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Figure 2 Data from 24-h electrocardiographic recordings during normal daily activities in the long-QT syndrome type 1 (LQT1) and 2 (LQT2) groups showing maximal QT intervals (two higher lines) and QT intervals at stable heart rates (two lower lines) in symptomatic (solid lines) and asymptomatic (broken lines) patients. Separate data points show the QT versus RR intervals at the moment of maximal T2- to T1-wave amplitude ratios in symptomatic (closed symbols) and asymptomatic (open symbols) patients.
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