Table 3 Comparison of 25 hemodynamic parameters between unruptured (n = 101) and ruptured (n = 40) sias.

From: Predictive modeling and machine learning show poor performance of clinical, morphological, and hemodynamic parameters for small intracranial aneurysm rupture

Hemodynamic parameters

Unit

Unruptured (n = 101)

Ruptured (n = 40)

p-value

Maximum WSS

Pa

71.55 (± 62.39)

85.23 (± 53.47)

0.2

Mean WSS

Pa

8.00 (± 6.82)

10.09 (± 7.65)

0.05

Minimum WSS

Pa

3.47E−01 (± 0.71)

2.71E−01 (± 0.37)

0.5

Normalized WSS

–

7.41E−01 (± 0.49)

7.34E−01 (± 0.46)

0.9

Mean WSS of parent artery

Pa

11.89 (± 10.74)

15.59 (± 11.19)

0.04

Flow rate of parent artery

Kg/m3

2.63E−03 (± 1.57E−03)

2.99E−03 (± 1.69E−03)

0.2

Neck inflow rate

Kg/m3

6.45E−04 (± 5.42E−04)

8.70E−04 (± 6.28E−04)

0.03

Inflow concentration index

–

6.73E−01 (± 0.51)

7.12E−01 (± 0.42)

0.7

Maximum oscillatory shear index

–

3.88E−01 (± 0.12)

4.06E−01 (± 0.09)

0.3

Mean oscillatory shear index

–

1.69E−02 (± 0.02)

1.74E−02 (± 0.02)

0.9

Maximum velocity

m/s

6.33E−01 (± 0.32)

7.38E−01 (± 0.29)

0.03

Mean velocity

m/s

2.21E−01 (± 0.14)

2.66E−01 (± 0.15)

0.06

Pulsatility index of velocity

–

1.65 (± 0.38)

1.55 (± 0.27)

0.08

Pulsatility index of neck inflow rate

–

1.38 (± 0.27)

1.31 (± 0.20)

0.03

Pulsatility index of WSS

–

2.38 (± 0.42)

2.29 (± 0.31)

0.1

Kinetic energy

µJ

5.49E−01 (± 8.64E−01)

8.51E−01 (± 9.59E−01)

0.06

Kinetic energy of parent artery

µJ

2.13E−00 (± 1.97E−00)

2.84E−00 (± 2.28E−00)

0.01

Kinetic energy ratio

–

3.46E−01 (± 0.45)

3.80E−01 (± 0.34)

0.9

High shear area

–

1.35E−01 (± 0.16)

1.38E−01 (± 0.17)

0.8

Low shear area 1*

–

5.13E−01 (± 0.3)

5.05E−01 (± 0.3)

0.7

Low shear area 2*

–

1.52E−01 (± 0.25)

1.20E−01 (± 0.21)

0.6

Low shear area 3*

–

7.74E−02 (± 0.17)

9.95E−02 (± 0.21)

0.4

Shear concentration index

–

3.94 (± 3.57)

3.12 (± 2.06)

0.2

Low shear index

–

2.28E−01 (± 0.25)

2.30E−01 (± 0.28)

0.7

High shear index

–

7.25E−02 (± 0.13)

7.36E−02 (± 0.13)

0.7

  1. The table presents the mean values and standard deviations (± σ) for each of the analyzed hemodynamic parameters. *Low shear area follows three different definitions: (1) aneurysm area with WSS less than one standard deviation below the mean WSS of the parent artery divided by the total aneurysm area, (2) aneurysm area with WSS less 1.5 pa divided by the total aneurysm area and (3) aneurysm area with WSS less 10% of the mean WSS of the parent artery divided by the total aneurysm area.
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