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Figure 1 Echocardiographic variables of sham-operated rats (SH) (n = 6), SH rats treated with high-dose guanethidine (SH+HG) (n = 7), rats with myocardial infarction receiving vehicle (MI) (n = 12), and MI rats treated with low-dose guanethidine (MI+LG) (n = 13), medium-dose guanethidine (MI+MG) (n = 8), and high-dose guanethidine (MI+HG) (n = 3). *p < 0.05 vs. sham-operated rats. p < 0.05 vs. MI rats. p < 0.05 vs. MI+LG rats. The difference between MI+HG rats and the other groups was not compared because of the small number. Data are presented as the mean value ± SD. FS = fractional shortening of left ventricle; LVEDD and LVESD = left ventricular end-diastolic and end-systolic dimension, respectively.