Abstract:

BACKGROUND: Stress relaxation is an important the viscoelastic indicator of the inferior vena cava, and relevant studies have not been reported yet.
OBJECTIVE: To compare the stress relaxation properties of the inferior vena cava between the normal animals and the aged models of deep vein thrombosis.
METHODS: A total of 20 samples of the two groups underwent stress relaxation test on the AG-10TA universal material testing machine. Strain acceleration was 1%/s. The duration of the test was 7 200 seconds. Total 100 data were collected and analyzed. Regression analysis was applied to process data.
RESULTS AND CONCLUSION: The stress relaxation at 7 200 seconds was 0.026 8 MPa and 0.023 MPa, respectively, in the normal control group and model group. There was a significant difference between the two groups (P < 0.05). The stress relaxation curve followed the logarithmic relationship. The stress relaxation changed best within the first 600 seconds, then decreased gradually and reached the basic level at 7 200 seconds. The stress relaxation properties were affected in the aged animals of inferior vena cava thrombosis, and deep vein thrombosis had a certain effect on the stress relaxation properties of the inferior vena cava.