pouches and stomas
TRANSCRIPT
POUCHES AND STOMAS
Pouches and stomasMyles Fleming
Neil Mortensen
AbstractA third of patients with ulcerative colitis will need colectomy. This can be
followed by ileal pouch formation to enable restoration of normal bowel
continuity. Patients with familial adenomatous polyposis may also
undergo pouch formation. The commonest long-term problem with
pouches is pouchitis though this can often be treated with antibiotics.
Stomas come in many forms but the commonest types are ileostomy or
colostomy and these can be permanent or temporary. The expertise of
a stoma nurse is vital to the management of these patients.
Keywords adenomatous polyposis coli; colostomy; ileal pouches;
ileo-anal pouches; ileostomy; J pouch; pouchitis; restorative proctoco-
lectomy; ulcerative colitis
Pouches
A pouch, or more correctly an ileal pouch anal anastomosis
(IPAA), is formed during a restorative proctocolectomy. During
this operation, the entire colon plus rectum from the ileocaecal
valve to 2 cm above the dentate line are removed, and an ileal
pouch is formed and anastomosed to the ano-rectal remnant.
Since this operation was first described in 1978,1 it is estimated
that worldwide over 30,000 pouches have been formed.
Reasons for pouch formation
The commonest pathologies for forming a pouch are ulcerative
colitis (UC) and familial adenomatous polyposis (FAP).
Ulcerative colitis: up to one-third of patients with UC may
require colectomy long term. This can be in an urgent setting,
during an episode of acute severe colitis that has failed to
respond to intravenous corticosteroids and rescue therapy; or
elective, when medical management has failed to control colitis
or dysplastic/cancerous changes have occurred. The cancer risk
is related to the degree and extent of inflammation in the colon,
the presence of post-inflammatory polyps or colonic strictures,
primary sclerosing cholangitis or family history of colorectal
cancer.2 It has been estimated that 18% of patients found to have
UC will develop cancer 30 years from diagnosis.3
Myles Fleming MRCS is a Surgical Registrar at the John Radcliffe
Hospital, Oxford, UK. Competing interests: none declared.
Neil Mortensen MD FRCS is Professor of Colorectal Surgery in the Nuffield
Department of Surgery, University of Oxford and Consultant Colorectal
Surgeon for the Oxford Radcliffe Hospitals, Oxford, UK. Competing
interests: none declared.
MEDICINE 39:5 259
Familial adenomatous polyposis: FAP is an autosomal domi-
nant condition in which a defect in the adenomatous polyposis
gene leads to at least 100 colonic polyps forming in the colon.
This can occur as early as the teenage years, with the potential of
cancer change by the mid-twenties. As it is not possible to
remove all the polyps endoscopically, a prophylactic colectomy
has to be performed, normally before the age of 25 years.
Patients with a milder phenotype, with a lower polyp count,
can be offered deferred surgery or subtotal colectomy with
ileorectal anastomosis. Compared to pouch surgery, ileorectal
anastomosis gives better bowel function and, as it avoids pelvic
dissection, decreases the risk of pelvic nerve injury and/or
impaired fertility. The rectal remnant will require regular
screening as it has a 12e29% risk of developing cancer change.2
Contraindications
Crohn’s disease (CD): used to be an absolute contraindication to
pouch formation as it results in multiple pouch fistulae and high
failure rates. However, in patients who have only colonic disease
it can be successful.4
Indeterminate colitis: recently renamed to IBD unclassified
(IBDU), is the pathological description given to the 5e10% of
IBD patients in whom histology cannot distinguish CD from UC.
Many patients with IBDU subsequently turn out to have CD, so it
is a relative contraindication to pouch formation. However with
careful preoperative assessment to exclude features linked to CD,
a good outcome can be achieved.5
Pouch design
J pouch: (Figure 1) this is the commonest type of pouch formed
today. The end of the ileum is stapled closed and the small bowel
is looped back on itself to create a J that is 20 cm long. An
opening is made in the apex of the J to allow the passage of
a 10 cm long linear stapler. This is fired twice, converting the
parallel lumens into one large lumen.6 The apex is then anasto-
mosed to the rectal remnant.
W pouch: (Figure 1) another type of pouch is the W pouch. In
this pouch the small bowel is looped three times, so four lengths
of small bowel lie next to each other. These are then joined
together to form a pouch. The argument for this design is that it
gives a large reservoir size, so pouch emptying is less frequent,
but in our practice we have found that a J pouch is adequate.
S pouch: historically, the first described pouch was an S pouch.
In this pouch, the most distal part of the small bowel is anasto-
mosed to the anus with the pouch being just proximal. This
pouch frequently has problems with pouch emptying and so has
fallen out of favour.
Rectal remnant
There has been debate about themucosa left in the rectal remnant.
As the rectum is normally the worst affected part of the bowel in
UC and as in FAP cancer can develop in any colonic mucosa, some
have argued that a mucosectomy should be routinely performed.
The main benefit of keeping this mucosa is better sensation and
less damage to the sphincter, leading to a better functional
outcome.7 Mucosectomy with a hand-sewn anastomosis is also
� 2011 Elsevier Ltd. All rights reserved.
Pouch design
Stapled ileal J-pouch Stapled anastomosis to the top of the anal canal
Hand-sewn W-pouch Hand-sewn pouch–anal anastomosis in the mid-anal canal
20 cm
10 cm
Anal sphincter
Dentate line
Anal sphincter
Dentate line
Figure 1
POUCHES AND STOMAS
associated with increased septic complications.8 Furthermore, in
the Cleveland series of pouches, mucosectomy was not protective
against pouch neoplasia in IBD patients.9
Staged surgery
Figure 2 Endoscopic view inside a normal, healthy pouch. The seam of
one of the vertical stricture lines in this J pouch can be seen (lower left).
Though some centres have reported good results from one-stage
surgery, it is more commonly done as a two-stage or three-stage
procedure. This is because anastomotic leak is the major early
complication of pouch formation and can lead to long-term
pouch dysfunction and failure.10
Two-stage: if the patient is having the pouch for UC that has
escaped medical therapy in a chronic setting, or for FAP, surgery
is performed in two stages. The first stage is panproctocolectomy,
ileal pouch formation and a defunctioning loop ileostomy. The
second stage, closure of the loop ileostomy, is performed around
3 months later after a pouchogram has shown no leaks.
Three-stage: if the colectomy is being performed for acute severe
colitis, the procedure is performed in three stages. Here, the first
stage is a subtotal colectomy and end ileostomy with the rectum
left untouched. Several months later, when the patient no longer
requires corticosteroids, the inflammatory response has resolved
and nutritional status has returned to normal, a completion
proctectomy, pouch and defunctioning loop ileostomy is per-
formed. Finally, as with the two-stage approach, the loop ileos-
tomy is subsequently closed.
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Laparoscopic versus open
Increasingly, the colectomy is performed as a laparoscopic proce-
dure. Laparoscopic colorectal surgery has been shown to have
short-term benefits over open surgery, though long-term advan-
tages have been harder to demonstrate. In our experience, like that
of others,11,12 there is a feeling that laparoscopy leads to fewer
adhesions, and so a smaller future risk of adhesional obstruction
and easier pouch formation if the operation is three-stage.
As laparoscopic colorectal surgery has matured, the proctec-
tomy and pouch anal anastomosis has increasingly been formed
laparoscopically.13 However, if difficulties are encountered using
this approach, it is important to convert to open operation, as
leaving a long rectal stump leads to a poorer long-term outcome.
Alternatives
Though pouch surgery is viewed as the gold standard in those
requiring colectomy there is no need to form a pouch if the
patient is happy to be left with an end ileostomy.
Kock pouch: in those who do not want, or cannot cope with, an
ileostomy but are prevented from having an IPAA due to poor
sphincter function, an alternative is the Kock pouch (continent
ileostomy).14 The Kock pouch is similar in shape to an S pouch,
except that the distal end is intussuscepted into the pouch,
forming a ‘nipple valve’. The distal small bowel is then sutured
low on the abdominal wall as a flat ileostomy. The ‘nipple valve’
prevents the stoma discharging any contents unless a Medena
catheter is passed. This form of pouch was first described in 1969
but went out of favour with the creation of the IPAA, since it still
requires a stoma, and because technical difficulties with the
nipple valve led to its slippage and leakage of stoma effluent.
Normal function
A mature well-functioning pouch will empty 5e6 times a day
(Figure 2). The contents are liquid, though after the pouch has
been in place for some years the effluent may thicken. Nocturnal
pouch emptying is common.
� 2011 Elsevier Ltd. All rights reserved.
POUCHES AND STOMAS
Some patients don’t require any dietary modification or
medication but most patients do need to be careful with their diet
(see Table 1), and it is common to use varying amounts of
loperamide to slow pouch emptying.
In some patients, pouch leakage can be problematic and, as
a routine in our centre, all patients have their anal sphincters
assessed before having pouch surgery. This is especially impor-
tant in women who have suffered obstetric trauma, as weak
sphincter function can result in problems with pouch continence.
The UK National Pouch Registry reported nocturnal seepage
occurring in 8% of patients at 1 year, rising to 15.4% at 20
years.15
Fertility and sexual function
All men undergoing pouch surgery need to be warned of the
possibility of erectile dysfunction secondary to damage to rectal
nerves during the rectal dissection. This risk has been reported to
be small,16 but all men at our centre are routinely offered sperm
storage. Male sexual function scores seem unaffected by pouch
surgery.17
Pouch surgery has an adverse impact on female fertility,
although the scale of this is debated. One meta-analysis reported
a threefold increased risk of infertility,18 though a later study
from Finland found that the frequency of childbirth was reduced
only to 80% of that in their control group.19
The mode of childbirth is controversial. Though several
studies report that vaginal delivery is safe after pouch formation,
a third of vaginal deliveries can be associated with occult
sphincter injury, and we believe that there may still be problems
in the long term that have not yet become apparent.8
After pouch surgery, female sexual function scores are worse
than male,17 despite being better than female scores before pouch
surgery.20
Foods that may affect pouch and stoma output
Increase and loosen output Beans, beer, caffeinated
beverages, chocolate, leafy green
vegetables, raw fruits and
vegetables, spicy food,
wholemeal food, cereal, alcohol,
citrus fruits and juice
Decrease and thicken output Apple sauce, bananas, boiled
rice, cheese, smooth peanut
butter, tapioca, white bread,
potatoes, suet pudding, pasta
Increase flatus Beer, carbonated beverages,
dried beans and peas, milk and
milk products, onions, cabbage,
broccoli, sprouts
Can obstruct ileostomy, pouch
inlet or pouch outlet
Mushrooms, sweetcorn, potato
skins, nuts, tomato skins, raw
fruit skins, celery strings
May cause anal irritation Citrus fruits, popcorn, oriental
vegetables, bran, coconut
Table 1
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Long-term complications
Pouch complications are best managed in a stepwise manner.
The first step is clinic assessment with pouchoscopy to assess the
mucosa, size of pouch, length of rectal stump, and presence of
anastomotic stricturing. If needed this can be followed with stool
culture, MRI of the pelvis to check for small abscesses, poucho-
gram to look for sinuses or fistula, and examination under
anaesthetic to assess the pouch more fully.
Pouchitis: the most common problem is pouchitis. This presents
with bleeding (Figure 3), pain and increased pouch frequency. It is
believed to be a reactivation of the immune abnormality that led to
the ulcerative colitis, as the frequency of pouchitis is up to 50% in
those who have a pouch formed for UC but only 10% in those
with FAP.21 In most patients it is an inconvenience that settles
after a two-week course of ciprofloxacin and/or metronidazole.
Chronic pouchitis, which affects 5e10% of patients, is diffi-
cult to manage; options comprise maintenance ciprofloxacin, or
the probiotic, VSL#3,22 which has achieved good results in some
centres. Metronidazole cannot be used long term due the risk of
peripheral neuropathy.
Occasionally, other pouchproblems (such as Crohn’s disease or
bacterial overgrowth) can be misdiagnosed as chronic pouchitis,
so it is important that patients are properly assessed. Importantly,
too small a pouch can present with increased frequency.
Anaemia: vitamin B12 absorption in the terminal ileum can be
disrupted by pouch formation. Iron deficiency anaemia can result
from bleeding secondary to pouchitis.
Fistula: in our practice, we tend to assume that a single fistula is
due to an operative complication, with anastomotic leak as the
commonest cause. If multiple fistulae develop, it is likely that the
initial pathology was wrong and the patient has Crohn’s disease.
Fistulae are managed initially with seton placement. If they
fail to heal, TNF-a antagonists can be tried. Surgical options
include advancement flaps, defunctioning ileostomy or, in the
Figure 3 Acute inflammation of a pouch.
� 2011 Elsevier Ltd. All rights reserved.
POUCHES AND STOMAS
most difficult cases, revision pouch surgery. If the patient has
multiple fistulae, the ultimate result is often pouch excision with
end-ileostomy formation.
Vaginal fistulae have a poorer outcome than other fistulae, only
47% of patients achieving resolution in one reported series.23
Difficulties with emptying: stenosis of the pouch anal anasto-
mosis can result in problems with emptying; this normally
results from the pouch being placed in the pelvis under too much
tension, damage to its blood supply or pelvic sepsis. Another
cause of emptying difficulties is too long a rectal stump.
Both can be managed with intermittent catheterization of the
pouch or pouch revision surgery.
Pouch cancer: the cancer risk is small, with only around 30
cancers reported worldwide.9 Recent guidelines advise 5-yearly
pouchoscopy in UC patients, 10 years from diagnosis, with FAP
patients and UC patients who had dysplasia on colectomy having
annual pouchoscopy.2
Pouch failure: the UK National Pouch registry reported failure
rates following primary pouch formation of 9.3% at 5 years and
16.1% at 10 years, with sepsis being the major cause.15 An older
Cleveland Clinic series showed failure rates of 9% at 5 years and
13% at 10 years.24
Quality of life
Despite the multiple problems that can be associated with
pouches, most patients have good function and would recom-
mend them to others.25,26
Stomas
Stomas, from the Greek stoma meaning mouth, are the exteri-
orization of the bowel through the abdominal wall. They come
in a variety of types and can be either temporary (defunction-
ing) or permanent. They are described according to the part of
the bowel from which they are formed and the material they
pass.
Stoma types/design
Ileostomies: these are made from ileum and pass liquid effluent.
All ileostomies today are Brooke ileostomies where they are
spouted with the mucosa being stitched to the skin surface.27
This prevents the alkaline effluent and activated small bowel
enzymes from contacting the skin, so preventing excoriation.
An ileal conduit, created when the bladder needs to be
removed for bladder cancer, is made from ileum onto which the
ureters are sewn.
Colostomies: colostomies are constructed from colon and pass
formed stool. As stool does not irritate skin, they are formed
flush with the skin surface.
End stoma: stomas can also be further described as being in the
form of an ‘end’ where the stoma has only one opening.
Loop stoma: with a ‘loop’ both proximal and distal parts of the
bowel are brought to the skin surface and are opened next to each
other. Loop ileostomies normally have the proximal end spouted
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and the distal part flat. Loop colostomies are often difficult to
manage, due to their size and (often) awkward position.
Reasons for stoma formation
Cancer: colon cancer operations can result in a stoma. In an
abdominoperineal resection for very low rectal or anal tumours,
the complete rectum and anus including sphincters are removed,
so a permanent end colostomy must be formed.
In low anterior resection for low rectal tumours where the
anastomosis is below the peritoneal reflection, a temporary
defunctioning loop ileostomy is often formed. This is done because
the risk of a leak from the low join is high, so the faecal streamneeds
to be diverted until the anastomosis heals.
Diverticular disease:Hartmann’s operationwas initially described
for rectal cancer but is now more commonly performed for perfo-
rated sigmoid diverticular disease. If, at operation, gross faecal
contamination is found, it is not safe to form an anastomosis as this
will often fail to heal in the presence of bacterial contamination. In
this case, the segment of colon containing the perforation is excised
and an end colostomy is brought out. The distal remnant of colon,
the rectal stump, is left in situ, either closed and free in the
abdominal cavity, closed and subcutaneous, or as amucus fistula in
the bottom part of the midline wound.
Inflammatory bowel disease: the initial surgical management of
acute severe ulcerative colitis is total colectomy and end ileos-
tomy. Ileostomies are also formed during pouch surgery.
In Crohn’s disease, stomas are formed after a pan-
proctocolectomy for Crohn’s colitis, if the rectum needs defunc-
tioning to attempt healing of complex perianal fistulas, or when an
intra-abdominal abscess is found when performing small bowel
resection for strictures or fistulae.
Other causes: stomas can be formed as part of the management of
patients with anal sphincter damage, paraplegia, bowel obstruc-
tion, and before downstaging chemoradiotherapy of rectal cancers.
Normal function
As there is no sphincter mechanism or rectum to store stool,
there is no control over the passage of effluent. An ileostomy
tends to pass its effluent continually as the small bowel has
constant peristalsis, whereas a colostomy is still subject to
colonic clearance waves so effluent is passed intermittently,
usually only a few times a day.
Diet: a variety of foods are recognized as causing loosermotions and
patients should be advised of them (Table 1). If patients find their
ileostomy effluent is too large or frequent, loperamide can be used.
Flatus: flatus passed from an ileostomy results from swallowed
air or carbonated drinks. With colostomies the flatus is mainly
generated by bacterial fermentation in the colon. If flatus is
problematic, root vegetables can be excluded from the diet or
oral charcoal taken.
Stoma nurses
All centres routinely creating stomas should have specialist stoma
nurses. These nurses have taken on a significant part of the
� 2011 Elsevier Ltd. All rights reserved.
Figure 4 Retracted ileostomy.
POUCHES AND STOMAS
workload associated with the preoperative and postoperative
management of stomas.
Before any surgery involving possible stoma formation, a stoma
nurse should counsel the patient. Patients should also be preoper-
atively marked, to avoid placing the stoma in a skin fold or an area
that is difficult to access.
Postoperatively, stoma nurses help to educate the patient
about stomas and the changing of stoma appliances. They can
subsequently offer advice if the patient develops difficulties and
advise on the large variety of stoma appliances.
Long-term complications
High output: this is usually a problem only with ileostomies, as
they are proximal to the absorptive function of the colon. It can lead
to marked and rapid fluid and electrolyte imbalance e particularly
during bouts of infective gastroenteritis. High output stomas can
result from a short proximal length of small bowel or diseased
proximal small bowel (for example, in Crohn’s disease).
Psychological morbidity: stomas can be associated with signif-
icant psychological morbidity and problems with body image,
which can be helped by giving appropriate information and
counselling before their formation and support after.
Parastomal hernia: this results from protrusion of bowel along-
side the stoma through the opening in the muscular abdominal
wall. Incidences of up to 50% have been reported in the literature.
They canmake fitting of a stoma appliance difficult, increasing the
chances of a leak, and can cause pain from stretching of the
mesentery or pressure affects on the abdominal wall. They can
prove difficult to fix as they have a high rate of recurrence.
Stenosis/retraction: (Figure 4) this can occur due to a poor
blood supply to the stoma or if it was formed under too much
tension. It is managed conservatively, with dilatation or by
surgical revision.
Prolapse: this is mainly seen with ileostomies, where the spout
elongates. If problematic it requires surgical repair.
Skin irritation: the solid stool from colostomies rarely causes
problems. However ileostomy effluent is very irritating and can
MEDICINE 39:5 263
cause marked skin excoriation. Barrier creams and films can help
mild cases. Stoma nurses can assist with stoma bag fitting but
a poorly spouted stoma will require surgical revision.
Bleeding: granulation tissue, which readily bleeds, can develop
at the mucocutaneous junction. It can be managed with silver
nitrate cauterization. If no external tissue can be seen, it will
need investigation with endoscopy via the stoma.
Bowel obstruction: adhesional obstruction is the commonest
cause and is normally treated with ‘drip and suck‘. If the
obstruction fails to resolve, surgery can be performed but runs
the risk of forming new adhesions. Infrequent causes include
internal hernia or food bolus, the latter causing obstruction
where the stoma passes through the abdominal wall. A
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