A 48-year-old man comes to the emergency department due to severe, constant epigastric pai… — USMLE Step 2 CK

A $48$ -year-old man comes to the emergency department due to severe, constant epigastric pain that radiates to his back. The pain began $12$ hours ago and is associated with nausea and $2$ episodes of nonbilious emesis. His medical history is notable for alcohol use disorder, and he reports consuming $4$ to $5$ alcoholic beverages daily. His temperature is $37.8^\circ\text{C}$ ( $100.0^\circ\text{F}$ ), blood pressure is $135/85\text{ mm Hg}$ , pulse is $112/\text{min}$ , and respirations are $18/\text{min}$ . Physical examination reveals a moderately distended abdomen with marked epigastric tenderness, but no rebound or guarding. Bowel sounds are hypoactive.

Laboratory studies show:

Test	Result	Reference Range
Leukocyte count	$12,500/\text{mm}^3$	$4,500$ – $11,000/\text{mm}^3$
Serum lipase	$3,400\text{ U/L}$	$0$ – $160\text{ U/L}$
Alanine aminotransferase (ALT)	$35\text{ U/L}$	$10$ – $40\text{ U/L}$
Aspartate aminotransferase (AST)	$72\text{ U/L}$	$10$ – $40\text{ U/L}$
Alkaline phosphatase	$80\text{ U/L}$	$25$ – $100\text{ U/L}$
Total bilirubin	$1.0\text{ mg/dL}$	$0.1$ – $1.0\text{ mg/dL}$

An abdominal ultrasound demonstrates an enlarged, hypoechoic pancreas with peripancreatic fluid, and no evidence of gallstones or biliary dilation.

Which of the following is the most appropriate next step in management?

Aggressive intravenous fluid resuscitation and targeted analgesiaAnswer
B
Initiation of prophylactic intravenous meropenem
C
Endoscopic retrograde cholangiopancreatography
D
Immediate exploratory laparotomy
E
Intravenous ceftriaxone

Answer

The most appropriate next step is aggressive intravenous fluid resuscitation and targeted analgesia.

The correct answer emphasizes aggressive intravenous fluid resuscitation and targeted analgesia. Acute pancreatitis causes significant fluid third-spacing into the retroperitoneum and systemic circulation due to endothelial injury. Early and aggressive hydration (typically with isotonic crystalloids like lactated Ringer's solution) is the most critical intervention to maintain pancreatic microcirculation, prevent necrotizing pancreatitis, and avoid acute kidney injury. Analgesia is concurrently required for severe pain.

Step-by-Step Solution

Analyze the clinical presentation and laboratory findings.

The patient presents with severe epigastric pain radiating to the back, nausea, emesis, and a serum lipase level significantly greater than 3 times the upper limit of normal.

To definitively establish the diagnosis of acute pancreatitis based on standardized criteria.

Evaluate the etiology based on history and ultrasound.

A history of heavy alcohol use points to alcohol-induced pancreatitis. Normal liver enzymes (bilirubin, alkaline phosphatase) and an ultrasound without gallstones rule out biliary pancreatitis.

To determine if specific targeted interventions, such as biliary decompression, are indicated.

Determine the most appropriate initial management.

The standard of care dictates immediate supportive therapy with aggressive fluid resuscitation and pain control.

To counteract profound fluid third-spacing, maintain microvascular organ perfusion, and prevent severe complications such as acute kidney injury and pancreatic necrosis.

Key Concept

The cornerstone of early management in acute pancreatitis is aggressive intravenous fluid resuscitation and analgesia. Prophylactic antibiotics and early invasive procedures are contraindicated in sterile, uncomplicated cases.

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