Dialysis Weaning in Intensive Care Units (Dialysis STOP)

Study Overview
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Brief Summary
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Evaluation of daily urinary urea excretion, to guide Renal Replacement Therapy weaning, in Intensive Care Units. The objective is to show that remove the dialysis catheter, once daily urinary urea excretion is greater than 1.35 mmol/kg/d, would increase more than 3 days the number without dialysis catheters, and thus without dialysis, the first 28 days after insertion. Daily urinary urea excretion = urea (mmol/L) x diuresis (L/d) / weight (kg).

Detailed Description
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Daily urinary excretion of urea may provide a safe and reproducible renal replacement therapy withdrawal criterion, according to a recent French study (citations). A rate greater than 1.35 mmol/kg/d would predict a weaning success of 97.1% at 1 week. This criterion is influenced by the use of diuretics, and is easily accessible and achievable. Daily urinary urea excretion is representative of the recovery of renal function. The French study establishing this new withdrawal criterion was monocentric and retrospective. However, we changed our practices as soon as we became aware of them. French multicentric (Bordeaux University Hospital, Libourne, Pau and Bayonne Hospitals) study, before and after: Period before: patients who were dialysed in the intensive care units of Bordeaux, Libourne, Pau and Bayonne, from November 2013 to November 2015. Period after: patients selected prospectively in the 4 hospitals. When diuresis > 100 ml/d, an urinary ionogram is realized daily. Measurement of urinary urea excretion every day. Ablation of the catheter as soon as daily urinary urinary excretion > 1.35 mmol/kg/d. Measurement of daily urinary excretion the following 3 days.

Official Title
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Daily Urinary Urea Excretion to Guide Renal Replacement Therapy Weaning in Intensive Care Units

Conditions
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Acute Kidney Injury

Intervention / Treatment
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* Other: Use of daily urinary urea excretion


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All patients > 18 of age, who have a Renal Replacement Therapy, in intensive care unit, with a diuresis > 100 ml/d. Exclusion Criteria: Patients still presenting hard criteria for RRT: metabolic acidosis with pH < 7.15 and PCO2 <50mmHg; acute pulmonary edema (> 5l 02 or 50% FiO2 for Sp02 > 95%) objectified by echocardiography; K> 5.5 mmol/l after treatment Renal transplantation Long-term chronic kidney injury or short-term dialysis project (arteriovenous fistula created). Acute Kidney Injury secondary to thrombotic microangiopathy Acute Kidney Injury secondary to an obstacle even if dialysed RRT started for toxic cause without IRA (lithium,...)

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| the group BEFORE<br>Retrospective group. The daily urinary urea excretion was unknown. | |
| the group AFTER<br>Prospective group. Use the daily urinary urea excretion to guide the renal replacement therapy weaning. | Other: Use of daily urinary urea excretion<br>* Weaning dialysis catheter<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| the catheter free days | days | the first 28 days after catheter insertion | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| new dialysis catheter and new renal replacement therapy | number | the first 7 days after dialysis catheter ablation | 
| number of dialysis catheter laid per patients | median | the first 28 days after catheter insertion | 
| Duration of renal replacement therapy | days | the first 28 days after catheter insertion | 
| Renal therapy replacement complications (hemorrhage, heparin-induced thrombocytopenia, other) | number | the first 28 days after catheter insertion | 
| Dialysis catheters infections | number | the first 28 days after catheter insertion | 
| Duration of ICU stay | days | the first 28 days after catheter insertion | 
| Duration of mechanical ventilation | days | the first 28 days after catheter insertion | 
| Mortality at at day 28 | number | the first 28 days after catheter insertion |