Abstract
Background
Vesicoureteral reflux (VUR) is a frequent cause of chronic kidney disease (CKD) in children. Using blood oxygenation level-dependent magnetic resonance imaging (BOLD-MRI), we measured cortical and medullary oxygenation in children with CKD due to VUR and compared the results to those obtained on healthy controls.
Method
The study population comprised 37 children (19 with CKD due to VUR and 18 healthy age-matched controls). BOLD-MRI was performed before and after furosemide treatment. MR images were analyzed with the region-of-interest (ROI) technique to assess the mean R2* values (=1/T2*) of the cortex and medulla of each kidney and with the concentric object (CO) technique that divides renal parenchyma in 12 equal layers.
Results
R2* values were significantly lower (corresponding to higher oxygenation) in the cortex and medulla of kidneys of children with CKD due to VUR than in those of the healthy controls (cortex 16.4 ± 1.4 vs. 17.2 ± 1.6 s−1 , respectively; medulla 28.4 ± 3.2 vs. 30.3 ± 1.9 s−1 , respectively; P < 0.05), and furosemide-induced changes in medullary R2* were smaller in the former than in the latter (−5.7 ± 3.0 vs. −6.9 ± 3.4 s−1, respectively; P < 0.05). Similar results were found with the CO technique. In children with a history of unilateral reflux (n = 9), the non-affected contralateral kidneys presented similar R2* values as the diseased kidneys, but their response to furosemide was significantly larger (−7.4 ± 3.2 vs. −5.7 ± 3.0, respectively; P = 0.05).
Conclusions
Chronic kidney disease due to VUR is not associated with kidney tissue hypoxia in children. The significantly larger furosemide-induced decrease in medullary R2* levels in the healthy group and unaffected contralateral kidneys of the VUR group points towards more intense renal sodium transport in these kidneys.
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This research project was approved by the local institutional review committee (Ethical Committee of Canton de Vaud, Switzerland) and conducted according to the principles expressed in the Declaration of Helsinki. Written informed consent was obtained from each participant and parents.
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This study was supported by a grant from the Swiss National Science Foundation (FN 32003B-149309).
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Chehade, H., Milani, B., Ansaloni, A. et al. Renal tissue oxygenation in children with chronic kidney disease due to vesicoureteral reflux. Pediatr Nephrol 31, 2103–2111 (2016). https://doi.org/10.1007/s00467-016-3419-0
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DOI: https://doi.org/10.1007/s00467-016-3419-0