Table 2.
Heart rate variability and heartprint indices evaluated from recordings before tachyarrhythmia (ventricular tachycardia (VT)/ventricular fibrillation (VF)) or control recordings for both datasets. Data are shown as medians (25th percentile–75th percentile).
| MARITA | MVTDB | |||
|---|---|---|---|---|
| Before VT/VF (N = 33) |
Control (N = 35) |
Before VT/VF (N = 135) |
Control (N = 135) |
|
| meanNN (ms) | 705 (610–784) | 759 (678–873) * | 676 (607–819) | 787 (707–898) * |
| SDNN (ms) | 46 (28–71) | 41 (30–78) | 49 (34–77) | 50 (27–78) |
| RMSSD (ms) | 15 (11–24) | 15 (12–20) | 18 (13–31) | 20 (13–35) |
| pNN50 (%) | 2.00 (0.50–6.71) | 1.00 (0.40–3.50) | 0.49 (12.38–2.09) | 2.75 (0.49–2.75) |
| LFnu | 49.4 (42.2–63.2) | 56.5 (52.7–67.5) & | 45.2 (33.5–56.2) | 50.1 (39.3–60.6) * |
| HFnu | 25.7 (20.3–32.5) | 16.9 (12.1–32.5) & | 31.3 (21.5–42.9) | 29.6 (20.0–38.7) |
| LF/HF | 1.6 (1.0–3.1) & | 2.7 (2.0–3.9) *,& | 1.2 (0.7–2.4) | 1.6 (0.9–2.3) * |
| meanNN l.m. (ms) | 625 (560–801) | 764 (676–823) *,& | 625 (532–734) | 803 (726–954) * |
| SDNN l.m. (ms) | 19 (13–35) & | 22 (15–31) | 65 (39–90) | 24 (13–38) * |
| PVCs/hour ¶ | 154 (63–500) | 79 (11–181) * | 159 (42–433) | 71 (11–351) * |
| meanCI (ms) ¶ | 485 (444–522) | 493 (446–553) & | 520 (446–592) | 575 (509–636) * |
| SDCI (ms) ¶ | 41 (32–71) | 59 (30–75) | 63 (46–78) | 57 (37–88) |
| sNIB ¶ | 14 (2–36) | 4 (1–9) | 9 (3–25) | 5 (1–22) |
| NIB mode ¶ | 2 (1–3) | 2 (1–8) | 1 (0–4) | 2 (0–7) |
l.m.: last minute; * p-value < 0.05 (before VT/F vs. control); & p-value < 0.05 (MARITA vs. MVTDB); ¶ heartprint indices.