The thickness of wall increased and the cavity became narrow,and the thickness index(TI) and area index(AI) increased in middle and small pulmonary arteries of BLM and liposome groups.

• 肺动脉病理:BLM组及脂质体组中小肺动脉管壁增厚、管腔变小,肺动脉管壁的T I及A I明显增加;