NCT06191731

Kinetics of Urinary Excretion of Gadolinium Contrast Agents Used in MRI Examinations

• Status: Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 60 (estimated)
• Sponsor: Centre Hospitalier Régional Metz-Thionville · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

This is a single-center cohort study aimed to describe the urinary excretion kinetics of gadolinium contrast agents (Gd-CAs). Patients with a prescription for injected MRI are invited to participate in the study. If they agree, blood and urine samples are collected before Gd-CAs injection, and urine samples are collected between 0- and two-and-a-half-hours post-injection of Gd-CAs.

Detailed description

The contrast agents used in MRI to characterize certain lesions contain a chemical element from the rare earth family: Gadolinium (Gd). Gd, in its isolated form, is toxic in humans, but it can still be used in the form of complex molecules such as gadolinium contrast agents (Gd-CAs), which retain its contrast power while greatly minimizing its toxicity. The MRI is performed rapidly after the injection of Gd-CAs, and these compounds are eliminated by the urinary route in the first urine following the examination. After elimination, and in view of their very high stability, these compounds follow the path of wastewater via sewage treatment plants. However, the processes currently used in these plants do not retain them, and they remain present in the purified water discharged into rivers. Work carried out at the Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC) at the University of Lorraine has demonstrated the bioaccumulation of these compounds in freshwater organisms. Gd-CAs then follow the classic pathway of continental waters. It should be noted that the quantity of Gd released as a result of MRI activities has been estimated on average at 1 injection per 1 g of Gd used. In order to prevent future environmental disorders, recovery of all or part of the Gd-CAs immediately after MRI by urine collection is undoubtedly the most effective approach. The aim of this project is to assess the feasibility of such an approach, and to propose a protocol applicable to MRI involving the injection of gadolinium contrast agents for urine collection. This project is part of the "Rare Earths" theme of LabEx R21. It will examine the possibility of recycling gadolinium as an element or as Gd-CAs.

Conditions

• Magnetic Resonance Imaging

Interventions

Type	Name	Description
OTHER	biological samples collection	Urine samples are collected before Gd-CAs injection, and between 0- and two-and-a-half-hour post-injection of Gd-CAs.

Timeline

• Start date: 2024-04-12
• Primary completion: 2026-04-12
• Completion: 2026-04-12
• First posted: 2024-01-05
• Last updated: 2025-03-17

Locations

1 site across 1 country: France