A 74-year-old woman is brought to the emergency department from a skilled nursing facility… — USMLE Step 3

A 74-year-old woman is brought to the emergency department from a skilled nursing facility due to fever and altered mental status over the past 24 hours. Her medical history includes hypertension, type 2 diabetes mellitus, and osteoarthritis.

Vitals:
Temperature: $39.6^{\circ}\text{C}$ ( $103.3^{\circ}\text{F}$ )
Blood pressure: $82/52 \text{ mmHg}$
Heart rate: $128/\text{min}$
Respiratory rate: $24/\text{min}$
Oxygen saturation: 94% on room air

Physical examination reveals profound lethargy, scleral icterus, and severe right upper quadrant abdominal tenderness with guarding.

Laboratory studies:
Leukocyte count: $24,500/\text{mm}^3$ (15% bands)
Hemoglobin: $10.2 \text{ g/dL}$
Platelet count: $88,000/\text{mm}^3$
Total bilirubin: $7.8 \text{ mg/dL}$
Direct bilirubin: $6.1 \text{ mg/dL}$
Alkaline phosphatase: $640 \text{ U/L}$
Aspartate aminotransferase: $185 \text{ U/L}$
Alanine aminotransferase: $210 \text{ U/L}$
Prothrombin time: $22 \text{ seconds}$
INR: $2.3$

Right upper quadrant ultrasound demonstrates a dilated common bile duct measuring 1.4 cm with an obstructing echogenic focus. The gallbladder is present but lacks wall thickening or pericholecystic fluid.

Aggressive intravenous fluid resuscitation and broad-spectrum antibiotics are immediately initiated. Following the infusion of 2 liters of crystalloid, her blood pressure is $98/60 \text{ mmHg}$ and her heart rate is $105/\text{min}$ .

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

Endoscopic retrograde cholangiopancreatographyAnswer
B
Magnetic resonance cholangiopancreatography
C
Computed tomography of the abdomen and pelvis
D
Administration of 4-factor prothrombin complex concentrate
E
Admission to the general medical ward for continuous intravenous antibiotics

Answer

Endoscopic retrograde cholangiopancreatography

This patient presents with Reynolds pentad (fever, right upper quadrant pain, jaundice, hypotension, and altered mental status), which is pathognomonic for acute severe (suppurative) cholangitis. Ultrasound confirms the diagnosis by showing common bile duct dilation and an obstructing stone. The initial management consists of hemodynamic stabilization with intravenous fluids and broad-spectrum antibiotics. However, medical therapy alone is insufficient for severe cholangitis; emergent biliary decompression is required to remove the infected bile and obstructing stone. Endoscopic retrograde cholangiopancreatography (ERCP) with sphincterotomy is the standard of care and the most appropriate procedural intervention to rapidly decrease biliary pressure and control the source of sepsis.

Step-by-Step Solution

Identify the clinical syndrome based on the presentation and vital signs.

The patient has fever, jaundice, right upper quadrant pain (Charcot's triad), hypotension, and altered mental status, completing Reynolds pentad.

Recognizing Reynolds pentad is critical for diagnosing acute severe (suppurative) cholangitis.

Evaluate the diagnostic data.

Labs show leukocytosis, conjugated hyperbilirubinemia, and elevated alkaline phosphatase. Ultrasound confirms a dilated common bile duct with a gallstone.

This confirms the etiology is an obstructing choledocholithiasis causing biliary stasis and ascending infection.

Determine the definitive procedural intervention.

The patient requires emergent biliary decompression via endoscopic retrograde cholangiopancreatography (ERCP).

While IV fluids and antibiotics provide initial stabilization, the source of infection (obstructed, purulent biliary tree) must be physically drained to prevent mortality.

Key Concept

Emergent biliary decompression via ERCP is the definitive procedural management for acute severe cholangitis (Reynolds pentad) once initial hemodynamic stabilization is underway.

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