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SYMPOSIUM
Year : 2013  |  Volume : 29  |  Issue : 4  |  Page : 322-327
 

Augmentation cystoplasty: Contemporary indications, techniques and complications


Department of Urology, Freeman Hospital, Newcastle Upon Tyne, United Kingdom

Date of Web Publication21-Oct-2013

Correspondence Address:
Chris Harding
Department of Urology, Freeman Hospital, Newcastle Upon Tyne, NE7 7DN
United Kingdom
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-1591.120114

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   Abstract 

Augmentation cystoplasty (AC) has traditionally been used in the treatment of the low capacity, poorly compliant or refractory overactive bladder (OAB). The use of intravesical botulinum toxin and sacral neuromodulation in detrusor overactivity has reduced the number of AC performed for this indication. However, AC remains important in the pediatric and renal transplant setting and still remains a viable option for refractory OAB. Advances in surgical technique have seen the development of both laparoscopic and robotic augmentation cystoplasty. A variety of intestinal segments can be used although ileocystoplasty remains the most common performed procedure. Early complications include thromboembolism and mortality, whereas long-term problems include metabolic disturbance, bacteriuria, urinary tract stones, incontinence, perforation, the need for intermittent self-catheterization and carcinoma. This article examines the contemporary indications, published results and possible future directions for augmentation cystoplasty.


Keywords: Complication, cystoplasty, reconstruction


How to cite this article:
Veeratterapillay R, Thorpe AC, Harding C. Augmentation cystoplasty: Contemporary indications, techniques and complications. Indian J Urol 2013;29:322-7

How to cite this URL:
Veeratterapillay R, Thorpe AC, Harding C. Augmentation cystoplasty: Contemporary indications, techniques and complications. Indian J Urol [serial online] 2013 [cited 2019 Aug 22];29:322-7. Available from: http://www.indianjurol.com/text.asp?2013/29/4/322/120114



   Introduction Top


Augmentation cystoplasty (AC) has been used in adult patients for the treatment of the low capacity, poorly compliant or refractory overactive bladder (OAB). In addition, in the pediatric population, it is an invaluable technique for lower urinary tract reconstruction following congenital urological anomalies for example bladder exstrophy. In principle, it involves the use of bowel segments to increase bladder capacity, thereby protecting the upper tract whilst allowing patients to be continent and improving their symptoms. [1]

Whilst traditionally, AC has been used in the context of OAB management, the past two decades have seen the rise of anticholinergic medications for OAB, intravesical botulinum toxin and more recently sacral neuromodulation. [2],[3],[4] Those interventions have proved to be safe and effective and are appealing both to patients and doctors. They have therefore reduced the need for AC and certainly in the UK setting, there has been a reduction in the number of AC procedures over the past decade. [1] In addition, 5 years cost analysis appears to favor botulinum toxin compared to AC in refractory detrusor overactivity. [5]

In this review, we re-examine the contemporary indications, technical updates and future of AC.


   Current Indications for AC Top


AC remains an option, with high patient satisfaction rates, in neurogenic and non-neurogenic bladder dysfunction when conservative management, pharmacological methods and minimally invasive treatments have been unsuccessful and exhausted. [6],[7] Patients with detrusor overactivity would initially undergo conservative measures with the addition of anticholinergic medications. If these are unsuccessful, the next step would be a trial of intravesical botulinum toxin medications or sacral neuromodulation. Patients who fail treatment with all those modalities are then considered for augmentation cystoplasty. In refractory neurogenic bladder dysfunction, Khastgir et al. (2003) found high satisfaction rates, in addition to successful surgical outcomes (increase in bladder capacity, reduction in detrusor pressure and resolution of concurrent reflux), in 32 spinal cord injured patients following augmentation cystoplasty and Zachoval et al. (2003) reported similar outcomes in patients with multiple sclerosis. [8],[9] The literature reveals a satisfactory outcome from AC (as measured by post-operative symptom scores or urodynamic parameters of bladder capacity, detrusor compliance and emptying) in up to 88% of patients with a variable clean intermittent self-catheterization rate (ISC) of 10-75%. [10],[11],[12],[13],[14]

AC also retains a role in the management of infective and inflammatory bladder disorders, which lead to a low capacity and poorly compliant bladder. Such conditions include post-radiotherapy cystitis, cystitis following intravesical or systemic chemotherapy, schistosomiasis, tuberculosis and interstitial cystitis. [10],[11] In interstitial cystitis/bladder pain syndrome, studies have been limited by small patient numbers and results have been variable. [12],[13],[14] The best results are seen in patients with interstitial cystitis who have Hunner's ulcers where complete pain relief is seen in 63%, but it is well-reported that patients may get a recurrence of pain in the augmented bladder. [12],[13],[14] There have been few recent reports on AC in radiotherapy patients, but traditional studies have estimated the success rate at about 70%. [15],[16]

In the pediatric population in congenital bladder anomalies (bladder exstrophy, epispadias, posterior urethral valves), AC achieves an increase in bladder capacity and reduces upper tract complications. [17],[18],[19]

In the setting of renal transplantation, AC is considered to be better than ileal conduit urinary diversion in a recipient with associated lower-urinary tract dysfunction with a lower complication rate. [20],[21] AC can be performed before, after or at the time of transplantation with little evidence of difference in graft survival or febrile episodes between each technique. [22],[23]


   Surgical Perspective and Techniques Top


Ileocystoplasty is the most common bladder augmentation procedure. Mikulicz initially described augmentation ileocystoplasty in humans in 1889. [24] The technique gained acceptance in the 1950s for the management of tuberculous bladders and was further popularized by Bramble in the 1980s in conjunction with ISC. [6] Several other gastro-intestinal segments have been used in augmentation including stomach, cecum, ascending and sigmoid colon. [1],[25] The selection of an intestinal segment for augmentation needs to be given some thought: small bowel is the segment of choice for the majority of surgeons due to its ease of handling; however, post pelvic radiotherapy, this may not be suitable as the bowel is often in the irradiated field and as such a colonic conduit might be preferable. Similar considerations apply in patients undergoing redo - procedures. Gastic segments for augmentation were once popular especially in the pediatric population, but have fallen out of favor due to higher risk of complications. [1],[25],[26],[27]

Open technique

AC has traditionally been performed via an open approach with sagittal bivalving of the bladder and anastomosis of the bowel segment onto the native bladder [Figure 1]. [1],[6] The most widely used bowel segment for AC is a detubularized patch of ileum, usually taken about 25-40 cm from the ileocecal valve. [6],[26] If cecum is used, it is often used in conjunction with the terminal ileum as an ileocaecocystoplasty. [27] Alternatives to using gastrointestinal tissue have been auto-augmentation (detrusor myomectomy) where detrusor muscle is stripped from the bladder with an overall success of 50-70% [28] or ureterocystoplasty using a pre-existing dilated ureter, but up to 24% of those require revision surgery. [29],[30] Advances in surgical technique have seen laparoscopic gastrocystoplasty and ileocystoplasty [31] and more recently robotic augmentation ileocystoplasty being performed. [32]
Figure 1: (a) Bivalving of bladder, (b) Anastomosis of detubularized ileal patch

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Laparoscopic and robotic approach

Laparoscopic enterocystoplasty was first described by Gill et al. (2000) in a series of three patients with small capacity neurogenic bladders who underwent laparoscopic ileocystoplasty, sigmoidocystoplasty and cystoplasty with cecum and proximal ascending colon. After the creation of a veress needle pneumoperitoneum, a four-port transperitoneal laparoscopic approach was used and an appropriate 15-cm length of bowel was identified. The distal end of the selected bowel segment was marked with a superficial electrocautery burn for identification. After desufflation, the preselected loop of the bowel was delivered outside the abdomen through a 2-cm extension of the umbilical port incision. Using open technique, the appropriate bowel segment with its mesenteric pedicle was isolated, bowel continuity was re-established and the isolated bowel segment was detubularized along its antimesenteric border. An orientation suture was placed at the cephalad end and at the caudal end of the bowel patch to facilitate subsequent laparoscopic identification. The bowel was then returned to the abdominal cavity. An anteroposterior cystotomy incision was created laparoscopically using electrosurgical scissors. Circumferential, continuous, full-thickness, single-layer anastomosis of the bowel mucosa and muscularis with the bladder wall was then created by laparoscopic suturing. [31] A similar surgical approach is used for robot-assisted enterocystoplasty. The robot-assisted laparoscopic operation has merits such as a device with seven degrees of freedom, high-resolution, three-dimensional pictures, direct-view movement and removal of hand shaking, which facilitate intracorporeal dissection and suturing. [32] Those minimally invasive procedures are feasible and efficaciously duplicate the established principles of open enterocystoplasty while minimizing operative morbidity, expediting convalescence and enhancing cosmesis. [31],[32] They are however associated with increased operative time.


   Complications Top


AC is a major abdominal operation and hence a variety of early and late complications have been described in the literature. Early complications include thromboembolism and mortality whereas long-term problems include metabolic disturbance, bacteriuria, urinary tract stones, incontinence, perforation, incontinence and carcinoma [Table 1] [8],[17],[18],[41],[50],[51],[52] [Table 2].
Table 1: Contemporary augmentation cystoplasty series and complications[8,17,18,41,50-52]

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Table 2: indications and complications of intestinal segments

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Thromboembolism, cardiovascular and gastrointestinal complications

Early complications of AC include cardiovascular, thrombo-embolic, respiratory and gastrointestinal complications associated with any major abdominal procedure. [33] The post-operative myocardial infarction rate was up to 2.7% and the incidence of deep vein thrombosis/pulmonary embolism was as high as 7.1% in an early series of 185 patients highlighting the need for adequate thromboprophylaxis. [16],[34] The mortality rate from AC is reported to be between 0% and 2.7% with a re-operation rate for bleeding of up to 3.2%, [35] small bowel obstruction of up to 5.7% [34] and wound infection of up to 7.1%. [27]

Metabolic acidosis, calcium balance and hypokalemia in ileo-and colo-cystoplasty

Perhaps the most well-known long-term complication of AC is the metabolic disturbance characterized by hyperchloremic acidosis. This is the result of re-absorption of ammonium and ammonium chloride and the secretion of bicarbonate by the bowel segment and is often seen in the context of ileocystoplasty. [36],[37]

This chronic metabolic acidosis can cause mobilization of calcium carbonate from bone to act as a buffer and calcium can therefore be excreted in the urine. [38] Depletion of bone calcium can in turn lead to reduced growth potential in children. Indeed, studies have shown that one in five children having undergone colocystoplasty show a 50% of reduction in growth rate. [33],[39],[40] Another metabolic disturbance particularly associated with colocystoplasty is hypokalemia due to secretion of potassium by the colonic patch. [41] In the setting of gastrocystoplasty, hypochloremic metabolic alkalosis occurs due to loss of gastric acid in the urine. Kurzrock et al. (1998) noted that this phenomenon occurred in up to 7% of gastrocystoplasties, but rarely required clinical correction. [42],[43]

Reflux and renal function

Augmentation lowers intravesical pressure and increases bladder compliance during the urine storage phase and therefore reflux usually improves or resolves post AC. [44] Renal function has variably been reported to improve, remain stable or deteriorate post AC. In studies that have shown deterioration in renal function, the rate of decline appeared to be related to the pre-operative creatinine clearance - one study found deterioration in only 4.1% of patients who had a creatinine clearance of ≥40 mL/min. [34] Therefore, whilst significant renal impairment has traditionally been a relative contraindication, this is now viewed as controversial. Studies in neuropathic pediatric patients with chronic renal impairment undergoing AC showed no change in renal function at 2 year follow-up in 73% using ileal or colonic segments. The specific role of different bowel segments on the rate of decline of renal function has not been extensively studied in the literature - however, in patients with pre-existing renal impairment; thought must be given to re-implanting the ureters in an anti-reflux fashion at the time of AC to minimize the upper tract damage by reflux. In addition, use of gastric segments in those patients is associated with reduced risk of absorption of electrolytes and urinary tract infections (UTIs), but this must be carefully balanced against the other risks of gastrocystoplasty including peptic ulceration of bladder, hematuria- dysuria syndrome and risk of malignancy. [1],[42],[43]


   ISC, UTI and Urinary Tract Calculi Top


Since the native bladder and intestinal patch cannot contract simultaneously, emptying the augmented bladder is dependent upon abdominal straining to increase abdominal pressure and simultaneous relaxation of the pelvic floor. [45] Many patients are therefore reliant on ISC to reliably empty the augmented bladder. ISC rates vary from 26% to 100%, generally increase with time and are higher in the neuropathic group of patients. [27],[46],[47] For instance, Greenwell et al.(2001) reported a 60% ISC rate in neuropathic patients compared with 6% in idiopathic patients. [33]

ISC may be associated with UTI in AC. Whilst asymptomatic bacteriuria can be very common in AC, the incidence of symptomatic UTI is reportedly lower. One study showed recurrent bacteriuria rate of 75%, but only a 20% incidence of troublesome UTI. [33] UTIs in AC patients have been associated with large residual volumes, the presence of mucus and the need to use ISC. [1],[33],[48],[49]

UTI in these patients has also been associated with the formation of bladder calculi.

Bladder stones have been reported in up to 40% of AC and are thought to arise as a result of urinary stasis. [1],[50] One of the largest series of 500 pediatric patients undergoing AC showed a 15% rate of bladder calculi. [51] Bladder calculi are five times as common in augmented patients who use ISC when the bladder is catheterized urethrally and 10 times as common in patients with Mitrofanoff-type channels. [52],[53] The risk factors for urolithiasis post AC include urinary stasis and UTI and patients with inadequate bladder emptying should perform ISC and have UTIs treated promptly. Furthermore in cases where AC is combined with ureteric reimplantation, a non-refluxing ureteroneocystostomy should be considered to reduce the risk of upper tract reflux and calculi. [52],[53]

There is however a lower incidence of stones in gastrocystoplasty, whichth may be related to the lower quantity of mucus production, the lower urinary pH and the lower incidence of bacteriuria. [54] Most of the stones can be removed endoscopically, but patients with large stones and those with no urethral access require open surgery for removal. [54]

Bladder perforation and carcinoma

Both those complications are rare but require a high index of suspicion to diagnose. Spontaneous bladder perforation is a life-threatening complication of augmentation, with a reported mortality of up to 25%. [55] The median time from surgery is about 35 months, with 33% ≤2 years and 35% between 2 and 6 years after augmentation. [56] The most usual site of perforation is the junction between the bowel and bladder wall and rupture may be explained by local ischemia of this area. [57] Most perforations are intra-abdominal and exploratory laparotomy is warranted in clinical cases of suspected balder rupture as the diagnosis can often only be made intraoperatively. [55],[58]

The risk of malignancy in the augmented bladder has been estimated to be around 1.2% and a typically exhibits a long latency period (19-22 years). [59],[60] The highest risk appears to be following gastrocystoplasty. [61],[62] Tumors tend to be adenocarcinoma although transitional cell carcinomas have been reported. Recommendations have been made for routine cystoscopic surveillance to begin 10 years after enterocystoplasty on an annual basis. [60]

Urinary and bowel function

Resection of the terminal ileum can lead to bile acid malabsorption, diarrhea and fat malabsorption. [63] Troublesome gastrointestinal symptoms including diarrhea occur in up to 25% of patients, but augmentation with sigmoid appears to have less effect upon the bowel function than ileocystoplasty. [64] As regards bladder function, incontinence is sometimes a problem after AC, particularly at night. Large series have published continence rates of 78% with cystoplasty alone. [1],[33] Management of incontinence post AC includes ISC, anticholinergic medications, further reconstructive bladder neck surgery or urinary diversion, or insertion of an artificial urinary sphincter. The literature shows a continence rate of 80-100% with these adjuvant treatments. [33]


   Conclusion Top


AC retains a role in modern urological practice especially in refractory OAB and the pediatric population. Large studies have proven the efficacy of AC by improving patient symptoms and urodynamic parameters. Developments in technique have seen laparoscopic and robotic AC being performed with minimal morbidity. The long-term complications are well-documented in the literature.

 
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    Abstract
   Introduction
    Current Indicati...
    Surgical Perspec...
   Complications
    ISC, UTI and Uri...
   Conclusion
    References
    Article Figures
    Article Tables

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