Relation between maximum heart rate corrected QT interval (QTc max) and heart rate variability (HRV)
| Spearman r | Spearman two tailed p value | |
|---|---|---|
| Figures in brackets refer only to patients with ⩾70% of data analysed (n = 167). | ||
| RMSSD, square root of the mean of the sum of squares of differences between adjacent filtered RR intervals of the analysed time period; SDANN, standard deviation of the means of all filtered RR intervals for all five minute epochs of the analysed time period; SDNN, standard deviation of normal to normal RR intervals. | ||
| 24 hour HRV triangular index | −0.3 (−0.3) | <0.001 (<0.001) |
| SDNN | −0.3 (−0.3) | <0.001 (<0.001) |
| SDANN | −0.3 (−0.3) | <0.001 (<0.001) |
| RMSSD | −0.2 (−0.1) | 0.035 (0.063) |