Near infrared speAneurysmsOxygenationAneurysmAutoregulationMicrovascular cerebral blooPerfusionArteriovenous malformationsImprove cerebralAging brainSystemicCarbon dioxidePosterior cerebrVascularPretermBloodBilateralSedentaryArteriesCardiacArteryEncephalopathyImagingPatientsRespiratoryExtentArterialMonitoringRole
Near infrared spe6
- In this feasibility study, we evaluated the utility of functional near infrared spectroscopy (fNIRS) in measuring cerebral hemodynamics in the prefrontal cortex (PFC) in toddlers between 18 and 36 months of age. (nih.gov)
- Using near infrared spectroscopy to evaluate hemodynamic alteration, bilateral temporal hemodynamics considerably increased after the three-month jogging therapy. (clinical-practice-and-epidemiology-in-mental-health.com)
- We assessed the dynamic changes in CBF and peripheral and cerebral oxygenation engendered by ascent to altitude with partial acclimatization and hyperventilation using a combination of near-infrared spectroscopy, transcranial Doppler ultrasound, and diffuse correlation spectroscopy. (mainehealth.org)
- Functional near-infrared spectroscopy and transcranial doppler sonography were used to measure changes in cerebral hemodynamics during cognitive stimulation. (physionet.org)
- Non invasive monitoring of cerebral hemodynamics using near infrared spectroscopy. (spiedigitallibrary.org)
- Up-regulation of cerebral cytochrome-c-oxidase and hemodynamics by transcranial infrared laser stimulation: A broadband near-infrared spectroscopy study. (nih.gov)
Aneurysms9
- Hemodynamics and Anatomy of Elastase-Induced Rabbit Aneurysm Models: Similarity to Human Cerebral Aneurysms? (ajnr.org)
- Animal models provide a mechanism for fundamental studies of the coupling between hemodynamics and pathophysiology in diseases such as saccular aneurysms. (ajnr.org)
- Most hemodynamic and geometric features in a commonly used elastase-induced rabbit saccular aneurysm model are qualitatively and quantitatively similar to those seen in large numbers of human cerebral aneurysms. (ajnr.org)
- Computational fluid dynamics (CFD) studies provide a valuable tool for evaluating the role of hemodynamics in vascular diseases such as cerebral aneurysms and atherosclerosis. (nih.gov)
- In this work, we evaluate the influence of geometric approximations in vascular anatomy on hemodynamics in elastase induced saccular aneurysms in rabbits. (nih.gov)
- The findings in this work demonstrate the accuracy of CFD results can be compromised if insufficient neighboring vessels are included in studies of hemodynamics in elastase induced rabbit aneurysms. (nih.gov)
- Biology and hemodynamics of cerebral aneurysms. (usz.ch)
- Past statistical studies demonstrating the likelihood of slow blood flow in most ruptured aneurysms have suggested that thrombogenesis plays an important role in ruptures of cerebral artery aneurysms. (witpress.com)
- In this study, patterns of blood fl ow in three models of cerebral artery bifurcation aneurysms were numerically analysed and compared to discern the likelihood of platelet aggregation. (witpress.com)
Oxygenation11
- We first analyzed the hemodynamic activation in left and right prefrontal cortex then calculated the oxygenation variability (OV) index based on variability in oxygen saturation at frequencies attributed to cerebral autoregulation for each child. (nih.gov)
- Transcranial Doppler sonography (TCD) and transcranial cerebral oximetry (TCCO) measures of cerebral blood flow velocity and oxygenation levels were collected during an abbreviated 12-min vigilance task. (ucf.edu)
- In contrast to other experimental and clinical data, we observed no pathological findings in the investigated parameters of cerebral perfusion and oxygenation. (biomedcentral.com)
- We therefore tried to investigate simultaneously various parameters to obtain a more broad survey of cerebral perfusion and oxygenation in patients with sepsis syndrome showing abnormal EEG patterns. (biomedcentral.com)
- Cerebral hemodynamics at altitude: effects of hyperventilation and acclimatization on cerebral blood flow and oxygenation. (mainehealth.org)
- OBJECTIVE: Alterations in cerebral blood flow (CBF) and cerebral oxygenation are implicated in altitude-associated diseases. (mainehealth.org)
- METHODS: Peripheral (Spo2) and cerebral (Scto2) oxygenation, end-tidal carbon dioxide (ETCO2), and cerebral hemodynamics were studied in 12 subjects using transcranial Doppler and diffuse correlation spectroscopy (DCS) at 75 m and then 2 days and 7 days after ascending to 4559 m above sea level. (mainehealth.org)
- RESULTS: Cerebral oxygenation and peripheral oxygenation showed a divergent response, with cerebral oxygenation decreasing at day 2 and decreasing further at day 7 at altitude, whereas peripheral oxygenation decreased on day 2 before partially rebounding on day 7. (mainehealth.org)
- CONCLUSIONS: An intensification of the normal cerebral hypocapnic vasoconstrictive response occurred after partial acclimatization in the setting of divergent peripheral and cerebral oxygenation. (mainehealth.org)
- This may help explain why hyperventilation fails to improve cerebral oxygenation after partial acclimatization as it does after initial ascent. (mainehealth.org)
- Exertional Desaturation in Idiopathic Pulmonary Fibrosis: The Role of Oxygen Supplementation in Modifying Cerebral-Skeletal Muscle Oxygenation and Systemic Hemodynamics. (bvsalud.org)
Aneurysm6
- 1 - 6 As a result, a large body of research has been directed at categorizing the hemodynamics inside human IAs and correlating aneurysm growth as well as rupture with specific hemodynamic markers such as abnormally high or low magnitudes of WSS and OSI. (ajnr.org)
- The coupling between hemodynamics and aneurysm pathophysiology is complex and remains poorly understood. (ajnr.org)
- In this study, using fluid-structure interaction (FSI), 3-dimensional blood flow in an aneurysm in the circle of Willis - which is located in the middle cerebral artery (MCA) - has been simulated. (karger.com)
- A cerebral aneurysm is an abnormal dilation of a blood vessel in the brain that harbours the risk of rupturing. (tum.de)
- To decide whether an induced blood flow alteration is sufficient for aneurysm occlusion is an essential task that the treating doctor currently fulfills by visually comparing cerebral angiography sequences taken before and after flow diverter placement. (tum.de)
- A cerebral aneurysm is defined as a local outpouching of an intracranial artery and can either be saccular or fusiform. (intechopen.com)
Autoregulation3
- Additionally, cerebral blood flow velocity (Transcranial Doppler) and blood pressure (Finapres) were measured in rest, and during sit-to-stand and CO2 challenges to assess baroreflex sensitivity, cerebral autoregulation, and cerebral vasomotor reactivity. (edu.au)
- Results: No short-term differences were observed in cognitive performance, cerebral blood flow velocity, baroreflex sensitivity, cerebral autoregulation, or cerebral vasomotor reactivity across time, or between conditions. (edu.au)
- First, we employ the fast-DCS instrumentation to measure cerebral autoregulation (CVAR) dynamics. (spie.org)
Microvascular cerebral bloo1
- Four very low birth weight, very premature infants were monitored during a 12° postural elevation using diffuse correlation spectroscopy (DCS) to measure microvascular cerebral blood flow (CBF) and transcranial Doppler ultrasound (TCD) to measure macrovascular blood flow velocity in the middle cerebral artery. (wustl.edu)
Perfusion1
- Conclusions: In older individuals, three hours of sitting did not influence cognitive performance or cerebral perfusion. (edu.au)
Arteriovenous malformations1
- Complex hemodynamics in cerebral arteriovenous malformations (AVM) are thought to play a key role in their pathophysiology. (elsevierpure.com)
Improve cerebral1
- These findings highlight the importance of maintaining aerobic fitness throughout the lifespan given its capacity to improve cerebral hemodynamics in later-life. (southwales.ac.uk)
Aging brain1
- Internet Medical Journal: Cerebral hemodynamics of the aging brain: risk of Alzheimer disease and benefit of aerobic exercise. (medjournal.com)
Systemic2
- Whether alterations of systemic or cerebral circulation might play a role in sepsis-induced encephalopathy, however, has not yet been determined. (biomedcentral.com)
- Treatment is improvement of systemic hemodynamics. (msdmanuals.com)
Carbon dioxide4
- We hypothesized that cerebral haemodynamics and carbon dioxide reactivity would be impaired in patients with sepsis syndrome and pathological electroencephalogram patterns. (biomedcentral.com)
- After approval of the institutional ethics committee, 10 mechanically ventilated patients with sepsis syndrome and pathological electroencephalogram patterns underwent measurements of cerebral blood flow and jugular venous oxygen saturation before and after reduction of the arterial carbon dioxide partial pressure by 0.93 ± 0.7 kPa iu by ypervent ilation. (biomedcentral.com)
- Age-related impairments in cerebral blood flow and cerebrovascular reactivity to carbon dioxide (CVRCO2) are established risk factors for stroke that respond favorably to aerobic training. (southwales.ac.uk)
- Middle cerebral artery blood velocity (MCAv, transcranial Doppler ultrasound), mean arterial pressure (MAP, finger photoplethysmography), and end-tidal partial pressure of carbon dioxide (PETCO2, capnography) were recorded during normocapnia and 3 mins of iso-oxic hypercapnea (5% CO2).Cerebrovascular resistance/conductance indices (CVRi/CVCi) were calculated asMAP/MCAv and MCAv/MAP, respectively, and CVRCO2 as the percentage increase inMCAv from baseline per millimeter of mercury (mm Hg) increase in PETCO2. (southwales.ac.uk)
Posterior cerebr1
- The PCoA extends posteriorly to connect with the primary segment of the posterior cerebral artery (PCA), allowing collateral flow to pass between the anterior and posterior circulations. (medscape.com)
Vascular4
- The influence of the vascular domain on intra-aneurysmal hemodynamics varied between the low and high AR cases. (nih.gov)
- These data support the hypothesis that similar vascular mechanisms underlie both the peripheral and cerebral effects of flavanols. (nature.com)
- Forame oval patente e acidente vascular cerebral isquêmico em jovens: associação causal ou estatística? (scienceopen.com)
- endovascular therapy of pediatric cerebral vascular malformations, eg. (usz.ch)
Preterm1
- This method may be useful for the continuous study of cerebral haemodynamics in the preterm baby over prolonged periods. (ox.ac.uk)
Blood9
- The cerebral capillary closing pressure was determined from transcranial Doppler measurements of the arterial blood flow of the middle cerebral artery and the arterial pressure curve. (biomedcentral.com)
- Three clinical situations, in which cerebral blood flow might be expected to change, have been studied. (ox.ac.uk)
- 3D rendered photoacoustic image showing cerebral blood signal in the mouse brain. (visualsonics.com)
- This local change in hemodynamics supposedly leads to flow stasis and thrombus formation inside the aneursym, eventually cutting it off from the normal circulation of blood. (tum.de)
- Low cerebral blood flow can affect cognition in patients with high-grade asymptomatic internal carotid artery stenosis. (karger.com)
- Also it has been applied to cerebral blood flow monitoring of rats during middle cerebral artery occlusion surgery. (spie.org)
- Second, we utilized pulsatile blood flow oscillations in cerebral arteries to estimate the critical closing pressure (CrCP), i.e., the arterial blood pressure at which CBF approaches zero. (spie.org)
- Propofol is also known to decrease the cerebral blood flow and intracranial hypertension (ICH). (medscape.com)
- Mechanism is thought to be change in cerebral blood flow and pH. (msdmanuals.com)
Bilateral1
- Patients underwent bilateral insonation of middle cerebral arteries with standard 2-Hz probes over the temporal windows with transcranial Doppler. (karger.com)
Sedentary1
- The present study examined to what extent cerebra hemodynamics are improved when training is sustained throughout the adult lifespan.MethodsEighty-one healthy males were prospectively assigned to 1 of 4 groups based on their age(young, ≤30 years versus old, ≥60 years) and lifetime physical activity levels(trained, ≥150 minutes recreational aerobic activity/week versus sedentary, no activity). (southwales.ac.uk)
Arteries1
- Lateral projection of a left common carotid artery injection that displays the order of branching in the intracranial carotid, including 1: ophthalmic, 2: posterior communicating, 3: anterior choroidal, and 4: anterior cerebral arteries. (medscape.com)
Cardiac3
- The objective of this study was to compare gas exchange, cardiac and cerebral hemodynamic responses between 10 non-obese and 10 obese men during submaximal work. (datadryad.org)
- Other cardiac and cerebral responses, although increased from baseline, were similar between groups during submaximal effort. (datadryad.org)
- We report studies in which the amplitude of the cardiac-synchronous change in transcephalic impedance, ΔZ, has been used in the investigation of cerebral haemodynamics in newborn babies. (ox.ac.uk)
Artery1
- This artery arises from the common carotid artery in the neck, entering the head at skull base via the carotid canal, and terminates at the bifurcation into the anterior cerebral artery (ACA) and middle cerebral artery (MCA). (medscape.com)
Encephalopathy2
- The occurrence of cerebral edema and ICH in patients with acute liver failure is related to the severity of encephalopathy. (medscape.com)
- Cerebral edema is seldom observed in patients with grades I-II encephalopathy. (medscape.com)
Imaging1
- We applied 4D flow magnetic resonance imaging (MRI) for the detailed evaluation of AVM function at baseline and to investigate the impact of staged embolization on AVM hemodynamics in a patient with a Spetzler-Martin grade III AVM. (elsevierpure.com)
Patients7
- Most patients with sepsis develop potentially irreversible cerebral dysfunctions. (biomedcentral.com)
- It is yet not clear whether cerebral haemodynamics are altered in these sepsis patients at all, and to what extent. (biomedcentral.com)
- HERALD (Hopkins Exploration, Research, and Advancement in Life support Devices) Investigators 2023, ' Characterization of Cerebral Hemodynamics with TCD in Patients Undergoing VA-ECMO and VV-ECMO: a Prospective Observational Study ', Neurocritical care , vol. 38, no. 2, pp. 407-413. (johnshopkins.edu)
- We present the results of a study that evaluated the abnormalities of the cerebral venous outflow in patients with MS using ECD-TCCS and selective venography. (bmj.com)
- Conclusions This triple-blinded extra- and transcranial duplex sonographic assessment of cervical and cerebral veins does not provide supportive evidence for the presence of CCSVI in MS patients. (bmj.com)
- There is no information provided about changes in hemodynamics in these patients while they were receiving the infusion/bolus. (medscape.com)
- Compte tenu du nombre croissant d'infections et de décès par le virus de la grippe pandémique (H1N1) 2009 confirmés en laboratoire dans la Région OMS de la Méditerranée orientale, le Bureau régional a convoqué une réunion consultative d'experts impliqués dans la prise en charge clinique de patients infectés par ce virus. (who.int)
Respiratory1
- In contrast, MR and selective injection venography are of course limited in evaluating cerebral venous haemodynamics under different postural and respiratory conditions. (bmj.com)
Extent1
- The present study examined to what extent cerebra hemodynamics are improved when training is sustained throughout the adult lifespan. (southwales.ac.uk)
Arterial1
- It is commonly accepted that hemodynamics play a role in the initiation and further development of arterial pathologies such as IAs. (ajnr.org)
Monitoring1
- ICP monitoring helps in the early recognition of cerebral edema. (medscape.com)
Role1
- There is increasing evidence that ammonia may play a pathogenic role in the development of cerebral edema. (medscape.com)