Ileus Medication
- Author: Sandeep Mukherjee, MB, BCh, MPH, FRCPC; Chief Editor: Julian Katz, MD more...
Medication Summary
Thoracic epidural administration has been shown to be beneficial, both with open and with endoscopic colorectal surgery.[21] Epidural blockade with local anesthetics improves postoperative ileus by blockage of inhibitory reflexes and efferent sympathetics. Studies have shown that combinations of thoracic epidurals containing bupivacaine alone or in combination with opioids improve postoperative ileus.[22, 23] Continuous intravenous administration of lidocaine during and after abdominal surgery may decrease the duration of postoperative ileus.[24]
Peripherally selective opioid antagonists are an option for the treatment of postoperative ileus.[25] Methylnaltrexone (Relistor) and alvimopan (Entereg) are approved by the Food and Drug Administration. These agents inhibit peripheral mu-opioid receptors, which abolishes the adverse gastrointestinal effects of opioids; however, because these agents do not cross the blood-brain barrier, they do not impair the analgesic effects of opioids.[26] Methylnaltrexone is indicated for opioid-induced constipation in patients with advanced illness receiving palliative care, when response to laxatives has not been sufficient. In a study of 14 healthy volunteers evaluating the use of morphine plus oral methylnaltrexone in increasing doses, methylnaltrexone significantly reduced morphine-induced delay in oral-cecal transit.[27] Another study reported subcutaneous methylnaltrexone is effective in inducing laxation in patients receiving palliative care who have opioid-induced constipation and in whomconventional laxatives have failed.[28] However, because methylnaltrexone has only recently been approved by the US Food and Drug Administration (FDA), more rigorous trials are needed.
Alvimopan is indicated to help prevent postoperative ileus following bowel resection. It has a longer duration of action than methylnaltrexone. Taguchi et al examined 78 postoperative patients randomized to receive either placebo or alvimopan.[29] Fifteen patients underwent partial colectomy, 36 were status post simple hysterectomy, and the remaining 27 underwent radical hysterectomy. All of the patients were on patient-controlled analgesia pumps using either meperidine or morphine. Compared with patients on placebo, patients on alvimopan had their first bowel movement 2 days earlier, resumed a solid diet 1.3 days earlier, and returned home 1.4 days earlier. Other recent trials have been completed, including a meta-analysis comparing alvimopan with placebo[30] and a study that found alvimopan to accelerate gastrointestinal tract recovery after bowel resection, regardless of age, gender, race, or concomitant medication.[31]
Use of prokinetic agents has shown mixed results. Randomized trials have shown some benefit of the colon-stimulating laxative bisacodyl for the treatment of ileus.[32, 33] Erythromycin, a motilin receptor agonist, has been used for postoperative gastric paresis but has not been shown to be beneficial for ileus.[34] Metoclopramide (Reglan), a dopaminergic antagonist, has antiemetic and prokinetic activities, but data have shown that the drug may actually worsen ileus. In a randomized controlled study on 210 patients undergoing major abdominal surgery, Wattchow et al reported that perioperative low dose celecoxib markedly reduced the development of paralytic ileus compared to diclofenac.[35] The effect was independent of narcotic use and was not associated with any increase in postoperative complications.
A review of meta-analyses and randomized controlled trials on drugs used for post-operative ileus was reported by Yeh et al.[36] The investigators identified three meta-analyses (2 on gum-chewing and 1 on alvimopan) and 18 clinical trials. Only gum chewing and alvimopan were effective in preventing ileus but due to safety concerns and costs with alvimopan, gum chewing may be preferred as first-line therapy. Gum chewing has also been used in women recovering from cesearian section with good effect when compared to standard of care in a randomized study conducted.[37]
Opioid Antagonist, Selective
Class Summary
Selective opioid antagonists are indicated to prevent postoperative ileus.
Alvimopan (Entereg)
Peripherally acting mu-opioid receptor antagonist. Binds mu-opioid receptors in gut, thereby selectively inhibiting negative opioid effects on GI function and motility. Indicated for postoperative ileus following bowel resection with primary anastomosis. Five clinical studies with enrollment >2500 patients demonstrated accelerated recovery time of upper and lower tract GI function with alvimopan compared with placebo. Decrease of hospital days also observed in alvimopan group compared with placebo.
Only available to hospitals after they complete a registration process designed to maintain the benefits associated with short-term use and prevent long-term, outpatient use (Entereg Access Support and Education [EASE] program).
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| Ileus | Pseudo-obstruction | Mechanical Obstruction (Simple) | |
| Symptoms | Mild abdominal pain, bloating, nausea, vomiting, obstipation, constipation | Crampy abdominal pain, constipation, obstipation, nausea, vomiting, anorexia | Crampy abdominal pain, constipation, obstipation, nausea, vomiting, anorexia |
| Physical Examination Findings | Silent abdomen, distention, tympanic | Borborygmi, tympanic, peristaltic waves, hypoactive or hyperactive bowel sounds, distention, localized tenderness | Borborygmi, peristaltic waves, high-pitched bowel sounds, rushes, distention, localized tenderness |
| Plain Radiographs | Large and small bowel dilatation, diaphragm elevated | Isolated large bowel dilatation, diaphragm elevated | Bow-shaped loops in ladder pattern, paucity of colonic gas distal to lesion, diaphragm mildly elevated, air-fluid levels |

