure. He presented a giant serpentine aneurysm arising from the middle cerebral artery (MCA). It was a large intracranial aneurysm thrombosed as a mass-like lesion while it maintained its outflow drainage into the distal MCA branches. The balloon occlusion test (BOT) was performed to test the tolerance of temporary collateral circulation...
September 2016: Journal of Cerebrovascular and Endovascular Neurosurgery
https://www.readbyqxmd.com/read/27847759/analysis-of-the-outcome-and-prognostic-factors-of-decompressive-craniectomy-between-young-and-elderly-patients-for-acute-middle-cerebral-artery-infarction
#7
Byung Rhae Yoo, Chan Jong Yoo, Myeong Jin Kim, Woo-Kyung Kim, Dae Han Choi
OBJECTIVE: We compared the effect of decompressive craniectomy between patients < 65 and ≥ 65 years age and investigated prognostics factors that may help predict favorable outcome in acute stroke patients undergoing decompressive surgery. MATERIALS AND METHODS: 52 patients diagnosed with acute middle cerebral artery (MCA) territory infarction that underwent decompressive craniectomy were retrospectively reviewed. The outcome of all patients were evaluated by assessing the Glasgow coma scale, Glasgow outcome scale (GOS), and Modified Rankin scale (mRS) six months after the onset of the disease...
September 2016: Journal of Cerebrovascular and Endovascular Neurosurgery
https://www.readbyqxmd.com/read/27844273/sex-differences-in-the-cerebral-collateral-circulation
#8
James E Faber, Scott M Moore, Jennifer L Lucitti, Amir Aghajanian, Hua Zhang
Premenopausal women and intact female rodents sustain smaller cerebral infarctions than males. Several sex-dependent differences have been identified as potential contributors, but many questions remain unanswered. Mice exhibit wide variation in native collateral number and diameter (collateral extent) that is dependent on differences in genetic background, aging, and other comorbidities and that contributes to their also-wide differences in infarct volume. Likewise, variation in infarct volume correlates with differences in collateral-dependent blood flow in patients with acute ischemic stroke...
November 14, 2016: Translational Stroke Research
https://www.readbyqxmd.com/read/27836298/long-term-prognostic-value-of-qrs-score-in-patients-with-successfully-recanalized-coronary-chronic-total-occlusion-and-construction-of-a-predictive-nomogram-model
#9
Hao Xie, Li-Ming Chen, Hai-Hui Sun, Lin Li, Hang Liu, Wen-Jia Li, Jian-Bang Jiang, Lian-Qun Cui
BACKGROUND: Few studies have evaluated the prognostic value of QRS score in patients with coronary chronic total occlusion (CTO) after successful recanalization. METHODS: A total of 474 patients with successfully recanalized coronary CTO were finally included in our study and were followed up for 34.0±5.3months. They were divided into 3 groups: QRS score≥8, QRS score 4-7 and QRS score 0-3. The primary outcome was composite endpoint of major adverse cardiac and cerebral events (MACCEs)...
October 29, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27834752/cyclooxygenase-2-derived-prostaglandins-mediate-cerebral-microcirculation-in-a-juvenile-ischemic-rat-model
#10
Pierre-Louis Leger, Julien Pansiot, Valerie Besson, Bruno Palmier, Sylvain Renolleau, Olivier Baud, Bruno Cauli, Christiane Charriaut-Marlangue
BACKGROUND AND PURPOSE: We previously showed that the selective neuronal nitric oxide synthase inhibitor 7-nitroindazole (7-NI) increases cerebral microcirculation in a juvenile ischemic rat model. We address the roles of cyclooxygenase (COX)-elaborated prostaglandins in collateral recruitment and blood supply. METHODS: Fourteen-day-old rats were subjected to ischemia-reperfusion and treated with either PBS or 7-NI (25 mg/kg) at the reperfusion onset. Six-keto-prostaglandin F1α was measured using ELISA...
December 2016: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/27834741/impaired-collateral-flow-compensation-during-chronic-cerebral-hypoperfusion-in-the-type-2-diabetic-mice
#11
Yasuo Nishijima, Yosuke Akamatsu, Shih Yen Yang, Chih Cheng Lee, Utku Baran, Shaozhen Song, Ruikang K Wang, Teiji Tominaga, Jialing Liu
BACKGROUND AND PURPOSE: The presence of collaterals is associated with a reduced risk of stroke and transient ischemic attack in patients with steno-occlusive carotid artery disease. Although metabolic syndrome negatively impacts collateral status, it is unclear whether and to what extent type 2 diabetes mellitus affects cerebral collateral flow regulation during hypoperfusion. METHODS: We examined the spatial and temporal changes of the leptomeningeal collateral flow and the flow dynamics of the penetrating arterioles in the distal middle cerebral artery and anterior cerebral artery branches over 2 weeks after unilateral common carotid artery occlusion (CCAO) using optical coherent tomography in db/+ and db/db mice...
December 2016: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/27831856/the-dual-role-of-cerebral-autoregulation-and-collateral-flow-in-the-circle-of-willis-after-major-vessel-occlusion
#12
Flora Kennedy McConnell, Stephen Payne
OBJECTIVE: Ischaemic stroke is a leading cause of death and disability. Autoregulation and collateral blood flow through the circle of Willis both play a role in preventing tissue infarction. To investigate the interaction of these mechanisms a one-dimensional steady state model of the cerebral arterial network was created. METHODS: Structural variants of the circle of Willis that present particular risk of stroke were recreated using a network model coupled with: (1) a steady state physiological model of cerebral autoregulation; (2) one wherein the cerebral vascular bed was modelled as a passive resistance...
November 1, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27811134/impact-of-modified-tici-3-versus-modified-tici-2b-reperfusion-score-to-predict-good-outcome-following-endovascular-therapy
#13
C Dargazanli, A Consoli, M Barral, J Labreuche, H Redjem, G Ciccio, S Smajda, J P Desilles, G Taylor, C Preda, O Coskun, G Rodesch, M Piotin, R Blanc, B Lapergue
BACKGROUND AND PURPOSE: The TICI score is widely used to evaluate cerebral perfusion before and after the endovascular treatment of stroke. Recent studies showing the effectiveness and safety of mechanical thrombectomy combine modified TICI 2b and modified TICI 3 to assess the technical success of endovascular treatment. The purpose of this study was to determine how much clinical outcomes differ between patients achieving modified TICI 2b and modified TICI 3 reperfusion. MATERIALS AND METHODS: We analyzed 222 consecutive patients with acute large intracranial artery occlusion of the anterior circulation having achieved modified TICI 2b or modified TICI 3 reperfusion after thrombectomy...
November 3, 2016: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/27807197/venous-imaging-based-biomarkers-in-acute-ischaemic-stroke
#14
REVIEW
Josep Munuera, Gerard Blasco, María Hernández-Pérez, Pepus Daunis-I-Estadella, Antoni Dávalos, David S Liebeskind, Max Wintermark, Andrew Demchuk, Bijoy K Menon, Götz Thomalla, Kambiz Nael, Salvador Pedraza, Josep Puig
Vascular neuroimaging plays a decisive role in selecting the best therapy in patients with acute ischaemic stroke. However, compared with the arterial system, the role of veins has not been thoroughly studied. In this review, we present the major venous imaging-based biomarkers in ischaemic stroke. First, the presence of hypodense veins in the monophasic CT angiography ipsilateral to the arterial occlusion. Second, the asymmetry of venous drainage in the pathological cerebral hemisphere on CT and MRI dynamic angiography...
November 2, 2016: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/27801767/pontine-warning-syndrome-a-chameleon-of-ischemic-stroke
#15
Alejandro Enriquez-Marulanda, Pablo Amaya-Gonzalez, Jorge L Orozco
INTRODUCTION: Crescendo transient ischemic attacks or "Stroke Warning Syndromes" consist of stereotyped frequent short-lasting episodes of focal neurological deficits. This is explained by intermittent hypoperfusion of the vascular territory of terminal arteries with insufficient collateral flow, presenting a high risk for subsequent infarction. Pontine warning syndrome (PWS) is a subtype of this atypical presentation of stroke/transient ischemic attack and is considered a challenge for diagnosis...
November 2016: Neurologist
https://www.readbyqxmd.com/read/27798270/magnetic-resonance-imaging-of-local-and-remote-vascular-remodelling-after-experimental-stroke
#16
Pavel Yanev, Peter R Seevinck, Umesh S Rudrapatna, Mark Jrj Bouts, Annette van der Toorn, Karen Gertz, Golo Kronenberg, Matthias Endres, Geralda A van Tilborg, Rick M Dijkhuizen
The pattern of vascular remodelling in relation to recovery after stroke remains largely unclear. We used steady-state contrast-enhanced magnetic resonance imaging to assess the development of cerebral blood volume and microvascular density in perilesional and exofocal areas from (sub)acutely to chronically after transient stroke in rats. Microvascular density was verified histologically after infusion with Evans Blue dye. At day 1, microvascular cerebral blood volume and microvascular density were reduced in and around the ischemic lesion (intralesional borderzone: microvascular cerebral blood volume = 72 ± 8%; microvascular density = 76 ± 8%) (P < 0...
October 19, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27796449/endovascular-treatment-of-carotico-cavernous-fistulas-with-acrylic-glue-a-series-of-nine-cases
#17
Marcus Ohlsson, Arturo Consoli, Georges Rodesch
INTRODUCTION: Injuries to the internal carotid artery close to the cavernous sinus may result in a fistulous connection between the artery and the venous sinus. Symptoms include pulsatile tinnitus, intracranial bruit, ophthalmological symptoms, and risk of intracerebral hematoma in cases of cortical venous reflux. Previous treatment strategies have included detachable latex balloons, coils, covered stents, or combinations thereof. Today, detachable latex balloons are phased out or withdrawn from several markets...
October 29, 2016: Neuroradiology
https://www.readbyqxmd.com/read/27781051/improving-the-evaluation-of-collateral-circulation-by-multiphase-computed-tomography-angiography-in-acute-stroke-patients-treated-with-endovascular-reperfusion-therapies
#18
Alvaro García-Tornel, Vanessa Carvalho, Sandra Boned, Alan Flores, David Rodríguez-Luna, Jorge Pagola, Marian Muchada, Estela Sanjuan, Pilar Coscojuela, Jesus Juega, Noelia Rodriguez-Villatoro, Bijoy Menon, Mayank Goyal, Marc Ribó, Alejandro Tomasello, Carlos A Molina, Marta Rubiera
: Good collateral circulation (CC) is associated with favorable outcomes in acute stroke, but the best technique to evaluate collaterals is controversial. Single-phase computed tomography angiography (sCTA) is widely used but lacks temporal resolution. We aim to compare CC evaluation by sCTA and multiphase CTA (mCTA) as predictors of outcome in endovascular treated patients. METHODS: Consecutive endovascular treated patients with M1 middle cerebral artery (MCA) or terminal intracranial carotid artery (TICA) occlusion confirmed by sCTA were included...
September 2016: Interventional Neurology
https://www.readbyqxmd.com/read/27769189/the-collateral-circulation-determines-cortical-infarct-volume-in-anterior-circulation-ischemic-stroke
#19
Estelle Seyman, Hilla Shaim, Shani Shenhar-Tsarfaty, Tali Jonash-Kimchi, Natan M Bornstein, Hen Hallevi
BACKGROUND: Acute ischemic stroke (AIS) is a common neurological event that causes varying degrees of disability. AIS outcome varies considerably, from complete recovery to complete loss of tissue and function. This diversity is partly explained by the compensatory ability of the collateral circulation and the ensuing cerebral flow grade. The collateral flow to the anterior circulation largely supplies the cortical areas. The deep brain tissue is supplied by penetrating arteries and has little or no collateral supply...
October 21, 2016: BMC Neurology
https://www.readbyqxmd.com/read/27765736/collateral-assessment-by-ct-angiography-as-a-predictor-of-outcome-in-symptomatic-cervical-internal-carotid-artery-occlusion
#20
S Sundaram, S Kannoth, B Thomas, P S Sarma, P N Sylaja
BACKGROUND AND PURPOSE: Cervical internal carotid artery occlusion can present with varied clinical manifestations such as transient ischemic attack, stroke, and chronic ocular ischemia, or can be asymptomatic. The outcome in these patients is considerably influenced by cerebral hemodynamic compensatory adaptation of the intracranial collateral pathways. Our aim was to study whether collateral circulation as assessed by CT angiography can predict 3-month outcome and initial stroke severity in patients with symptomatic cervical ICA occlusion...
October 20, 2016: AJNR. American Journal of Neuroradiology
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