Ileus Diagnosis and Management

Introduction to Ileus

Ileus is a functional obstruction of the bowel characterized by the failure to propel luminal contents in the absence of a mechanical obstructing lesion, resulting in symptoms similar to intestinal obstruction such as colicky abdominal pain, nausea, vomiting, abdominal distension, and often a dilated bowel 1, 2
The term "intestinal dysmotility" encompasses conditions where there is failure to propel luminal contents without an organic obstructing lesion 1

Common causes of acute or reversible ileus include abdominal surgery (postoperative ileus) 1, 2, trauma 1, sepsis 1, metabolic disturbances (e.g., hypokalemia) 1, 4, endocrine problems (e.g., hypothyroidism) 1, and medications (especially opioids and anticholinergics) 4

Symptoms mimic those of mechanical bowel obstruction and include colicky abdominal pain 1, 5, nausea and vomiting 1, 5, abdominal distension 1, 5, and absence of flatus and bowel movements 2
Diagnosis is based on clinical presentation, physical examination, and imaging studies 5
Radiological findings may include dilated bowel loops on plain abdominal radiographs 5
CT scan can help differentiate between ileus and mechanical obstruction 5

Initial management includes nil per os (NPO) status until bowel function returns 2, intravenous fluid administration to correct dehydration and electrolyte imbalances 2, 4, and nasogastric tube placement for decompression in patients with severe distention or vomiting 2, 4
Pharmacologic interventions include avoidance of medications that can worsen ileus (anticholinergics, opioids) 2, 4, and use of alvimopan (μ-opioid receptor antagonist) to accelerate gastrointestinal recovery in postoperative ileus 3, 4
Supportive measures include early mobilization to stimulate bowel function 2, 4, chewing gum to help stimulate bowel function through cephalic-vagal stimulation 2, 4, and nutritional support if ileus is prolonged 2, 4

Minimizing opioid use for pain control 2, 4, preferring laparoscopic over open surgical approaches when surgery is necessary 2, 4, early mobilization after surgery or illness 2, maintaining proper fluid balance without overload 2, 4, and mid-thoracic epidural analgesia to prevent postoperative ileus 2, 4