Table 4.
HRV analysis recorded in a standing position in patients with tVVS and controls
| Parameter | Syncope (n = 27) | No Syncope (n = 35) | p-value |
|---|---|---|---|
| Max RR (ms) | 847.1 ± 91.8 | 889.9 ± 194.2 | 0.30 |
| Min RR (ms) | 533.3 ± 128.9 | 574.7 ± 112.7 | 0.18 |
| Average RR (ms) | 686.9 ± 89.2 | 713.3 ± 143.4 | 0.41 |
| SDNN (ms) | 48.4 ± 8.9 | 51.7 ± 23.8 | 0.51 |
| RMSSD (ms) | 28.7 ± 16.0 | 31.8 ± 30.5 | 0.63 |
| HRV triangular index | 14.5 ± 2.6 | 15.1 ± 4.4 | 0.48 |
| NN50 | 15.5 ± 19.7 | 15.6 ± 21.9 | 0.98 |
| pNN50 | 1.3 ± 1.6 | 1.6 ± 2.5 | 0.58 |
| VLF (ms2) | 299.5 ± 105.1 | 290.8 ± 104.9 | 0.75 |
| LF (ms2) | 217.1 ± 86.8 | 233.8 ± 86.1 | 0.45 |
| HF (ms2) | 82.2 ± 52.2 | 104.2 ± 70.0 | 0.18 |
| Total power (ms2) | 753.9 ± 156.6 | 743.5 ± 146.4 | 0.79 |
RR time between two successive R-waves, HR heart rate, SDNN standard deviation of NN interval, RMSSD root mean square of successive differences, HRV Heart Rate Variability. NN50 number of times successive heartbeat intervals exceed 50ms. VLF very low frequency, LF low frequency, HF high frequency