甘草酸二铵对大鼠心肌缺血再灌注损伤左心室功能的影响

目的：观察甘草酸二铵（DG）对大鼠心肌缺血再灌注损伤左心室功能的影响。方法：采用在体大鼠心肌缺血再灌注损伤模型，经右颈总动脉行左心室插管，于给药前、注药后10min，缺血即刻、20min及再灌注即刻、30、60min时，分别测定各组左心室内压峰值（LVSP）、左心室舒张末压（LVEDP）、左心室等容收缩期最大压力变率（＋dp/dtmax)、左心室舒张期压力下降最大变率（-dp/dtmax)，以评价左心室功能。结果：与基础值比较，给予DG后LVSP、 dp/dtmax、-dp/dtmax都下降（P＜0．05，P＜0．01），LVEDP上升（P＜0．01）。随着再灌注时间的延长，缺血再灌注组的LVSP、＋dp/dtmax、-dp/dtmax呈进行性下降，LVEDP呈进行性上升。DG组的缺血20min，再灌注即刻，30、60min的LVSP、 dp/dtmax 、-dp/dtmax显著高于同时间点的缺血再灌注组（P＜0．01），LVEDP显著低于同时间点缺血再灌注组指标（P＜0．01）。结论：甘草酸二铵对大鼠心肌缺血再灌注损伤后有保护作用。

The Effect of DiammoniumGlycyrrhizinate on Left Ventricular Function of Myocardial Ischemia

Objective:To study the effect of diammonium glycyrrhizinate (DG) on left ventricular function impairment during myocardial ischemia－reperfusion in rats.　Methods:The left ventricular was cannulated through right common carotid artery on the myocardial ischemia－reperfusion injury model. The left ventricler function was assessed before and 10 minutes after the administration of DG, immediate and 20 minutes after initiation of ischemia, immediate and 30, 60 minutes after reperfusion, by measuring the left ventricular systolic pressure (LVSP), left ventricular end diastolic pressure (LVEDP), ＋dp*dtmax and －dp*dtmax. 　Results:Compared with the baseline, all measurements of LVSP, ＋dp*dtmax and －dp*dtmax decreased (P＜0.05,P＜0.01), while LVEDP increased (P＜0.01) after administration of DG. As the time of ischemia－reperfusion lasting, LVSP, dp*dtmax and －dp*dtmax generally decreased progressively, while LVEDP generally increased progressively. 20 minutes after the initiation of ischemia and immediate, 30 and 60 minutes following reperfusion, LVSP, ＋dp*dtmax and －dp*dtmax in the DG group were significantly higher than those in IR group (P＜0.01), LVEDP significantly lower than that in IR group (P＜0.01) at the same time. 　Conclusion:DG can protect left ventricular function against myocardial ischemia－reperfusion injury in rats.