Holter analysis
Average QTe was significantly longer, and QTe/RR and QTa/RR slopes from entire 24-hour Holter recordings were significantly steeper in the LQT2 patients than those in the LQT1 patients (472.0 +/- 40.6 vs 447.1 +/- 44.8ms, P = 0.037; 0.262 +/- 0.063 vs 0.204 +/- 0.055, P = 0.0007; 0.233 +/- 0.052 vs 0.181 +/- 0.040, P = 0.0002, respectively). Representative QT trend graph in both groups are shown in Figure 2 , and representative QTa/RR slopes from entire 24-hour, daytime and night time Holter recordings in both groups are shown in Figure 3-5 , respectively. QTe/RR and QTa/RR slopes from daytime Holter recordings in the LQT2 patients were also significantly steeper than those in the LQT1 patients (0.197 +/- 0.057 vs 0.158 +/- 0.066, P = 0.024; 0.190 +/- 0.048 vs 0.153 +/- 0.050, P = 0.008, Table 1). There were no significant differences in the other parameters (Table 1 ).