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Figure 2 (A to C) Mean hourly heart rate (HR) as influenced by treatment regimen(s) during ambulatory 24-h electrocardiogram. Points with an asterisk represent significant differences in HR between groups. At baseline, by chance, the ventricular rate tended to be higher in the carvedilol-treated group throughout 24 h, but this difference was only statistically significant for a few hours. Analyses are intergroup changes from baseline values.