Role of Urodynamic Study in Nocturnal Enuresis: Urodynamic Findings and Treatment Outcome Correlation in Children with Pharmacotherapy-resistant Monosymptomatic Nocturnal Enuresis or Severe Non-monosymptomatic Nocturnal Enuresis.

Objectives: This study aimed to determine whether or not a urodynamic study (UDS) is beneficial for management of pediatric nocturnal enuresis (NE), especially in pharmacoresistant monosymptomatic nocturnal enuresis (PRMNE) or severe non-monosymptomatic nocturnal enuresis (NMNE) patients.

Methods: Children with PRMNE or severe NMNE who underwent a UDS for the process of NE treatment were retrospectively reviewed. The UDS findings of patients and treatment outcomes of subsequent tailored therapies according to the UDS findings were analyzed.

Results: A total of 80 children (50 boys and 30 girls, mean age 8.4 ± 2.2 years), 19 of which were diagnosed with PRMNE and 61 of which were diagnosed with NMNE, were included in the final analysis. Of the 19 PRMNE children, 12 (63.2%) demonstrated abnormal UDS findings. Ten demonstrated detrusor overactivity (DO) with or without decreased cystometric bladder capacity (CBC); the treatment outcomes markedly improved in all of the children after anticholinergics were added to the initial desmopressin therapy. Biofeedback was found to be helpful for two children with detrusor-sphincter dyssynergia. All of the total 61 children with NMNE demonstrated abnormal urodynamic findings of DO with or without decreased CBC, and 42 (68.9%) achieved more than partial response (> 50% decrease in the number of wet nights) when given a combination therapy of anticholinergics and desmopressin.

Conclusions: The urodynamic findings were helpful for guiding children with PRMNE in the proper choice of further treatment strategies. A routine UDS should not be recommended prior to a first-line combination treatment in children with NMNE.