Table 1 Severity parameters for AAA rupture
From: Analysis and computer program for rupture-risk prediction of abdominal aortic aneurysms
BF i | Definition | Reported ranges of biomechanical factors (BF i ) | Weighing coefficients w i | References for BF i -ranges | |||
|---|---|---|---|---|---|---|---|
| Â | Â | Low risk | Middle risk | High risk | Danger zone | Â | Â |
i = 1: Diameter ratio |
| 1.5~1.9 | 2.0~2.4 | 2.5~3.2 | ≥3.3 | 0.20 | Cappeller [6] |
i = 2: Expansion rate (per year) |
| 0.01~0.04 | 0.05~0.09 | 0.10~0.17 | ≥0.18 | 0.25 | Limet [2] |
i = 3: Stress ratio |
| 1.5~2.0 | 2.1~3.0 | 3.1~4.3 | ≥4.4 | 0.15 | Fillinger [4] |
i = 4: Diastolic pressure ratio |
| 0.83~0.9 | 0.91~1.0 | 1.1~1.16 | ≥1.17 | 0.12 | Cronenwett [20] |
i = 5: Asymmetry index |
| 1~0.9 | 0.7~0.8 | 0.5~0.6 | ≤0.4 | 0.07 | Vorp [36] |
i = 6: ILT-AAA ratio |
| 0.1~0.24 | 0.25~0.44 | 0.45~0.61 | ≥0.62 | 0.07 | Cappeller [6] |
i = 7: Stiffness decrease (per year) |
| 0.01~0.03 | 0.04~0.06 | 0.07~0.09 | ≥0.1 | 0.07 | Wilson [23] |
i = 8: Saccular index |
| ≥0.71 | 0.66~0.70 | 0.61~0.65 | ≤0.6 | 0.07 | Ouriel [41] |
Assigned BF i threshold values | 0.1 | 0.3 | 0.7 | 1.0 | Â | Â | |
