DOI: http://dx.doi.org/10.18203/2349-2902.isj20212274

Renal function estimation done by contrast enhanced computed tomography volume percentage: a better cost-effective alternate for renogram values

Vinothkumar Rajendran, Aquinas Benedict, Ilangovan Murugappan, R. Shankar

Abstract


Background: For optimal management of obstructive uropathy the function of each renoureteral unit needs to be assessed precisely. Usage of nuclear scan for estimation of split renal function has been standard technique till now. Renal parenchymal volume percentage, which is calculated through multislice CT, used as a surrogate marker of split renal function. The aim of the study was to correlate the renal volume percentage calculated from contrast enhanced computed tomography (CECT) of kidney, ureter and bladder (KUB) with split renal function estimated by the gold standard 99mTc-DTPA (diethylene triamine pentaacetic acid) among obstructive uropathy patients.

Methods: Patients who have been diagnosed as chronic unilateral renal obstruction and were requiring 99mTC-DTPA nuclear scan for functional assessment of kidneys were included as our study subjects. A total of 46 patients were taken as our study sample and for all these patients CECT KUB was done and the reports were collected and the renal volume percentage was obtained through those images. Correlation was made between the measurements made by nuclear scan and CECT images in unilateral renal obstruction patients.

Results: A positive linear correlation was obtained between DTPA nuclear scan and CECT images in the detection of renal volume/renal function with r value 0.904 (p<0.05) in obstructive renal units and similarly among non-obstructive renal units the r value was 0.889 (p<0.001).

Conclusions: Though 99mTc-DTPA renal scan is a safest choice by considering its less radiation exposure and no contrast requirement still cost and its universal availability make us to consider CECT as a better alternative.

 


Keywords


Obstructive uropathy, DTPA nuclear scan, CECT, Renal volume, Renal function

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References


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