Acute Pancreatitis

Acute pancreatitis is the most common gastrointestinal-related reason for hospitalization in the United States, with approximately 300,000 ED visits annually. [1-2] Diagnosis requires 2 of 3 revised Atlanta criteria: (1) abdominal pain consistent with the disease, (2) serum amylase and/or lipase >3× the upper limit of normal, and (3) characteristic findings on cross-sectional imaging. [1][3] Approximately 80% of cases can be diagnosed on clinical and laboratory findings alone without imaging. [1]

The following figure from JAMA illustrates the timeline, manifestations, and management of acute pancreatitis stratified by severity:

• Pain characterization: Constant epigastric or LUQ pain, often radiating to the back, chest, or flanks; exacerbated by eating, drinking, or lying supine [1][3]
• Dull, colicky, or lower abdominal pain is not consistent with acute pancreatitis and suggests an alternative diagnosis [3]
• Pain intensity does not correlate with severity [3]
• Accompanying symptoms: nausea, vomiting, low- to moderate-grade fever [1]
• Timing: Onset typically acute; ask about prior episodes, recent heavy meals, alcohol binge
• Key HPI questions:
  • History of gallstones, biliary colic, or prior cholecystectomy
  • Alcohol use: quantity, duration (>5 years of heavy use for alcohol-related AP) [3-4]
  • Recent ERCP or EUS (5–10% and <1% risk, respectively) [1]
  • New medications within the past weeks to months [1][5]
  • Recent infections, trauma, insect bites [1]
  • Hypertriglyceridemia history, hypercalcemia, pregnancy

• Persistent organ failure >48 hours (defines severe AP): SBP <90 mmHg, PaO₂ <60 mmHg, creatinine >2 mg/dL, GI bleeding >500 mL/24h [3]
• SIRS at admission — highly predictive of organ failure and severe disease [3]
• Altered mental status [3]
• Hemoconcentration (HCT ≥44%) or rising BUN (≥20 mg/dL) within 24 hours [3]
• Pleural effusions or infiltrates on CXR [3]
• Signs of abdominal compartment syndrome (tense distension, oliguria, respiratory failure)
• Grey Turner sign (flank ecchymosis) or Cullen sign (periumbilical ecchymosis) — rare but suggest hemorrhagic pancreatitis
• Fever >101°F with clinical deterioration after 7–10 days — suspect infected necrosis [3]

Causative medications (>30 drugs with definite association): [1][4]

• Highest evidence: azathioprine, 6-mercaptopurine, didanosine, valproic acid, ACE inhibitors (enalapril, perindopril), mesalamine/sulfasalazine
• Other notable agents: furosemide, tetracycline, TMP-SMX, statins (simvastatin, rosuvastatin, pravastatin), carbamazepine, estrogens, metronidazole, isoniazid
• Drug-induced pancreatitis is usually mild and resolves with drug discontinuation [4]
• GLP-1 receptor agonists: recent data do not support a causal role [4]

Treatment medications

• Analgesia: Multimodal approach per WHO pain ladder; opioids are appropriate and may decrease supplementary analgesic need. No particular analgesic is superior [6]
• IV fluids: Lactated Ringer solution preferred [1][3]
• Antiemetics: Ondansetron, prochlorperazine as needed
• Prophylactic antibiotics are NOT recommended routinely in predicted severe AP or necrotizing pancreatitis [7]

Contraindicated/caution

• Avoid NSAIDs if renal impairment or hemodynamic instability
• Discontinue any suspected causative medication immediately

• Early oral feeding (within 24 hours) as tolerated is recommended — no need to wait for pain resolution or enzyme normalization [2][7]
• Low-fat solid diet is preferred over clear liquids (no benefit to gradual advancement) [2]
• If oral feeding not tolerated: nasogastric or nasojejunal enteral feeding preferred over parenteral nutrition [2][7]
• Parenteral nutrition reserved for patients who cannot tolerate enteral feeding
• Long-term: Alcohol cessation is critical; low-fat diet for hypertriglyceridemia-related AP; fibrate therapy for TG >1000 mg/dL

• GI: Nausea, vomiting, anorexia, abdominal distension, diarrhea/steatorrhea (suggests chronic component)
• Pulmonary: Dyspnea, pleuritic chest pain (pleural effusion, ARDS)
• Cardiovascular: Chest pain, palpitations (ECG changes can mimic ACS) [8-9]
• Renal: Decreased urine output (hypovolemia, AKI)
• Neurologic: Altered mental status (component of BISAP; suggests severe disease) [1]
• Constitutional: Fevers, chills, diaphoresis, weight loss

• Alcohol use: Confirm quantity and duration with family/friends; >50 g/day for >5 years required for alcohol-related AP [3-4]
• Family history: Hereditary pancreatitis (PRSS1, SPINK1, CFTR mutations) — consider if recurrent AP without identifiable cause [1]
• Social context: Smoking (independent risk factor and cofactor with alcohol); recreational drug use (cannabis has been implicated) [1][3]
• Prior episodes of pancreatitis or known chronic pancreatitis

• Gallstones (40–70% of cases) — most common cause [3]
• Alcohol (25–35%) — requires prolonged heavy use; lifetime risk in heavy drinkers only 2–5% [3-4]
• Hypertriglyceridemia (2–5%) — typically TG >1000 mg/dL; up to 56% of AP in pregnancy [3]
• Obesity — independent risk factor for severe disease [1]
• Older age [1]
• Smoking [3]
• Post-ERCP (5–10%) [1]
• Medications (<5% of cases) [4]
• Hypercalcemia, autoimmune disease, infections, trauma, genetic predisposition [1][6]
• Pancreatic cancer should be suspected in any patient >40 years with idiopathic AP [3]

• Perforated peptic ulcer — sudden onset, peritoneal signs, free air on imaging [1]
• Acute cholecystitis/cholangitis — RUQ pain, Murphy sign, Charcot triad
• Mesenteric ischemia — pain out of proportion to exam, lactic acidosis, atrial fibrillation
• Small bowel obstruction — colicky pain, distension, vomiting, prior surgery
• Acute myocardial infarction — AP can mimic inferior STEMI on ECG; obtain troponin if chest pain present [8]
• Ruptured/dissecting aortic aneurysm — tearing pain, hemodynamic instability
• Diabetic ketoacidosis — can cause elevated lipase and abdominal pain without true pancreatitis
• Ectopic pregnancy (reproductive-age women)

• Prior episodes of pancreatitis (recurrence risk: biliary > alcohol > HTG) [10]
• Known gallstone disease or prior cholecystectomy
• Chronic pancreatitis (alcohol-related AP often represents flare on chronic disease) [4]
• Hypertriglyceridemia, hypercalcemia, hyperparathyroidism
• Autoimmune conditions (IgG4-related disease)
• HIV status (increased risk; also drug-related causes) [1]
• Pancreatic cysts, tumors, or structural anomalies (pancreas divisum)
• Prior abdominal surgery

• Vitals: Tachycardia, hypotension (hypovolemia), fever, tachypnea
• Abdomen: Epigastric tenderness, guarding, distension, decreased bowel sounds; rebound tenderness is uncommon [1]
• Skin: Jaundice (biliary obstruction); Grey Turner sign (flank ecchymosis) and Cullen sign (periumbilical ecchymosis) — rare, late findings of hemorrhagic pancreatitis
• Lungs: Decreased breath sounds at bases (pleural effusion, especially left-sided)
• Cardiovascular: Assess volume status — capillary refill, JVP, peripheral perfusion
• Mental status: Altered mentation is a BISAP component and red flag [1]

Diagnostic

• Serum lipase (preferred over amylase) — >3× ULN is diagnostic. Amylase may be normal in alcohol-induced or hypertriglyceridemia-related AP [3]
• Comprehensive metabolic panel: BUN, creatinine (volume status, renal function), glucose, calcium
• Hepatic panel: ALT, AST, alkaline phosphatase, total/direct bilirubin — elevated ALP/direct bilirubin suggests choledocholithiasis [1]
• Serum triglycerides — obtain on all patients; >1000 mg/dL suggests HTG as etiology [3]
• CBC: Leukocytosis; HCT ≥44% suggests hemoconcentration [3]

Severity markers

• BUN ≥20 mg/dL at admission or rising BUN at 24h — associated with increased mortality (OR 4.6 and 4.3, respectively) [1]
• CRP >150 mg/L at 48–72h predicts necrosis [3][11]
• Lactate if concern for shock or mesenteric ischemia

Other

• IgG4 if autoimmune pancreatitis suspected [1]
• Fasting TG level 1 month post-discharge if HTG suspected [3]
• Genetic testing for recurrent idiopathic AP [1]

• Transabdominal ultrasound — obtain on all patients to evaluate for gallstones; first-line imaging [3][6]
• CT abdomen/pelvis with IV contrast — not required for diagnosis if clinical/lab criteria met; indicated for:
  • Diagnostic uncertainty or failure to improve within 48–72 hours [1][6]
  • Suspected complications (necrosis, abscess, vascular complications)
  • CECT may underestimate severity if obtained <72 hours from symptom onset [1]
• MRI/MRCP — useful for evaluating bile duct stones, pancreatic duct anatomy, and in patients with contrast allergy or renal insufficiency
• Chest X-ray — assess for pleural effusion (BISAP component), ARDS [3]
• Imaging is unnecessary in straightforward mild AP with clear etiology and clinical improvement

Scoring systems (all have similar predictive accuracy; none is clearly superior): [1][12]

• BISAP (Bedside Index for Severity in Acute Pancreatitis) — most practical for ED use; calculated within 24 hours: [1]
  • BUN >25 mg/dL
  • Impaired mental status
  • SIRS
  • Age >60
  • Pleural effusion
  • Score ≥3: OR 7.4 for organ failure, OR 12.7 for persistent organ failure, >20% mortality [1]
• Ranson criteria — requires 48 hours to complete; 11 variables [1]
• APACHE II — comprehensive but cumbersome; 12 variables [1]
• Modified Marshall Score — defines organ failure (respiratory, renal, cardiovascular) [1][3]
• CT Severity Index — useful after 72 hours for assessing necrosis extent [1]

Point-of-care

• Bedside ultrasound for gallstones, free fluid, IVC assessment for volume status
• SIRS assessment at admission — highly sensitive for predicting severe disease [2-3]

• ~50% of patients with AP have ECG abnormalities [9][13]
• Most common: sinus tachycardia, T-wave flattening, ST-segment depression, nonspecific repolarization changes [9][13]
• Can mimic acute MI: ST-elevation (most commonly inferior leads), peaked T waves — reported in 34 cases without true coronary thrombosis [8][14]
• QTc prolongation seen in ~58% of patients; associated with higher mortality [15]
• Mechanisms: hypovolemia, electrolyte derangements (hypocalcemia, hypokalemia, hypomagnesemia), coronary vasospasm, direct myocyte injury from pancreatic enzymes [8-9]
• Obtain ECG in all patients with chest pain, hemodynamic instability, or significant comorbidities to rule out concurrent ACS
• Obtain troponin if ECG changes are present — true concurrent MI can occur [16]

Severity classification (Revised Atlanta): [1][3][6]

• Mild (~80%): No organ failure, no local/systemic complications. Self-limiting; discharge typically within 1 week
• Moderately severe: Transient organ failure (<48h) and/or local complications (fluid collections, necrosis)
• Severe: Persistent organ failure >48 hours ± local complications. Mortality significant

Morphologic classification

• Interstitial edematous pancreatitis — usually mild
• Necrotizing pancreatitis — sterile vs. infected; infected necrosis carries highest morbidity/mortality [3]

Etiology-specific severity: Hypertriglyceridemia-induced AP has the highest complication rate, followed by alcoholic AP, then biliary AP. [10]

Initial stabilization (ED)

• IV fluid resuscitation: Begin immediately with lactated Ringer solution; goal-directed at 5–10 mL/kg/h until targets met (HR <120, MAP 65–85 mmHg, UOP >0.5–1 mL/kg/h) [1][3][6]
  • Most effective in the first 6–12 hours; after 24–48 hours or in established severe disease, aggressive hydration may be harmful [3]
  • Monitor BUN and HCT — do not allow these to rise in the first 24–48 hours [3]
  • Caution in patients with heart failure or CKD (risk of pulmonary edema, abdominal compartment syndrome) [1]
• Analgesia: Multimodal — acetaminophen, opioids as needed; no evidence one analgesic is superior [6]
• NPO is NOT required: Early oral feeding (low-fat diet) within 24 hours as tolerated [2][7]
• Antiemetics as needed

Etiology-directed interventions

• Gallstone pancreatitis with cholangitis: Urgent ERCP within 24 hours [7]
• Gallstone pancreatitis without cholangitis: ERCP is NOT routinely indicated [7]
• Same-admission cholecystectomy for mild biliary pancreatitis; within 2–4 weeks if unsafe during admission [1][17]
• Hypertriglyceridemia: Insulin infusion ± heparin to lower TG; consider plasmapheresis if TG >1000 with severe metabolic acidosis [18]
• Alcohol-related: Brief alcohol intervention during hospitalization [7]

Infected necrosis (typically >7–10 days)

• Antibiotics (carbapenems have best pancreatic penetration)
• Step-up approach: Percutaneous/endoscopic drainage first → minimally invasive necrosectomy if needed → open surgery as last resort [2][18]

Admission criteria — virtually all patients with confirmed AP require admission:

• All patients meeting diagnostic criteria
• Inability to tolerate oral intake
• Need for IV fluid resuscitation and pain control

ICU admission: [3][19]

• Persistent organ failure (SBP <90, PaO₂ <60, Cr >2 after rehydration)
• Persistent SIRS, hemodynamic instability requiring vasopressors
• BISAP ≥3 or APACHE II ≥8
• Respiratory failure, altered mental status, anuria

Intermediate care/step-down: [19]

Discharge criteria: [1][6][20]

• Pain controlled on oral analgesics
• Tolerating oral diet
• Stable or improving labs (BUN trending down, no rising WBC)
• No signs of organ failure or complications
• Mild AP patients typically discharged within 3–7 days [6]

Specialist consultation triggers

• GI: Biliary pancreatitis (ERCP consideration), recurrent/idiopathic AP, suspected autoimmune pancreatitis
• Surgery: Cholecystectomy planning, necrosectomy, abdominal compartment syndrome
• Interventional radiology: Percutaneous drainage of collections
• ICU/critical care: Organ failure, hemodynamic instability

Follow-up timing

• GI or surgery follow-up within 2–4 weeks post-discharge [1]
• If cholecystectomy deferred: schedule within 2–4 weeks to prevent recurrence [1]
• Repeat fasting TG level at 1 month if hypertriglyceridemia suspected [3]
• Monitor for pancreatic exocrine insufficiency (develops in up to 35%) — check fecal elastase if diarrhea/steatorrhea [1]
• Screen for type 3c (pancreatogenic) diabetes after severe/necrotizing AP [1]

Return precautions — instruct patients to return immediately for:

• Recurrent severe abdominal pain
• Fever, chills, rigors (infected necrosis)
• Persistent vomiting, inability to eat or drink
• Jaundice or dark urine
• Lightheadedness, dizziness, decreased urine output
• Shortness of breath or chest pain

Patient counseling

• Absolute alcohol cessation — critical to prevent recurrence and progression to chronic pancreatitis [1][7]
• Smoking cessation [3]
• Low-fat diet; medication compliance for lipid-lowering therapy if applicable
• Expected recovery: Mild AP typically resolves within 1–2 weeks; moderately severe/severe disease may take weeks to months [1]
• Readmission rate for mild AP is approximately 13%, mainly due to recurrent or ongoing AP [21]

1. Acute Pancreatitis: A Review. — Mederos MA, Reber HA, Girgis MD. The Journal of the American Medical Association. 2021.

2. Acute Pancreatitis: Rapid Evidence Review. — Oppenlander KE, Chadwick C, Carman K. American Family Physician. 2022.

3. American College of Gastroenterology Guidelines: Management of Acute Pancreatitis. — Tenner S, Vege SS, Sheth SG, et al. The American Journal of Gastroenterology. 2024.

4. Acute Pancreatitis. — Forsmark CE, Vege SS, Wilcox CM. The New England Journal of Medicine. 2016.

5. Drug-Induced Pancreatitis: A Real-World Analysis of the FDA Adverse Event Reporting System and Network Pharmacology. — Xie H, Jiang L, Peng J, et al. Frontiers in Pharmacology. 2025.

6. Acute Pancreatitis. — Boxhoorn L, Voermans RP, Bouwense SA, et al. Lancet. 2020.

7. American Gastroenterological Association Institute Guideline On Initial Management of Acute Pancreatitis. — Crockett SD, Wani S, Gardner TB, Falck-Ytter Y, Barkun AN. Gastroenterology. 2018.

8. Acute Pancreatitis and Myocardial Infarction: A Narrative Review. — Khan U, Petrechko O, Sagheer S, et al. Cardiology. 2023.

9. Cardiovascular Manifestations of Acute Pancreatitis. — Yegneswaran B, Kostis JB, Pitchumoni CS. Journal of Critical Care. 2011.

10. Assessment of the Course of Acute Pancreatitis in the Light of Aetiology: A Systematic Review and Meta-Analysis. — Bálint ER, Fűr G, Kiss L, et al. Scientific Reports. 2020.

11. Acute Pancreatitis: Diagnosis and Treatment. — Szatmary P, Grammatikopoulos T, Cai W, et al. Drugs. 2022.

12. Management of Gallstone Pancreatitis: A Review. — McDermott J, Kao LS, Keeley JA, Nahmias J, de Virgilio C. JAMA Surgery. 2024.

13. Electrocardiographic Abnormalities in Patients With Acute Pancreatitis. — Rubio-Tapia A, García-Leiva J, Asensio-Lafuente E, Robles-Díaz G, Vargas-Vorácková F. Journal of Clinical Gastroenterology. 2005.

14. Acute Pancreatitis Presented With Diffuse ST-segment Elevation: A Case Report and Literature Review. — Hsieh YL, Wu SH, Liu CY, et al. Medicine. 2024.

15. Diastolic Dysfunction, Prolonged QTc Interval and Pericardial Effusion as Predictors of Mortality in Acute Pancreatitis. — Nadkarni N, Bhasin DK, Rana SS, et al. Journal of Gastroenterology and Hepatology. 2012.

16. A Case of Acute Necrotizing Pancreatitis Complicated With Non ST Elevation Myocardial Infarction. — Ralapanawa U, Jayalath T, Senadhira D. BMC Research Notes. 2018.

17. Contemporary Management of Acute Pancreatitis: What You Need to Know. — Palumbo R, Schuster KM. The Journal of Trauma and Acute Care Surgery. 2024.

18. Interventional Management of Acute Pancreatitis and Its Complications. — Masood M, Vedamurthy A, Krishnamoorthi R, et al. Journal of Clinical Medicine. 2025.

19. IAP/­APA Evidence-Based Guidelines for the Management of Acute Pancreatitis. — Pancreatology : Official Journal of the International Association of Pancreatology .... 2013.

20. Discharge Protocol in Acute Pancreatitis: An International Survey and Cohort Analysis. — Nagy R, Ocskay K, Sipos Z, et al. Scientific Reports. 2023.

21. Evaluation of a Predictive Model and Clinical Outcomes in Mild Acute Pancreatitis: Towards Evidence-Based Early Discharge. — Kant N, Spanier BWM, Witjes B, Doggen CJM. Digestive Diseases and Sciences. 2025.