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).
方法CPB采用深低温低流量（DHLF），心肌保护为4：1高钾含血停搏液灌注。
METHODS Deep hypothermia low flow rate (DHLF) were used during CPB, 4:1 cold blood hyperkalemic cardioplegia were used in all patients.
方法CPB采用深低温低流量（DHLF），心肌保护为4：1高钾含血停搏液灌注。
METHODS Deep hypothermia low flow rate (DHLF) were used during CPB, 4:1 cold blood hyperkalemic cardioplegia were used in all patients.
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