The Ratio of the Size of the Abdominal Aortic Aneurysm to That of the Unchanged Aorta as a Risk Factor for Its Rupture

Figure 1. An example of computed tomography of patient with infrarenal abdominal aortic aneurysm with present neck segment.

Figure 2. A comparison of aorta diameter (D RENAL) and renal ratio (R RENAL) between women (F) and men (M). D Renal for women from 1.4 to 3.5 cm with majority from 2.1 to 2.6 cm, D Renal for men from 1.1 to 4.7 cm with majority from 2.2 to 2.7 cm. R Renal for women from 0.2 to 0.6 with majority from 0.3 to 0.45, R renal for men from 0.14 to 0.88 with majority form 0.32 to 0.45. All differences insignificant p > 0.05.

Figure 3. On the left, a comparison of diameters of the aorta at different levels and AAA diameters between ruptured and unruptured aneurysms in the whole cohort. Diameters in cm. Boxplots are shown in pairs. The left one is diameter for ruptured, the right one is diameter for unruptured aneurysms. Only D MAX difference is significant with p < 0.05. On the right, a comparison of ratios between ruptured and unruptured aneurysms. Boxplots are shown in pairs. The left one is ratio for ruptured, the right one is ratio for unruptured aneurysms. All differences significant at p < 0.05.

Figure 4. On the left, a comparison of diameters of the aorta between ruptured and unruptured aneurysms with the neck segment present. Diameters in cm. Boxplots are shown in pairs. The left one is diameter for ruptured, the right one is diameter for unruptured aneurysms. Only D MAX difference is significant with p < 0.05. On the right, a comparison of ratios between ruptured and unruptured aneurysms. Boxplots are shown in pairs. The left one is ratio for ruptured, the right one is ratio for unruptured aneurysms. All differences significant at p < 0.05.

Figure 5. On the left, a comparison of diameters of the aorta between ruptured and unruptured aneurysms with the neck segment absent. Diameters in cm. Boxplots are shown in pairs. The left one is diameter for ruptured, the right one is diameter for unruptured aneurysms. Only D MAX difference is significant with p < 0.05. On the right, a comparison of ratios between ruptured and unruptured aneurysms. Boxplots are shown in pairs. The left one is ratio for ruptured, the right one is ratio for unruptured aneurysms. All differences significant at p < 0.05.

Figure 6. (A) A comparison of ratios of the aorta between ruptured and unruptured aneurysms with the neck segment present. Subgroup with D MAX < 5 cm. Boxplots are shown in pairs. The left one is ratio for ruptured, the right one is ratio for unruptured aneurysms. Only the R NECK difference is significant with p < 0.05. (B) A comparison of ratios of the aorta between ruptured and unruptured aneurysms with the neck segment present. Subgroup with D MAX 5–6.5 cm. Boxplots are shown in pairs. The left one is ratio for ruptured, the right one is ratio for unruptured aneurysms. All differences significant at p < 0.05. (C) A comparison of ratios of the aorta between ruptured and unruptured aneurysms with the neck segment present. Subgroup with D MAX > 6.5 cm. Boxplots are shown in pairs. The left one is ratio for ruptured, the right one is ratio for unruptured aneurysms. Only the R NECK difference is significant with p < 0.05.

Figure 7. (A) ROC curves for the predictive value of R NECK compared with D MAX and the reference line in the group of aneurysms with D MAX < 5 cm. AUC for D MAX: 0.65, AUC for R NECK: 0.783. (B) ROC curves for the predictive value of R NECK compared with D MAX and the reference line in the group of aneurysms with D MAX 5–6.5 cm. AUC for D MAX: 0.729, AUC for R NECK: 0.68. (C) ROC curves for the predictive value of R NECK compared with D MAX and the reference line in the group of aneurysms with D MAX > 5 cm. AUC for D MAX: 0.658, AUC for R NECK: 0.641.

Figure 8. (A) R NECK values distribution in a certain number of patients with ruptured aneurysm. For the 20th percentile: 2.27, 25th percentile: 2.32, 30th percentile: 2.42. (B) R NECK values distribution in a certain number of patients with unruptured aneurysm. For the 20th percentile: 1.92, 25th percentile: 1.96, 30th percentile: 2.04.

Figure 9. (A) R RENAL values distribution in a certain number of patients with ruptured aneurysm with neck segment present. For the 20th percentile: 2.41, 25th percentile: 2.45, 30th percentile: 2.5. (B) R RENAL values distribution in a certain number of patients with unruptured aneurysm with neck segment present. For the 20th percentile: 2, 25th percentile: 2.08, 30th percentile: 2.17.

Figure 10. (A) R RENAL values distribution in a certain number of patients with ruptured aneurysm with neck segment absent. For the 20th percentile: 2.78, 25th percentile: 3, 30th percentile: 3. (B) R RENAL values distribution in a certain number of patients with unruptured aneurysm with neck segment absent. For the 20th percentile: 1.82, 25th percentile: 1.91, 30th percentile: 2.