{'fraction_non_alphanumeric': 0.02675399644760213, 'fraction_numerical': 0.02142539964476021, 'mean_word_length': 4.72, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Lifting of the colon for laparoscopic-assisted colectomy for colon and rectal cancer.

Background and Objectives: Laparoscopic-assisted colectomy for colon and rectal cancer causes less surgical trauma than does open colectomy. However, current methods are more costly and require highly skilled staff. In addition, the technique for lymphadenectomy has yet to be standardized. We developed a technique that uses a nylon suture to elevate the colon. This method reduces costs without compromising the completeness of the resection. Methods: Three trocars are introduced and a 1–0 nylon suture is passed into the abdominal cavity and through the mesocolon. The colon is retracted anteriorly and is fixed by this suture to the abdominal wall. The main mesenteric vessels are under tension, and lymph node dissection is performed easily. This method requires only 2 surgeons, an operator, and a scopist, because the colon is fixed to the abdominal wall. In addition, the working space is more stable because the colon is fixed to the abdominal wall. The procedure is relatively independent of the skill of the first assistant. Results: From April 2000 to August 2002, this method was performed in 52 patients. The mean number of dissected lymph nodes was 16.9±9.0 (range, 6 to 41). Nine patients had lymph node metastases (17.3%). One patient developed hepatic recurrence; all patients are alive. No complication occurred that was related to lifting the colon. Conclusions: Using a suture to lift the colon is a useful method for performing laparoscopic-assisted colectomy with lymphadenectomy. This method reduces the number of surgical staff and the expense of the procedure.


INTRODUCTION
Laparoscopic assisted colectomies (LAC) for colon and rectal cancer have recently become more common in Japan. This procedure minimizes surgical stress and has been recognized as acceptable treatment for colorectal cancer based on long-term outcome studies and a low complication rate. 1,2 Long-term survival after LAC is similar to survival after conventional surgery, [3][4][5][6] but it is more expensive in terms of surgical instruments and surgical staff. We have developed a colon-lifting method using a suture that requires only 2 operators and 3 trocars. This technique can be performed without compromising curability.

SURGICAL TECHNIQUE
The patient is placed in the lithotomy position at 15degrees Trendelenburg. A 12-mm trocar is inserted below the navel through a small incision and pneumoperitoneum is created. Two additional trocars are placed superior and inferior to the lesion and serve as the working ports (Figures 1 and 2). The mesocolon is pierced near the line of transection with dissecting forceps. A 1-0 nylon suture is introduced into the lower abdominal cavity with a grasping needle (GraNee Needle, R-Med, Inc., Oregon, OH, USA) and passed through the mesocolon (Figure 3). The point of penetration of the mesocolon must be at least 10 cm from the edge of the tumor to avoid tumor implantation (Figure 2). The colon is retracted anteriorly using the suture, exerting slow and steady pressure to avoid injury to the vessels in the mesocolon. The suture is fixed to the abdominal wall by forceps. Then, traction is placed on the main nutrient artery (Figure 4). Lymph node dissection is performed easily because countertraction can be applied at the point of incision. The stability of the working space is achieved by fixing the colon to the abdominal wall. The main nutrient vessels are divided at their origin to facilitate lymph node dissection ( Figure 5). The mesocolon is dissected by medial approach. One port site for the trocars is enlarged, and the lesion is removed through it. The reconstruction is intracorporal for left-sided lesions and extracorporal for right-sided lesions. This method requires only a scopist in addition to the operator. In some cases, an extra traction suture is needed for lesions of the right colon or when the left or sigmoid colon is redundant.

INDICATIONS
LAC is indicated for colon and upper rectal cancer Յ5 cm in diameter. The documented existence of lymph node metastases preoperatively is an exclusion criterion.

RESULTS
From April 2000 to August 2002, 52 laparoscopic colectomies were performed with this method. Thirty-one patients had colon cancer in the following locations: cecum, 2; ascending colon, 5; transverse colon, 3; descending colon, 1; and sigmoid colon, 21. Twenty-one patients had rectal cancer, 17 in the upper rectum and 4 in the lower. One patient had rectal and sigmoid cancer. The mean operative time was 278Ϯ50 minutes (range, 115 to 380 min). The mean blood loss was 137Ϯ158 mL (range, 10 to 800 mL). No operative complications were attributable to this technique. The disease stage of primary cancer was as   Thirty-three lesions were well-differentiated adenocarcinoma, 17 were moderately differentiated adenocarcinoma, and 2 lesions were carcinoid. All patients are alive, and one patient has experienced a hepatic recurrence during a mean follow-up of 16.0Ϯ8.4 months (range, 4 to 33).

DISCUSSION
Since LAC for colon cancer was first reported in 1991, 7 its use has increased worldwide. One long-term follow-up study 1 of LAC for stage 3 colon cancer reported results comparable to those of open colectomy (OC). The most recent study was a randomized trial comparing LAC and OC. This study found that LAC was superior to OC in terms of morbidity, length of hospital stay, incidence of recurrence, and cancer-related survival. 8 In economic studies of diverticular disease 9,10 and cancer, 11 the total hospital costs were similar to or less than those for LAC than for OC, although the operating room charges were greater for LAC due to the need for many disposable items. Therefore, reducing the amount of instrumentation will increase LAC's attractiveness as a surgical option. In most reports, LAC required 4 or 5 trocars. [12][13][14][15] In our technique, only 3 trocar sites were needed, and one surgeon was able to perform the laparoscopic procedure assisted only by a scopist. We selected nylon suture for the lifting tool because there are advantages in terms of medical costs and cosmesis; nylon is a very inexpensive tool, and wound to the abdomen is very slight. Our method saves 1 or 2 trocar implements, so the difference is 13,640 yen (about 114 US dollars) per operation. In Japan, the surgeon's cost is inexpensive; it is about 3,500 yen (about 29 US dollars) per hour. The length of time for a laparoscopic procedure is about 2.5 hours, so this method saves about 8,750 yen (about 73 US dollars) per operation.
A similar method has been reported previously, 16 but our method is different in that the colon is elevated using a ligature. This maneuver places the vessels in the mesocolon under tension and facilitates lymphadenectomy. This method allows the beginning LAC surgeon to easily understand the operative anatomy. Because of suspension and fixation of the colon, the surgical field becomes stable, and the colon and mesocolon are on the same plane. The nutritional vessel is stretched in the mesocolon. The dissection line was easily placed under tension by using the grasping forceps because the colon was fixed to the abdominal wall.
Care must be taken to avoid injuring vessels when the ligature is passed. The suture should be passed central to the mesenteric arcade. The suture should be drawn through slowly and gently to avoid vascular injury.
Another concern is the risk of tumor implantation of lymph node metastasis from the mesocolon to the abdominal wall. Therefore, the passed suture should be at least 10 cm from the tumor. We have not encountered a lymph node metastasis that distance from the primary tumor. In fact, this method seems to be more of a nontouch technique than other procedures because the colon is manipulated only at points far from the cancer.
Concerning the length of operation, the mean time was 278Ϯ50 minutes. It was slightly longer than open surgery. But the learning curve has become shorter lately; it was about 180 minutes for colon cancer and 240 minutes for rectal cancer in the last 10 cases. We performed 80 traditional laparoscopic procedures that required 4 or 5 ports and 3 surgical personnel between 1993 and 2001. The mean time of all cases was 336Ϯ75 minutes. From 2000, it has been 290Ϯ41 minutes in the last 25 cases. So, the time of our lifting method is the same as that of the traditional laparoscopic method. A unique advantage of this method is that the operator is much less dependent on the assistant's laparoscopic skills, giving the surgeon greater control over the operation. It is likely that the introduction of robotics to handle the laparoscope will make it possible for a single operator to perform this procedure in the future.

CONCLUSION
Lifting the colon using a ligature is a useful technique for performing LAC with lymph node dissection. This method reduces the surgical staff and the amount of instrumentation.