A 62-year-old male with a history of alcohol-associated cirrhosis and chronic obstructive … — USMLE Step 2 CK

A 62-year-old male with a history of alcohol-associated cirrhosis and chronic obstructive pulmonary disease (COPD) is brought to the emergency department by his wife due to severe weakness, confusion, and worsening shortness of breath over the past 24 hours. She reports that he passed a large volume of black, tarry stool earlier this morning.

On arrival, his temperature is $37.2^\circ\text{C}$ ( $99.0^\circ\text{F}$ ), pulse is $122/\text{min}$ , blood pressure is $88/54\text{ mm Hg}$ , and respirations are $24/\text{min}$ . Oxygen saturation is $94\%$ on room air. Physical examination reveals a lethargic but arousable patient with pale conjunctivae. Chest examination shows decreased breath sounds bilaterally but no crackles or wheezes. The abdomen is distended with shifting dullness. A coarse, flapping tremor is noted upon wrist extension.

Laboratory and diagnostic studies show the following:

Test	Result
Hemoglobin	$6.8\text{ g/dL}$
Platelet count	$88,000/\text{mm}^3$
Blood urea nitrogen	$64\text{ mg/dL}$
Serum creatinine	$1.5\text{ mg/dL}$
Thyroid-stimulating hormone (TSH)	$0.2\text{ }\mu\text{U/mL}$ (Normal: 0.5-5.0)
Free T4	$0.7\text{ ng/dL}$ (Normal: 0.9-1.7)

Arterial blood gas (on room air):

Parameter	Result
pH	$7.32$
$\text{pCO}_2$	$30\text{ mm Hg}$
$\text{HCO}_3^-$	$15\text{ mEq/L}$

A urine culture collected two days ago at an urgent care clinic for mild dysuria has returned positive for >100,000 CFU/mL of *Escherichia coli*. The isolate is sensitive to ceftriaxone, nitrofurantoin, and trimethoprim-sulfamethoxazole.

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

Intravenous fluid resuscitation, administration of octreotide and ceftriaxone, and preparation for endoscopyAnswer
B
Endotracheal intubation and administration of intravenous sodium bicarbonate
C
Administration of intravenous meropenem and vancomycin
D
Initiation of noninvasive positive pressure ventilation and intravenous furosemide
E
Administration of intravenous levothyroxine for acute decompensated hypothyroidism

Answer

The most appropriate initial management is intravenous fluid resuscitation, administration of octreotide and ceftriaxone, and preparation for endoscopy.

The patient is presenting with acute upper gastrointestinal bleeding (melena, severe anemia) leading to hemorrhagic shock and precipitation of hepatic encephalopathy (asterixis, confusion). In a patient with cirrhosis, the most likely source is ruptured esophageal varices. The standard of care includes hemodynamic resuscitation (IV fluids, blood products), pharmacotherapy to reduce splanchnic blood flow (octreotide or somatostatin), and prophylactic antibiotics (typically a third-generation cephalosporin like ceftriaxone) to prevent spontaneous bacterial peritonitis and bacteremia. This is followed by urgent upper endoscopy for definitive diagnosis and treatment (e.g., variceal ligation).

Step-by-Step Solution

Identify the primary life-threatening pathology.

The patient has melena, hypotension, tachycardia, and severe anemia, pointing to an acute upper gastrointestinal hemorrhage, which has triggered hepatic encephalopathy.

Recognizing hemorrhagic shock in a cirrhotic patient directs immediate life-saving interventions.

Evaluate the patient's acid-base status to rule out respiratory failure.

Applying Winter's formula (1.5 * HCO3 + 8) yields an expected pCO2 of 30.5. The actual pCO2 is 30 mm Hg, confirming full respiratory compensation without respiratory failure.

Differentiating between compensatory tachypnea and primary respiratory failure prevents unnecessary and potentially harmful intubation.

Select the appropriate pharmacologic adjuncts for a cirrhotic patient with a GI bleed.

Octreotide is selected to reduce splanchnic pressure, and ceftriaxone is selected as a targeted prophylactic antibiotic that also covers his known sensitive E. coli.

Guidelines mandate vasoactive drugs and targeted antibiotic prophylaxis to reduce mortality and rebleeding in cirrhotic GI hemorrhages.

Key Concept

Acute management of variceal hemorrhage in cirrhosis

Estimated Time:1m 30s

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