Designing a Bayesian Model of the Plasma Clearance of Calcium Edetate de Sodium for the Calculation of GFR and Validity Compared to the Renal Clearance of Inulin

Study Overview
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Brief Summary
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Diagnosis of patients with renal insufficiency and recommendations for medical treatment of patients who suffer from chronic renal failure are based on the different stages of Glomerular Filtration Rate (GFR). Many formulas exist to assess GFR. However these formulas are unreliable in many clinical situations (old people, obese patients…). Methods for measuring GFR using exogenous tracers exist: Inulin and 51Cr-EDTA are historical reference tracers. Renal clearance of Inulin is the gold standard. However, using these methods is restricted to specialized services because it is long and expensive. There is no medical data for the use of Calcium edetate de sodium as a tracer to assess GFR. Calcium edetate de sodium is a treatment for lead intoxication. The extension of use as a tracer comes from its exclusive elimination by glomerular filtration. Plasma and renal clearance of Calcium edetate de sodium and Inulin will be measured for every included patient during a hospital day care (First visit V1). For transplanted patients, plasma clearance of Calcium edetate de sodium will be repeated within one week (more or less 48hours) during annual medical check-up of renal transplantation (Second visit V2).

Official Title
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Designing a Bayesian Model of the Plasma Clearance of Calcium Edetate de Sodium, With a Limited Sampling Strategy for the Calculation of Glomerular Filtration Rate (GFR) and Validity Assessment Compared to the Renal Clearance of Inulin : DFGBay

Conditions
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Kidney Disease

Intervention / Treatment
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* Drug: Dosage of Calcium edetate de sodium


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Inclusion criteria for V1: For transplanted patients : patients from 18 to 80 years, after estimation of their renal function by MDRDs formulas (MDRD = Modification of Diet in Renal Disease) , regardless their nephropathy, regardless the age of the transplantation, with a normal state body hydratation, with a social insurance and who have given their prior consent. For other patients : patients from 18 to 80 years, after estimation of their renal function by MDRDs formulas, who need a reliable assess of their renal function, with a normal state body hydratation, with a social insurance and who have given their prior consent. Inclusion criteria for V2: Transplanted patients who have participated to V1, with stable clinical conditions, with a stable GFR (less than 30% variation of creatinine clearance by MDRDs formulas) and who have given their prior consent. Exclusion Criteria: Hypersensitivity to Calcium edetate de sodium Inulin or excipients Lead or other heavy metal intoxication Volume expansion or dehydration Acute renal disease Bladder voiding affections Coagulation disorders Poor venous capital People in guardianship Patients already involved in an other research Women in child bearing age without any method of contraception Pregnant or lactating women.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 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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Design Details

Primary Purpose: Diagnostic
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Calcium edetate de sodium versus inulin<br>The designing a Bayesian model of the plasma clearance of Calcium edetate de sodium is compared to the renal clearance of Inulin. | Drug: Dosage of Calcium edetate de sodium<br>* There is no medical data for the use of Calcium edetate de sodium as a tracer to assess GFR. Calcium edetate de sodium is a treatment for lead intoxication. The extension of use as a tracer comes from its exclusive elimination by glomerular filtration. Plasma and renal clearance of Calcium edetate de sodium and Inulin will be measured for every included patient during a hospital day care (V1). For transplanted patients, plasma clearance of Calcium edetate de sodium will be repeated within one week (more or less 48hours) during annual medical check-up of renal transplantation.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| To estimate the DFG by the Bayesian model | the DFG assessed by the Bayesian model of the plasma clearance of Calcium edetate de sodium. | 1 week | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Concordance of GFRBay | Concordance of the Bayesian model of GFR measured during V1 and during V2 to determine the reliability of the method | 1 week | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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GFR, Bayesian model, plasma clearance, Calcium edetate de sodium, Inulin