一、定义成人呼吸窘迫综合征(ARDS)是近十几年来才被公认为一种以急性呼吸衰竭为主要表现的综合征。其临床表现为呼吸窘迫、肺顺应性降低、动脉血氧张力(PaO_3)减少,胸片显示弥漫性肺浸润。据估计每年发生ARDS的病人约有15万,其中75%以上 First, the definition of adult respiratory distress syndrome (ARDS) is more than a decade has been recognized as a major manifestation of acute respiratory syndrome. The clinical manifestations of respiratory distress, decreased lung compliance, decreased arterial oxygen tension (PaO_3), chest X-ray showed diffuse pulmonary infiltration. It is estimated that about 150,000 ARDS patients occur each year, of which more than 75%