Table 1.
Demographic and HRV characteristics of the patients.
| Characteristics | MACE Group (n = 25) | Non-MACE Group (n = 76) | p | Mortality (n = 6) | Non-mortality (n = 95) | p |
|---|---|---|---|---|---|---|
| Age, years (mean ± SD) | 73.08 ± 10.83 | 70.13 ± 9.64 | 0.201 | 74.33 ± 7.20 | 70.64 ± 10.11 | 0.382 |
| Gender | ||||||
| Male | 17 | 52 | 0.969 | 3 | 66 | 0.320 |
| Female | 8 | 24 | 3 | 29 | ||
| Heart rate, b.p.m (mean ± SD) | 81.44 ± 13.60 | 81.16 ± 18.86 | 0.945 | 75.17 ± 13.44 | 81.61 ± 17.86 | 0.388 |
| LVEF | ||||||
| <50 % | 16 | 35 | 0.119 | 3 | 48 | 0.98 |
| ≥50 % | 9 | 41 | 3 | 47 | ||
| Killip Classification | ||||||
| Class I | 17 | 65 | 0.052 | 5 | 77 | 0.89 |
| Class II - IV | 8 | 11 | 1 | 18 | ||
| Multivessel coronary artery disease | ||||||
| No | 5 | 36 | 0.016 | 0 | 41 | 0.037 |
| Yes | 20 | 40 | 6 | 54 | ||
| Heart rate variabity | ||||||
| SDNN, ms (mean ± SD) | 14.93 ± 6.71 | 22.60 ± 10.44 | <0.001 | 11.67 ± 4.28 | 21.19 ± 10.17 | 0.025 |
| rMSSD, ms (mean ± SD) | 18.57 ± 11.08 | 25.44 ± 12.38 | 0.014 | 13.20 ± 3.63 | 24.33 ± 12.45 | 0.032 |
Abbreviations: SD - Standard deviation, MACE - Major adverse cardiovascular events, LVEF – Left ventricular ejection fraction, SDNN - Standard deviation of all normal R–R intervals), rMSSD - Square root of the average number of squared differences between consecutive normal R–R intervals.