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Results 301 - 350 of 1248
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Manikandan Ramaswamy - - 2009
PURPOSE: We evaluated the flow characteristics of various 3-way catheters. MATERIALS AND METHODS: We evaluated 14, 3-way catheters, including 18Fr, 20Fr, 22Fr and 24Fr Rusch(R), 18Fr, 20Fr, 22Fr and 24Fr Bardex(R), 18Fr, 20Fr, 22Fr and 24Fr Dover, and 20Fr and 22Fr Mentor (Mentor, Santa Barbara, California) catheters. Ten operators applied ...
Schneditz Daniel - - 2009
BACKGROUND: Sequestration of creatinine, in both erythrocytes and other cells, has complicated the widespread application of creatinine kinetics in haemodialysis. The goal of this study was to determine whether creatinine kinetics could be described using a regional blood flow (RBF) model that also incorporated diffusion between intra- and extracellular fluids. ...
Kim Jeong Chul - - 2009
BACKGROUND/AIMS: Blood flow profiles in fiber bundles depend on the design of the arterial port and affects the biocompatibility of the hemodialyzer. We analyzed the effects of arterial port design on blood flow distribution in fiber bundles using nonintrusive imaging techniques. METHODS: The velocity fields in arterial ports and the ...
Gregory Martin C - - 2009
INTRODUCTION: Dialysis is an effective treatment for end-stage renal disease, but it is available to only approximately half of those who need it in the world. METHODS: Two prototype passive-flow dialysate delivery systems were constructed. RESULTS: Each dialysate delivery system provided a flow of dialysate in the range of 200-300 ...
Mineshima Michio - - 2009
In order to improve solute removal efficiency, several types of dialyzers with enhanced internal filtration (IF) were introduced for clinical applications. In these dialyzers, enhanced IF increased convective transport of the solute in addition to diffusive transport. Internal filtration-enhanced hemodialysis (IFEHD) defined as hemodialysis therapy using the enhanced IF dialyzer ...
Rostoker Guy - - 2009
It is widely believed that single-needle (SN) hemodialysis is inferior to conventional double-needle (DN) hemodialysis. The purpose of this study was to compare two SN dialysis regimens using different blood flow rates with conventional DN hemodialysis. The primary outcome measure was ionic dialysance. We studied eight patients (two women, six ...
Fleming Geoffrey M - - 2009
Etanercept is a tumor necrosis factor-alpha antagonist used in inflammation-mediated conditions. Continuous venovenous hemofiltration (CVVH) has also been used in patients with inflammatory conditions. This study evaluated etanercept clearance using an in vitro CVVH model. Etanercept clearance was assessed in vitro in bovine blood at 1-3 mg/l final serum concentration, ...
Moragianni Vasiliki A - - 2010
OBJECTIVE: To assess the effect of microscopic and macroscopic contamination of embryo transfer (ET) catheters with blood or mucus on in vitro fertilization (IVF)-ET success rates. DESIGN: Retrospective cohort study. SETTING: Infertility practice in teaching community hospital. PATIENT(S): Four hundred seventy patients undergoing IVF-ET. INTERVENTION(S): Controlled ovarian hyperstimulation and IVF-ET. ...
Berman S S - - 2008
OBJECTIVE: To establish the criteria for intraoperative blood flow measurements taken at the time of autologous arteriovenous fistula (AVF) construction to predict future access maturation and thereby avoid waiting periods for futile fistulas to declare themselves. METHODS: From April 2006 through to March 2007 consecutive patients undergoing native AVF construction ...
Naka T T Department of Intensive Care and Department of Medicine, Austin Hospital, Melbourne - - - 2008
To assess the resistance posed by double-lumen vascular access dialysis catheters at low and high blood flow. Controlled ex vivo study Setting: ICU Laboratory of tertiary hospital. Eleven proprietary vascular access catheters for continuous renal replacement therapy. Heparinized spent red cells diluted in polygeline solution were pumped using the Aquarius ...
Salimi Javad - - 2008
Clinical practice guidelines recommend regular monitoring of hemodialysis (HD) vascular access using methods such as vascular access recirculation (AR), for early detection and correction of access dysfunction. We measured access recirculation using low blood flow method in 51 chronic HD patients. Of these patients, 42 had arteriovenous fistulas and nine ...
Clements David - - 2008
Recirculation during dual lumen veno-venous (DLVV) extracorporeal membrane oxygenation (ECMO) is a dynamic event that results in a fraction of the oxygenated blood exiting the arterial lumen and immediately shunting back into the venous lumen. Excessive recirculation will result in suboptimal oxygen delivery to the patient. Ultrasound dilution is a ...
Lindley Elizabeth J - - 2009
BACKGROUND: The availability of haemodialysis machines equipped with on-line clearance monitoring (OCM) allows frequent assessment of dialysis efficiency and adequacy without the need for blood samples. Accurate estimation of the urea distribution volume 'V' is required for Kt/V calculated from OCM to be consistent with conventional blood sample-based methods. METHODS: ...
Dechmann-Sültemeyer Thomas - - 2009
BACKGROUND: A number of medical, mostly immune-mediated conditions call for a combination therapy consisting of plasmapheresis and haemodialysis. While the two treatments are most commonly applied separately, we describe here the technical details of providing a combined 'tandem' treatment. Method. The components of a dialyzer (polysulfon membrane) and plasma filter ...
Maynor Lena M - - 2008
STUDY OBJECTIVES: To assess the influence of in vitro and in vivo hemodialysis with a new high-flux dialyzer on the clearance of cefazolin and cefepime; to assess the correlation of in vivo dialytic clearance of these antibiotics with blood flow rate; and to assess the correlation between in vitro and ...
Tochihara Yuka - - 2008
BACKGROUND: Haemodialysis (HD) is associated with the acute loss through the dialysis membrane of biochemical factors either enhancing [folic acid (F)] or impairing [asymmetric dimethylarginine (ADMA)] arterial function. Changes in these opposing factors might explain the absence of significant modifications in arterial function during HD. We speculated that intra-HD, instead ...
Krieter Detlef H - - 2008
Optimizing solute removal at minimized albumin loss is a major goal of dialyzer engineering. In a prospective, randomized, crossover study on eight patients (age 63 +/- 14 years) on maintenance hemodialysis, the new Baxter Xenium 170 high-flux dialyzer (BX), which contains a 1.7-m(2) PUREMA H dialysis membrane, was compared with ...
Malik J - - 2008
Distal hypoperfusion ischemic syndrome (DHIS), commonly referred to as hand ischemia or 'steal' after dialysis access placement, occurs in 5-10% of cases when the brachial artery is used, or 10 times that of wrist arteriovenous fistulas (AVFs) using the radial artery. It is typically seen in elderly women with diabetes, ...
Prunet Bertrand - - 2008
BACKGROUND: To reduce the risk of accidental needlestick injuries, first active then passive safety devices were developed on IV catheters. However, whether these catheters are easy to implement and really protect personnel from accidental needlestick is untested. METHODS: In this prospective randomized survey, we compared a passive safety catheter with ...
Leffel Elizabeth K - - 2008
This study was originally designed to collect data on the natural history of inhalational anthrax in a new nonhuman primate model. An uncontrollable event created a new experimental condition which allowed us to retrospectively evaluate the power of the innate immune system to protect from an aerosol exposure of B. ...
Kim J C - - 2008
Perfusion computed tomography (PCT) is a means to rapidly and easily evaluate cerebral perfusion in patients presenting with acute stroke symptoms, which provides insights into capillary-level hemodynamics. In this study, we used PCT to analyze the 3-dimensional dialysate flow in a low-flux hemodialyzer equipped with a standard fiber bundle. The ...
Schlitt Axel - - 2008
BACKGROUND: The Organization to Assess Strategies in Acute Ischemic Syndromes trials showed that fondaparinux (fonda) is at least as effective and safe as unfractionated heparin (UFH) and enoxaparin (enoxa) in acute coronary syndromes. Unexpectedly, there was an increase in catheter-related thrombus formation during percutaneous coronary interventions in fonda-treated patients. METHODS: ...
Tessitore Nicola - - 2008
BACKGROUND: Access blood flow (Qa) measurement is the recommended method for fistula (AVF) surveillance for stenosis, but whether it may be beneficial and cost-effective is controversial. METHODS: We conducted a 5-year controlled cohort study to evaluate whether adding Qa surveillance to unsystematic clinical monitoring (combined with elective stenosis repair) reduces ...
Lin Chia-Hsun - - 2008
Autogenous arteriovenous fistula (AVF) has proven to be the optimal vascular access for the majority of hemodialysis patients due to its durability and low complication rates. The purpose of this study is to determine the value of intraoperative blood flow measurement with respect to AVF short-term outcome. A prospective cohort ...
Ben-Ami Ronen - - 2008
Candida spp. are important causes of nosocomial bloodstream infections. Around 80% of patients with candidemia have an indwelling central venous catheter (CVC). Determining whether the CVC is the source of candidemia has implications for patient management. We assessed whether the time to detection of Candida species in peripheral blood (time ...
Lee Kyungsoo - - 2008
Midsize molecule retention is related with renal-failure-associated mortality. Here, the authors describe a new dialysis modality, pulse push/pull hemodialysis (PPPHD), which increases convective clearance. Blood and dialysate are circulated by a pulsatile pump, but with pulsatile flow patterns that are 180 degrees out of phase. This causes blood-to-dialysate pressure gradients ...
Ashavaid Tester F - - 2008
Preanalytical errors contribute to a large proportion of total laboratory errors. In order to achieve continuous laboratory improvement, it is important to focus on all phases of patient specimen testing i.e. preanalytical, analytical and post-analytical. With large variations in the way venous blood specimens are collected using diverse devices in ...
Tonelli Marcello M Department of Medicine, University of Alberta, Edmonton, Alberta, Canada. - - 2008
Observational studies indicate that routine measurements of access blood flow and use of Doppler ultrasound improve vascular access outcomes in hemodialysis patients, but randomized trials reached conflicting conclusions. Systematic review and meta-analysis. Adult hemodialysis patients with arteriovenous accesses. Randomized trials. Screening with access blood flow measurements or Doppler ultrasound. Thrombosis, ...
Back Martin R - - 2008
BACKGROUND: Persistent poor patency rates of arteriovenous fistulae and bridge grafts for dialysis access prompted us to investigate whether flow parameters derived from an initial postconstruction, precannulation duplex study could predict access longevity or direct remedial procedures to salvage nonmaturing conduits. METHODS: We analyzed 125 consecutive dialysis access conduits (34 ...
Kanagasundaram Nigel S - - 2008
BACKGROUND: Blood-side dosing methods may overestimate urea removal in comparison to dialysate-side measurements during intermittent HD (IHD) for acute renal failure (ARF). The present study sought to quantify this mass balance error (MBE) and explore potential explanatory factors. METHODS: Prospective, formal, blood-side urea kinetic modelling was performed in serial sessions ...
Tiranathanagul K - - 2008
Measurement of the vascular access flow rate (Q(a)) is a widely accepted method for surveillance and predicting access failure. Among current practical methods, the ultrasound dilution technique is standard, but this requires a costly device available in few hemodialysis (HD) centers. Here, we devised a simple hemoglobin dilution technique to ...
Grouzmann Eric - - 2008
PURPOSE: A misleading blood tacrolimus concentration (BTC) value caused by the contamination of a central venous catheter previously used for tacrolimus administration is described. SUMMARY: A 59-year-old woman with severe chronic obstructive pulmonary disease successfully underwent double lung transplantation. In the intensive care unit, she received a continuous i.v. infusion ...
Watnick Suzanne - - 2008
BACKGROUND AND OBJECTIVES: Previous reports have described white particulate matter in banked blood components, but no prior public reports describe such matter in blood tubing during the course of routine in-center hemodialysis. This report describes the events, investigations, and preliminary conclusions associated with the spontaneous formation of adherent white thrombus ...
Válek Martin - - 2008
AIM: To assess the variability of blood flow (QVA) through a native arteriovenous fistula (AVF) in the long-term and to determine the QVA reduction at which an intervention is appropriate. PATIENTS AND METHODS: The study was performed in a group of 34 chronic hemodialysis patients with no history of a ...
Brummelhuis Walter J - - 2008
Methods to continuously measure absolute refill during dialysis are not available. It would be useful to have such a method because it would allow investigating the mechanism of refill the effect of interventions. We designed a feedback algorithm that adjusts ultrafiltration rate (QUF) according to hemoglobin (Hb) concentration changes in ...
Lee Kyungsoo - - 2008
A new dialysis modality was devised to increase convective mass transfer. Blood and dialysate are circulated by a pulsatile pump, but with pulsatile flow patterns that are 180 degrees out of phase, which causes blood-to-dialysate pressure gradients to oscillate between positive and negative. In the present study, hemodialytic performance of ...
Mandolfo Salvatore - - 2008
In the last few years, the number of hemodialysis patients with inadequate blood flow (Qb) rates has increased due to vascular access problems. To avoid a clinical status of underdialysis, these patients need long-lasting dialysis sessions. However, other factors aimed to optimize the dialysis dose have to be considered. High-efficiency ...
de Freitas Lilyan Walkyria Caleiro - - 2008
AIMS: The use of hemodialysis temporary dual-lumen catheters is often complicated by infections, which may be a significant cause of death among patients with end stage renal disease (ESRD). The aim of this study was to assess the incidence of bacteremia and bacterial colonization related to non-tunneled, non-cuffed, dual-lumen temporary ...
Ishida Hitoshi - - 2008
Recently, expired gases are analyzed non-invasively for monitoring the substances in the blood. Breath ammonia has been shown to correlate with BUN (blood urea nitrogen) and Cr (creatinine), both of which are indicators of solute removal in hemodialysis. In this study, breath ammonia concentration was continuously measured using a crystal ...
Winkler Roland E - - 2008
BACKGROUND: In CKD stage 5 diabetic patients (DM), only approximately half of the interdialytic weight gain was accounted for by sodium intake. The other half was due to pure water gain, probably caused by hyperglycemia. Dialysis treatment faces two major troubles: the removal of the extra amount of water and ...
Grzegorzewska Alicja E - - 2008
OBJECTIVE: The hemodialysis (HD) team should deliver single-pool variable-volume (SPVV) urea Kt/V>or=1.2. At present dialysis machines provide online assessment of Kt/V. The aim of our study is to assess if online Kt/V and SPVV urea Kt/V yield similar values and if it may be replaced in evaluation of HD adequacy. ...
Viganò Sara M - - 2008
The most appropriate dialysate composition is one of the central topics in dialysis treatment. The prescription of a certain dialysate composition could change in order to obtain not only an adequate blood purification but also a high tolerability. Sodium balance represents the cornerstone of cardiovascular stability and good blood pressure ...
Lacson Eduardo E - - 2008
Routine access flow (AF) surveillance is recommended by the Kidney Disease Outcomes Quality Initiative as one of several components for an arteriovenous vascular access maintenance program. A reliable, but affordable, measurement tool is needed for outpatient hemodialysis facilities. Diagnostic test study. 50 adult patients with 27 grafts and 23 fistulas ...
Mora-Bravo Franklin G - - 2008
In hemodialysis, extracorporeal blood flow (Qb) recommendation is 300-500 mL/min. To achieve the best Qb, we based our prescription on dynamic arterial line pressure (DALP). This prospective study included 72 patients with catheter Group 1 (G1), 1877 treatments and 35 arterio-venous (AV) fistulae Group 2 (G2), 1868 treatments. The dialysis ...
Reyns L-M LM Renal Division, Department of Internal Medicine, Ghent University Hospital, Belgium. - - 2008
We describe the case of a 70-year-old woman who presented with a pulsating mass in the left supraclavicular region during a haemodialysis session. The frequency of the pulsations, parallel to that of the dialysis-related blood flow cycle, without blood loss at the exit site, indicated that this observation could potentially ...
Eloot S - - 2008
Several studies have stressed the importance of dialysis time in the removal of uremic retention solutes. To further investigate this, nine stable chronic hemodialysis patients were dialyzed for 4, 6, or 8 h processing the same total blood and dialysate volume by the Genius system and high-flux FX80 dialyzers. Inlet ...
Gura V - - 2008
Ultrafiltration is effective for treating fluid overload, but there are no suitable machines for ambulatory treatment. This study summarizes the use of a light-weight wearable continuous ambulatory ultrafiltration device consisting of a hollow fiber hemofilter, a battery operated pulsatile pump, and two micropumps to control heparin administration and ultrafiltration. Six ...
Schneditz D - - 2007
It is well known that the measurement of access flow by one of the various dilution techniques requires the reversal of blood flow drawn from and returned to the peripheral vascular access. But it was only recently recognized that the line switch itself constitutes a dilution experiment for certain blood ...
Prado Manuel - - 2007
Emerging concepts in renal replacement therapies such as daily hemodialysis (HD) and wearable artificial kidney (WAK) meet the challenges derived from the aging of renal disease population. The successful results of blood recirculation to improve the dialysis clearance of medium-high uremic toxins suggest that this technique could be used both ...
Rafique Zahid - - 2007
Objective: To compare arteriovenous fistula recirculation by thermodilution technique and urea based two needle slow flow method. Design: Comparative cross-sectional study. Place and Duration of Study: Hemodialysis Unit of Nephrology Department of Shaikh Zayed Hospital, Lahore, from October 2005 to December 2005. Patients and Methods: Thirty one patients with end ...
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