Table 4.
Different parameters of blood pressure variability during baseline
| Time Domain | |||
|---|---|---|---|
| Parameters | SBP | MBP | DBP |
| CV | 2.87 ± 0.84 | 2.20 ± 0.62 | 2.24 ± 0.62 |
| VAR | 12.16 ± 6.58 | 4.42 ± 2.49 | 3.55 ± 1.91 |
| SDNN | 3.36 ± 0.96 | 2.03 ± 0.56 | 1.83 ± 0.49 |
| SENN | 0.18 ± 0.06 | 0.11 ± 0.03 | 0.10 ± 0.03 |
| SDSD | 1.68 ± 0.48 | 0.96 ± 0.25 | 1.14 ± 0.37 |
| RMSSD | 1.17 ± 0.48 | 0.96 ± 0.25 | 1.14 ± 0.37 |
| Frequency Domain | |||
| Parameters | SBP | MBP | DBP |
| LF | 27.84 ± 14.94 | 16.10 ± 6.99 | 13.50 ± 5.82 |
| LF (nu) | 67.38 ± 20.11 | 79.62 ± 12.03 | 71.71 ± 11.22 |
| HF | 11.29 ± 8.70 | 3.15 ± 2.51 | 2.67 (1.79-6.74) |
| HF (nu) | 27.75 ± 19.71 | 15.63 ± 11.30 | 21.87 ± 10.21 |
| TP | 127 ± 62.11 | 45.73 ± 24.12 | 36.64 ± 18.30 |
| LF/HF | 5.16 ± 5.41 | 8.29 ± 5.81 | 3.74 (2.20-7.60) |
Normally distributed data is expressed as mean ± SD, and non-parametric data is expressed as median (inter-quartile range). SBP, systolic blood pressure; MBP, mean blood pressure; DBP, diastolic blood pressure; CV, coefficient of variance; VAR, variance; SDNN, standard deviation of beat-to-beat BP or square root of the variance; SENN, standard error of beat-to-beat BP; SDSD, standard deviation of the differences between adjacent beat-to-beat BP; RMSSD, square root of the mean of the sum of the squares of differences between adjacent beat-to-beat BP; LF, absolute power in low-frequency band; nu, normalized unit; HF, absolute power in high-frequency band; TP, total power; LF/HF, ratio of LF-to-HF power.