Usefulness of the classification of urinary dysfunction for the prognosis of the first endoscopic treatment of vesicoureteral reflux in children over the age of 3.

Abstract Objectives To assess the diagnostic performance of urinary dysfunction patterns associated with vesicoureteral reflux (VUR) in children over the age of 3 according to the result of the first endoscopic treatment (ENDT1), grouped into a classification designed by our group (CMD.URI-La Fe). Comparison with other current classifications such as that of Van Batavia et al. Material and methods Ambispective cross-cutting study of a sample of 50 children. Exclusion criteria: previous ENDT, age ≤ 3 years, anatomical or neurological anomalies and a history of ureteral or abdominopelvic surgery. Prior to the ENDT1, a bladder voiding function assessment by uroflowmetry + electromyography (UF-EMG) and post-mictional residue (ultrasound). Other variables from the bladder diary, pre-mictional bladder wall thickness and other clinical variables. The correction of VUR was assessed by isotope cystography 3 months after the treatment. Urinary patterns were classified according to the significant variables (URI-La Fe), and the diagnostic performance of this classification was assessed, comparing it to the classification of patients as proposed by Van Batavia et al. Results Mean age: 6.8 ± 2.28 years. Males/females (44%/56%). Grades of VUR (mild/moderate/severe). ENDT1 VUR correction rate: 77% (n = 38). Diagnostic performance (Van Batavia; URI-La Fe): correct prediction (37.5%; 75%), sensitivity (32.4%; 87.8%), specificity (54.5%; 46.6%), positive predictive value (70.6; 78.3%) and negative predictive value (19.4%; 63.6%). Conclusions Our results show the usefulness of the non-invasive test and the classification of urinary dysfunction in children aged over 3 years prior to the first endoscopic treatment of VUR.