TABLE 2.
The comparison of the median of heart rate (RR interval) and blood pressure (systolic, sBP; diastolic, dBP; and pulse pressure, PP) variability descriptors between supine (S) and tilt (T) phases of the head-up tilt test in the vasovagal patients’ group (VVS (+)) and control group (VVS (–)). The variability descriptors are beat-to-beat and slow variability (SD1 and SD2, respectively) and mean values of the biosignal obtained for each subject.
| VVS(–) | VVS(+) | |||||
|---|---|---|---|---|---|---|
| Median S) | Median T) | p-value | Median S) | Median T) | p-value | |
| RR (ms) | ||||||
| Mean | 860.53 | 726.39 | < 0.001 | 858.60 | 687.48 | < 0.001 |
| SD1 | 25.34 | 14.47 | < 0.001 | 24.53 | 14.33 | < 0.001 |
| SD2 | 64.87 | 63.84 | 0.623 | 67.27 | 66.37 | 0.562 |
| sBP (mmHg) | ||||||
| Mean | 114.55 | 122.62 | < 0.001 | 110.51 | 123.93 | < 0.001 |
| SD1 | 1.17 | 1.62 | 0.096 | 1.33 | 1.89 | 0.528 |
| SD2 | 5.88 | 8.54 | < 0.001 | 7.21 | 10.90 | 0.065 |
| dBP (mmHg) | ||||||
| Mean | 76.14 | 86.66 | < 0.001 | 68.79 | 84.70 | < 0.001 |
| SD1 | 1.03 | 1.30 | 0.014 | 1.34 | 1.25 | 0.433 |
| SD2 | 5.12 | 6.89 | < 0.001 | 6.35 | 7.93 | 0.044 |
| PP (mmHg) | ||||||
| Mean | 34.93 | 34.00 | 0.096 | 39.54 | 37.71 | 0.231 |
| SD1 | 1.69 | 1.67 | 0.953 | 1.88 | 1.51 | 0.117 |
| SD2 | 3.71 | 4.75 | 0.001 | 5.05 | 5.99 | 0.348 |