Table 5.
Myocardial Infarction Characteristics by Mechanical Circulatory Support Status
| Characteristics | Preoperative MCS (n = 129) | Intra/Postop MCS (n = 279) | No MCS (n = 5,088) | p Valuea |
|---|---|---|---|---|
| Timing of MI | 0.0001 | |||
| ≤6 hours | 47 (36.4) | 118 (42.3) | 1,586 (31.2) | |
| 6–24 hours | 37 (28.7) | 67 (24.0) | 1,202 (23.6) | |
| 1–7 days | 45 (34.9) | 94 (33.7) | 2,300 (45.2) | |
| Resuscitation | 43 (33.3) | 108 (38.7) | 1,092 (21.5) | <0.0001 |
| Type of arrhythmia | 0.0027 | |||
| Afib/flutter | 14 (10.9) | 15 (5.4) | 455 (8.9%) | |
| Heart block | 4 (3.1) | 7 (2.5) | 102 (2.0%) | |
| Sustained VT/VF | 36 (27.9) | 90 (32.3) | 943 (18.5%) | |
| Multiple types | 2 (1.6) | 15 (5.4) | 241 (4.7%) | |
| LV ejection fraction | 25.0 (20.0–40.0) | 28.0 (20.0–43.0) | 35.0 (25.0–48.5) | <0.0001 |
| No. of diseased vessels | ||||
| None | 0 (0.0%) | 2 (0.7%) | 8 (0.2%) | 0.0001 |
| One | 12 (9.3%) | 12 (4.3%) | 203 (4.0%) | |
| Two | 24 (18.6%) | 70 (25.1%) | 862 (16.9%) | |
| Three | 93 (72.1%) | 195 (69.9%) | 4,012 (78.9%) | |
| Left main ≥50% stenosis | 70 (54.3%) | 131 (47.0%) | 2,615 (51.4%) | 0.2713 |
| Proximal LAD ≥70% stenosis | 84 (65.1%) | 175 (62.7%) | 3,251 (63.9%) | 0.8590 |
a
From statistical tests of the null hypothesis that the distribution of the factor was the same across the three groups.
Values are n (%) or median (interquartile range).
Afib = atrial fibrillation; LAD = left anterior descending artery; LV = left ventricle; MCS = mechanical circulatory support; MI = myocardial infarction; VT/VF = ventricular tachycardia/ventricular fibrillation.