Table 4 Definitions of the variables analysed in table 3 (eg. Measurements, Diameters, lengths between various aortic branches)

Measurement 2

from the jugular notch to the anterior superior iliac spine

LSA-Renal

from the left subclavian take off to the renal artery

Measurement 3

from the middle point between the jugular

notch and the sternal angle to the

trans-pyloric plane

LSA-Bifur

from the left subclavian take off

to the aortic bifurcation

Measurement 4

from the middle point between the jugular notch and the sternal angle to the anterior superior iliac spine.

LSA-Inser

from the left subclavian artery take off to the IAB insertion 2 cm below the mid-inguinal ligament

Measurement 5

from the jugular notch to the middle point in the line between the anterior superior iliac spine and symphysis pubis

Depth

the depth of the femoral artery from the surface of the skin, 2 cm below the mid-inguinal ligament

Dthorax

Aortic diameter (at the middle of the thorax)

Drenal

Aortic diameter (at a renal level)

Dbifurc

Aortic diameter (bifurcation level)