Management of Metabolic Ileus

Evaluation and Initial Management

The American College of Surgeons recommends correcting electrolyte imbalances, especially potassium and magnesium, which directly affect intestinal motility 1, 2
Nasogastric tubes should only be placed in patients with severe abdominal distension, vomiting, or risk of aspiration, and removed as soon as possible 1, 3
Isotonic intravenous fluids should be administered to correct and prevent dehydration, avoiding fluid overload 1, 2
Weight gain should be limited to <3 kg by the third postoperative day to prevent intestinal edema 1

The American Society of Anesthesiologists recommends implementing analgesia strategies that avoid opioids, such as thoracic epidural analgesia, to prevent prolonged ileus 1, 2
Oral laxatives such as bisacodyl and magnesium oxide should be administered once oral intake is resumed 1, 2
For persistent ileus, water-soluble contrast agents or neostigmine may be considered as rescue therapy 1
Medications that can worsen ileus, such as anticholinergics, should be avoided 1, 2

Early oral intake with small portions should be encouraged once bowel sounds return 1
If oral intake is expected to be inadequate (<50% of caloric requirements) for more than 7 days, early enteral nutrition should be initiated 1
If enteral nutrition is contraindicated, early parenteral nutrition should be provided 1

Early mobilization should be encouraged as soon as the patient's condition allows to stimulate intestinal function 1, 2
Early removal of urinary catheters may facilitate mobilization 1, 2

In patients with ileus and preserved colon, intake of monosaccharides and oligosaccharides should be limited to prevent lactic acidosis 4
Signs of confusion that may indicate lactic acidosis or hyperammonemia should be monitored, especially in patients with short bowel syndrome 4
Laparoscopic approaches should be preferred over open surgery when necessary for postoperative ileus 1, 2
Enhanced recovery after surgery (ERAS) protocols that include multiple components should be implemented to reduce the incidence and duration of postoperative ileus 1

Routine use of nasogastric tubes should be avoided as they can prolong ileus 1, 3
Adequate fluid balance without overload should be maintained to prevent intestinal edema 1, 2

Signs of return of intestinal function, including passage of flatus and bowel sounds, should be evaluated 2
Oral intake should be gradually resumed once intestinal function returns, starting with clear liquids and advancing as tolerated 2

In cases of severe diarrhea or high-output stomas, fluid production and urinary sodium should be monitored, and fluid intake adapted accordingly (decreasing hypotonic fluids and increasing saline solutions) 5
Parenteral infusions (fluids and electrolytes) may be necessary in cases of high-output stomas 5

Patients with chronic ileus should be considered for referral to specialized centers for parenteral nutrition or integrated intestinal failure units 6