Surveillance for Hemodialysis Access Stenosis: Usefulness of Ultrasound Vector Volume Flow

2016 ◽  
Vol 17 (6) ◽  
pp. 483-488 ◽  
Author(s):  
Andreas H. Brandt ◽  
Jonas Jensen ◽  
Kristoffer L. Hansen ◽  
Peter Hansen ◽  
Theis Lange ◽  
...  
Keyword(s):  
Volume Flow ◽  
Hemodialysis Access ◽  
Vector Volume

scholarly journals Vector volume flow in arteriovenous fistulas

2013 ◽  
Author(s):  
Peter Moller Hansen ◽  
Soren Heerwagen ◽  
Mads Moller Pedersen ◽  
Marianne Rix ◽  
Lars Lonn ◽  
...  
Keyword(s):  
Volume Flow ◽  
Arteriovenous Fistulas ◽  
Vector Volume

Novel epoxy/anhydride alternatives for biological electron microscopy: Physical and performance characteristis of embed 812 and LX 112 in combination with NSA/NMA/DMAE

1989 ◽  
Vol 47 ◽  
pp. 1000-1001
Author(s):  
Joe A. Mascorro ◽  
Gerald S. Kirby
Keyword(s):  
Electron Microscopy ◽  
Flow Rate ◽  
Succinic Anhydride ◽  
Volume Flow Rate ◽  
Mass Density ◽  
Uranyl Acetate ◽  
Volume Flow ◽  
Base Resin ◽  
And Performance ◽  
Acid Anhydrides

Embedding media based upon an epoxy resin of choice and the acid anhydrides dodecenyl succinic anhydride (DDSA), nadic methyl anhydride (NMA), and catalyzed by the tertiary amine 2,4,6-Tri(dimethylaminomethyl) phenol (DMP-30) are widely used in biological electron microscopy. These media possess a viscosity character that can impair tissue infiltration, particularly if original Epon 812 is utilized as the base resin. Other resins that are considerably less viscous than Epon 812 now are available as replacements. Likewise, nonenyl succinic anhydride (NSA) and dimethylaminoethanol (DMAE) are more fluid than their counterparts DDSA and DMP- 30 commonly used in earlier formulations. This work utilizes novel epoxy and anhydride combinations in order to produce embedding media with desirable flow rate and viscosity parameters that, in turn, would allow the medium to optimally infiltrate tissues. Specifically, embeding media based on EmBed 812 or LX 112 with NSA (in place of DDSA) and DMAE (replacing DMP-30), with NMA remaining constant, are formulated and offered as alternatives for routine biological work.Individual epoxy resins (Table I) or complete embedding media (Tables II-III) were tested for flow rate and viscosity. The novel media were further examined for their ability to infilftrate tissues, polymerize, sectioning and staining character, as well as strength and stability to the electron beam and column vacuum. For physical comparisons, a volume (9 ml) of either resin or media was aspirated into a capillary viscocimeter oriented vertically. The material was then allowed to flow out freely under the influence of gravity and the flow time necessary for the volume to exit was recored (Col B,C; Tables). In addition, the volume flow rate (ml flowing/second; Col D, Tables) was measured. Viscosity (n) could then be determined by using the Hagen-Poiseville relation for laminar flow, n = c.p/Q, where c = a geometric constant from an instrument calibration with water, p = mass density, and Q = volume flow rate. Mass weight and density of the materials were determined as well (Col F,G; Tables). Infiltration schedules utilized were short (1/2 hr 1:1, 3 hrs full resin), intermediate (1/2 hr 1:1, 6 hrs full resin) , or long (1/2 hr 1:1, 6 hrs full resin) in total time. Polymerization schedules ranging from 15 hrs (overnight) through 24, 36, or 48 hrs were tested. Sections demonstrating gold interference colors were collected on unsupported 200- 300 mesh grids and stained sequentially with uranyl acetate and lead citrate.

Venous Rupture Complicating Hemodialysis Access Angioplasty: Percutaneous Treatments and Outcomes

2002 ◽  
Vol 46 (3) ◽  
pp. 221
Author(s):  
Youn Jong La ◽  
Dong Erk Goo ◽  
Dae Ho Kim ◽  
Hae Kyoung Lee ◽  
Hyun Suk Hong ◽  
...  
Keyword(s):  
Hemodialysis Access

Slip And Hall Effects On The Flow Of A Hyperbolic Tangent Fluid Through Porous Medium In A Planar Channel With Peristalsis

GIS Business ◽  
2020 ◽  
Vol 15 (1) ◽  
pp. 383-394
Author(s):  
K. Shalini ◽  
K.Rajasekhar
Keyword(s):  
Porous Medium ◽  
Pressure Gradient ◽  
Volume Flow Rate ◽  
Perturbation Technique ◽  
Volume Flow ◽  
Planar Channel ◽  
Hyperbolic Tangent ◽  
Closed Form Solutions ◽  
Long Wavelength ◽  
Hall Effects

In this paper, the effect of Slip and Hall effects on the flow of Hyperbolic tangent fluid through a porous medium in a planar channel with peristalsis under the assumption of long wavelength is investigated. A Closed form solutions are obtained for axial velocity and pressure gradient by employing perturbation technique. The effects of various emerging parameters on the pressure gradient, time averaged volume flow rate and frictional force are discussed with the aid of graphs.

Assessment of a policy to reduce placement of prosthetic hemodialysis access

2001 ◽  
Vol 59 (6) ◽  
pp. 2335 ◽  
Author(s):  
Kathleen D. Gibson ◽  
Michael T. Caps ◽  
Ted R. Kohler ◽  
Thomas S. Hatsukami ◽  
Daniel L. Gillen ◽  
...  
Keyword(s):  
Hemodialysis Access

Redo Hemodialysis Access In Elderly Patients Has Acceptable Outcomes With Similar Patency Of Arteriovenous Fistulas As Compared To Grafts

2021 ◽  
Vol 71 ◽  
pp. 454-455
Author(s):  
M. Libby Weaver ◽  
Courtenay M. Holscher ◽  
Rebecca A. Sorber ◽  
Thomas Reifsnyder
Keyword(s):  
Elderly Patients ◽  
Hemodialysis Access ◽  
Arteriovenous Fistulas
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