Search Results
Results 351 - 400 of 1238
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Eloot Sunny - - 2007
BACKGROUND: To reduce infection risks in patients on hemodialysis with a long term central venous catheter, different types of closed luer lock access devices are used on the arterial and venous catheter hub. Although those connectors create a mechanically and microbiologically closed system in between two dialysis sessions, no data ...
Wijnen E - - 2007
A reduction in vascular access flow poses a risk for thrombosis. We present a new technique to measure vascular access flow during dialysis based on extracorporeal temperature gradients, and their changes, on reversing the extracorporeal bloodlines without having to inject an indicator. Fistula temperatures were measured by the blood temperature ...
Dell'Aquila Roberto - - 2007
Automated peritoneal dialysis (APD) has undergone substantial growth in recent years because of an increased demand for higher doses of peritoneal dialysis (PD) treatment and a need to improve quality of life for patients. The evolution of this treatment is closely linked with the development of new automatic machines and ...
Ash Stephen R - - 2007
Over 60% of patients initiating chronic hemodialysis in the United States have a chronic central venous catheter (CVC) as their first blood access device. Although it would be better if these patients started dialysis with fistulas, the CVC is used because it is a reliable and relatively safe method for ...
Prohovnik Isak - - 2007
Patients with end-stage renal disease (ESRD) undergoing hemodialysis are known to suffer cognitive deficits and stroke of unknown etiology. It has been suspected that the treatment itself may contribute to the syndrome by unknown mechanisms, which we investigated in this study. End-stage renal disease patients on hemodialysis (n=19) or peritoneal ...
Shemesh David - - 2007
In our center, we start hemodialysis using arteriovenous accesses empirically 1 mo after surgery in nearly all patients, when the vein diameter reaches 5 mm and blood flow is assumed to be adequate. We measured blood flow and vessel diameter in the maturing autogenous and prosthetic access to determine if ...
Kanno Yoshihiko - - 2007
BACKGROUND: A double-lumen catheter (DLC) is used as a temporary blood access in emergency haemodialysis and continuous haemodialysis. There are various reports concerning thrombosis related to use of DLC and other catheters. The objective of this study is to assess the incidence of venous thrombosis when using DLC in patients ...
Stegmayr Bernd - - 2007
We previously showed, in vitro, that micro bubbles pass the air trap without inducing an alarm. The aim was to investigate if micro bubbles bypass the detector during hemodialysis (HD). During HD (40 patients, 47 HD sessions, 231 measurements), an ultrasound detector was fixed just after the venous air trap. ...
Kato Tatsuo - - 2007
A higher beta(2)-microglobulin (beta(2)MG) removal rate is possible in dual-dialyzer hemodialysis (DDHD) because of the large internal filtration provided. In this treatment, in the first dialyzer, a large amount of water moves from the blood side to the dialysate side, and in the second dialyzer, it moves from the dialysate ...
Seyahi Nurhan - - 2007
BACKGROUND/AIMS: Ideal time needed for arteriovenous fistula (AVF) maturation is still controversial. In this study, we aimed to investigate the natural course of AVF maturation and also investigated the factors affecting AVF maturation. METHODS: We studied 31 (21M/10F, mean age 55.8 +/- 16.2) chronic renal failure patients. We evaluated the ...
Yamamoto Ken-Ichiro - - 2007
Rexeed was developed by Asahi Kasei Medical using wave-shaped hollow fibers, a full baffle, and a short taper housing to improve dialysate flow. The present study is clarifies improvement in dialysate flow with Rexeed-15 compared with that of a conventional dialyzer. Dialysate flow was evaluated by the pulse-response method. Dialysate ...
Yamashita Akihiro C - - 2007
BACKGROUND: Prescribing therapeutic conditions for online predilution hemodiafiltration (HDF) with fixed total dialysate flow rate Q(Dtotal) is not straightforward, since the increase in the substitution fl ow rate Q(S) is compensated by the decrease in the net dialysate flow rate Q(Dnet). METHODS: Clearances of various solutes under online predilution HDF ...
Ghezzi Paolo M - - 2007
In recent years the concept of biocompatibility is not limited to the dialytic membranes, but has been substituted by a more general viewpoint where all the parameters of the dialytic treatment are taken into consideration: the interaction of blood-surfaces (the dialyzer in all its components and the hematic lines), the ...
Ronco Claudio - - 2007
The efficiency of a hemodialyzer is largely dependent on its ability to facilitate diffusion between blood and dialysis solution. The diffusion process can be impaired if there is a mismatch between blood and dialysate flow distribution in the dialyzer. For this reason it is important that average and regional blood ...
Colussi Giacomo - - 2007
In hemofiltration (HF) and hemodiafiltration (HDF), removal of medium and high-molecular-weight solutes is greatly enhanced by convective mechanisms as compared with simple diffusion; increasing convective flows may allow greater removal rates of these solutes. Use of "predilution" (pre-H[D]F) may allow higher ultrafiltration rates than the "postdilution" mode (post-H[D]F); yet, the ...
Shinzato Toru - - 2007
Push/pull hemodiafiltration is characterized by alternate filtration and backfiltration, while sterile pyrogen-free dialysate is flowing through a hemodiafilter. During the filtration phase, uremic substances are eliminated not only by diffusive, but also by convective transport. During the backfiltration phase, dialysate is quickly pushed to the blood side (i.e. backfiltration) so ...
Ronco Claudio - - 2007
The evolution of hemodiafiltration (HDF) has become possible by the advances in the construction of dialysis membranes. The availability of a high-flux membrane, partially hydrophilic with high sieving coefficients and a reduced wall thickness has made it possible to conveniently combine diffusion and convection for blood purification. The second important ...
Ozmen Namik - - 2007
OBJECTIVE: To investigate whether or not P-wave dispersion (PWD) can be used as a good indicator of effective hemodialysis. SUBJECTS AND METHODS: The study included 35 patients (20 males, 15 females, mean age 61 +/- 10 years) who regularly received hemodialysis treatment for chronic renal failure. Following hemodialysis, the patients ...
Wizemann Volker - - 2007
The distinction between high-efficiency haemodiafiltration (HDF), usually applied with online preparation of substitution fluid, and 'classic' low-efficiency HDF (using less than 15 litres of substitution fluid) makes sense since the magnitude of convection (expressed by substitution volume) is important for the claimed benefits of HDF. Many experimental and observational data ...
Unger Juliane K - - 2007
Small intravascular volume, pathophysiological hemorheology, and/or low cardiac output [CO] are assumed to reduce available blood flow rates via common dual-lumen catheters (except for those with a right atrium catheter tip position) in the critically ill patient. We performed an experimental animal study to verify these assumptions. Anesthetized, ventilated pigs ...
Eloot S - - 2006
Dialyser manufacturers only provide limited information about mass removal under well-defined flow and solute conditions in commercially available dialysers for hemodialysis. This computational study aimed at assessing the solute transport efficiency in a dialyser for different geometries (fiber lengths and diameters). A three-dimensional finite volume model of a single fiber ...
Zanow Juergen - - 2006
This study used intraoperative monitoring of the access flow to evaluate the results of flow reduction in the management of high-flow arteriovenous access-related symptoms of distal ischemia and cardiac insufficiency. A retrospective study was conducted of 95 patients (78 with ischemia, 17 with cardiac failure) who underwent flow reduction between ...
Pilcher Thomas A - - 2006
BACKGROUND: Both actively cooled-tip and large-tip catheters are currently available clinically to create large endomyocardial lesions during application of radiofrequency (RF) energy. The purpose of this study was to compare the effect of convective cooling at physiologic flow rates on RF lesion size using both actively cooled and large-tip catheters. ...
Sombolos K - - 2007
BACKGROUND: The aim of the present study was to assess hemoglobin changes occurring at the beginning of high-flux hemodialysis (HD). METHODS: In a group of 20 chronic HD patients (group A), total hemoglobin (tHb), hematocrit (Hct) and total serum proteins (TP) were measured in blood samples drawn from an arterial ...
Ronco Claudio - - 2006
The efficiency of a hemodialyzer is largely dependent on its ability to facilitate diffusion, as this is the main mechanism by which small solutes are removed. The diffusion process can be impaired if there is a mismatch between blood and dialysate flow distribution in the dialyzer. The objective of the ...
Lagali Neil - - 2006
Visible and near infrared transmission and diffuse reflection spectroscopy were used to monitor changes in whole blood resulting from hemodialysis treatment for end-stage renal disease. Blood samples from 8 patients on chronic hemodialysis therapy were measured in the 500- to 1700-nm wavelength range immediately before and after a single treatment. ...
Everdell N L - - 2007
A prototype dialysis system for the treatment of premature babies has been designed, built and successfully tested. It can be used to treat babies who are suffering from renal failure or metabolic disorders. These patients are difficult or impossible to treat conventionally, due to their very small total blood volume ...
Amano Izumi - - 2006
In cases of vascular access (VA) for hemodialysis including arteriovenous fistula and arteriovenous graft, venipuncture and hemostasis are usually repeated three times a week. Accordingly, it is assumed that VA vascular disorders are worsened following long-term hemodialysis. In particular, angiostenosis frequently occurs and results in insufficient blood flow or increased ...
Kondepati Venkata Radhakrishna - - 2006
Application of mid-infrared spectroscopy for the determination of urea in blood plasma dialysates of microliter sample volumes using a transmission microcell was investigated. Infrared spectra of the dialysates of plasma samples collected from 75 different patients using CMA 60 microdialysis catheters were evaluated with multivariate partial least squares regression. Using ...
Lindsay Robert M - - 2006
Measurement of blood flow rate (Qa) is used to monitor arteriovenous fistulas and grafts that are used for hemodialysis blood access. Most Qa measurements use indicator dilution techniques to measure the recirculation that is induced by the reversal of hemodialysis blood lines. R plus the dialysis circuit flow (Qb) allows ...
Leypoldt John K - - 2006
New daily hemodialysis therapies operate at low dialysate flow rates to minimize dialysate volume requirements; however, the dependence of dialyzer clearances and mass transfer-area coefficients for small solutes on dialysate flow rate under these conditions have not been studied extensively. We evaluated in vitro dialyzer clearances for urea and creatinine ...
Wijnen Edwin - - 2006
Periodical access flow measurements can predict the development and presence of vascular access flow-limiting stenosis and subsequent thrombosis. Access flow measurement has become a standard in vascular access care. Different techniques to measure access flow are available. The aim of this study was to compare an integrated access flow measurement ...
Jin Fan - - 2006
Using a special double-layer membrane to avoid interaction among flow fields generated by different pores, we have, for the first time, observed the predicted discontinuous first-order transition in ultrafiltration of flexible linear polymer chains. Namely, the chain could pass through a pore much smaller than its unperturbed radius only when ...
Courrol Lilia C - - 2006
We introduce the use of a lanthanide complex, tetracycline-europium, for the clinical diagnosis of urea hydrogen peroxide in human whole blood. The values obtained agree with the urea concentration variation verified in 49 patients, including 12 predialysis, 12 peritoneal, and 15 dialysis subjects, and 10 controls. This method is noninvasive ...
Uhlin Fredrik - - 2006
BACKGROUND: An on-line monitoring system for dialysis dose calculations could make it possible to provide an adequate dialysis dose that is consistently given to haemodialysis (HD) patients. The aim of this study was to compare dialysis dose (Kt/V) using four different methods and their sensitiveness to a reduction in clearance. ...
Lindley Elizabeth J - - 2006
The discussion explored and expanded on the issues raised by Dasselaar et al in their review of the measurement of relative blood volume (RBV) changes during dialysis (NDT 2005). Dialysis machines incorporating blood volume monitoring and control are widely available in Europe. The use of continuous blood volume monitoring (CBVM) ...
Mandolfo S - - 2006
Blood flow rate is a critical factor in the achievement of an adequate dialysis dose. The aim of this review is to evaluate the possibility of optimizing dialysis dose in terms of Kt/V in patients with reduced vascular access (VA) flow rate, considering effective blood flow (Qb eff), recirculation, access ...
Evenepoel Pieter - - 2006
Albumin dialysis by the molecular adsorbents recirculating system (MARS) and by fractionated plasma separation, adsorption, and dialysis (Prometheus[PROM]) represent novel nonbiological liver support systems specifically designed to remove albumin-bound substances. Preliminary evidence suggests a favorable impact of MARS on the course and outcome of liver failure. This study aimed at ...
Patzer John - - 2006
Toxins that bind to albumin in the bloodstream and are associated with progressing liver failure have proven refractory to removal by conventional hemodialysis. Such toxins can, however, be removed by adding a binder to the dialysate that serves to capture the toxin as it is dialyzed across the membrane. Several ...
Unger Juliane K - - 2006
BACKGROUND: Main factors for the overall performance of haemofilters (HF) are membrane features and filter durability without clogging/clotting of capillaries. However, the venous line resistance (Pv) is a powerful force for net filtrate flux resulting in haemoconcentration and thus is enhancing the phenomenon of membrane clogging. Therefore, we hypothesized that ...
Gabutti Luca - - 2006
BACKGROUND: To treat permanent hemodialysis (HD) catheter dysfunctions due to thrombosis, as an alternative to pre- and intradialytic instillations/infusions of fibrinolytic agents, for practical reasons, a post-dialysis urokinase lock is often preferred. This study aimed to analyze the consequences on catheter function and the cost/effectiveness of an intermittent post-dialysis urokinase ...
Macha Douglas B - - 2006
PURPOSE: To compare the performance characteristics of various single-lumen all-purpose pigtail drainage catheters. MATERIALS AND METHODS: The following parameters were compared: flow rates between catheters of the same size, whether changing the fluid viscosity has any effect on catheter comparisons, the effect on flow of leaving an open three-way stopcock ...
Kalocheretis P - - 2006
AIM/BACKGROUND: The aim of this study was to evaluate the residual blood loss in new type single use dialyzers under the usually prevailing conditions during hemodialysis and to investigate whether or not this loss is dependent on dialyzer membrane composition or flux characteristics. MATERIALS AND METHODS: In 158 hemodialysis (HD) ...
Tessitore Nicola - - 2006
BACKGROUND: Clinical practice for stenosis detection and treatment in arteriovenous fistulas (AVFs) varies widely and is largely dictated by local customs and expertise. METHODS: In May 2003, a questionnaire was sent to 32 hemodialysis (HD) facilities in north-eastern Italy, to assess the prevalence of patients with an AVF; the screening ...
Pannu Neesh - - 2006
Long-term dialysis is often delivered through tunneled central venous catheters (CVC) despite their associated morbidity and mortality rates. Because poor solute clearance might contribute to this risk, we examined the relation between blood pump speed (QB), access recirculation (AR), and dialysis delivery in patients with CVC. We conducted a prospective ...
Mercadal L - - 2006
The optical blood volume curve sometimes presents either a positive or a negative rapid and reversible variation (spike) during the step of the dialysate conductivity, automatically set by the monitor for the ionic dialysance (ID) measurement. We studied whether this feature was in relation with access recirculation. Firstly, we studied ...
Lawrence E L - - 2006
The treatment for urinary incontinence, a common condition affecting a considerable number of older and disabled members of society, involves the use of a Foley catheter for drainage of the bladder. The basic design of the catheter has remained the same for over seventy years. Despite modifications to the materials ...
Van Biesen Wim - - 2006
BACKGROUND: The Genius dialysis system is advocated as a tool to perform slow extended daily dialysis (SLEDD) in patients with acute renal failure at the intensive care unit. At low blood flows however, it is sometimes problematic to maintain sufficient systemic pressure in the dialysate circuit, a problem that can ...
Bolasco P - - 2006
AIM: The purpose of this study was to optimize the operative and analytical methodologies to a more exact determination of intradialytic kinetics of the phosphates (P) tested in hemodialysis (HD) and in on-line hemodiafiltration with endogenous reinfusion (HFR - Hemo Filtrate Reinfusion). METHODS: The mass balance measurements of urea and ...
Ash S R - - 2006
Although highly successful as transcutaneous access devices, today's peritoneal dialysis catheters still have imperfect hydraulic function, biocompatibility and resistance to infection. Success of Tenckhoff catheters is greatly improved by the proper positioning of deep and subcutaneous cuffs and intraperitoneal segment. Newer peritoneal catheter designs are intended to improve hydraulic function, ...
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