keyword
MENU ▼
Read by QxMD icon Read
search

laser doppler

keyword
https://www.readbyqxmd.com/read/29228086/new-methods-to-study-the-microcirculation
#1
Damiano Rizzoni, Claudia Agabiti Rosei, Carolina De Ciuceis, Francesco Semeraro, Marco Rizzoni, Franco Docchio
Essential hypertension is associated with structural alterations in the microvessels; in particular, an increase in the media thickness to internal lumen ratio of small resistance arteries (MLR) and a reduction in capillary density have been observed. The evaluation of the morphological characteristics of small resistance arteries in humans is challenging. The gold standard method is generally considered to be the measurement by wire or pressure micromyography of MLR of subcutaneous small vessels obtained by local biopsies...
December 7, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/29223560/the-relationship-between-intestinal-and-oral-mucosa-microcirculation-in-anaesthetized-horses
#2
Klaus Hopster, Stephan Neudeck, Liza Wittenberg-Voges, Sabine Br Kästner
OBJECTIVE: To compare alteration in intestinal blood flow in anaesthetized horses with changes in oral mucosa blood flow. STUDY DESIGN: Prospective, randomized clinical study. ANIMALS: Eight warmblood horses. METHODS: After induction with guaifenesin and ketamine, anaesthesia was maintained with isoflurane at 1.5 vol% in oxygen. The tissue blood flow was measured using laser Doppler flowmetry at the jejunum, colon, rectal mucosa, oesophageal mucosa and the oral mucosa...
August 18, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/29221156/the-protective-role-of-sphingosine-1-phosphate-against-the-action-of-the-vascular-disrupting-agent-combretastatin-a-4-3-o-phosphate
#3
Joanna Shepherd, Matthew Fisher, Abigail Welford, Donald M McDonald, Chryso Kanthou, Gillian M Tozer
Solid tumours vary in sensitivity to the vascular disrupting agent combretastatin A-4 3-O-phosphate (CA4P), but underlying factors are poorly understood. The signaling sphingolipid, sphingosine-1-phosphate (S1P), promotes vascular barrier integrity by promoting assembly of VE-cadherin/β-catenin complexes. We tested the hypothesis that tumour pre-treatment with S1P would render tumours less susceptible to CA4P. S1P (1μM) pretreatment attenuated an increase in endothelial cell (HUVEC) monolayer permeability induced by 10μM CA4P...
November 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29221074/miniaturized-calcium-beam-optical-frequency-standard-using-fully-sealed-vacuum-tube-with-10-15-instability
#4
Haosen Shang, Xiaogang Zhang, Shengnan Zhang, Duo Pan, Haijun Chen, Jingbiao Chen
We implement a miniaturized calcium beam optical frequency standard using specially-designed fully-sealed vacuum tube, and realize the comparison with another calcium beam optical clock whose vacuum tube is sealed by flanges. The electron shelving detection method is adopted to improve the signal-to-noise ratio of the clock transition spectroscopy, and the readout laser is locked by modulation-free frequency locking technology based on Doppler effect. Injection locking is carried out to boost the power of the 657 nm master clock transition laser, thus ensuring the comparison...
November 27, 2017: Optics Express
https://www.readbyqxmd.com/read/29221067/robust-6-dof-motion-sensing-for-an-arbitrary-rigid-body-by-multi-view-laser-doppler-measurements
#5
Yunpu Hu, Leo Miyashita, Yoshihiro Watanabe, Masatoshi Ishikawa
We propose a novel method for the robust, non-contact, and six degrees of freedom (6-DOF) motion sensing of an arbitrary rigid body using multi-view laser Doppler measurements. The proposed method reconstructs the 6-DOF motion from fragmentary velocities on the surface of the target. It is unique compared to conventional contact-less motion sensing methods since it is robust against lack-of-feature objects and environments. By discussing the formulation of motion reconstruction by fragmentary velocities, we show that at least three viewpoints are essential for 6-DOF motion reconstruction...
November 27, 2017: Optics Express
https://www.readbyqxmd.com/read/29218511/optical-monitoring-of-cerebral-microcirculation-in-neurointensive-care
#6
Peter Rejmstad, Neda Haj-Hosseini, Oscar Åneman, Karin Wårdell
Continuous optical monitoring of local cerebral microcirculation could benefit neurointensive care patients treated for subarachnoid hemorrhage (SAH). The aim of the study was to evaluate laser Doppler flowmetry (LDF) and diffuse reflectance spectroscopy (DRS) for long-term monitoring of brain microcirculation and oxygen saturation (SO2) in the neurointensive care unit (NICU). A fiber optic probe was designed for intraparenchymal use and connected to LDF and DRS for assessment of the local blood flow (perfusion and tissue reflectance (TLI)) and SO2 in the brain...
December 8, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29212216/naringin-improves-random-skin-flap-survival-in-rats
#7
Liang Cheng, Tingxiang Chen, Qiming Tu, Hang Li, Zhenghua Feng, Zhijie Li, Dingsheng Lin
Background: Random-pattern flap transfer is commonly used to treat soft-tissue defects. However, flap necrosis remains a serious problem. Naringin accelerates angiogenesis by activating the expression of vascular endothelial growth factor (VEGF). In the present study, we investigated whether naringin improves the survival of random skin flaps. Results: Compared with controls, the naringin-treated groups exhibited significantly larger mean areas of flap survival, significantly increased SOD activity and VEGF expression, and significantly reduced MDA level...
November 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/29200907/chronic-cerebral-hypoperfusion-and-plasticity-of-the-posterior-cerebral-artery-following-permanent-bilateral-common-carotid-artery-occlusion
#8
Kyung-Ok Cho, Seul-Ki Kim, Seong Yun Kim
Vascular dementia (VaD) is a group of heterogeneous diseases with the common feature of cerebral hypoperfusion. To identify key factors contributing to VaD pathophysiology, we performed a detailed comparison of Wistar and Sprague-Dawley (SD) rats subjected to permanent bilateral common carotid artery occlusion (BCCAo). Eight-week old male Wistar and SD rats underwent BCCAo, followed by a reference memory test using a five-radial arm maze with tactile cues. Continuous monitoring of cerebral blood flow (CBF) was performed with a laser Doppler perfusion imaging (LDPI) system...
November 2017: Korean Journal of Physiology & Pharmacology
https://www.readbyqxmd.com/read/29197972/prognostic-value-of-intraoperative-measurements-of-renal-tissue-oxygenation-and-microcirculation-on-renal-function-in-partial-nephrectomy
#9
Matthias Maruschke, Katja Hagel, Oliver Hakenberg, Thomas Scheeren
BACKGROUND: Partial nephrectomy (PNx) can be associated with macrocirculatory and microcirculatory alterations, ultimately leading to acute kidney injury (AKI). Measuring kidney tissue oxygenation (μHbO2) and microcirculation during open PNx might be feasible to early detect these alterations and prevent postoperative AKI. METHODS: μHbO2 and microcirculation were measured in 45 patients undergoing PNx by reflectance spectrophotometry and laser Doppler flowmetry (O2C™, Lea, Germany), related to ischemia time and tumour size...
December 2, 2017: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/29197931/effects-of-supervised-exercise-training-on-lower-limb-cutaneous-microvascular-reactivity-in-adults-with-venous-ulcers
#10
Garry A Tew, Anil Gumber, Emma McIntosh, Sue Kesterton, Brenda King, Jonathan A Michaels, Markos Klonizakis
PURPOSE: To investigate the effects of a 12-week supervised exercise programme on lower-limb cutaneous microvascular reactivity in adults with venous leg ulceration. METHODS: Thirty-eight adults with unilateral venous ulceration who were being treated with lower-limb compression therapy (58% male; mean age 65 years; median ulcer size 5 cm2) were randomly allocated to exercise or control groups. Exercise participants (n = 18) were invited to attend thrice weekly sessions of lower-limb aerobic and resistance exercise for 12 weeks...
December 2, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29197603/a-reliable-mouse-model-of-hindlimb-gangrene
#11
Punam P Parikh, Diego Castilla, Roberta M Lassance-Soares, Hongwei Shao, Manuela Regueiro, Yan Li, Roberto Vazquez-Padron, Keith A Webster, Zhao-Jun Liu, Omaida C Velazquez
INTRODUCTION: Lack of a reliable hindlimb gangrene animal model limits pre-clinical studies of gangrene, a severe form of critical limb ischemia (CLI). We develop a novel mouse hindlimb gangrene model to facilitate translational studies. METHODS: BALB/c, FVB and C57BL/6 mice underwent femoral artery ligation (FAL) with or without administration of NG-nitro-L-arginine methyl ester (L-NAME), an endothelial nitric oxide synthase (eNOS) inhibitor. Gangrene was assessed using standardized ischemia scores ranging from 0 (no gangrene) to 12 (forefoot gangrene)...
November 29, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29190969/effect-of-oxytocin-on-the-survival-of-random-skin-flaps
#12
Peng-Fu Xu, Miao-Jie Fang, Yu-Zhi Jin, Le-Sha Wang, Ding-Sheng Lin
Random flap transplantation is widely used to repair and rebuild skin soft tissue. However, such flaps exhibit poor survival. Plastic surgeons seek to improve flap survival. We explored whether oxytocin improved skin flap survival. Overlength random skin flaps (9 × 3 cm) were established on backs of 80 healthy male SD rats randomly divided into two groups. One group was injected daily with oxytocin (1 mg/kg; test group) and the other with normal saline (control group). On postoperative day 2, malondialdehyde (MDA) and superoxide dismutase (SOD) levels were measured...
November 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/29188644/-study-on-using-laser-doppler-flowmetry-to-determine-the-pulpal-blood-flow-of-immature-maxillary-incisors
#13
Ma Ninghu, Xiao Gang, Zhang Yuanyuan, Zhang Lin, He Shuyang, Dai Shanshan, Li Yangcheng, Guo Qingyu
OBJECTIVE: This study aimed to evaluate the influence of age on the pulpal blood flow (PBF) of immature maxillary incisors of maxillary incisors, which was detected by laser Doppler flowmetry (LDF). METHODS: LDF was used to detect the PBF value of maxillary central and lateral incisors of a child group (aged 7-13 years old) and a positive control group (aged 18-25 years old), as well as the central incisor of a negative control group (the central incisor had undergone endodontic treatment)...
October 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29184734/the-delay-phenomenon-is-one-surgical-delay-technique-superior
#14
Robert P Gersch, Mitchell S Fourman, Cristina Dracea, Duc T Bui, Alexander B Dagum
Background: Surgical delay remains a common method for improving flap survival. However, the optimal surgical technique has not been determined. In this article, we compare flap perfusion, viable surface area, and flap contraction of 2 surgical delay techniques. Methods: Male Sprague-Dawley rats were divided into 3 groups. In the incisional surgical delay group (n = 9), a 9 × 3 cm dorsal flap was incised on 3 sides without undermining, leaving a cranial pedicle...
October 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/29183321/effects-of-controlled-hypoxemia-or-hypovolemia-on-global-and-intestinal-oxygenation-and-perfusion-in-isoflurane-anesthetized-horses-receiving-an-alpha-2-agonist-infusion
#15
Klaus Hopster, Liza Wittenberg-Voges, Florian Geburek, Charlotte Hopster-Iversen, Sabine B R Kästner
BACKGROUND: Aim of this prospective experimental study was to assess effects of systemic hypoxemia and hypovolemia on global and gastrointestinal oxygenation and perfusion in anesthetized horses. Therefore, we anesthetized twelve systemically healthy warmblood horses using either xylazine or dexmedetomidine for premedication and midazolam and ketamine for induction. Anesthesia was maintained using isoflurane in oxygen with either xylazine or dexmedetomidine and horses were ventilated to normocapnia...
November 28, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29182953/the-use-of-laser-doppler-flowmetry-to-evaluate-oral-soft-tissue-blood-flow-in-humans-a-review
#16
REVIEW
Ayepa Alain Kouadio, Fabienne Jordana, N'goran Justin Koffi, Pierre Le Bars, Assem Soueidan
The objective of this work is to define the conditions for improving the use of laser Doppler flowmetry (LDF) and to determine the limits for the use of this technique. This article systematically reviews the literature on the evaluation of oral soft tissue blood microcirculation by LDF. We analysed the available literature through October 2016 using the database resources Medline/PubMed, the Cochrane Oral Health Group Specialist Trials Register and the ISI Web of Knowledge. Several points emerged from this literature review The use of LDF involves specific constraints; however, the influence of different factors (temperature, tobacco, pressure etc...
November 22, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29177979/photobiomodulation-effect-on-children-s-scars
#17
Jehan Alsharnoubi, Omnia Mohamed
The management of burn scars has become one of the major clinical challenges in the developing countries which involve enormous treatment cost; this needs new methods for better cost benefit relationship. The objective of the study is to analyze the effectiveness of low-level laser therapy on post-burn scar tissue in children. A randomized controlled study included 15 children, ranging from 2 to 10 years of age, presenting with burn scars. They received diode laser and topical treatment. Each scar was divided into two halves...
November 24, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29172821/risk-of-donor-demise-after-laser-therapy-for-twin-twin-transfusion-when-complicated-by-growth-discordance-and-abnormal-umbilical-artery-doppler-findings
#18
Matthew M Finneran, Megan A Templin, Courtney D Stephenson
OBJECTIVE: To investigate the natural course of abnormal umbilical artery Doppler (UAD) findings in donor fetuses after laser surgery and the prognostic significance of resolution, persistence, or new onset UAD abnormalities with and without the presence of preoperative growth discordance. STUDY DESIGN: Retrospective cohort study of all monochorionic-diamniotic multi-fetal gestations diagnosed with twin-twin transfusion syndrome (TTTS) undergoing laser surgery at a single large metropolitan referral center from 2010-2016...
November 27, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29167120/acute-lysyl-oxidase-inhibition-alters-microvascular-function-in-normotensive-but-not-hypertensive-men-and-women
#19
Daniel H Craighead, Huilei Wang, Lakshmi Santhanam, Lacy M Alexander
The Lysyl oxidase (LOX) family of enzymes regulates collagen cross-linking. LOX is upregulated in hypertension, increasing vascular stiffness. In vivo human research is sparse as long-term LOX inhibition in animals causes vascular instability. Our aim was to evaluate the effects of LOX inhibition on cutaneous microvascular function to determine if LOX function was upregulated in hypertensive humans. Four intradermal microdialysis fibers were placed in the forearm of 10 young (age: 24±1 y, MAP: 87±2 mmHg), 10 normotensive (age: 50±2 y, MAP: 84±1 mmHg), and 10 hypertensive (age: 53±2 y, MAP 112±2 mmHg) subjects...
November 22, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29166102/testing-the-limits-of-the-maxwell-distribution-of-velocities-for-atoms-flying-nearly-parallel-to-the-walls-of-a-thin-cell
#20
Petko Todorov, Daniel Bloch
For a gas at thermal equilibrium, it is usually assumed that the velocity distribution follows an isotropic 3-dimensional Maxwell-Boltzmann (M-B) law. This assumption classically implies the assumption of a "cos θ" law for the flux of atoms leaving the surface. Actually, such a law has no grounds in surface physics, and experimental tests of this assumption have remained very few. In a variety of recently developed sub-Doppler laser spectroscopy techniques for gases one-dimensionally confined in a thin cell, the specific contribution of atoms moving nearly parallel to the boundary of the vapor container becomes essential...
November 21, 2017: Journal of Chemical Physics
keyword
keyword
32980
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"