Acute Colonic Pseudo-Obstruction (ACPO) Management

Clinical Presentation and Diagnosis

Patients with acute colonic pseudo-obstruction (ACPO) present with abdominal distension, nausea, vomiting, and signs mimicking mechanical large bowel obstruction, typically occurring in debilitated or critically ill patients with serious underlying comorbidities 1
Diagnosis requires radiographic evidence of colonic dilation, combined with clinical signs of obstruction, after excluding mechanical causes through imaging, with CT scan essential to rule out mechanical obstruction and evaluate the extent of colonic dilation 1

The primary concern is colonic perforation, which carries mortality rates of 27-57% when it occurs, with cecal diameter being the critical measurement 2
Other complications include aspiration pneumonia from vomiting, electrolyte disturbances, and renal dysfunction from dehydration 1

Initial management should be conservative in all patients without signs of perforation or peritonitis, yielding outcomes similar to or better than aggressive interventional management, with first-line conservative treatment including strict bowel rest, nasogastric tube decompression, aggressive intravenous fluid resuscitation, correction of electrolyte abnormalities, discontinuation of medications that impair colonic motility, and rectal tube decompression 1
Monitoring requirements include serial abdominal examinations and radiographs to monitor colonic diameter progression, and watching closely for signs of clinical deterioration 1
Surgical intervention is mandatory only for patients with signs of peritonitis, perforation, or clinical deterioration despite 24-48 hours of medical management, with surgical options including cecostomy or colonic resection 1