摘要
目的探讨老年大鼠心肌磷脂和钙通道的变化及其与心律失常发生的关系。方法比较老年(24~26月龄)和青年(3~4月龄)大鼠极小量肾上腺素诱发心律失常的发生率、持续时间、病死率以及心室晚电位、心肌膜磷脂组分、钙通道二氢吡啶(DHP)受体活性、超氧化物歧化酶(SOD)活性的变化。结果老年大鼠心律失常诱发率高达100%,病死率23.5%,同时还存在膜卵磷脂降解;DHP受体平均解离常数(kd值)增大44%,最大结合率(Bmax)增高32%;SOD活性降低近50%。结论老年大鼠易发心律失常,其机理可能与心肌膜稳定性降低及分子受体活性衰退有关。
Objective To investigate the changes of myocardium phospholipids and calcium channel in aged rats,and their relationship with cardiac arrhythmias.Methods One hundred and thirtyfour SD rats were divided into four groups:younger control(3-4 months) and arrhythmia groups,aged control(24-26 months) and arrhythmia groups.Arrhythmias induced by epinephrine myocardium phospholipids,calcium channel and SOD activity were observed.Results The resuits showed that 100% aged rats had arrhythmias and 23.5% died with total phospholipids, phosphatidyl choline(PC) decreased significantly, kd and Bmax of dihydropyridine(DHP) calcium channel increased.Concluslons These facts suggest that arrhythmias found more frequently in aged rats,may be due to the ageing changes of myocardium phospholipids and calcium channel.
出处
《中华老年医学杂志》
CAS
CSCD
北大核心
1996年第5期302-305,共4页
Chinese Journal of Geriatrics
基金
国家自然科学基金