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Determinants of Vascular Calcification in Chronic Renal Failure : Impact of Pyrophosphate Levels After Renal Transplantation

NCT03462238 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 19

Last updated 2023-05-06

No results posted yet for this study

Summary

Arterial calcifications (AC) are constant lesions in patients with Chronic Kidney Diseases (CKD). Renal transplantation would reduce their progression compared to dialysis. AC pathophysiology is a complex and finely regulated process that involves many local and systemic factors, both pro- and anti-calcification. The progression of the CKD is accompanied by an increase in phosphate levels as the renal excretion capacity of inorganic phosphates (Pi) decreases while their digestive absorption remains unchanged. Hyperphosphatremia is a well-identified calcifying factor contributing to ACs in the CKD. On the other hand, pyrophosphate (PPi) is an anti-calcifying factor from the hydrolysis of extracellular ATP by ectonucleotidases. While there are many factors that may contribute to a protective effect against AC progression of renal transplantation, no study has been yet analysed the role of PPi. Plasma concentration of PPi is decreased in dialysis patients compared to non-kidney failure patients.

The main objective of this monocentric, prospective and interventional pilot study will be to compare the progression of CA and \[PPi\]pl between a group of renal transplant patients over the past 24 months and a group of dialysis patients over the same period of time. The secondary objectives will be to compare the progression of ACs and the ratio\[PPi\]pl/\[Pi\]pl between transplanted and dialysis patients. Transplanted patients will be included within 24 (±3) months of transplant. Dialysis patients will be included at 24 (±3) months of the CT scan performed during the pre-transplant check-up. At inclusion, all patients will benefit from a CT scan without injection and a plasma dose of PPi, Pi and other factors involved in controlling calcification.

Conditions

  • Chronic Kidney Diseases

Interventions

PROCEDURE

Blood collection for Ppi assay

A 4.5 ml blood sample will be taken with a citrate vacuum tube.

RADIATION

CT Scan

A scanner will be performed

Sponsors & Collaborators

  • Centre Hospitalier Universitaire de Nice

    lead OTHER

Principal Investigators

  • Georges LEFTHERIOTIS, PU-PH · Centre Hospitalier Universitaire de Nice

Study Design

Allocation
NON_RANDOMIZED
Purpose
OTHER
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2018-09-10
Primary Completion
2019-10-28
Completion
2020-10-28

Countries

  • France

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03462238 on ClinicalTrials.gov