Gastrointestinal · Year 2 · from Gastrointestinal
Case 2: Chronic Pancreatitis with Exocrine Insufficiency
Patient Presentation
Demographics: 48-year-old male
Chief Complaint: Chronic abdominal pain, weight loss, and greasy stools for 6 months
History of Present Illness: The patient has a long history of recurrent episodes of epigastric pain requiring hospitalization, diagnosed as acute pancreatitis. Over the past 6 months, he has developed persistent, gnawing epigastric pain that worsens after eating. He reports unintentional weight loss of 25 pounds despite maintaining appetite. He describes his stools as loose, foul-smelling, greasy, pale, and difficult to flush. He has also developed new-onset diabetes requiring insulin therapy 3 months ago.
Past Medical History: Multiple hospitalizations for acute pancreatitis (5 episodes over 10 years), new-onset diabetes mellitus, hypertension
Social History: 30-year history of heavy alcohol use (8-10 beers daily); quit alcohol 6 months ago; 1 pack-per-day smoker for 25 years
Physical Examination
- Vital Signs: Temperature 36.8C, BP 118/72 mmHg, HR 78 bpm
- General: Thin, cachectic male appearing older than stated age
- Abdomen: Epigastric tenderness without peritoneal signs; no organomegaly
- Extremities: Thin muscle bulk, no edema
Workup and Results
- CBC: Hemoglobin 10.8 g/dL, MCV 102 fL (macrocytic anemia)
- BMP: Glucose 285 mg/dL, normal creatinine
- Liver Function Tests: Normal
- Lipase: Normal (burned-out gland)
- HbA1c: 9.8%
- Fecal Elastase: 85 micrograms/g (severely reduced; normal > 200)
- Fat-Soluble Vitamins: Vitamin D 12 ng/mL (low), Vitamin A 18 mcg/dL (low)
- CT Abdomen: Diffuse pancreatic calcifications throughout the gland; main pancreatic duct dilation (7 mm) with "chain of lakes" appearance; glandular atrophy
- MRCP: Dilated main pancreatic duct with strictures and dilations consistent with chronic pancreatitis
Diagnosis
Chronic Pancreatitis with Pancreatic Exocrine Insufficiency (TIGAR-O: Toxic-Metabolic - Alcohol)
Clinical Correlation
This case demonstrates the progression from recurrent acute alcoholic pancreatitis to chronic pancreatitis with irreversible structural damage. Alcohol accounts for approximately 70% of chronic pancreatitis cases in Western countries. The classic clinical triad includes chronic epigastric pain, steatorrhea (when > 90% of exocrine function is lost), and diabetes mellitus (due to islet cell destruction).
Key diagnostic findings include:
- Fecal elastase < 200 micrograms/g: Confirms exocrine insufficiency (< 100 indicates severe insufficiency)
- Pancreatic calcifications on CT: Highly specific for chronic pancreatitis
- Chain of lakes appearance on MRCP: Alternating strictures and dilations of the main pancreatic duct
- New-onset "brittle" diabetes: Results from destruction of both beta cells (insulin deficiency) and alpha cells (glucagon deficiency), causing unpredictable glycemic swings
The "burned-out" gland phenomenon explains the normal lipase: progressive fibrosis destroys acinar cells, reducing enzyme production even during inflammatory episodes.
Treatment
- Absolute alcohol abstinence and smoking cessation - essential to slow progression
- Pain management: Start with non-opioids; consider pancreatic enzyme supplementation for pain (may reduce CCK-mediated pancreatic stimulation); avoid opioid dependence
- Pancreatic Enzyme Replacement Therapy (PERT):
- Starting dose: 40,000-50,000 lipase units with meals, 25,000 with snacks
- Take at the beginning of or during meals
- Add PPI to optimize enzyme activity
- Dietary modifications: Low-fat diet (< 20 g fat per meal); frequent small meals
- Fat-soluble vitamin supplementation: Vitamins A, D, E, K
- Diabetes management: Insulin therapy; close monitoring due to brittle nature
- Endoscopic therapy consideration: ERCP with dilation and stenting for dominant strictures
- Surgical consultation: Lateral pancreaticojejunostomy (Puestow procedure) for dilated duct disease if medical management fails