Severe asphyxia group had a shorter acceleration time and more minished ratio(AT/ET) of acceleration time(AT) to ejection time(ET) than either of normal and mild asphyxia group,so did mild asphyxia group than those of normal group.

• 肺动脉射血加速时间(AT)及与射血时间(ET)的比值(AT/ET)轻度窒息组较正常组；重度窒息较轻度窒息及正常组缩短或降低(P<0.；01或<0