651627.fig.001a
(a)
651627.fig.001b
(b)
651627.fig.001c
(c)
651627.fig.001d
(d)
Figure 1: Cardiac output of isolated working hearts in the pacing and ISO treatment. All data are mean ± SEM. (a) Cardiac output of isolated working hearts in different rates of pacing. The hearts. *   versus  baseline. (b) Cardiac output in different concentrations of ISO treatment. The hearts in each ISO concentration. * or **   versus  baseline. (c) The percentage increases in cardiac output in the heart rate increment of 60 beats/min. The hearts for each group. *   versus the pacing group. (d) The percentage increases in cardiac output at the pacing of 420 beats/min without and with ISO treatment. The hearts in each ISO concentration. * or **   versus baseline.