Prevention of tunneled cuffed catheter dysfunction with prophylactic use of a taurolidine urokinase lock: A randomized double-blind trial.

BACKGROUND: The efficacy and cost-effectiveness of prophylactic thrombolytic locks in hemodialysis patients at high-risk of thrombotic dialysis catheter dysfunction is uncertain. We investigated this question in a double-blinded randomized controlled study. METHODS: Prevalent hemodialysis patients from 8 Belgian hemodialysis units, with ≥2 separate episodes of thrombotic dysfunction of their tunneled cuffed catheter during the 6 months before inclusion, were randomized to either: taurolidine heparin locks thrice weekly (control arm) or the same locks twice a week combined with taurolidine urokinase locks once a week before the longest interval without HD (TaurolockU arm). The primary efficacy outcome was the incidence rate of catheter thrombotic dysfunction requiring thrombolytic locks to restore function. RESULTS: 68 hemodialysis patients (32 controls, 36 urokinase) were followed during 9875 catheter days between May 2015 and June 2017. Incidence rate of thrombotic catheter dysfunction was 4.8 in TaurolockU vs 12.1/1000 catheter days in control group (rate ratio 0.39; 95%CI 0.23-0.64). 15/36 (42%) catheters in the treatment group required at least one therapeutic urokinase lock vs 23/32 (72%) in the control group (P = 0.012). The two groups did not differ significantly in catheter-related bloodstream infection and combined cost of prophylactic and therapeutic catheter locks. The TaurolockU group had a numerically higher number of episodes of refractory thrombosis. CONCLUSIONS: Prophylactic use of urokinase locks is highly effective in reducing the number of thrombotic catheter dysfunctions in catheters with a history of recurring dysfunction. Prophylactic use of urokinase locks did not reduce the overall costs associated with catheter locks and was associated with a numerically higher number of episodes of refractory thrombosis. TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT02036255.

Improving NSAIDs Prescription in Emergency Services Unit by a Point-of-Care-Based Renal Function Evaluation.

BACKGROUND: Patients evaluated in our emergency department (ED) often receive nonsteroidal anti-inflammatory drugs (NSAIDs) without any determination of their renal function, despite the known nephrotoxicity of NSAIDs. Guidelines recommend NSAID avoidance in patients with estimated glomerular filtration rate (eGFR) < 30 mL/min/1.73 m2, and long-lasting therapy is not recommended in people with chronic kidney disease. OBJECTIVE: We aimed to highlight the influence of a rapid measurement of the eGFR on NSAID prescriptions in patients at risk of impaired renal function using a point-of-care (POC) device. Our goal was to prevent the potential nephrotoxicity of NSAIDs by allowing the physicians to modify their treatments after eGFR determination, while avoiding a standard blood test for patients that would extend the duration of stay in the ED. METHODS: We included 192 patients evaluated in the ED for minor trauma or injury, with an indication of treatment with NSAIDs and no known contraindication to NSAIDs. Emergency physicians were asked to register their intention to actually prescribe NSAIDs based on their clinical gestalt with specific regard to kidney function. Immediately after, the creatinine level was measured in capillary blood and eGFR was calculated using the POC device (StatSensor Creatinine; Nova Biomedical, Waltham, MA). Our physicians avoided NSAID prescriptions when eGFR was < 30 mL/min/1.73 m2, and prescribed a shorter NSAID regimen therapy in patient with eGFR < 45 mL/min/1.73 m2, with a reminder to assure hydration. The decision based on eGFR was compared with original clinician intention. RESULTS: The clinicians intended to treat 164 patients with NSAIDs (group 1) and defer NSAIDs in 28 patients (group 2). In the first group, eGFR results supported no change in intended NSAID use in 144 patients, highlighted the need for a short regimen in 17 patients, and indicated contraindication to NSAIDs in 3 patients. In group 2, eGFR determination allowed prescription of NSAIDs in 21 patients, allowed utilization of NSAIDs with a short course in 5 patients, and supported the clinician decision to avoid NSAIDs in 2 patients. CONCLUSIONS: POC measurement of creatinine with eGFR estimation changed the prescription of NSAIDs in almost 25% of patients with previously unknown renal function.

Urokinase-containing locking solution in the prevention of dialysis catheter dysfunction: a double blind randomized controlled trial.

INTRODUCTION: The prophylactic use of recombinant tissue plasminogen activator once weekly reduces the incidence rate of tunneled cuffed catheter (TCC) malfunction and bacteremia as compared to the exclusive use of heparin as locking solution. Restricting the use of prophylactic thrombolytic agents to patients with a history of thrombotic TCC malfunction could be more cost effective. We conduct a multicenter, double-blind, randomized controlled trial and test the hypothesis that weekly use of urokinase lock will reduce the incidence of thrombotic malfunction by 50% in prevalent hemodialysis patients with a history of thrombotic malfunction. METHODS: Patients with a history of at least two separate TCC thrombotic dysfunctions treated with urokinase lock during the 6 months preceding inclusion are recruited in eight Belgian dialysis units. Patients are randomized in two groups: the control group receiving Taurolock™-HEP500 (heparin 500 IU/mL, taurolidine, citrate 4%) after each hemodialysis session and the treatment group receiving Taurolock-U 25,000 (urokinase 25,000, taurolidine, citrate 4%) once a week and the standard Taurolock-HEP500 at the end of the two others sessions. The primary outcome is the incidence rate of TCC thrombotic dysfunction defined by the use of urokinase. The secondary outcomes are the incidence rate of TCC removal and systemic thrombolysis. For the study, both patients and healthcare staff are blinded to treatment allocation. CONCLUSIONS: The present trial is the first to investigate the effect of Taurolock-U 25,000 catheter lock once a week as secondary prevention in hemodialysis patients with the highest risk of TCC-related thrombotic dysfunction. TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT02036255.

Human marrow mesenchymal stem cell culture: serum-free medium allows better expansion than classical alpha-MEM medium.

The expansion of mesenchymal stem cells (MSCs) strongly depends on the culture conditions and requires medium supplemented with 10-20% fetal calf serum (FCS) to generate relevant numbers of cells. However, the presence of FCS is a major obstacle for their clinical use. Therefore, we have evaluated the capacity of expansion of MSC in a commercial serum-free medium (UC) supplemented with a serum substitute (ULTROSER) in comparison with a classical medium alpha-MEM containing 15% FBS. Bone marrow-mononuclear cells collected from 12 volunteer healthy donors were expanded in two different culture media. MSCs isolated in the both media were morphologically similar and expressed identical phenotypic markers. After the primoculture (P0) and one passage, we obtained significantly more MSC and CFU-F progenitors in UC medium than in alphaMEM. Their multipotentiality was preserved during culture, as well as their capacity to support haematopoiesis. In conclusion, our observations strongly suggest that UC is an optimal medium for ex vivo expansion of MSC: it allows a better cell expansion, preserves cell multipotentiality, reduces the culture period and contains low concentration of serum substitute. This medium seems suitable for clinical scale expansion of MSC.