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Difficulty: MediumGastroenterology and Hepatology

A 45-year-old man is evaluated in the intensive care unit 48 hours after being admitted for severe acute gallstone pancreatitis. Since admission, he has been receiving aggressive intravenous hydration with lactated Ringer solution and parenteral hydromorphone. He has been kept nothing by mouth. His temperature is 38.6°C (101.5°F), pulse is 118/min, blood pressure is 105/65 mmHg, and respirations are 26/min. Pulse oximetry shows 92% on room air. Physical examination reveals decreased breath sounds at both lung bases. The abdomen is distended, tympanic, and diffusely tender, most prominently in the epigastrium. Bowel sounds are absent. Laboratory studies show:

Leukocyte count: 18,500/mm³
Hemoglobin: 16.2 g/dL
Blood urea nitrogen: 32 mg/dL (was 18 mg/dL on admission)
Creatinine: 1.4 mg/dL
Calcium: 8.1 mg/dL

Arterial blood gas analysis on room air shows:
pH: 7.31
pCO₂: 29 mmHg
pO₂: 65 mmHg
HCO₃⁻: 14 mEq/L

A CT scan of the abdomen with intravenous contrast on admission showed 30% necrosis of the pancreatic body with no free air. A chest radiograph today demonstrates small bilateral pleural effusions. Which of the following is the most appropriate next step in the management of this patient?

  1. Initiate enteral nutrition via a nasojejunal tubeAnswer
  2. B
    Administer intravenous imipenem-cilastatin
  3. C
    Proceed to exploratory laparotomy for bowel decompression
  4. D
    Administer intravenous furosemide
  5. E
    Perform endotracheal intubation for uncompensated respiratory failure

Answer

Initiate enteral nutrition via a nasojejunal tube
This patient has severe acute pancreatitis complicated by pancreatic necrosis, Systemic Inflammatory Response Syndrome (SIRS), and a paralytic ileus. The standard of care for severe acute pancreatitis includes aggressive intravenous fluid resuscitation, pain control, and early enteral nutrition (within 24 to 72 hours of admission). Enteral feeding via a nasogastric or nasojejunal tube is vastly superior to total parenteral nutrition (TPN) and prolonged fasting (NPO). Enteral nutrients stimulate intestinal motility, maintain the integrity of the gut mucosal barrier, and prevent the translocation of enteric bacteria into the systemic circulation and the sterile retroperitoneal necrotic tissue. This significantly lowers the risk of infected pancreatic necrosis, multiorgan failure, and overall mortality.

Step-by-Step Solution

1
Analyze the patient's clinical deterioration at 48 hours.
The patient exhibits fever, tachycardia, tachypnea, and leukocytosis, which meet the criteria for Systemic Inflammatory Response Syndrome (SIRS).
SIRS is a hallmark of the early phase (first 1-2 weeks) of severe acute pancreatitis due to massive cytokine release, and does not inherently indicate an active infection.
2
Evaluate the fluid status and pulmonary findings.
Rising blood urea nitrogen (BUN) and hemoglobin indicate third-spacing and severe intravascular volume depletion. Pleural effusions represent inflammatory capillary leak.
Recognizing that the patient is volume-depleted despite effusions prevents the erroneous administration of diuretics, which would exacerbate pancreatic hypoperfusion.
3
Determine the optimal nutritional and pharmacological management.
Prophylactic antibiotics are contraindicated. The best intervention is to start early enteral feeding.
Enteral feeding helps preserve the gut mucosal barrier, which prevents the translocation of enteric bacteria into the sterile necrotic pancreatic tissue, thereby reducing mortality and the risk of infected necrosis.

Key Concept

In severe acute pancreatitis, early systemic signs (fever, leukocytosis) reflect SIRS rather than infection. Management focuses on aggressive fluid resuscitation and early enteral nutrition to prevent bacterial translocation.
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Topics

Gastroenterology and Hepatology

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