目的：研究体外循环早期单次肺动脉灌注含左旋精氨酸的低钾右旋糖酐液对肺的保护作用。
Objective: To research the protection of pulmonary artery single perfusion with low potassium dextran (LPD) contains L-Arginine at earlier period of cardiopulmonary bypass (CPB).
精氨酸酶催化精氨酸转化成鸟氨酸和尿素，且是尿素循环的最后一步。
Arginase catalyzes the conversion of arginine to ornithine and urea, completing the last step in the urea cycle.
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