【摘要】 10^-8mol/L、5.5×10^-8mol/L、10^-7mol/L的硫酸吗啡使体外培养的乳鼠心肌细胞搏动频率分别增加9%、32%和81%。具有量效关系。纳络酮(10^-5mol/L)能完全取消吗啡的此种作用。而普萘洛尔(10^-5mol/L)却不影响吗啡的作用。这一结果提示吗啡可直接加快心肌细胞的搏动频率,可能是通过激动吗啡受体而作用的更多还原

【Abstract】 At the concentrations of 10-8mol/L, 5.5×l0-8mol/L, 10-7mol/L morphine produced a dose-dependent increase of beating rate in cultured rat heart cells with 9%,32%and 81% respectively. The increase was antagonized by opiate antagonist naloxone ( 10-5mol/L ) , but not affected by propranolol ( 10-5mol/L ) which could cancel the positive chronotropy of isoprenaline ( 10-9mol/L ) on the beating cells. The results support the concept that morphine may be a direct effect on myocadium, perhaps through opiate receptors.更多还原