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Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_917_Библиотеки_им_академика_М_И_Перельмана.pdf
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Suture
Allis clamp
18 Laparoscopic Left andSigmoid Colectomy: Options forColonic andColorectal…
Fig. 18.1 (a) Placement
of a handsewn purse string in the colostomy. (b) Cinching down of the purse string with the stapling anvil in place
a
Colon
275
b
Mesentery
Anvil
Suture
Colon
(e.g., vagina, bladder) incorporated into the staple line and make sure the proximal purse string remains intact (Fig.18.2c). Once the stapler is red and extracted, the anastomotic doughnuts should be inspected for completeness. A complete doughnut is intact circumferentially and includes all layers of the bowel wall– mucosa, mus­cularis, and serosa. The nal step in creating a secure anastomosis involves assessing that the anastomosis is airtight and intact, which will be discussed below.
276
EEA stapler
ab
Sacrum
Spike
Staple line
Rectum
M. G. Mutch
c
Proximal colon anvil
Fig. 18.2 (a) Sagittal view of the pelvis and rectum. EEA stapler passed to the top of the rectal
stump. (b) EEA stapler with the spike deployed. (c) The anvil is attached to the EEA staple cartridge
End toSide Anastomosis
An end to side anastomosis is variation of an end to end that does not require the placement of a purse string. It can be used for any level of rectal anastomosis. For this technique, the colon is divided sharply, and the colotomy is opened. The anvil is passed into the lumen via the end colotomy (Fig. 18.3a). The spike is then brought out through the antimesenteric wall roughly 3–4 cm proximal to the colotomy and secured in position with a clamp (Fig.18.3b). The colotomy is then re-approximated with Allis clamps and closed with a ring of linear stapler (Fig.18.3c). It is critical to ensure that the anvil is brought out through the colonic
Allis clamp
18 Laparoscopic Left andSigmoid Colectomy: Options forColonic andColorectal…
AnvilColotomy
3-4 cm
a
b
277
Linear
stapler
c
Fig. 18.3 (a) The stapling anvil is passed through the open colotomy at the end of the colon. (b)
The anvil is brought out the antimesenteric border of the colon 3–4cm proximal to the end colos­tomy. (c) The end colotomy is closed by approximating it with Allis clamps and stapling with a linear stapler
wall proximal enough to ensure that the linear staple line is not incorporated into the circular staple line and that there is enough tissue (>2cm) between the circular and linear staples lines to maintain perfusion to this bridge of tissue. Once the placement of the anvil is complete, the anastomosis is created using the same technique as described above.
278
M. G. Mutch
Colonic J Pouch
Proctectomy with reconstruction has a very profound impact on a patient’s bowel function. Therefore, surgeons have developed several reservoir or neorectum proce­dures for anastomosis within 5cm of the anal verge. Utilization of a reservoir above 5cm often results in increased difculties with evacuation. Options for reconstruc­tion after proctectomy include a straight colorectal anastomosis (described under end to end anastomosis), colonic J pouch, transverse coloplasty, and the Baker anas­tomosis (described under end to side anastomosis). Functionally, the colonic J pouch has better immediate outcome, but after 2years all of the types of reconstruc­tion have similar functional outcomes [4]. Using a reservoir for an anastomosis above 5cm may result in difculties with evacuation. Anastomosis at the pelvic oor will require division of the inferior mesenteric artery at its origin, division of the inferior mesenteric vein at the inferior boarder of the pancreas, and complete mobilization of the splenic exure to ensure adequate length for the proximal colon to reach the pelvic oor. For the best functional outcomes, it is recommended that soft, pliable descending colon be used for the anastomosis. Utilization of stiff, thickened sigmoid colon will result in decreased compliance of the neorectum and may increase the chances of developing low anterior resection syndrome.
A colonic J pouch is constructed to be 5cm in length. A larger reservoir is associ­ated with evacuation difculties. The colon is divided with a linear stapler, and staple line may be oversewn to prevent a leak at the tip of the J.A colotomy is made on the antimesenteric border 5cm proximal to the transecting staple line (Fig.18.4a). One fork of the stapler is passed up the proximal limb, and the other fork is passed up the distal limb. The stapler is then reassembled, and the bowel wall is rotated so that the stapler will re down the antimesenteric boarder of the colon (Fig.18.4b). It is important to ensure that all epiploic appendages are excluded from the staple line. Once the stapler is removed, a handsewn purse string in a Connell fashion is placed at the colotomy. The EEA stapling anvil is placed into the colotomy, and purse string is cinched down (Fig.18.4c). The anastomosis is then created by pass­ing the stapling device transanally and deploying the spike through the rectal stump. The anvil is then connected to the stapling cartridge ensuring proper orientation of the left colon. As the stapler is cinched down, the anterior tissues (prostate and blad­der in a male and the vagina in a female) must be elevated and conrmed to be free of the EEA staple line before ring. Given the complexity of J pouch and the low anastomosis, most surgeons would recommend proximal diversion.
Transverse Coloplasty
A transverse coloplasty is an acceptable alternative to a colonic J pouch when the pouch will not t into the pelvis. Reasons that a J pouch will not t into the pelvis include a bulky mesentery and or a narrow pelvis. Construction of the coloplasty begins with sharp division of the proximal colon, placement of a purse string, and
5cm
18 Laparoscopic Left andSigmoid Colectomy: Options forColonic andColorectal…
Mesentery
279
Staple line
a
Suture
Colotomy
Cautery
b
Anvil
Finger
GIA stapler
c
Fig. 18.4 (a) Creation of colonic j pouch. A 5cm limb is measured, and a colotomy is made at the
apex of the pouch on the antimesenteric border. (b) A GIA stapler is used to create the pouch. The nger is used to get the mesentery out of the staple line so the staple line is antimesenteric to antimesenteric. (c) A purse string is placed using a handsewn technique
280
Anvil
Suture
Colotomy
8 cm
4 cm
Edges of the bowel
Suture
Lembert
suture
M. G. Mutch
line
Anvil
Anvil
abc
Fig. 18.5 (a) The anvil is in place in the distal colotomy and secured with a handsewn purse
string. The measurement for the placement and extent of the colotomy are shown. (b) The colot­omy is open with electrocautery. The rst layer is closed in a transverse fashion with a running suture. (c) The colotomy closure is reinforced with a second layer of Lembert sutures
securing of an EEA stapling anvil. On the antimesenteric border of the colon and 4cm proximal to the anvil, an 8cm colotomy is created and extended proximally (Fig.18.5a) The longitudinal colotomy is then closed in a transverse direction in a handsewn fashion (Fig.18.5b). A 3-0 monolament suture is for the rst layer. Beginning at one of the corners, a running Connell stitch is used to close the colot­omy, and the second layer of imbricating Lembert stitches are placed to reinforce the suture line (Fig.18.5c). With the coloplasty completed, an end to end anastomo­sis is completed as previously described.
Baker’s Anastomosis
This is the same anastomosis as that described in the end to side technique. When constructed as an anastomosis at 5cm or less from the anal verge, functional out­come falls in between that for a colonic J pouch and a transverse coloplasty.
Anastomotic Assessment
Once the anastomosis is created, it must be appropriately assessed to ensure that it is intact. Proper assessment has three components: (1) inspection of the anastomotic doughnuts, (2) air leak testing, and (3) direct intraluminal visualization of the
18 Laparoscopic Left andSigmoid Colectomy: Options forColonic andColorectal…
anastomosis. The proximal and distal anastomotic doughnuts should be intact cir­cumferentially with all three layers of the bowel. The management of incomplete doughnuts is addressed below. Inspection of the anastomosis itself can occur with either rigid proctoscopy or exible endoscopy. With either technique, the pelvis is lled with normal saline, and the bowel is manually occluded proximal to the anas­tomosis. The endoscope is then introduced transanally into the rectum, air is insuf­ated to distend the anastomosis, and the pelvis is examined for the presences of air bubbles. The management of an anastomosis that is leaking air bubbles is described below. During or after the air leak test, the endoscope is used to directly evaluate the anastomosis. The anastomosis is examined for completeness, bleeding, and perfu­sion. For more details on techniques to assess the integrity and perfusion of left­sided anastomoses, please refer to Chap. 29 on minimizing colorectal anastomotic leaks.
281
Pitfalls andTroubleshooting
Unable toPass Stapler totheTop oftheRectal Stump
The longer the rectal stump, the more difcult it can be to get the EEA stapler to navigate past all of the rectal folds and get the stapler head ush against the trans­verse staple line. Adhesions or scarring of rectum may make it difcult in which case further mobilization of the rectum will be benecial. This may require mobili­zation below the peritoneal reection. The upper rectal folds or a narrowed upper rectum may also prevent passage of the stapler. The use of EEA sizers may help atten out the folds or dilate a narrowed rectum because of their oval shape, and this will help to facilitate the passage of the at or square face of the stapler head. If this is unsuccessful, then the rectum needs to be divided again at the level to where the stapler can easily be passed.
Rectal Stump Blowout
A disruption of the transverse staple line on the rectum can be one of the most frus­trating situations because it often happens at the end of a long case. Poor tissue quality, thickened rectum, and traumatic rupture from passing the stapler are all causes of the rectal staple line falling apart. If this occurs in the upper rectum, it is easily rectied by dividing the rectum a few centimeters below the previous staple line. If this is due to a thicken rectum, it may be helpful to use a longer staple height when stapling across the rectum or dividing the rectum a level where it is the softest. When the disruption of the staple line occurs in the rectum below the peritoneal reection, salvaging the rectum becomes much more complicated. The rst step is to mobilize the rectum to the pelvic oor circumferentially. This will maximize the chances that another stapler can be red across the rectum. If you are unable to re­staple the rectum laparoscopically, conversion with a suprapubic incision is
282
M. G. Mutch
warranted. This will allow the rectal stump to be grasped with clamps and re-stapled with an open linear stapler. If it is not possible to staple across the rectal stump, there are two remaining options. The rst option is a handsewn purse string on the rectal stump. All of the staples must rst be removed. The purse string can be placed intraabdominally from an open or laparoscopic approach. With the use of a 2-0 monolament suture, a purse string is sewn in a full-thickness Connell fashion. This can be particularly challenging because of limitations of the laparoscopic instru­mentation, and because visualization from an open approach is poor at best. A sec­ond option is to place the purse string transanally. With the patient in the lithotomy position, the legs are frog-legged in the stirrups to expose the anus. The anus in then everted with Lone Star retractor. An operating anoscopy is passed into the anal canal, and the purse string is then placed in the same fashion as above. In either the transabdominal or transanal technique, the stapler is inserted into the rectum, and the spike is deployed before the purse string is cinched down. The purse string is then tied around the spike of the stapler, ensuring that the rectal wall is securely and circumferentially drawn into the stapler. The ultimate fallback for when the rectal stump cannot be salvaged is a mucosectomy with a handsewn coloanal anastomosis. This will work for all the described types of reconstruction. Once again, the patient is placed in high lithotomy position to expose the anal canal. The anal canal is everted with a Lone Star retractor. If the top of rectal stump is visible and easily accessed, the staple line is excised, and the anastomosis is created. Otherwise, a mucosal incision is made circumferentially 1–2cm above the dentate line. The sub­mucosal plane is developed and dissected in a cephalad fashion, and eventually the dissection becomes full thickness resecting the rest of the rectal stump. The idea is to preserve as much of the internal sphincter as possible. With the dissection com­pleted, the rst sutures are placed in the rectum at the 12, 3, 6, and 9 o’clock posi­tions. The sutures are placed from inside the lumen to the outside, and the needles are left on the suture. Next the proximal colon is grasped transanally and delivered into the anal canal. The sutures are then sutured to the proximal colon in an outside to inside fashion, so the knots for each suture are inside the lumen. Each quadrant is then completed with full-thickness, interrupted sutures.
Positive Air Leak Test oftheAnastomosis
The assessment of the anastomosis entails inspection of the anastomotic doughnuts and air leak testing of the anastomosis as described above. As a result, there are four different scenarios that can arise (Fig.18.6): (1) complete doughnuts with an air­tight anastomosis, (2) complete doughnuts with air leaking from the anastomosis, (3) incomplete doughnuts with an airtight anastomosis, and (4) incomplete dough­nuts with air leaking from the anastomosis. Each component of the scenarios impacts the management of the anastomosis. The ideal is intact doughnuts with an airtight anastomosis. However, if the doughnuts are incomplete or there is an air leak at the anastomosis, this will require further management. The presence of com­plete doughnuts with an air leaking from the anastomosis is managed based on the
18 Laparoscopic Left andSigmoid Colectomy: Options forColonic andColorectal…
Airleak Test
283
Negative
Anastomotic doughnuts
Intact
Good
Fig. 18.6 Algorithm for managing a positive air leak test
Incomplete
Revise anastomosis
or
Diverting stoma
Fine champagne bubbles
Oversew
Revise
Diverting stoma
Positive
Anastomotic doughnuts
Intact
Large bubbles
Revise
Diverting Stoma
Incomplete
Revise
Diverting Stoma
size of the air bubbles leaking and the source can be clearly visualized. Small “champagne” bubbles for the anterior half of the anastomosis that can be visualized can be managed by placing Lembert stitches across the anastomosis. The placement of multiple stitches along the anastomosis is recommended as a single suture is not adequate. If the small “champagne”-type bubbles cannot be seen, consider proximal diversion or revision of the anastomosis by taking it down and recreating it. If the bubbles are large with an obvious defect in the staple line, this needs to be managed with revision of the anastomosis. However, if the anastomosis is low and can be accessed transanally, the anastomosis can be repaired transanally with proximal diversion. When the doughnuts are incomplete with an airtight anastomosis, this anastomosis should be protected with proximal diversion, or it should be revised because it cannot be guaranteed that the anastomosis is full thickness. For an anas­tomosis with incomplete doughnuts and leaking air, it should be taken down and re-created as proximal diversion alone is unlikely to be sufcient. For more details on techniques to manage intraoperative air leak and other anastomotic complica­tions, please refer to Chap. 30 on how to salvage the failed anastomosis.
Staple Line Bleeding
With routine use of endoscopic assessment of the anastomosis, it is easy to identify and manage bleeding from the anastomosis. It is important to use CO2 insufation so the colon and rectum do not remain distended. If a site of bleeding is identied, it can be managed with endoscopic clips or injection with epinephrine or coagu­lated. Caution with epinephrine is needed as to not over-inject, causing issues with local perfusion and with caution with electrocoagulation as not to cause extensive thermal injury to the anastomotic tissue. If transanal or endoscopic attempts at con­trolling the bleeding fails, direct suture ligation of anastomotic bleeding can be
284
achieved using a transanal endoscopic platform (TEM/TAMIS), assuming the anas­tomosis can be reached.
M. G. Mutch
Inadequate Reach oftheColonic Conduit
Ensuring the proximal colon has adequate reach for a well-perfused and tension­free anastomosis is critical to ensure proper healing. The rst steps to provide ade­quate length for the colon to reach the top of the rectal stump include high ligation of the inferior mesenteric artery at its origin, ligation of the inferior mesenteric vein adjacent to the ligament of Treitz near the inferior border of the pancreas, and full mobilization of the splenic exure with division of the attachment to the inferior border of the pancreas to the midline. If there is still inadequate length to reach the rectal stump, then additional maneuvers will be required, which will be presented in a step-wise progression. First, complete mobilization of the transverse colon from the omentum and the attachments within the lesser sac especially the stomach. This mobilization should extend to the hepatic exure. Second, the colon may be brought down the right side of the abdomen and passed through a window on the small bowel side of the ileocolic pedicle. This is an avascular window, and by bringing the colon through this window, it is the shortest path and prevents the colon from cours­ing over the terminal ileum (Fig.18.7). Third, the middle colic vessels can be ligated in a sequential fashion. If the colon maintains perfusion from one of the remaining branches of the middle colic vessels, bringing the colon down the right side as described above is often adequate to reach into the pelvis. Finally, if perfusion to the distal colon or there is still not enough length, then resection of the distal portion of the colon to a point where the prefusion to the remaining colon is depend upon the ileocolic pedicle will be needed. To get adequate length, complete mobilization of the right colon and the proximal colon can be brought into the pelvic either via the window in the ileal mesentery described above or with the use of Deloyer’s tech­nique. The Deloyer’s technique involves complete mobilization of the right colon and its mesentery off the retroperitoneum. The proximal colon is then rotated coun­terclockwise 180, so the colon is brought down the patient’s right side, and the cecum ends up in the right upper quadrant (Fig.18.8a, b).

Outcomes

Anastomotic Leak
An anastomotic leak is one of the most dreaded complications associated with colorectal resections. Its occurrence has signicant impact on the patient’s recov­ery, bowel function, cancer-related outcomes, and may ultimately result in a per­manent stoma. These are multifactorial events, and the literature is full of reports detailing potential risk factors. The literature has several limitations that impact our ability to accurately identify true and consistent risk factors such as