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Distribution of plasma xanthine oxidoreductase (XOR) activity in each group. (A) In the control group, the plasma XOR activity was <25 pmol/h/mL in 71 (30.7%) patients and >300 pmol/h/mL in seven (3.0%). (B) In the acute heart failure (AHF) group, the plasma XOR activity was <25 pmol/h/mL in 29 (24.6%) patients and >300 pmol/h/mL in 34 (28.8%).
