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A rectal resection is the surgical removal of a portion of the rectum.
Rectal resections repair damage to the rectum caused by diseases of the lower digestive tract, such as cancer, diverticulitis, and inflammatory bowel disease (ulcerative colitis and Crohn's disease). Injury, obstruction, and ischemia (compromised blood supply) may require rectal resection. Masses and scar tissue can grow within the rectum, causing blockages that prevent normal elimination of feces. Other diseases, such as diverticulitis and ulcerative colitis, can cause perforations in the rectum. Surgical removal of the damaged area can return normal rectal function.
Colorectal cancer affects 140,000 people annually, causing 60,000 deaths. Incidence of the disease in 2001 differed among ethnic groups, with Hispanics having 10.2 cases per 100,000 people and African Americans having 22.8 cases per 100,000. Rectal cancer incidence is a portion of the total colorectal incidence rate. Surgery is the optimal treatment for rectal cancer, resulting in cure in 45% of patients. Recurrence due to surgical failure is low, from 4–8%, when the procedure is meticulously performed.
During a rectal resection, the surgeon removes the diseased or perforated portion of the rectum. If the diseased or damaged section is not very large, the separated ends are reattached. Such a procedure is called rectal anastomosis.
A number of tests identify masses and perforations within the intestinal tract.
- A lower GI (gastrointestinal) series is a series of x rays of the colon and rectum that can help identify ulcers, cysts, polyps, diverticuli (pouches in the intestine), and cancer. The patient is given a barium enema to coat the intestinal tract, making disease easier to see on the x rays.
- Flexible sigmoidoscopy involves insertion of a sigmoidoscope, a flexible tube with a miniature camera, into the rectum to examine the lining of the rectum and the sigmoid colon, the last third of the intestinal tract. The sigmoidoscope can also remove polyps or tissue for biopsy.
- A colonoscopy is similar to the flexible sigmoidoscopy, except the flexible tube examines the entire intestinal tract.
- Magnetic resonance imaging (MRI), used both prior to and during surgery, allows physicians to determine the precise margins for the resection, so that all of the diseased tissue can be removed. This also identifies patients who could most benefit from adjuvant therapy such as chemotherapy or radiation.
To cleanse the bowel, the patient may be placed on a restricted diet for several days before surgery, then placed
A tumor in the rectum or lower colon can be removed by a rectal resection (A). An incision is made around the patient's anus (B). The tumor is pulled down through the incision (C). An attached area of the colon is also removed (D). The area is repaired, leaving an opening for bowel elimination (E).
on a liquid diet the day before, with nothing by mouth after midnight. A series of enemas and/or oral preparations (GoLytely, Colyte, or senna) may be ordered to empty the bowel. Oral anti-infectives (neomycin, erythromycin, or kanamycin sulfate) may be ordered to decrease bacteria in the intestine and help prevent post-operative infection. The operation can be done with an abdominal incision (laparotomy) or using minimally invasive techniques with small tubes to allow insertion of the operating instruments (laparoscopy).
Postoperative care involves monitoring blood pressure, pulse, respiration, and temperature. Breathing tends to be shallow because of the effect of the anesthesia and the patient's reluctance to breathe deeply due to discomfort around the surgical incision. The patient is taught how to support the incision during deep breathing and coughing, and given pain medication as necessary. Fluid intake and output is measured, and the wound is observed for color and drainage.
Rectal resection has potential risks similar those of other major surgeries. Complications usually occur while the patient is in the hospital and the patient's general health prior to surgery will be an indication of the risk potential. Patients with heart problems and stressed immune systems are of special concern. Both during and following the procedure, the physician and nursing staff will monitor the patient for:
- excessive bleeding
- wound infection
- thrombophlebitis (inflammation and blood clot in the veins in the legs
- pulmonary embolism (blood clot or air bubble in the lungs' blood supply)
- cardiac stress due to allergic reaction to the general anaesthetic
Symptoms that the patient should report, especially after discharge, include:
- increased pain, swelling, redness, drainage, or bleeding in the surgical area
- flu-like symptoms such as headache, muscle aches, dizziness, or fever
- increased abdominal pain or swelling, constipation, nausea or vomiting, or black, tarry stools
Complete healing is expected without complications. The recovery rate varies, depending on the patient's overall health prior to surgery. Typically, full recovery takes six to eight weeks.
Mortality has decreased from nearly 28% to under 6%, through the use of prophylactic antibiotics before and after surgery.
If the section of the rectum to be removed is very large, the rectum may not be able to be reattached. Under those circumstances, a colostomy would be preformed. The distal end of the rectum would be closed and left to atrophy. The proximal end would be brought through an opening in the abdomen to create an opening, a stoma, for feces to be removed from the body.
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