keyword
MENU ▼
Read by QxMD icon Read
search

Cerebral collateral

keyword
https://www.readbyqxmd.com/read/28915102/acceleration-selective-arterial-spin-labeling-mr-angiography-used-to-visualize-distal-cerebral-arteries-and-collateral-vessels-in-moyamoya-disease
#1
Osamu Togao, Akio Hiwatashi, Makoto Obara, Koji Yamashita, Kazufumi Kikuchi, Ryotaro Kamei, Ataru Nishimura, Koichi Arimura, Koji Yoshimoto, Koji Iihara, Marc Van Cauteren, Hiroshi Honda
Purpose To evaluate and compare the performance of acceleration-selective arterial spin labeling (AccASL) magnetic resonance (MR) angiography in the visualization of cerebral arteries and collateral vessels in patients with Moyamoya disease with that of time-of-flight (TOF) MR angiography, with digital subtraction angiography (DSA) as the reference standard. Materials and Methods Thirty-six cerebral hemispheres from 22 patients with Moyamoya disease underwent TOF and AccASL MR angiography and DSA. Qualitative evaluations included imaging of the terminal internal carotid artery (ICA), distal middle cerebral arteries (MCAs), Moyamoya vessels, and leptomeningeal anastomosis (LMA) collaterals with reference to DSA...
September 15, 2017: Radiology
https://www.readbyqxmd.com/read/28913838/simultaneous-acquisition-of-perfusion-image-and-dynamic-mr-angiography-using-time-encoded-pseudo-continuous-asl
#2
Yuriko Suzuki, Michael Helle, Peter Koken, Marc Van Cauteren, Matthias J P van Osch
PURPOSE: Both dynamic magnetic resonance angiography (4D-MRA) and perfusion imaging can be acquired by using arterial spin labeling (ASL). While 4D-MRA highlights large vessel pathology, such as stenosis or collateral blood flow patterns, perfusion imaging provides information on the microvascular status. Therefore, a complete picture of the cerebral hemodynamic condition could be obtained by combining the two techniques. Here, we propose a novel technique for simultaneous acquisition of 4D-MRA and perfusion imaging using time-encoded pseudo-continuous arterial spin labeling...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28905995/leptomeningeal-collateral-status-predicts-outcome-after-middle-cerebral-artery-occlusion
#3
C F Madelung, C Ovesen, C Trampedach, A Christensen, I Havsteen, C K Hansen, H Christensen
OBJECTIVES: Perfusion through leptomeningeal collateral vessels is a likely pivotal factor in the outcome of stroke patients. We aimed to investigate the effect of collateral status on outcome in a cohort of unselected, consecutive stroke patients with middle cerebral artery occlusion undergoing reperfusion therapy. MATERIALS AND METHODS: This retrospectively planned analysis was passed on prospectively collected data from 187 consecutive patients with middle cerebral artery occlusion admitted within 4...
September 14, 2017: Acta Neurologica Scandinavica
https://www.readbyqxmd.com/read/28902897/testing-the-effects-of-sensory-stimulation-as-a-collateral-based-therapeutic-for-ischemic-stroke-in-c57bl-6j-and-cd1-mouse-strains
#4
Aneeka M Hancock, Ron D Frostig
Utilizing a rat model of ischemic stroke, we have previously shown that sensory stimulation can completely protect rats from impending ischemic damage of cortex if this treatment is delivered within the first two hours post-permanent middle cerebral artery occlusion (pMCAo). The current study sought to extend our findings in rats to mice, which would allow new avenues of research not available in rats. Thus, young adult C57BL/6J and CD1 mice were tested for protection from ischemic stroke with the same protective sensory stimulation-based treatment...
2017: PloS One
https://www.readbyqxmd.com/read/28899897/transfusion-of-polynitroxylated-pegylated-hemoglobin-stabilizes-pial-arterial-dilation-and-decreases-infarct-volume-after-transient-middle-cerebral-artery-occlusion
#5
Suyi Cao, Jian Zhang, Li Ma, Carleton J C Hsia, Raymond C Koehler
BACKGROUND: Polynitroxylation of hemoglobin confers superoxide dismutase-mimetic and peroxidase activity and may protect from reperfusion injury in addition to facilitating oxygen transport. We determined whether transfusion of polynitroxylated PEGylated hemoglobin (PNPH) is protective in the rat filament model of 2 hours of middle cerebral artery occlusion (MCAO). METHODS AND RESULTS: Transfusion of 10 mL/kg of PNPH at 20 minutes of MCAO reduced infarct volume by over 70% (n=10)...
September 12, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28893698/clinical-manifestations-of-isolated-chronic-middle-cerebral-artery-occlusion-in-relation-to-angiographic-features
#6
Hee Sup Shin, Chang-Woo Ryu, Hak Cheol Ko, Soonchan Park, Sang-Beom Kim
BACKGROUND AND PURPOSE: Isolated chronic middle cerebral artery occlusion (ChMCAO) is not a rare condition, and it is known to cause hemodynamic stroke. The purpose of this study was to evaluate differences in the clinical manifestations and prognosis of isolated ChMCAO in relation to angiographic features. METHODS: Fifty-six patients with isolated ChMCAO were enrolled in this retrospectively study. In accordance with the degree of antegrade collateral flow (AF) on angiography, patients were categorized into poor and good AF groups...
September 8, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28893009/intracranial-aneurysms-involving-circle-of-willis-in-a-child-with-human-immunodeficiency-virus-associated-vasculitis-a-rare-case-report
#7
Amol Madanlal Lahoti, Abhijit Kishor Taori, Avinash Parashuram Dhok, Jitesh Subhash Rawat, Nihar Umakant Chandak
Intracranial Arterial Aneurysms (IAAs) are relatively rare in paediatric population and they account for at least 10%-15% of haemorrhagic strokes which occur during the first two decades of life. Here we present a unique and unusual case of Human Immunodeficiency Virus (HIV) infected child who presented with intracranial aneurysms with formation of collaterals and vasculopathy, demonstrating low viral count despite receiving adequate antiretroviral treatment. Intracranial vascular involvement, their complications and its incidence in these patients may become increasingly common as the management of human immunodeficiency virus infection continues to improve and afflicted patients survive for longer periods because of advancement in the antiretroviral treatment...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28867358/radiation-induced-large-vessel-cerebral-vasculopathy-in-pediatric-patients-with-brain-tumors-treated-with-proton-radiation-therapy
#8
Stephen F Kralik, Gordon A Watson, Chie-Schin Shih, Chang Y Ho, Whitney Finke, Jeffrey Buchsbaum
PURPOSE: The purpose of this research was to evaluate the incidence, time to development, imaging patterns, risk factors, and clinical significance of large vessel cerebral vasculopathy in pediatric patients with brain tumors treated with proton radiation therapy. METHODS AND MATERIALS: A retrospective study was performed on 75 consecutive pediatric patients with primary brain tumors treated with proton radiation therapy. Radiation-induced large vessel cerebral vasculopathy (RLVCV) was defined as intracranial large vessel arterial stenosis or occlusion confirmed on magnetic resonance angiography, computed tomographic angiography, catheter angiography, or a combination of these within an anatomic region with previous exposure to proton beam therapy and not present before radiation therapy...
July 12, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28862107/collateral-scoring-on-ct-angiogram-must-evaluate-phase-and-regional-pattern
#9
Colin Casault, Abdulaziz S Al Sultan, Anurag Trivedi, Sung Il Sohn, Emmad Qazi, Matthew Bokyo, Mohammed Almekhlafi, Christopher d'Esterre, Mayank Goyal, Andrew M Demchuk, Bijoy K Menon
PURPOSE: We measured anterior cerebral artery (ACA)-middle cerebral artery (MCA) and posterior cerebral artery (PCA)-MCA pial filling on single-phase computed tomography angiograms (sCTAs) in acute ischemic stroke and correlate with the CTA-based Massachusetts General Hospital (MGH) and digital subtraction angiography (DSA)-based American Society of Interventional and Therapeutic Neuroradiology (ASITN) score. METHODS: Patients with acute stroke and M1 MCA±intracranial internal carotid artery occlusion on baseline CTA were included...
September 2017: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
https://www.readbyqxmd.com/read/28855390/tissue-selective-salvage-of-the-white-matter-by-successful-endovascular-stroke-therapy
#10
Justus F Kleine, Mirjam Kaesmacher, Benedikt Wiestler, Johannes Kaesmacher
BACKGROUND AND PURPOSE: White matter (WM) is less vulnerable to ischemia than gray matter. In ischemic stroke caused by acute large-vessel occlusion, successful recanalization might therefore sometimes selectively salvage the WM, leading to infarct patterns confined to gray matter. This study examines occurrence, determinants, and clinical significance of such effects. METHODS: Three hundred twenty-two patients with acute middle cerebral artery occlusion subjected to mechanical thrombectomy were included...
August 30, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28855347/prolonged-cerebral-circulation-time-is-more-associated-with-symptomatic-carotid-stenosis-than-stenosis-degree-or-collateral-circulation
#11
Yong-Sin Hu, Wan-Yuo Guo, I-Hui Lee, Feng-Chi Chang, Chung-Jung Lin, Chun-Jen Lin, Chao-Bao Luo, Chih-Chun Wu, Han-Jui Lee
BACKGROUND AND PURPOSE: Current practice of revascularization for carotid stenosis (CS) primarily relies on symptoms and degree of stenosis. Other parameters, such as collateral circulation and cerebral circulation time (CCT), might influence the stroke risk in CS. This study was conducted to (1) investigate whether CCT is more associated with symptomatic CS than degree of stenosis and (2) elucidate the associations among the degree of stenosis, collateral status, and CCT. METHODS: From 2010 to 2016, 82 patients with unilateral CS were enrolled for DSA and divided into symptomatic and asymptomatic groups based on clinical presentation...
August 30, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28855346/impact-of-time-to-endovascular-reperfusion-on-outcome-differs-according-to-the-involvement-of-the-proximal-mca-territory
#12
Dennis M Hedderich, Tobias Boeckh-Behrens, Benjamin Friedrich, Benedikt Wiestler, Silke Wunderlich, Claus Zimmer, Urs Fischer, Justus F Kleine, Johannes Kaesmacher
BACKGROUND: The time interval between symptom onset and reperfusion is a major determinant of the benefit of endovascular therapy (ET) and patients' outcome. The impact of time may be attenuated in patients with robust collaterals. However, not all regions in the middle cerebral artery (MCA) territory have access to collaterals. PURPOSE: To evaluate if the involvement of the poorly collateralized proximal MCA territory has an impact on the degree of time dependency of patients' outcome...
August 30, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28835576/serial-arterial-spin-labeling-may-be-useful-in-assessing-the-therapeutic-course-of-cerebral-venous-thrombosis-case-reports
#13
Sho Furuya, Masahito Kawabori, Noriyuki Fujima, Kikutaro Tokairin, Shuho Goto, Motoyuki Iwasaki, Yoshimasa Niiya, Shoji Mabuchi
We report two cases of cerebral venous thrombosis (CVT) which serial arterial spin labeling (ASL) was useful in evaluating the clinical course of the disease. A 48-year-old female presented with acute seizure, and was diagnosed as transverse-sigmoid sinus thrombosis. ASL imaging revealed low signal intensity in the right temporal lobe, suggesting the decreased perfusion by elevated venous pressure. Soon after the treatment, while the development of venous collateral has not fully observed by magnetic resonance (MR) angiography, low ASL signal within the right temporal lobe have shown remarkable improvement...
August 23, 2017: Neurologia Medico-chirurgica
https://www.readbyqxmd.com/read/28829216/leukoaraiosis-as-an-outcome-predictor-in-the-acute-and-subacute-phases-of-stroke
#14
Fabio Fierini, Anna Poggesi, Leonardo Pantoni
Leukoaraiosis (LA) is one of the neuroimaging features of cerebral small vessel disease and is associated with poor long-term prognosis. Areas covered: This narrative review focuses on the predictive role of LA on the evolution of the ischemic brain damage and on the clinical outcome in the subacute phase of stroke and in the short-term period afterwards. Expert commentary: LA predicts poorer tissue outcome and clinical prognosis also in acute and subacute stroke. In acute stroke, LA is associated with a less favorable fate of brain infarct and is a marker of increased risk of thrombolysis-related hemorrhagic transformation...
September 4, 2017: Expert Review of Neurotherapeutics
https://www.readbyqxmd.com/read/28829010/combined-stump-pressure-and-oximetry-for-shunt-use-during-carotid-endarterectomy
#15
J Max Findlay, Rohit Kesarwani, Michael Jacka, B Elaine Marchak
BACKGROUND: Cross-clamp ischemia during carotid endarterectomy can be prevented with carotid bypass shunts in vulnerable patients identified by cerebral monitoring for ischemia. We compared transcranial cerebral oximetry (TCO) with carotid stump pressure measurements for selective shunt use. METHODS: We prospectively collected data on 300 consecutive patients operated on under general anesthesia between 2009 and 2016. Shunts were inserted for a 10% or greater drop in cerebral saturations and/or a mean stump pressure less than 40 mmHg...
August 22, 2017: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
https://www.readbyqxmd.com/read/28828135/computed-tomography-angiography-of-unilateral-agenesis-of-the-internal-carotid-artery-2-cases-report-with-focus-on-embryology-collateral-pathways-and-imaging
#16
Antonio Pierro, Savino Cilla, Eleonora Cucci, Giuseppina Sallustio
Congenital absence of internal carotid artery (ICA) is a rare anomaly seen in around 0.01% of the population. High incidence of aneurysms is reported in these patients population. Many patients are asymptomatic as the development of a collateral circulation ensures cerebral perfusion. The embryology, the common collateral pathways, and the imaging findings associated with this anomaly are illustrated with 2 new cases. We reported the cases of 2 totally asymptomatic patients at the time of imaging in which ICA agenesis was proved on computed tomography angiography...
September 2017: Radiology case reports
https://www.readbyqxmd.com/read/28820296/long-term-hemodynamic-changes-and-blood-pressure-in-atherosclerotic-major-cerebral-artery-disease
#17
Hiroshi Yamauchi, Shinya Kagawa, Masaaki Takahashi, Tatsuya Higashi
In patients with major cerebral artery disease, lower blood pressure might reduce blood flow in the collateral pathways, thereby impairing the growth of cerebral collaterals, inhibiting hemodynamic improvement. We evaluated the hemodynamic status twice using positron emission tomography and (15)O-gas, over time, in 89 medically treated patients with atherosclerotic internal carotid artery or middle cerebral artery disease that had no ischemic episodes during follow-up (mean, 28 ± 23 months). Changes in the mean hemispheric values of hemodynamic parameters in the territory of the diseased artery at follow-up were correlated with the mean blood pressure values at the baseline and follow-up examinations...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28801174/the-cerebral-collateral-circulation-relevance-to-pathophysiology-and-treatment-of-stroke
#18
REVIEW
Myron D Ginsberg
The brain's collateral circulation consists of arterial anastomotic channels capable of providing nutrient perfusion to brain regions whose normal sources of flow have become compromised, as occurs in acute ischemic stroke. Modern CT-based neuroimaging is capable of providing detailed information as to collateral extent and sufficiency and is complemented by magnetic resonance-based methods. In the present era of standard-of-care IV thrombolysis for acute ischemic stroke, and following the recent therapeutic successes of randomized clinical trials of acute endovascular intervention, the sufficiency of the collateral circulation has been convincingly established as a key factor influencing the likelihood of successful reperfusion and favorable clinical outcome...
August 8, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28790001/increased-ratio-of-superficial-temporal-artery-flow-rate-after-superficial-temporal-artery-to-middle-cerebral-artery-anastomosis-can-it-reflect-the-extent-of-collateral-flow
#19
Sung-Won Jin, Sung-Kon Ha, Hae-Bin Lee, Sang-Dae Kim, Se-Hoon Kim, Dong-Jun Lim
OBJECTIVE: There are several ways to identify donor artery patency and success of surgery after an anastomosis of the superficial temporal artery (STA) to the middle cerebral artery (MCA). The purpose of this study was to evaluate the ratio of bilateral STA mean flow rate (MFR) using color Doppler ultrasonography (CDUS) after bypass surgery and to confirm the possibility of this value as a predictor of the extent of collateral flow. METHODS: Eleven consecutive patients who had undergone STA-MCA anastomosis were included...
August 5, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28780251/convexity-subarachnoid-hemorrhage-due-to-cardioembolic-stroke-in-a-woman-with-thyrotoxicosis-%C3%AE-case-report
#20
Ioanna Spanou, Sophia Vassilopoulou, Eleni Koroboki, Argyro Tountopoulou, Georgios Velonakis, Dimos Dimitrios Mitsikostas
BACKGROUND: Non-traumatic convexity subarachnoid hemorrhage (cSAH) is a rarely reported condition with a wide spectrum of etiologies. Cerebral ischemia secondary to extracranial or intracranial atherosclerotic disease has been identified as a relatively uncommon cause of cSAH. CASE REPORT: We report a case of cSAH caused by cardioembolic stroke. A 69-year old female patient developed suddenly left-sided face and body weakness and numbness and visual neglect on the left...
August 2, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
keyword
keyword
27028
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"