After pituitrin was given intravenously(0.3U/kg), APH was lowered by 28%, and APD50 and APD_(90) were shortened by 17% and 15% respectively.

• 静脉注射垂体后叶素(0.；3 U/kg)后；APH降低28%25；APD_(50)与APD_(50)分别缩短17%25与15%25。