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Файл:Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_629_Библиотеки_им_академика_М_И_Перельмана
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9
Ileocolic artery
10
Cecum
Terminal ileum
11
12
Duodenum
Middle colic vessels
173
PLATE
78
T C T
P
INCISION AND EXPOSURE An incision is made down the le
lumbar gutter, and because the thickened and vascular peritoneum has a tendency to contract, all bleeding points should be carefully ligated (figure 13).
e peritoneum is li ed up until the le gonadal vessels and ureter are identi ed. Both should be identi ed throughout most of their course down over the
brim of the pelvis (figure 14).
In total abdominal colectomy, without planned proctectomy, the rectosigmoid junction should now be divided. e remaining vasculature to the
colon can be divided close to the bowel. e superior hemorrhoidal vessels and presacral space should not be violated. When a second procedure
(either ileorectal anastomosis or proctectomy and ileoanal pouch reconstruction) is contemplated, these planes should be le as virgin territory to
facilitate that subsequent procedure.
TOTAL PROCTOCOLECTOMY e remaining description applies to the
completion of a single-stage total proctocolectomy. As shown in figure 15,
the mesentery is divided adjacent to the rectosigmoid rather than up over
the iliac artery bifurcation, as would be done in carcinoma. e peritoneum
adjacent to the bowel is divided a er identi cation of the ureters on either
side, and the peritoneum in the pouch of Douglas between the rectum and
bladder or cervix is incised. is ap is carefully elevated. is dissection
along with that into the presacral space is facilitated by using lighted deep
pelvic retractors, a focused headlight on the surgeon, and an extra-long
insulated electrocautery tip. e dissection proceeds into the same presacral
space as the mesorectal dissection, but the surgeon can stay closer to the rectum laterally and anteriorly, as this operation does not require the wide margins necessary for a malignancy. At this point, the rectum may be divided
with a cutting linear stapler (GIA) or endoscopic reticulating GIA stapler
or it may be transected between clamps (figure 16). e distal stump is
then oversewn (figure 17). At this time, sharp dissection about the rectum
should be carried out to free it as low as possible in order to lessen the blood
loss during the subsequent perineal excision.
In the presence of multiple polyposis, a segment of rectum can be
retained to cm above the pouch of Douglas or at a distance that can
be easily reached by the sigmoidoscope for subsequent fulguration of the
multiple polyps. When this is done, the terminal ileum is anastomosed to
the rectal pouch in a side-to-end manner.
Absorbable sutures are used to close the peritoneal oor. e location of
the ureters should be ascertained from time to time to avoid injury during
the reconstruction of the pelvic oor. As in abdominoperineal resection, a
pedicled omental ap can o en be constructed to ll the pelvis a er excision of the rectum.
CONTINUES
174
13
Descending
colon
Line of incision
in lateral gutter
14
Left ureter
15
Pouch of Douglas
Right ureter
Plastic bag
Gonadal
vessels
Left ureter
Iliac artery
16
External
iliac artery
Left ureter
17
175
PLATE
79
T C T
P
TOTAL PROCTOCOLECTOMY A er the pelvis has been rep-
eritonealized, some of the raw surfaces in the le lumbar gutter also can be
covered if the tissues are su ciently lax (figure 18). Again, the sutures should
be placed so as to avoid injuring the underlying ureters and gonadal vessels.
To complete the total proctocolectomy, the anus is excised as described in the
perineal section of abdominoperineal resection (Plates and ). e only
exception is that it is not necessary to go wide on the levators when a simple
extirpation of the sphincter muscles and bowel wall itself is carried out. e
incision for the excision of the anus is shown in figure 22. Primary closure
with catheter suction can be used.
ILEOSTOMY e construction of the ileostomy is of major importance.
e small intestine may be removed from the plastic bag and the site selected
for ileostomy exposed. e location of the previously marked ileostomy site
is evaluated. e midway point between the umbilicus and anterior iliac
spine is again veri ed by a sterilized ruler. e ileostomy site is placed a
little below the midway point (figure 1, Plate ). With Kocher clamps
applied to the fascial edge of the incision a er removal of the self-retaining
retractor, a -cm circle of skin is excised. A er the button of skin and the
underlying fat have been removed, all bleeding points are controlled. en,
while applying traction against the abdominal wall from underneath with
the le hand, the surgeon makes a stellate incision through the entire thickness of the abdominal wall. Any bleeding that is encountered, especially
in the rectus muscle, is clamped and ligated. An opening large enough to
admit two ngers easily is usually more than su cient.
Noncrushing vascular-type forceps are inserted through the ileostomy
site and applied just proximal to the similar forceps on the terminal ileum
(figure 19). e original forceps are removed, and the ileum is withdrawn through the abdominal wall with the mesentery cephalad. At least
to cm of mesentery-free ileum should be above the skin level so that
an ileostomy of adequate length can be constructed. It may be necessary,
especially in the obese patient, to undercut the terminal ileum under the
mesenteric blood supply to attain this essential length. e viability is then
reevaluated a er the ileum is pulled up through the abdominal wall. e
mesentery can be anchored to the abdominal wall or brought up into the
subcutaneous tissue (figure 20). It may be advisable to anchor the mesentery of the ileum to the parietes laterally before constructing the ileostomy, because of the possibility of interfering with the blood supply to the
terminal ileum. e right lumbar gutter should be closed o to avoid the
potential of a postoperative internal hernia. At times it may be di cult to
approximate the mesentery of the right colon and ileum to the right lumbar gutter and e ect a closure (figures 20 and 21). e surgeon should
palpate the right gutter repeatedly and place whatever sutures are necessary to close it completely or else leave it completely open. e completed
ileostomy should extend upward from the skin level at least . to cm.
e mucosa is anchored with interrupted ne synthetic absorbable sutures
to the serosal edge of the bowel at the level of the skin and then to skin
(figure 21). Likewise, the mesentery may be anchored to the peritoneum,
but no sutures should be taken between the seromuscular coat of the terminal ileum and the peritoneum. When the terminal ileum is divided with
a cutting linear stapler (GIA), the maturation of the stoma is delayed until
a er closure of the abdominal wounds, the staple line is excised, and the
stoma matured as described.
CLOSURE A double-looped ( or ) delayed absorbable suture is used for
running closure of the midline linea alba incision. In very large patients,
two sutures are used that begin at either end of the incision. Interrupted
ne absorbable sutures may be placed in Scarpa’s fascia. e skin is closed
with staples, although some prefer to use absorbable subcutaneous sutures
followed by adhesive skin strips. At the end of the case, a dry sterile dressing covers the abdominal incision and an ostomy appliance is put about
the ileostomy. In the presence of marked emaciation and prolonged steroid
therapy, the use of retention sutures should be considered.
POSTOPERATIVE CARE Blood should be replaced as it is lost during the
procedure. Additional blood or colloids may be required on the a ernoon
of surgery and during the early postoperative period. Constant bladder
drainage is traditionally maintained for at least or days. Some surgeons
now remove the catheter on the rst postoperative day. If the patient has
been on steroid therapy, this is continued during the postoperative period.
A transparent temporary-type ileostomy appliance is placed over the ileostomy before moving the patient to the recovery area. is permits frequent
observations of the stoma to make sure it maintains a pink and viable color.
A strict intake and output chart must be maintained at all times following an
ileostomy. Likewise, daily electrolyte determinations are essential because
of excessive losses of electrolyte-rich uid. Excessive amounts of uid are
occasionally lost, and large amounts of intravenous uids, electrolytes, and
colloids will be required to maintain uid balance. e nasogastric tube is
removed early and oral intake of liquids advanced as tolerated. e drains
should then be removed, with serial observations as described in the discussion of abdominoperineal resection (Plate ). ese patients require
frequent and prolonged observation because of the tendency to a variety
of complications ranging from abscess formation to intestinal obstruction.
ey should be in contact with an enterostomal therapist, who ideally may
be available during o ce visits to the surgeon. ■
176
18
Small bowel
Ligament of Treitz
19
Ileostomy site
Right
ureter
21
Left ureter
20
Reperitonealization
of right gutter
Duodenum
Right
ureter
22
Perineal incision
177
PLATE
80
A R R:
E--E A
INDICATIONS is may be the operation of choice in selected individuals
with malignant lesions in the rectosigmoid or low sigmoid area in order
to reestablish the continuity of the bowel. e operation is based on the
premises () that the viability of the lower rectum can be sustained from
the middle or inferior hemorrhoidal vessels and () that carcinoma in this
region as a rule metastasizes cephalad, only rarely metastasizing to cm
below the primary growth. It is questionable whether an anterior resection should be advised for growths occurring within cm of the pectinate
line. e ideal situation would appear to be a small tumor located at the
junction of the rectum and the sigmoid. However, there are many times
when the growth can be mobilized much more than anticipated, especially
when the bowel is released down to the levator muscles. e exposure is
another factor that may in uence the surgeon for or against a low anastomosis. A low anastomosis is much easier and safer in the female than in the
male, especially if the pelvic organs of the former have been removed previously. A loop ileostomy (Plate ) is sometimes done at the time to divert
the fecal stream temporarily from the end-to-end anastomosis or to ensure
decompression of an inadequately emptied colon. A side-to-side (Baker)
anastomosis should be considered when there is considerable discrepancy
between the sizes of the two lumina or an excess of fat that may encroach
unduly upon the lumen of an end-to-end anastomosis. Most prefer a stapling device for the anastomosis (Plate ).
PREOPERATIVE CARE See Plate .
ANESTHESIA See Plate .
POSITION e patient is placed in the Trendelenburg position. e oppo-
site position is useful while the splenic exure is being mobilized.
OPERATIVE PREPARATION e skin is prepared in the usual manner. A
Foley catheter is inserted into the bladder.
INCISION AND EXPOSURE A midline incision is made from the sym-
physis to a level above and to the le of the umbilicus. e liver and upper
abdomen are carefully palpated to determine the existence of any metastases. e site of the tumor is examined with special consideration as to its size
and location, the amount of dilation of the bowel proximal to the growth,
and the ease of exposure. In many instances the type of resection cannot be
determined until the lower segment of the bowel has been mobilized.
DETAILS OF PROCEDURE e small intestines are walled o and a self-
retaining retractor is inserted into the wound. e peritoneum of the pelvic colon is freed from the region of the sigmoid downward on either side
(figure 3). It is important at this point to identify and isolate both ureters
and the spermatic or ovarian vessels. e peritoneum is divided anterior
to the rectum at the level of the base of the bladder or cervix. e growth
can be further mobilized by mesorectal dissection (Plate , figure 8).
A er the peritoneal attachments have all been divided, and the rectum is
freed both posteriorly and anteriorly, it is possible to bring this growth up
into the wound and gain considerable distance as a result of freeing and
straightening the rectum (figures 1 and 2). e blood supply to the distal
segment from the inferior hemorrhoidal vessels is adequate, should the
middle hemorrhoidal vessels be ligated to ensure additional mobilization.
e inferior mesenteric artery is ligated at the level of the superior hemorrhoidal vessels or as it arises from the aorta (figure 3) and the inferior
mesenteric vein is divided. is provides maximum lymphatic lymph node
removal and gives additional mobility to the descending colon. e blood
supply to the colon must now come from the middle colic artery through
the marginal vessels of Drummond (figure 3).
e bowel should be prepared for division at least cm below the gross
lower limits of the growth to assure removal of all adjacent lymph nodes.
A Stone or a Pace-Potts anastomosis clamp is applied across the previously
prepared site of division of the bowel, and a long, right-angle clamp may be
utilized for the proximal clamp. e bowel is divided between the clamps.
e bowel containing the growth is then brought outside the wound, and
clamps are applied to the previously prepared site well above the lesion
(figure 5). e surgeon must now determine that the upper segment of the
bowel is su ciently mobile to be brought down for anastomosis without
tension. In order to accomplish this, it may be necessary to divide the lateral peritoneal attachment of the le colon up to and including the splenic
exure. Unless the sigmoid is very redundant, the le half of the transverse
colon along with the splenic exure must be mobilized. e midline incision is extended at this point to ensure a good exposure, since undue traction on the colon may tear the capsule of the spleen. e splenic exure
is also mobilized, as in Plate . e lesser sac is entered a er the splenic
attachments to the colon have been divided. e greater omentum is freed
from the transverse colon as shown in Plate . Extra mobility and length of
bowel are provided until repeated trials clearly demonstrate that the proximal segment will easily reach the site of anastomosis. e adequacy of the
blood supply should be determined even when the bowel is extended down
into the pelvis preliminary to the anastomosis.
e serosa along the mesenteric border of the upper segment should be
cleared of fat for at least cm proximal to the Pace-Potts clamps (figure 5).
Likewise, the margins and especially the posterior wall of the lower segment
must be cleared of fat adjacent to the Pace-Potts clamp (figure 5). Careful
dissection with repeated application of small clamps may be necessary to
accomplish a clean serosal boundary of cm adjacent to the clamp in preparation for a safe anastomosis. Following this, the two ends of the clamps
are approximated and then manipulated so that a posterior serosal layer of
silk can be placed easily (figure 6). e ends of these sutures are cut,
except those at either angle, which are retained for traction. As a preliminary
to removing the clamp, the eld is walled o with gauze, and an enterostomy clamp is gently applied to the upper segment to prevent gross soiling
(figure 6). e crushed contents of the clamps may be excised. e lower
clamp is then removed, and the crushed margin of bowel is excised and
opened (figure 7). Suction is instituted to avoid any gross contamination
of the eld. Fine silk sutures may be inserted for traction in the midportion of the lower opening and at either angle. ese traction sutures tend
to facilitate the anastomosis (see Plate , figures 16 & 17). e posterior mucosal layer is approximated with several Babcock forceps, and the
mucosa is approximated with interrupted silk sutures. e anterior
mucosal surface is closed with interrupted silk sutures of the Connell type, with the knot on the outside. e mucosa may be closed with
a continuous synthetic absorbable suture (figure 8) rather than
interrupted silk sutures. Following this, the anterior serosal layer is carefully placed, using interrupted Halsted sutures of ne silk (figure 9).
e peritoneum is anchored adjacent to the suture line. e patency of the
anastomosis, as well as the lack of tension on the suture line, should be
tested. e peritoneal oor is closed with interrupted absorbable sutures
(figure 10). e raw surfaces are covered by approximating the mesenteric
margin of the sigmoid to the right peritoneal margin (figure 10). e sig-
moid is loosely attached to the le pelvic wall by anchoring the fat pads, not
bowel wall, to the le peritoneal margin to prevent subsequent tension on
the anastomosis as well as to cover the raw surfaces. A transverse colostomy
or diverting loop ileostomy (Plate ) should be considered if there is any
suspicion regarding the technical perfection of the anastomosis. A drain
may be inserted into the le side of the pelvis and brought out at the lower
angle of the wound. Some operators prefer to have a rectal tube in place,
which can be guided up beyond the anastomosis to assist in decompressing
the bowel during the early postoperative period. e rectal tube is anchored
in position by a silk suture placed at the anal margin. Some prefer to use a
surgical stapling instrument for the anastomosis. See Plates and .
CLOSURE Closure is performed in a routine manner.
POSTOPERATIVE CARE e rectal tube is le in place for a few days and
enemas should be avoided. e patient is gradually allowed to resume a
full diet. Mineral oil may be given. If a proximal diverting loop ileostomy is
used, the patency of the anastomosis should be tested by contrast uoroscopy before closure is e ected several weeks a er surgery. See Postoperative
Care, Plate , for general postoperative care. ■
178
Sigmoid artery
1
Superior
hemorrhoidal
artery
Lesion
Middle
hemorrhoidal
artery
Inferior
hemorrhoidal artery
Lymphatics of rectum
4
2
Left
colic artery
Peritoneal
reection
Distance
gained
Middle
hemorrhoidal
artery
Lesion
Marginal artery
of Drummond
Involved nodes
3
Left
colic artery
5
Ureter
Inferior
mesenteric artery
Stone clamp
6
7
10
A
9
B
A
8
B
Peritoneum
approximated
179
PLATE
81
INDICATIONS e stapler o ers certain advantages in the performance of
a low anterior resection, provided the surgeon is thoroughly familiar with
the technique. ose favoring this method of approximating the sigmoid
to a short rectal stump emphasize the ease of the anastomosis, especially
in the narrow pelvis of the male. e time required for the operation may
be shortened and the indications for a temporary proximal diverting loop
ostomy decreased. Use of the stapler does not alter the principles of adequate resection of tumors at approximately cm or less from the anus. is
is because anastomoses lower than cm from the anus may be associated
with incontinence and because a distal margin of to cm below the cancer
is recommended to minimize the rate of local anastomotic recurrence. e
success of a properly performed anastomosis depends on an adequate blood
supply to the residual bowel segments, which can be brought together easily
without tension. Cancers below the peritoneal re ection in the pouch of
Douglas should be evaluated with endorectal ultrasound for their staging
and spread. Preoperative radiation therapy and chemotherapy should be
considered for these lesions.
PREOPERATIVE PREPARATION An empty colon results from one day of
liquid diet. e usual bowel preparation is given the day prior to surgery,
while parenteral antibiotics are administered just prior to the start of the
procedure. Since the stapler is to be introduced through the anus, it is mandatory that the lower colon and rectum be carefully emptied and cleansed
just before the procedure is started. A large mushroom catheter commonly
is introduced into the rectum for a saline irrigation until clear. Several
ounces of a mild antiseptic solution such as povidone-iodine can be
instilled at the time the procedure is started. An inlying bladder catheter is
essential for good exposure.
ANESTHESIA General endotracheal anesthesia is satisfactory.
POSITION e patient is placed in a semilithotomy position using Allen stir-
rups and in a modest Trendelenburg position to enhance exposure of the deep
pelvis and permit the introduction of the stapling instrument via the anus.
OPERATIVE PREPARATION Not only the abdominal wall from the xiphoid
to the pubis, but the skin over the perineum, groin, and especially the anal
A R, S
region are prepared since the instrument will be introduced through the
anus.
INCISION AND EXPOSURE A long midline incision is made starting
just above the symphysis and extending to the umbilicus and around it on
the le side to provide easy access to the splenic exure (figure 1). e
liver is palpated for possible metastasis, and the location and mobility of
the growth as well as the presence or absence of metastatic lymph nodes
are veri ed by palpation. e small intestine may be placed in a plastic
Lahey bag to which some saline solution is added. e mobility of the
transverse and descending colon is evaluated with special reference to the
adequate exposure of the splenic exure. Undue traction on the omentum
or colon in the region of the spleen may result in troublesome bleeding
from a tear in the splenic capsule, hence many surgeons routinely mobilize the splenic exure.
DETAILS OF PROCEDURE e indications for an anterior resection are
recon rmed, and the sigmoid and transverse colon are mobilized using the
same incision and exposure techniques as in Plate (figure 2 & 3). A
high ligation of the inferior mesenteric lymphovascular pedicle is carried
out following exposure and clear identi cation of the le gonadal vein and
ureter. e sigmoid artery is ligated near the inferior mesenteric artery with
preservation of the arcade between the ascending and descending branches
of the le colic artery. e mesentery of the le colon is divided over to the
junction of the sigmoid and descending colon (figure 2).
Two methods of stapled closure are presented.
METHOD 1—RECTAL STAPLING A point on the sigmoid is selected for
division, and the mesenteric border is meticulously cleared for a distance
of approximately cm (figure 3). Active pulsations must be present in the
mesentery, and the cleared area must be free of diverticuli. A total mesorectal excision (Plate ) is carried out to at least cm, preferably cm, below
the tumor. A linear stapler is red across the rectum at that level (figure 4)
and the mesorectum is divided. Some staplers close both sides while cutting
between the staple lines, while others re only one line of staples and hence
require a clamp on the proximal (“specimen”) side. e rectosigmoid specimen is then li ed out of the pelvis.
CONTINUES
180
1
Incision
2
Outline of
incision
Superior
hemorrhoidal
vessels
Sigmoidal
vessels
Left
3
colic artery
4
Bowel wall
Left ureter
Left
gonadal vein
181
PLATE
82
METHOD 1—RECTAL STAPLING e end of the sigmoid is
then opened. If there is doubt as to the size of stapler needed, retraction stay
sutures are placed and circular stapler (EEA) sizers can be passed into the
sigmoid to determine the largest size that ts easily (figure 5). A circumferential purse string of polypropylene suture is placed (figure 6). e
open end of the sigmoid is gently manipulated over the end of the anvil, and
the suture is securely tied (figure 7). e assistant gently dilates the anus
and inserts the curved stapler of appropriate diameter (figure 9). e surgeon assists from above in the passage of the instrument as the spike advances
through the rectum, usually just posterior to the stapled stump (figure 9).
e adequacy of the previously placed purse-string suture is carefully
determined. e completeness of the mucosal closure is rechecked to be
certain there is no gap between the sha of the purse-string closure. Bulky
puckering of excess tissue must be avoided, lest failure to compress the tissues
adequately will lead to failure of the anastomosis. As the assistant closes the
instrument from below (figure 9), the surgeon from above, prevents fatty
tissues from being trapped between the bowel ends. e assistant veri es that
the stapler is tightened to the correct thickness for the height of its staples
as shown by a color-bar indicator in the handle of the stapler. e trigger is
released and the handles squeezed to re and create the anastomosis.
A er ring of the stapler, the manufacturer’s routine for releasing the
instrument is followed carefully to avoid the possibility of disrupting the
line of staples during its removal (figure 10). Additional interrupted
sutures may be placed around the anastomosis, and all raw surfaces in the
pelvis are reperitonealized where possible.
Before closure of the abdomen, the “doughnuts” created by the instrument must be carefully inspected for degree continuity (figure 11).
A gap indicates a possible leak which will require additional external
interrupted sutures. e integrity of the anastomosis is con rmed by lling the pelvis with sterile saline, and air is injected through a catheter or
proctoscope in the rectum. e appearance of air bubbles identi es the
presence of a leak that must be repaired by interrupted sutures. If there
is any doubt concerning the security of the nal anastomosis, a temporary proximal diverting loop ileostomy (Plate ) should be considered.
As the assistant tightens the clamp from below, the surgeon, from above,
prevents fatty tissues from being trapped between the bowel ends. e
assistant veri es that the stapler is tightened to the correct thickness for
the height of its staples as shown by a color-bar indicator in the handle
of the stapler. e trigger is pressed to re the instrument, and the bowel
wall is anastomosed.
A er ring of the stapler, the manufacturer’s routine for releasing the
instrument is followed carefully to avoid the possibility of disrupting the
line of staples during its removal. Additional interrupted sutures may be
placed around the anastomosis. All raw surfaces in the pelvis are retroperitonealized where possible.
Before closure of the abdomen, the “doughnuts” removed by the instrument must be carefully inspected for any evidence of a possible defect,
which will require additional interrupted sutures. A er lling the pelvis
with sterile saline, air may be injected through a catheter or proctoscope is
passed into the rectum. e presence of air bubbles con rms the presence
of a leak that must be repaired by interrupted sutures. When there is any
doubt concerning the security of the nal anastomosis, a temporary proximal diverting loop ileostomy (Plate ) should be considered.
Most surgeons prefer temporary drainage of the presacral space with
closed suction silastic drains. e drains are le in place for a few days until
the uid becomes more serous and smaller in volume. If large volumes of
rather clear uid are noted, then a urea content should be checked and the
bladder and ureters evaluated.
A R, S
METHOD 2—RECTAL PURSE-STRING A point on the sigmoid is selected
for division, and the mesenteric border is meticulously cleared for a distance of approximately cm. Active pulsations must be present in the mesentery. e cleared area must be free of diverticuli. e purse-string clamp
is applied obliquely to the bowel so as to preserve the -cm cleared bowel
proximally. is is necessary as the -cm zone will be enclosed within the
stapler anvil and will become the upper “doughnut.” If the wall is not carefully cleaned of fat, or if too thick a turn-in is created with a purse-string
suture that is placed freehand, the entire circumference of the bowel may not
be brought inside the instrument. is will result in an incompetent anastomosis and leak. Accordingly the placement of the purse-string sutures and
the examination of the upper and lower “doughnut” rings for intact pursestring sutures with degrees of full-thickness bowel wall turn-in are
most important steps with these instruments. A polypropylene suture
on a long, straight Keith needle is passed through the special openings in
the purse-string clamp, and a purse-string suture results. A straight Kocher
clamp is applied on the colon distal to the purse-string clamp and the bowel
is divided in between. e rectosigmoid is retracted forward toward the
symphysis as the peritoneum is incised and the rectal segment mobilized
from the presacral space using mesorectal dissection (Plate ). e posterior rectal wall is cleared of fat until at least cm of only the bowel wall is
exposed approximately cm or more distal to the tumor. In the male and
very obese patient, it is di cult to properly place the purse-string clamp and
even more di cult to insert the Keith needle to complete the purse-string
anastomosis. Under such circumstances, a noncrushing vascular clamp is
placed across the area cleared for the anastomosis similar to that shown in
figures 4 & 5 on Plate . A Kocher clamp secures the proximal speci-
men and the bowel is divided. e end of the sigmoid should be brought
down to the divided end of the rectum to verify once again the adequacy
of mobilization in order to avoid any chance of tension on the suture line
of staples. Additional mobility may be gained by ligating and dividing the
inferior mesenteric vein just below the inferior margin of the pancreas. e
decision now must be made whether to perform an open sutures anastomosis as shown in figures 8 & 9 on Plate or to use the transrectal circular
stapler a er placing the rectal stump purse-string suture by hand in a very
low anastomosis. In these cases some surgeons prefer to place the pursestring suture in the very short rectal stump from below using an anal speculum. More frequently, it is technically easier to maintain compression of the
rectal wall with a right angle vascular clamp while a purse-string suture is
placed in the protruding mucosa. Absorbable traction sutures can be placed
to serve as stay sutures, while the purse-string suture of polypropylene
sutures includes both in the muscular and mucosal layers. Also this suture
must be placed closeto the cut edge so as to ensure a snug approximation
of the entire bowel wall about the stapling instrument when it is tied. Blunt
EEA sizing instruments are passed into the open proximal bowel lumen and
into the rectum to de ne the largest-diameter stapler possible. e assistant
gently dilates the anus and inserts the circular EEA stapler from below. e
remainder of the procedure is same as described in METHOD .
CLOSURE Routine procedures are followed.
POSTOPERATIVE CARE Some postoperative rectal bleeding may occur
but usually stops spontaneously. e diet is slowly resumed a er the patient
passes atus. Some prefer to insert a catheter in the anus beyond the anastomosis for the venting of gas and anchor the catheter with a silk suture to the
perianal skin. e Foley catheter is removed a er days with careful observation of the volume and patterns of voiding. e patients may complain
of increased frequency and urgency that may persist for several months. A
tight anastomosis may require eventual gentle dilations. ■
182
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