Table 4

Mean values of the QT dispersion and conventional ECG measurements

Supine-ASittingStanding-AInspirationExpirationSupine-BStanding-B
Global QT dispersion (ms)21.3 (12.4)20.9 (11.4)20.6 (10.8)21.2 (11.0)21.3 (12.6)19.9 (11.9)20.8 (10.6)
Precordial QT dispersion (ms)10.2 (7.6)8.6 (6.1)4-150 8.0 (6.7)4-150 10.6 (7.8)9.6 (6.6)10.1 (8.4)8.7 (6.6)4-150
Global QT-SD (ms)6.5 (3.4)6.3 (3.2)6.5 (3.6)6.5 (3.1)6.5 (3.6)6.1 (3.5)6.6 (3.5)
Precordial QT-SD (ms)4.4 (3.2)3.7 (2.5)4-150 3.6 (3.0)4-150 4.5 (3.3)4.1 (2.7)4.3 (3.5)3.9 (3.2)4-150
Heart rate (beats/min)67.2 (9.9)69.4 (9.5)4-150 78.3 (10.5)4-150 69.4 (10.3)4-150 68.0 (9.9)67.4 (9.4)79.2 (11.5)4-150
PR interval (ms)152 (20)150 (20)4-150 144 (17)4-150 147 (20)4-150 150 (22)4-150 151 (19)143 (19)4-150
QRS duration (ms)90 (8)87 (8)4-150 85 (7)4-150 87 (7)4-150 88 (8)4-150 90 (8)84 (7)4-150
QT interval (ms)383 (25)375 (23)4-150 358 (20)4-150 378 (24)4-150 380 (26)4-150 383 (26)357 (24)4-150
QTc interval (ms)402 (14)400 (13)4-150 406 (14)4-150 403 (15)401 (14)403 (15)406 (15)4-150
  • Values are mean (SD).

  • 4-150 p < 0.05 v mean values in supine position.

  • A, study A; B, study B; QT-SD, QT standard deviation.