Ultrasound assessment of tensile stress in carotid arteries of healthy human subjects with varying age

BMC Medical Imaging

Table 2 Comparison of carotid viscoelasticity, structure and tensile stress between groups

Variable	Group A (n = 23)	Group B (n = 22)	t	P
Viscoelasticity
SWE_R kPa	10.29 ± 9.57	17.24 ± 14.07	−2.236	0.040
SWD_R (m/s)/kHz	11.99 ± 3.51	13.97 ± 3.71	−2.129	0.043
Structure
R-CIMT (μm)	677.6 ± 138.4	449.1 ± 131.9	6.321	<0.001
L-CIMT (μm)	674.7 ± 119.8	503.9 ± 193.2	3.976	<0.001
R-CCID_T (mm)	8.23 ± 0.89	6.43 ± 0.40	5.946	<0.001
L-CCID_T (mm)	7.93 ± 0.99	6.50 ± 0.41	7.575	<0.001
R-CCID_R (mm)	8.57 ± 1.03	7.00 ± 0.55	7.095	<0.001
L-CCID_R (mm)	8.20 ± 1.09	7.04 ± 0.56	5.000	<0.001
R-CCAD (μm)	339.9 ± 142.7	571.1 ± 148.2	−5.946	<0.001
L-CCAD (μm)	273.6 ± 98.6	535.4 ± 153.9	−7.575	<0.001
Tensile stress
R-PTS (mmHg)	920.4 ± 160.3	1073.6 ± 285.8	−2.474	0.017
R-MTS (mmHg)	783.8 ± 189.9	884.4 ± 224.0	−1.812	0.076
L-PTS (mmHg)	648.1 ± 117.4	723.8 ± 195.5	−1.758	0.084
L-MTS (mmHg)	600.9 ± 108.2	644.6 ± 168.2	−1.156	0.253

SWE_R Shear wave elastic modulus in electrocardiographic R wave, SWD_R Shear wave dispersion in electrocardiographic R wave, L-CIMT Left common carotid intima-media thickness, R-CIMT Right common carotid intima-media thickness; L-CCID_T and R-CCID_T Left and right common carotid inners at end of diastole, respectively, L-CCID_R and R-CCID_R Left and right common carotid inner diameters at end of systole, respectively, L-CCAD and R-CCAD Difference of CCID between diastole and systole on left and right, R-PTS and R-MTS Right carotid peak tensile stress and mean tensile stress, L-PTS and L-MTS Left carotid peak tensile stress and mean tensile stress
1 dyne/cm² = 7.5 × 10⁻⁴ mmHg

ISSN: 1471-2342