Classification and Management of Acute Pancreatitis

Introduction to Classification Systems

The American College of Gastroenterology recommends using the Revised Atlanta Classification 2012 (RAC) or the Determinant-Based Classification (DBC) to stratify the severity of acute pancreatitis, as they are superior to the 1992 Atlanta classification in predicting mortality, ICU admission, and length of stay 1

The RAC categorizes acute pancreatitis into three levels: mild, moderately severe, and severe, based on the presence of organ failure and local or systemic complications, and it correlates well with clinical outcomes, including hospital stay, need for ICU admission, and mortality 1
The DBC adds a fourth category "critical", based on two main determinants of mortality: (peri)pancreatic necrosis and organ failure, and it identifies the most severe disease, particularly when infected necrosis with organ failure is present, with a mortality rate of 32-35.2% 1, 2

The presence of persistent organ failure for more than 48 hours defines severe acute pancreatitis and carries a mortality risk of approximately one in three patients, with a mortality rate of 19.8-35.2% if symptoms have persisted for more than 48 hours 1, 3
Persistent oliguria (<0.5 ml/kg/hour) indicates renal failure and defines severe disease 3

The severity stratification should be performed in all patients within the first 48 hours, using the Glasgow score and C-reactive protein (CRP) levels, and a peak CRP level >210 mg/l within the first four days of the attack has a predictive performance similar to objective systems, with an overall accuracy of 80% 4
The APACHE II score can be used for initial evaluation, and a score of 9 or more indicates a severe attack, while a score of 6 or more will include almost all complications (sensitivity 95%) 4

All patients with predicted severe attack should undergo dynamic contrast-enhanced computed tomography (CT) between 3 and 10 days after admission, and CT should be repeated every 2 weeks or more frequently if sepsis is suspected 4, 2

All cases of severe acute pancreatitis require management in an intermediate or intensive care unit with complete monitoring and system support, and persistent organ dysfunction despite adequate fluid resuscitation that requires specific organ support necessitates ICU admission 2
The American College of Gastroenterology recommends not relying solely on the severity of pain to evaluate the severity of the disease, not missing the 48-hour window for severity stratification, not overlooking biliary symptoms that require urgent ERCP, and not failing to identify patients who need transfer to the ICU 3, 2