茶色素对心肌缺血离体蟾蜍心脏活动的影响

目的 观察茶色素在心肌缺血状态下对离体蟾蜍心肌收缩力、心电图和心率的影响.方法 将60只蟾蜍分为正常蟾蜍离体蛙心组(A组)和心肌缺血蟾蜍离体蛙心组(B组),A组再分为林格液组(A1组)、茶色素低剂量(200 mg/L)组(A2组)和茶色素高剂量(400 mg/L)组(A3组);B组再分垂体后叶素模型组(B1组)、垂体后叶素+茶色素低剂量(200 mg/L)组(B2组)和垂体后叶素+茶色素高剂量(400 mg/L)组(B3组).应用BL-420S生物机能实验系统记录蟾蜍离体心肌收缩力和心电图变化曲线.结果 与A1组比较,A3组引起心肌收缩力明显增加(P＜0.05),A2组差异无统计学意义(P＞0.05);心电图QRS峰峰值和心率差异无统计学意义(P＞0.05).与A1组比较,B1组心肌收缩力、心电图QRS峰峰值和心率均明显下降(P＜0.05);与B1组比较,B2、B3组心肌收缩力、心电图QRS峰峰值和心率均明显上升(P＜0.05).结论 茶色素能明显改善心肌缺血引起离体蟾蜍心脏功能的下降.

Influence of tea pigment on cardiac activity in exsomatized toads of myocardial ischemia

Objective To observe the influence of tea pigment on myocardial contractility,electrocardiogram(ECG) and heart rate in exsomatized toads under the condition of myocardialischemia.Methods Sixty toads were divided into the normal exsomatized toad heart group(A) and myocardial ischemia toad heart(B).Then the group A was re-divided into the Ringer's solution group (A1),tea pigment low dose(200 mg/L) group(A2) and the high dose(400 mg/L) group(A3);the group B was re-divided into the pituitrin model group(B1),pituitrin + tea pigment low dose(200 mg/L) group(B2) and high dose(400 mg/L) group(B3).The BL-420S biological function experiment system was used to record the myocardial contractile force and ECG change curve of exsomatized toad.Results Compared with the group A1,the myocardial contractility in the group A3 was obviously increased(P＜0.05),the difference in the group A2 had no statistical significance(P＞0.05);the QRS peak value of ECG and heart rate had no statistically significant difference(P＞0.05);compared with the group A1,the myocardial contractility,ECG QRS peak value and heart rate in the group B1 were significantly decreased(P＜0.05);compared with the group B1,the myocardial contractility,ECG QRS peak value and heart rate in the group B2 and B3 were significantly increased(P＜0.05).Conclusion Tea pigment can obviously improve the decrease of the exsomatized toad cardiac activity caused by myocardial ischemia.