Table 3.
IVUS characteristics according to QFR groups.
| Low QFR | High QFR | p-value | |
|---|---|---|---|
| Grayscale IVUS lesions (n = 49) | |||
| Lesion No. | 26 | 23 | – |
| Grayscale IVUS findings | |||
| EEM CSA, mm2 | 12.3 (10.6–14.7) | 12.4 (10.8–16.1) | 0.515 |
| Plaque + media, mm2 | 8.9 (7.5–10.7) | 8.7 (7.0–10.3) | 0.771 |
| Plaque burden, % | 73.2 (68.0–77.7) | 66.5 (64.0–72.9) | 0.036 |
| MLA, mm2 | 3.5 (2.8–4.1) | 4.1 (3.4–4.9) | 0.025 |
| Reference EEM CSA, mm2 | 13.1 (11.2–14.5) | 13.0 (10.3–17.0) | 0.528 |
| Remodeling index | 0.96 (0.80–1.10) | 0.92 (0.81–1.08) | 0.787 |
| Positive remodeling | 11 (42.3) | 7 (30.4) | 0.390 |
| Negative remodeling | 13 (50.0) | 13 (56.5) | 0.648 |
| VH-IVUS lesions (n = 40) | |||
| Lesion No. | 20 | 20 | – |
| VH-IVUS findings | |||
| Fibrous tissue, mm2 | 2.7 (2.0–4.5) | 2.7 (1.8–4.0) | 0.678 |
| Fibrous tissue, % | 62.9 (52.9–69.5) | 56.2 (45.0–62.8) | 0.134 |
| Fibrofatty tissue, mm2 | 1.0 (0.6–1.8) | 1.8 (0.6–2.5) | 0.121 |
| Fibrofatty tissue, % | 16.6 (11.7–28.5) | 22.7 (17.9–46.8) | 0.142 |
| Necrotic core, mm2 | 0.7 (0.3–1.2) | 0.4 (0.2–1.2) | 0.478 |
| Necrotic core, % | 12.2 (7.0–20.8) | 9.7 (2.3–21.1) | 0.398 |
| Dense calcium, mm2 | 0.2 (0.0–0.4) | 0.1 (0.0–0.2) | 0.398 |
| Dense calcium, % | 3.3 (0.1–7.1) | 1.1 (0.0–6.5) | 0.565 |
| VH-TCFA | 3 (15.0) | 3 (15.0) | 1.000 |