Heparin Leakage by Advective-Diffusive Transport in Central Venous Catheters

2013 ◽  
Author(s):  
Patrick M. McGah ◽  
Michael Barbour ◽  
Alberto Aliseda ◽  
Kenneth W. Gow
Keyword(s):  
Blood Flow ◽  
Kidney Disease ◽  
Central Venous Catheters ◽  
Artificial Kidney ◽  
Diffusive Transport ◽  
End Stage Kidney Disease ◽  
Central Venous ◽  
Increased Risk ◽  
End Stage

Central venous catheters (CVCs) are used as a way to provide adequate access of blood flow for hemodialysis, a common treatment for end-stage kidney disease. During hemodialysis, the catheter must circulate up to 300 mL/min [1] of blood flow to the extracorporeal artificial kidney. Catheters contain two lumens: the inflow lumen provides flow to the artificial kidney, and the outflow lumen returns it to the patient’s circulation. Although catheters are used in the treatment of patients of all ages, this study is motivated by the use of central venous catheters for pediatric applications; the catheter types and calibers available for children are much more limited than for adults, thereby placing children in a further disadvantage and potentially subjecting them to increased risk of complications.

scholarly journals Cerebral blood flow regulation in end-stage kidney disease

2020 ◽  
Vol 319 (5) ◽  
pp. F782-F791
Author(s):  
Justin D. Sprick ◽  
Joe R. Nocera ◽  
Ihab Hajjar ◽  
W. Charles O’Neill ◽  
James Bailey ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Kidney Disease ◽  
Cerebral Oxygenation ◽  
Cerebrovascular Reactivity ◽  
Regulatory Mechanisms ◽  
End Stage Kidney Disease ◽  
Increased Risk ◽  
End Stage

Patients with chronic kidney disease (CKD) and end-stage kidney disease (ESKD) experience an increased risk of cerebrovascular disease and cognitive dysfunction. Hemodialysis (HD), a major modality of renal replacement therapy in ESKD, can cause rapid changes in blood pressure, osmolality, and acid-base balance that collectively present a unique stress to the cerebral vasculature. This review presents an update regarding cerebral blood flow (CBF) regulation in CKD and ESKD and how the maintenance of cerebral oxygenation may be compromised during HD. Patients with ESKD exhibit decreased cerebral oxygen delivery due to anemia, despite cerebral hyperperfusion at rest. Cerebral oxygenation further declines during HD due to reductions in CBF, and this may induce cerebral ischemia or “stunning.” Intradialytic reductions in CBF are driven by decreases in cerebral perfusion pressure that may be partially opposed by bicarbonate shifts during dialysis. Intradialytic reductions in CBF have been related to several variables that are routinely measured in clinical practice including ultrafiltration rate and blood pressure. However, the role of compensatory cerebrovascular regulatory mechanisms during HD remains relatively unexplored. In particular, cerebral autoregulation can oppose reductions in CBF driven by reductions in systemic blood pressure, while cerebrovascular reactivity to CO2 may attenuate intradialytic reductions in CBF through promoting cerebral vasodilation. However, whether these mechanisms are effective in ESKD and during HD remain relatively unexplored. Important areas for future work include investigating potential alterations in cerebrovascular regulation in CKD and ESKD and how key regulatory mechanisms are engaged and integrated during HD to modulate intradialytic declines in CBF.

scholarly journals Cardiopulmonary exercise testing (CPET) in patients with end-stage kidney disease (ESKD): principles, methodology and clinical applications of the optimal tool for exercise tolerance evaluation

2021 ◽  
Author(s):  
Eva Pella ◽  
Afroditi Boutou ◽  
Aristi Boulmpou ◽  
Christodoulos E Papadopoulos ◽  
Aikaterini Papagianni ◽  
...  
Keyword(s):  
Kidney Disease ◽  
Exercise Testing ◽  
Cardiopulmonary Exercise Testing ◽  
Exercise Intolerance ◽  
End Stage Kidney Disease ◽  
Exercise Limitation ◽  
Cardiopulmonary Exercise ◽  
Functional Reserves ◽  
Increased Risk ◽  
End Stage

Abstract Chronic kidney disease (CKD), especially end-stage kidney disease (ESKD), is associated with increased risk for cardiovascular events and all-cause mortality. Exercise intolerance as well as reduced cardiovascular reserve are extremely common in patients with CKD. Cardiopulmonary exercise testing (CPET) is a non-invasive, dynamic technique that provides an integrative evaluation of cardiovascular, pulmonary, neuropsychological and metabolic function during maximal or submaximal exercise, allowing the evaluation of functional reserves of these systems. This assessment is based on the principle that system failure typically occurs when the system is under stress and, thus, CPET is currently considered to be the gold-standard for identifying exercise limitation and differentiating its causes. It has been widely used in several medical fields for risk stratification, clinical evaluation and other applications but its use in everyday practice for CKD patients is scarce. This article describes the basic principles and methodology of CPET and provides an overview of important studies that utilized CPET in patients with ESKD, in an effort to increase awareness of CPET capabilities among practicing nephrologists.

Types of erythropoiesis-stimulating agents and risk of end-stage kidney disease and death in patients with non-dialysis chronic kidney disease

2020 ◽  
Author(s):  
Roberto Minutolo ◽  
Carlo Garofalo ◽  
Paolo Chiodini ◽  
Filippo Aucella ◽  
Lucia Del Vecchio ◽  
...  
Keyword(s):  
Chronic Kidney Disease ◽  
Kidney Disease ◽  
Primary Endpoint ◽  
End Stage Kidney Disease ◽  
Short Acting ◽  
Erythropoiesis Stimulating Agents ◽  
Increased Risk ◽  
Significant Difference ◽  
Long Acting ◽  
End Stage

Abstract Background Despite the widespread use of erythropoiesis-stimulating agents (ESAs) to treat anaemia, the risk of adverse outcomes associated with the use of different types of ESAs in non-dialysis chronic kidney disease (CKD) is poorly investigated. Methods From a pooled cohort of four observational studies, we selected CKD patients receiving short-acting (epoetin α/β; n = 299) or long-acting ESAs (darbepoetin and methoxy polyethylene glycol-epoetin β; n = 403). The primary composite endpoint was end-stage kidney disease (ESKD; dialysis or transplantation) or all-cause death. Multivariable Cox models were used to estimate the relative risk of the primary endpoint between short- and long-acting ESA users. Results During follow-up [median 3.6 years (interquartile range 2.1–6.3)], the primary endpoint was registered in 401 patients [166 (72%) in the short-acting ESA group and 235 (58%) in the long-acting ESA group]. In the highest tertile of short-acting ESA dose, the adjusted risk of primary endpoint was 2-fold higher {hazard ratio [HR] 2.07 [95% confidence interval (CI) 1.37–3.12]} than in the lowest tertile, whereas it did not change across tertiles of dose for long-acting ESA patients. Furthermore, the comparison of ESA type in each tertile of ESA dose disclosed a significant difference only in the highest tertile, where the risk of the primary endpoint was significantly higher in patients receiving short-acting ESAs [HR 1.56 (95% CI 1.09–2.24); P = 0.016]. Results were confirmed when ESA dose was analysed as continuous variable with a significant difference in the primary endpoint between short- and long-acting ESAs for doses >105 IU/kg/week. Conclusions Among non-dialysis CKD patients, the use of a short-acting ESA may be associated with an increased risk of ESKD or death versus long-acting ESAs when higher ESA doses are prescribed.

scholarly journals Vénafalhoz szívósan szervülő centrális vénás hemodialíziskatéter eltávolítása endovascularis technikával

2019 ◽  
Vol 160 (11) ◽  
pp. 435-437 ◽  
Author(s):  
Viktória Juhász ◽  
Edit Dósa ◽  
Zoltán Oláh ◽  
József Szabó ◽  
Zoltán Szeberin
Keyword(s):  
Kidney Disease ◽  
Subclavian Vein ◽  
Vessel Wall ◽  
Catheter Removal ◽  
End Stage Kidney Disease ◽  
Central Venous ◽  
Number Of Patients ◽  
Left Subclavian Vein ◽  
End Stage

Abstract: The number of patients with end-stage kidney disease requiring hemodialysis has been growing. The use of permanent central venous dialysis catheters has been increasing. Catheters in the central veins may adhere strongly to the vessel wall, so their removal may lead to difficulties. A recently published endovascular method (so-called Hong technique) turns the catheter removal to an easy and fast outpatient method and avoids sternotomy. We successfully removed a catheter inserted into the left subclavian vein 6 years ago which was impossible to extract by the usual techniques. Based on our experience, we recommend the routine use of the Hong technique. Orv Hetil. 2019, 160(11): 435–437.

scholarly journals A Validated Prediction Model for End-Stage Kidney Disease in Type 1 Diabetes

2021 ◽  
Author(s):  
Dorte Vistisen ◽  
Gregers S. Andersen ◽  
Adam Hulman ◽  
Stuart J. McGurnaghan ◽  
Helen M. Colhoun ◽  
...  
Keyword(s):  
Type 1 Diabetes ◽  
Kidney Disease ◽  
Prediction Model ◽  
Clinical Decision Making ◽  
External Validation ◽  
End Stage Kidney Disease ◽  
Risk Of Death ◽  
Increased Risk ◽  
End Stage

<b>OBJECTIVE </b> <p>End-stage kidney disease (ESKD) is a life-threatening complication of diabetes which can be prevented or delayed by intervention. Hence, early detection of persons at increased risk is essential.</p> <p> </p> <p><b>RESEARCH DESIGN AND METHODS </b></p> <p>From a population-based cohort of 5,460 clinically diagnosed Danish adults with type 1 diabetes followed 2001-2016, we developed a prediction model for ESKD accounting for the competing risk of death. Poisson regression analysis was used to estimate the model based on information routinely collected from clinical examinations. The effect of including an extended set of predictors (lipids, alcohol intake etc.) was further evaluated, and potential interactions identified in a survival tree analysis were tested. The final model was externally validated in 9,175 adults from Denmark and Scotland.</p> <p> </p> <p><b>RESULTS</b> </p> <p>During a median follow-up of 10.4 years (interquartile limits: 5.1;14.7), 303 (5.5%) of the participants (mean (SD) age 42.3 (16.5) years) developed ESKD and 764 (14.0%) died without having developed ESKD. The final ESKD prediction model included age, male sex, diabetes duration, estimated glomerular filtration rate, micro- and macroalbuminuria, systolic blood pressure, HbA<sub>1c</sub>, smoking and previous cardiovascular disease. Discrimination was excellent for 5-year risk of ESKD event with a C-statistic of 0.888 (95%CI: 0.849;0.927) in the derivation cohort and confirmed at 0.865 (0.811;0.919) and 0.961 (0.940;0.981) in the external validation cohorts from Denmark and Scotland. </p> <p> </p> <p><b>CONCLUSIONS</b> </p> <p>We have derived and validated a novel, high-performing ESKD prediction model for risk stratification in the adult type 1 diabetes population. This model may improve clinical decision making and potentially guide early intervention.</p>

scholarly journals Nonlinear Stability Analysis for Artificial Kidney Multi-compartmental Models

2020 ◽  
Author(s):  
Rammah Abohtyra ◽  
CV Hollot ◽  
J Horowitz ◽  
Yossi Chait
Keyword(s):  
Stability Analysis ◽  
Kidney Disease ◽  
Global Stability ◽  
Dry Weight ◽  
Artificial Kidney ◽  
End Stage Kidney Disease ◽  
Dialysis Therapy ◽  
Compartment Models ◽  
End Stage ◽  
And Behavior

AbstractThis paper addresses a new global stability analysis for a class of nonlinear multi-compartment models. The stability analysis is applied to a specific physiological two-compartment model used in dialysis therapy in end-stage kidney disease patients. Dialysis is a life-sustaining treatment in which an artificial kidney is used to correct acid-base derangement and remove fluid accumulation by ultrafiltration to obtain dry weight (normal weight without extra fluid). Our stability analysis is motivated by the current emphases on improving the assessment of dry weight and strategies for optimal fluid removal in end-stage kidney disease patients. To gain physiological insights into fluid management during the short time (3-5hrs) of the dialysis therapy, we use this model to examine and analyze the solution’s boundedness and behavior under ultrafiltration.In this paper we developed global stability results for a class of nonlinear multi-compartment models, which applies to our specific model used in dialysis therapy. The boundedness and behavior of the solution of our model during dialysis therapy is illustrated under ultrafiltration. We tested our results using both standard ultrafiltration and patient-specific ultrafiltration profiles.

scholarly journals Epidemiological characteristics of cancers in patients with end-stage kidney disease: a Korean nationwide study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Min-Jeong Lee ◽  
Eunyoung Lee ◽  
Bumhee Park ◽  
Inwhee Park
Keyword(s):  
Peritoneal Dialysis ◽  
Kidney Disease ◽  
Kidney Transplant ◽  
End Stage Kidney Disease ◽  
Screening Guidelines ◽  
Tract Cancer ◽  
Increased Risk ◽  
End Stage ◽  
Epidemiological Characteristics ◽  
Risk Of Cancer

AbstractPatients with end-stage kidney disease (ESKD) have been reported to have an increased risk of cancer. However, the epidemiological characteristics of cancer in ESKD patients remain unclear. Therefore, this study aimed to investigate the epidemiological characteristics of cancer in ESKD patients and the differences based on the renal replacement therapy provided. Data on ESKD patients were obtained from the South Korean nationwide cohort Health Insurance Review and Assessment Service database. This study included 58,831 eligible patients of the total 813,907 patients diagnosed with ESKD between January 1, 2007 and December 31, 2017. Of the 58,831 ESKD patients, 3292 (5.6%) were newly diagnosed with cancer. The average duration between the diagnosis of ESKD and cancer was 3.3 ± 1.9 years (mean ± standard deviation), with no differences between hemodialysis, peritoneal dialysis, and kidney transplant groups. The most commonly observed cancer sites in ESKD patients were the colorectum, lung, and liver. The incidence of cancer increased progressively among patients undergoing kidney transplant, peritoneal dialysis, and hemodialysis in that order. Hemodialysis patients were found to have an increased risk of digestive tract cancer compared with kidney transplant patients (adjusted hazard ratio = 1.9; 95% confidence interval: 1.31–2.81; P < 0.001). The study findings may be a useful reference for cancer-screening guidelines.

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