Ultrasound elastography has been suggested for assessing organ fibrosis.
To study the feasibility of shear-wave elastography in children with kidney disease and the correlation between elasticity and kidney fibrosis in order to reduce the indications for kidney biopsy and its complications.
Materials and methods
Four operators measured kidney elasticity in children with kidney diseases or transplants, all of whom also had a renal biopsy. We assessed the feasibility and the intraobserver variability of the elasticity measurements for each probe used and each kidney explored. Then we tested the correlation between elasticity measurements and the presence of fibrosis.
Overall, we analyzed 95 children and adolescents, 31 of whom had renal transplant. Measurements with the convex probe were possible in 100% of cases. Linear probe analysis was only possible for 20% of native kidneys and 50% of transplants. Intraobserver variabilities ranged from moderate to high, depending on the probe and kidney studied. Elasticity was higher with the linear probe than with the convex probe (P<0.001 for left kidney and P=0.03 for right kidney). Measurements did not differ from one kidney to another in the same child. Elasticity and fibrosis were both higher in transplant patients (P=0.02 with convex probe; P=0.01 with linear probe; P=0.04 overall). There was no correlation between elasticity and fibrosis.
Of the devices used in this work, kidney elastography was more accurately analyzed with a convex probe. Our study did not identify any correlation between elasticity and kidney fibrosis.
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The study was funded by Assistance Publique Hôpitaux de Marseille (Délégation de la Recherche Clinique et Innovation-Unité Coordination et Contrôle Qualité).
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Desvignes, C., Dabadie, A., Aschero, A. et al. Technical feasibility and correlations between shear-wave elastography and histology in kidney fibrosis in children. Pediatr Radiol 51, 1879–1888 (2021). https://doi.org/10.1007/s00247-021-05068-x
- Shear-wave elastography