Acute pancreatitis is one of the most common gastrointestinal diseases managed by hospitalists. In the U.S., it accounts for nearly 300,000 admissions each year, more than one million inpatient days, and an estimated $2.5 billion in healthcare costs. Although most patients recover without incident, roughly one in five develop complications such as necrosis or organ failure that prolong hospitalization and increase mortality.
In 2024, the American College of Gastroenterology released updated Guidelines for the Management of Acute Pancreatitis,1 revisiting several long-standing practices. The revised guidance emphasizes more judicious use of imaging, balanced fluid resuscitation, early nutrition, antibiotic stewardship, and standardized surgical timing. For hospitalists, these recommendations have direct implications for how these patients are managed day to day.
Diagnosis
Diagnosis requires at least two of three criteria: (1) epigastric or left upper quadrant pain, typically constant with radiation to the back, chest, or flank; (2) serum lipase or amylase greater than three times the upper limit of normal; and (3) characteristic findings on abdominal imaging.
Lipase is the preferred biomarker, as it remains elevated longer and is more specific than amylase.
Routine CT imaging on admission is not recommended, as most patients have mild, uncomplicated courses that can be diagnosed on clinical and laboratory grounds alone, and early scanning rarely changes management. The guidelines reserve imaging for cases where the diagnosis is unclear or for patients who fail to improve after 48 to 72 hours of initial treatment. This shift reduces unnecessary radiation exposure, contrast use, and cost.
Bottom line: When clinical presentation and enzyme levels are consistent with acute pancreatitis, start treatment and hold off on imaging unless the patient isn’t improving.
Etiology and Work-Up
Gallstones and alcohol are the leading causes of acute pancreatitis, accounting for 40% to 70% of cases and 25% to 35% of cases, respectively. The guidelines recommend abdominal ultrasound for all patients admitted with acute pancreatitis to evaluate for a biliary cause, with a repeat study if the initial examination is inconclusive. In the absence of biliary or alcohol etiology, check serum triglycerides, as levels above 1,000 mg/dL point to hypertriglyceridemia as the cause. In patients over 40 with no clear etiology, pancreatic malignancy should be on the differential, as ductal obstruction from a mass can precipitate pancreatitis.
For patients with a second episode of idiopathic pancreatitis, cholecystectomy is recommended even without confirmed gallstones, given evidence of reduced recurrence.
Bottom line: Gallstones and alcohol are the most common causes of acute pancreatitis. Obtain an abdominal ultrasound in all patients to look for a biliary cause and repeat if the initial study is inconclusive. When biliary and alcohol etiologies have been excluded, check triglycerides and consider imaging for a pancreatic mass in patients over 40. Once a patient has experienced recurrence of idiopathic pancreatitis, refer for cholecystectomy.
Risk Stratification
Roughly one-third of patients with acute pancreatitis will progress to moderately severe or severe disease. Moderately severe disease involves transient organ failure resolving within 48 hours and/or local complications such as peripancreatic fluid collections, pseudocysts, or walled-off necrosis. Severe disease is defined as persistent organ failure that fails to resolve within 48 hours and/or death; it is responsible for nearly all the morbidity and mortality associated with the condition.
No scoring tool or imaging study reliably identifies who will deteriorate, but several early findings should raise concern:
- Systemic inflammatory response syndrome (SIRS) criteria on admission
- Blood urea nitrogen (BUN) greater than 20 mg/dL, rising BUN, and/or hematocrit greater than 44
- Altered mental status
- Age greater than 55
- Obesity (body mass index greater than 30)
- Signs of hypovolemia
- Radiographic findings of pleural effusion or pulmonary infiltrates
Patients with any of these features should be admitted to a monitored or intensive care unit.
Bottom line: Factors that suggest a higher risk of progression to severe disease include SIRS criteria, elevated or rising BUN and/or hematocrit, altered mental status, obesity, hypovolemia, or findings of pleural effusion or infiltrates.
Fluid Resuscitation
Intravenous hydration remains the cornerstone of management. The guidelines recommend moderately aggressive intravenous hydration using lactated Ringer’s (LR) rather than normal saline. LR reduces the risk of metabolic acidosis, supports better electrolyte balance, and has been associated with a lower risk of SIRS compared with normal saline. Large volume infusions of normal saline are also associated with abdominal discomfort and may exacerbate symptoms.
In euvolemic patients, start with up to 1.5 mL/kg/hr of LR. For patients showing signs of hypovolemia, give a 10 mL/kg bolus first. Reassess at six hours and again at 24 to 48 hours using BUN trend, hematocrit, urine output, and vital signs. Adjust for patients with cardiac or renal disease to prevent fluid overload. Aggressive hydration beyond 48 hours can cause harm, particularly in older adults, and should be avoided once the patient is stabilized.
Bottom line: Use LR for all patients with acute pancreatitis. Start at 1.5 mL/kg/hr, or if hypovolemic, bolus 10 mL/kg. Reassess frequently and pull back on fluids by 48 hours.
Nutrition
Keeping patients nil per os until symptoms improve and then advancing slowly from clear liquids is no longer the standard. The guidelines recommend starting oral feeds within 24 to 48 hours as tolerated, beginning with low-fat solid foods rather than working up from liquids. Early feeding maintains gut integrity, reduces bacterial translocation, and shortens the length of stay.
For a patient who cannot safely eat, enteral nutrition via nasogastric tube is preferred over parenteral nutrition or the previously recommended nasojejunal (NJ) route.
In moderately severe and severe disease, enteral feeding via nasogastric (NG) tube should still be pursued when feasible. Parenteral nutrition should be avoided unless the enteral route is not possible, not tolerated, or not able to meet caloric needs.
Bottom line: Feed patients early. Start low-fat solids within 24 to 48 hours when tolerating oral intake. NG tube feed those who cannot eat safely; avoid parenteral nutrition and NJ tubes.
ERCP and Biliary Pancreatitis
In gallstone pancreatitis, a persistent common bile duct stone can lead to obstruction and, in turn, to necrosis or cholangitis. Most gallstones will pass on their own, and most patients with gallstone pancreatitis will not need endoscopic retrograde cholangiopancreatography (ERCP).
For patients with cholangitis, ERCP within 24 hours is supported by evidence of reduced morbidity and mortality. In all other cases, the guidelines favor medical management over ERCP in the first 72 hours. In the absence of these findings, patients should be managed conservatively, with magnetic resonance cholangiopancreatography or endoscopic ultrasound used to confirm choledocholithiasis before any procedural intervention is considered.
Rectal indomethacin (100 mg) should be given to all patients at high risk for post-ERCP pancreatitis. For patients at the highest risk, a prophylactic pancreatic duct stent in addition to indomethacin further reduces the risk.
For patients with mild gallstone pancreatitis who stabilize with conservative care, same-admission cholecystectomy is recommended to prevent recurrence.
Bottom line: Most patients will not need ERCP. For those with choledocholithiasis or jaundice, communicate early with gastroenterology and consider a magnetic resonance cholangiopancreatography prior to ERCP. For mild gallstone pancreatitis, discuss with surgery for cholecystectomy before discharge.
Antibiotics
Prophylactic antibiotics are not recommended in acute pancreatitis, even in severe disease or sterile necrosis. Antibiotics should only be used when an infection is confirmed, such as in infected necrosis, cholangitis, or bacteremia.
In infected necrosis, the approach depends on stability. Unstable patients should be considered for urgent debridement. For stable patients, a two- to four-week course of antibiotics prior to intervention allows the inflammatory process to organize, making drainage and debridement more feasible. Antibiotic selection and timing should be determined in concert with infectious disease and surgery.
CT-guided fine-needle aspiration is no longer recommended to confirm infected necrosis before starting antibiotics. Clinical suspicion, blood cultures, or the presence of gas in the necrosis on CT are sufficient to guide the decision to start antibiotics.
Bottom line: Avoid prophylactic antibiotics in acute pancreatitis, regardless of severity. For infected necrosis, start antibiotics early and coordinate with infectious disease and surgical teams about selection and duration of antibiotics and timing of drainage.
Evaluating the Evidence
The American College of Gastroenterology applied the GRADE framework to classify each recommendation by strength (strong or conditional) and evidence quality (high to very low). Most recommendations relevant to hospitalists are conditional, supported by low or very low-quality evidence, reflecting the scarcity of randomized trial data in this space, with recommendations driven largely by physiologic rationale and expert opinion.
Examples:
- LR preferred over saline (conditional, low quality)
- Early oral feeding (conditional, low quality)
- Avoidance of prophylactic antibiotics (conditional, very low quality)
Within our institutional MedStar Hospital Medicine Evidence Watch Committee, each recommendation was evaluated across the strength of evidence, relevance to hospital medicine, and feasibility for implementation by our hospitalists system-wide.
We concluded that LR use with moderately aggressive fluid resuscitation, early feeding, and antibiotic restraint is a low-risk intervention with a plausible benefit profile and few downsides. Areas like infected necrosis management and procedural timing are where multidisciplinary input from gastroenterology and surgery remains essential.
Dr. Choudry
Dr. Barnett
Dr. Suojanen
Dr. Choudry is associate division chief of hospital medicine and an academic hospitalist at MedStar Washington Hospital Center and an assistant professor of medicine at Georgetown University School of Medicine, both in Washington, D.C. Dr. Barnett is a hospital medicine physician assistant and associate medical director of the inpatient readmission reduction program at MedStar Franklin Square Medical Center in Baltimore. Dr. Suojanen is a hospitalist at MedStar Georgetown University Hospital in Washington, D.C.
Reference
- Tenner S, et al. American College of Gastroenterology guidelines: management of acute pancreatitis. Am J Gastroenterol. 2024;119(3):419-437. doi:10.14309/ajg.0000000000002645.
very interesting article and concise about the recommendations, thanks!