Shear wave elastography in the evaluation of renal parenchymal stiffness in patients with chronic kidney disease
Document Type
Article
Publication Date
1-1-2018
Abstract
objective: To investigate the use of shear wave elastography (SWE)-derived estimates of Young's modulus (YM) as an indicator to detect abnormal renal tissue diagnosed by estimated glomerular filtration rate (eGFR). methods: The study comprised 106 chronic kidney disease (CKD) patients and 203 control subjects. Conventional ultrasound was performed to measure the kidney length and cortical thickness. SWE imaging was performed to measure renal parenchymal stiffness. Diagnostic performance of SWE and conventional ultrasound were correlated with serum creatinine, urea levels and eGFR. results: Pearson's correlation coefficient revealed a negative correlation between YM measurements and eGFR (r = −0.576, p < 0.0001). Positive correlations between YM measurements and age (r = 0.321, p < 0.05), serum creatinine (r = 0.375, p < 0.0001) and urea (r = 0.287, p < 0.0001) were also observed. The area under the receiver operating characteristic curve for SWE (0.87) was superior to conventional ultrasound alone (0.35-0.37). The cut-off value of less or equal to 4.31 kPa suggested a non-diseased kidney (80.3% sensitivity, 79.5% specificity). conclusion: SWE was superior to renal length and cortical thickness in detecting CKD. A value of 4.31 kPa or less showed good accuracy in determining whether a kidney was diseased or not.
Keywords
Case-Control Studies, Elasticity Imaging Techniques, Female, Glomerular Filtration Rate, Humans, Kidney, Kidney Cortex, Male, Middle Aged, Reference Values, Renal Insufficiency, Chronic, ROC Curve
Divisions
fac_med
Publication Title
The British Journal of Radiology
Volume
91
Issue
1089
Publisher
British Institute of Radiology