Published in:
01-07-2014 | Correspondence
Bed Wetting—Silent Suffering: An Approach to Enuresis and Voiding Disorders in Children: Authors’ Reply
Published in: Indian Journal of Pediatrics | Issue 7/2014
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To the Editor: We are grateful for your comments and queries related to our article [1].
1.
The normal expected urinary bladder capacity for children varies with age and can be calculated using the formula:-
$$ \left(\mathrm{Age}\ \mathrm{in}\kern0.35em \mathrm{years}+2\right)\times 30\;\mathrm{mL}. $$
This can then be compared to the voided volume. It is considered small if the voided volume is < 65 % for the expected capacity for age [2].
2.
Smaller than expected bladder capacity are desmopressin resistant because the likely etiology in these children is not overproduction of urine. Hence the response to desmopressin is likely to be poor. Nocturnal polyuria is now described in some children with enuresis who respond to desmopressin. Here the overnight urine output is >130 % of expected bladder capacity. Children with smaller than expected bladder capacity do better with anticholinergics. However, in case we can document nocturnal polyuria as well as a reduced bladder capacity the two modalities can be used with synergistic effect [3].