Acute Pancreatitis
3x ULN
Lipase Diagnostic
More specific than amylase
1
Nutrition Priority
Early enteral preferred over TPN
2
Main Causes
Gallstones and alcohol
Diagnosis and Etiology
Diagnosis requires two of three criteria. Characteristic abdominal pain (epigastric radiating to the back). Lipase or amylase elevated to ≥3 times the upper limit of normal. Imaging findings consistent with pancreatitis. The two most common causes are gallstones and alcohol, accounting for roughly 80% of cases.
Early enteral nutrition is preferred over TPN. The gut needs to work to heal. Ranson's criteria and APACHE II scores help predict severity at admission and 48 hours.
Management Priorities
Aggressive IV hydration Lactated Ringer's preferred, goal-directed to urine output and hemodynamic markers
Pain management IV opioids as needed, patient-controlled analgesia for severe cases
Early enteral nutrition Oral diet or nasojejunal feeds within 24-48 hours if tolerated
ERCP if indicated For gallstone pancreatitis with cholangitis or persistent biliary obstruction
Monitor for complications Necrosis, pseudocyst, abscess, organ failure, SIRS progression
Key Values to Memorize
Lipase ≥3x ULN diagnostic
Lipase > amylase specificity
#1 gallstones #2 alcohol
Early enteral > TPN
ERCP for gallstone + cholangitis
LR preferred for hydration
pancreatitis management has changed, know the current evidence
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Practice CCRN QuestionsExam Traps
Lipase is more specific than amylase for pancreatitis
Both lipase and amylase are elevated in acute pancreatitis, but lipase is more specific. Amylase can be elevated in many other conditions (salivary gland disease, bowel obstruction, renal failure, macroamylasemia). Lipase also stays elevated longer (up to 14 days vs 3-5 days for amylase), making it useful in delayed presentations.
Early enteral nutrition is preferred over TPN
The old teaching of "bowel rest and NPO" for pancreatitis has been replaced. Current evidence shows that early enteral nutrition (within 24-48 hours, ideally via oral or nasojejunal tube) maintains gut barrier function, reduces infectious complications, and shortens hospital stays. TPN is reserved for patients who cannot tolerate enteral feeding.
The morphine and sphincter of Oddi debate is largely historical
The classic teaching was to avoid morphine because it "causes sphincter of Oddi spasm." Current evidence suggests this effect is clinically insignificant. Hydromorphone is often preferred but morphine is not absolutely contraindicated. The exam may still reference this concern, so know it exists but understand the nuance.
ERCP is indicated for gallstone pancreatitis with biliary obstruction
If gallstone pancreatitis is complicated by cholangitis (fever, jaundice, RUQ pain = Charcot triad) or persistent biliary obstruction, ERCP with sphincterotomy and stone extraction is indicated within 24-72 hours. Not all gallstone pancreatitis needs ERCP. Only those with obstruction or cholangitis.
Feed the Gut
Early enteral nutrition is the standard. The gut needs to work to heal. TPN is the backup plan, not the first choice.
Lipase Over Amylase
Lipase is more specific, stays elevated longer, and is the preferred diagnostic marker. Amylase has too many other causes.
The pancreas is a factory that produces powerful digestive enzymes (lipase, amylase, trypsin). Normally, these enzymes are produced in inactive forms and only activate when they reach the small intestine. The factory has safety locks to prevent the enzymes from activating while still inside.
In acute pancreatitis, the safety locks fail. Enzymes activate inside the factory and start digesting the pancreas itself. Gallstones block the exit duct (back-pressure activates enzymes). Alcohol directly damages the factory cells. Either way, the factory is now being destroyed by its own products.
As the factory walls break down, enzymes and inflammatory mediators spill into the surrounding area. This causes local tissue damage, fluid sequestration (third-spacing), and systemic inflammation. Severe cases can lead to necrosis, infection, organ failure, and SIRS.
Treatment is supportive. Aggressive IV hydration replaces the fluid lost to third-spacing. Pain management keeps the patient comfortable. Early enteral nutrition maintains gut integrity and prevents bacterial translocation. The factory rebuilds itself if given time and support.
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