M-ANNHEIM was the first major classification to promote smoking ("N") as a primary independent risk factor for chronic pancreatitis. Smoking acts synergistically with alcohol to accelerate fibrosis and increases the risk of pancreatic adenocarcinoma by 2.5x.
The 'E' Factor (Obstruction)
If Pancreas Divisum or an obstructing stone is the primary "E" factor, patients may benefit from specialized ERCP or surgical decompression (e.g., Puestow procedure).
Clinical Pearls
Autoimmune pancreatitis (I) can often be managed with steroids alone, avoiding surgery
Diabetes in CP is "Type 3c" and is notoriously difficult to manage due to the loss of both insulin AND glucagon cells
Exocrine pancreatic insufficiency (EPI) typically requires a 90% loss of glandular function before steatorrhea becomes clinically apparent
Severity C: PERT (Enzyme) replacement and insulin optimization.
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Severity D-E: Referral for EUS or surgical ductal decompression.
Complementary Tools
Cambridge Classification (Radiological CP)
Rosemont Criteria (EUS CP)
TIGAR-O Etiology System
Section 5
Evidence Appraisal
The Foundational System
The M-ANNHEIM classification of chronic pancreatitis: introduction of a unifying classification system based on a review of previous classifications of the disease.
Schneider A et al. • Pancreas. 2007;35(2):101-19. The comprehensive primary reference.
Developed at the University of Heidelberg, Mannheim, Germany. It was designed to replace the Marseille (1963) and Rome (1988) classifications, which focused too heavily on pathology and ignored the clinical multi-factorial reality of the disease.
