Table 3.
Reproducibility of QT Interval Determinations in Two Separate Recordings at Rest in Healthy Subjects and LQTS Patients
| All (n = 21) | Healthy (n = 11) | LQTS (n = 10) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Test 1 | Test 2 | CV (%) | Test 1 | Test 2 | CV (%) | Test 1 | Test 2 | CV (%) | |
| Heart rate (beats/min) | 65 ± 11 | 71 ± 10 | 11.0 | 63 ± 10 | 66 ± 7 | 9.9 | 66 ± 11 | 76 ± 11 | 12.1 |
| QT end interval (ms) | 391 ± 30 | 378 ± 25 | 4.4 | 373 ± 19 | 370 ± 23 | 3.5 | 411 ± 29 | 388 ± 24 | 5.2 |
| QT peak interval (ms) | 307 ± 26 | 299 ± 23 | 4.2 | 296 ± 22 | 292 ± 24 | 3.2 | 320 ± 25 | 306 ± 20 | 5.0 |
| Tp‐e interval (ms) | 85 ± 16 | 78 ± 12 | 10.2 | 77 ± 12 | 75 ± 8 | 5.5 | 92 ± 16 | 82 ± 14 | 12.2 |
| QTcB interval (ms) | 404 ± 34 | 408 ± 32 | 4.4 | 383 ± 24 | 385 ± 20 | 5.3 | 427 ± 29 | 434 ± 20 | 3.4 |
| QTcF interval (ms) | 399 ± 28 | 398 ± 26 | 3.5 | 379 ± 17 | 380 ± 19 | 4.3 | 421 ± 21 | 418 ± 17 | 2.7 |
Figures represent the mean ± SD in the study cohorts.