Emergency medical services bring a 72-year-old woman to the acute care unit due to rapid c… — USMLE Step 2 CK

Emergency medical services bring a 72-year-old woman to the acute care unit due to rapid clinical deterioration over the past $24$ hours. She initially complained of severe right-sided abdominal discomfort before becoming acutely confused. Her temperature is $39.2^\circ\text{C}$ ( $102.6^\circ\text{F}$ ), blood pressure is $80/50\text{ mm Hg}$ , pulse is $120/\text{min}$ , and respiratory rate is $22/\text{min}$ . Physical examination reveals distinct yellowing of the sclerae and profound tenderness upon palpation of the right upper quadrant, with no peritoneal signs. She is lethargic and disoriented to time and place. Laboratory studies show:

Test	Result	Reference Range
Leukocyte count	$18,500/\text{mm}^3$	$4,500-11,000/\text{mm}^3$
Total bilirubin	$6.2\text{ mg/dL}$	$0.1-1.0\text{ mg/dL}$
Direct bilirubin	$4.8\text{ mg/dL}$	$0.0-0.3\text{ mg/dL}$
Alkaline phosphatase	$450\text{ U/L}$	$40-120\text{ U/L}$
Aspartate aminotransferase (AST)	$110\text{ U/L}$	$8-20\text{ U/L}$
Alanine aminotransferase (ALT)	$125\text{ U/L}$	$10-40\text{ U/L}$

Right upper quadrant ultrasound demonstrates a dilated common bile duct measuring $12\text{ mm}$ (normal $< 8\text{ mm}$ ) with an echogenic focus casting a distal acoustic shadow. The gallbladder contains multiple gallstones but no pericholecystic fluid. Intravenous fluids and broad-spectrum antibiotics are initiated.

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

A
Continuation of broad-spectrum antibiotics without further intervention
B
Emergent exploratory laparotomy and bowel resection
C
Administration of intravenous sodium bicarbonate
Endoscopic retrograde cholangiopancreatographyAnswer
E
Initiation of non-invasive positive pressure ventilation and intravenous furosemide

Answer

Endoscopic retrograde cholangiopancreatography

The correct intervention is endoscopic retrograde cholangiopancreatography. This patient is presenting with Reynolds pentad, which consists of Charcot triad (fever, right upper quadrant pain, and jaundice) plus hypotension and altered mental status. This presentation is highly specific for severe (suppurative) acute ascending cholangitis. Ultrasound findings of a dilated common bile duct with an obstructing stone confirm the diagnosis. The immediate management of acute cholangitis involves hemodynamic resuscitation with intravenous fluids and broad-spectrum antibiotics. However, in patients with severe disease (indicated by shock and confusion), emergent biliary decompression is the definitive and life-saving intervention. Endoscopic retrograde cholangiopancreatography is the procedure of choice as it provides immediate mechanical source control by removing the obstructing stone from the common bile duct.

Step-by-Step Solution

Identify the clinical syndrome based on the patient's presentation.

The patient exhibits fever, right upper quadrant pain, jaundice, hypotension, and altered mental status, which collectively form Reynolds pentad.

Recognizing this classic constellation of symptoms is essential for diagnosing severe acute cholangitis.

Correlate clinical findings with laboratory and imaging results.

Elevated direct bilirubin and alkaline phosphatase indicate a cholestatic pattern. Ultrasound confirms common bile duct dilation and an obstructing stone.

Imaging and labs confirm that choledocholithiasis is the underlying cause of the biliary obstruction and subsequent severe infection.

Determine the most appropriate definitive management for severe acute cholangitis.

Following initial hemodynamic resuscitation and antibiotics, emergent biliary decompression via endoscopic retrograde cholangiopancreatography is required.

Without rapid mechanical source control to relieve the infected, pressurized biliary tree, mortality from septic shock remains extremely high.

Key Concept

Patients presenting with Reynolds pentad (fever, right upper quadrant pain, jaundice, hypotension, and altered mental status) have severe acute cholangitis and require emergent biliary decompression, typically via endoscopic retrograde cholangiopancreatography.

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