keyword
MENU ▼
Read by QxMD icon Read
search

Stroke Perfusion

keyword
https://www.readbyqxmd.com/read/29033829/exercise-training-increases-parietal-lobe-cerebral-blood-flow-in-chronic-stroke-an-observational-study
#1
Andrew D Robertson, Susan Marzolini, Laura E Middleton, Vincenzo S Basile, Paul I Oh, Bradley J MacIntosh
Exercise is increasingly recommended as an essential component of stroke rehabilitation, yet uncertainty remains with respect to its direct effect on the cerebral vasculature. The current study first demonstrated the repeatability of pseudo-continuous arterial spin labeling (ASL) magnetic resonance imaging (MRI) in older adults with stroke, and then investigated the change in cerebrovascular function following a 6-month cardiovascular rehabilitation program. In the repeatability study, 12 participants at least 3 months post-stroke underwent two ASL imaging scans 1 month apart...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29033392/mechanical-recanalization-in-ischemic-anterior-circulation-stroke-within-an-8-hour-time-window-a-real-world-experience
#2
Dagmar Krajíčková, Antonín Krajina, Roman Herzig, Miroslav Lojík, Vendelín Chovanec, Jan Raupach, Eva Vítková, Jan Waishaupt, Oldřich Vyšata, Martin Vališ
PURPOSE: We aimed to assess the safety and effectiveness of mechanical recanalization in patients with ischemic stroke in the anterior circulation within 8 h since symptoms onset and with unknown onset time. We compared time intervals <6 h vs. 6-8 h/unknown onset time, as only limited data are available for a time window beyond 6 h. METHODS: Our cohort included 110 consecutive patients (44 males; mean age, 73.0±11.5 years) with ischemic stroke in the anterior circulation due to the acute occlusion of a large intracranial artery who underwent mechanical recanalization within an 8-hour time window or with unknown onset time...
October 16, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/29032219/emergency-extracranial-intracranial-bypass-to-revascularize-salvageable-brain-tissue-in-acute-ischemic-stroke-patients
#3
Jan-Karl Burkhardt, Sebastian Winklhofer, Jorn Fierstra, Susanne Wegener, Giuseppe Esposito, Andreas Luft, Oliver Bozinov, Luca Regli
INTRODUCTION: To present an algorithm based on clinical and radiological factors including MR perfusion/diffusion mismatch (MR-PDM) for the indication of urgent cerebral bypass in patients with acute ischemic stroke METHODS: Analysis of clinical and radiological data on eight consecutive patients undergoing urgent cerebral revascularization for acute ischemic stroke due to occlusion of the internal carotid or middle cerebral artery between 2012 and 2015. All patients were either not eligible or failed first line treatment with emergent endovascular revascularization...
October 11, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29028286/doppler-guided-goal-directed-fluid-therapy-does-not-affect-intestinal-cell-damage-but-increases-global-gastrointestinal-perfusion-in-colorectal-surgery-a-randomized-controlled-trial
#4
Kostan W Reisinger, Henriette M Willigers, Jochen Jansen, Wim A Buurman, Maarten F Von Meyenfeldt, Geerard L Beets, Martijn Poeze
Individualized, goal-directed fluid therapy (GDFT) based on Doppler measurements of stroke volume has been proposed as a treatment strategy in terms of reducing complications, mortality and length of hospital stay in major bowel surgery. We studied the effect of Doppler guided GDFT on intestinal damage as compared with standard post-operative fluid replacement. STUDY DESIGN: Patients undergoing elective colorectal resection for malignancy were randomized to standard intra- and postoperative fluid therapy or standard fluid therapy with additional Doppler guided GDFT...
October 13, 2017: Colorectal Disease: the Official Journal of the Association of Coloproctology of Great Britain and Ireland
https://www.readbyqxmd.com/read/29026412/the-role-of-manual-thrombectomy-in-cardiovascular-outcome-among-patients-with-total-cutoff-vessel-myocardial-infarction-undergoing-primary-percutaneous-coronary-intervention
#5
Alireza Khosravi, Davoud Rajabi, Masoud Pourmoghaddas, Afzal Roohi, Masoumeh Esmaeili
BACKGROUND: The applicability of manual aspiration thrombectomy in patients with ST-segment elevation myocardial infarction (STEMI) has been a challenging issue. This study aimed to compare the impact of additive manual thrombectomy on patients with myocardial infarction (MI) and total cutoff vessel with standard primary percutaneous coronary intervention (PPCI) with bailout thrombectomy. METHODS: In this case-control study, 181 patients with acute STEMI were enrolled who referred to Chamran Hospital (Isfahan, Iran) between August to December 2014...
March 2017: ARYA Atherosclerosis
https://www.readbyqxmd.com/read/29023523/the-role-of-glutamate-in-neuronal-ion-homeostasis-a-case-study-of-spreading-depolarization
#6
Niklas Hübel, Mahshid S Hosseini-Zare, Jokūbas Žiburkus, Ghanim Ullah
Simultaneous changes in ion concentrations, glutamate, and cell volume together with exchange of matter between cell network and vasculature are ubiquitous in numerous brain pathologies. A complete understanding of pathological conditions as well as normal brain function, therefore, hinges on elucidating the molecular and cellular pathways involved in these mostly interdependent variations. In this paper, we develop the first computational framework that combines the Hodgkin-Huxley type spiking dynamics, dynamic ion concentrations and glutamate homeostasis, neuronal and astroglial volume changes, and ion exchange with vasculature into a comprehensive model to elucidate the role of glutamate uptake in the dynamics of spreading depolarization (SD)-the electrophysiological event underlying numerous pathologies including migraine, ischemic stroke, aneurysmal subarachnoid hemorrhage, intracerebral hematoma, and trauma...
October 12, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29016776/atrial-fibrillation-is-associated-with-decreased-total-cerebral-blood-flow-and-brain-perfusion
#7
Marianna Gardarsdottir, Sigurdur Sigurdsson, Thor Aspelund, Hrafnhildur Rokita, Lenore J Launer, Vilmundur Gudnason, David O Arnar
Aims: Atrial fibrillation (AF) has been associated with cognitive impairment. Additionally, brain volume may be reduced in individuals with AF. Potential causes may include cerebral micro-embolism or reduced stroke volume due to the beat-to-beat variation in AF. The aims of this study were to measure cerebral blood flow and estimate whole brain perfusion in elderly individuals with and without AF. Methods and results: Blood flow in the cervical arteries was measured with phase contrast MRI and brain perfusion estimated in a large cohort from the AGES-Reykjavik Study...
August 9, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28994833/the-efficacy-and-safety-of-endovascular-recanalization-of-occluded-large-cerebral-arteries-during-the-subacute-phase-of-cerebral-infarction-a-case-series-report
#8
Kangning Chen, Xianhua Hou, Zhenhua Zhou, Guangjian Li, Qu Liu, Li Gui, Jun Hu, Shugui Shi
BACKGROUND: Intravenous tissue plasminogen activator with or without mechanical thrombectomy during the acute phase are approved therapies for ischaemic stroke. Due to the short treatment time window (<6 hours) and often treatment failure, these patients would still have an intracranial arterial occlusion (IAO). It is unclear whether these patients can benefit from subsequent interventional recanalizationof their occluded artery in the subacute phase. In this retrospective study, we have examined the efficacy and safety in patients who have received either percutaneous transluminal angioplasty (PTA) or percutaneous transluminal angioplasty and stenting (PTAS) for IAO in the subacute phase of their stroke...
September 2017: Stroke and Vascular Neurology
https://www.readbyqxmd.com/read/28987196/overview-of-neuroradiology
#9
Elna-Marie Larsson, Johan Wikström
Neuroradiology with computed tomography (CT) and magnetic resonance imaging (MRI) is essential for the initial evaluation of patients with a clinical suspicion of brain and spine disorders. Morphologic imaging is required to obtain a probable diagnosis to support the treatment decisions in pre- and perinatal disorders, vascular diseases, traumatic injuries, metabolic disorders, epilepsy, infection/inflammation, neurodegenerative disorders, degenerative spinal disease, and tumors of the central nervous system...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/28984705/the-crashing-patient-hemodynamic-collapse
#10
Hitesh Gidwani, Hernando Gómez
PURPOSE OF REVIEW: Rapid restoration of tissue perfusion and oxygenation are the main goals in the resuscitation of a patient with circulatory collapse. This review will focus on providing an evidence based framework of the technological and conceptual advances in the evaluation and management of the patient with cardiovascular collapse. RECENT FINDINGS: The initial approach to the patient in cardiovascular collapse continues to be based on the Ventilate-Infuse-Pump rule...
October 4, 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/28984631/right-ventricular-perfusion-physiology-and-clinical-implications
#11
George J Crystal, Paul S Pagel
Regulation of blood flow to the right ventricle differs significantly from that to the left ventricle. The right ventricle develops a lower systolic pressure than the left ventricle, resulting in reduced extravascular compressive forces and myocardial oxygen demand. Right ventricular perfusion has eight major characteristics that distinguish it from left ventricular perfusion: (1) appreciable perfusion throughout the entire cardiac cycle; (2) reduced myocardial oxygen uptake, blood flow, and oxygen extraction; (3) an oxygen extraction reserve that can be recruited to at least partially offset a reduction in coronary blood flow; (4) less effective pressure-flow autoregulation; (5) the ability to downregulate its metabolic demand during coronary hypoperfusion and thereby maintain contractile function and energy stores; (6) a transmurally uniform reduction in myocardial perfusion in the presence of a hemodynamically significant epicardial coronary stenosis; (7) extensive collateral connections from the left coronary circulation; and (8) possible retrograde perfusion from the right ventricular cavity through the Thebesian veins...
October 4, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28982332/asymmetric-cerebrovascular-collateral-supply-affects-cognition-in-patients-with-unilateral-carotid-artery-stenosis
#12
Kuo-Lun Huang, Ting-Yu Chang, Chien-Hung Chang, Ho-Ling Liu, Yeu-Jhy Chang, Chi-Hung Liu, Ho-Fai Wong, Yi-Ming Wu, Tsong-Hai Lee, Meng-Yang Ho
BACKGROUND: The time to maximum of the residue function (TMax) has been employed to identify the penumbra in acute ischemic stroke. Cognitive impairment in patients with carotid artery stenosis (CAS) has been attributed to chronic cerebral hypoperfusion. The study aimed to examine whether cognitive impairment can be detected based on a preliminary TMax cutoff in patients with unilateral CAS. METHODS: Fifty unilateral CAS patients underwent dynamic susceptibility contrast MR perfusion...
October 5, 2017: Current Neurovascular Research
https://www.readbyqxmd.com/read/28977379/single-centre-experience-with-the-frozen-elephant-trunk-technique-in-251-patients-over-15%C3%A2-years
#13
Malakh Shrestha, Andreas Martens, Tim Kaufeld, Erik Beckmann, Sebastian Bertele, Heike Krueger, Julia Neuser, Felix Fleissner, Fabio Ius, Firas Abd Alhadi, Jasmin Hanke, Jan D Schmitto, Serghei Cebotari, Matthias Karck, Axel Haverich, Ajay Chavan
OBJECTIVES: Our goal was to present our 15-year experience (2001-2015) with the frozen elephant trunk (FET) technique. METHODS: A total of 251 patients (82 with aortic aneurysms, 96 with acute aortic dissection type A, 4 with acute type B dissections, 52 with chronic aortic dissection type A, 17 with chronic type B dissection and 67 redo cases) underwent FET implantation with either the custom-made Chavan-Haverich ( n  = 66), the Jotec E-vita ( n  = 31) or the Vascutek Thoraflex hybrid ( n  = 154) prosthesis...
August 1, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28976180/magnetic-particle-imaging-for-real-time-perfusion-imaging-in-acute-stroke
#14
Peter Ludewig, Nadine Gdaniec, Jan Sedlacik, Nils D Forkert, Patryk Szwargulski, Matthias Graeser, Gerhard Adam, Michael G Kaul, Kannan M Krishnan, R Matthew Ferguson, Amit P Khandhar, Piotr Walczak, Jens Fiehler, Götz Thomalla, Christian Gerloff, Tobias Knopp, Tim Magnus
The fast and accurate assessment of cerebral perfusion is fundamental for the diagnosis and successful treatment of stroke patients. Magnetic particle imaging (MPI) is a new radiation-free tomographic imaging method with a superior temporal resolution, compared to other conventional imaging methods. In addition, MPI scanners can be built as prehospital mobile devices, which require less complex infrastructure than computed tomography (CT) and magnetic resonance imaging (MRI). With these advantages, MPI could accelerate the stroke diagnosis and treatment, thereby improving outcomes...
October 4, 2017: ACS Nano
https://www.readbyqxmd.com/read/28974995/the-role-of-imaging-in-clinical-stroke-scales-that-predict-functional-outcome-a-systematic-review
#15
Fatima Soliman, Ajay Gupta, Diana Delgado, Hooman Kamel, Ankur Pandya
BACKGROUND AND PURPOSE: Numerous stroke scales have been developed to predict functional outcomes following acute ischemic stroke. The goal of this study was to summarize functional outcome scores in stroke that incorporate neuroimaging with those that don't incorporate neuroimaging. METHODS: Searches were conducted in Ovid MEDLINE, Ovid Embase, and the Cochrane Library Database from inception to January 23, 2015. Additional records were identified by employing the "Cited by" and "View References" features in Scopus...
October 2017: Neurohospitalist
https://www.readbyqxmd.com/read/28974994/detecting-myocardial-ischemia-with-99m-technetium-tetrofosmin-myocardial-perfusion-imaging-in-ischemic-stroke
#16
Sotirios Giannopoulos, Sofia Markoula, Chrissa Sioka, Sofia Zouroudi, Maria Spiliotopoulou, Katerina K Naka, Lampros K Michalis, Andreas Fotopoulos, Athanassios P Kyritsis
BACKGROUND: To assess the myocardial status in patients with stroke, employing myocardial perfusion imaging (MPI) with (99m)Technetium-tetrofosmin ((99m)Tc-TF)-single-photon emission computed tomography (SPECT). METHODS: Fifty-two patients with ischemic stroke were subjected to (99m)Tc-TF-SPECT MPI within 1 month after stroke occurrence. None of the patients had any history or symptoms of coronary artery disease or other heart disease. Myocardial perfusion imaging was evaluated visually using a 17-segment polar map...
October 2017: Neurohospitalist
https://www.readbyqxmd.com/read/28974571/endothelial-mineralocorticoid-receptor-mediates-parenchymal-arteriole-and-posterior-cerebral-artery-remodeling-during-angiotensin-ii-induced-hypertension
#17
Janice M Diaz-Otero, Courtney Fisher, Kelsey Downs, M Elizabeth Moss, Iris Z Jaffe, William F Jackson, Anne M Dorrance
The brain is highly susceptible to injury caused by hypertension because the increased blood pressure causes artery remodeling that can limit cerebral perfusion. Mineralocorticoid receptor (MR) antagonism prevents hypertensive cerebral artery remodeling, but the vascular cell types involved have not been defined. In the periphery, the endothelial MR mediates hypertension-induced vascular injury, but cerebral and peripheral arteries are anatomically distinct; thus, these findings cannot be extrapolated to the brain...
October 3, 2017: Hypertension
https://www.readbyqxmd.com/read/28974452/long-term-optical-imaging-of-neurovascular-coupling-in-mouse-cortex-using-gcamp6f-and-intrinsic-hemodynamic-signals
#18
Xiaochun Gu, Wei Chen, Jiang You, Alan P Koretsky, N D Volkow, Yingtian Pan, Congwu Du
Cerebral hemodynamics is modulated in response to changes in neuronal activity, a process termed neurovascular coupling (NVC), which can be disrupted by neuropsychiatric diseases (e.g., stroke, Alzheimer's disease). Thus, there is growing interest to image long-term NVC dynamics with high spatiotemporal resolutions. Here, by combining the use of a genetically-encoded calcium indicator with optical techniques, we develop a longitudinal multimodal optical imaging platform (MIP) that enabled time-lapse tracking of NVC over a relatively large field of view in the mouse somatosensory cortex at single cell and single vessel resolutions...
September 30, 2017: NeuroImage
https://www.readbyqxmd.com/read/28973000/temporal-similarity-perfusion-mapping-a-standardized-and-model-free-method-for-detecting-perfusion-deficits-in-stroke
#19
Sunbin Song, Reinoud P H Bokkers, Marie Luby, Matthew A Edwardson, Tyler Brown, Shreyansh Shah, Robert W Cox, Ziad S Saad, Richard C Reynolds, Daniel R Glen, Leonardo G Cohen, Lawrence L Latour
INTRODUCTION: Interpretation of the extent of perfusion deficits in stroke MRI is highly dependent on the method used for analyzing the perfusion-weighted signal intensity time-series after gadolinium injection. In this study, we introduce a new model-free standardized method of temporal similarity perfusion (TSP) mapping for perfusion deficit detection and test its ability and reliability in acute ischemia. MATERIALS AND METHODS: Forty patients with an ischemic stroke or transient ischemic attack were included...
2017: PloS One
https://www.readbyqxmd.com/read/28971700/clinical-imaging-and-electroencephalographic-characterization-of-three-cases-of-handl-syndrome
#20
Sonia Quintas, Rocío López Ruiz, Santiago Trillo, Ana Beatriz Gago-Veiga, Gustavo Zapata-Wainberg, Julio Dotor García-Soto, Álvaro Ximénez-Carrillo, Jose Vivancos
Introduction The syndrome of transient headache and neurological deficits with cerebrospinal fluid lymphocytosis (HaNDL) may mimic stroke when patients present with acute/subacute focal neurological deficits. It would be helpful to identify investigations that assist the neurologist in differentiating between HaNDL and stroke. Case reports We describe three cases that proved to be HaNDL, but were initially considered to be strokes. Hypoperfusion was noted in the CT perfusion (CTP) studies in all three cases, which extended beyond any single cerebral arterial supply...
January 1, 2017: Cephalalgia: An International Journal of Headache
keyword
keyword
40201
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"