Abstract
Purpose
The production of 51Cr-labelled ethylenediaminetetraacetic acid (51Cr-EDTA), a validated and widely used radio-isotopic tracer for glomerular filtration rate (GFR) measurement in Europe, was recently halted by the manufacturer. Technetium-99m-diethylenetriaminepentaacetic acid (99mTc-DTPA) clearance has so far mostly been restricted to assessment of separate renal function by scintigraphy, but scarcely used and validated for GFR measurement. We compared the performances of 51Cr-EDTA and 99mTc-DTPA for GFR and extracellular fluid measurement.
Methods
In a multi-centre prospective study, 51Cr-EDTA and 99mTc-DTPA were simultaneously injected into 88 patients, and their urinary and plasma clearances, as well as their volumes of distribution, were measured during seven 30-min periods after a 90-min equilibrium time.
Results
Mean age was 52.2 ± 14.5 years, 59% were men. Urinary clearances of 51Cr-EDTA and 99mTc-DTPA were 64.1 ± 27.6 and 66.1 ± 28.0 mL/min, respectively, with a mean bias of 2.00 ± 2.25 mL/min, an accuracy within 10% of 95% [95% CI 91–99], and a coefficient of determination (R2) of 0.994. Plasma clearances of 51Cr-EDTA and 99mTc-DTPA were 66.1 ± 25.8 and 68.1 ± 26.6 mL/min, respectively, with a mean bias of 1.96 ± 3.32 mL/min, an accuracy within 10% of 91% [95% CI 85–97] and a R2 of 0.985. Distribution volumes were 17.3 ± 4.6 L for 51Cr-EDTA and 16.6 ± 4.6 L for 99mTc-DTPA (R2 0.930).
Conclusion
The accuracy and precision of 99mTc-DTPA clearance, compared to 51Cr-EDTA clearance, was excellent for both urinary and plasma clearance methods, despite an approximate 2 mL/min overestimation, showing that the tracer is a reliable alternative to 51Cr-EDTA for GFR measurement.
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The authors declare that they have no financial or non-financial competing interests according to the subject and matter of the presented article. Dr. Balouzet reports non-financial support from Curium, outside the submitted work; Dr. Courbebaisse reports grants from Biohealth (Italy), grants from Advicenne (France), grants from Kyowa Kirin (Japan), and personal fees from Alnylam (France), outside the submitted work; Dr. Rouzet reports personal fees from GE Healthcare and grants from Spectrum Dynamics, outside the submitted work. Other authors have no relevant conflicts of interest to disclose.
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Vidal-Petiot, E., Courbebaisse, M., Livrozet, M. et al. Comparison of 51Cr-EDTA and 99mTc-DTPA for glomerular filtration rate measurement. J Nephrol 34, 729–737 (2021). https://doi.org/10.1007/s40620-020-00932-9
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DOI: https://doi.org/10.1007/s40620-020-00932-9