Detrusor myectomy: Long-term functional outcomes

Objectives: Detrusor myectomy is a recognized method of bladder augmentation for treating refractory detrusor overactivity. Herein we report the long-term outcomes of this procedure at the University Hospital of Wales in Cardiff, UK. Methods: Detrusor myectomy was carried out in 33 patients (7 males, 26 females) with urodynamically proven detrusor overactivity between 1995 and 2002. The mean patient age was 33 years (range 562). A total of 18 patients had idiopathic detrusor overactivity, whereas 15 had neurogenic detrusor overactivity. Results: A total of 24 patients had a detrusor myectomy alone, whereas eight patients had a detrusor myectomy with implantation of artificial urinary sphincter. One patient had detrusor myectomy with transuretero-ureterostomy. The mean follow up was 148 months (range 108192). A total of 10 of the 18 patients with idiopathic detrusor overactivity (55.5%) and six of the 15 patients with neurogenic detrusor overactivity (40%) showed marked improvement in symptoms. Detrusor overactivity was completely abolished in 11 patients and significantly reduced in five. Postoperatively, mean cystometric capacity improved from 290 to 458 mL, whereas mean maximum amplitude of detrusor contraction was reduced from 44 cm/H2O to 20 cm/H2O. An overall success rate of 48.5% (16/33 patients) was achieved. Intermittent self catheterization was needed to achieve bladder emptying in 12 of the 16 (75%) patients. Of the remaining 17 patients who did not improve, six had CLAM enterocystoplasty carried out and two await the operation. An ileal conduit diversion and suprapubic catheter insertion was carried out in one patient each, whereas seven patients declined any further intervention. Conclusions: Detrusor myectomy offers a reasonable long-term success rate to patients undergoing surgical treatment for refractory detrusor overactivity.