[Protective effect of total glycosides of Ranunculus japonicus on myocardial ischemic-reperfusion injury in isolated rat hearts].

Objectives: To study the protective effect of total glycosides of Ranunculus japonicus (TGRJ) on myocardial ischemic-reperfusion injury in isolated rat hearts.

Methods: The SD rats were randomly divided into normal control group, ischemia-reperfusion group, and TGRJ in 0.05, 0.10 and 0.20 mg/mL groups. The ischemia-reperfusion injury model was built using Langendroff isolated rats hearts perfusion system. The indexes of heart function such as heart rate (HR), left ventricular systolic pressure (LVSP), left ventricular systolic pressure maximum rate of rise (+ dp/dt(max)), left ventricular diastolic pressure maximum rate of descent (-dp/dt(max)) and coronary flow (CF) before ischemia and later at 1, 5, 10, 20, 30 and 40 min after reperfusion were recorded. The activity of Lactate dehydrogenase (LDH) and creatine kinase (CK) at 20 and 40 min after reperfusion were determined. The myocardial tissues were stained with Triphenyltetrazolium chloride (TTC) and the percentage of myocardial infarction area was calculated.

Results: HR, LVDP, +dp/dt(max) and CF of the I/R group were significantly decreased after reperfusion, LDH and CK levels were increased and the area of myocardial infraction was 58.78%. TGRJ had improving effect on all above indexes.

Conclusion: TGRJ has protective effet on the myo- cardial ischemic-reperfusion injury.