There were no technical errors during the non-invasive in vivo human studies or the in vitro data acquisition studies. The hemodynamic parameters obtained during the non-invasive studies in normotensive subjects and in the in vitro experiments are shown in Table 1. Isobaric pulsatile values were similar among Groups I, II, III, and IV (P > 0.05). Systolic, diastolic, and mean pressure values showed similar behavior. The mean internal diameter values of the ePTFE conduits (Group IV) were the lowest. See Table 1. The in vitro studies showed that the E and η values obtained in cryopreserved human carotid arteries were similar to the values obtained non-invasively for the same vessel-type in normotensive subjects (P > 0.05), and similar to the in vitro values in fresh human vessels (P > 0.05). See Table 2. The values of E for the in vitro ePTFE conduits were significantly higher than the observed values in Groups I, II, and III (P η in the ePTFE conduits were the lowest (P Table 2. The stiffness index showed similar values in Groups I, II, and III; conversely the index was highest in the ePTFE group (P Table 3. The pulse wave velocity and the Peterson modulus obtained in Groups I, II, and III were similar to each other. On the other hand, the pulse wave velocity and the Peterson modulus obtained with ePTFE segments (Group IV) were significantly higher than the values observed in Groups I, II, and III (P Table 3.
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