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cerebrovascular reserve

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https://www.readbyqxmd.com/read/29146719/can-arterial-spin-labeling-with-multiple-postlabeling-delays-predict-cerebrovascular-reserve
#1
H J Choi, C-H Sohn, S-H You, R-E Yoo, K M Kang, T J Yun, S H Choi, J-H Kim, W-S Cho, J E Kim
BACKGROUND AND PURPOSE: The effect of delayed transit time is the main source of error in the quantitative measurement of CBF in arterial spin-labeling. In the present study, we evaluated the usefulness of the transit time-corrected CBF and arterial transit time delay from multiple postlabeling delays arterial spin-labeling compared with basal/acetazolamide stress technetium Tc99m-hexamethylpropylene amineoxime (Tc99m-HMPAO) SPECT in predicting impairment in the cerebrovascular reserve...
November 16, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29103148/cerebrovascular-co2-reactivity-during-isoflurane-nitrous-oxide-anesthesia-in-patients-with-chronic-renal-failure
#2
Kazuyoshi Ishida, Masato Uchida, Kohji Utada, Atsuo Yamashita, Satoshi Yamashita, Shiro Fukuda, Mishiya Matsumoto, Takefumi Sakabe
PURPOSE: We assessed the cerebrovascular CO2 reactivity (CO2R) in chronic renal failure (CRF) patients without diabetes mellitus (DM), uncontrolled hypertension, peripheral vascular disease, or neurological disease under isoflurane-nitrous oxide anesthesia. METHODS: Forty-nine patients undergoing surgery, including 36 CRF patients (30 receiving dialysis and six pre-dialysis patients) and 13 patients without CRF (controls). Middle cerebral artery flow velocity (VMCA) was measured by transcranial Doppler ultrasonography at an end-tidal CO2 of 35 to 45 mmHg...
November 4, 2017: Journal of Anesthesia
https://www.readbyqxmd.com/read/29102362/drug-eluting-stents-in-elderly-patients-with-coronary-artery-disease-senior-a-randomised-single-blind-trial
#3
Olivier Varenne, Stéphane Cook, Georgios Sideris, Sasko Kedev, Thomas Cuisset, Didier Carrié, Thomas Hovasse, Philippe Garot, Rami El Mahmoud, Christian Spaulding, Gérard Helft, José F Diaz Fernandez, Salvatore Brugaletta, Eduardo Pinar-Bermudez, Josepa Mauri Ferre, Philippe Commeau, Emmanuel Teiger, Kris Bogaerts, Manel Sabate, Marie-Claude Morice, Peter R Sinnaeve
BACKGROUND: Elderly patients regularly receive bare-metal stents (BMS) instead of drug-eluting stents (DES) to shorten the duration of double antiplatelet therapy (DAPT). The aim of this study was to compare outcomes between these two types of stents with a short duration of DAPT in such patients. METHODS: In this randomised single-blind trial, we recruited patients from 44 centres in nine countries. Patients were eligible if they were aged 75 years or older; had stable angina, silent ischaemia, or an acute coronary syndrome; and had at least one coronary artery with a stenosis of at least 70% (≥50% for the left main stem) deemed eligible for percutaneous coronary intervention (PCI)...
October 31, 2017: Lancet
https://www.readbyqxmd.com/read/29066902/effects-of-sevoflurane-versus-propofol-on-cerebrovascular-reactivity-to-carbon-dioxide-during-laparoscopic-surgery
#4
Chunyi Wang, Cheng Ni, Gang Li, Yan Li, Liyuan Tao, Nan Li, Jun Wang, Xiangyang Guo
PURPOSE: Cerebrovascular reactivity to carbon dioxide (CVR-CO2) reflects cerebrovascular reserve capacity, which is important in many brain disorders, including cerebrovascular and Alzheimer's diseases. Meanwhile, there is a relationship between CVR-CO2 and cognitive function. Therefore, the study is aimed at investigating the effects of sevoflurane versus propofol on CVR-CO2 during laparoscopic surgery, as well as the role of CVR-CO2 on cognitive function during perioperative period...
2017: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/29064737/effects-of-apoe-haplotypes-and-measures-of-cardiovascular-risk-over-gender-dependent-cognitive-and-functional-changes-in-one-year-in-alzheimer-s-disease
#5
Fabricio Ferreira de Oliveira, Fernando Vieira Pereira, Glaucia Akiko Kamikado Pivi, Marilia Cardoso Smith, Paulo Henrique Ferreira Bertolucci
BACKGROUND: Illiteracy, high cerebrovascular risk and copies of APOE-ϵ4 are risk factors for Alzheimer's disease dementia (AD). We aimed to investigate the impacts of gender, education, coronary heart disease (CHD) risk and creatinine clearance variations, body mass index (BMI) and APOE haplotypes over the rates of cognitive and functional decline of AD in one year. METHODS: Consecutive outpatients with late-onset AD were assessed for gender, schooling, BMI and APOE haplotypes, variations in one year of creatinine clearance and Framingham projections of the 10-year absolute CHD risk, and prospective scores of the Mini-Mental State Examination (MMSE), the Clinical Dementia Rating Sum-of-Boxes (CDR-SOB), the Index of Independence in Activities of Daily Living (ADL) and Lawton's Scale for Instrumental Activities of Daily Living (IADL)...
October 24, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/29055168/long-term-safety-of-growth-hormone-a-combined-registry-analysis
#6
Kirstine Stochholm, Wieland Kiess
OBJECTIVES: Preliminary data from the French cohort of the Safety and Appropriateness of Growth hormone treatments in Europe (SAGhE) study raised concerns regarding the safety of recombinant human GH, suggesting that GH may increase mortality and incidence of stroke in patients treated during childhood for GH deficiency or short stature. We evaluated published safety data, focusing on mortality, neoplasms, cerebrovascular events and diabetes across a number of large-scale pharmaceutical company GH registries...
October 21, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/29055086/acute-mitogen-activated-protein-kinase-1-2-inhibition-improves-functional-recovery-and-vascular-changes-after-ischemic-stroke-in-rat-monitored-by-9-4-t-magnetic-resonance-imaging
#7
Maryam Mostajeran, Friedrich Wetterling, Frank W Blixt, Lars Edvinsson, Saema Ansar
AIM: The aim was to evaluate the beneficial effect of early mitogen activated protein kinase (MEK)1/2 inhibition administered at a clinical relevant time-point using the transient middle cerebral artery occlusion model and a dedicated rodent magnetic resonance imaging system (9.4T) to monitor cerebrovascular changes non-invasively for two weeks. METHOD: Transient middle cerebral artery occlusion was induced in male rats for two hours followed by reperfusion. The specific MEK1/2 inhibitor U0126 was administered i...
October 21, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/29053903/galectin-3-an-emerging-biomarker-in-stroke-and-cerebrovascular-diseases
#8
Anand Venkatraman, Shalaka Hardas, Nirav Patel, Navkaranbir Singh Bajaj, Garima Arora, Pankaj Arora
BACKGROUND: The carbohydrate-binding molecule Galectin-3 has garnered significant attention recently as a biomarker for various conditions ranging from cardiac disease to obesity. Though there have been several recent studies investigating its role in stroke and other cerebrovascular diseases, awareness of this emerging biomarker in the wider neurology community is limited. METHODS: We performed a systematic search in PubMed, EMBASE, Scopus, CINAHL, Clinicaltrials...
October 20, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29031532/neuroimaging-of-vascular-reserve-in-patients-with-cerebrovascular-diseases
#9
REVIEW
Meher R Juttukonda, Manus J Donahue
Cerebrovascular reactivity, defined broadly as the ability of brain parenchyma to adjust cerebral blood flow in response to altered metabolic demand or a vasoactive stimulus, is being measured with increasing frequency and may have a use for portending new or recurrent stroke risk in patients with cerebrovascular disease. The purpose of this review is to outline (i) the physiological basis of variations in cerebrovascular reactivity, (ii) available approaches for measuring cerebrovascular reactivity in research and clinical settings, and (iii) clinically-relevant cerebrovascular reactivity findings in the context of patients with cerebrovascular disease, including atherosclerotic arterial steno-occlusion, non-atherosclerotic arterial steno-occlusion, anemia, and aging...
October 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28925529/cerebrovascular-response-to-the-cold-pressor-test-the-critical-role-of-carbon-dioxide
#10
Michael M Tymko, Thijs P Kerstens, Kevin W Wildfong, Philip N Ainslie
In addition to increasing sympathetic nervous activity, blood pressure, and cerebral blood flow (CBF), the cold pressor test (CPT) stimulates pain receptors, which may increase ventilation above metabolic demand; this response likely reduces the partial pressure of end-tidal carbon dioxide (PET CO2 ), and will attenuate elevations in CBF. We hypothesized: (1) CPT would elicit hyperventilation, effectively lowering PET CO2 ; (2) the CBF response will be elevated during an isocapnic (controlled PET CO2 ), compared to a poikilocapnic CPT (uncontrolled PET CO2 ); (3) In response to CPT, the common carotid artery (CCA) will vasodilatate, while the internal carotid artery (ICA) will remain unchanged to help regulate CBF...
September 19, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28888042/effect-of-a-multinutrient-intervention-after-ischemic-stroke-in-female-c57bl-6-mice
#11
Maximilian Wiesmann, Nienke M Timmer, Bastian Zinnhardt, Dirk Reinhard, Sarah Eligehausen, Anja Königs, Hasnae Ben Jeddi, Pieter J Dederen, Andreas H Jacobs, Amanda J Kiliaan
Stroke can affect females very differently from males, and therefore preclinical research on underlying mechanisms and the effects of interventions should not be restricted to male subjects, and treatment strategies for stroke should be tailored to benefit both sexes. Previously, we demonstrated that a multinutrient intervention (Fortasyn) improved impairments after ischemic stroke induction in male C57Bl/6 mice, but the therapeutic potential of this dietary treatment remained to be investigated in females...
September 9, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28887858/liver-transplantation-equity-supply-demand-and-access
#12
EDITORIAL
David Axelrod, Heidi Yeh
No abstract text is available yet for this article.
September 9, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28884722/-severe-carotid-stenosis-cerebral-autoregulation-in-the-ipsilateral-region
#13
V B Semenyutin, G А Asaturyan, А А Nikiforova, G К Panuntsev, V A Aliev, V B Iblyaminov, A V Savello, А Patzak, K V Laptev, I P Dudanov, О А Pavlov
AIM: To study cerebral autoregulation (CA) in region of the stenotic carotid artery. MATERIAL AND METHODS: The study involved 35 patients with critical stenosis of the carotid arteries, including 24 patients were asymptomatic and 11 patients with symptomatic course. Blood flow velocity in middle cerebral arteries was monitored using Multi Dop X (DWL, Germany) with simultaneous noninvasive systemic blood pressure registration (CNAP, Austria). CA was assessed by calculating the phase shift (PS) between spontaneous oscillations of blood flow velocity and blood pressure within the range of systemic Mayer waves (80-120 mHz)...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/28881037/comparison-of-vessel-enhancement-algorithms-applied-to-time-of-flight-mra-images-for-cerebrovascular-segmentation
#14
Renzo Phellan, Nils D Forkert
PURPOSE: Vessel enhancement algorithms are often used as a preprocessing step for vessel segmentation in medical images to improve the overall segmentation accuracy. Each algorithm uses different characteristics to enhance vessels, such that the most suitable algorithm may vary for different applications. This paper presents a comparative analysis of the accuracy gains in vessel segmentation generated by the use of nine vessel enhancement algorithms: Multiscale vesselness using the formulas described by Erdt (MSE), Frangi (MSF), and Sato (MSS), optimally oriented flux (OOF), ranking orientations responses path operator (RORPO), the regularized Perona-Malik approach (RPM), vessel enhanced diffusion (VED), hybrid diffusion with continuous switch (HDCS), and the white top hat algorithm (WTH)...
September 7, 2017: Medical Physics
https://www.readbyqxmd.com/read/28866449/fractional-flow-reserve-in-below-the-knee-arteries-with-critical-limb-ischemia-and-validation-against-gold-standard-morphologic-functional-measures-and-long-term-clinical-outcomes
#15
Zoltán Ruzsa, Szilárd Róna, Gábor G Tóth, Péter Sótonyi, Olivier F Bertrand, Balázs Nemes, Béla Merkely, Kálmán Hüttl
INTRODUCTION: The aim of this study was to assess the applicability of fractional flow reserve measurement (FFR) in below-the-knee (BTK) arteries and to evaluate its correlation with non-invasive functional parameters before and after angioplasty. METHODS: We enrolled 39 patients with severe BTK arterial lesions. Inclusion criteria were critical limb ischemia (Rutherford 4-6) and angiographically proven arterial stenosis of the distal lower limb (percent diameter stenosis ≥70%)...
July 18, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28865157/acute-simvastatin-treatment-restores-cerebral-functional-capillary-density-and-attenuates-angiotensin-ii-induced-microcirculatory-changes-in-a-model-of-primary-hypertension
#16
Felipe Freitas, Vanessa Estato, Patricia Reis, Hugo C Castro-Faria-Neto, Vinícius Carvalho, Rafael Torres, Marcos A Lessa, Eduardo Tibiriçá
OBJECTIVE: We investigated the acute effects of simvastatin on cerebral microvascular rarefaction and dysfunction in spontaneously hypertensive rats (SHRs). METHODS: Male Wistar Kyoto rats (WKY) and SHRs were divided into 4 groups of 8 animals each: WKY-CTL and SHR-CTL, treated with 0.9% saline; and WKY+SIM and SHR+SIM, treated with simvastatin (30 mg/kg/day) for 3 days by gavage. Cerebral functional capillary density (FCD) was assessed by intravital fluorescence videomicroscopy...
September 2, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/28845890/long-term-aspirin-does-not-lower-risk-of-stroke-and-increases-bleeding-risk-in-low-risk-atrial-fibrillation-ablation-patients
#17
Victoria Jacobs, Heidi T May, Tami L Bair, Brian G Crandall, Michael J Cutler DO, John D Day, Charles Mallender, Jeffrey S Osborn, J Peter Weiss, T Jared Bunch
BACKGROUND: Stroke risk is a significant concern in patients with atrial fibrillation (AF). Low stroke risk patients (CHADS2 VASc 0-2) are often treated long-term with aspirin after catheter ablation. Defining the long-term risks versus benefits of aspirin therapy, after an ablation, is essential to validate this common clinical approach. METHODS: A total of 4,124 AF ablation patients undergoing their index ablation were included in this retrospective observational study...
November 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28844469/a-systematic-review-of-primary-endovascular-repair-of-the-ascending-aorta
#18
REVIEW
Corbin E Muetterties, Rohan Menon, Grayson H Wheatley
OBJECTIVE: Endovascular repair of the ascending aorta is currently limited to patients at high surgical risk with aortic diseases originating above the sinotubular junction. A number of different endovascular technologies and approaches have been used, although no consensus exists regarding a standardized technique. To better understand real-world endovascular approaches to the ascending aorta, we performed a comprehensive review of the types of endovascular aortic stents and associated vascular access used in repair of the ascending aorta...
August 22, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28833160/the-role-of-exercise-in-mitigating-subcortical-ischemic-vascular-cognitive-impairment
#19
REVIEW
Elizabeth Dao, Ging-Yuek Robin Hsiung, Teresa Liu-Ambrose
Subcortical ischemic vascular cognitive impairment (SIVCI) is the most preventable form of cognitive dysfunction. There is converging evidence from animal and human studies that indicate vascular injury as the primary cause of SIVCI. Currently, there are no curative pharmaceutical treatments for vascular dementia; however, exercise may be a promising strategy to combat SIVCI. This review will focus on the role of exercise as a strategy to prevent or slow the progression of SIVCI, with particular emphasis on the mechanisms by which exercise may improve cerebrovascular function...
August 21, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28820303/rapid-ventricular-pacing-for-clip-reconstruction-of-complex-unruptured-intracranial-aneurysms-results-of-an-interdisciplinary-prospective-trial
#20
Juergen Konczalla, Johannes Platz, Stephan Fichtlscherer, Haitham Mutlak, Ulrich Strouhal, Volker Seifert
OBJECTIVE To date, treatment of complex unruptured intracranial aneurysms (UIAs) remains challenging. Therefore, advanced techniques are required to achieve an optimal result in treating these patients safely. In this study, the safety and efficacy of rapid ventricular pacing (RVP) to facilitate microsurgical clip reconstruction was investigated prospectively in a joined neurosurgery, anesthesiology, and cardiology study. METHODS Patients with complex UIAs were prospectively enrolled. Both the safety and efficacy of RVP were evaluated by recording cardiovascular events and outcomes of patients as well as the amount of aneurysm occlusion after the surgical clip reconstruction procedure...
August 18, 2017: Journal of Neurosurgery
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