PubMed Journals Articles About "Effect Of Alphagan On Retinal Blood Flow Autoregulation And Motion Detection In Patients With Normal Pressure Glaucoma" RSS

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Effect Of Alphagan On Retinal Blood Flow Autoregulation And Motion Detection In Patients With Normal Pressure Glaucoma PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Effect Of Alphagan On Retinal Blood Flow Autoregulation And Motion Detection In Patients With Normal Pressure Glaucoma articles that have been published worldwide.

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Showing "Effect Alphagan Retinal Blood Flow Autoregulation Motion Detection" PubMed Articles 1–25 of 38,000+

Neonatal cerebrovascular autoregulation.

Cerebrovascular pressure autoregulation is the physiologic mechanism that holds cerebral blood flow (CBF) relatively constant across changes in cerebral perfusion pressure (CPP). Cerebral vasoreactivity refers to the vasoconstriction and vasodilation that occur during fluctuations in arterial blood pressure (ABP) to maintain autoregulation. These are vital protective mechanisms of the brain. Impairments in pressure autoregulation increase the risk of brain injury and persistent neurologic disability. Autore...

Going with the flow: contextual fine-tuning of vascular reactivity.

Autoregulation is the ability of a system to adjust its response to a particular stimulus. It is well established that autoregulation of blood flow is specifically important to maintain proper tissue perfusion despite changes in arterial perfusion pressure. This article is protected by copyright. All rights reserved.

Cerebral blood flow velocity and autoregulation in paediatric patients following a global hypoxic-ischaemic insult.

To describe the cerebral blood flow velocity pattern and investigate cerebral autoregulation using transcranial Doppler ultrasonography (TCD) following a global hypoxic-ischaemic (HI) event in children.

Optic nerve head blood flow regulation during changes in arterial blood pressure in patients with primary open-angle glaucoma.

Abnormal autoregulation of optic nerve head blood flow (ONHBF) has been postulated to play an important role in primary open-angle glaucoma (POAG). We used laser Doppler flowmetry (LDF) to estimate quantitatively the ONHBF and compared ONHBF autoregulation between glaucoma patients and healthy controls during isometric exercise.

Structural, functional and blood perfusion changes in the rat retina associated with elevated intraocular pressure, measured simultaneously with a combined OCT+ERG system.

Acute elevation of intraocular pressure (IOP) to ischemic and non-ischemic levels can cause temporary or permanent changes in the retinal morphology, function and blood flow/blood perfusion. Previously, such changes in the retina were assessed separately with different methods in clinical studies and animal models. In this study, we used a combined OCT+ ERG system in combination with Doppler OCT and OCT angiography (OCTA) imaging protocols, in order to evaluate simultaneously and correlate changes in the re...

Establishment of an abnormal vascular patterning model in the mouse retina.

Abnormalities in retinal blood vessels and neuronal function persist in eyes undergoing retinopathy of prematurity. In this study, we examined morphological and functional changes in retinal blood vessels and neurons in mice that had undergone short-term interruption of retinal vascular development through inhibition of vascular endothelial growth factor (VEGF) signaling. In mice treated with the VEGF receptor tyrosine kinase inhibitor KRN633 on postnatal day (P) 0 and 1, the vascular density in the retinal...

Changes in Retinal Vascular Caliber after Intravitreal Aflibercept Treatment for Diabetic Macular Oedema.

Diabetic retinopathy is characterised by impaired retinal vascular autoregulation with signs of early retinal hyperperfusion and subsequent capillary drop out and peripheral ischemia. Initial retinal vascular dilation indicates disease progression and subsequent constriction signals a proliferative state. In this pilot study, we examined the effect of intravitreal aflibercept on retinal vessel diameter in patients with diabetic macular oedema.

Color Doppler Flow Imaging of Retrobulbar Ocular Blood Flow Changes in Retinal Artery Occlusions Caused by Cosmetic Facial Filler Injections.

This study aimed to evaluate the effects of retinal artery occlusions caused by cosmetic facial filler injections on the retrobulbar blood flow parameters.

A preference for visual speed during smooth pursuit eye movement.

Does the preference for visual speed extend to motion perception when the eye moves? Current evidence from psychophysics and neuroscience is limited to small patches of image motion and stationary fixation. Active observers, however, are more likely to use large patches of retinal flow and extraretinal signals accompanying eye movement to judge motion. We therefore investigated whether speed remains a primary dimension during smooth pursuit using a "discrimination-contour" technique. Our results showed that...

Directional sensitivity of dynamic cerebral autoregulation in squat-stand maneuvers.

Dynamic cerebral autoregulation (CA), the transient response of cerebral blood flow (CBF) to rapid changes in arterial blood pressure (BP), is usually modelled as a linear mechanism. We tested the hypothesis that dynamic CA can display non-linear behavior resulting from differential efficiency dependent on the direction of BP changes. CBF velocity (CBV, transcranial Doppler), heart rate (HR, 3-lead ECG), continuous BP (Finometer) and end-tidal CO (capnograph) were measured in 10 healthy young subjects durin...

Pattern visual evoked potentials and their relation to the peripapillary and retrobulbar blood flow in glaucoma.

To examine the relationship between the development of bioelectric response of retinal cell elements to pattern stimulus and the ocular blood flow.

Cerebral Small Vessel, But Not Large Vessel Disease, Is Associated With Impaired Cerebral Autoregulation During Cardiopulmonary Bypass: A Retrospective Cohort Study.

Impaired cerebral blood flow (CBF) autoregulation during cardiopulmonary bypass (CPB) is associated with stroke and other adverse outcomes. Large and small arterial stenosis is prevalent in patients undergoing cardiac surgery. We hypothesize that large and/or small vessel cerebral arterial disease is associated with impaired cerebral autoregulation during CPB.

Relations Among Foveal Blood Flow, Retinal-Choroidal Structure, and Visual Function in Retinitis Pigmentosa.

To investigate the relationships between foveal blood flow as measured by laser speckle flowgraphy (LSFG), the retinal-choroidal structure in enhanced depth imaging-optical coherence tomography (EDI-OCT), and central visual function in patients with retinitis pigmentosa (RP).

Intravital molecular tagging velocimetry of cerebral blood flow using Evans Blue.

The effects of light-driven enhancement of Evans Blue dye complexes with blood plasma proteins were observed for the first time, both in vitro and in vivo. The possible background of the effect concerns the photochemical cis-trans isomerization of the azo dye molecules. The effect was induced in the solution with a red laser with a wavelength of 638 nm, which corresponds to the peak of the dye absorption. The lifetime of the enhanced fluorescence is approximately 1 s and enables its use as an optically tagg...

Real-motion signals in human early visual cortex.

Eye movements induce visual motion that can complicate the stable perception of the world. The visual system compensates for such self-induced visual motion by integrating visual input with efference copies of eye movement commands. This mechanism is central as it does not only support perceptual stability but also mediates reliable perception of world-centered objective motion. In humans, it remains elusive whether visual motion responses in early retinotopic cortex are driven by objective motion or by ret...

Effect of pulsatility on markers of vascular damage in patients with implanted continuous flow mechanical circulatory support.

Ventricular assist devices are an important therapeutic modality in advanced surgical therapy of end-stage heart failure. Previously most frequently used devices generated mainly non-pulsatile blood flow. Despite indisputable clinical success of this therapy, we encounter complications specific to the devices generating continuous flow. Complications are mainly attributed to changes in shear stress and subsequent changes of the blood vessel characteristics, mainly of endothelium. Effect of continuous flow o...

4D-Flow MRI: Technique and Applications.

 Blood flow through the cavities of the heart and great vessels is pulsatile and is subject to time and multidirectional variations. To date, the recording of blood flow in multiple directions and phases has been limited. 4D-flow MRI offers advantages for the recording, visualization and analysis of blood flow.

Fast and robust standard-deviation-based method for bulk motion compensation in phase-based functional OCT.

Phase-based optical coherence tomography (OCT), such as OCT angiography (OCTA) and Doppler OCT, is sensitive to the confounding phase shift introduced by subject bulk motion. Traditional bulk motion compensation methods are limited by their accuracy and computing cost-effectiveness. In this Letter, to the best of our knowledge, we present a novel bulk motion compensation method for phase-based functional OCT. Bulk motion associated phase shift can be directly derived by solving its equation using a standard...

Early Detection of Diabetic Retinopathy.

Diabetic retinopathy (DR) is a primary cause of visual impairment worldwide. Diabetes mellitus may be associated with ophthalmoscopically nonvisible neurovascular damage that progresses before the first clinical signs of DR appear. Reduction of the inner neuroretinal layer thickness on macular optical coherence tomography (OCT), reduced contrast sensitivity primarily at low spatial frequencies, abnormal results in color vision and microperimetry tests, and a prolonged implicit time recorded by multifocal el...

Regular walking breaks prevent the decline in cerebral blood flow associated with prolonged sitting.

Decreased cerebrovascular blood flow and function are associated with lower cognitive functioning and increased risk of neurodegenerative diseases. Prolonged sitting impairs peripheral blood flow and function, but its effects on the cerebrovasculature are unknown. This study explored the effect of uninterrupted sitting and breaking up sitting time on cerebrovascular blood flow and function of healthy desk workers. Fifteen participants (10 male, 35.8{plus minus}10.2 years, BMI: 25.5{plus minus}3.2 kg∙m) co...

Effect of Compression Waveform and Resuscitation Duration on Blood Flow and Pressure in Swine: One Waveform does not Optimally Serve.

Chest compression (CC) research primarily focuses on finding the 'optimum' compression waveform using a variety of compression efficacy metrics. Blood flow is rarely measured systematically with high fidelity. Using a programmable mechanical chest compression device, we studied the effect of inter-compression pauses in a swine model of cardiac arrest, testing the hypothesis that a single 'optimal' CC waveform exists based on measurements of resulting blood flow.

All-optical photoacoustic Doppler transverse blood flow imaging.

The method of measuring blood flow in photoacoustic microscopy usually relies on ultrasonic transducers in contact fashion, which is not favored in many applications, such as wound areas, burns, and anabrosis. Here we present a noncontact photoacoustic velocity measurement method to quantitatively map transverse blood flow based on the photoacoustic Doppler (PAD) bandwidth broadening method with an all-optical photoacoustic microscopy system. It is validated that the PAD bandwidth broadening is proportional...

Blood Hammer Phenomenon in Human Aorta: Theory and Modeling.

This paper contains the results of computing of a blood pressure and a flow speed in a human aorta in a diastolic phase of a heart cycle. The model is based on the one-dimensional flow approach. The blood hammer effect means abrupt increasing of pressure in a blood vessels due to the sharp changes in flow speed. The closing of aortic valve at the proto-diastole phase causes such blood hammer. We consider an aorta as a simple cylindrical conduit with elastic walls. The aortic valve and the bifurcation were l...

Quantitative Ultrasound Measurements of Blood Flow Velocity and Turbulence.

The paper described the hemodynamics of blood flow based on fluid mechanics and its corresponding formulas, and revealed the limitation of blood flow velocity measurement for non-laminar flow when using the conventional pulse wave Doppler. The paper demonstrated the calculation of turbulence for blood flow based on velocity directions and quantified the turbulence according to the presented formulas. Two methods were introduced and the simulated results were analyzed. An example using real data based on ult...

Effects of Pulsatile Blood Flow on Oxygenator Performance.

Extracorporeal membrane oxygenation (ECMO) is mainly used for the therapy of acute respiratory distress syndrome and chronic obstructive lung disease. In the last years, the development of these systems underwent huge steps in optimization, but there are still problems with thrombus formation, clogging, and thus insufficient gas exchange. One idea of ECMO optimization is a pulsatile blood flow through the oxygenator, but this is still a controversy discussion. Analyzing available publications, it was not po...

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