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Cerebral hemodynamic

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https://www.readbyqxmd.com/read/29924461/short-term-external-counterpulsation-augments-cerebral-blood-flow-and-tissue-oxygenation-in-chronic-cerebrovascular-occlusive-disease
#1
Eva E Buschmann, Philipp Hillmeister, Anja Bondke Persson, David S Liebeskind, Lea Schlich, Robert Kamenzky, Andreas Busjahn, Ivo R Buschmann, Peter Bramlage, Andreas Hetzel, Matthias Reinhard
BACKGROUND: External counterpulsation improves cerebral perfusion velocity in acute stroke and may stimulate collateral artery growth. However, whether (non-acute) at-risk patients with high-grade carotid artery disease may benefit from counterpulsation needs to be validated. METHODS: Twenty-eight patients (71±6.5 years, 5 women) with asymptomatic unilateral chronic severe ICA stenosis (>70%) or occlusion were randomized to receive 20 min active counterpulsation followed by sham treatment or vice versa...
June 20, 2018: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29917211/cardiocerebral-protective-effects-of-dexmedetomidine-as-anesthetic-in-colorectal-cancer-surgery
#2
X-L Yi, J-T Wang, C-Q Chu, Y-X Li, J-H Yin, S-L Liu
OBJECTIVE: To explore the cardiocerebral protective effect of dexmedetomidine as an anesthetic in colorectal cancer surgery. PATIENTS AND METHODS: A total of 246 colorectal cancer patients were enrolled in this retrospective analysis. Those patients were admitted to the Affiliated Hospital of Qingdao University and underwent surgery from July 2014 to July 2016. The patients were divided into observation group and control group according to the anesthetic used in surgery...
June 2018: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29913284/effect-sizes-of-bold-cvr-resting-state-signal-fluctuations-and-time-delay-measures-for-the-assessment-of-hemodynamic-impairment-in-carotid-occlusion-patients
#3
Jill B De Vis, Alex A Bhogal, Jeroen Hendrikse, Esben T Petersen, Jeroen C W Siero
BACKGROUND AND PURPOSE: The BOLD signal amplitude as a response to a hypercapnia stimulus is commonly used to assess cerebrovascular reserve. Despite recent advances, the implementation remains cumbersome and alternative ways to assess hemodynamic impairment are desirable. Resting-state BOLD signal fluctuations (rsBOLD) have been proposed however data on its sensitivity and dependence on baseline venous cerebral blood volume (vCBV) is limited. The primary aim of this study was to compare the effect sizes of resting-state and hypercapnia induced BOLD signal changes in the detection of hemodynamic impairment...
June 15, 2018: NeuroImage
https://www.readbyqxmd.com/read/29912298/cocaine-decreases-spontaneous-neuronal-activity-and-increases-low-frequency-neuronal-and-hemodynamic-cortical-oscillations
#4
Wei Chen, Nora D Volkow, James Li, Yingtian Pan, Congwu Du
Low-frequency oscillations (LFOs) in hemodynamics assessed by fMRI reflect synchronized neuronal activities and are the basis for mapping brain function and its disruption by drugs and disease. Here we assess if cocaine disrupts coupling between neuronal and vascular LFOs by simultaneously measuring cortical field potentials (FP) and cerebral blood flow (CBF) regarding their LFOs (0-1 Hz) spectral bandwidths in the somatosensory cortex of naïve and chronic cocaine-exposed rats at baseline and during cocaine intoxication...
April 18, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29907385/long-term-changes-in-cerebrovascular-reactivity-following-ec-ic-bypass-for-intracranial-steno-occlusive-disease
#5
Casey Rosen, Larissa McKetton, Jeremy Russell, Kevin Sam, Julien Poublanc, Adrian Crawley, Jay S Han, Olivia Sobczyk, James Duffin, Danny M Mandell, Michael Tymianski, Joseph A Fisher, David J Mikulis, Lashmi Venkatraghavan
The purpose of this retrospective observational study is to investigate the long-term changes in cerebrovascular reactivity (CVR) as a measure of cerebral hemodynamics in patients with intracranial steno-occlusive disease (IC-SOD) after they have undergone an Extracranial-intracranial (EC-IC) bypass. Twenty-six patients suffering from IC-SOD were selected from our CVR database. Nineteen patients underwent unilateral and 7 underwent bilateral revascularization. CVR measurements were done using BOLD-MRI and precisely controlled CO2 and expressed as ΔBOLD (%)/Δ PET CO2 (mmHg)...
June 12, 2018: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29905038/in-vivo-precision-assessment-of-a-near-infrared-spectroscopy-based-tissue-oximeter-oxyprem-v1-3-in-neonates-considering-systemic-hemodynamic-fluctuations
#6
Stefan Kleiser, Daniel Ostojic, Nassim Nasseri, Helene Isler, Hans Ulrich Bucher, Dirk Bassler, Martin Wolf, Felix Scholkmann, Tanja Karen
The aim was to determine the precision of a noninvasive near-infrared spectroscopy (NIRS)-based tissue oximeter (OxyPrem v1.3). Using a linear mixed-effects model, we quantified the variability for cerebral tissue oxygenation (StO2) measurements in 35 preterm neonates to be 2.64%, a value that meets the often-articulated clinicians' demand for a precise tissue oxygenation measurement. We showed that the variability of StO2 values measured was dominated by spontaneous systemic hemodynamic fluctuations during the measurement, meaning that precision of the instrument was actually even better...
June 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29904854/migraineurs-with-aura-present-an-increased-cerebral-hemodynamics-in-the-anterior-and-posterior-circulation-compared-with-stroke-patients-and-controls
#7
Claudia Altamura, Matteo Paolucci, Nicoletta Brunelli, Angelo Cascio Rizzo, Federica Assenza, Fabrizio Vernieri
No abstract text is available yet for this article.
June 2018: Neurological Sciences
https://www.readbyqxmd.com/read/29898143/predictors-of-outcomes-after-correction-of-acute-type-a-aortic-dissection-under-moderate-hypothermic-circulatory-arrest-and-antegrade-cerebral-perfusion
#8
George Samanidis, Charalampos Katselis, Constantinos Contrafouris, Georgios Georgiopoulos, Ioannis Kriaras, Theofani Antoniou, Konstantinos Perreas
INTRODUCTION: Hypothermic circulatory arrest is widely used for correction of acute type A aortic dissection pathology. We present our experience of 45 consecutive patients operated in our unit with bilateral antegrade cerebral perfusion and moderate hypothermic circulatory arrest. METHODS: Between January 2011 and April 2015, 45 consecutive patients were admitted for acute type A aortic dissection and operated emergently under moderate hypothermic circulatory arrest and bilateral antegrade cerebral perfusion...
March 2018: Brazilian Journal of Cardiovascular Surgery
https://www.readbyqxmd.com/read/29894771/cns-distribution-signalling-properties-and-central-effects-of-g-protein-coupled-receptor-4
#9
P S Hosford, V Mosienko, K Kishi, G Jurisic, K Seuwen, B Kinzel, M G Ludwig, J A Wells, I N Christie, L Koolen, A P Abdala, B H Liu, A V Gourine, A G Teschemacher, S Kasparov
Information on the distribution and biology of the G-protein coupled receptor 4 (GPR4) in the brain is limited. It is currently thought that GPR4 couples to Gs proteins and may mediate central respiratory sensitivity to CO2 . Using a knock-in mouse model, abundant GPR4 expression was detected in the cerebrovascular endothelium and neurones of dorsal raphe, retro-trapezoidal nucleus locus coeruleus and lateral septum. A similar distribution was confirmed using RNAscope in situ hybridisation. In HEK293 cells, overexpressing GPR4, it was highly constitutively active at neutral pH with little further increase in cAMP towards acidic pH...
June 9, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29894343/anesthetic-management-of-a-patient-with-ongoing-thrombolytic-therapy-during-decompressive-craniectomy-a-case-report
#10
Nicole Souper, Claudia Jiménez, Felipe Maldonado
Decompressive craniectomy (DC) is a therapeutic alternative for reducing intracranial pressure after a middle cerebral artery stroke. If thrombolytic therapy is administered, craniectomy is usually postponed for at least 24 hours due to a risk of severe bleeding. We describe a case in which DC was performed on a 38-year-old man who received thrombolytic therapy for an ischemic stroke involving the middle cerebral artery. His neurological and hemodynamic status worsened during its administration, and DC was performed 6 hours after thrombolysis was performed...
June 11, 2018: A&A practice
https://www.readbyqxmd.com/read/29891575/education-research-variation-in-priorities-for-neurocritical-care-education-expressed-across-role-groups
#11
Abigail S Cohen, Saef Izzy, Monisha A Kumar, Cara J Joyce, Stephen A Figueroa, Matthew B Maas, Christiana E Hall, David L McDonagh, David P Lerner, Paul M Vespa, Lori A Shutter, Eric S Rosenthal
OBJECTIVE: To define expectations for neurocritical care (NCC) core competencies vs competencies considered within the domain of other subspecialists. METHODS: An electronic survey was disseminated nationally to NCC nurses, physicians, fellows, and neurology residents through Accreditation Council for Graduate Medical Education neurology residency program directors, United Council for Neurologic Subspecialties neurocritical care fellowship program directors, and members of the Neurocritical Care Society...
June 12, 2018: Neurology
https://www.readbyqxmd.com/read/29886568/hemodynamic-adaptation-to-suboptimal-fetal-growth-in-patients-with-single-ventricle-physiology
#12
Tarek Alsaied, Stephanie Tseng, Eileen King, Eunice Hahn, Allison Divanovic, Mounira Habli, James Cnota
BACKGROUND: In fetuses with structurally normal heart and suboptimal fetal growth (SFG), umbilical artery vascular resistance increases as measured by umbilical artery pulsatility index (UA-PI). The objective of this study is to compare hemodynamic responses to SFG in fetuses with single ventricle (SV) and controls with structurally normal heart. METHODS: Fetal echocardiograms around 30 weeks of gestation were reviewed. UA-PI and middle cerebral artery pulsatility index (MCA-PI) were calculated...
June 10, 2018: Echocardiography
https://www.readbyqxmd.com/read/29877854/near-infrared-spectroscopy-study-of-cortical-excitability-during-electrical-stimulation-assisted-cycling-for-neurorehabilitation-of-stroke-patients
#13
Chao-Chen Lo, Pei-Yi Lin, Zheng-Yu Hoe, Jia-Jin J Chen
In addition to generating functional limb movement via electrical stimulation, other research proposed lower intensity stimulation for stroke patients from proprioceptive and neuro-biofeedback aspects. This paper investigates the effects of different intensity levels of electrical stimulation during passive cycling on cortical activation using multichannel near infrared spectroscopy (NIRS) covering premotor cortex, supplementary motor area, sensorimotor cortex (SMC), and secondary sensory cortex (S2) regions...
June 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29877850/an-fnirs-based-feature-learning-and-classification-framework-to-distinguish-hemodynamic-patterns-in-children-who-stutter
#14
Rahilsadat Hosseini, Bridget Walsh, Fenghua Tian, Shouyi Wang
Stuttering is a communication disorder that affects approximately 1% of the population. Although 5-8% of preschool children begin to stutter, the majority will recover with or without intervention. There is a significant gap, however, in our understanding of why many children recover from stuttering while others persist and stutter throughout their lives. Detecting neurophysiological biomarkers of stuttering persistence is a critical objective of this paper. In this paper, we developed a novel supervised sparse feature learning approach to discover discriminative biomarkers from functional near infrared spectroscopy (fNIRS) brain imaging data recorded during a speech production experiment from 46 children in three groups: children who stutter ( ); children who do not stutter ( ); and children who recovered from stuttering ( )...
June 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29875115/multimodal-neuromonitoring-in-neurocritical-care
#15
Sarah H Peacock, Amanda D Tomlinson
Neuromonitoring is important for patients with acute brain injury. The bedside neurologic examination is standard for neurologic monitoring; however, a clinical examination may not reliably detect subtle changes in intracranial physiology. Changes found during neurologic examinations are often late signs. The assessment of multiple physiological variables in real time can provide new clinical insights into treatment decisions. No single monitoring modality is ideal for all patients. Simultaneous assessment of cerebral hemodynamics, oxygenation, and metabolism, such as in multimodal monitoring, allows an innovative approach to individualized patient care...
2018: AACN Advanced Critical Care
https://www.readbyqxmd.com/read/29869933/spatial-coefficient-of-variation-in-pseudo-continuous-arterial-spin-labeling-cerebral-blood-flow-images-as-a-hemodynamic-measure-for-cerebrovascular-steno-occlusive-disease-a-comparative-15-o-positron-emission-tomography-study
#16
Masanobu Ibaraki, Kazuhiro Nakamura, Hideto Toyoshima, Kazuhiro Takahashi, Keisuke Matsubara, Atsushi Umetsu, Josef Pfeuffer, Hideto Kuribayashi, Toshibumi Kinoshita
Pseudo-continuous arterial spin labeling (pCASL) is a completely non-invasive method of cerebral perfusion measurement. However, cerebral blood flow (CBF) quantification is hampered by arterial transit artifacts characterized by bright vascular signals surrounded by decreased signals in tissue regions, which commonly appear in patients with reduced cerebral perfusion pressure. The spatial coefficient of variation (CoV) of pCASL CBF images has been proposed as an alternative region-of-interest (ROI)-based hemodynamic measure to predict prolonged arterial transit time (ATT)...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29868521/measuring-near-infrared-spectroscopy-derived-cerebral-autoregulation-in-neonates-from-research-tool-toward-bedside-multimodal-monitoring
#17
REVIEW
Liesbeth Thewissen, Alexander Caicedo, Petra Lemmers, Frank Van Bel, Sabine Van Huffel, Gunnar Naulaers
Introduction: Cerebral autoregulation (CAR), the ability of the human body to maintain cerebral blood flow (CBF) in a wide range of perfusion pressures, can be calculated by describing the relation between arterial blood pressure (ABP) and cerebral oxygen saturation measured by near-infrared spectroscopy (NIRS). In literature, disturbed CAR is described in different patient groups, using multiple measurement techniques and mathematical models. Furthermore, it is unclear to what extent cerebral pathology and outcome can be explained by impaired CAR...
2018: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/29867713/cerebral-lactate-concentration-in-neonatal-hypoxic-ischemic-encephalopathy-in-relation-to-time-characteristic-of-injury-and-serum-lactate-concentration
#18
Tai-Wei Wu, Benita Tamrazi, Kai-Hsiang Hsu, Eugenia Ho, Aaron J Reitman, Matthew Borzage, Stefan Blüml, Jessica L Wisnowski
Background: Cerebral lactate concentration can remain detectable in neonatal hypoxic-ischemic encephalopathy (HIE) after hemodynamic stability. The temporal resolution of regional cerebral lactate concentration in relation to the severity or area of injury is unclear. Furthermore, the interplay between serum and cerebral lactate in neonatal HIE has not been well defined. The study aims to describe cerebral lactate concentration in neonatal HIE in relation to time, injury, and serum lactate...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29859676/preoperative-cerebral-hemodynamics-from-birth-to-surgery-in-neonates-with-critical-congenital-heart-disease
#19
Jennifer M Lynch, Tiffany Ko, David R Busch, John J Newland, Madeline E Winters, Kobina Mensah-Brown, Timothy W Boorady, Rui Xiao, Susan C Nicolson, Lisa M Montenegro, J William Gaynor, Thomas L Spray, Arjun G Yodh, Maryam Y Naim, Daniel J Licht
BACKGROUND: Hypoxic-ischemic white matter brain injury commonly occurs in neonates with critical congenital heart disease. Recent work has shown that longer time to surgery is associated with increased risk for this injury. In this study we investigated changes in perinatal cerebral hemodynamics during the transition from fetal to neonatal circulation to ascertain mechanisms that might underlie this risk. METHODS: Neonates with either transposition of the great arteries (TGA) or hypoplastic left heart syndrome (HLHS) were recruited for preoperative noninvasive optical monitoring of cerebral oxygen saturation, cerebral oxygen extraction fraction, and cerebral blood flow using diffuse optical spectroscopy and diffuse correlation spectroscopy, 2 noninvasive optical techniques...
May 3, 2018: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29858399/correlation-between-angiographic-stenosis-and-physiologic-venous-sinus-outflow-obstruction-in-idiopathic-intracranial-hypertension
#20
James L West, Garret P Greenway, Rebecca M Garner, Carol A Aschenbrenner, Jasmeet Singh, Stacey Q Wolfe, Kyle M Fargen
INTRODUCTION: The relationship between degree of angiographic venous sinus stenosis and the trans-stenosis pressure gradient magnitude in idiopathic intracranial hypertension (IIH) is poorly understood. The present study aimed to assess the utility of angiography, venography, and non-invasive imaging (MRV or CTV) for the diagnosis and characterization of clinically significant VSS. METHODS: Retrospective analysis of a prospectively collected database was performed to identify patients with medically refractory IIH who were evaluated by angiography and venous manometry for the presence of VSS with associated clinically significant pressure gradient...
June 1, 2018: Journal of Neurointerventional Surgery
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