Table 3.
HRV analysis with deep breathing test in patients with tVVS and controls
| Parameter | Syncope (n = 38) | No Syncope (n = 51) | p-value |
|---|---|---|---|
| Minimum inspiratory HR (bpm) | 56.3 ± 8.8 | 56.1 ± 8.6 | 0.92 |
| Maximum expiratory HR (bpm) | 95.5 ± 8.9 | 99.3 ± 21.6 | 0.31 |
| SDNN (ms) | 115.8 ± 37.5 | 121.5 ± 41.1 | 0.50 |
| ΔE/I | 39.2 ± 9.1 | 43.1 ± 19.7 | 0.25 |
| E/I ratio | 1.7 ± 0.3 | 1.8 ± 0.3 | 0.36 |
| RMSSD (ms) | 88.4 ± 43.5 | 89.8 ± 49.9 | 0.89 |
| VLF (ms2) | 72.3 ± 57.6 | 93.9 ± 88.2 | 0.19 |
| LF (ms2) | 413.7 ± 87.6 | 397.6 ± 100.5 | 0.43 |
| HF (ms2) | 116.3 ± 56.3 | 121.5 ± 66.2 | 0.70 |
| Total power (ms2) | 609.3 ± 65.9 | 621.6 ± 71.3 | 0.41 |
RR time between two successive R-waves, HR heart rate, SDNN standard deviation of NN interval, ΔE/I = Maximum heart rate during expiration subtracted by minimum heart rate during inspiration, E/I ratio Ratio of maximum and minimum heart rate during expiration and inspiration, RMSSD root mean square of successive differences, VLF very low frequency, LF low frequency, HF high frequency