Table 4.
QT Interval Measurement
| Mitral Valve Prolapses | Healthy Relatives | Healthy Volunteers | P Valuea | |
|---|---|---|---|---|
| QT end (ms) | 409.47 ± 52.14 | 372.13 ± 23.48 | 375.65 ± 25.34 | 0.015/0.004/NS |
| QTc end (ms) | 446.45 ± 35.87 | 426.52 ± 17.71 | 430.35 ± 18.01 | 0.027/0.05/NS |
| QT apex (ms) | 318.87 ± 41.94 | 286.33 ± 22.81 | 289.13 ± 22.97 | 0.001/0.001/NS |
| QTc apex (ms) | 347.59 ± 29.09 | 327.99 ± 17.45 | 331.09 ± 16.75 | 0.003/0.01/NS |
| QT end day (ms) | 389.77 ± 52.94 | 355.53 ± 21.35 | 356.61 ± 23.35 | 0.004/0.005/NS |
| QTc end day (ms) | 447.41 ± 35.60 | 429.29 ± 17.66 | 432.62 ± 18.14 | 0.05/NS/NS |
| QT apex day (ms) | 301.00 ± 45.15 | 269.87 ± 20.99 | 269.87 ± 20.56 | 0.002/0.002/NS |
| QTc apex day (ms) | 344.74 ± 30.83 | 325.67 ± 17.77 | 327.27 ± 16.47 | 0.005/0.02/NS |
| QT end night (ms) | 442.43 ± 49.81 | 404.50 ± 27.84 | 409.03 ± 34.34 | 0.001/0.01/NS |
| QTc end night (ms) | 448.23 ± 38.75 | 421.92 ± 19.22 | 426.49 ± 20.55 | 0.004/0.01/NS |
| QT apex night (ms) | 348.17 ± 37.22 | 319.80 ± 27.30 | 324.68 ± 32.31 | 0.001/0.01/NS |
| QTc apex night (ms) | 352.21 ± 28.30 | 333.37 ± 19.17 | 338.21 ± 19.40 | 0.005/0.05/NS |
aMitral valve prolapses versus healthy relatives/mitral valve prolapses versus healthy volunteers/healthy relatives versus healthy volunteers.