Acute Pancreatitis vs Small Bowel Obstruction
Acute Pancreatitis and Small Bowel Obstruction are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Acute Pancreatitis vs Small Bowel Obstruction at a glance
- Acute Pancreatitis: Sudden inflammation of the pancreas, most often from gallstones or alcohol; severity-driven management.
- Small Bowel Obstruction: Mechanical blockage of small bowel; adhesions are the most common cause in adults with prior surgery.
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Side-by-side comparison
| Feature | Acute Pancreatitis | Small Bowel Obstruction |
|---|---|---|
| At a glance | Sudden inflammation of the pancreas, most often from gallstones or alcohol; severity-driven management. | Mechanical blockage of small bowel; adhesions are the most common cause in adults with prior surgery. |
| Classic presentation | Sudden epigastric pain radiating to back with markedly elevated lipase (>3× ULN) in a patient with gallstones or alcohol use.; Sudden, severe epigastric pain radiating to the back, often constant; Pain relieved by leaning forward, worse supine; Nausea and vomiting (often persistent); Anorexia; Fever (mild; high fever suggests… | Crampy abdominal pain + vomiting + distension + obstipation in a patient with prior abdominal surgery.; Crampy, intermittent abdominal pain (initially every 4-5 min in proximal SBO; longer intervals in distal); Nausea and vomiting (early and bilious in proximal; feculent in distal SBO); Abdominal distension (more pronounced in distal… |
| Workup / key labs | Revised Atlanta Classification (2012): diagnosis requires 2 of 3: (1) typical abdominal pain; (2) lipase/amylase ≥3× ULN; (3) characteristic imaging. Severity: Mild (no organ failure, no local/systemic complications), Moderate (transient organ failure <48 h or local/systemic complications), Severe (persistent organ failure ≥48 h).;… | Clinical features + imaging findings. CT signs of strangulation: bowel wall thickening, mesenteric edema, ascites, lack of contrast enhancement, pneumatosis intestinalis, portal venous gas.; CBC — leukocytosis suggests strangulation; BMP — hypokalemia, hypochloremia, metabolic alkalosis from vomiting; Lactate — elevated in… |
| Imaging | Abdominal ultrasound — FIRST imaging in all patients to exclude gallstones (etiology), not for severity; CT abdomen with IV contrast — NOT required at presentation if diagnosis is clinical; obtain at 72 h or later to stratify severity and identify necrosis, peripancreatic collections; earlier CT if diagnosis unclear or rapid… | Upright and supine abdominal radiograph — historically first; air-fluid levels, dilated small bowel loops (>3 cm), 'string of pearls,' paucity of colonic gas (but limited sensitivity); CT abdomen/pelvis with IV contrast — MODALITY OF CHOICE; identifies transition point, cause (hernia, mass, intussusception, volvulus), closed loop, signs… |
| First-line treatment | Aggressive IV fluid resuscitation — lactated Ringer's at 5-10 mL/kg/h titrated to urine output >0.5 mL/kg/h and clinical response; avoid over-resuscitation (worsens outcomes); Pain control — IV opioids (hydromorphone, fentanyl); Antiemetics, NPO initially but early oral feeding (low-fat soft diet) within 24-48 h as tolerated improves… | NPO, nasogastric tube decompression for symptomatic relief; IV fluid resuscitation (lactated Ringer's preferred); Correct electrolyte and acid-base derangements; Analgesia, antiemetics; Foley catheter for accurate I/O monitoring; Broad-spectrum IV antibiotics if signs of infection, strangulation, or perforation suspected; Surgical… |
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