TABLE 2.
Comparisons of baseline heart rate variability (HRV) and heart rate (HR) dynamics indices between survivors and non-survivors.
| Index, median (IQR) | LVEF ≤35% |
LVEF >35% |
||||
| Survivor | Non-survivor | P* | Survivor | Non-survivor | P* | |
| DC (ms) | 4.2(3.1−6.2) | 2.9(2.3−3.6) | 0.0002 | 5.3(3.7−6.7) | 2.7(2.2−3.8) | <0.0001 |
| SDNN (ms) | 87(63−109) | 56(47−73) | 0.0004 | 90(69−118) | 65(54−78) | 0.0008 |
| α1 | 1.2(0.9−1.3) | 0.8(0.6−1.1) | 0.002 | 1.2(1−1.3) | 0.8(0.7−1.2) | 0.001 |
| ULF [ln(ms2)] | 8.6(7.9−9.1) | 7.7(7.3−8.3) | 0.0005 | 8.7(8−9.2) | 8(7.6−8.4) | 0.001 |
| VLF [ln(ms2)] | 6.7(6−7.3) | 5.7(4.9−6.1) | 0.0002 | 6.8(6−7.5) | 5.4(4.6−6.3) | <0.0001 |
| LF[ln(ms2)] | 5.4(4.3−6.4) | 4.1(3.5−4.8) | 0.0005 | 5.6(4.6−6.3) | 4.7(2.8−5.3) | 0.0003 |
| Acv [ln(ms)] | 3.9(3.5−4.3) | 3.3(3−3.6) | <0.0001 | 4.2(3.7−4.5) | 3.2(2.9−3.7) | <0.0001 |
| λ25s | 0.5(0.5−0.7) | 0.6(0.4−0.7) | 0.7 | 0.5(0.5−0.6) | 0.6(0.5−0.6) | 0.002 |
| rMSSD (ms) | 20(14−34) | 16(12−24) | 0.1 | 23(16−33) | 15(11−29) | 0.01 |
| pNN50 (%) | 2.6(0.4−10.7) | 0.8(0.1−4.8) | 0.09 | 3.1(0.8−10.2) | 0.5(0.1−6.8) | 0.01 |
| HF [ln(ms2)] | 4.4(3.5−5.5) | 3.6(2.9−4.5) | 0.03 | 4.6(3.9−5.5) | 3.5(3−5.2) | 0.009 |
*Significance of difference by Wilcoxon two sample test. Abbreviations are explained in the legend of Figure 1.