Table 2.
Comparison of clinical characteristics and anatomical features of MB between patients with normal and abnormal FAI (≥ − 70.1) in the MB group.
| Variables | FAI < − 70.1 (n = 145) | FAI ≥ − 70.1 (n = 10) | P |
|---|---|---|---|
| Patients | |||
| Age (y) | 51.7 ± 10.5 | 49.1 ± 10.7 | 0.440 |
| Male (n, %) | 77 (53.1) | 5 (50) | 1.000 |
| BMI | 24.6 ± 3.3 | 25.5 ± 4.6 | 0.876 |
| Risk factors | |||
| Hypertension (n, %) | 32 (22.1) | 4 (40.0) | 0.362 |
| Hyperlipidemia (n, %) | 14 (9.7) | 2 (20.0) | 0.275 |
| Diabetes (n, %) | 14 (9.7) | 1 (10.0) | 1.000 |
| Smoking (n, %) | 24 (16.6) | 3 (30.0) | 0.380 |
| Symptoms | |||
| Angina pectoris (n, %) | 12 (8.3) | 1 (10.0) | 0.595 |
| Atypical angina (n, %) | 9 (6.2) | 1 (10.0) | 0.497 |
| Chest tightness and pain (n, %) | 13 (9.0) | 1 (10.0) | 1.000 |
| None (n, %) | 111 (76.6) | 7 (70.0) | 0.703 |
| MB | |||
| Length (mm) | 24.1 ± 11.4 | 29.9 ± 10.6 | 0.080 |
| Depth (mm) | 2.0 ± 1.3 | 2.4 ± 1.4 | 0.244 |
| Location (mm) | 37.6 ± 12.1 | 31.2 ± 6.8 | 0.111 |
| Systolic compression index | 0.09 ± 0.13 | 0.11 ± 0.09 | 0.798 |
| MBMI | 53.3 ± 48.0 | 78.6 ± 63.7 | 0.098 |
| MB stenosis rate in diastole | 0.31 ± 0.13 | 0.36 ± 0.17 | 0.170 |
| MB stenosis rate in systole | 0.32 ± 0.18 | 0.35 ± 0.16 | 0.585 |
MB myocardial bridging, FAI fat attenuation index, BMI body mass index, MBMI MB muscle index.