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https://www.readbyqxmd.com/read/28077713/reversible-disruption-of-neuronal-mitochondria-by-ischemic-and-traumatic-injury-revealed-by-quantitative-two-photon-imaging-in-the-neocortex-of-anesthetized-mice
#1
Mikhail Kislin, Jeremy Sword, Ioulia V Fomitcheva, Deborah Croom, Evgeny Pryazhnikov, Eero Lihavainen, Dmytro Toptunov, Heikki Rauvala, Andre S Ribeiro, Leonard Khiroug, Sergei A Kirov
: Mitochondria play a variety of functional roles in cortical neurons, from metabolic support and neuroprotection to the release of cytokines that trigger apoptosis. In dendrites, mitochondrial structure is closely linked to their function, and fragmentation (fission) of the normally elongated mitochondria indicates loss of their function under pathological conditions, such as stroke and brain trauma. Using in vivo two-photon microscopy in mouse brain, we quantified mitochondrial fragmentation in a full spectrum of cortical injuries, ranging from severe to mild...
January 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28074981/-thrombolysis-in-stroke-mimics-experience-in-10-cases
#2
Alejandro M Brunser, Arnold Hoppe, Paula Muñoz, Pablo M Lavados, Sergio Illanes, Violeta Díaz, Verónica V Olavarría
BACKGROUND: The effectiveness of intravenous thrombolysis (IVT) in cerebral ischemia is time dependent. Stroke mimics (SM) are frequent in emergency rooms. The effort to reduce door to needle time, can lead to administer thrombolytics to SM. AIM: To describe the frequency and prognosis of SM treated with IVT. MATERIAL AND METHODS: Prospective analysis of all patients evaluated in a Chilean private clinic between December 2004 and July 2015 with a suspected acute ischemic stroke (AIS)...
October 2016: Revista Médica de Chile
https://www.readbyqxmd.com/read/28070749/an-automated-microemboli-detection-and-classification-system-using-backscatter-rf-signals-and-differential-evolution
#3
Karim Ferroudji, Nabil Benoudjit, Ayache Bouakaz
Embolic phenomena, whether air or particulate emboli, can induce immediate damages like heart attack or ischemic stroke. Embolus composition (gaseous or particulate matter) is vital in predicting clinically significant complications. Embolus detection using Doppler methods have shown their limits to differentiate solid and gaseous embolus. Radio-frequency (RF) ultrasound signals backscattered by the emboli contain additional information on the embolus in comparison to the traditionally used Doppler signals...
January 9, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28068417/preserved-collateral-blood-flow-in-the-endovascular-m2cao-model-allows-for-clinically-relevant-profiling-of-injury-progression-in-acute-ischemic-stroke
#4
Philip Little, Ola Kvist, Rikard Grankvist, Stefan Jonsson, Peter Damberg, Michael Söderman, Fabian Arnberg, Staffan Holmin
Interventional treatment regimens have increased the demand for accurate understanding of the progression of injury in acute ischemic stroke. However, conventional animal models severely inhibit collateral blood flow and mimic the malignant infarction profile not suitable for treatment. The aim of this study was to provide a clinically relevant profile of the emergence and course of ischemic injury in cases suitable for acute intervention, and was achieved by employing a M2 occlusion model (M2CAO) that more accurately simulates middle cerebral artery (MCA) occlusion in humans...
2017: PloS One
https://www.readbyqxmd.com/read/28064357/ischemic-stroke-experimental-models-and-reality
#5
REVIEW
Clemens J Sommer
The vast majority of cerebral stroke cases are caused by transient or permanent occlusion of a cerebral blood vessel ("ischemic stroke") eventually leading to brain infarction. The final infarct size and the neurological outcome depend on a multitude of factors such as the duration and severity of ischemia, the existence of collateral systems and an adequate systemic blood pressure, etiology and localization of the infarct, but also on age, sex, comorbidities with the respective multimedication and genetic background...
January 7, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28056995/aldehyde-dehydrogenase-2-activation-and-coevolution-of-its-%C3%AE%C2%B5pkc-mediated-phosphorylation-sites
#6
Aishwarya Nene, Che-Hong Chen, Marie-Hélène Disatnik, Leslie Cruz, Daria Mochly-Rosen
BACKGROUND: Mitochondrial aldehyde dehydrogenase 2 (ALDH2) is a key enzyme for the metabolism of many toxic aldehydes such as acetaldehyde, derived from alcohol drinking, and 4HNE, an oxidative stress-derived lipid peroxidation aldehyde. Post-translational enhancement of ALDH2 activity can be achieved by serine/threonine phosphorylation by epsilon protein kinase C (εPKC). Elevated ALDH2 is beneficial in reducing injury following myocardial infarction, stroke and other oxidative stress and aldehyde toxicity-related diseases...
January 5, 2017: Journal of Biomedical Science
https://www.readbyqxmd.com/read/28041702/can-we-predict-new-af-occurrence-in-single-chamber-icd-patients-insights-from-an-observational-investigation
#7
Mauro Biffi, Matteo Ziacchi, Renato Pietro Ricci, Domenico Facchin, Giovanni Morani, Maurizio Landolina, Maurizio Lunati, Saverio Iacopino, Alessandro Capucci, Stefano Bianchi, Tommaso Infusino, Giovanni Luca Botto, Luigi Padeletti, Giuseppe Boriani
BACKGROUND: Atrial tachyarrhythmias (AT/AF) have been associated with an increased risk of mortality, morbidity and ischemic stroke. Up to now, single chamber ICD diagnostics was not able to detect AT/AF, therefore the incidence of new onset AT/AF in patients with single chamber ICD is not known. OBJECTIVE: To evaluate incidence and predictors of AT/AF occurrence in patients with dual-chamber ICD with no pacing indications and no history of AT/AF that strictly mimic single chamber ICD recipient...
December 22, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/28031221/molecular-magnetic-resonance-imaging-discloses-endothelial-activation-after-transient-ischaemic-attack
#8
Aurélien Quenault, Sara Martinez de Lizarrondo, Olivier Etard, Maxime Gauberti, Cyrille Orset, Benoît Haelewyn, Helen C Segal, Peter M Rothwell, Denis Vivien, Emmanuel Touzé, Carine Ali
SEE SUN ET AL DOI101093/AWW306 FOR A SCIENTIFIC COMMENTARY ON THIS ARTICLE: About 20% of patients with ischaemic stroke have a preceding transient ischaemic attack, which is clinically defined as focal neurological symptoms of ischaemic origin resolving spontaneously. Failure to diagnose transient ischaemic attack is a wasted opportunity to prevent recurrent disabling stroke. Unfortunately, diagnosis can be difficult, due to numerous mimics, and to the absence of a specific test. New diagnostic tools are thus needed, in particular for radiologically silent cases, which correspond to the recommended tissue-based definition of transient ischaemic attack...
January 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28025572/influence-of-mir-155-on-cell-apoptosis-in-rats-with-ischemic-stroke-role-of-the-ras-homolog-enriched-in-brain-rheb-mtor-pathway
#9
Guoping Xing, Zengxiang Luo, Chi Zhong, Xudong Pan, Xiaowei Xu
BACKGROUND We designed and carried out this study to examine the role of miR-155 and the Rheb/mTOR pathway in ischemic stroke. We also investigated how these two elements interact with each other and contribute to injuries resulting from ischemic stroke. MATERIAL AND METHODS We used both a middle cerebral artery occlusion rat model in vivo and an oxygen-glucose deprivation cell model in vitro to simulate the onset of ischemic stroke. miR-155 mimics, miR-155 inhibitors, and Rheb siRNA were transfected to alter the expression of miR-155 and Rheb...
December 27, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28012846/neuroprotection-of-agomelatine-against-cerebral-ischemia-reperfusion-injury-through-an-antiapoptotic-pathway-in-rat
#10
Wijitra Chumboatong, Sarinthorn Thummayot, Piyarat Govitrapong, Chainarong Tocharus, Jinatta Jittiwat, Jiraporn Tocharus
Agomelatine is an agonist of the melatonergic MT1/MT2 receptors and an antagonist of the serotonergic 5-HT receptors. Its actions mimic melatonin in antioxidative and anti-inflammation. However, the protective mechanism of agomelatine in ischemic/reperfusion (I/R) injury has not been investigated. In this study, cerebral I/R injury rats were induced by middle cerebral artery occlusion (MCAO) for 2 h followed by reperfusion. The rats were randomly divided into 6 groups (12 rats per group): sham-operated; vehicle-treated I/R; 20 mg/kg, 40 mg/kg, and 80 mg/kg agomelatine-treated I/R; and 10 mg/kg melatonin-treated I/R...
January 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28007363/an-emergency-medicine-focused-review-of-seizure-mimics
#11
James Webb, Brit Long, Alex Koyfman
BACKGROUND: Seizures result in a change in motor, sensory, and behavioral symptoms caused by abnormal neurologic electrical activity. The symptoms share similar presentations of several other conditions, leading to difficulties in diagnosis and frequent improper management. OBJECTIVE: This review evaluates adult patients with suspected seizure, signs and symptoms of seizure, mimics of seizure, and an approach to management of seizure mimics. DISCUSSION: A seizure is caused by abnormal neurologic electrical activity resulting in altered motor, sensory, and behavioral symptoms...
December 19, 2016: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28004991/bilateral-versus-ipsilesional-cortico-subcortical-activity-patterns-in-stroke-show-hemispheric-dependence
#12
A Cristina Vidal, Paula Banca, Augusto G Pascoal, Gustavo C Santo, João Sargento-Freitas, Ana Gouveia, Miguel Castelo-Branco
Background Understanding of interhemispheric interactions in stroke patients during motor control is an important clinical neuroscience quest that may provide important clues for neurorehabilitation. In stroke patients, bilateral overactivation in both hemispheres has been interpreted as a poor prognostic indicator of functional recovery. In contrast, ipsilesional patterns have been linked with better motor outcomes. Aim We investigated the pathophysiology of hemispheric interactions during limb movement without and with contralateral restraint, to mimic the effects of constraint-induced movement therapy...
January 2017: International Journal of Stroke: Official Journal of the International Stroke Society
https://www.readbyqxmd.com/read/28003768/symptom-profiles-of-subsyndromal-depression-in-disease-clusters-of-diabetes-excess-weight-and-progressive-cerebrovascular-conditions-a-promising-new-type-of-finding-from-a-reliable-innovation-to-estimate-exhaustively-specified-multiple-indicators-multiple-causes
#13
Richard B Francoeur
Addressing subsyndromal depression in cerebrovascular conditions, diabetes, and obesity reduces morbidity and risk of major depression. However, depression may be masked because self-reported symptoms may not reveal dysphoric (sad) mood. In this study, the first wave (2,812 elders) from the New Haven Epidemiological Study of the Elderly (EPESE) was used. These population-weighted data combined a stratified, systematic, clustered random sample from independent residences and a census of senior housing. Physical conditions included progressive cerebrovascular disease (CVD; hypertension, silent CVD, stroke, and vascular cognitive impairment [VCI]) and co-occurring excess weight and/or diabetes...
2016: Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy
https://www.readbyqxmd.com/read/28003752/treadmill-exercise-promotes-neuroprotection-against-cerebral-ischemia-reperfusion-injury-via-downregulation-of-pro-inflammatory-mediators
#14
Ying Zhang, Richard Y Cao, Xinling Jia, Qing Li, Lei Qiao, Guofeng Yan, Jian Yang
BACKGROUND: Stroke is one of the major causes of morbidity and mortality worldwide, which is associated with serious physical deficits that affect daily living and quality of life and produces immense public health and economic burdens. Both clinical and experimental data suggest that early physical training after ischemic brain injury may reduce the extent of motor dysfunction. However, the exact mechanisms have not been fully elucidated. The aim of this study was to investigate the effects of aerobic exercise on neuroprotection and understand the underlying mechanisms...
2016: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28003156/direct-comparison-of-microglial-dynamics-and-inflammatory-profile-in-photothrombotic-and-arterial-occlusion-evoked-stroke
#15
Maria L Cotrina, Nanghong Lou, Jessica Tome-Garcia, James Goldman, Maiken Nedergaard
Many focal cerebral ischemia models utilize the middle cerebral artery occlusion (MCAO) evoked by coagulation to induce ischemic damage in the cortex and mimic the pathology observed in human patients. A second, increasingly popular model, the photothrombotic stroke, uses a laser beam to irradiate the MCA after administration of a photosensitizing dye. This widely used procedure is slowly replacing the MCAO model because of the easiness of the surgical protocol and the reproducibility of the damage. However, the photochemical reaction also results in wider microvascular injury...
December 18, 2016: Neuroscience
https://www.readbyqxmd.com/read/27998323/short-and-long-term-reduction-of-door-to-needle-time-in-thrombolysis-for-acute-stroke
#16
Bing Yu Chen, Aimen Moussaddy, Mark R Keezer, Yan Deschaintre, Alexandre Y Poppe
BACKGROUND: More timely administration of tissue plasminogen activator (alteplase) for patients with acute ischemic stroke yields greater clinical benefits. We implemented door-to-needle (DTN) time reduction strategies at our center and evaluated their short- and long-term effects on in-hospital treatment delays and clinical outcomes. METHODS: Strategies, including stroke team prenotification, direct computed tomography transfer, not routinely waiting for laboratory results and alteplase delivery on the computed tomography table, were implemented in June 2013...
December 21, 2016: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
https://www.readbyqxmd.com/read/27994357/clinical-correlates-of-leukoaraiosis-a-study-of-175-patients
#17
Rustom S Wadia, Sandesh K Ghiya, Joshita Singh, Santosh M Sontakke, Vishwas Bharadwaj, Rahul V Sonawane, Yogesh P Bade, K Shrikanth, Nikhil Goli, Rohit Singh Chauhan, Nilesh A Nadkarni
BACKGROUND: In India, the correlates of leukoaraiosis (LA) have not been widely reported. This study was designed to investigate the factors which correlate with LA. MATERIALS AND METHODS: We included patients with LA who consented for the study and graded their severity on the basis of Fazekas scale. We excluded patients with LA who did not consent/cooperate for the study as also patients with other white matter changes which mimic LA. RESULTS: LA is a common and under-rated cause of disability...
October 2016: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/27992822/thrombolytic-treatment-to-stroke-mimic-patients-via-telestroke
#18
Ganesh Asaithambi, Amy L Castle, Michael A Sperl, Jayashree Ravichandran, Aditi Gupta, Bridget M Ho, Sandra K Hanson
OBJECTIVE: The safety and outcomes of intravenous thrombolysis (IVT) to stroke patients via telestroke (TS) is similar to those presenting to stroke centers. Little is known on the accuracy of TS diagnosis among those receiving IVT. We sought to compare the rate of patients receiving IVT with diagnosis of ischemic stroke as opposed to stroke mimic (SM) in our TS network to those who presented to our comprehensive stroke center (CSC). MATERIALS AND METHODS: Consecutive patients receiving IVT between August 2014 and June 2015 were identified at our CSC and TS network...
December 14, 2016: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/27987329/fetal-alcohol-exposure-alters-blood-flow-and-neurological-responses-to-transient-cerebral-ischemia-in-adult-mice
#19
Shameena Bake, Rachel Gardner, Joseph D Tingling, Rajesh C Miranda, Farida Sohrabji
BACKGROUND: Prenatal alcohol exposure (PAE) can result in physical and neurocognitive deficits that are collectively termed "fetal alcohol spectrum disorders" (FASD). Although FASD is associated with lifelong intellectual disability, the mechanisms mediating the emergence of secondary mental health and physical disabilities are poorly understood. Based on our previous data showing that maternal ethanol (EtOH) exposure in mice resulted in an immediate reduction in cranially directed fetal blood flow, we hypothesized that such exposure would also result in persistent alterations in cranially directed blood flow in the prenatally alcohol-exposed (PAE) adult...
January 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/27955971/utility-of-point-of-care-assessment-of-platelet-reactivity-using-the-pfa-100%C3%A2-to-aid-in-diagnosis-of-stroke
#20
Claire Pearson, Karin Przyklenk, Valerie H Mika, Syed Imran Ayaz, Morgan Ellis, Preet Varade, Rosa Tolomello, Robert D Welch
BACKGROUND: Rapid and accurate diagnosis of patients presenting with symptoms of stroke is needed to facilitate the timely delivery of proven effective treatment for patients with acute ischemic stroke (AIS). The aim of this study was to determine whether early assessment of platelet reactivity in patients presenting with symptoms of AIS was associated with a diagnosis of AIS, transient ischemic attack (TIA), or stroke mimic. METHODS: This prospective study included patients with symptoms of AIS treated at an inner-city emergency department (ED)...
November 15, 2016: American Journal of Emergency Medicine
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