keyword
MENU ▼
Read by QxMD icon Read
search

Pressure wire

keyword
https://www.readbyqxmd.com/read/28445104/endoscopic-ultrasound-guided-direct-portal-pressure-measurement-using-a-digital-pressure-wire-with-real-time-remote-display-a-survival-study
#1
Allison R Schulman, Christopher C Thompson, Marvin Ryou
BACKGROUND: Portal hypertension is necessary for the development of most clinical complications of cirrhosis. We recently reported a novel, endoscopic ultrasound (EUS)-guided technique for direct portal pressure measurements using a digital pressure wire. AIMS: The aims of this study were to (1) evaluate safety in an animal survival model and (2) compare direct portal vein (PV) versus transhepatic access of a first-order venule. MATERIALS AND METHODS: Yorkshire pigs, weighing 40-55 kg...
April 26, 2017: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/28443325/localized-synthesis-of-conductive-copper-tetracyanoquinodimethane-nanostructures-in-ultra-small-microchambers-for-nanoelectronics
#2
Yanlong Xing, Guoguang Sun, Eugen Speiser, Norbert Esser, Petra S Dittrich
In this work, the microfluidic-assisted synthesis of copper-tetracyanoquinodimethane (Cu-TCNQ) nanostructures in ambient environment is reported for the first time. A two-layer microfluidic device comprising parallel actuated microchambers was used for the synthesis and enabled an excellent fluid handling for the continuous and multiple chemical reactions in confined ultra-small chambers. Different precautions were applied to ensure the reduction state of copper for the synthesis of Cu-TCNQ charge-transfer compounds...
April 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28436918/an-integrated-and-highly-sensitive-ultrafast-acoustoelectric-imaging-system-for-biomedical-applications
#3
Beatrice Berthon, Pierre-Marc Dansette, Mickael Tanter, Mathieu Pernot, Jean Provost
PURPOSE: Direct imaging of cardiac electrical activation is crucial to better understand and diagnose diseases linked to arrhythmias. This work presents an Ultrafast Acoustoelectric Imaging (UAI) system for direct and non-invasive ultrafast mapping of propagating current densities. MATERIALS AND METHODS: Acoustoelectric imaging is based on the acoustoelectric effect, the modulation of the medium's electrical impedance by a propagating ultrasonic wave. UAI triggers this effect with plane wave emissions to image current densities...
April 24, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28436022/ventilation-via-the-2-4%C3%A2-mm-internal-diameter-tritube-%C3%A2-with-cuff%C3%A2-new-possibilities-in-airway-management
#4
REVIEW
M S Kristensen, M W P de Wolf, L S Rasmussen
BACKGROUND: A small tube may facilitate tracheal intubation and improve surgical access. We describe our initial experience with the Tritube(®) that is a novel cuffed endotracheal tube with a 2.4 mm internal diameter. METHODS: The Tritube(®) was used in seven adult Ear-Nose-and Throat surgical patients with airway narrowing or whose surgical access was facilitated by this small-bore endotracheal tube. Ventilation through Tritube(®) is performed with the manually operated Ventrain(®) -ventilator that allows active suctioning during expiration, therefore facilitating normoventilation through small diameter airways...
April 23, 2017: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/28435117/use-of-intracranial-pressure-monitoring-frequently-refutes-diagnosis-of-idiopathic-intracranial-hypertension
#5
David S Xu, Randall J Hlubek, Celene B Mulholland, Kerry L Knievel, Kris A Smith, Peter Nakaji
OBJECTIVE: The diagnosis and management of patients with idiopathic intracranial hypertension (IIH) frequently relies on lumbar puncture to ascertain intracranial pressures. However, pressures derived this way may be spurious due to patient body habitus and behavior. We recently incorporated direct continuous intracranial pressure (ICP) monitoring into the work-up for IIH and review our experience and outcomes. METHODS: Through billing records, we identified all patients during a 3-year period who had a diagnosis of idiopathic intracranial hypertension and who underwent ICP monitoring prior to shunt placement or revision...
April 20, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28418678/radially-ejected-bubbles-driven-by-thermocapillarity-in-equilibrated-vapor-liquid-mixtures
#6
Leonid Rapoport, Matthew Sullivan, Christopher Harrison
We report a novel nucleation method that exploits thermocapillary forces in binary fluids to generate a cloud of bubbles ejected radially from a thermally pulsed wire. The bubbles are nucleated within milliseconds of the extinction of the microsecond pulse and are ejected outward from the wire surface due to the thermocapillary force created by the radial temperature gradient. At low temperatures the surface tension of the vapor-liquid mixture, consisting of ethane-n-octane, increases with increasing temperature, ejecting the bubbles away from the heated wire...
April 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28417536/stretchable-and-soft-electronics-using-liquid-metals
#7
REVIEW
Michael D Dickey
The use of liquid metals based on gallium for soft and stretchable electronics is discussed. This emerging class of electronics is motivated, in part, by the new opportunities that arise from devices that have mechanical properties similar to those encountered in the human experience, such as skin, tissue, textiles, and clothing. These types of electronics (e.g., wearable or implantable electronics, sensors for soft robotics, e-skin) must operate during deformation. Liquid metals are compelling materials for these applications because, in principle, they are infinitely deformable while retaining metallic conductivity...
April 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28414673/purulent-pericarditis-due-to-an-infected-pacemaker-lead
#8
Teresa Backes
INTRODUCTION: Intravenous drug users have a substantially increased risk of infective endocarditis, especially in the setting of implanted cardiac devices. Purulent pericarditis is a rare occurrence that can occur iatrogenically or through direct or hematogenous spread. CASE DESCRIPTION: A 75 year old man with a past medical history significant for hepatitis C, IV drug abuse, and sick sinus syndrome status post pacemaker was brought in by EMS with a chief complaint of diaphoresis and chest pain...
March 2017: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28409833/dietary-salt-blunts-vasodilation-by-stimulating-epithelial-sodium-channels-in-endothelial-cells-from-salt-sensitive-rats
#9
Zi-Rui Wang, Hui-Bin Liu, Ying-Ying Sun, Qing-Qing Hu, Yu-Xia Li, Wei-Wan Zheng, Chang-Jiang Yu, Xin-Yuan Li, Ming-Ming Wu, Bin-Lin Song, Jian-Jun Mu, Zu-Yi Yuan, Zhi-Ren Zhang, He-Ping Ma
BACKGROUND AND PURPOSE: Our recent studies show that the reduced activity of epithelial sodium channels (ENaC) in endothelial cells accounts for the adaptation of vasculature to salt in Sprague-Dawley (SD) rats. The present study examines a hypothesis that enhanced ENaC activity mediates the loss of vasorelaxation in Dahl salt-sensitive (SS) rats. EXPERIMENTAL APPROACH: We used the cell-attached patch-clamp technique to record ENaC activity in split-open mesenteric arteries...
April 13, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28407167/introduction-of-two-novel-stiffness-parameters-and-interpretation-of-air-puff-induced-biomechanical-deformation-parameters-with-a-dynamic-scheimpflug-analyzer
#10
Cynthia J Roberts, Ashraf M Mahmoud, Jeffrey P Bons, Arif Hossain, Ahmed Elsheikh, Riccardo Vinciguerra, Paolo Vinciguerra, Renato Ambrósio
PURPOSE: To investigate two new stiffness parameters and their relationships with the dynamic corneal response (DCR) parameters and compare normal and keratoconic eyes. METHODS: Stiffness parameters are defined as Resultant Pressure at inward applanation (A1) divided by corneal displacement. Stiffness parameter A1 uses displacement between the undeformed cornea and A1 and stiffness parameter highest concavity (HC) uses displacement from A1 to maximum deflection during HC...
April 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28396195/treatment-with-salvianolic-acid-b-restores-endothelial-function-in-angiotensin-ii-induced-hypertensive-mice
#11
Wei Chih Ling, Jian Liu, Chi Wai Lau, Dharmani Devi Murugan, Mohd Rais Mustafa, Yu Huang
Salvianolic acid B (Sal B) is one of the most abundant phenolic acids derived from the root of Danshen with potent anti-oxidative properties. The present study examined the vasoprotective effect of Sal B in hypertensive mice induced by angiotensin II (Ang II). Sal B (25mg/kg/day) was administered via oral gavage for 11days to Ang II (1.2mg/kg/day)-infused C57BL/6J mice (8-10weeks old). The vascular reactivity (both endothelium-dependent relaxations and contractions) in mouse arteries was examined by wire myography...
April 7, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28389343/small-world-human-brain-networks-perspectives-and-challenges
#12
REVIEW
Xuhong Liao, Athanasios V Vasilakos, Yong He
Modelling the human brain as a complex network has provided a powerful mathematical framework to characterize the structural and functional architectures of the brain. In the past decade, the combination of non-invasive neuroimaging techniques and graph theoretical approaches enable us to map human structural and functional connectivity patterns (i.e., connectome) at the macroscopic level. One of the most influential findings is that human brain networks exhibit prominent small-world organization. Such a network architecture in the human brain facilitates efficient information segregation and integration at low wiring and energy costs, which presumably results from natural selection under the pressure of a cost-efficiency balance...
April 5, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28370661/enhancing-the-performance-of-stretchable-conductors-for-e-textiles-by-controlled-ink-permeation
#13
Hanbit Jin, Naoji Matsuhisa, Sungwon Lee, Mohammad Abbas, Tomoyuki Yokota, Takao Someya
Delivery of electronic functionality to the human body using e-textiles is important for realizing the future of wearable electronics. Printing is a promising process for large scale manufacturing of e-textile since it enables arbitrary patterns using a simple and inexpensive process. However, conductive inks printed atop of textile are vulnerable to cracking because of the deformable and porous structure of textiles. The authors develop a mechanically and electrically robust wiring by controlling ink permeation in the structure of textile...
March 29, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28357726/validation-of-the-smart-minimum-ffr-algorithm-in-an-unselected-all-comer-population-of-patients-with-intermediate-coronary-stenoses
#14
Barry Hennigan, Nils Johnson, John McClure, David Corcoran, Stuart Watkins, Colin Berry, Keith G Oldroyd
Using data from a commercial pressure wire system (St. Jude Medical) we previously developed an automated "smart" algorithm to determine a reproducible value for minimum FFR (smFFR) and confirmed that it correlated very closely with measurements made off-line by experienced coronary physiology core laboratories. In this study we used the same "smart" minimum algorithm to analyze data derived from a different, commercial pressure wire system (Philips Volcano) and compared the values obtained to both operator-defined steady state FFR and the online automated minimum FFR reported by the pressure wire analyser...
March 29, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28349710/endovascular-devices-and-revascularization-techniques-for-limb-threatening-ischemia-in-individuals-with-diabetes
#15
Jayer Chung
Diabetes mellitus (DM) is a rapidly worsening global epidemic over the last thirty-five years. The increased prevalence of DM has changed the phenotypic expression of atherosclerotic limb threatening ischemia (LTI), resulting in an increase in lesions in the tibial vessels. These patients are also afflicted with peripheral neuropathy, foot deformities, and medial calcification of the vasculature. In response to the evolving phenotype of atherosclerosis, newer minimally invasive tools and techniques have been developed to improve the blood supply in LTI...
March 1, 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28349647/finite-element-modeling-validation-and-parametric-investigations-of-a-retinal-reattachment-stent
#16
Razvan Rusovici, Dennis Dalli, Kunal Mitra, Gary Ganiban, Michael Grace, Rudy Mazzocchi, Michael Calhoun
A new retinal reattachment surgical procedure is based on a stent which is deployed to press the retina back in place. An eye-stent finite element model studied the strain induced by the stent on retina. FEM simulations were performed for several stent geometric configurations (number of loops, wire diameter, intraocular pressure). The FEM was validated against experiment. Parametric studies demonstrated that stents could be successfully designed so that the maximum strain would be below permanent damage strain threshold of 2%...
March 27, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28337283/intracoronary-hypothermia-for-acute-myocardial-infarction-in-the-isolated-beating-pig-heart
#17
Luuk C Otterspoor, Lokien X van Nunen, Tilaï T Rosalina, Marcel Van't Veer, Sjoerd Van Tuijl, Marco Stijnen, Marcel Cm Rutten, Frans N van de Vosse, Nico Hj Pijls
Hypothermia may attenuate reperfusion injury and thereby improve acute myocardial infarction therapy. Systemic cooling trials failed to reduce infarct size, perhaps because the target temperature was not reached fast enough. The use of selective intracoronary hypothermia combined with intracoronary temperature monitoring allows for titrating to target temperature and optimizing the cooling rate. We aimed to the test the feasibility of intracoronary cooling for controlled, selective myocardial hypothermia in an isolated beating pig heart...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28329078/apical-closure-device-for-full-percutaneous-transapical-valve-implantation-stress-test-in-an-animal-model%C3%A2
#18
Enrico Ferrari, Stefanos Demertzis, Jennifer Angelella, Denis Berdajs, Piergiorgio Tozzi, Tiziano Moccetti, Francesco Maisano, Ludwig K von Segesser
OBJECTIVES: Transapical valve implantation is traditionally performed through a left antero-lateral mini-thoracotomy. A self-expandable apical closure device has recently been developed for full-percutaneous transapical valve implantation. We performed haemodynamics stress-tests on an animal model to evaluate the sealing properties. METHODS: Under general anaesthesia 5 pigs (mean weight: 67 ± 6 Kg) received full heparinization (100 IU/Kg; activated clotting time >250 s and, through inferior mini-sternotomies, 21-Fr introducer sheaths for transapical aortic valve implantation (outer diameter: 25-Fr) were placed over-the-wire in the apexes...
January 31, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28323879/mir-181b-regulates-vascular-stiffness-age-dependently-in-part-by-regulating-tgf-%C3%AE-signaling
#19
Daijiro Hori, Brittany Dunkerly-Eyring, Yohei Nomura, Debjit Biswas, Jochen Steppan, Jorge Henao-Mejia, Hideo Adachi, Lakshmi Santhanam, Dan E Berkowitz, Charles Steenbergen, Richard A Flavell, Samarjit Das
BACKGROUND: Endothelial dysfunction and arterial stiffening play major roles in cardiovascular diseases. The critical role for the miR-181 family in vascular inflammation has been documented. Here we tested whether the miR-181 family can influence the pathogenesis of hypertension and vascular stiffening. METHODS AND RESULTS: qPCR data showed a significant decrease in miR-181b expression in the aorta of the older mice. Eight miR-181a1/b1-/- mice and wild types (C57BL6J:WT) were followed weekly for pulse wave velocity (PWV) and blood pressure measurements...
2017: PloS One
https://www.readbyqxmd.com/read/28296167/what-can-intracoronary-pressure-measurements-tell-us-about-flow-reserve-pressure-bounded-coronary-flow-reserve-and-example-application-to-the-randomized-defer-trial
#20
Frederik M Zimmermann, Nico H J Pijls, Bernard De Bruyne, G Jan-Willem Bech, Pepijn van Schaardenburgh, Richard L Kirkeeide, K Lance Gould, Nils P Johnson
OBJECTIVE: We propose a novel technique called pressure-bounded coronary flow reserve (pb-CFR) and demonstrate its application to the randomized DEFER trial. BACKGROUND: Intracoronary flow reserve assessment remains underutilized relative to pressure measurements partly due to less robust tools. METHODS: While rest and hyperemic intracoronary pressure measurements cannot quantify CFR exactly, they do provide upper and lower bounds. We validated pb-CFR invasively against traditional CFR, then applied it to high fractional flow reserve (FFR ≥ 0...
March 15, 2017: Catheterization and Cardiovascular Interventions
keyword
keyword
58937
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"