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Table 2 Postural changes of ECG measurements

From: Problems with Bazett QTc correction in paediatric screening of prolonged QTc interval

  Girls Boys
Heart rate QTcBazett QTcFridericia QTcFramingham Heart Rate QTcBazett QTcFridericia QTcFramingham
Sitting-supine 14.72 ± 7.85 10.66 ± 8.14 −1.83 ± 4.70 −3.25 ± 5.06 12.02 ± 7.62 8.68 ± 7.90 −1.66 ± 3.65 −2.51 ± 3.65
< 0.0001 < 0.0001 < 0.0001 < 0.0001 < 0.0001 < 0.0001 < 0.0001 < 0.0001
Standing-supine 23.87 ± 9.84 19.63 ± 11.69 −0.04 ± 7.50 −3.65 ± 7.27 23.06 ± 10.43 19.65 ± 11.22 0.57 ± 5.50 −2.55 ± 5.42
< 0.0001 < 0.0001 NS < 0.0001 < 0.0001 < 0.0001 NS < 0.0001
  1. For the position changes from supine to sitting and supine to standing, the table shows changes in heart rate (in beats per minute) and in QTc intervals according to the considered QTc formulas (in milliseconds). For the positional changes, the table also shows p-value (bottom numbers) of the paired t-test comparing the sitting and standing values with the supine values. The only significant differences between girls and boys were for the sitting vs supine heart rates (p = 0.0017) and for the sitting vs supine Bazett corrected QTc intervals (p = 0.025)