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Cerebrovascular Circulation

Cerebrovascular Circulation refers to the blood flow and vascular dynamics within the brain and surrounding structures.
This encompasses the complex network of arteries, veins, and capillaries that supply oxygenated blood and remove deoxygenated blood from the cerebral tissue.
Proper cerebrovascular circulation is critical for neuronal function and overall brain health.
Studying this physiological process can provide valuable insights into the pathogenesis and treatment of conditions like stroke, vascular dementia, and other neurological disorders.
Researcheers can leverage innovative AI-driven tools like PubCompare.ai to optimize their cerebrovascular circulation studies, easily locating relevant protocols and leveraging advanced comparisons to identify the best approaches.
This can enhance reproducibility, accuracy, and the overall impact of this important area of biomedical research.

Most cited protocols related to «Cerebrovascular Circulation»

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Publication 2013
Cardiac Arrest Cerebrovascular Circulation Hemodynamics Neoplasm Metastasis physiology
MR experiments (3 Tesla, Siemens Medical Solutions, Erlangen, Germany) were performed on a total of 39 healthy subjects (age 31±7 years, range 19–48 years, 23 males and 16 females). The protocol was approved by Institutional Review Board. Informed written consent was obtained for each participant. The body coil was used for RF transmission and a head coil was used for receiving. Foam paddings were used to stabilize the head to minimize motion. The subjects were instructed not to fall asleep during the experiments (verified after the session), as the cerebral blood flow and venous oxygenation may change during sleep. Four effective TEs were used: 0ms, 40ms, 80ms and 160ms, corresponding to 0, 4, 8 and 16 refocusing pulses in the T2-preparation (τCPMG=10ms). Other Imaging parameters: FOV=230mm, matrix=64×64, single-shot EPI, slice thickness=5mm, TR=8000ms, TE=19ms, TI=1200ms, repetition=4, thickness of labeling slab = 50 mm, gap between labeling slab and imaging slice = 25 mm, scan duration 4 minutes and 16 seconds.
In a sub-group of healthy subjects (n=6), the intra-session reproducibility was evaluated by performing five TRUST MRI scans at approximately 10 minute intervals. The same slice locations and imaging parameters were used for the five scans.
In a sub-group of healthy subjects (n=5), TR dependence of the measurement was investigated by performing TRUST MRI using TR values of 1.5 seconds to 8 seconds at 0.5 second intervals (14 different TR values). All other parameters were identical as specified above. The durations for the scans depended on TR and varied from 48 seconds to 4 minutes and 16 seconds. In one subject, the TI dependence was investigated (with fixed TR) and the TI values varied from 200ms to 2600ms (13 different TI values). All other parameters were identical as specified above.
In two healthy subjects, hypercapnia challenge (by breathing through a plastic tube with 600ml of volume, thereby increasing the dead-space (25 (link))) was induced and TRUST MRI was performed before, during, and after the challenge. End-tidal CO2 (EtCO2) was monitored throughout the experiment and was compared to MRI results.
In three healthy subjects, TRUST MRI was performed before and after 200mg caffeine tablet ingestion (26 (link)). The pre-caffeine scan was first performed. Then, while still inside the head coil, the subject was instructed to open his or her mouth for the researcher to place one tablet inside, and a small amount of water was administered via a straw to assist with swallowing. The MRI table was then repositioned to the iso-center. Twenty minutes later, the post-caffeine TRUST scan was performed. During the twenty minute waiting time, other anatomical scans (e.g. T1-weigthed anatomical imaging) were performed.
In three subjects, TRUST MRI was performed before and after the intravenous administration of Gd-DTPA contrast agent (Magnevist, Berlex Laboratories, Wayne, NY) at standard dosage (0.1 mmol/kg). The post-contrast TRUST was performed approximately 6 minutes after the injection of the contrast agent so that the agent concentration remained relatively constant for the duration of the TRUST scan.
Publication 2008
Caffeine Cell Respiration Cerebrovascular Circulation Contrast Media Ethics Committees, Research Females Gadolinium DTPA Head Healthy Volunteers Human Body Intravenous Infusion Magnevist Males MRI Scans Neoplasm Metastasis Oral Cavity Pulses Radionuclide Imaging Sleep Tablet Transmission, Communicable Disease Veins
The candidates for this study were patients with suspected iNPH. After obtaining written informed consent, the eligible patients were pre-registered and received lumbar puncture. The inclusion criteria were (1) age between 60 and 85 years, (2) presence of one or more symptom(s) of the triad (gait disturbance, cognitive impairment, and urinary symptoms), which were measurable on the iNPH Grading Scale (iNPHGS) [14 (link)], (3) MRI features of iNPH, i.e., both ventriculomegaly of Evans' index > 0.3 and tight high-convexity and medial subarachnoid spaces on coronal T1-weighted MRI (Figure 1) [10 (link)], (4) absence of known disorders causing ventriculomegaly, and (5) normal cerebrospinal fluid (CSF) content (protein ≤ 50 mg/dl and cell count ≤ 3 μm3) and pressure (≤ 20 cmH2O). Exclusion criteria were (1) presence of musculoskeletal, cardiopulmonary, renal, hepatic, or mental disorders that would make it difficult to evaluate changes of symptoms, (2) obstacles to one-year follow-up, and (3) hemorrhagic diathesis or anticoagulant medication. For the evaluation of the MRIs, Evans' index, size of the Sylvian fissures rated according to the protocol of Kitagaki et al. [10 (link)], presence or absence of focal dilatation of the cerebral sulci, and white-matter changes according to scale of Fazekas et al. [15 (link)], were assessed on each site and recorded.
The candidates were pre-registered before CSF examination via a web-based case report system. MRI was reviewed by each site in the pre-registration phase, and the final eligibility of the subjects was judged by the central MRI review committee, which consist of neurosurgeons, neurologists, and a neuroradiologist. The central MRI review committee excluded those whose MRI did not fulfil the inclusion criteria. After the confirmation of normal CSF content and pressure, the investigator was notified of registration via the web system. Tap test was carried out in all subjects with 30 ml CSF removal via lumbar puncture. CT cisternography was carried out 1 week after the tap test with iohexol (Omnipaque®: 180 mg/ml) 30 mg/kg. Cerebral blood flow was measured using 123I-Iodoamphetamine and single photon emission computed tomography at baseline. However, the results of these measures were not considered for the eligibility.
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Publication 2010
Anticoagulants Cerebrospinal Fluid Cerebrovascular Circulation Dilatation Disorders, Cognitive Eligibility Determination Hemorrhagic Disorders Iodine-123 Iohexol Kidney Mental Disorders Neurologists Neurosurgeon Omnipaque Patients Pressure Proteins Punctures, Lumbar Subarachnoid Space Tomography, Emission-Computed, Single-Photon Triad resin Urine White Matter
Eligible participants included men and women, ages 18 to 65 years. Subjects with MDD had been diagnosed with recurrent MDD without psychotic features using the Structured Clinical Interview for Axis I DSM-IV Disorders (SCID)-Patient Version (40 ). Subjects were required to have a score ≥20 on the Montgomery-Åsberg Depression Rating Scale (MADRS) at screening and before each infusion. Subjects had to have not responded to at least one adequate antidepressant trial during their current episode, as assessed using the Antidepressant Treatment History Form (41 ), and the current episode had to have lasted at least four weeks. Subjects were free from psychotropic medications in the two weeks before randomization (five weeks for fluoxetine, three weeks for aripiprazole). A patient sample size of 34 individuals was necessary to have 80% power to detect an antidepressant effect of ketamine (d=0.5) with p<0.05, two-tailed.
Healthy control subjects consisted of males and females, 18–65 years old with no Axis I disorder as determined by SCID-NP, and no family history of Axis I disorders in first degree relatives. Healthy control subjects were free of medications affecting neuronal function or cerebral blood flow or metabolism. Subjects in both groups were in good physical health as determined by medical history, physical exam, blood labs, electrocardiogram, chest x-ray, urinalysis, and toxicology. The study was approved by the National Institutes of Health (NIH) Combined Neuroscience Institutional Review Board. All subjects provided written informed consent before entry into the study (NCT00088699).
Publication 2017
Antidepressive Agents Aripiprazole BLOOD Cerebrovascular Circulation Electrocardiography Epistropheus Ethics Committees, Research Females Fluoxetine Healthy Volunteers Ketamine Males Mental Disorders Metabolism Neurons Patients Pharmaceutical Preparations Physical Examination Psychotropic Drugs Radiography, Thoracic SCID Mice Urinalysis Woman
Cerebral ischemia was induced by 90 min of reversible MCAO under isoflurane anesthesia, as described previously [26 (link), 32 (link), 56 (link)]. In brief, a midline ventral neck incision was made, and unilateral right MCAO was performed by advancing a 6.0 silicone-coated nylon monofilament (Doccol Corporation, CA) into the internal carotid artery 6 mm from the internal carotid–pterygopalatine artery bifurcation via an external carotid artery stump. Rectal temperatures were monitored with a temperature control system (Fine science tools, Canada) and temperature was maintained with an automatic heating pad at ~37 °C during surgery and ischemia. Cerebral blood flow measurements by laser Doppler flowmetry (DRT 4/Moor Instruments Ltd, Devon, UK) confirmed ischemic occlusion (reduction to 85 % of baseline) during MCAO and restoration of blood flow during reperfusion. Surgical controls are used for molecular analysis, a sham surgery in which the suture was not advanced into the internal carotid artery (controls). All mice are allowed to emerge from anesthesia after the initial suture advancement into the MCA and placed back into their home cage until re-anesthetized for reperfusion. This allows for the assessment of intra-ischemic behavioral deficits to confirm successful suture placement.
Publication 2012
Amputation Stumps Anesthesia Blood Circulation Cerebral Ischemia Cerebrovascular Circulation Dental Occlusion External Carotid Arteries Internal Carotid Arteries Ischemia Isoflurane Laser-Doppler Flowmetry Mus Neck Nylons Operative Surgical Procedures Rectum Reperfusion Silicones Sutures

Most recents protocols related to «Cerebrovascular Circulation»

The ischaemic area (cerebral blood flow <30% of the normal value and Tmax >6 s) was automatically measured using F-STROKE perfusion software. As the obtained examination data were transferred to a dedicated workstation (spectral diagnostic suite [SPD]; Philips Healthcare), effective atomic number (Zeff) maps, iodine density maps, and iodine–no-water maps were obtained in real time in a post-processing workstation.
The Zeff characterizes the measured attenuation energy sensitivity of an unknown compound in terms of a resultant atomic number, which was estimated by the monochromatic attenuation ratio method since the monochromatic attenuation ratio is a monotonic as a function of effective atomic number (17 (link), 18 (link)).
First, the brain perfusion defect area was identified according to the color difference on the fusion map of the iodine density map and effective atomic number. Then, referring to the results of F-STROKE software, the largest layer of the abnormal perfusion area was selected, and the ROI of the perfusion defect area and contralateral mirror brain area was manually drawn. We selected the core infarct area as the ROI and measured it manually three times to get the average value (Figures 24). The selection of ROI should avoid blood vessels and calcification as much as possible and then switch to the effective atomic number map, iodine density map and anhydrous iodine map. We measured and recorded the values of the spectroscopic quantitative parameters (effective atomic number [Zeff value], iodine identity value, and iodine-no water value) in the ischaemic area and comparative normal area. All measurements were performed independently by 2 radiologists who had more than 6 years of experience in neural imaging diagnosis. They were blinded to the spectral data measurements on the corresponding values of the spectroscopic quantitative parameters.
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Publication 2023
Blood Vessel Brain Cerebrovascular Accident Cerebrovascular Circulation Diagnosis Hypersensitivity Infarction Iodine Microtubule-Associated Proteins Nervousness Perfusion Physiologic Calcification Radiologist Spectrum Analysis
Baseline CT imaging included brain non-contrast CT, CTP, and CTA, obtained with different CT scanners (64, 128, 256, or 320 detectors, with Toshiba [Tokyo, Japan], Siemens [Munich, Germany], or GE [Cleveland, OH, USA] scanners). The axial coverage ranged from 80 to 160 mm.
The CTP data were processed by commercial software MIStar (Apollo Medical Imaging Technology, Melbourne, Vic, Australia). CTP parameters were generated by applying the mathematical algorithm of singular value decomposition with delay and dispersion correction (20 (link), 21 (link)). The following four CTP parameters were generated: cerebral blood flow (CBF), cerebral blood volume (CBV), mean transit time (MTT), and delay time (DT). The penumbra and core volume were measured on acute CTP with dual threshold setting (22 (link)): DT at the threshold of 3 s for whole ischemic lesion volume and CBF at the threshold setting of 30% for acute core volume. The collateral index was defined by the ratio of DT >6 s/DT >2 s volume.
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Publication 2023
Brain CAT SCANNERS X RAY Cerebral Blood Volume Cerebrovascular Circulation Maritally Unattached
We analyzed CTP images from the International Stroke Perfusion Imaging Registry (INSPIRE), which is a database of acute stroke perfusion imaging and associated clinical information. For this study we used consecutive patients presenting with acute ischemic stroke who had whole brain CTP and who were recruited into INSPIRE between 2010 and 2017 at the John Hunter Hospital, Newcastle, Australia. For standardization, only one site was used at this stage. As is routine in INSPIRE, patients all underwent baseline multimodal CT imaging with non-contrast CT, CTA, and CTP. Written informed consent was obtained from all participants, and the INSPIRE study was approved by the site's ethics committee (23 (link)).
To obtain the perfusion images, a total of 19 acquisitions occurred over 60 s. The CTP data were processed by commercial software MIStar (Apollo Medical Imaging Technology, Melbourne, VIC, Australia). CTP parameters were generated by applying the mathematical algorithm of singular value decomposition with delay and dispersion correction (24 (link)). The following four CTP parameters were generated: cerebral blood flow (CBF), cerebral blood volume (CBV), mean transit time (MTT), and delay time (DT). The penumbra and core volumes were defined with dual thresholds: DT at the threshold of 3 s for total ischemic lesion volume and CBF at the threshold setting of 30% for acute core volume (8 (link), 16 (link), 25 (link)). After single-value thresholding, core/penumbra areas were limited to a single lesion and artifactual or erroneous regions were removed. The resulting map was used as the ground truth (GT). Core/penumbra were reviewed by experts to ensure they were accurate.
To develop the model, we used 86 acute ischemic stroke patients with a large vessel occlusion (LVO): M1 segment of the middle cerebral artery (MCA) or internal carotid artery (ICA). To provide additional testing and external validation, 25 patients were used, with both LVO and non-LVO occlusions. This was done to observe whether a model trained only on lesions resulting from an occlusion of large vessel will perform as well when testing on a variety of occlusion sites. Each patient in the test set underwent follow-up MR diffusion-weighted imaging (DWI) between 24 and 72 h after onset. The volume (mL) of the infarct core, as estimated by MR-DWI, was recorded and used for external validation. On follow-up imaging, all patients had a thrombolysis in cerebral infarction (TICI) score of at least 2b, indicating relatively complete reperfusion of initially hypoperfused regions. In these cases, the volume of the acute CTP core should more closely match that of the follow-up infarct core and could therefore be used to validate the predictions.
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Publication 2023
Acute Cerebrovascular Accidents Acute Ischemic Stroke Blood Vessel Brain Cerebral Blood Volume Cerebral Infarction Cerebrovascular Accident Cerebrovascular Circulation Dental Occlusion Diffusion Ethics Committees Fibrinolytic Agents Infarction Internal Carotid Arteries Middle Cerebral Artery Multimodal Imaging Patients Perfusion Reperfusion
This retrospective study was approved by Gifu University Institutional Review Board. The requirement of informed consent was waived due to the retrospective nature of the study. A series of 306 consecutive participants who underwent DTARG at our institution from January 2016 to December 2020 was included in the subsequent analysis. Overall, 12 of the 306 participants were excluded because they were under 20 years of age. The remaining 294 participants (mean age, 66 ± 15 years; age range, 20–89 years; 195 men; mean body weight, 61 ± 11 kg; body weight range, 37–106 kg) were included in this study (Fig 1). Of these 294 participants, one had normal blood flow, and 293 had abnormal blood flow in DTARG, diagnosed by one radiologist (____with 7 years of post-training experience in nuclear medicine). Furthermore, 176 participants had internal carotid artery stenosis or occlusion (right, 82; left, 54; bilateral, 40), 50 had middle cerebral artery stenosis or occlusion (right, 17; left, 30; bilateral, three), 39 participants had moyamoya disease, seven had vertebral artery stenosis or occlusion (right, three; left, two; bilateral, two), three had basilar artery stenosis, two had subclavian artery stenosis (right, one; bilateral, one), one had bilateral common carotid artery stenosis, one had dual arteriovenous fistula, and 15 participants had multiple cervical and/or intracranial arterial stenosis or occlusion. Of the 294 participants, 54 were examined after treatment for cerebral circulation.
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Publication 2023
Aftercare Arteries Basilar Artery Stenosis Blood Circulation Body Weight Cerebrovascular Circulation Common Carotid Artery Stenosis Dental Occlusion Ethics Committees, Research Fistula, Arteriovenous Internal Carotid Artery Stenosis Middle Cerebral Artery Moyamoya disease 1 Neck Radiologist Radionuclide Imaging Stenosis Subclavian Steal Syndrome Vertebral Artery Stenosis
Focal brain ischemia was induced by transient intraluminal MCAO using a monofilament. Animals were first anesthetized with 2.5% avertin (20 µl/g, i.p.). A midline ventral neck skin incision was made, the temporal muscle was retracted, and the left carotid artery was exposed and isolated. After the common carotid artery and the external carotid artery were ligated, a silicone-coated monofilament (Doccol, Sharon, MA, USA) was inserted into the left internal carotid artery through an incision in the common carotid artery until it reached the origin of the left MCA where mild resistance was encountered (9–10 mm). One hour after blocking the MCA, the monofilament was withdrawn to restore the blood flow, and the skin was sutured. Transcranial laser-Doppler flowmetry (PeriMed) was utilized to monitor the regional cerebral blood flow (CBF) and ensure successful ischemia and reperfusion. MCA occlusion was determined by a reduction of more than 70% in CBF compared to that at baseline. The body temperature of each mouse was maintained at 37 °C ± 0.5 °C with an electric blanket pad throughout the procedure. No significant differences were noted between Vdr-cKO and control mice in regional CBF at baseline, during ischemia and reperfusion (Additional file 1: Fig. S2G, H), as well as in body temperature and blood pressure during MCAO or sham procedure. Mice were returned to the cages after regaining consciousness.
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Publication 2023
Animals Blood Circulation Blood Pressure Body Temperature Brain Ischemia Cerebrovascular Circulation Common Carotid Artery Consciousness Dental Occlusion Electricity External Carotid Arteries Internal Carotid Arteries Ischemia Laser-Doppler Flowmetry Mice, House Neck Regional Cerebral Blood Flow Reperfusion Silicones Skin Temporal Muscle Transients tribromoethanol

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More about "Cerebrovascular Circulation"

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