Distensibility

Distensibility is a metric of the stiffness of blood vessels. It is defined as

$D={\frac {d_{sys}-d_{dias}}{(p_{sys}-p_{dias})d_{dias}}}$ ,

where $d_{sys}$ and $d_{dias}$ are the diameter of the vessel in systole and diastole, and $p_{sys}$ and $p_{dias}$ are the systolic and diastolic blood pressure.[1]

References

Roccabianca, S.; Figueroa, C. A.; Tellides, G.; Humphrey, J. D. (2014-01-01). "Quantification of regional differences in aortic stiffness in the aging human". Journal of the Mechanical Behavior of Biomedical Materials. 29: 618–634. doi:10.1016/j.jmbbm.2013.01.026. ISSN 1751-6161. PMC 3842391. PMID 23499251.

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[1] Roccabianca, S.; Figueroa, C. A.; Tellides, G.; Humphrey, J. D. (2014-01-01). "Quantification of regional differences in aortic stiffness in the aging human". Journal of the Mechanical Behavior of Biomedical Materials. 29: 618–634. doi:10.1016/j.jmbbm.2013.01.026. ISSN 1751-6161. PMC 3842391. PMID 23499251.