Effect of Nar on cardiac function in diabetic MI/R rats. (A) LVSP, (B) LVEDP, (C) +dP/dtmax and (D) -dP/dtmax were recorded using a hemodynamic monitoring system. Data are presented as the mean ± SEM (number of repeated measurements: n=6-8/group). *P<0.05, **P<0.01 and ***P<0.001 compared with the STZ-sham group; #P<0.05 and ##P<0.01 compared with the STZ-M/IR group. STZ, streptozotocin; MI/R, myocardial ischemia reperfusion; Nar, naringenin; LVSP, left ventricular systolic pressure; LVEDP, left ventricular end-diastolic pressure; +dP/dtmax, peak rate of left ventricular maximal systolic/diastolic velocity rise; -dP/dtmax, peak rate of left ventricular maximal systolic/diastolic velocity fall.