Management of Abdominal Pain Associated with Peristalsis

Diagnostic Approach

• The American College of Gastroenterology recommends assessing for visible peristalsis and degree of abdominal distension on physical examination, as these findings suggest functional or anatomic distal obstruction 1
• The American College of Gastroenterology suggests performing digital rectal examination noting sphincter tone and checking for the pathognomonic "gush sign" (stenosis on examination followed by release of liquid stool when the examining finger passes through a spastic segment) 1
• The American College of Emergency Physicians recommends evaluating for peritoneal signs including rebound tenderness and guarding, which may indicate perforation or ischemia 2
• The World Journal of Emergency Surgery suggests obtaining focused history including chronic constipation since birth, previous abdominal surgeries, inflammatory bowel disease, endemic area exposure (for Chagas disease), and recent colonoscopy 1, 3

Laboratory Investigations

• The American College of Gastroenterology recommends ordering complete blood count, electrolytes, renal function, and inflammatory markers (white blood cell count, C-reactive protein) to assess for infection, dehydration, and electrolyte imbalances 2, 4
• The American College of Gastroenterology suggests considering procalcitonin level if presentation is delayed >12 hours to evaluate for bacterial infection 4
• The Centers for Disease Control and Prevention recommends checking Chagas serologies if endemic area exposure is present, as Trypanosoma cruzi destroys myenteric plexus neurons causing acquired megacolon with functional obstruction 1

Imaging Studies

• The American College of Radiology recommends beginning with plain abdominal radiographs (upright or decubitus) to detect free air, bowel dilation, and fecal loading, though sensitivity is only 74% for obstruction 2, 4
• The American College of Radiology suggests proceeding to CT scan with IV contrast if clinical suspicion persists after normal radiographs, as CT has 90% diagnostic accuracy for bowel obstruction and can detect small amounts of free air, bowel wall thickening, and transition zones 2, 4
• The World Journal of Emergency Surgery recommends considering ultrasound in children and pregnant women to limit radiation exposure, though this should not be considered definitive for excluding pneumoperitoneum 3

Differential Diagnosis and Management

• The World Journal of Emergency Surgery suggests that mechanical obstruction of the transverse and descending colon can be caused by adhesions (post-surgical), strictures (inflammatory bowel disease, ischemic, post-traumatic), volvulus, or neoplasia 5
• The American College of Gastroenterology recommends initiating conservative management with nil per os, nasogastric decompression, IV fluid resuscitation, and electrolyte correction for partial obstruction without peritonitis 2
• The American College of Surgeons suggests proceeding to urgent surgical intervention if signs of peritonitis, bowel ischemia/strangulation, complete obstruction failing to progress after 72 hours, or CT findings of closed-loop obstruction are present 2
• The European Crohn’s and Colitis Organisation recommends treating active distal colitis with topical mesalazine or topical steroid combined with oral mesalamine or corticosteroids 6
• The European Crohn’s and Colitis Organisation suggests admitting for IV therapy if severe disease is present (meeting Truelove and Witts' criteria) or if oral treatment fails 6
• The American College of Gastroenterology recommends performing digital disimpaction followed by water or oil retention enema for distal impaction 4
• The American College of Gastroenterology suggests administering oral polyethylene glycol (PEG) after partial distal clearance, or using PEG lavage for proximal impaction without complete obstruction 4
• The American College of Gastroenterology recommends implementing maintenance bowel regimen with osmotic laxatives (PEG, lactulose) or stimulant laxatives (senna, bisacodyl) to prevent recurrence 4
• The World Health Organization suggests confirming diagnosis of Chagas disease with Chagas serologies in patients with endemic area exposure and chronic constipation 1
• The World Health Organization recommends managing Chagas disease conservatively initially with bowel regimen, though surgical intervention may be required for refractory cases 1