keyword
MENU ▼
Read by QxMD icon Read
search

Mean cerebral blood flow

keyword
https://www.readbyqxmd.com/read/28526782/acute-impact-of-drinking-coffee-on-the-cerebral-and-systemic-vasculature
#1
Takuro Washio, Hiroyuki Sasaki, Shigehiko Ogoh
Previous studies have suggested that the risk of ischemic stroke increases immediately after drinking coffee. Indeed, drinking coffee, that is, caffeine, acutely increases arterial stiffness as well as blood pressure and peripheral vascular resistance. On the other hand, it has been reported that arterial stiffening is associated with elevation in the pulsatility index (PI) of cerebral blood flow (CBF), which increases the risk of brain disease. However, the effect of drinking coffee on the PI of the CBF and its interaction with arterial stiffness remain unknown...
May 2017: Physiological Reports
https://www.readbyqxmd.com/read/28512500/the-effect-of-chunghyul-dan-on-hyperventilation-induced-carbon-dioxide-reactivity-of-the-middle-cerebral-artery-in-normal-subjects-a-dose-dependent-study
#2
Chul Jin, Sang-Kwan Moon, Seung-Yeon Cho, Seong-Uk Park, Woo-Sang Jung, Jung-Mi Park, Chang-Nam Ko, Ki-Ho Cho, Seungwon Kwon
Background. This study was conducted to show the prompt effect of chunghyul-dan (CHD) on cerebral hemodynamics in order to provide evidence for its use in stroke prevention. Methods. Hyperventilation-induced CO2 reactivity of the middle cerebral artery was measured in 12 healthy male volunteers (mean age: 26.3 ± 1.1 years) using transcranial Doppler sonography. All subjects were examined before and for 3 hours after administration, with an interval of 1 week between measurements. Results. Compared to baseline, the CO2 reactivity of the middle cerebral artery increased significantly at 2 and 3 hours after the administration of CHD (600 mg and 1200 mg)...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28505975/reduced-cardiovascular-functions-in%C3%A2-patients-with-alzheimer-s-disease
#3
Wang-Sheng Jin, Xian-Le Bu, Ye-Ran Wang, Ling Li, Wei-Wei Li, Yu-Hui Liu, Chi Zhu, Xiu-Qing Yao, Yang Chen, Chang-Yue Gao, Tao Zhang, Chang-Yue Gao, Hua-Dong Zhou, Fan Zeng, Yan-Jiang Wang
Previous studies have suggested that cardiovascular functions might play a critical role in Alzheimer's disease (AD) pathogenesis. However, the relationship among heart function, blood flow of cerebral vessels, and AD remains unclear. In the present study, AD patients (n = 34) and age- and gender-matched cognitively normal controls (n = 34) were recruited. Comorbidity information was collected. The ejection fraction was measured using echocardiography, and the mean velocity, pulsatility index (PI), and resistance index (RI) of the basilar artery (BA), left terminal internal carotid artery (LTICA), and right terminal internal carotid artery (RTICA) were measured using transcranial Doppler...
May 11, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28499862/successful-revascularization-of-aortic-arch-in-a-39-year-old-blunt-trauma-patient-with-acute-diffuse-axonal-injury-without-the-use-of-systemic-anticoagulation
#4
Andrew M Abi-Chaker, Keith M Jones, Priscilla Sanchez, Jordan Sasson, Xiaoyi Li, Jorge Rey
BACKGROUND: Blunt traumatic aortic injury is the second leading cause of death in trauma patients age 4 to 34. Of the patients that are able to receive treatment, mortality rates as high as 40% have been reported. Endovascular repair options have allowed for more expeditious repairs with reduced iatrogenic trauma; however, when the injury involves the ascending aorta or arch, current endografts lack fenestrations needed for cerebral blood flow. Traditionally, on pump cardiopulmonary bypass with systemic anticoagulation has been used to repair these injuries...
May 9, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28497934/cerebral-autoregulation-monitoring-in-acute-traumatic-brain-injury-what-s-the-evidence
#5
Leanne A Calviello, Joseph Donnelly, Frederick A Zeiler, Eric P Thelin, Peter Smielewski, Marek Czosnyka
Cerebral autoregulation is conceptualized as a vascular self-regulatory mechanism within the brain. Controlled by elusive relationships between various biophysical processes, it functions to protect the brain against potential damages caused by sudden changes in cerebral perfusion pressures and flow. Following events such as traumatic brain injuries (TBI), autoregulation may be compromised, potentially leading to an unfavorable outcome. In spite of its complexity, autoregulation has been able to be quantified non-invasively within the neuro-critical care setting with the aid of transcranial Doppler...
May 12, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28492488/redistribution-of-cerebral-blood-flow-during-severe-hypovolemia-and-reperfusion-in-a-sheep-model-critical-role-of-%C3%AE-1-adrenergic-signaling
#6
René Schiffner, Sabine Juliane Bischoff, Thomas Lehmann, Florian Rakers, Sven Rupprecht, Juliane Reiche, Georg Matziolis, Harald Schubert, Matthias Schwab, Otmar Huber, Martin Schmidt
BACKGROUND: Maintenance of brain circulation during shock is sufficient to prevent subcortical injury but the cerebral cortex is not spared. This suggests area-specific regulation of cerebral blood flow (CBF) during hemorrhage. METHODS: Cortical and subcortical CBF were continuously measured during blood loss (≤50%) and subsequent reperfusion using laser Doppler flowmetry. Blood gases, mean arterial blood pressure (MABP), heart rate and renal blood flow were also monitored...
May 11, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28490201/a-comparison-of-haemodynamics-between-subcranial-intracranial-bypass-and-the-traditional-extracranial-intracranial-bypass
#7
Zaitao Yu, Yang Yang, Xiang'en Shi, Hai Qian, Fangjun Liu
BACKGROUND: Ischemic cerebrovascular diseases are traditionally treated using an extracranial-intracranial (EC-IC) bypass. The use of the internal maxillary artery (IMA) in the subcranial-intracranial (SC-IC) bypass was recently described as an alternative treatment. However, the haemodynamics of this new approach have not been defined. METHODS: The haemodynamic parameters (flow volume [FV], internal diameter [ID], time-averaged mean velocity [TAM], pulsatility index [PI] and resistance index [RI]) of the IMA-radial artery graft (RAG)-middle cerebral artery (MCA) (n = 12) bypass and superficial temporal artery (STA)-MCA bypass (n = 18) were measured using intraoperative duplex ultrasonography and compared...
May 11, 2017: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/28488965/mild-to-moderate-foeto-maternal-haemorrhage-in-the-third-trimester-and-at-term-of-pregnancy-quantitative-determination-and-clinical-diagnostic-evaluation
#8
Fausta Beneventi, Chiara Cavagnoli, Elena Locatelli, Silvia Bariselli, Margherita Simonetta, Gianluca Viarengo, Cesare Perotti, Arsenio Spinillo
BACKGROUND: Foeto-maternal haemorrhage (FMH), a gestational event that occurs before or during delivery, consists of a loss of foetal blood into the maternal circulation. FMH occurs more frequently during the third trimester or labour both in normal and complicated pregnancies. In the case of alloimmunisation, the maternal immunological response and the severity of the resulting foetal or neonatal disease depend on the amount of foetal blood that passes into the maternal circulation. The aim of this study was to determine FMH in the third trimester and at term of pregnancy and to evaluate the role of clinical and ultrasound markers in the prediction of FMH...
April 19, 2017: Blood Transfusion, Trasfusione del Sangue
https://www.readbyqxmd.com/read/28488024/glioma-grading-and-determination-of-idh-mutation-status-and-atrx-loss-by-dce-and-asl-perfusion
#9
Cornelia Brendle, Johann-Martin Hempel, Jens Schittenhelm, Marco Skardelly, Ghazaleh Tabatabai, Benjamin Bender, Ulrike Ernemann, Uwe Klose
PURPOSE: To evaluate arterial spin labeling (ASL) perfusion and dynamic contrast-enhanced (DCE) perfusion in glioma grading according to the previous WHO classification of 2007, as well as concerning isocitrate dehydrogenase (IDH) mutation status and ATRX expression as required by the new WHO 2016 brain tumor classification. METHODS: The mean values of Ktrans, Kep, Ve, and Vp by DCE perfusion, and cerebral blood flow (CBF) by ASL perfusion were assessed retrospectively in 40 patients with initial glioma diagnosis...
May 9, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/28483029/value-of-3d-pseudo-continuous-arterial-spin-labeling-magnetic-resonance-perfusion-imaging-in-evaluating-posterior-circulation-ischemia-in-the-elderly
#10
Rui Jia, Xian Xu, Xinqiu Liu, Bing Wu, Weiwei Men, Ningyu An
Objective To investigate the value of 3D pseudo-continuous arterial spin labeling (3D-pCASL) magnetic resonance perfusion technique in evaluating posterior circulation ischemia (PCI) of the elderly beyond 80 years old and to offer the evidence of PCI of the elderly for clinical diagnosis. Methods Totally 53 male subjects older than 80 years were recruited in this study,including 20 subjects with clinically diagnosed PCI and 33 normal subjects. All the subjects underwent routine brain magnetic resonance imaging and 3D-pCASL sequence on a 3...
April 20, 2017: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/28481312/carotid-artery-stenting-and-blood-brain-barrier-permeability-in-subjects-with-chronic-carotid-artery-stenosis
#11
Arkadiusz Szarmach, Grzegorz Halena, Mariusz Kaszubowski, Maciej Piskunowicz, Michal Studniarek, Piotr Lass, Edyta Szurowska, Pawel J Winklewski
Failure of the blood-brain barrier (BBB) is a critical event in the development and progression of diseases such as acute ischemic stroke, chronic ischemia or small vessels disease that affect the central nervous system. It is not known whether BBB breakdown in subjects with chronic carotid artery stenosis can be restrained with postoperative recovery of cerebral perfusion. The aim of the study was to assess the short-term effect of internal carotid artery stenting on basic perfusion parameters and permeability surface area-product (PS) in such a population...
May 8, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28480872/estimation-of-arterial-input-by-a-noninvasive-image-derived-method-in-brain-h2-15-o-pet-study-confirmation-of-arterial-location-using-mr-angiography
#12
Muhammad Muinul Islam, Tetsuya Tsujikawa, Tetsuya Mori, Yasushi Kiyono, Hidehiko Okazawa
A noninvasive method to estimate input function directly from H2(15)O brain PET data for measurement of cerebral blood flow (CBF) was proposed in this study. The image derived input function (IDIF) method extracted the time-activity curves (TAC) of the major cerebral arteries at the skull base from the dynamic PET data. The extracted primordial IDIF showed almost the same radioactivity as the arterial input function (AIF) from sampled blood at the plateau part in the later phase, but significantly lower radioactivity in the initial arterial phase compared with that of AIF-TAC...
May 8, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28479402/tight-neurovascular-coupling-in-the-spinal-cord-during-nociceptive-stimulation-in-intact-and-spinal-rats
#13
Mathieu Piché, Thierry Paquette, Hugues Leblond
Functional magnetic resonance imaging (fMRI) is based on neurovascular coupling, which allows inferring neuronal activity from hemodynamic changes. Spinal fMRI has been used to examine pain processes, although spinal neurovascular coupling has never been investigated. In addition, fluctuations in mean arterial pressure (MAP) occur during nociceptive stimulation and this may affect neurovascular coupling. The objective of this study was to examine neurovascular coupling in the rat spinal cord during nociceptive stimulation while MAP was manipulated by cervical spinal transection, which prevents nociception-related MAP increases...
May 4, 2017: Neuroscience
https://www.readbyqxmd.com/read/28474984/carbon-monoxide-inhalation-induces-headache-in-a-human-headache-model
#14
Nanna Arngrim, Henrik Winther Schytz, Josefine Britze, Mark Bitsch Vestergaard, Mikael Sander, Karsten Skovgaard Olsen, Jes Olesen, Messoud Ashina
Introduction Carbon monoxide (CO) is an endogenously produced signalling molecule that has a role in nociceptive processing and cerebral vasodilatation. We hypothesized that inhalation of CO would induce headache and vasodilation of cephalic and extracephalic arteries. Methods In a randomized, double-blind, placebo-controlled crossover design, 12 healthy volunteers were allocated to inhalation of CO (carboxyhemoglobin 22%) or placebo on two separate days. Headache was scored on a verbal rating scale from 0-10...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/28470726/measurement-of-blood-flow-velocity-in-the-middle-cerebral-artery-during-spontaneous-migraine-attacks-a-systematic-review
#15
REVIEW
Nisar A Shayestagul, Casper E Christensen, Faisal Mohammad Amin, Sait Ashina, Messoud Ashina
OBJECTIVE: To assess the evidence for blood flow velocity changes in the middle cerebral artery during and outside of spontaneous migraine attacks. METHODS: A systematic literature search on PubMed was performed and reference lists of assessed articles to identify studies on spontaneous migraine attacks that used transcranial Doppler on the middle cerebral artery with comparisons to interictal measurements were reviewed. Studies on non-spontaneous attacks and intervention studies were excluded...
May 3, 2017: Headache
https://www.readbyqxmd.com/read/28469595/apolipoprotein-e-%C3%AE%C2%B54-a-possible-risk-factor-of-intracranial-pressure-and-white-matter-perfusion-in-good-grade-aneurysmal-subarachnoid-hemorrhage-patients-at-early-stage
#16
Jian-Hua Peng, Xing-Hu Qin, Jin-Wei Pang, Yue Wu, Jin-Hu Dong, Chang-Ren Huang, Wei-Feng Wan, Xiao-Bo Yang, Xiao-Chuan Sun, Li-Gang Chen, Yong Jiang
Aneurysmal subarachnoid hemorrhage (aSAH) is a devastating and complicated disease with significant morbidity and mortality. Previous studies have shown that genetic susceptibility may play an important role in the outcome of a given individual with aSAH. This study evaluates the potential association in effects of the APOE allele on the early brain injury (EBI) in light of elevated intracranial pressure (ICP) and cerebral perfusion disorders in a consecutive series of non-comatose Chinese patients with aSAH...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28465268/intracranial-blood-flow-changes-in-patients-with-high-grade-severe-carotid-artery-stenosis-after-stenting
#17
Lei Huang, Wenjie Cao, Liang Ge, Gang Lu, Xiaolong Zhang, Daoying Geng
OBJECTIVE: We investigated whether the cerebral hemodynamic changes of pre- and poststenting in patients with severe carotid stenosis differ by stenosis grades. MATERIALS AND METHODS: We prospectively recruited patients who underwent carotid artery stenting (CAS) after acute ischemic stroke from June 2014 to December 2015. We compared the mean relative cerebral blood flow changes (rCBF) (measured by whole-brain computed tomography [CT] perfusion) pre- and poststenting in patients with high-grade severe stenosis (HGSS 90%-99%) versus patients with low-grade severe stenosis (LGSS 70%-89%)...
April 29, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28461780/assessment-of-pre-and-post-operative-cerebral-perfusion-in-anterior-circulation-intracranial-aneurysm-clipping-patients-at-hospital-sungai-buloh-using-ct-perfusion-scan-and-correlations-to-fisher-navarro-and-wfns-scores
#18
Ailani Ab Ghani, Saiful Azli Mat Nayan, Regunath Kandasamy, Abdul Rahman Izani Ghani, Azmin Kass Rosman
BACKGROUND: Intracranial aneurysms may rupture and are typically associated with high morbidity and mortality, commonly due to vasospasm after rupture. Once the aneurysm ruptures, the patient's cerebral blood flow may be disturbed during the acute phase, affecting cerebral circulation and thus cerebral perfusion prior to the onset of vasospasm. Fisher and Navarro scores are used to predict vasospasm, while World Federation of Neurosurgical Societies (WFNS) scores are used to predict patient outcomes...
February 2017: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/28458103/changes-in-the-interictal-and-early-postictal-diffusion-and-perfusion-magnetic-resonance-parameters-in-familial-spontaneous-epileptic-cats
#19
Yuji Hamamoto, Daisuke Hasegawa, Shunta Mizoguchi, Yoshihiko Yu, Masae Wada, Takayuki Kuwabara, Aki Fujiwara-Igarashi, Michio Fujita
OBJECTIVE: The familial spontaneous epileptic cat (FSEC) is thought to be a good genetic model of mesial temporal lobe epilepsy. In the current study, cerebral diffusion and perfusion magnetic resonance imaging (MRI) were used to confirm the functional deficit zone in the FSEC and evaluate the effect of a single seizure on different brain regions. METHODS: Six FSECs and six healthy control cats were used in this study. MRI was performed in the interictal state (resting state for control) and postictal state immediately after the vestibular stimulation-induced generalized epileptic seizure (control cats received the same stimulation as the FSECs)...
April 23, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28457859/clinical-and-radiological-assessment-of-cerebral-hemodynamics-after-cranioplasty-for-decompressive-craniectomy-a-clinical-study
#20
Perikal J Parichay, Kiran Khanapure, Krishna C Joshi, T J Aniruddha, M Sandhya, A S Hegde
OBJECTIVES: To find the correlation between radiologically proven improvement in cerebral hemodynamics with clinical improvement in patients undergoing cranioplasty. MATERIAL AND METHODS: The study is a prospective observational study of 10 cases, in M S Ramaiah Institute of Neurosciences, involving patients treated by a decompressive craniectomy for intractable intra cranial hypertension either due to trauma or stroke and afterwards underwent cranioplasty. RESULTS: Of the 10 patients, 70% patients showing significant improvement in motor functions on Barthel index scale, 60% patients showed improvement in speech, mean duration from date of decompressive craniectomy to cranioplasty being 122...
April 27, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
keyword
keyword
64096
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"