A 47-year-old woman is evaluated in the emergency department after vomiting bright-red blood. She has alcoholic cirrhosis with ascites, which has been well controlled with diuretics. She has had jaundice and intermittent confusion for the past month. She has not consumed alcohol in the past 11 months. Her medications are spironolactone and furosemide, and octreotide was begun in the emergency department.

On physical examination, temperature is 36.8 °C (98.2 °F), blood pressure is 72/54 mm Hg, pulse rate is 112/min, and respiration rate is 20/min; BMI is 26. She is confused. Scleral icterus, jaundice, and spider angiomata over the chest are noted. The left lobe of the liver is firm and is palpated 3 cm below the costal margin. There is no abdominal pain or flank dullness.

Laboratory studies reveal a hemoglobin level of 8.7 g/dL (87 g/L).

Ultrasound shows a coarsened liver echotexture, left lobe hypertrophy, and splenomegaly but no ascites.

Intravenous fluid resuscitation is initiated.

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