Table 2.
Procedure-related indices and coronary angiography of patients with ACS treated with PCI according to winter and non-winter weeks in polluted and non-polluted regions
| All patients, N = 8740 | Winter weeks, N = 2408 | Non-winter weeks, N = 6332 | P value | |
|---|---|---|---|---|
| Vascular access (%) | ||||
| Femoral | 28.7 | 28.3 | 28.9 | 0.63 |
| Radial left | 13.8 | 13.1 | 14 | 0.27 |
| Radial right | 57.1 | 58 | 56.8 | 0.33 |
| Other | 0.4 | 0.6 | 0.3 | 0.07 |
| Coronary angiography (%) | ||||
| Single vessel disease | 52.4 | 44.8 | 48.2 | 0.009 |
| MVD | 41 | 47.9 | 44 | 0.002 |
| MVD + LMCA | 6.3 | 6.9 | 7.6 | 0.28 |
| Isolated LMCA | 0.3 | 0.4 | 0.2 | 0.27 |
| TIMI flow before PCI (%) | ||||
| 0 | 24.8 | 23.2 | 25.5 | 0.02 |
| I | 6.5 | 6.1 | 6.6 | |
| II | 15.8 | 15.8 | 15.8 | |
| III | 52.9 | 54.9 | 52.1 | |
| TIMI flow after PCI (%) | ||||
| 0 | 2.5 | 2.4 | 2.5 | 0.52 |
| I | 0.8 | 0.8 | 0.8 | |
| II | 3 | 3.3 | 2.9 | |
| III | 93.7 | 93.5 | 93.8 | |
| IVUS, % | 1.87 | 1.32 | 2.08 | 0.02 |
| FFR, % | 1.55 | 1.28 | 1.65 | 0.21 |
| Thrombectomy, % | 3.6 | 3.61 | 3.6 | 0.97 |
| Radiation, Gy | 0.991 ± 0.833 | 1.028 ± 0.828 | 0.977 ± 0.834 | 0.01 |
| Contrast dose, mL | 177.3 ± 82.1 | 177 ± 77.5 | 177.4 ± 83.8 | 0.81 |
IVUS intravascular ultrasound, FFR fractional-flow reserve, LMCA left main coronary artery, MVD multi-vessel disease, PCI percutaneous coronary intervention, TIMI thrombolysis in myocardial infarction