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Development of formulae for accurate measurement of the glomerular filtration rate by renal dynamic imaging.
Nucl Med Commun. 2007 May; 28(5):407-13.NM

Abstract

AIM

Currently, the widely adopted renal dynamic imaging in clinical practice uses Gates' method to calculate the glomerular filtration rate (GFR), but many researchers have proven that Gates' method may result in bias. Thus, this article explores alternative improved formulae to calculate GFR by renal dynamic imaging.

METHODS

Three hundred and sixty-seven patients were selected and their GFR values were measured using renal dynamic imaging and the two-plasma method with 99mTc-diethylenetriaminepentaacetic acid (99mTc-DTPA) as the imaging agent. With the two-plasma GFR as reference value, two equations were obtained from linear and non-linear regression analyses between the renal uptake percentage and two-plasma GFR. The 367 patients were divided into two random groups, with the first group used to derive the regression formulae and the second to verify the formulae. Finally, all patients were studied to derive the formulae to calculate GFR. The comparison of our formulae with the commonly used Gates' formula was conducted by the Bland-Altman method.

RESULTS

The linear and non-linear GFR formulae were as follows: GFR (ml/min/1.73 m2)=(631.633 x renal uptake percentage - 2.040) x 1.73/BSA (BSA, body surface area) and GFR (ml/min/1.73 m2)=(-1996.585 x renal uptake percentage2 + 1013.526 x renal uptake percentage - 12.739) x 1.73/BSA, respectively. The biases of the GFR values calculated using the linear and non-linear formulae and Gates' formula relative to the two-plasma GFR were -2.5 +/- 19.1 ml/min/1.73 m2, -2.0 +/- 19.3 ml/min/1.73 m2 and 3.4 +/- 19.4 ml/min/1.73 m2, respectively.

CONCLUSIONS

The GFR values calculated using our new formulae correlate better with the reference GFR value than does GFR calculated by Gates' formula, and the GFR values measured using the non-linear formula are more accurate than those obtained using the linear formula.

Authors+Show Affiliations

Department of Nuclear Medicine, Peking University First Hospital, Beijing, China. gurguer@163.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17414891

Citation

Li, Qian, et al. "Development of Formulae for Accurate Measurement of the Glomerular Filtration Rate By Renal Dynamic Imaging." Nuclear Medicine Communications, vol. 28, no. 5, 2007, pp. 407-13.
Li Q, Zhang CL, Fu ZL, et al. Development of formulae for accurate measurement of the glomerular filtration rate by renal dynamic imaging. Nucl Med Commun. 2007;28(5):407-13.
Li, Q., Zhang, C. L., Fu, Z. L., Wang, R. F., Ma, Y. C., & Zuo, L. (2007). Development of formulae for accurate measurement of the glomerular filtration rate by renal dynamic imaging. Nuclear Medicine Communications, 28(5), 407-13.
Li Q, et al. Development of Formulae for Accurate Measurement of the Glomerular Filtration Rate By Renal Dynamic Imaging. Nucl Med Commun. 2007;28(5):407-13. PubMed PMID: 17414891.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Development of formulae for accurate measurement of the glomerular filtration rate by renal dynamic imaging. AU - Li,Qian, AU - Zhang,Chun-Li, AU - Fu,Zhan-Li, AU - Wang,Rong-Fu, AU - Ma,Ying-Chun, AU - Zuo,Li, PY - 2007/4/7/pubmed PY - 2007/6/8/medline PY - 2007/4/7/entrez SP - 407 EP - 13 JF - Nuclear medicine communications JO - Nucl Med Commun VL - 28 IS - 5 N2 - AIM: Currently, the widely adopted renal dynamic imaging in clinical practice uses Gates' method to calculate the glomerular filtration rate (GFR), but many researchers have proven that Gates' method may result in bias. Thus, this article explores alternative improved formulae to calculate GFR by renal dynamic imaging. METHODS: Three hundred and sixty-seven patients were selected and their GFR values were measured using renal dynamic imaging and the two-plasma method with 99mTc-diethylenetriaminepentaacetic acid (99mTc-DTPA) as the imaging agent. With the two-plasma GFR as reference value, two equations were obtained from linear and non-linear regression analyses between the renal uptake percentage and two-plasma GFR. The 367 patients were divided into two random groups, with the first group used to derive the regression formulae and the second to verify the formulae. Finally, all patients were studied to derive the formulae to calculate GFR. The comparison of our formulae with the commonly used Gates' formula was conducted by the Bland-Altman method. RESULTS: The linear and non-linear GFR formulae were as follows: GFR (ml/min/1.73 m2)=(631.633 x renal uptake percentage - 2.040) x 1.73/BSA (BSA, body surface area) and GFR (ml/min/1.73 m2)=(-1996.585 x renal uptake percentage2 + 1013.526 x renal uptake percentage - 12.739) x 1.73/BSA, respectively. The biases of the GFR values calculated using the linear and non-linear formulae and Gates' formula relative to the two-plasma GFR were -2.5 +/- 19.1 ml/min/1.73 m2, -2.0 +/- 19.3 ml/min/1.73 m2 and 3.4 +/- 19.4 ml/min/1.73 m2, respectively. CONCLUSIONS: The GFR values calculated using our new formulae correlate better with the reference GFR value than does GFR calculated by Gates' formula, and the GFR values measured using the non-linear formula are more accurate than those obtained using the linear formula. SN - 0143-3636 UR - https://www.unboundmedicine.com/medline/citation/17414891/Development_of_formulae_for_accurate_measurement_of_the_glomerular_filtration_rate_by_renal_dynamic_imaging_ L2 - https://doi.org/10.1097/MNM.0b013e3280a02f8b DB - PRIME DP - Unbound Medicine ER -