机构地区:[1]南京中医药大学药学院国家科技部规范化中药药理实验室,江苏南京210023 [2]南京军区总医院干部病房呼吸科,江苏南京210002 [3]南京中医药大学第一附属医院(江苏省中医院)心脏内科,江苏南京210029 [4]泰州中国医药城中医药研究院,江苏泰州225300
出 处:《中国药理学与毒理学杂志》2017年第2期179-186,共8页Chinese Journal of Pharmacology and Toxicology
基 金:2014年度江苏省高校自然科学研究重大项目(14KJA360002);江苏省自然科学基金(BK20151355);江苏省自然科学基金(BK20131262);泰州中国医药城第四批次高层次创新人才"113人才计划"(2016024)~~
摘 要:目的研究强心苷类正性肌力代表药去乙酰毛花苷与非强心苷类正性肌力代表药米力农的心血管动力学作用特点,分析其长期使用死亡率差别的可能机制。方法 1大鼠在体压力-容积环分析:经左侧颈外静脉缓慢推注去乙酰毛花苷0.17 mg·kg^(-1)或米力农0.78 mg·kg^(-1),Miller导管记录大鼠压力-容积环变化及动脉压。2大鼠离体心脏左心室收缩压测定:实验按正常灌流液→0.01→0.1→1μmol·L^(-1)浓度梯度灌流去乙酰毛花苷,或正常灌流液→0.1→1→10μmol·L^(-1)灌流米力农。3大鼠心肌细胞钙释放测定:测定去乙酰毛花苷或米力农各10μmol·L^(-1)加药前后钙释放。结果 1在体实验表明:去乙酰毛花苷显著增加大鼠动脉压与心室收缩末期压、心输出量、搏出功、心室收缩末期压最大上升速率和心室收缩弹性;降低舒张弹性及心室收缩末期容积;延长动脉收缩压回复50%的时间;缩短主动脉瓣关闭时间(P<0.05)。米力农显著降低大鼠动脉压与室收缩末期压、降低心室收缩及舒张末期容积、搏出功;增加每搏输出量、射血分数、输出量、心率、心室收缩末期压与舒张弹性;缩短心室内压及动脉收缩压回复50%的时间(P<0.05)。2两者均能浓度依赖性地增加离体大鼠心脏收缩的发展力及收缩压最大上升速率,但去乙酰毛花苷减慢心率,而米力农增加心率(P<0.05)。3两者均能增加大鼠心肌细胞钙释放幅值,米力农还能缩短钙回吸收时间(P<0.05)。结论去乙酰毛花苷具有正性肌力作用,而对外周阻力无明显影响。米力农发挥正性肌力作用,但有明显的扩张血管作用,且明显增加心率;这些作用可能是米力农长期使用导致死亡率增加的原因。OBJECTIVE To explore the cardiodynamic characteristics of deslanoside and milrinone and analyze their mortalitiy of chronic use underlying these characteristics.METHODS 1 In vivo study was made to record the effects of deslanoside(0.17 mg·kg^-1) and milrinone(0.78 mg·kg^-1) injected from the left external jugular vein on pressure-volume relationships(P-V loop) and aortic pressure.(2) Ex vivo study was used to record the effects of deslanoside and milrinone on rat isolated contractilities.Deslanoside and milrinone were perfused to in this order: normal perfusion solution→ deslanoside0.01→ 0.1→ 1 μmol·L^-1or normal perfusion solution→ milrinone 0.1→ 1→ 10 μmol·L-(-1).(3) Ca^2+transient from cardiomyocyte sarcoplasmic reticulum(SR) was measured to analyze the inotropic effects of deslanoside 10 μmol·L^-1 and milrinone 10 μmol·L^-1.RESULTS(1) Deslanoside 0.17 mg·kg^-1 significantly enhanced the aortic blood pressure(both SBP and DBP) and end-systolic pressure(Pes), cardiac output(CO), stroke work(SW), peak rate of rise of left pressure(+dp:dtmax), and end-systolic elastance(Ees), reduced end-diastolic elastance(Eed) and end-systolic volume(Ves)(P〈0.05), prolonged systolic blood pressure durations at 50% full recovery level(SBPD50), and shortened aortic valve closing time(AVCT)(P〈0.05).Milrinone 0.78 mg·kg^-1significantly reduced SBP, DBP, Pes, end-systolic volume(Ves),end-diastolic volume(Ved)(P〈0.05), and increased stroke volume(SV), ejection fraction(EF), CO,heart rate(HR), Eesand Eed(P〈0.05), and shortened left ventricular pressure durations at 50% full recovery level(LVPD50) and SBPD50(P〈0.05).(2) Both deslanoside and milrinone significantly increased the isolated rat left ventricular developed pressure(LVDP) and+dp:dtmax in a concentration-dependent manner.However, deslanoside decreased HR and milrinone increased HR(P〈0.05).(3) Both de
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