A 48-year-old man is evaluated in the hospital on day 5 of an admission for severe acute p… — USMLE Step 2 CK

A $48$ -year-old man is evaluated in the hospital on day $5$ of an admission for severe acute pancreatitis. He originally presented with severe, radiating epigastric pain, nausea, and a serum lipase level of $3,200\text{ U/L}$ . The patient has a $10$ -year history of heavy alcohol consumption. He has been strictly nil per os (NPO) and is receiving intravenous crystalloid fluids and opioid analgesics. Today, his temperature is $38.4^\circ\text{C}$ ( $101.1^\circ\text{F}$ ), blood pressure is $118/74\text{ mmHg}$ , pulse is $108/\text{min}$ , and respirations are $18/\text{min}$ . Physical examination reveals persistent epigastric tenderness to deep palpation without rebound tenderness or guarding. Bowel sounds are hypoactive. Laboratory studies show:

Leukocyte count: $16,500/\text{mm}^3$
Total calcium: $7.8\text{ mg/dL}$
Albumin: $2.0\text{ g/dL}$
Liver function tests: Within normal limits

A repeat computed tomography (CT) scan of the abdomen with intravenous contrast demonstrates an area of non-enhancement involving approximately $40\%$ of the pancreatic body and tail, consistent with pancreatic necrosis. There is no visible gas within the peripancreatic fluid collection. Which of the following is the most appropriate next step in management?

Continue supportive care and initiate enteral nutritionAnswer
B
Initiate intravenous imipenem-cilastatin
C
Administer intravenous calcium gluconate
D
Perform CT-guided fine-needle aspiration of the pancreas
E
Schedule endoscopic retrograde cholangiopancreatography

Answer

Continue supportive care and initiate enteral nutrition

The correct management is to continue supportive care and initiate enteral nutrition. This patient is exhibiting signs of Systemic Inflammatory Response Syndrome (SIRS), which frequently occurs during the first week of severe acute pancreatitis. SIRS manifests with fever, tachycardia, and leukocytosis, mimicking infection. However, the CT scan confirms sterile pancreatic necrosis by the absence of gas within the fluid collection. Evidence-based guidelines strongly advise against the prophylactic use of broad-spectrum antibiotics (such as carbapenems) for sterile necrosis, as they do not decrease the incidence of infected necrosis or mortality. Instead, early enteral nutrition (via nasogastric or nasojejunal tube) should be initiated. Enteral feeding maintains the intestinal mucosal barrier, thereby preventing bacterial translocation from the gut and actively reducing the risk of subsequent necrosis infection.

Step-by-Step Solution

Interpret the clinical presentation and timing.

The patient is on day

5

of severe acute pancreatitis and has developed a fever and leukocytosis.

To distinguish between early Systemic Inflammatory Response Syndrome (SIRS), which is expected, and late infected necrosis.

Analyze the imaging and laboratory findings.

The CT scan confirms sterile necrosis (no gas present). The total calcium is

7.8\text{ mg/dL}

, but correcting for an albumin of

2.0\text{ g/dL}

yields a normal corrected calcium of

9.4\text{ mg/dL}

To rule out infected necrosis and true hypocalcemia, both of which would require specific interventions.

Select the appropriate management strategy based on findings.

Supportive care combined with the initiation of enteral nutrition is chosen.

Enteral feeding is preferred over parenteral nutrition to maintain the gut mucosal barrier, and prophylactic antibiotics are contraindicated for sterile necrosis.

Key Concept

Management of sterile pancreatic necrosis and expected SIRS in severe acute pancreatitis.

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Topics

More questions from this topic