In group 1 (6 dogs ), after opening the chest,the left coronary artery was surrounded by a fitting flow prob of EBF and ploygraph system was connected with dogs.

• 给药前各指标为对照值。 第1组6只，静注吗啡2mg·kg－1和纳络酮0.；1mg·kg－1加吗啡2mg·kg－1。