Chronic Pancreatitis

Definition, Etiology & Epidemiology - Pancreas Under Siege

• Definition: Chronic, progressive, irreversible inflammatory disease of the pancreas, characterized by parenchymal fibrosis, ductal changes, and loss of exocrine/endocrine function.
• Etiology:
  • Alcohol abuse: Predominant cause (India: ~60-70%).
  • Tropical pancreatitis: Significant in specific Indian regions.
  • 📌 TIGAR-O classification guides etiological assessment (Toxic-metabolic, Idiopathic, Genetic, Autoimmune, Recurrent/severe AP, Obstructive).
• Epidemiology: Indian prevalence: ~120-140 per 100,000 population. Marked male predominance.

⭐ Alcohol and tropical pancreatitis are the leading causes of chronic pancreatitis in the Indian subcontinent.

Pathophysiology & Clinical Features - Scarred & Sore

• Pathophysiology:

  • Recurrent inflammation & ductal obstruction (stones, strictures) → ↑ intraductal pressure.
  • Progressive pancreatic fibrosis, acinar atrophy, calcification.
  • Neural hypertrophy & perineural inflammation cause chronic pain.
  • Islet cell destruction → endocrine insufficiency (diabetes).

• Clinical Features:

  • Pain: Dominant; severe, persistent epigastric, radiates to back. Postprandial, relieved by leaning forward. 📌
  • Malabsorption: Steatorrhea (bulky, foul stools), weight loss, fat-soluble vitamin (A,D,E,K) deficiency.
  • Diabetes Mellitus (Type 3c): Pancreatogenic; often brittle, late feature.
  • Nausea, vomiting.

⭐ Pain in chronic pancreatitis is often relentless and multifactorial, significantly impacting quality of life and being notoriously difficult to manage effectively.

Diagnosis & Staging - Spotting the Damage

• Imaging First:
  • CT: Calcifications, ductal dilatation, atrophy.
  • MRCP: Ductal map (strictures, stones).
  • EUS: Most sensitive for early changes (parenchymal/ductal).
• Function Tests:
  • Direct: Secretin test (gold standard).
  • Indirect: Fecal elastase-1 (< 200 µg/g indicates insufficiency), serum trypsinogen.
• Severity Staging:
  • Cambridge classification (ERCP/MRCP based).
  • M-ANNHEIM score (multifactorial).

⭐ EUS is the most sensitive imaging modality for detecting early changes of chronic pancreatitis.

Complications of Chronic Pancreatitis - When It Gets Worse

• Pseudocysts: Fluid collections; risk of pain, infection, rupture.
• Biliary obstruction: Jaundice, pruritus, cholangitis.
• Duodenal stenosis/obstruction: Gastric outlet obstruction symptoms.
• Vascular complications:
  • Pseudoaneurysms (e.g., splenic artery).
  • Venous thrombosis (splenic, portal) → sinistral portal hypertension.
• Pancreatic ascites/pleural effusion (due to ductal disruption/fistula).
• Exocrine insufficiency: Steatorrhea, maldigestion, weight loss.
• Endocrine insufficiency: Pancreatogenic diabetes (Type 3c DM).
• Chronic pain: Often severe, debilitating.
• Pancreatic cancer: Risk significantly ↑.

⭐ Splenic vein thrombosis, a known complication, can cause isolated gastric varices (due to sinistral portal hypertension) leading to upper GI bleeding without esophageal varices typically seen in generalized portal hypertension.

Management (Medical, Endo, Surgical) - Taming the Flame

• Medical Management:
  • Pain: Analgesia (WHO ladder), adjuncts (pregabalin).
  • Exocrine: PERT (25,000-40,000 U lipase/meal). Low-fat diet.
  • Lifestyle: Alcohol/smoking cessation.
• Endoscopic Therapy (ET):
  • Indications: MPD stones, dominant strictures.
  • Procedures: ERCP (sphincterotomy, stone removal, stenting).
  • Pain: Celiac Plexus Neurolysis (CPN).
• Surgical Therapy:
  • Indications: Intractable pain, complications (obstruction, malignancy suspicion), failed med/endo.
  • Drainage (MPD >6-7mm): Puestow (LPJ), Frey (LPJ + head coring).
  • Resection (head mass, non-dilated duct): Whipple, Beger, Distal Pancreatectomy.

⭐ Frey procedure combines pancreatic head excavation with lateral pancreaticojejunostomy, ideal for painful chronic pancreatitis with inflammatory head mass & dilated MPD.

High‑Yield Points - ⚡ Biggest Takeaways

• Most common cause: Alcohol abuse; tropical pancreatitis also significant in India.
• Hallmark symptom: Chronic epigastric pain radiating to the back, often postprandial.
• Classic triad: Pancreatic calcification (pathognomonic), steatorrhea, and diabetes mellitus (late).
• Diagnosis: CT scan is gold standard (calcifications, ductal changes); MRCP for ductal anatomy.
• Key complications: Pseudocysts, biliary/duodenal obstruction, splenic vein thrombosis, pancreatic cancer risk ↑.
• Surgical indications: Intractable pain, failed medical/endoscopic therapy, or complications. Frey's procedure is common.