Table 2.
Comparison of autonomic parameters evaluated by spectral analysis between healthy controls and patients in supine (a) and orthostatic position (b).
| Healthy Controls n = 49 |
LTx List Patients n = 49 |
p | |
|---|---|---|---|
| (a) SUP | |||
| Heart rate, median (IQR) bpm | 62 (58–71) | 88 (79–99) | <0.0001 |
| Spectral analysis, median (IQR) | |||
| Total power, ms 2 | 2037 (1114–3706) | 533 (180–1051) | <0.0001 |
| LFnu | 31 (22–43) | 64 (36–82) | <0.0001 |
| HFnu | 66 (53–74) | 21 (8–36) | <0.0001 |
| LF/HF | 0.46 (0.34–0.81) | 2.81 (1.30–9.00) | <0.0001 |
| RR-RESP HFk 2 | 0.86 (0.77–0.92) | 0.85 (0.50–0.93) | 0.26 |
| RESP HF, Hz | 0.25 (0.22–0.30) | 0.34 (0.26–0.39) | <0.0001 |
| (b) ∆ORT | |||
| Heart rate, median ∆ORT (IQR) % | 22 (9–38) | 12 (9–16) | <0.0001 |
| Spectral analysis, median ∆ORT (IQR) % | |||
| Total power | −31 (−56–22) | −23 (−56–42) | 0.51 |
| LFnu | 105 (49–274) | 5 (−20–33) | <0.0001 |
| HFnu | −57 (−77–−39) | −1 (−55–50) | <0.0001 |
| LF/HF | 438 (204–1546) | 9 (−60–188) | <0.0001 |
n, number; LTx, transplant list; IQR 25–75, interquartile range; SUP, supine; bpm, beats per minute; ms2, milliseconds2; LF, low frequency; HF, high frequency; nu, normalized; LF/HF, sympatho–vagal balance; RR, R-R interval; RESP, respiratory; K2, coherence; Hz, Hertz; ∆, delta; ORT, orthostatism.