The maximum detrusor pressure as a predictive factor of success after sphincterotomy in detrusor-sphincter dyssynergia.

Aims: To evaluate the impact of the pre-operative maximum detrusor pressure (MDP) on efficacy outcomes after incontinentation by sphincterotomy or urethral stent placement in male patients with neurogenic detrusor-sphincter dyssynergia (DSD).

Methods: A retrospective study was performed in 41 male patients treated between 2006 and 2013 in a tertiary reference center. All patients had a neurogenic DSD confirmed by baseline urodynamic studies, and were unable or secondary failed to practice CISC. Success was defined as a post-void residual volume <150 mL. Influence of MDP on treatment efficacy was evaluated through a Mann-Whitney U-Test.

Results: Median (range) age was 39 years (20-69). Spinal cord injury was the main underlying condition. Twenty-six patients had a sphincteric stent placement (Memocath®, Bard, Covington) and 15 had surgical sphincterotomy. Treatment was successful in 31 patients (76%). Patients with immediate successful outcomes had a significantly higher mean preoperative MDP (59.6 vs 29.7 cmH O; P = 0.002). Patients with MDP over the threshold of 40 cmH O had a 90% success rate. These differences were maintained at 6 months, MDP being higher in the success group than in the failure group (59.5 vs 39.8 cmH O, respectively, P = 0.008). The technique used (stent placement or incision) had no impact on immediate or 6-month success rates.

Conclusions: Our results suggested that MDP is associated with treatment success rate after surgical management of DSD of neurogenic origin by sphincteric stent placement or surgical sphincterotomy. A threshold of 40 mH O is associated with higher success rates.