system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Two days after undergoing porcine aortic valve replacement surgery for aortic valve stenosis, a 62-year-old patient develops yellow discoloration of the sclera. His vital signs are within normal limits. Physical examination shows scleral icterus. Abdominal examination shows no abnormalities. Laboratory studies show:
Hematocrit 49%
Reticulocyte count 1.2%
Serum
AST 15 U/L
ALT 18 U/L
Bilirubin, total 2.8 mg/dL
Direct 0.3 mg/dL
Lactate dehydrogenase 62 U/L
Which of the following is the most likely underlying mechanism of this patient's laboratory findings?"
assistant
Impaired bilirubin conjugation