Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Laser Doppler Flowmetry"”.
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Intra-operative optical monitoring of bowel tissue viability based on photoplethysmography and laser doppler flowmetry
… study was to combine the established techniques, laser Doppler flowmetry (LDF) and Photoplethysmography (PPG), into one probe intended for assessment of perfusion in abdominal tissue during bowel resection intraoperatively. In PPG, changes in transmission of light through tissue due to pulsation …
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The development of biomedical instrumentation using backscattered laser light
… in the microcirculation using the techniques of laser Doppler flowmetry and pulse oximetry. An investigation of the responses of Doppler flowmeters using different signal processing bandwidths and laser sources revealed two major findings. Firstly, that careful choice of processing bandwidth is …
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Dietary nitrate supplementation augments nitric oxide synthase-dependent and independent reflex cutaneous vasodilation in healthy humans
… to 43°C. Skin blood flow was measured via laser-Doppler flowmetry and mean arterial pressure determined; cutaneous vascular conductance (CVC) was calculated and expressed as %CVCmax. Subjects underwent heat stress pre- and post-nitrate supplementation (3 days of BRJ: 5mM, 0.45g nitrates per …
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Oscillations in microvascular flow : their relationship to tissue oxygenation, cellular metabolic function and their diagnostic potential for detecting skin melanoma - clinical, experimental and theoretical investigations
… information on humans. Here, data recorded using laser Doppler flowmetry (LDF) in malignant melanoma and control lesions are analysed using techniques designed for application to non-stationary, time-varying data. Many studies utilising LDF have previously revealed increased blood flow in …
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The Contribution of Nitric Oxide to the Skin Blood Flow Response to Exercise in Boys and Men
… boys (9.71.2 y) and 12 men (22.22.0 y) using laser-Doppler flowmetry and L-NAME to inhibit nitric oxide (NO). The exercise-induced SkBF increase was greater in boys versus men (p=0.03). L-NAME blunted SkBF response during exercise in boys and men (p<0.01) (758±201 to 429±229 percent change …
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Quantifying the Relationship of Bilateral Blood Flow in Glabrous Skin at Rest and During Sympathetic Perturbations
… was measured from both middle fingers via laser Doppler flowmetry, while at rest in a thermoneutral room for 20 minutes and in response to 4 randomized sympathetic perturbations (2 breath holds and 2 cold stimuli) while centrally vasodilated via heating of the back. Correlation coefficients …
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Novel Multifunctional Laser Diagnostics
… seeking to advance the state-of-the-art in laser based, multi-functional, non-invasive diagnostic systems. The results of the work have contributed to the development of methodological generic approaches to the development of devices using light to detect and analyse biomarkers relevant to …
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Akutmonitoring bei Lappenplastiken mittels Laser-Doppler-Flussmessung in Kombination mit einem Lagewechseltest
With the help of Laser Doppler flowmetry (LDF), fifteen patients with skin grafting on different skin areas were tested with the transposition test for post-operative vitality control and for observation of microcirculatory changes depending on position. The instrument used was a LDF-monitor DRT4 …
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Determining whether plasma levels of KATP channels are related to vascular function
… was assessed using (i) iontophoresis with laser Doppler flowmetry (LDF); (ii) post-occlusive reactive hyperaemia test (PORH) in the skin microvessels; (iii) pulse wave analysis (PWA) for arterial stiffness and (iv) flow-mediated dilation (FMD) in the macrovessels. <br/><br/>Results: This …
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Effects of Mild Blast Traumatic Brain Injury on Cerebral Vascular Function, Histopathological and Behavioral Outcomes in Rats
… pressure (MAP), relative cerebral perfusion (laser Doppler flowmetry, LDF) and cerebral vascular resistance (CVR) were monitored for two hours post-blast in a second study. To assess the effects of bTBI on neuronal injury, numbers of FluoroJade-C (FJC) positive cells were counted in brain …
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Negative Pressure Wound Therapy - Mechanisms of Action and Protecting Exposed Blood Vessels in the Wound Bed
… blood flow was studied with transcutaneous laser Doppler flowmetry (LDF), invasive LDF, and thermodiffusion. Femoral artery blood flow was studied with invasive LDF. Pressure in the wound edge tissue, in the wound cavity and periarterial pressure was measured with pressure transducers. Wound …
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Evaluating local skin heating as an early detection method for small-fiber neuropathy in women with breast cancer receiving paclitaxel (Taxol®)
… protocol. Axon reflexes were measured using laser Doppler Flowmetry. Axon flares were measured using full-field laser perfusion imaging. TIPN was measured using the 5-item Short Form of the Total Neuropathy Score (Reduced Version). Results identified potential signs of small-fiber TIPN in BCS …
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Adenosine receptors in cutaneous thermal hyperemia and active vasodilation in humans
… 1°C/10 s and skin blood flow was monitored via laser-Doppler flowmetry (LDF). The data obtained from these experiments suggest A[subscript]1/A[subscript]2 adenosine receptor activation directly contributes to cutaneous thermal hyperemia. These data further suggest a portion of the NO response …
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Nonlinear Dynamics of Microcirculation and Energy Metabolism for the Prediction of Cardiovascular Risk
… system and can be examined non-invasively by laser methods to assess early cardiovascular disease (CVD) risk factors, i.e. oxidative stress and endothelial dysfunction. Examples of methods used for this task are the laser Doppler flowmetry (LDF) and laser fluorescence spectroscopy (LFS), which …
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Peripheral blood flow changes in response to post-exercise cold water immersion
… 70 W). Measurement of blood flow in thigh skin (laser Doppler flowmetry), vastus lateralis muscle (near infrared spectroscopy), and common femoral artery (Doppler ultrasound), heart rate, mean arterial pressure, skin, muscle, rectal, and mean body temperatures were obtained prior to exercise and …
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Infrared thermography (IRT) for the assessment of microvascular skin blood flow in a specialist connective tissue disease unit
… was developed incorporating photography, IRT and laser Doppler flowmetry (LDF) for LS assessment, and the normal range of temperature and LD blood flow across several body sites was established in adults and children. The utility of the protocol for assessing LS activity in children was …
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Effects of external and internal precooling on sudo- and vasomotor responses and adaptations to heat acclimation
… hygrometry. Using near-infrared spectroscopy and laser Doppler flowmetry, changes in muscle blood volume and oxygenation and skin perfusion were examined. In study 4, 20 male recreational triathletes and cyclists (27-50 y) completed 10 sessions of 60-min cycling at RPE 15 within 14 days in the …
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Effects of Tea on Peripheral and Cerebral Micro- and Macrovascular Function in Humans
… at four sites on the dominant forearm using laser Doppler flowmetry (LDF). The following heating protocols were adopted: 1. Rapid 39°C (0.5°C/5-s), 2. Rapid 42°C (0.5°C/5-s) 3. Gradual 42°C (0.5°C/2-min 30-s) and 4. Slow 42°C (0.5°C/5-min). The coefficient of variation (CV) was calculated for …