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Figure 3 Maximal T-wave peak to T-wave end (TPE) intervals (higher two lines) and median TPE intervals, calculated from all beats (lower two lines), at specified heart rates before the treatment with beta-blockers (broken lines) and during the treatment with beta-blockers (solid lines) in 24 long-QT syndrome type 1 (LQT1) patients. *p < 0.05 before the treatment versus during the treatment with beta-blockers at RR intervals from 600 to 700 ms.