Sudden inflammation of the pancreas, most often from gallstones or alcohol; severity-driven management.
Also known as: acute pancreatitis, gallstone pancreatitis, alcoholic pancreatitis
Overview
Acute inflammatory process of the pancreas with potential involvement of peripancreatic tissues or remote organ systems. Diagnosed by ≥2 of: characteristic abdominal pain, lipase or amylase ≥3× upper limit of normal, or characteristic imaging findings.
Epidemiology
Incidence 30-50 per 100,000/yr in the US; rising. Mortality 1-3% overall; up to 20% in severe necrotizing disease. Most common GI cause of hospital admission.
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Premature intra-acinar activation of trypsinogen to trypsin initiates auto-digestion of pancreatic tissue. Local inflammatory cascade and release of cytokines drive edema, hemorrhage, fat necrosis, and pancreatic/peripancreatic necrosis. Systemic inflammatory response (SIRS) and multiorgan dysfunction occur in severe disease.
Clinical presentation
Symptoms
Sudden, severe epigastric pain radiating to the back, often constant
Pain relieved by leaning forward, worse supine
Nausea and vomiting (often persistent)
Anorexia
Fever (mild; high fever suggests cholangitis or necrosis with infection)
Revised Atlanta Classification (2012): diagnosis requires 2 of 3: (1) typical abdominal pain; (2) lipase/amylase ≥3× ULN; (3) characteristic imaging. Severity: Mild (no organ failure, no local/systemic complications), Moderate (transient organ failure <48 h or local/systemic complications), Severe (persistent organ failure ≥48 h).
Labs
LIPASE (preferred) or amylase — elevation ≥3× ULN supports diagnosis; lipase more specific and remains elevated longer
CBC — hematocrit (hemoconcentration from third-spacing); WBC
Calcium — hyper- (cause) or hypocalcemia (complication)
Lactate if severe
ABG, lactate dehydrogenase for severity scoring (Ranson, APACHE)
CRP at 48 h — >150 predicts severe disease
Imaging
Abdominal ultrasound — FIRST imaging in all patients to exclude gallstones (etiology), not for severity
CT abdomen with IV contrast — NOT required at presentation if diagnosis is clinical; obtain at 72 h or later to stratify severity and identify necrosis, peripancreatic collections; earlier CT if diagnosis unclear or rapid deterioration
MRI/MRCP — if CT contraindicated or CBD stone suspected
EUS — recurrent idiopathic pancreatitis evaluation
Diagnostic algorithm
BISAP Criterion (0-5)
Threshold
B — BUN
>25 mg/dL
I — Impaired mental status
GCS <15
S — SIRS
≥2 criteria
A — Age
>60 yr
P — Pleural effusion
Present on imaging
Score interpretation
≥3 = high risk for severe pancreatitis and mortality
BISAP score — bedside index for severity in acute pancreatitis (Wu et al., Gut 2008).
Treatment
First-line
Aggressive IV fluid resuscitation — lactated Ringer's at 5-10 mL/kg/h titrated to urine output >0.5 mL/kg/h and clinical response; avoid over-resuscitation (worsens outcomes)
Pain control — IV opioids (hydromorphone, fentanyl)
Antiemetics, NPO initially but early oral feeding (low-fat soft diet) within 24-48 h as tolerated improves outcomes
Identify and treat etiology
Monitor in step-down or ICU based on severity
Gallstone pancreatitis
Same-admission cholecystectomy for mild disease (PONCHO trial) to prevent recurrence
Delay cholecystectomy 4-6 weeks for severe disease until inflammation resolves
ERCP only if concurrent cholangitis or persistent obstruction
Alcohol-induced pancreatitis
Alcohol cessation counseling; treat withdrawal
Nutritional support (thiamine, folate, multivitamin)
Smoking cessation (synergistic risk for chronic pancreatitis)
Hypertriglyceridemic pancreatitis
IV insulin infusion (lowers TG) ± plasmapheresis if TG >1000 with end-organ damage
Control underlying diabetes, alcohol, OCP, estrogens, beta-blockers
Second-line / adjunct
Enteral nutrition (nasogastric or nasojejunal) preferred over TPN in severe disease unable to eat by day 5-7
Antibiotics — NOT routine; reserve for confirmed infected necrosis (positive FNA culture or gas in necrosis) or concurrent extra-pancreatic infection (cholangitis, pneumonia, line sepsis); carbapenem or piperacillin-tazobactam
ERCP within 24-48 h ONLY if concurrent ascending cholangitis or persistent CBD obstruction; not for uncomplicated gallstone pancreatitis
Plasmapheresis or insulin/heparin infusion for hypertriglyceridemic pancreatitis (TG >1000)
Step-up approach for necrotizing pancreatitis: percutaneous drainage → minimally invasive necrosectomy (video-assisted retroperitoneal debridement or endoscopic transluminal) → open necrosectomy as last resort (PANTER trial)
Splenic vein thrombosis with isolated gastric varices
Pseudoaneurysm (especially splenic artery)
Progression to chronic pancreatitis (especially alcohol etiology)
Diabetes mellitus, exocrine insufficiency
PANCE pearls
Lipase >3× ULN is more specific than amylase and remains elevated longer.
Magnitude of lipase does NOT correlate with severity.
ALT >150 strongly suggests gallstone etiology — pursue RUQ ultrasound.
DO NOT routinely give prophylactic antibiotics for sterile necrosis — only for infected necrosis or extra-pancreatic infection.
Aggressive IV fluids in the first 24 h reduce mortality; lactated Ringer's reduces SIRS compared with normal saline (Wu, Clin Gastroenterol Hepatol 2011).
Same-admission cholecystectomy for mild gallstone pancreatitis (PONCHO trial).
Early enteral feeding within 24-48 h improves outcomes vs prolonged NPO.
Step-up approach (drainage first, surgery last) reduces morbidity in necrotizing pancreatitis (PANTER trial).
Revised Atlanta Classification: mild, moderate, severe — severity determined by organ failure (Marshall score) and complications.
BISAP score (BUN >25, impaired mental status, SIRS ≥2, age >60, pleural effusion) — practical early severity score.
ERCP urgent only for concurrent cholangitis or persistent obstruction — not for uncomplicated gallstone pancreatitis.
References
ACG 2013 — Tenner S et al. American College of Gastroenterology Guideline: Management of Acute Pancreatitis. Am J Gastroenterol 2013;108:1400-1415
Revised Atlanta — Banks PA et al. Classification of acute pancreatitis—2012: revision of the Atlanta classification and definitions. Gut 2013;62:102-111
PANTER Trial — van Santvoort HC et al. A Step-up Approach or Open Necrosectomy for Necrotizing Pancreatitis. NEJM 2010;362:1491-1502
PONCHO Trial — da Costa DW et al. Same-admission versus interval cholecystectomy for mild gallstone pancreatitis. Lancet 2015;386:1261-1268
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