The effects of α - adrenoceptor agonists and antagonists on the LVP , CO and HR of perfused heart were investigated in the rat heart-lung preparation , α _1-adrenoceptor agonist , methoxamine increased LVP and CO of perfused rat heart but showed no , effect on HR .

本文采用大鼠在位心脏灌流装置研究了α肾上腺素受体激动剂和阻断剂对大鼠灌流心脏的作用。α_1受体激动剂甲氧明可提高灌流心脏的LVP和CO，但对HR无明显作用。

NE , M , and control group were given norepinephrine ( 1mg / kg ), methoxamine or saline , respectively .

试验组、M组和对照组分别静滴去甲肾上腺素（NE）1毫克/公斤、美索克新明或生理盐水。