Table 2.
Comparison of procedural characteristics between the IVUS-crossable group and IVU-uncrossable group.
| All (n = 284) | IVUS-crossable group (n = 150) | IVUS-uncrossable group (n = 134) | P value | |
|---|---|---|---|---|
| Procedural characteristics | ||||
| Guiding catheter size and system | 0.081 | |||
| 6Fr—n, (%) | 4 (1.4) | 0 (0) | 4 (3.0) | |
| 7Fr—n, (%) | 257 (90.5) | 136 (90.7) | 121 (90.3) | |
| 8Fr—n, (%) | 23 (8.1) | 14 (9.3) | 9 (6.7) | |
| Intra-aortic balloon pump support—n, (%) | 20 (7.0) | 11 (7.3) | 9 (6.7) | 1.000 |
| Any balloon dilatation or try to balloon dilatation before RA—n, (%) | 28 (9.9) | 11 (7.3) | 17 (12.7) | 0.163 |
| Guidewire used during rotational atherectomy | 0.003 | |||
| RotaWire floppy—n, (%) | 216 (76.1) | 122 (81.3) | 94 (70.1) | |
| RotaWire extra support—n, (%) | 40 (14.1) | 22 (14.7) | 18 (13.4) | |
| Guidewire switch from floppy to extra support—n, (%) | 23 (8.1) | 6 (4.0) | 17 (12.7) | |
| Guidewire switch from extra support to floppy—n, (%) | 5 (1.8) | 0 (0) | 5 (3.7) | |
| Number of burrs used | 1.2 ± 0.5 | 1.3 ± 0.5 | 1.2 ± 0.5 | 0.554 |
| Initial burr size | < 0.001 | |||
| 1.25-mm | 76 (26.8) | 23 (15.3) | 53 (39.6) | |
| 1.5-mm | 208 (73.2) | 127 (84.7) | 81 (60.4) | |
| Final burr size | < 0.001 | |||
| 1.25-mm | 66 (23.2) | 17 (6.0) | 49 (17.3) | |
| 1.5-mm | 173 (60.9) | 100 (66.7) | 73 (54.5) | |
| 1.75-mm | 12 (4.2) | 8 (5.3) | 4 (3.0) | |
| 2.0-mm | 33 (11.6) | 25 (16.7) | 8 (6.0) | |
| Initial burr-to-artery ratio | 0.63 ± 0.16 | 0.61 ± 0.15 | 0.66 ± 0.16 | 0.008 |
| Final burr-to-artery ratio | 0.66 + 0.17 | 0.65 + 0.16 | 0.68 + 0.18 | 0.163 |
| Total run time (s) | 91.8 ± 73.2 | 72.8 ± 59.5 | 115.1 ± 80.6 | < 0.001 |
| Mean single run time (s) | 12.8 ± 3.1 | 11.9 ± 2.6 | 13.7 ± 3.4 | < 0.001 |
| Mean rotational speed (× 1,000 rpm) | 173.2 ± 10.1 | 171.6 ± 10.6 | 175.0 ± 9.1 | 0.021 |
| Maximum speed reduction during rotational atherectomy (rpm) (n = 281) | 6,630 ± 5,166 | 6,228 ± 6,007 | 7,083 ± 3,987 | 0.001 |
| Systolic blood pressure just before rotational atherectomy (mmHg) | 153 + 27 | 153 + 28 | 153 + 26 | 0.919 |
| Diastolic blood pressure just before rotational atherectomy (mmHg) | 75 + 14 | 76 + 15 | 75 + 13 | 0.584 |
| Heart rate just before rotational atherectomy (per minute) | 71 + 14 | 71 + 12 | 72 + 15 | 0.657 |
| Final procedure | 0.441 | |||
| Rotational atherectomy + balloon including drug-coating balloon—n, (%) | 23 (8.1) | 15 (10.0) | 8 (6.0) | |
| Rotational atherectomy + bare-metal stent—n, (%) | 3 (1.1) | 2 (1.3) | 1 (0.7) | |
| Rotational atherectomy + drug-eluting stent—n, (%) | 257 (90.5) | 133 (88.7) | 124 (92.5) | |
| Rotational atherectomy + covered stent for perforation—n, (%) | 1 (0.4) | 0 (0) | 1 (0.7) | |
Data are expressed as the mean ± SD or number (percentage). A Mann–Whitney U test was used for continuous variables, and a Fischer’s exact test was used for categorical variables.
GFR glomerular filtration rate.