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CONGRESS OF THE ESPU
08:42–08:45
S20-7 (PP)
THE EFFECTS OF OBESITY ON BLADDER CAPACITY
IN CHILDREN WITH AND WITHOUT LOWER URINARY
TRACT SYMPTOMS
Zhan Tao (peter) WANG, Crystal DORGALLI, Blake SELBY and Antoine KHOURY
Children’s Hospital of Orange Country, University of California, Irvine, Urology, Orange, USA
PURPOSE
Functional bladder capacity is an important factor in the diagnosis of lower urinary tract symptoms
(LUTS) in children. This study examines the effect of obesity on functional bladder capacity and
LUTS.
MATERIAL AND METHODS
Demographic data and voiding diary measurements were prospectively collected, after informed
consent, for children without LUTS. The same data set was then collected retrospectively for chil-
dren with LUTS with ethics approval from the institution. Obesity was defined as children who were
above the 95
th
percentile in weight by age. Statistical comparison was performed using the Student
t-test, where significance was set at p<0.05.
RESULTS
We prospectively screened 110 children without LUTS and enrolled 35. Case-matched controls
were retrospectively identified for 35 children with LUTS (Table 1). The average voided volume
(128 mL versus 222 mL) was significantly less in obese versus non-obese children with LUTS
(p=0.04). In addition, obese children with LUTS had significantly lower average voided volumes,
maximum voided volumes and maximum morning voided volumes compared to obese children
without LUTS (p=0.001, 0.04, 0.001, respectively).
Table 1: Numbers in Study Groups.
Non-Obese No LUTS Obese No LUTS
Non-Obese LUTS
Obese LUTS
18
17
19
16
CONCLUSIONS
Functional bladder capacity is significantly smaller in obese children with LUTS compared to
non-obese children with and without LUTS. Therefore weight counseling should be included in the
management of these children.