Abstract
Background
In late 2018, the production of 51Chromium-labelled ethylenediamine tetra-acetic acid (51Cr-EDTA), a validated and widely used radio-isotopic tracer for measuring glomerular filtration rate, was halted. Technetium-99m-diethylenetriaminepentaacetic acid (99mTc-DTPA) has been validated for GFR measurement with a single bolus injection, a procedure not suitable in patients with extracellular compartment hyperhydration. In such cases, a bolus followed by continuous infusion of the tracer is required. The aim of this study was to evaluate whether 99mTc-DTPA with the infusion protocol can replace 51Cr-EDTA for GFR measurement.
Methods
We conducted a prospective single centre study during February and March 2019. All patients referred for GFR measurement received both radiotracers simultaneously: 51Cr-EDTA and 99mTc-DTPA bolus and continuous infusion were administered concomitantly through the same intravenous route. Over four and a half hours, plasma and urine samples were collected to calculate urinary and plasma clearance.
Results
Twenty-two patients were included (mean age 63.4 ± 17.5 years; 68% men). Mean urinary clearance of 51Cr-EDTA and 99mTc-DTPA was 52.4 ± 22.5 mL/min and 52.8 ± 22.6 mL/min, respectively (p = 0.47), with a mean bias of 0.39 ± 2.50 mL/min, an accuracy within 10% of 100% (95% CI 100; 100) and a Pearson correlation coefficient of 0.994. Mean plasma clearance of 51Cr-EDTA and 99mTc-DTPA was 54.8 ± 20.9 mL/min and 54.4 ± 20.9 mL/min, respectively (p = 0.61), with a mean bias of − 0.43 ± 3.89 mL/min, an accuracy within 10% of 77% (95% CI 59; 91) and a Pearson correlation coefficient of 0.983.
Conclusions
Urinary and plasma clearance of 99mTc-DTPA can be used with the infusion protocol to measure GFR.
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Data availability
The data supporting the findings of this study may be shared by the authors upon reasonable request.
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The results presented in this paper have not been published previously in whole or part except in abstract format. The authors have conflict of interest to declare related to this study. Dr. Balouzet reports non-financial support from Curium, outside the submitted work, Pr. Courbebaisse reports grants from Biohealth (Italy), and Advicenne (France), and personal fees from Alnylam (France), outside the submitted work.
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This study was classified as non-interventional by the DRCI (Délégation à la Recherche Clinique et à l’Innovation) of APHP (Assistance Publique—Hôpitaux de Paris).
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The study was approved by our local Ethics Committee (CERAPHP.5, IRB registration #00011928), and for scientific use, all data were anonymized. Research was conducted in accordance with good clinical practices and the Declaration of Helsinki.
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Balouzet, C., Michon-Colin, A., Dupont, L. et al. Comparison of 99mTc-DTPA and 51Cr-EDTA for glomerular filtration rate measurement with the continuous infusion method. J Nephrol 36, 2457–2465 (2023). https://doi.org/10.1007/s40620-023-01612-0
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DOI: https://doi.org/10.1007/s40620-023-01612-0