Transition to adulthood with a bladder augmentation: histopathologic concerns

Long-term complications and outcomes of augmentation cystoplasty in children with neurogenic bladder

Augmentation cystoplasty (AC) is an effective surgical procedure for patients with neurogenic bladder whenever conservative treatments have failed. The present study aimed to determine the risks of metabolic complications, malignancy, long-term outcomes and histopathologic changes of native bladder and the augmented intestine after AC in children with neurogenic bladder. Pediatric patients < 18 years who underwent AC between 2000 and 2020 were enrolled. Early postoperative complications, long-term outcomes and histopathologic changes in mucosal biopsies of native bladder and the augmented intestine after AC were reviewed. Twenty-two patients with a mean age of 7.6 ± 4.4 years were included. The ileum was used in 19 patients and the sigmoid colon in 3 patients. The length of hospital stay was 14.8 ± 6.8 days. Post-operatively, the urinary continence rate improved from 22.7 to 81.8% (p < 0.001). Hydronephrosis resolved in 17 of 19 patients. Vesicoureteral reflux resolved in 16 (64.0%) of the refluxing ureter units and was downgraded in 7 (28.0%). Grades of hydronephrosis and reflux significantly improved following AC (p < 0.001). The estimated glomerular filtration rate also significantly increased (p = 0.012). Formation of urinary tract stones was the most frequent late complication (in 8 patients, 36.4%). Life-threatening spontaneous bladder perforation occurred in 1 patient. After a mean follow-up of 13.4 ± 5.9 years, there were no cases of mortality, new-onset symptomatic metabolic acidosis, or changes in serum electrolytes. Of the 17 patients who were followed for > 10 years, no cases of malignancy or metaplastic changes were identified in the native bladder or augmented bowel epithelium. AC is a safe and effective procedure with low surgical and metabolic complication rates. In addition, AC provides a satisfactory continence rate and long-term protection of renal function, increases functional capacity, and regresses reflux and hydronephrosis. Individualized surveillance is recommended for the early identification of urolithiasis and metabolic disturbances.

Augmentation cystoplasty in the patient with neurogenic bladder

PURPOSE

To review the indications and techniques of augmentation cystoplasty (AC) in patients with neurogenic bladder (NGB) while also examining the long-term outcomes, complications, and follow-up surgeries.

METHODS

PubMed/MEDLINE, Cochrane Library, and Embase databases were searched for articles related to AC and NGB.

RESULTS

AC is indicated for an overactive or poorly compliant bladder refractory to conservative therapies, such as anticholinergic medications and bladder botulinum toxin injections. A variety of surgical techniques using gastrointestinal segments, alternative tissues, and synthetic materials have been described, though bowel remains the most durable. Ileocystoplasty is the most common type of AC, which uses a detubularized patch of ileum that is anastomosed to a bivalved bladder. Some patients undergo concomitant surgeries at the time of AC, such as catheterizable channel creation to aid with clean intermittent catheterization, ureteral reimplantation to treat vesicoureteral reflux, and bladder outlet procedure to treat incontinence. Following AC, the majority of patients experience an improvement in bladder capacity, compliance, and continence. Most patients also experience an improvement in quality of life. AC has significant complications, such as chronic UTIs, bladder and renal calculi, metabolic disturbances, bowel problems, perforation, and malignancy. AC also has a high rate of follow-up surgeries, especially if the patient undergoes concomitant creation of a catheterizable channel.

CONCLUSIONS

Enterocystoplasty remains the gold standard for AC, though more research is needed to better evaluate the morbidity of different surgical techniques and the indications for concomitant surgeries. Experimental methods of AC with tissue engineering are a promising area for further investigation.