摘要
本实验结果表明,家兔静注PGE_2(Iμg/min/kg)后,动脉收缩压、静脉舒张压、平动脉压均显著下降,左室+dp/dt max,-dp/dt max、心肌耗氧量亦显著下降;心率、左室射血时间、左室收缩成分缩短速率,左室等容舒张期压力下降的时间常数均无明显改变。结果提示:家兔静注PGE_2,可降低动脉血压,减少心脏负荷,降低心肌耗氧量,但对心脏舒缩功能无明显影响。急性心肌梗塞的家兔,静注同剂量的PGE_2,可使+dP/dt max、-dp/dt max显著高于对照组;ST段抬高值亦显著低于对照组,LVSP高于对照组但无统计学意义。本结果亦进一步表明PGE_2可改善心肌血供,降低室壁张力,减少心肌耗氧量,以维持心脏功能。提示PGE_2对心肌梗塞具有保护作用。
The effects of prostaglandin E_2 on hemodynamics and cardial function in normal rabbits and on cardioprotection in experimental acute myocardial infarction rabbits were investigated. To determine the action of prostaglandin E_2 in normal rabbits (n = 10), we measured arterial systolic pressure (ASP), arterial diastolic pressure (ADP), mean arterial pressure (MAP), heart rate (HR), left ventricular ejection time (LVET), +dp/dt max, -dp/dt max, Vc_E-50, T time after injected prostaglandin E_2 (1μg/min/kg). The results showed that ASP, ADP, MAP were decreased. HR, Vc_E-50, LVET were unchanged. To determine the effects of prostaglandin E_2 on the cardioprotection in acute myocardial infarction in rabbits (n=8), left ventricular systolic pressure (LVEP), +dp/dt max,-dp/dt max, ST of ECG, infarct size were also measured by us. The results showed that +dp/dt max, -dp/dt max were higher than control (n=9), ST lower than control, LVSP and infarct size were unchanged. Thus, prostaglandin E_2 could relax vascular smooth muscle, reduce laod of heart, decrease myocardial oxygen demands, maintain cardiac function during acute myocardial infarction.
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
1990年第1期40-43,共4页
Chinese Journal of Pathophysiology
