Acute and Chronic Pancreatitis: Diagnosis and Management Essentials

I. Acute Pancreatitis

1. Diagnosis

Based on Revised Atlanta Criteria (2012) — diagnosis requires ≥2 of 3:

1. Typical abdominal pain: Acute, severe, epigastric pain radiating to the back.
2. Serum amylase/lipase ≥3× ULN (lipase more specific).
3. Imaging (CT/MRI/US) showing pancreatitis (pancreatic enlargement, peripancreatic fluid, fat stranding).

2. Severity Classification (Atlanta 2012)

• Mild: No organ failure, no complications.
• Moderately severe: Transient organ failure (<48 hr) or local complications.
• Severe: Persistent organ failure (>48 hr).

3. Management

A. Initial Measures (First 24–48 hr, inpatient)

• IV hydration:
  • Lactated Ringer’s preferred (better than NS).
  • Bolus: 15–20 mL/kg if hypovolemic → Maintenance ~3 mL/kg/hr.
  • Goals: HR <120, MAP ≥65 mmHg, UO ≥0.5 mL/kg/hr, falling BUN.
• Pain control: IV opioids (morphine, hydromorphone, fentanyl).
• NPO initially → early enteral feeding (NG/NJ tube) once stable.
• Oxygen & monitoring: Pulse ox, urine output, vitals.

B. Etiology-specific interventions

• Gallstone pancreatitis: ERCP if cholangitis or persistent obstruction.
• Alcohol-induced: Strict abstinence.
• Hypertriglyceridemia-induced: IV insulin ± plasmapheresis.

C. Avoid routine antibiotics unless infection/necrosis is proven.

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II. Chronic Pancreatitis

1. Diagnosis

• Clinical: Recurrent epigastric pain ± malabsorption, steatorrhea, diabetes.
• Labs: Amylase/lipase often normal or mildly elevated (not reliable).
• Imaging:
  • CT/MRI: Calcifications, ductal dilatation, pancreatic atrophy.
  • MRCP/EUS: Early disease, ductal irregularities.
• Stool elastase <200 μg/g → exocrine insufficiency.
• Time Course:
  • Usually recurrent episodes of pancreatitis for >6 months.
  • Multiple attacks: Not a strict number, but typically >3–4 attacks within 6–12 months, especially if accompanied by progressive damage (calcification, ductal changes, exocrine insufficiency).
  • After repeated injury, the pancreas no longer returns to baseline → evolves into chronic pancreatitis.

2. Management

A. Lifestyle

• Absolute alcohol and smoking cessation.
• Low-fat diet, small frequent meals.

B. Pain control

• Stepwise: NSAIDs/acetaminophen → tramadol → opioids.
• Adjuncts: Pregabalin, duloxetine, TCAs.
• Celiac plexus block if refractory.
• Endoscopic or surgical decompression (Puestow, Frey, Whipple) if duct obstruction.

C. Exocrine insufficiency

• Pancreatic enzyme replacement therapy (PERT): Pancrelipase (25,000–50,000 lipase units with meals).
• Supplement fat-soluble vitamins (A, D, E, K).

D. Endocrine insufficiency

• Type 3c diabetes → usually requires insulin.

E. Surveillance & Complications

• Pancreatic cancer, biliary obstruction, pseudocyst, malnutrition, osteoporosis.

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III. Acute on Chronic Pancreatitis

• Definition: A patient with chronic pancreatitis (fibrotic, scarred pancreas) develops an acute inflammatory flare.
• Clinically → presents exactly like acute pancreatitis (severe epigastric pain, ↑amylase/lipase, systemic inflammation).
• Diagnosis: Use same Atlanta criteria (≥2 of 3).
• Management: Same as acute pancreatitis in the acute setting:
  • Admit, IV fluids (LR), opioid analgesia, NPO initially, early enteral nutrition.
  • Investigate triggers (alcohol, gallstones, hypertriglyceridemia).

⚠️ Difference: After stabilization → still requires chronic pancreatitis long-term management (PERT, diabetes control, pain prevention, lifestyle).

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IV. Key Exam Pearls

• Acute pancreatitis = “2 out of 3 rule” + aggressive IV hydration.
• Chronic pancreatitis = enzymes often normal; diagnosis relies on imaging.
• Acute on chronic pancreatitis = treat acute flare just like acute pancreatitis, but address chronic disease afterward.
• Intractable pain despite meds → escalate to endoscopic/surgical interventions.
• Always rule out pancreatic cancer in chronic pancreatitis with mass lesions.