ABSTRACT
Objective:To investigate the therapeutic effect of Qihong capsule on pentobarbital sodium induced heart failure in beagle dogs. Method:Thirty healthy adult beagle dogs were randomly divided into 6 groups, 6 in each group. They were normal group, model group, digoxin tablet group (40 μg·kg-1), Qihong capsule high, medium and low dose groups (2.6，1.3，0.65 g·kg-1). The heart failure model of beagle dogs was established by intravenous infusion of 2% pentobarbital sodium. The success standard of the model was that the maximum rate of rise of left ventricular pressure was reduced by 70%.The corresponding drugs were given through duodenum. The Ⅱ lead electrocardiogram, coronary blood flow, cardiac output, left ventricular pressure and maximum rate of left ventricular pressure rise were measured by multi-channel physiological recorder. The arterial oxygen content and coronary sinus oxygen content were measured by Roche blood oxygen analyzer at different time points, and the myocardial oxygen utilization rate was calculated. Result:After intravenous infusion of 2% pentobarbital sodium for about 15 minutes, beagle dogs began to show obvious symptoms of heart failure. The main manifestations were the increase of PR interval of Ⅱ lead electrocardiogram, the decrease of coronary blood flow, left ventricular pressure, cardiac output, cardiac output, venous oxygen content, and the increase of myocardial oxygen utilization rate (P<0.01) compared with the model group, Qihong capsule significantly increased coronary blood flow at 60-120 min after treatment (P<0.05). The cardiac output of 2.6 g·kg-1 Qihong capsule increased significantly at 45-60 min after treatment, with the maximum increase of about 16%, which was significantly different from that of model group (P<0.05). At the same time, it can increase the oxygen content of coronary sinus blood, which indicates that the myocardial oxygen supply is increased and the oxygen utilization rate is decreased. Qihong capsule 1.3 g·kg-1 group significantly increased the maximum rate of left ventricular pressure rise (P<0.05), the maximum increase rate was about 42%. Conclusion:Qihong capsule can increase coronary blood flow and venous blood oxygen content at the same time, make myocardial nutrient supply sufficient, reduce oxygen utilization rate, on this basis, Qihong capsule can further increase cardiac output and improve cardiac function, so as to play a protective role in heart failure.