Table 2.
Summary of repolarization parameters for all groups.
| Parameter (Mean ± SD) | NORMAL (n=7) | LQT1 (n=9) | LQT2 (n=9) | LQT3 (n=5) | LQT5 (n=2) |
|---|---|---|---|---|---|
| RT (ms) | 257± 15 | 372 ± 30 | 369 ± 42 | 404 ± 35 | 343 ± 24 |
| ΔRT (ms) | 16 ± 12 | 95 ± 19 | 134 ± 37 | 112 ± 9 | 136 ± 23 |
| ΔRT/Δx (ms/cm) | 5.0 ± 3.0 | 89 ± 18 | 115 ± 25 | 133 ± 6 | 134 ± 13 |
| ARIc (ms) | 235 ± 21 | 316 ± 28 | 307 ± 36 | 335 ± 18 | 288 ± 36 |
| ΔARIc (ms) | 19 ± 13 | 99 ± 20 | 136 ± 36 | 110 ± 14 | 139 ± 28 |
| ΔARIc/Δx (ms/cm) | 2.0 ± 2.0 | 92 ± 18 | 117 ± 29 | 129 ± 14 | 137 ± 17 |
All results were statistically significant (P < 0.05 for each LQTS type versus control). However, LQT5 group had only two patients. The difference in mean ARIc between control and LQT5 group was not statistically significant. Online Supplement Section 4 provides graphs showing pairwise comparisons between control and each LQTS group.