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The pressure dependent dynamic elasticity of 35 thoracic and 16 abdominal human aortas in vitro described by a five component model






Journal of Biomechanics 18(8): 613-620

The pressure dependent dynamic elasticity of 35 thoracic and 16 abdominal human aortas in vitro described by a five component model

Segments of 35 thoracic and 16 abdominal human aortas, including nine pairs, aged 30-78 yr at autopsy, were perfused with 37.degree. C Tyrode's solution at in situ length. Diameter changes due to 20 mmHg pressure steps between 20 and 180 mmHg were measured to 1 .mu.m accuracy at an equivalent noise level of 0.1 .mu.m RMS, using balanced transducers. Aortic creep curves at each pressure level were described individually by a constant plus bi-exponential creep model characterized by two creep fractions (.alpha.1 and .alpha.2) and two time constants (.tau.1 and .tau.2). Creep fractions and time constants increased substantially with the pressure level, indicating a significant effect of pressure or distension on aortic viscoelasticity. At 110 mmHg the mean .+-. 1 S.D., parameter values were: thoracic aorta: .alpha.1 = 0.076 .+-. 0.017, .alpha.2 = 0.102 .+-. 0.028 .tau.1 = 0.73 .+-. 0.29 s, .tau.2 = 14.0 .+-. 4.1 s; abdominal aorta: .alpha.1 = 0.078 .+-. 0.017, .alpha.2 = 0.101 .+-. 0.025, .tau.1 = 0.61 .+-. 0.12 s, .tau.2 = 12.1 .+-. 3.4 s. Nine paired comparisons at each pressure level showed that creep fractions and time constants of thoracic and abdominal segments were not significantly different (p = 0.05).

Accession: 006740057

PMID: 4055815

DOI: 10.1016/0021-9290(85)90015-6

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