Is the mode of occurrence of vesicoureteral reflux correlated to bladder function and spontaneous resolution?
OBJECTIVE
To investigate whether mode of occurrence of vesicoureteral reflux (VUR), during micturition (M), during filling without increase in pressure (passive, P) or in response to an overactive contraction (OA), can be explained by differences in bladder function. Also, to study if the mode of occurrence of VUR can predict spontaneous resolution.


METHODS
There were 93 infants (68 boys and 25 girls) with VUR (grade III-V) included. Videocystometry was performed at median ages 5, 22 and 32 months registering grade and mode of reflux and bladder function characteristics.


RESULTS
Mode of occurrence of reflux changed with age. During infancy P, OA and M reflux comprised almost equal parts. At follow up, P reflux had increased and both OA and M reflux had decreased. This was partly due to a significantly higher probability of spontaneous resolution for M than P reflux, at 40 months (42 vs 18%). P and M reflux were significantly correlated to bladder function characteristics. P reflux was seen in children with high bladder capacity and occurred early in filling. Other predictors were higher age within the respective group and female sex. M reflux was correlated to lack of residual urine, low bladder capacity and absence of overactivity. Other indicators were male sex and low-grade reflux.


CONCLUSIONS
P and M reflux correlate to different bladder patterns: P with high bladder capacity and M with low bladder capacity and without signs of bladder dysfunction. M seems to be benign with a higher resolution rate.
Wahll
Louise
L
Pediatric Uro-Nephrological Centre, Queen Silvia Children's Hospital, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
Bachelard
Marc
M
Sjöström
Sofia
S
Sillén
Ulla
U
D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D053208:Kaplan-Meier Estimate; D016015:Logistic Models; D008297:Male; D011237:Predictive Value of Tests; D011312:Pressure; D011446:Prospective Studies; D012372:ROC Curve; D012075:Remission, Spontaneous; D001743:Urinary Bladder / Q000502:physiology*; D053201:Urinary Bladder, Overactive / Q000175:diagnosis / Q000503:physiopathology*; D014554:Urination / Q000502:physiology*; D014563:Urodynamics / Q000502:physiology*; D014718:Vesico-Ureteral Reflux / Q000175:diagnosis / Q000503:physiopathology*