Table 2.
Angiographic and IVUS Findings
| Variable | n=100 |
|---|---|
| QCA results at MB segment | |
| RVD (D), mm | 2.28±0.57 (1.33–4.32) |
| RVD (S), mm | 2.40±0.50 (0.93–4.71) |
| MLD (D), mm | 1.66±0.37 (0.95–3.23) |
| MLD (S), mm | 1.37±0.42 (0.01–2.48) |
| %DS (D), % | 25.7±13.0 (0.00–58.89) |
| %DS (S), % | 42.0±17.8 (3.77–99.78) |
| IVUS results | |
| Bridge length, mm | 21.6±13.4 (4.7–76.9) |
| Arterial compression, % | 22.9±12.1 (0.4–50.7) |
| EEM CSA (D), mm2 | 7.0±2.8 (2.8–15.1) |
| EEM CSA (S), mm2 | 5.4±2.4 (2.1–12.7) |
| Halo thickness, mm | 0.66±0.58 (0.11–3.17) |
| Distance from LAD ostium, mm | 37.7±12.7 (5.3–77.5) |
| Presence of branches within MB, n (%) | 81 (81.0) |
| Max PBProx, % | 38.6±15.1 (11.3–76.9) |
| Max PBMB, % | 21.7±7.0 (10.1–45.3) |
| Plaque type (fibrous/soft/calcified/mixed), % | 49/33/10/8 |
Continuous variables are expressed as mean±SD (range). %DS indicates percentage diameter stenosis; CSA, cross‐sectional area; D, diastole; EEM, external elastic membrane; IVUS, intravascular ultrasound; LAD, left anterior descending artery; Max PBMB, maximum plaque burden with the myocardial bridge segment; Max PBProx, maximum plaque burden within a 20‐mm segment immediately proximal to the myocardial bridge entrance; MB, myocardial bridge; MLD, minimum lumen diameter; QCA, quantitative coronary angiography; RVD, reference vessel diameter; S, systole.