Abstract-Segmentsof 45 human thoracic and 20 abdominal aortas, including 13 pairs, aged 30-88 yr at autopsy. were perfused with 37 C Tyrode's solution at in-sifcd length. Diameter changes due to 20 mmHp pressure steps, between 20 and I80 mmHg. were measured to I pm accuracy with balanced transducers.
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