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2015 ; 11
(3
): 145.e1-6
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Sonographic assessment of the effect of vesicoureteral reflux and urinary tract
infections on growth of the pediatric solitary kidney
#MMPMID25864614
Ross I
; Ahn HJ
; Roelof B
; Barber T
; Huynh V
; Rockette A
; Popovic M
; Chen JJ
; Steinhardt G
J Pediatr Urol
2015[Jun]; 11
(3
): 145.e1-6
PMID25864614
show ga
INTRODUCTION: Perusal of recent guidelines relating to proper evaluation of
infants and children with urinary tract infection (UTI) suggests that the
occurrence of vesicoureteral reflux (VUR) may not have the clinical import
previously ascribed to this anatomic abnormality. Patients with a solitary kidney
uniquely allow investigation of the effects of both vesicoureteral reflux (VUR)
and urinary tract infection (UTI) on renal growth unencumbered with the
inevitable questions of laterality that confound analysis in patients with two
kidneys. Several previous studies with conflicting results have addressed whether
vesicoureteral reflux (VUR) impacts ultimate renal size in children with a
solitary kidney. Few published studies have considered the occurrence of both
urinary tract infection (UTI) and VUR on the degree of compensatory hypertrophy.
This is the largest series to date investigating the effect of both UTI and VUR
on the degree of compensatory hypertrophy with time. OBJECTIVE: Our objective was
to analyze sonographically determined renal growth in patients with a solitary
kidney, stratifying for both the occurrence and severity of UTIs and the
occurrence and severity of VUR. STUDY DESIGN: We retrospectively reviewed the
clinical history (including bladder and bowel dysfunction (BBD)) and radiology
reports of 145 patients identified as having either a congenital or acquired
solitary kidney in our pediatric urology practice from the prior 10 years. UTIs
were tabulated by severity, where possible, and the grade of VUR was recorded
based on the initial cystogram. Sonographically determined renal length was
tabulated for all ultrasounds obtained throughout the study. Based on a
mixed-effects model, we investigated the influence of UTI and VUR on renal
growth. RESULTS: Of the 145 patients analyzed, 105 had no VUR and 39 had VUR (16
= Gr I&II, 11 = GIII, 12 = GIV&V). Comparison showed that there was no difference
in the occurrence of UTI between those without VUR (27/105 with UTI) and those
with VUR (15/39 with UTI; p = 0.14). There was no difference in the occurrence of
BBD in patients with VUR (15/39) and those without VUR (36/106, p = 0.62). While
neither VUR nor UTI alone affected renal growth in the solitary kidney, the
three-way interaction term among age, VUR, and UTI was significant (p = 0.016).
The growth of the kidneys in the various patient groups is depicted in the table.
From the analysis, a refluxing solitary kidney with UTI showed a significantly
lower growth rate than the other groups (p < 0.001). DISCUSSION: This study is
limited by the inherent selection bias of retrospective studies. Additionally,
the variability of sonographic renal measurement is well recognized. Lastly, our
sample size did not allow us to incorporate the severity of the UTIs and the
grades of VUR in our final regression model. Nevertheless, the overall patterns
suggest that when both VUR and UTI are present, the solitary kidney demonstrates
less renal growth with time. Study of larger cohorts of patients with solitary
kidneys will be necessary to confirm our observations and discern what, if any,
are the consequences of high-grade VUR and upper tract UTI in these patients.
CONCLUSION: In the largest series to date we were able to discern no independent
effect of either VUR or UTI on sonographically determined renal growth in
patients with a solitary kidney. However, UTI and VUR together result in kidneys
that are smaller than other solitary kidneys not so affected. Follow-up studies
of larger cohorts seem warranted to confirm these findings and discern the
clinical import of these smaller kidneys.
|Child
[MESH]
|Child, Preschool
[MESH]
|Female
[MESH]
|Humans
[MESH]
|Hypertrophy
[MESH]
|Kidney/*abnormalities/diagnostic imaging/*growth & development
[MESH]