Table 2. Angiographic and Procedural Findings of Patients in the Different IMR Groups.
| Total (n=113) | Low IMR (n=38) | Mid IMR (n=38) | High IMR (n=37) | p value | |
|---|---|---|---|---|---|
| QCA, mean±SD, mm | |||||
| RD | 2.86±0.50 | 2.86±0.43 | 2.83±0.56 | 2.88±0.52 | 0.901 |
| Lesion length | 16.82±5.26 | 16.19±4.95 | 16.81±5.26 | 17.46±5.61 | 0.584 |
| Stent diameter | 3.12±0.33 | 3.16±0.31 | 3.13±0.35 | 3.07±0.32 | 0.472 |
| Stent length | 25.37±8.60 | 23.16±6.83 | 26.80±9.43 | 26.11±9.06 | 0.143 |
| Coronary territory, n (%) | 0.266 | ||||
| LAD | 80 (70.8) | 25 (65.8) | 26 (68.4) | 29 (78.4) | |
| LCX | 9 (8.0) | 5 (13.2) | 1 (2.6) | 3 (8.1) | |
| RCA | 24 (21.2) | 8 (21.1) | 11 (28.9) | 5 (13.5) | |
| Coronary intervention, n (%) | |||||
| Thrombus aspiration | 57 (50.4) | 15 (39.5) | 20 (52.6) | 22 (59.5) | 0.212 |
| Direct stenting | 50 (44.2) | 12 (31.6) | 20 (52.6) | 18 (48.6) | 0.146 |
| Use of GP IIb/IIIa inhibitors | 18 (15.9) | 6 (15.8) | 6 (15.8) | 6 (16.2) | 0.998 |
| Lesion location | 0.008 | ||||
| Proximal lesion | 56 (49.6) | 11 (28.9) | 23 (60.5) | 22 (59.5) | |
| Non-proximal lesion | 57 (50.4) | 27 (71.1) | 15 (39.5) | 15 (40.5) | |
| ACC/AHA classification, n (%) | 0.566 | ||||
| A | 9 (8.0) | 3 (7.9) | 3 (7.9) | 3 (8.1) | |
| B1 | 16 (14.2) | 8 (21.1) | 6 (15.8) | 2 (5.4) | |
| B2 | 60 (53.1) | 20 (52.6) | 18 (47.4) | 22 (59.5) | |
| C | 28 (24.8) | 7 (18.4) | 11 (28.9) | 10 (27.0) | |
| TIMI grade and TMPG, n (%) | |||||
| Initial TIMI | 0.008 | ||||
| 0/1 | 77 (68.1) | 21 (55.3) | 26 (68.4) | 30 (81.1) | |
| 2 | 18 (15.9) | 6 (15.8) | 10 (26.3) | 2 (5.4) | |
| 3 | 18 (15.9) | 11 (28.9) | 2 (5.3) | 5 (13.5) | |
| Final TIMI | 0.015 | ||||
| 0/1 | 0 | 0 | 0 | 0 | |
| 2 | 31 (27.4) | 5 (13.2) | 10 (26.3) | 16 (43.2) | |
| 3 | 82 (72.6) | 33 (86.8) | 28 (73.7) | 21 (56.8) | |
| TMPG | 0.008 | ||||
| 0/1 | 15 (13.3) | 2 (5.3) | 5 (13.2) | 8 (21.6) | |
| 2 | 45 (39.8) | 10 (26.3) | 16 (42.1) | 19 (51.4) | |
| 3 | 53 (46.9) | 26 (68.4) | 17 (44.7) | 10 (27.0) |
IMR, index of microcirculatory resistance; QCA, quantitative coronary angiography; SD, standard deviation; RD, reference diameter; LAD, left anterior descending artery; LCX, left circumflex artery; RCA, right coronary artery; GP IIb/IIIa, glycoprotein IIb/IIIa; ACC/AHA, American College of Cardiology/American Heart Association; TIMI, Thrombolysis in Myocardial Infarction; TMPG, TIMI myocardial perfusion grade.