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Figure 3 Changes in maximal exercise treadmill test (ETT) duration in the four patient groups analyzed in the study. At the end of 12 weeks, patients who continued digoxin in each of the serum concentration groups had a significantly better exercise capacity than patients who discontinued digoxin (*p value for all three serum digoxin groups vs. placebo [digoxin withdrawal]). SDC = serum digoxin concentration.
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