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Noninvasive hemodynamic

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https://www.readbyqxmd.com/read/28227045/noninvasive-simultaneous-measurement-of-blood-pressure-and-blood-flow-velocity-for-hemodynamic-analysis
#1
Yuki Kato, Shunsuke Yoshimoto, Yoshihiro Kuroda, Masataka Imura, Shingo Yamashita, Toshihiko Ogura, Osamu Oshiro, Yuki Kato, Shunsuke Yoshimoto, Yoshihiro Kuroda, Masataka Imura, Shingo Yamashita, Toshihiko Ogura, Osamu Oshiro, Osamu Oshiro, Yuki Kato, Yoshihiro Kuroda, Masataka Imura, Shunsuke Yoshimoto, Shingo Yamashita, Toshihiko Ogura
We describe a noninvasive and simultaneous measurement method of beat-by-beat blood pressure and blood flow velocity waveforms in the radial artery using tonometry and Doppler flowmetry. We conducted a subjective experiment in which hold-down pressure of tonometry was controlled for determining optimal hold-down pressure and the measurement accuracy under the optimal hold-down pressure was evaluated. As a result, blood pressure and blood flow velocity could be measured simultaneously without the influence of the hold-down pressure on the blood flow velocity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28217052/topical-versus-caudal-ketamine-bupivacaine-combination-for-postoperative-analgesia-in-children-undergoing-inguinal-herniotomy
#2
Hala Saad Abdel-Ghaffar, Seham Mohamed Moeen, Ahmed Mohamed Moeen
BACKGROUND: Multiple studies claim that caudal administration of ketamine causes effective postoperative analgesia. The aim of this study was to assess the clinical effectiveness of ketamine after caudal or topical administration in pediatric patients undergoing inguinal herniotomy. PATIENTS AND METHODS: This randomized, comparative, double-blind study included eighty children (aged 6 months to 6 years) received either 1 ml/kg of 0.25% bupivacaine/ketamine 0.5 mg/kg for caudal analgesia (caudal group) or 0...
January 2017: Saudi Journal of Anaesthesia
https://www.readbyqxmd.com/read/28209582/noninvasive-evaluation-of-cbf-and-perfusion-delay-of-moyamoya-disease-using-arterial-spin-labeling-mri-with-multiple-postlabeling-delays-comparison-with-15-o-gas-pet-and-dsc-mri
#3
S Hara, Y Tanaka, Y Ueda, S Hayashi, M Inaji, K Ishiwata, K Ishii, T Maehara, T Nariai
BACKGROUND AND PURPOSE: Arterial spin-labeling MR imaging with multiple postlabeling delays has a potential to evaluate various hemodynamic parameters. To clarify whether arterial spin-labeling MR imaging can identify CBF and perfusion delay in patients with Moyamoya disease, we compared arterial spin-labeling, DSC, and (15)O-gas PET in terms of their ability to identify these parameters. MATERIALS AND METHODS: Eighteen patients with Moyamoya disease (5 men, 13 women; ages, 21-55 years) were retrospectively analyzed...
February 16, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28199219/clinical-applications-of-near-infrared-diffuse-correlation-spectroscopy-and-tomography-for-tissue-blood-flow-monitoring-and-imaging
#4
Yu Shang, Ting Li, Guoqiang Yu
Near-infrared (NIR) light enables the deep tissue investigation of microvascular hemodynamics. Blood flow is one such available observable promoting a wealth of physiological insight both individually and in combination with other metrics. Diffuse correlation spectroscopy (DCS) and, to a lesser extent, diffuse correlation tomography (DCT), have received interest over the past two decades as noninvasive methods for tissue blood flow measurement and imaging. DCS employs coherent point-illumination NIR light to penetrate deep tissues and commonly uses avalanche photodiodes to detect temporal speckle fluctuations of the diffuse light in a single speckle area of tissue surface, which are sensitive to the motions of red blood cells in the microvasculature of the detected tissue volume...
February 15, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28198458/a-simple-method-for-noninvasive-quantification-of-pressure-gradient-across-the-pulmonary-valve
#5
Xueying Zhou, Changyang Xing, Yang Feng, Yunyou Duan, Qiangsun Zheng, Zuojun Wang, Jie Liu, Tiesheng Cao, Lijun Yuan
Pressure gradient across the pulmonary valve (PVPG) is an important hemodynamic variable used in the management of patients with cardiovascular and pulmonary disease. However, a reliable noninvasive method is unavailable. We hypothesized that a progressive Muller maneuver would elicit the pulmonary valve premature opening (PVPO) in diastole and that this event would be detectable by Doppler echocardiography. The intrathoracic pressure (ITP) decrease during this maneuver equals PVPG, which may be assessed with a custom airway pressure measurement device...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28185475/4d-flow-magnetic-resonance-imaging-role-in-pediatric-congenital-heart-disease
#6
Claire M Lawley, Kathryn M Broadhouse, Fraser M Callaghan, David S Winlaw, Gemma A Figtree, Stuart M Grieve
Imaging-based evaluation of cardiac structure and function remains paramount in the diagnosis and monitoring of congenital heart disease in childhood. Accurate measurements of intra- and extracardiac hemodynamics are required to inform decision making, allowing planned timing of interventions prior to deterioration of cardiac function. Four-dimensional flow magnetic resonance imaging is a nonionizing noninvasive technology that allows accurate and reproducible delineation of blood flow at any anatomical location within the imaging volume of interest, and also permits derivation of physiological parameters such as kinetic energy and wall shear stress...
January 1, 2017: Asian Cardiovascular & Thoracic Annals
https://www.readbyqxmd.com/read/28178891/up-regulation-of-cerebral-cytochrome-c-oxidase-and-hemodynamics-by-transcranial-infrared-laser-stimulation-a-broadband-near-infrared-spectroscopy-study
#7
Xinlong Wang, Fenghua Tian, Divya D Reddy, Sahil S Nalawade, Douglas W Barrett, Francisco Gonzalez-Lima, Hanli Liu
Transcranial infrared laser stimulation (TILS) is a noninvasive form of brain photobiomulation. Cytochrome-c-oxidase (CCO), the terminal enzyme in the mitochondrial electron transport chain, is hypothesized to be the primary intracellular photoacceptor. We hypothesized that TILS up-regulates cerebral CCO and causes hemodynamic changes. We delivered 1064-nm laser stimulation to the forehead of healthy participants ( n = 11), while broadband near-infrared spectroscopy was utilized to acquire light reflectance from the TILS-treated cortical region before, during, and after TILS...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28160856/vasculoprotective-and-vasodilatation-effects-of-herbal-formula-sahatsatara-and-piperine-in-spontaneously-hypertensive-rats
#8
Suksalin Booranasubkajorn, Sukit Huabprasert, Jantanee Wattanarangsan, Pruksa Chotitham, Pinpilai Jutasompakorn, Tawee Laohapand, Pravit Akarasereenont, Pinpat Tripatara
BACKGROUND: The herbal formula (Sahatsatara, STF), the Thai traditional poly-herbal recipe, has been used for treatment of muscle pain, anti-flatulence and numbness on hands and feet, with the caution when used in hypertensive patients. However, there is no scientific evidence to prove its effects on cardiovascular system. Piperine is the proposed major active compound in STF. It is shown to have antihypertensive effect in the L-NAME-induced endothelial dysfunction rats. PURPOSE: This study investigated the pharmacokinetics, mechanism of action, as well as the hemodynamic and vasoactive effect and toxicity of STF and piperine using spontaneously hypertensive rats (SHR) and normal Wistar rats (NWR)...
January 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28152241/invalidation-of-fmri-experiments-secondary-to-neurovascular-uncoupling-in-patients-with-cerebrovascular-disease
#9
Andrea E Para, Kevin Sam, Julien Poublanc, Joseph A Fisher, Adrian P Crawley, David J Mikulis
PURPOSE: Blood oxygen level-dependent (BOLD) functional magnetic resonance imaging (fMRI) is a technique used to infer neuronal activity from the observed changes in blood flow. Cerebrovascular reactivity (CVR) is the ability of arterioles to increase blood flow in response to vasodilatory stimulus. We hypothesize that in areas of disease where there is exhausted vascular reserve and impaired CVR there will be diminished blood flow response following neuronal activation, and that these areas would appear as false-negative tests on BOLD fMRI...
February 2, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28151494/relationship-between-maternal-hemodynamics-and-plasma-natriuretic-peptide-concentrations-during-pregnancy-complicated-by-preeclampsia-and-fetal-growth-restriction
#10
S R Giannubilo, A Pasculli, E Tidu, A Biagini, V Boscarato, A Ciavattini
OBJECTIVE: A proper maternal cardiovascular adaptation to the pregnancy plays a key role for promoting an adequate uteroplacental perfusion, for ensuring normal fetal development and for preventing gestational hypertensive complications such as preeclampsia. This study aims to evaluate hemodynamic measurements obtained by noninvasive methods among preclamptic women with and without fetal growth restriction (FGR) and the relationship with plasma levels of natriuretic peptides. STUDY DESIGN: The study compared 98 pregnant women (n=48 with preeclampsia; n=50 normotensive pregnant women) and 50 nonpregnant normotensive control subjects undergoing anultrasonic cardiac output monitor (USCOM) and plasma assessment of atrial N-terminal pro B-type natriuretic peptide (NT-proBNP)...
February 2, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28149675/computer-simulation-of-cerebral-arteriovenous-malformation-validation-analysis-of-hemodynamics-parameters
#11
Y Kiran Kumar, Shashi Bhushan Mehta, Manjunath Ramachandra
PROBLEM: The purpose of this work is to provide some validation methods for evaluating the hemodynamic assessment of Cerebral Arteriovenous Malformation (CAVM). This article emphasizes the importance of validating noninvasive measurements for CAVM patients, which are designed using lumped models for complex vessel structure. METHODS: The validation of the hemodynamics assessment is based on invasive clinical measurements and cross-validation techniques with the Philips proprietary validated software's Qflow and 2D Perfursion...
2017: PeerJ
https://www.readbyqxmd.com/read/28149028/comparative-evaluation-of-central-venous-pressure-and-sonographic-inferior-vena-cava-variability-in-assessing-fluid-responsiveness-in-septic-shock
#12
Manjri Garg, Jyotsna Sen, Sandeep Goyal, Dhruva Chaudhry
OBJECTIVE: Fluid infusion, the most critical step in the resuscitation of patients with septic shock, needs preferably continuous invasive hemodynamic monitoring. The study was planned to evaluate the efficacy of ultrasonographically measured inferior vena cava collapsibility index (IVC CI) in comparison to central venous pressure (CVP) in predicting fluid responsiveness in septic shock. MATERIALS AND METHODS: Thirty-six patients of septic shock requiring ventilatory support (invasive/noninvasive) were included...
December 2016: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28116679/comparison-of-echocardiography-cardiac-magnetic-resonance-and-computed-tomographic-imaging-for-the-evaluation-of-left-ventricular-myocardial-function-part-2-diastolic-and-regional-assessment
#13
REVIEW
Menhel Kinno, Prashant Nagpal, Stephen Horgan, Alfonso H Waller
Assessing left ventricular diastolic and regional function is a crucial part of the cardiovascular evaluation. Diastolic function is as important as systolic function for left ventricular performance because it is the determinant of the ability of the left atrium and ventricle to fill at relatively low pressures. Additionally, diastolic function plays an important role in the management and prognosis of patients with symptoms and signs of heart failure. Technical advances in the imaging modalities have allowed a comprehensive noninvasive assessment of global and regional cardiac mechanics and precise estimation of cardiovascular hemodynamics...
January 2017: Current Cardiology Reports
https://www.readbyqxmd.com/read/28115510/abnormal-wave-reflections-and-left-ventricular-hypertrophy-late-after-coarctation-of-the-aorta-repair
#14
Michael A Quail, Rebekah Short, Bejal Pandya, Jennifer A Steeden, Abbas Khushnood, Andrew M Taylor, Patrick Segers, Vivek Muthurangu
Patients with repaired coarctation of the aorta are thought to have increased afterload due to abnormalities in vessel structure and function. We have developed a novel cardiovascular magnetic resonance protocol that allows assessment of central hemodynamics, including central aortic systolic blood pressure, resistance, total arterial compliance, pulse wave velocity, and wave reflections. The main study aims were to (1) characterize group differences in central aortic systolic blood pressure and peripheral systolic blood pressure, (2) comprehensively evaluate afterload (including wave reflections) in the 2 groups, and (3) identify possible biomarkers among covariates associated with elevated left ventricular mass (LVM)...
March 2017: Hypertension
https://www.readbyqxmd.com/read/28110456/facial-skin-blood-flow-responses-during-exposures-to-emotionally-charged-movies
#15
Kanji Matsukawa, Kana Endo, Kei Ishii, Momoka Ito, Nan Liang
The changes in regional facial skin blood flow and vascular conductance have been assessed for the first time with noninvasive two-dimensional laser speckle flowmetry during audiovisually elicited emotional challenges for 2 min (comedy, landscape, and horror movie) in 12 subjects. Limb skin blood flow and vascular conductance and systemic cardiovascular variables were simultaneously measured. The extents of pleasantness and consciousness for each emotional stimulus were estimated by the subjective rating from -5 (the most unpleasant; the most unconscious) to +5 (the most pleasant; the most conscious)...
January 21, 2017: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/28106356/accuracy-of-non-invasive-hemoglobin-monitoring-by-pulse-co-oximeter-during-liver-transplantation
#16
Gulay Erdogan Kayhan, Yusuf Z Colak, Mukadder Sanli, Muharrem Ucar, Huseyin I Toprak
BACKGROUND: Hemoglobin level monitoring is essential during liver transplantation (LT) due to substantial blood loss. We evaluated the accuracy of noninvasive and continuous hemoglobin monitoring (SpHb) obtained by a transcutaneous spectrophotometry-based technology (Masimo Corporation, Irvine, CA) compared with conventional laboratory Hb measurement (HbL) during LT. Additionally, we made subgroup analyses for distinct surgical phases that have special features and hemodynamic problems and thus may affect the accuracy of SpHb...
January 20, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28099422/relationship-between-perfusion-index-and-patent-ductus-arteriosus-in-preterm-infants
#17
Enrique Gomez-Pomar, Majd Makhoul, Philip M Westgate, Katrina T Ibonia, Abhijit Patwardhan, Peter J Giannone, Henrietta Bada, Elie G Abu Jawdeh
BACKGROUND: Perfusion index (PI) is a noninvasive measure of perfusion. ΔPI (difference between pre and post-ductal PI) may identify hemodynamically significant PDA. However, studies are limited to brief and intermittent ΔPI sampling. Our objective is to assess the value of continuous high resolution ΔPI monitoring in the diagnosis of PDA. METHODS: Continuous ΔPI monitoring in preterm infants was prospectively performed using two high resolution pulse oximeters...
January 18, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28093805/heartware-ventricular-assist-device-implantation-in-patients-with-fontan-physiology
#18
Bartlomiej R Imielski, Robert A Niebler, Steven J Kindel, Ronald K Woods
We aim to describe the clinical course of a series of patients with hypoplastic left heart syndrome and refractory systolic heart failure supported with a HeartWare ventricular assist device (HVAD) following Fontan palliation. This is a retrospective review of three consecutive patients supported with a HVAD following Fontan palliation through February 2016. Data include patient characteristics, operative variables, postimplantation hemodynamic/device parameters, event outcomes, and duration of HVAD support...
January 2017: Artificial Organs
https://www.readbyqxmd.com/read/28090665/can-patel-s-%C3%AF-accurately-estimate-directionality-of-connections-in-brain-networks-from-fmri
#19
Yunzhi Wang, Olivier David, Xiaoping Hu, Gopikrishna Deshpande
PURPOSE: Investigating directional interactions between brain regions plays a critical role in fully understanding brain function. Consequently, multiple methods have been developed for noninvasively inferring directional connectivity in human brain networks using functional MRI (fMRI). Recent simulations by Smith et al showed that Patel's τ, a method based on higher-order statistics, was the best approach for inferring directional interactions from fMRI. Because simulations make restrictive assumptions about reality, we set out to verify this finding using experimental fMRI data obtained from a three-region network in a rat model with electrophysiological validation...
January 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28078170/computational-fluid-dynamics-assisted-characterization-of-parafoveal-hemodynamics-in-normal-and-diabetic-eyes-using-adaptive-optics-scanning-laser-ophthalmoscopy
#20
Yang Lu, Miguel O Bernabeu, Jan Lammer, Charles C Cai, Martin L Jones, Claudio A Franco, Lloyd Paul Aiello, Jennifer K Sun
Diabetic retinopathy (DR) is the leading cause of visual loss in working-age adults worldwide. Previous studies have found hemodynamic changes in the diabetic eyes, which precede clinically evident pathological alterations of the retinal microvasculature. There is a pressing need for new methods to allow greater understanding of these early hemodynamic changes that occur in DR. In this study, we propose a noninvasive method for the assessment of hemodynamics around the fovea (a region of the eye of paramount importance for vision)...
December 1, 2016: Biomedical Optics Express
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