Key result
The small saphenous vein demonstrated much higher stiffness and less viscous behavior compared to the internal thoracic artery, especially in the radial direction.
The small saphenous vein exhibits higher stiffness and less viscous behavior compared to the internal thoracic artery, which may have implications for its use as a bypass graft.
SSV-ITA viscoelastic differences should not alter conduit selection; leaves open effects on graft durability and tissue-engineered scaffolds.
Internal thoracic artery (ITA) and small saphenous vein (SSV) are two viable conduits for coronary artery bypass grafts.The aim of this study was to investigate the viscoelastic behavior of the small saphenous vein and internal thoracic artery under compressive and tensile loadings at body temperature.The dynamic mechanical analysis was used to measure the viscoelastic properties of the ITA and SSV at both the desired temperature and load frequency range.Storage modulus, loss modulus as well as phase angle of both the blood vessels were measured at the temperature of 37 Æ 1 C and under a sinusoidal load with the frequency range of 1e2 Hz.The mean storage and loss modulus of the SSV were both higher than that of the ITA.Furthermore, the SSV showed a higher stiffness and internal friction compared to those values under the tensile load.While ITA was stiffer under the tensile load, no considerable difference was observed among the compressive and tensile loss modulus.A more intense viscous behavior was observed under the radial direction.The results also revealed that the SSV has much higher stiffness whereas less viscous behavior compared to the ITA, especially in the radial direction.The results may have implications not only for understanding of the viscoelastic time-dependent mechanical behavior of the ITA and SSV but also for tissue
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Khosravi et al. (2017) studied Healthy blood vessels (n=2). Small saphenous vein vs. Internal thoracic artery was evaluated on Storage modulus in compression (radial direction) at 37°C (MPa). The small saphenous vein demonstrated much higher stiffness and less viscous behavior compared to the internal thoracic artery, especially in the radial direction.
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